JPH05124126A - Expanded synthetic resin molded product, its molding method and in-mold foam molding mold - Google Patents
Expanded synthetic resin molded product, its molding method and in-mold foam molding moldInfo
- Publication number
- JPH05124126A JPH05124126A JP4116802A JP11680292A JPH05124126A JP H05124126 A JPH05124126 A JP H05124126A JP 4116802 A JP4116802 A JP 4116802A JP 11680292 A JP11680292 A JP 11680292A JP H05124126 A JPH05124126 A JP H05124126A
- Authority
- JP
- Japan
- Prior art keywords
- raw material
- material particles
- molding
- synthetic resin
- mold
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Landscapes
- Laminated Bodies (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
- Molding Of Porous Articles (AREA)
Abstract
(57)【要約】
【目的】 通常の発泡成形操作を大きく変更することな
く、型内発泡成形過程で発泡合成樹脂成形品表面の一部
又は全面に連続した表面硬化層を均一に、しかも所望の
厚みに形成するのを可能とすることを目的とする。
【構成】 型内発泡成形用金型の成形面における発泡性
合成樹脂原料粒子の融点以上に加熱した部分に対応した
成形品１表面に、この成形面の加熱した部分に原料粒子
を接触させて溶融させ、その部分に溶融樹脂層を形成し
た後、この溶融樹脂層を硬化させて連続した表面硬化層
２を型内発泡成形過程で形成した発泡合成樹脂成形品を
構成とする。
(57) [Abstract] [Purpose] A uniform surface hardening layer is desired on a part or the entire surface of the foamed synthetic resin molded product during the in-mold foam molding process, without any major changes to the normal foam molding operation. The purpose is to enable formation to a thickness of. [Structure] The raw material particles are brought into contact with the surface of the molded article 1 corresponding to the portion of the molding surface of the in-mold foam molding die that is heated above the melting point of the expandable synthetic resin raw material particles. After melting and forming a molten resin layer on that portion, this molten resin layer is cured to form a foamed synthetic resin molded article in which a continuous surface-hardened layer 2 is formed in the in-mold foam molding process.
Description
【０００１】[0001]
【産業上の利用分野】本発明は、一対の金型から構成さ
れる型内発泡成形用金型内に発泡性合成樹脂原料粒子を
充填し、発泡融着させて成形される通常の発泡合成樹脂
成形品の用途や使用状態によっては欠点を改善するため
になされたもので、こうした改善された発泡合成樹脂成
形品、その成形方法並びに型内発泡成形用金型に関す
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ordinary foam synthesis in which foamable synthetic resin raw material particles are filled in a mold for in-mold foam molding, which is composed of a pair of molds, and foamed and fused. The present invention has been made in order to improve the defects depending on the application and use condition of the resin molded product, and relates to the improved foam synthetic resin molded product, its molding method and in-mold foam molding die.
【０００２】[0002]
【従来の技術】一対の金型から構成される型内発泡成形
用金型内に発泡性合成樹脂原料粒子を充填し、発泡融着
させて成形される通常の発泡合成樹脂成形品は、軽量で
取扱いやすく、しかも緩衝性能が良好なことから、各種
緩衝材、収容箱等に広く用いられている。2. Description of the Related Art An ordinary foamed synthetic resin molded article, which is formed by filling foamable synthetic resin raw material particles into a mold for in-mold foam molding, which is composed of a pair of molds, and foamed and fused, is lightweight. It is widely used in various cushioning materials, storage boxes, etc. because it is easy to handle and has good cushioning performance.
【０００３】しかし、このような通常の発泡合成樹脂成
形品は、ごく薄膜状な表皮を持った原料粒子を発泡融着
させて成形されている関係上、表面には個々の原料粒子
のごく薄膜状な表皮が亀甲状に連なった被膜が形成され
ているだけで、連続した厚みのある被膜を有していない
から、表面強度が高いものとは言えない。このため、用
途によって、又は繰返し使用したり、水洗い使用する場
合には不向きである。又、表面に他の物が擦れたり、当
たったときには、簡単に剥離現象や陥没現象が発生する
問題がある。更に、表面に個々の原料粒子が亀甲状膜様
として現れたり、表面の発泡融着した原料粒子間には凹
みが形成されるから、表面が必ずしも美麗な状態のもの
とは言えない問題もある。However, since such a general foamed synthetic resin molded article is formed by foaming and fusing raw material particles having a very thin film skin, the surface of each raw material particle is a very thin film. The surface strength cannot be said to be high because only a film in which the skin-like epidermis is continuous is formed and the film does not have a continuous and thick film. For this reason, it is unsuitable depending on the intended use, repeated use or washing with water. Further, when another object rubs or hits the surface, there is a problem that a peeling phenomenon or a depression phenomenon easily occurs. Furthermore, there is also a problem that the surface is not always in a beautiful state because individual raw material particles appear like a hexagonal film on the surface and dents are formed between the raw material particles that have been foamed and fused on the surface. .
【０００４】このような通常の発泡合成樹脂成形品のこ
れら用途や使用状態によっては欠点を改善することを目
的として、従来、成形品の成形後、後加工で、この表面
に非発泡体の合成樹脂フィルムを重合させた後、加熱し
て添着させたり、又は表面に接着剤を介在させて非発泡
体の合成樹脂フィルムを添着させたり、又後加工で、表
面を加熱して溶融させたりすることで、表面被膜を形成
することが試みられている。別に、成形品の成形後、真
空成形品を添着させて表面被膜を形成することも行われ
ている。For the purpose of ameliorating the drawbacks of such ordinary foamed synthetic resin molded articles depending on these applications and usage conditions, conventionally, a non-foamed body is synthesized on the surface by post-processing after molding the molded article. After polymerizing the resin film, heat it to attach it, or attach a non-foamed synthetic resin film with an adhesive on the surface, or heat the surface to melt it in post processing. Thus, it has been attempted to form a surface coating. Separately, after forming a molded product, a vacuum-molded product is attached to form a surface coating.
【０００５】又、型開きした一対の金型間に非発泡体の
合成樹脂シートを挿入した後、一対の金型を型閉めし
て、その内部に発泡性合成樹脂原料粒子を充填し、通常
の発泡成形を行い、型内発泡成形過程で成形品表面に合
成樹脂シートから表面被膜を形成することも試みられて
いる。Further, after inserting a non-foamed synthetic resin sheet between a pair of molds opened, the pair of molds are closed and the inside thereof is filled with foamable synthetic resin raw material particles. It has also been attempted to form a surface coating from a synthetic resin sheet on the surface of the molded product by performing the foam molding of (1) and in-mold foam molding.
【０００６】更に、通常の発泡合成樹脂成形品のこれら
用途や使用状態によっては欠点を改善することを目的と
した先行文献、例えばフランス特許第１５７１２７４号
公報や特開昭５８−１７１９２４号公報には、次に示さ
れる方法が提案されている。先ず、フランス特許第１５
７１２７４号公報には、型内発泡成形用金型内に充填し
た発泡性ポリスチレン系樹脂原料粒子に、５〜１０ｋｇ
／ｃｍ2 の相対圧力の蒸気を用いて、２〜５ｋｇ／ｃｍ
2 の相対圧力（１４０〜１５０℃の加熱状態に相当す
る。）を１０秒間負荷させ、その後直ちに０〜１．５ｋ
ｇ／ｃｍ2 の相対応力（１０５〜１１０℃の加熱状態に
相当する。）に下げ、この状態を維持させて発泡成形を
行う方法が開示されている。そして、この方法によれ
ば、表面側が内部側より密度が１０〜２０倍高い成形品
を成形できるというものである。次に、特開昭５８−１
７１９２４号公報には、型内発泡成形用金型内に発泡性
ポリプロピレン系樹脂原料粒子を充填して、通常の発泡
成形を行い、この後引続いて成形用金型内でそのまま成
形品表面を約２００℃で３０秒間加熱して溶融させるこ
とで、表面被膜を形成する方法が開示されている。[0006] Further, according to the prior arts aiming at improving the defects depending on these uses and use conditions of ordinary foamed synthetic resin molded articles, for example, French Patent No. 1571274 and Japanese Patent Laid-Open No. 58-171924 are disclosed. , The following method has been proposed. First, French Patent No. 15
No. 71274 discloses 5 to 10 kg of expandable polystyrene resin raw material particles filled in a mold for in-mold foam molding.
2-5 kg / cm 2 with steam at a relative pressure of / cm 2
A relative pressure of 2 (corresponding to a heating state of 140 to 150 ° C.) is applied for 10 seconds, and then 0 to 1.5 k immediately.
A method is disclosed in which the relative stress is reduced to g / cm 2 (corresponding to a heated state of 105 to 110 ° C.) and this state is maintained to perform foam molding. According to this method, it is possible to mold a molded product whose surface side is 10 to 20 times higher in density than the inner side. Next, JP-A-58-1
No. 71924 discloses that in-mold foam molding mold is filled with expandable polypropylene resin raw material particles and ordinary foam molding is carried out, and subsequently, the surface of the molded product is directly kept in the molding mold. A method of forming a surface coating by heating and melting at about 200 ° C. for 30 seconds is disclosed.
【０００７】[0007]
【発明が解決しようとする課題】ところが、発泡合成樹
脂成形品の型内発泡成形用金型内での成形後、後加工
で、非発泡体の合成樹脂フィルムを添着させる場合、合
成樹脂フィルムにしわを生じることなく、作業をするの
はきわめて困難である。特に、成形品の形状が複雑なと
き、こうした傾向が顕著である。又、成形後、後加工
で、表面を加熱して溶融させることで、表面被膜を形成
する場合、原料粒子を均一に溶融させるのが困難で、表
面が波打ち状態になる問題がある。そして、いずれの場
合、又真空成形品を添着させる場合でも、成形工程が二
工程になって、作業が複雑になる。However, when a non-foamed synthetic resin film is attached in a post-processing after molding in a mold for in-mold foam molding of a foamed synthetic resin molded article, the synthetic resin film is attached to the synthetic resin film. It is extremely difficult to work without wrinkles. In particular, this tendency is remarkable when the shape of the molded product is complicated. Further, when a surface coating is formed by heating and melting the surface in post-processing after molding, it is difficult to uniformly melt the raw material particles, and there is a problem that the surface becomes wavy. In any case, or in the case of attaching a vacuum-formed product, the forming process becomes two steps and the work becomes complicated.
【０００８】更に、型開きした一対の金型間に非発泡体
の合成樹脂シートを挿入する場合には、この挿入操作自
体が面倒で、しかもしわ等の発生により表面が美麗な状
態に仕上がらない問題が残る。そして、この場合も又、
成形品の形状、即ち金型の成形面の形状が複雑なとき、
こうした傾向が顕著になる。Further, when a non-foamed synthetic resin sheet is inserted between a pair of molds which have been opened, the inserting operation itself is troublesome and the surface is not finished beautiful due to the generation of wrinkles and the like. The problem remains. And in this case also
When the shape of the molded product, that is, the shape of the molding surface of the mold is complicated,
This tendency becomes remarkable.
【０００９】一方、フランス特許第１５７１２７４号公
報に示される方法でも、次に示す問題がある。この公報
には何ら記載されていないが、原料粒子の加熱温度が、
ポリスチレン系樹脂の融点とされる約２００℃より少な
くとも５０℃以上低いことから、表面側の原料粒子の溶
融現象は生じず、しかも原料粒子は原形をとどめたまま
と考えるのが相当である。このため、仮に表面側が内部
側より密度がかなり高くなっていたとしても、依然、表
面に個々の原料粒子が亀甲状模様として現れたり、表面
の発泡融着した原料粒子間に凹みが形成される点につい
て改善されていないと見るべきである。又、型内発泡成
形用金型の型閉め後の発泡圧だけを利用して、表面側に
内部側より密度が高い部分を形成するから、この密度の
高い部分の厚みを大きくするのに限界がある。更に、高
発泡倍率に予備発泡させた原料粒子を用いることができ
ず、通常の発泡合成樹脂成形品の軽量であるという特性
を損なうことにもなる。そして、成形用金型内に充填し
た原料粒子に、先ず高圧の蒸気を直接接触させた後、直
ちに低圧の蒸気を接触させるものであるから、発泡成形
操作が複雑になる。加えて、初めの高圧の蒸気と直接接
触させた段階で、表面側が直ちに硬化して、その後内部
側に蒸気が充分に通らないことがあり、高度な操作を必
要とする。On the other hand, the method disclosed in French Patent No. 1571274 has the following problems. Although nothing is described in this publication, the heating temperature of the raw material particles is
Since the melting point of the polystyrene-based resin is lower than about 200 ° C. by at least 50 ° C. or more, it is reasonable to consider that the raw material particles on the surface side do not melt and the raw material particles remain in their original shape. Therefore, even if the surface side has a considerably higher density than the inner side, individual raw material particles still appear as a hexagonal pattern on the surface, or dents are formed between the raw material particles that are foam-fused on the surface. It should be seen that the points have not been improved. Further, since only the foaming pressure of the mold for in-mold foam molding is used to form a part having a higher density on the surface side than the inner side, there is a limit to increasing the thickness of this high density part. There is. Further, since the raw material particles pre-expanded to a high expansion ratio cannot be used, the light-weight property of a general foamed synthetic resin molded product is impaired. Then, the high-pressure steam is first brought into direct contact with the raw material particles filled in the molding die, and then the low-pressure steam is immediately brought into contact, so that the foam molding operation becomes complicated. In addition, the surface side may be immediately hardened at the stage of direct contact with the high-pressure steam at the beginning, and then steam may not sufficiently pass through to the inside, which requires a high degree of operation.
【００１０】次に、特開昭５８−１７１９２４号公報に
示される方法では、発泡合成樹脂成形品の成形後、引続
いて型内発泡成形用金型内でそのまま成形品表面を融点
以上に加熱するから、発泡融着した原料粒子内に滞留す
る発泡融着過程で発泡剤の一部又は全体と置換した空気
が原因となり、表面被膜が形成されない部分が残って、
連続した表面被膜が均一に形成されなかったり、表面被
膜と背後の発泡融着した原料粒子の間に空隙が形成され
る問題がある。そして、この場合も又、表面被膜の厚み
を大きくするのに限界がある。Next, in the method disclosed in Japanese Patent Application Laid-Open No. 58-171924, after molding a foamed synthetic resin molded article, the molded article surface is subsequently heated in the mold for in-mold foaming molding as it is above the melting point. Therefore, due to the air replaced with a part or the whole of the foaming agent in the foaming and fusion process of staying in the foamed and fused raw material particles, a portion where the surface coating is not formed remains,
There are problems that a continuous surface coating is not formed uniformly, or voids are formed between the surface coating and the foamed and fused raw material particles behind. In this case, too, there is a limit in increasing the thickness of the surface coating.
【００１１】このような従来の問題点に鑑みて発明され
たのが本発明に係る発泡合成樹脂成形品、その成形方法
並びに型内発泡成形用金型で、特に通常の発泡成形操作
を大きく変更することなく、型内発泡成形過程で成形品
表面の一部又は全面に連続した表面硬化層を均一に、し
かも所望の厚みに形成するのを可能とすることを目的と
する。The foamed synthetic resin molded article, the molding method therefor, and the in-mold foam molding die according to the present invention have been devised in view of the above conventional problems, and in particular, the ordinary foam molding operation is largely changed. It is an object of the present invention to form a continuous surface-hardened layer on a part or the entire surface of a molded product uniformly and to a desired thickness in the in-mold foam molding process without performing the above.
【００１２】[0012]
【課題を解決するための手段】こうした目的を達成した
一例として、請求項１では、型内発泡成形用金型の成形
面における発泡性合成樹脂原料粒子の融点以上に加熱し
た部分に対応した成形品表面に、この成形面の加熱した
部分に原料粒子を接触させて溶融させ、その部分に溶融
樹脂層を形成した後、この溶融樹脂層を硬化させて連続
した表面硬化層を型内発泡成形過程で形成した発泡合成
樹脂成形品を構成した。別に、請求項２では、型内発泡
成形用金型の成形面における発泡性合成樹脂原料粒子の
融点以上に加熱した部分に対応した成形品表面に、この
成形面の加熱した部分に原料粒子を少なくとも一時期、
ここに成形用金型内に充填した原料粒子を強制的に押圧
しながら接触させて溶融させ、その部分に溶融樹脂層を
形成した後、この溶融樹脂層を硬化させて連続した表面
硬化層を型内発泡成形過程で形成した発泡合成樹脂成形
品を構成した。又、請求項３では、表面硬化層と背後の
発泡性合成樹脂原料粒子の境界部分で、表面硬化層の一
部を原料粒子の一部が溶融して形成し、表面硬化層と背
後の原料粒子が接着したことを例示した。更に、請求項
４では、表面硬化層の内部に、気泡が独立、分散した状
態で存在したことを例示した。そして、請求項５では、
請求項４において、多数の気泡が表面硬化層の厚み方向
に偏平になったことを例示した。又、請求項６では、発
泡性合成樹脂原料粒子が発泡性ポリスチレン系樹脂原料
粒子又は発泡性ポリオレフィン系樹脂原料粒子の中から
選択されたことを例示した。As an example of achieving such an object, in claim 1, molding corresponding to a portion heated on the molding surface of an in-mold foam molding die above the melting point of the expandable synthetic resin raw material particles. On the product surface, raw material particles are brought into contact with the heated part of the molding surface to melt it, form a molten resin layer on that part, and then cure this molten resin layer to form a continuous surface-hardened layer by in-mold foam molding. A foamed synthetic resin molded product formed in the process was constituted. Separately, in the second aspect, on the surface of the molded product corresponding to the portion of the molding surface of the mold for in-mold foam molding heated above the melting point of the expandable synthetic resin raw material particles, the raw material particles are added to the heated portion of this molding surface. At least for a while,
The raw material particles filled in the molding die here are forcibly pressed and brought into contact with each other to be melted, and a molten resin layer is formed at that portion, and then the molten resin layer is cured to form a continuous surface-hardened layer. A foamed synthetic resin molded article formed in the in-mold foam molding process was constructed. Further, according to claim 3, a part of the raw material particles is formed by melting a part of the raw material particles at a boundary portion between the surface hardened layer and the foamable synthetic resin raw material particles behind, and the surface hardened layer and the raw material behind It was illustrated that the particles adhered. Furthermore, claim 4 exemplifies that the air bubbles existed inside the surface-hardened layer in a dispersed state. And in claim 5,
Claim 4 exemplifies that many bubbles are flattened in the thickness direction of the surface-hardened layer. Further, in the sixth aspect, the expandable synthetic resin raw material particles are selected from the expandable polystyrene resin raw material particles or the expandable polyolefin resin raw material particles.
【００１３】次に、請求項７では、一対の金型から構成
される型内発泡成形用金型の成形面の一部又は全面をそ
の型閉めした内部に充填する発泡性合成樹脂原料粒子の
融点以上に加熱する工程と、一般的なクラッキング間隙
より大きな間隙を残して型閉めした一対の金型間に原料
粒子を充填する工程と、成形面の原料粒子の融点以上に
加熱した部分に原料粒子を接触させて溶融させ、この部
分に溶融樹脂層を形成する工程と、溶融樹脂層を硬化さ
せて成形品表面に対応する部分に連続した表面硬化層を
形成する工程よりなる型内発泡成形過程で成形品表面に
原料粒子から表面硬化層を形成することを特徴とした発
泡合成樹脂成形品の成形方法を要旨とする。別に、請求
項８では、一対の金型から構成される型内発泡成形用金
型の成形面の一部又は全面をその型閉めした内部に充填
する発泡性合成樹脂原料粒子の融点以上に加熱する工程
と、一般的なクラッキング間隙より大きな間隙を残して
型閉めした一対の金型間に原料粒子を充填する工程と、
成形面の原料粒子の融点以上に加熱した部分に原料粒子
を少なくとも一時期、ここに一対の金型間に充填した原
料粒子を強制的に押圧しながら接触させて溶融させ、こ
の部分に溶融樹脂層を形成する工程と、溶融樹脂層を硬
化させて成形品表面に対応する部分に連続した表面硬化
層を形成する工程よりなる型内発泡成形過程で成形品表
面に原料粒子から表面硬化層を形成することを特徴とし
た発泡合成樹脂成形品の成形方法を要旨とする。又、請
求項９では、成形面の一部又は全面を発泡性合成樹脂原
料粒子の融点以上に加熱する工程を他の工程に先立って
開始させ、この成形面の加熱した部分に溶融樹脂層を形
成する工程を一対の金型間に原料粒子を充填する工程と
同時に開始させることを例示している。そして、請求項
１０では、請求項９において、一対の金型間に発泡性合
成樹脂原料粒子を充填する工程の後に、一対の金型を完
全に型閉めする工程を行うとともに、成形面の加熱した
部分に溶融樹脂層を形成する工程を、一対の金型間に原
料粒子を充填する工程から、次の一対の金型を完全に型
閉めする工程の終了後も引続いて、所要時間継続させて
行わせることを例示している。更に、請求項１１では、
溶融樹脂層を硬化させて成形品表面に対応する部分に連
続した表面硬化層を形成する工程の後に、通常の発泡成
形の工程を行わせることを例示している。又、請求項１
２では、発泡性合成樹脂原料粒子に発泡倍率が３〜１５
０倍の範囲内のものを用いることを例示している。更
に、請求項１３では、成形品表面に対応する部分に形成
される表面硬化層の厚みが０．１〜５．０ｍｍであるこ
とを例示している。又、請求項１４では、発泡性合成樹
脂原料粒子を発泡性ポリスチレン系樹脂原料粒子又は発
泡性ポリオレフィン系樹脂原料粒子の中から選択して用
いることを例示している。Next, according to a seventh aspect of the present invention, there is provided an expandable synthetic resin raw material particle for filling a part or the whole of a molding surface of an in-mold foam molding die, which is composed of a pair of molds, in the closed mold. A step of heating above the melting point, a step of filling the raw material particles between a pair of molds closed with a gap larger than a general cracking gap, and a raw material in the portion heated above the melting point of the raw material particles on the molding surface. In-mold foam molding consisting of the steps of contacting and melting particles to form a molten resin layer on this part, and the step of curing the molten resin layer to form a continuous hardened layer on the part corresponding to the surface of the molded product. The gist is a molding method of a foamed synthetic resin molded product, which comprises forming a surface-hardened layer from raw material particles on the surface of the molded product in the process. Separately, in claim 8, a part or the whole of the molding surface of a mold for in-mold foam molding composed of a pair of molds is heated to a temperature equal to or higher than the melting point of the expandable synthetic resin raw material particles to be filled inside the closed mold. And a step of filling the raw material particles between a pair of molds closed with a gap larger than a general cracking gap,
At least for a period of time, the raw material particles are heated to a temperature higher than the melting point of the raw material particles on the molding surface, and the raw material particles filled between a pair of molds are forcedly pressed and brought into contact with each other to melt the molten resin layer. Forming a surface-hardened layer from the raw material particles on the surface of the molded product in the in-mold foam molding process, which comprises the step of forming the The gist is a molding method of a foamed synthetic resin molded article characterized by Further, in claim 9, the step of heating a part or the whole of the molding surface to a temperature equal to or higher than the melting point of the expandable synthetic resin raw material particles is started prior to the other steps, and a molten resin layer is formed on the heated part of the molding surface. It illustrates that the forming step is started at the same time as the step of filling the raw material particles between the pair of molds. In claim 10, the step of completely closing the pair of molds is performed after the step of filling the expandable synthetic resin raw material particles between the pair of molds in claim 9, and the molding surface is heated. From the step of filling the raw material particles between the pair of molds to the step of forming the molten resin layer on the part, the process continues for the required time after the step of completely closing the pair of molds. It is illustrated that it is made to be performed. Further, in claim 11,
It is illustrated that a normal foam molding step is performed after the step of curing the molten resin layer to form a continuous surface-hardened layer on the portion corresponding to the surface of the molded product. Also, claim 1
In 2, the foaming synthetic resin raw material particles have a foaming ratio of 3 to 15
It is illustrated that one within the range of 0 times is used. Furthermore, claim 13 exemplifies that the thickness of the surface-hardened layer formed in the portion corresponding to the surface of the molded product is 0.1 to 5.0 mm. In addition, claim 14 exemplifies that the expandable synthetic resin raw material particles are selected and used from the expandable polystyrene resin raw material particles or the expandable polyolefin resin raw material particles.
【００１４】そして、請求項１５では、一対の金型から
構成される型内発泡成形用金型で、成形面の一部又は全
面背後に、この部分をその型閉めした内部に充填する発
泡性合成樹脂原料粒子の融点以上に加熱する加熱手段を
設けた型内発泡成形用金型を開示した。又、請求項１６
では、加熱手段が、成形面の発泡性合成樹脂原料粒子の
融点以上に加熱する部分背後に閉鎖状に設けた加熱間隙
内にヒーターを内装させて構成されたことを例示した。According to a fifteenth aspect of the present invention, there is provided an in-mold foam molding die comprising a pair of molds, wherein a part of the molding surface or the entire back surface of the molding surface is filled with the foaming property. Disclosed is an in-mold foam molding die provided with a heating means for heating the synthetic resin raw material particles to a temperature equal to or higher than the melting point. Also, claim 16
Exemplifies that the heating means is configured by incorporating a heater in a heating gap provided in a closed shape behind a portion of the molding surface which is heated above the melting point of the expandable synthetic resin raw material particles.
【００１５】[0015]
【作用】而して、各種発泡合成樹脂成形品表面の内面側
表面や外面側表面、又別に一部適所又は全面に剥離性や
陥没性を改善する表面硬化層を形成するものである。具
体的には、緩衝材では、例えば収容物と直接接触する内
面側表面に表面硬化層を形成したり、又収容箱では、例
えば外部に曝される外面側表面に表面硬化層を形成する
ものである。Thus, a surface-hardening layer for improving peelability and depression is formed on the inner surface and outer surface of the surface of various foamed synthetic resin molded products, or on a part of the proper surface or the entire surface. Specifically, in a cushioning material, for example, a surface-hardened layer is formed on the inner surface side surface that is in direct contact with a contained object, and in a storage box, for example, a surface-hardened layer is formed on the outer surface side surface exposed to the outside. Is.
【００１６】[0016]
【実施例】本発明に係る発泡合成樹脂成形品、その成形
方法並びに型内発泡成形用金型の詳細を更に添付の図面
に基づき説明する。The details of a foamed synthetic resin molded article, a molding method therefor, and an in-mold foam molding die according to the present invention will be described with reference to the accompanying drawings.
【００１７】図１には本発明に係る発泡合成樹脂成形品
の一例として緩衝材を示している。この成形品１は、一
対の金型から構成される型内発泡成形用金型内に発泡性
合成樹脂原料粒子を充填し、発泡融着させて成形された
ものである。そして、これは、他の外装箱に収容したと
きに、外部に曝されるとともに、収容物と直接接触する
口縁を含む内面側表面に剥離性や陥没性を改善する連続
した表面硬化層２を型内発泡成形過程で原料粒子を溶融
させた後、硬化させて形成したものである。FIG. 1 shows a cushioning material as an example of a foamed synthetic resin molded article according to the present invention. This molded article 1 is formed by filling in-mold foam molding molds composed of a pair of molds with expandable synthetic resin raw material particles and foam-fusing them together. Then, this is a continuous surface-hardened layer 2 that improves the peelability and depression on the inner surface side including the rim that is exposed to the outside and directly contacts the contained matter when stored in another outer box. Is formed by melting the raw material particles in the in-mold foam molding process and then curing.
【００１８】図２、図３は、この内面側表面部分の組織
を模式的に示したものであるが、図中２は表面硬化層、
３はその背後の発泡融着した原料粒子である。このよう
な連続した表面硬化層２は、この成形品１を成形する型
内発泡成形用金型の成形面の対応した部分を原料粒子の
融点以上に加熱して、型内発泡成形過程で成形面の加熱
した部分に原料粒子を接触させて溶融させ、その部分に
溶融樹脂層を形成した後、この溶融樹脂層を硬化させて
形成されるものである。ところで、こうした連続した表
面硬化層２を均一に形成するには、これの前に成形面の
加熱した部分に均一に溶融樹脂層を形成する必要があ
る。このため、溶融樹脂層を形成する過程で、一対の金
型を完全に型閉めすることで、成形面の加熱した部分に
接触した最外層の原料粒子だけでなく、ここに少なくと
もこれらの原料粒子間背後の原料粒子をも強制的に接触
させて溶融させるのである。このようにして、型内発泡
成形過程で成形品１表面に表面硬化層２が形成されるの
であるが、図２には表面硬化層２と背後の発泡融着した
原料粒子３の境界部分では、表面硬化層２の一部を原料
粒子３の一部が溶融して形成し、表面硬化層２と背後の
原料粒子３が接着したものを、又図３にはこれらの境界
部分では、表面硬化層２背後に発泡融着した原料粒子３
が原形をとどめたまま融着したものをそれぞれ示してい
る。2 and 3 schematically show the structure of the surface portion on the inner surface side. In the drawings, 2 is a surface hardened layer.
3 is the raw material particles behind which the foam fusion was carried out. Such a continuous surface-hardened layer 2 is formed in the in-mold foam molding process by heating the corresponding part of the molding surface of the in-mold foam molding mold for molding the molded product 1 to a temperature not lower than the melting point of the raw material particles. The raw material particles are brought into contact with the heated portion of the surface to be melted, a molten resin layer is formed on that portion, and then the molten resin layer is cured. By the way, in order to form such a continuous surface-hardened layer 2 uniformly, it is necessary to form a molten resin layer uniformly on the heated portion of the molding surface before this. Therefore, in the process of forming the molten resin layer, by completely closing the pair of molds, not only the raw material particles of the outermost layer in contact with the heated portion of the molding surface, but here at least these raw material particles The raw material particles in the back and forth are also forcedly contacted and melted. In this way, the surface-hardened layer 2 is formed on the surface of the molded article 1 in the in-mold foam molding process. In FIG. 2, the surface-hardened layer 2 and the foam-fused raw material particles 3 at the back are bordered. The surface-hardened layer 2 is formed by melting a part of the raw material particles 3, and the surface-hardened layer 2 and the raw material particles 3 behind are adhered to each other. Raw material particles 3 foamed and fused behind the hardened layer 2
Shows the fusion of the original shapes.
【００１９】ところで、ここに用いる発泡性合成樹脂原
料粒子としては、発泡性ポリスチレン系樹脂原料粒子又
は発泡性ポリエチレン系樹脂原料粒子、発泡性ポリプロ
ピレン系樹脂原料粒子等の発泡性ポリオレフィン系樹脂
原料粒子、その他発泡性共重合系樹脂原料粒子が利用可
能である。そして、これらの中では、発泡性ポリオレフ
ィン系樹脂原料粒子は表面硬化層２が形成しやすいので
好ましいと言える。特に、発泡性ポリプロピレン系樹脂
原料粒子を用いると、これから形成される表面硬化層２
は耐屈曲性に優れるので、例えば蓋を一体に有する容器
を形成する場合には、これらのヒンジを作成する上で有
効なものとなる。そして、ここに用いる原料粒子は、樹
脂素材として、架橋した合成樹脂、非架橋の合成樹脂の
いずれも利用できるが、表面硬化層２を良好に形成する
ことを考えた場合、非架橋の合成樹脂が好ましいと言え
る。As the expandable synthetic resin raw material particles used here, expandable polystyrene resin raw material particles or expandable polyethylene resin raw material particles, expandable polypropylene resin raw material particles such as expandable polypropylene resin raw material particles, In addition, foamable copolymer resin raw material particles can be used. Of these, expandable polyolefin resin raw material particles are preferable because the surface-hardened layer 2 is easily formed. In particular, when the expandable polypropylene resin raw material particles are used, the surface-hardened layer 2 formed from this
Has excellent bending resistance, and is effective in producing these hinges, for example, when forming a container having an integrated lid. The raw material particles used here may be either a cross-linked synthetic resin or a non-cross-linked synthetic resin as a resin material. However, in consideration of forming the surface-hardened layer 2 favorably, the non-cross-linked synthetic resin is used. Can be said to be preferable.
【００２０】又、原料粒子は予備発泡させないものを用
いることもできるが、予備発泡させたものを用いること
が特に考慮される。そして、原料粒子の発泡倍率は用い
る樹脂素材によっても若干変動するが、３〜１５０倍の
範囲内が好ましい。この発泡倍率は、発泡性ポリスチレ
ン系樹脂原料粒子では３〜１００倍、好ましくは３〜５
０倍、又発泡性ポリオレフィン系樹脂原料粒子では３〜
６０倍、好ましくは３〜４５倍の範囲内のものがそれぞ
れ好適に利用可能である。又、粒径は用いる樹脂素材に
よっても若干変動するが、１〜１０ｍｍの範囲内のもの
が好適に利用できる。Further, as the raw material particles, those which are not pre-expanded can be used, but it is particularly considered to use those which are pre-expanded. The expansion ratio of the raw material particles varies slightly depending on the resin material used, but is preferably in the range of 3 to 150 times. This expansion ratio is 3 to 100 times, and preferably 3 to 5 for the expandable polystyrene resin raw material particles.
0 times, and 3 to 3 for expandable polyolefin resin raw material particles
Those in the range of 60 times, preferably 3 to 45 times can be suitably used. Although the particle size varies slightly depending on the resin material used, a particle size in the range of 1 to 10 mm can be preferably used.
【００２１】更に、表面硬化層２を形成する原料粒子と
それの背後に融着する原料粒子は必ずしも同種の原料粒
子を用いることなく、異種の原料粒子を用いることも可
能である。尚、ここで言う異種の原料粒子とは、同種の
樹脂素材から形成されたものであっても、発泡倍率、粒
径の異なるもの、又着色されたものと着色されないも
の、更には着色された色の異なるものをも含む概念であ
る。又、異種の樹脂素材から形成された原料粒子でも、
発泡性ポリスチレン系樹脂原料粒子と発泡性ポリプロピ
レン系樹脂原料粒子は融着する。Further, the raw material particles forming the surface-hardened layer 2 and the raw material particles fused behind the raw material particles do not necessarily use the same raw material particles, but different raw material particles can be used. It should be noted that the heterogeneous raw material particles referred to herein include those having different expansion ratios and particle diameters, even those formed from the same kind of resin material, colored ones and non-colored ones, and further colored ones. It is a concept that includes things with different colors. Also, even with raw material particles formed from different types of resin materials,
The expandable polystyrene resin raw material particles and the expandable polypropylene resin raw material particles are fused.
【００２２】更に、表面硬化層２の厚みは、後述するよ
うに用いる原料粒子の発泡倍率と一対の金型間に原料粒
子を充填するときに残す間隙幅から一般的なクラッキン
グ間隙幅を除いた間隙幅の関係に応じて自由に決定され
るが、０．１〜５．０ｍｍ、好ましくは０．３〜５．０
ｍｍに形成することが可能である。Further, the thickness of the surface hardened layer 2 is obtained by removing the general cracking gap width from the expansion ratio of the raw material particles used and the gap width left between the pair of molds when the raw material particles are filled. It is freely determined according to the relationship of the gap width, but is 0.1 to 5.0 mm, preferably 0.3 to 5.0
It is possible to form it in mm.
【００２３】そして、図４、図５には実際に成形した成
形品１の内面側表面部分の２０倍に拡大した組織をそれ
ぞれ示している。これらの中で、図４は前述した図２
に、又図５は図３にそれぞれ相当するものである。尚、
図中４は発泡融着した原料粒子の表皮、５は原料粒子３
内の多数のセル膜６で区画されたセルである。ところ
で、これら図４、図５からも判るように、原料粒子を溶
融させた後、硬化させて形成される表面硬化層２の内部
には、原料粒子のセル内に型内発泡成形用金型内に充填
する前に滞留する発泡手段となる分解型又は発揮型の発
泡剤や空気等の気化物又はガスから形成されたと判断さ
れる気泡７が独立、分散した状態で存在している。又、
この気泡７は、これを形成する過程の少なくとも一時
期、型内発泡成形用金型における成形面の加熱した部分
に一対の金型間に充填した原料粒子を強制的に押圧する
ことに起因して、図４、図５からも判るように多数が表
面硬化層２の厚み方向に偏平になるとともに、特に一部
はその端部が切れ長状になっている。こうしたことか
ら、この表面硬化層２は特にその内部に気泡７が多数形
成され、又その気泡７の形状に起因して、全体として緩
衝性並びに復元性を備えたものとなる。FIGS. 4 and 5 show the structures of the molded product 1 actually molded, which are magnified 20 times as much as the surface portion on the inner surface side. Among these, FIG. 4 is the same as FIG.
5 and FIG. 5 correspond to FIG. 3, respectively. still,
In the figure, 4 is the skin of the raw material particles foamed and fused, 5 is the raw material particle 3
The cells are divided by a large number of cell membranes 6 inside. By the way, as can be seen from FIGS. 4 and 5, inside the surface-hardened layer 2 formed by melting the raw material particles and then curing the raw material particles, a mold for in-mold foam molding is provided in the cell of the raw material particles. The bubbles 7 that are determined to be formed from a decomposing type or exhibiting type foaming agent serving as a foaming means that accumulates before being filled therein, or a vaporized substance such as air, or a gas exist independently and dispersed. or,
This bubble 7 is caused by forcibly pressing the raw material particles filled between the pair of molds to the heated part of the molding surface of the mold for in-mold foam molding at least for a period of time during the process of forming it. As can be seen from FIGS. 4 and 5, many of them are flat in the thickness direction of the surface-hardened layer 2, and in particular, some of the ends are cut and elongated. For this reason, the surface-hardened layer 2 has a large number of bubbles 7 formed therein, and due to the shape of the bubbles 7, has a buffering property and a restoring property as a whole.
【００２４】次に、図１に示す成形品１の成形方法の詳
細をその型内発泡成形用金型の概略を基に説明する。図
６、図７には、この成形用金型10の概略を示している
が、これは、一対の図中11として示すキャビティ金型と
12として示すコア金型から構成されるものである。図示
した実施例では、一対のキャビティ金型11とコア金型12
を垂直方向に配設するとともに、キャビティ金型11に対
してコア金型12を図中左側の側方に退避させて、一対の
キャビティ金型11とコア金型12の型開きができるように
なっている。又、一対のキャビティ金型11とコア金型12
を型閉めしたときには、両者の間に成形品１の成形空間
13が形成される。尚、図中14はキャビティ金型11の成形
空間13に対面した成形面、15はコア金型12の同じく成形
空間13に対面した成形面である。更に、16、17はキャビ
ティ金型11、コア金型12の成形面14、15背後に閉鎖状に
形成された加熱室を示している。そして、図中18は型閉
めした一対のキャビティ金型11とコア金型12間に形成さ
れる成形空間13内に発泡性合成樹脂原料粒子を充填する
原料充填フィダーである。尚、19はコア金型12の成形面
15背後に設けたこの部分を原料粒子の融点以上に加熱す
る加熱手段を示している。Next, details of the molding method of the molded product 1 shown in FIG. 1 will be described based on the outline of the in-mold foam molding mold. 6 and 7 show the outline of the molding die 10, which is composed of a cavity die shown as 11 in a pair of figures.
It is composed of a core mold shown as 12. In the illustrated embodiment, a pair of cavity mold 11 and core mold 12
And the core mold 12 is retracted to the left side in the figure with respect to the cavity mold 11 so that the pair of cavity mold 11 and core mold 12 can be opened. Has become. Also, a pair of cavity mold 11 and core mold 12
When the mold is closed, the molding space for the molded product 1
13 is formed. In the figure, 14 is a molding surface facing the molding space 13 of the cavity mold 11, and 15 is a molding surface of the core mold 12 similarly facing the molding space 13. Further, reference numerals 16 and 17 denote heating chambers formed in a closed shape behind the molding surfaces 14 and 15 of the cavity mold 11 and the core mold 12. Further, reference numeral 18 in the figure denotes a raw material filling feeder for filling the expandable synthetic resin raw material particles into the molding space 13 formed between the pair of cavity molds 11 and the core mold 12 that are closed. In addition, 19 is a molding surface of the core mold 12.
15 Shows a heating means for heating this portion provided at the back to a temperature equal to or higher than the melting point of the raw material particles.
【００２５】而して、このような型内発泡成形用金型10
を利用して、図１に示す成形品１は次のように成形され
る。先ず、コア金型12の成形面15全面を加熱手段19を加
熱させることで、原料粒子の融点以上、例えば原料粒子
の樹脂素材がポリスチレン系樹脂、ポリオレフィン系樹
脂の場合、約２００℃以上に加熱する第１工程の操作を
行う。次に、通常、３〜５ｍｍとされる一般的なクラッ
キング間隙より大きな、例えば１０〜１５０ｍｍの間隙
を残して図７に示すように型閉めした一対のキャビティ
金型11とコア金型12間の成形空間13内に原料充填フィダ
ー18を通じた空気送給で原料粒子を充填する第２工程の
操作を行う。この後、一対のキャビティ金型11とコア金
型12を完全に型閉めする第３工程の操作を行う。ここ
で、第２工程と並行して、コア金型12の原料粒子の融点
以上に加熱した成形面15全面に原料粒子を接触させて溶
融させ、この成形面15全面に溶融樹脂層を形成する第４
工程の操作が行われる。そして、第３工程の操作の終了
後、所要時間、例えば０〜１５０秒経過したら、コア金
型12背後の加熱室17に、例えば冷却水を供給して冷却す
る。これと同時に、第４工程の操作が終了する。この段
階で、コア金型12の成形面15全面に沿って、溶融樹脂層
を硬化させて連続した表面硬化層２が形成される第５工
程の操作が行われる。このとき、同時に表面硬化層２と
背後の原料粒子の境界部分では、表面硬化層２の一部を
原料粒子の一部が溶融して形成し、表面硬化層２と背後
の原料粒子が接着したり、又は表面硬化層２背後に発泡
融着しない又は発泡融着した原料粒子が原形をとどめた
まま融着する。ここで、コア金型12の成形面15全面に溶
融樹脂層を形成する第４工程の操作は、一対のキャビテ
ィ金型11とコア金型12間の成形空間13内に原料粒子を充
填する第２工程と同時に開始し、一対のキャビティ金型
11とコア金型12を完全に型閉めする第３工程の操作の終
了後も引続いて、所要時間継続させて行うようにしてい
る。これは、連続した表面硬化層２を均一に形成するに
は、これの前に加熱したコア金型12の成形面15全面に均
一に溶融樹脂層を形成する必要があるからである。即
ち、一対のキャビティ金型11とコア金型12を完全に型閉
めすると、コア金型12の成形面15の図中垂直面には型閉
め力と原料粒子間の圧縮反力で、又図中水平面には原料
粒子間の圧縮反力でそれぞれ加熱したコア金型12の成形
面15に成形空間13内に充填した原料粒子を強制的に押圧
できる。このため、加熱したコア金型12の成形面15全面
に接触した最外層の原料粒子だけでなく、ここに少なく
ともこれらの原料粒子間背後の原料粒子をも強制的に接
触させて溶融させることが可能となるのである。又、第
４工程の溶融樹脂層の厚みが大きくなる後半はその背後
に原料粒子が充満しているから、成形面15の図中垂直面
に形成される溶融樹脂層が流下することがなく、均一に
なる。この後、キャビティ金型11背後の加熱室16に蒸気
を供給して、これを通常の発泡成形温度、例えば原料粒
子の樹脂素材がポリスチレン系樹脂、ポリオレフィン系
樹脂の場合、１０５〜１１０℃程度に加熱し、成形空間
13内の原料粒子を発泡融着させる通常の発泡成形の第６
工程の操作を行う。最後に、キャビティ金型11背後の加
熱室16に、例えば冷却水を供給して冷却する。そして、
コア金型12を側方に退避させて、一対のキャビティ金型
11とコア金型12を型開きし、加熱したコア金型12の成形
面15全面に対応した口縁を含む内面側表面に原料粒子か
ら表面硬化層２を形成した成形品１を取出すのである。Thus, such an in-mold foam molding die 10 is used.
The molded product 1 shown in FIG. 1 is molded by utilizing the following. First, by heating the entire molding surface 15 of the core die 12 by the heating means 19, the temperature is higher than the melting point of the raw material particles, for example, about 200 ° C. or higher when the resin material of the raw material particles is polystyrene resin or polyolefin resin. The operation of the first step is performed. Next, between the pair of cavity mold 11 and core mold 12 which are closed as shown in FIG. 7 with a gap of 10 to 150 mm, which is larger than a general cracking gap of 3 to 5 mm, left. The operation of the second step of filling the raw material particles in the molding space 13 by air feeding through the raw material filling feeder 18 is performed. Then, the third step of completely closing the pair of cavity mold 11 and core mold 12 is performed. Here, in parallel with the second step, the raw material particles are brought into contact with the entire surface of the molding surface 15 of the core die 12 heated above the melting point of the raw material particles to be melted, and a molten resin layer is formed on the entire surface of the molding surface 15. Fourth
Operation of the process is performed. After a lapse of a required time, for example, 0 to 150 seconds after the operation of the third step, cooling water is supplied to the heating chamber 17 behind the core die 12 to cool it. At the same time, the operation of the fourth step ends. At this stage, the operation of the fifth step is performed in which the continuous surface-hardened layer 2 is formed by hardening the molten resin layer along the entire molding surface 15 of the core mold 12. At this time, at the same time, in the boundary portion between the surface-hardened layer 2 and the raw material particles behind, a part of the raw material particles is formed by melting a part of the raw material particles, and the surface-hardened layer 2 and the raw material particles behind are bonded. Alternatively, the raw material particles that are not foamed and fused or that have been foamed and fused behind the surface-hardened layer 2 are fused while keeping their original shape. Here, the operation of the fourth step of forming the molten resin layer on the entire molding surface 15 of the core mold 12 is performed by filling the molding space 13 between the pair of cavity molds 11 and the core mold 12 with the raw material particles. Starts at the same time with two steps, a pair of cavity molds
After the operation of the third step for completely closing the mold 11 and the core mold 12, the operation is continued for the required time. This is because it is necessary to form a molten resin layer uniformly on the entire molding surface 15 of the heated core die 12 before forming the continuous surface-hardened layer 2 uniformly. That is, when the pair of cavity mold 11 and core mold 12 are completely closed, the vertical surface of the molding surface 15 of the core mold 12 in the drawing is a mold closing force and a compression reaction force between the raw material particles. The raw material particles filled in the molding space 13 can be forcibly pressed to the molding surface 15 of the core mold 12 heated by the compression reaction force between the raw material particles on the middle horizontal surface. Therefore, not only the outermost raw material particles that have contacted the entire molding surface 15 of the heated core die 12 but also at least the raw material particles between these raw material particles can be forcibly contacted and melted. It will be possible. In the latter half of the fourth step where the thickness of the molten resin layer increases, the raw material particles are filled behind the molten resin layer, so that the molten resin layer formed on the vertical surface of the molding surface 15 in the drawing does not flow down. Be uniform. After that, steam is supplied to the heating chamber 16 behind the cavity mold 11 to adjust the temperature to a normal foaming temperature, for example, about 105 to 110 ° C. when the resin material of the raw material particles is polystyrene resin or polyolefin resin. Heating and molding space
No. 6 of ordinary foam molding to foam and fuse raw material particles in 13
Perform process operations. Finally, for example, cooling water is supplied to the heating chamber 16 behind the cavity mold 11 to cool it. And
Retract the core mold 12 to the side to create a pair of cavity molds.
11 and the core mold 12 are opened, and the molded product 1 having the surface hardened layer 2 formed from the raw material particles on the inner surface side including the rim corresponding to the entire molding surface 15 of the heated core mold 12 is taken out. .
【００２６】このようにして、型内発泡成形過程で成形
品１表面に原料粒子から表面硬化層２が形成されるので
あるが、この表面硬化層２の厚みＡ〔ｍｍ〕は用いる原
料粒子の発泡倍率Ｂ〔倍〕と一対のキャビティ金型11と
コア金型12間の成形空間13内に原料粒子を充填するとき
に残す間隙幅から一般的なクラッキング間隙幅を除いた
間隙幅Ｃ〔ｍｍ〕の関係から、次式で示される。 表面硬化層の厚みＡ〔ｍｍ〕＝（用いる原料粒子の発泡
倍率Ｂ〔倍〕）／（一対のキャビティ金型とコア金型間
に原料粒子を充填するときに残す間隙幅から一般的なク
ラッキング間隙幅を除いた間隙幅Ｃ〔ｍｍ〕） 即ち、用いる原料粒子の発泡倍率Ｂが３０倍で、一対の
キャビティ金型11とコア金型12間に原料粒子を充填する
ときに残す間隙幅から一般的なクラッキング間隙幅を除
いた間隙幅Ｃが３０ｍｍの場合、成形品１表面に対応す
る部分に形成される表面硬化層２の厚みＡは１ｍｍにな
る。尚、一対のキャビティ金型11とコア金型12間の成形
空間13内に原料粒子を充填するときに残す間隙幅が大き
くなると、表面硬化層２の厚みＡはこれと用いる原料粒
子の発泡倍率Ｂだけで決定される。In this way, the surface-hardened layer 2 is formed from the raw material particles on the surface of the molded article 1 in the in-mold foam molding process. The thickness A [mm] of the surface-hardened layer 2 depends on the raw material particles to be used. The expansion ratio B [times] and the gap width C [mm, which is obtained by removing the general cracking gap width from the gap width left when the raw material particles are filled in the molding space 13 between the pair of cavity mold 11 and the core mold 12. ], It is shown by the following formula. Thickness of surface-hardened layer A [mm] = (foaming ratio B [times] of raw material particles used) / (general cracking from gap width left when filling raw material particles between a pair of cavity mold and core mold) The gap width C [mm] excluding the gap width) That is, from the gap width left when filling the raw material particles between the pair of cavity mold 11 and core mold 12 when the expansion ratio B of the raw material particles used is 30 times. When the gap width C excluding the general cracking gap width is 30 mm, the thickness A of the hardened surface layer 2 formed in the portion corresponding to the surface of the molded product 1 is 1 mm. When the gap width left when the raw material particles are filled in the molding space 13 between the pair of cavity mold 11 and the core mold 12 becomes large, the thickness A of the surface-hardened layer 2 is the expansion ratio of the raw material particles to be used. It is decided only by B.
【００２７】ここで、一対のキャビティ金型11とコア金
型12を完全に型閉めする第３工程の操作の後、再度、一
対のキャビティ金型11とコア金型12間に間隙をあける操
作を繰返して行うこともできる。この場合、一対のキャ
ビティ金型11とコア金型12間に間隙をあけたときに、再
度、原料粒子を充填することも可能である。Here, after the operation of the third step of completely closing the pair of cavity mold 11 and the core mold 12, the operation of opening a gap between the pair of cavity mold 11 and the core mold 12 again. Can be repeated. In this case, it is possible to fill the raw material particles again when the gap is formed between the pair of cavity mold 11 and the core mold 12.
【００２８】又、一対のキャビティ金型11とコア金型12
間の成形空間13内に原料粒子を充填する場合、圧縮空気
を利用して、圧縮充填することもできる。Also, a pair of cavity mold 11 and core mold 12
When the raw material particles are filled in the molding space 13 between them, compressed air can be used for compression filling.
【００２９】更に、前述したように操作を行う他、コア
金型12の成形面15全面を加熱する第１工程と、一般的な
クラッキング間隙より大きな間隙を残して型閉めした一
対のキャビティ金型11とコア金型12間の成形空間13内に
原料粒子を充填する第２工程は同時に開始させても、又
第２工程に遅れて第１工程を開始させても、更に第２工
程の終了後、第１工程を開始させてもいずれでもよい。
又、第３工程の操作の終了後、コア金型12背後の加熱室
17に、例えば冷却水を供給して冷却することなく、ここ
に蒸気を供給して、通常の発泡成形温度に降温させ、第
６工程の操作の終了後、冷却するようにしてもよい。In addition to the above-described operations, the first step of heating the entire molding surface 15 of the core mold 12 and a pair of cavity molds closed with a gap larger than a general cracking gap. Even if the second step of filling the raw material particles into the molding space 13 between the core mold 11 and the core die 12 is started at the same time, or if the first step is started after the second step, the second step is finished. After that, the first step may be started or any of them may be started.
Also, after the operation of the third step, the heating chamber behind the core mold 12
For example, the cooling water may not be supplied to cool the steam, but steam may be supplied to cool the foaming temperature to a normal foam molding temperature, and the cooling may be performed after the operation of the sixth step is completed.
【００３０】そして、コア金型12の成形面15全面は原料
粒子の融点以上、前述した例では、約２００℃以上に加
熱するのであるが、この加熱温度は原料粒子の樹脂素材
によっても変動するので、最適な加熱温度は実際に仮成
形を行なった上、選定することが考慮される。ところ
で、この加熱温度は低い方が、成形品１表面に形成され
る表面硬化層２が美麗な状態になる。The entire molding surface 15 of the core mold 12 is heated to the melting point of the raw material particles or above, in the above-mentioned example, to about 200 ° C. or higher, but this heating temperature also varies depending on the resin material of the raw material particles. Therefore, it is considered to select the optimum heating temperature after actually performing the temporary molding. By the way, the lower the heating temperature, the more beautiful the surface-hardened layer 2 formed on the surface of the molded article 1 becomes.
【００３１】又、コア金型12は熱損失が大きくなるよう
に予め薄肉に形成して、原料粒子を溶融させることで、
ある程度、自然降温させる態様にすることもできる。そ
して、コア金型12が、このような態様の場合、加熱温度
を過剰に高く設定して、原料粒子と接触させることで、
冷却させることも可能になる。Further, the core die 12 is formed thin in advance so that the heat loss becomes large, and the raw material particles are melted,
To some extent, the temperature may be naturally lowered. Then, in the case of such a mode, the core die 12 is set to have an excessively high heating temperature, and is brought into contact with the raw material particles,
It also becomes possible to cool.
【００３２】次に、図８には成形品１表面の全面に表面
硬化層２を形成した場合の表面部分の組織を模式的に示
している。このように表面硬化層２を表面全面に形成し
た後では、内部に蒸気又は他の加熱媒体を通すことがで
きず、内部の原料粒子３は発泡融着せずに圧縮された状
態になる。尚、４は発泡融着していない原料粒子３の表
皮を示している。Next, FIG. 8 schematically shows the texture of the surface portion when the hardened layer 2 is formed on the entire surface of the molded product 1. After the surface-hardened layer 2 is formed on the entire surface in this way, vapor or another heating medium cannot be passed inside, and the raw material particles 3 inside are in a compressed state without being foamed and fused. In addition, 4 has shown the skin of the raw material particle 3 which is not foamed and fused.
【００３３】そして、図９には図８に示す成形品１を成
形する型内発泡成形用金型10の概略を示している。この
成形用金型10には、コア金型12の成形面15背後に加熱手
段19を設けるとともに、キャビティ金型11の成形面14背
後にも加熱手段20を設けている。ところで、このような
成形用金型10で成形品１を成形した場合、表面硬化層２
が形成された後では、内部側に蒸気又は他の加熱媒体を
通すことができない。このため、内部の原料粒子３は前
述したように発泡融着せずに圧縮された状態になってい
る。こうしたことから、成形後、内部の原料粒子を吹出
すと、中空成形品を成形することができる。そして、こ
の場合、内部の原料粒子を吹出した後で、異種の原料粒
子を充填することも可能である。このとき、異種の原料
粒子としては、表面硬化層２に融着しないものを利用す
ることもできる。FIG. 9 shows an outline of the in-mold foam molding die 10 for molding the molded product 1 shown in FIG. The molding die 10 is provided with heating means 19 behind the molding surface 15 of the core die 12 and also behind the molding surface 14 of the cavity die 11. By the way, when the molded article 1 is molded with such a molding die 10, the surface hardened layer 2
After the formation of steam, steam or other heating medium cannot pass through to the inside. Therefore, as described above, the raw material particles 3 inside are in a compressed state without being foamed and fused. From this, a hollow molded article can be molded by blowing out the raw material particles inside after molding. Then, in this case, it is also possible to fill different kinds of raw material particles after blowing out the raw material particles inside. At this time, as the different raw material particles, those which are not fused to the surface hardened layer 2 can be used.
【００３４】ところで、こうした成形の際に、成形空間
13内に通気口を有する蒸気又は他の加熱媒体の供給パイ
プを突出させ、このパイプに蒸気又は他の加熱媒体を吹
込むことで、内部の原料粒子を発泡融着させることも可
能である。By the way, during such molding, the molding space
It is also possible to project the supply pipe of steam or other heating medium having a vent inside 13 and blow the steam or other heating medium into this pipe to foam and fuse the raw material particles inside.
【００３５】又、成形品１の口縁を除く外面側表面に表
面硬化層２を形成する場合には、キャビティ金型11の成
形面14背後にだけ加熱手段20を設けた図示しない成形用
金型で成形する。Further, when the surface hardened layer 2 is formed on the outer surface of the molded product 1 excluding the rim, a molding die (not shown) in which the heating means 20 is provided only behind the molding surface 14 of the cavity die 11 is formed. Mold with a mold.
【００３６】次に、図10には図１に示す発泡合成樹脂成
形品１を成形する型内発泡成形用金型10の具体例を示し
ている。この成形用金型10は、一対のキャビティ金型11
とコア金型12を垂直方向に配設するとともに、キャビテ
ィ金型11に対してコア金型12を図中左側の側方に退避さ
せて、一対のキャビティ金型11とコア金型12の型開きが
できるようになっている。又、13は一対のキャビティ金
型11とコア金型12を型閉めしたときに、両者の間に形成
される成形品１の成形空間を示している。尚、図中14は
キャビティ金型11の成形空間13に対面した成形面、15は
コア金型12の同じく成形空間13に対面した成形面であ
る。更に、16、17はキャビティ金型11、コア金型12の成
形面14、15背後に閉鎖状に形成された加熱室を示してい
る。そして、図中18は型閉めした一対のキャビティ金型
11とコア金型12間に形成される成形空間13内に発泡性合
成樹脂原料粒子を充填する原料充填フィダーである。
尚、19はコア金型12の成形面15背後に設けたこの部分を
原料粒子の融点以上に加熱する加熱手段を示している。
この加熱手段19は、図11に詳細を示すようにコア金型12
の成形面15背後に間隔をあけて背面壁21を設けて閉鎖状
の加熱間隙22を形成し、この内部にヒーター23を内装さ
せて構成されたものである。又、図中24はキャビティ金
型11の成形面14と加熱室16を連通させる通気口である。
ところで、コア金型12には、成形面15に溶融樹脂層が形
成された後では、蒸気又は他の加熱媒体は通らないか
ら、このような通気口は設けられていない。更に、25は
キャビティ金型11の加熱室16内に一端をのぞませた蒸気
管、26、27はキャビティ金型11、コア金型12の両加熱室
16、17内に一端側を挿入させた冷却水管、28、29は同じ
く両加熱室16、17内に一端側を挿入させた送気管、30、
31はドレン管、32はキャビティ金型11側に設けた離型ピ
ンである。又、33、34は冷却水管26、27に成形面14、15
背後に向けて設けた噴射ノズル、35、36は送気管28、29
に同じく成形面14、15背後に向けて設けた送気口を示し
ている。尚、図中37、38はドレン管30、31途中に設けた
バルブである。更に、39、40はバックプレート、41、42
は側プレート、43はインナープレート、又44、45はそれ
ぞれキャビティ金型11、コア金型12の成形面14、15を形
成するキャビティ側表面部材、コア側表面部材を示して
いる。そして、これらバックプレート39、40、側プレー
ト41、42、インナープレート43とキャビティ側表面部材
44、コア側表面部材45から、キャビティ金型11、コア金
型12の成形面14、15背後に閉鎖状になった加熱室16、17
が形成されている。又、前述したコア金型12の成形面15
背後の加熱手段19は図11に示すようにコア側表面部材45
に設けられている。更に、キャビティ金型11内周面とコ
ア金型12外周面間、図示した実施例では、キャビティ側
表面部材44内周面とコア側表面部材45外周面間には、図
12中に46として示す原料粒子が通過できない間隙幅を有
する通気間隙が、一対のキャビティ金型11とコア金型12
間に原料粒子を充填するときの一般的なクラッキング間
隙より大きな間隙を残して型閉めした状態と一対のキャ
ビティ金型11とコア金型12を完全に型閉めした状態間に
形成されるように接合構造47が設けられている。そし
て、この成形用金型10では、成形空間13内に原料粒子を
充填するときに、一対のキャビティ金型11とコア金型12
間に一般的なクラッキング間隙より大きな間隙を残す関
係上、この接合構造47は、従来の成形用金型と比較し
て、長く設定されている。Next, FIG. 10 shows a specific example of the in-mold foam molding die 10 for molding the foam synthetic resin molded product 1 shown in FIG. This molding die 10 includes a pair of cavity dies 11
And the core mold 12 are arranged in the vertical direction, and the core mold 12 is retracted to the left side in the drawing with respect to the cavity mold 11 to form a pair of the cavity mold 11 and the core mold 12. It can be opened. Reference numeral 13 denotes a molding space of the molded product 1 formed between the pair of cavity mold 11 and core mold 12 when the mold is closed. In the figure, 14 is a molding surface facing the molding space 13 of the cavity mold 11, and 15 is a molding surface of the core mold 12 similarly facing the molding space 13. Further, reference numerals 16 and 17 denote heating chambers formed in a closed shape behind the molding surfaces 14 and 15 of the cavity mold 11 and the core mold 12. 18 in the figure is a pair of cavity molds that are closed.
It is a raw material filling feeder that fills foamable synthetic resin raw material particles into a molding space 13 formed between a core mold 12 and a core mold 12.
Reference numeral 19 denotes a heating means provided behind the molding surface 15 of the core die 12 for heating the portion above the melting point of the raw material particles.
This heating means 19 includes a core mold 12 as shown in detail in FIG.
A rear wall 21 is provided behind the molding surface 15 with a space therebetween to form a closed heating gap 22, and a heater 23 is installed inside the heating gap 22. In addition, reference numeral 24 in the drawing denotes a ventilation port that connects the molding surface 14 of the cavity mold 11 and the heating chamber 16.
By the way, the core die 12 is not provided with such a vent since steam or other heating medium does not pass through after the molten resin layer is formed on the molding surface 15. Further, 25 is a steam pipe with one end looking into the heating chamber 16 of the cavity mold 11, and 26 and 27 are both heating chambers of the cavity mold 11 and the core mold 12.
Cooling water pipes with one end side inserted in 16 and 17, 28 and 29 are air supply pipes with one end side inserted into both heating chambers 16 and 17,
Reference numeral 31 is a drain pipe, and 32 is a release pin provided on the cavity mold 11 side. Further, 33, 34 are formed on the cooling water pipes 26, 27 on the molding surfaces 14, 15
The injection nozzles 35, 36 are installed toward the back, and the air pipes 28, 29
Similarly, an air supply port provided toward the rear of the molding surfaces 14 and 15 is shown. In the figure, 37 and 38 are valves provided in the middle of the drain pipes 30 and 31. Furthermore, 39 and 40 are back plates and 41 and 42.
Is a side plate, 43 is an inner plate, and 44 and 45 are a cavity side surface member and a core side surface member which form the molding surfaces 14 and 15 of the cavity mold 11 and the core mold 12, respectively. Then, these back plates 39, 40, side plates 41, 42, the inner plate 43 and the cavity side surface member.
44, the core side surface member 45, the cavity mold 11, the heating surface 16, 17 which is closed behind the molding surfaces 14, 15 of the core mold 12.
Are formed. In addition, the molding surface 15 of the core mold 12 described above.
As shown in FIG. 11, the heating means 19 behind the core side surface member 45
It is provided in. Further, between the inner peripheral surface of the cavity mold 11 and the outer peripheral surface of the core mold 12, between the inner peripheral surface of the cavity side surface member 44 and the outer peripheral surface of the core side surface member 45 in the illustrated embodiment,
A pair of cavity mold 11 and core mold 12 are provided with a ventilation gap having a gap width through which the raw material particles indicated by 46 cannot pass.
Formed between the mold closed state leaving a gap larger than the general cracking gap when filling raw material particles between them and the state where the pair of cavity mold 11 and core mold 12 are completely closed. A joint structure 47 is provided. Further, in this molding die 10, when the raw material particles are filled in the molding space 13, a pair of cavity mold 11 and core mold 12 is formed.
The joining structure 47 is set longer than the conventional molding die because a gap larger than a general cracking gap is left therebetween.
【００３７】この成形用金型10では、キャビティ金型1
1、コア金型12を冷却するとき、成形面14、15背後に先
ず冷却水管26、27の噴射ノズル33、34から冷却水を霧状
に噴射させ、次に送気管28、29の送気口35、36から圧縮
空気を吹付けて水分の飛散、除去を行う。In this molding die 10, the cavity die 1
1. When cooling the core mold 12, the cooling water is first sprayed from the spray nozzles 33, 34 of the cooling water pipes 26, 27 behind the molding surfaces 14, 15 and then the air is supplied by the air supply pipes 28, 29. Compressed air is blown from the mouths 35 and 36 to disperse and remove water.
【００３８】前述した図11に示すコア側表面部材45に代
えて、図13に示すコア側表面部材48を用いても同等の効
果が期待できる。このコア側表面部材48は、成形面15背
後に間隔をあけて背面壁21を設けることなく、成形面15
と反対側に一対の対向壁49、49を間隔をあけて設けて閉
鎖状の加熱間隙50を形成し、この加熱間隙50にヒーター
23を内装させたものである。そして、コア側表面部材48
の加熱間隙50を貫通させて冷却水管27、送気管29が、そ
の噴射ノズル34、送気口36を成形面15背後に向けて設け
られている。Even if the core side surface member 48 shown in FIG. 13 is used in place of the core side surface member 45 shown in FIG. 11, the same effect can be expected. The core-side surface member 48 is formed on the molding surface 15 without providing the back wall 21 with a space behind the molding surface 15.
A pair of opposed walls 49, 49 are provided on the opposite side to the above to form a closed heating gap 50, and a heater is provided in this heating gap 50.
It is an interior of 23. Then, the core side surface member 48
A cooling water pipe 27 and an air supply pipe 29 are provided so as to penetrate through the heating gap 50 of FIG.
【００３９】次に、図14には図１に示す発泡合成樹脂成
形品１を成形する型内発泡成形用金型10の他の具体例を
示している。これは、コア金型12の成形面15全面を発泡
性合成樹脂原料粒子の融点以上に加熱する加熱手段19を
コア金型12の加熱室17の成形面15背後に設けた取付凹部
51に多数の内部に加熱オイル等の加熱媒体を流動させた
加熱カートリッジ52の一端を取付けて構成したものであ
る。尚、図中53は加熱カートリッジ52の加熱オイル等の
加熱媒体の供給側に連結したこれの供給配管、54は排出
側に連結したこれの排出配管である。そして、加熱カー
トリッジ52は供給配管53と排出配管54に並列に配設され
ている。又、55は成形用金型10外部に設けた加熱オイル
等の加熱媒体を加熱する加熱槽を示している。この加熱
槽55には、適宜な加熱源が内装されたり、外装されてい
る。そして、供給配管53と排出配管54の加熱カートリッ
ジ52と反対側の端部は加熱槽55にのぞませている。尚、
56、57はそれぞれ供給配管53と排出配管54の途中に設け
たバルブである。Next, FIG. 14 shows another specific example of the in-mold foam molding die 10 for molding the foam synthetic resin molded product 1 shown in FIG. This is a mounting recess in which heating means 19 for heating the entire molding surface 15 of the core mold 12 to a temperature above the melting point of the expandable synthetic resin raw material particles is provided behind the molding surface 15 of the heating chamber 17 of the core mold 12.
One end of a heating cartridge 52, in which a heating medium such as heating oil is made to flow, is attached to a large number of insides of the 51, and is configured. In the figure, 53 is a supply pipe connected to the supply side of a heating medium such as heating oil of the heating cartridge 52, and 54 is a discharge pipe connected to the discharge side. The heating cartridge 52 is arranged in parallel with the supply pipe 53 and the discharge pipe 54. Reference numeral 55 denotes a heating tank provided outside the molding die 10 for heating a heating medium such as heating oil. In this heating tank 55, an appropriate heating source is installed inside or outside. The ends of the supply pipe 53 and the discharge pipe 54 opposite to the heating cartridge 52 are seen in the heating tank 55. still,
Reference numerals 56 and 57 are valves provided in the middle of the supply pipe 53 and the discharge pipe 54, respectively.
【００４０】ところで、こうした成形用金型10では、図
10に示す成形用金型10でも同様であるが、型内発泡成形
過程でコア金型12の成形面15全面に原料粒子が溶融して
溶融樹脂層が形成された後、これが硬化して表面硬化層
２が形成される関係上、この溶融樹脂層が形成された後
では、コア金型12側から成形空間13内に充填された原料
粒子を加熱させることができない問題がある。このた
め、この成形用金型10では、図15、図16に示すようにキ
ャビティ金型11側から成形空間13内に充填された原料粒
子を充分に加熱することを目的として、キャビティ金型
11の加熱室16内の成形面14背後を二区画させる区画壁58
を設けて、この加熱室16を第１区画加熱室16Ａと第２区
画加熱室16Ｂに区画するとともに、これら第１、第２区
画加熱室16Ａ、16Ｂに連通させてそれぞれ蒸気管25Ａ、
25Ｂとドレン管30Ａ、30Ｂを独自に設けている。尚、図
中59Ａ、59Ｂ、37Ａ、37Ｂは第１、第２区画加熱室16
Ａ、16Ｂに連通させて設けた蒸気管25Ａ、25Ｂとドレン
管30Ａ、30Ｂのそれぞれ途中に設けたバルブである。
又、24はキャビティ金型11の成形面14と加熱室16を連通
させる通気口を示している。By the way, in such a molding die 10, as shown in FIG.
The same applies to the molding die 10 shown in FIG. 10, but after the raw material particles are melted to form a molten resin layer on the entire molding surface 15 of the core die 12 in the in-mold foam molding process, this is cured and the surface Due to the formation of the hardened layer 2, there is a problem that the raw material particles filled in the molding space 13 cannot be heated from the core mold 12 side after the molten resin layer is formed. Therefore, in this molding die 10, as shown in FIGS. 15 and 16, the cavity mold is used for the purpose of sufficiently heating the raw material particles filled in the molding space 13 from the cavity mold 11 side.
Partition wall 58 that divides the back of the molding surface 14 into the heating chamber 16 of 11
Is provided to partition the heating chamber 16 into a first compartment heating chamber 16A and a second compartment heating chamber 16B, and communicate with the first compartment heating chamber 16A and the second compartment heating chamber 16B respectively, and a steam pipe 25A,
25B and drain tubes 30A and 30B are independently provided. In the figure, 59A, 59B, 37A and 37B are the first and second compartment heating chambers 16
These are valves provided in the middle of the steam pipes 25A and 25B and the drain pipes 30A and 30B which are provided so as to communicate with A and 16B, respectively.
In addition, reference numeral 24 denotes a ventilation port that connects the molding surface 14 of the cavity mold 11 and the heating chamber 16 to each other.
【００４１】次に、加熱カートリッジ52は、図17に示す
ように両端が側板60、60で閉止された円筒状の筒状本体
61のほぼ軸心上に沿って流入配管62を図中左側の一端の
側板60外部から内部に図中右側の他端の側板60との間に
間隔を残して貫通挿入させ、筒状本体61の流入配管62を
貫通させた一端の側板60に沿った筒状本体61に流出配管
63を外部から内部にのぞませて設けるとともに、図示し
たように筒状本体61内面と流入配管62外面間にスパイラ
ル状の隔壁64を形成して流入配管62の挿入端と流出配管
63の開口端を連通させる流動通路65を設け、流入配管62
から流動通路65を通じて流出配管63に加熱オイル等の加
熱媒体を流動させたものである。こうした加熱カートリ
ッジ52は、その態様上、少なくとも筒状本体61は熱伝導
が良好な銅、アルミニウムから形成されている。Next, as shown in FIG. 17, the heating cartridge 52 is a cylindrical tubular body whose both ends are closed by side plates 60, 60.
The inflow pipe 62 is inserted substantially along the axis of 61 from the outside of the side plate 60 at one end on the left side in the figure to the inside and the side plate 60 at the other end on the right side in the figure with a gap left between them to form a tubular body 61. Outflow pipe to the cylindrical main body 61 along the side plate 60 at one end through which the inflow pipe 62 of
63 is provided from outside to inside, and as shown in the drawing, a spiral partition 64 is formed between the inner surface of the tubular body 61 and the outer surface of the inflow pipe 62 to form the insertion end of the inflow pipe 62 and the outflow pipe.
A flow passage 65 is provided to connect the open end of 63 to the inflow pipe 62.
A heating medium such as heating oil is caused to flow through the flow passage 65 to the outflow pipe 63. In this heating cartridge 52, at least the cylindrical main body 61 is formed of copper or aluminum having good heat conduction in terms of its aspect.
【００４２】ここで、加熱オイルとしては、シリコンオ
イル、アルキルジフェニル等が利用できる。Here, as the heating oil, silicone oil, alkyldiphenyl, etc. can be used.
【００４３】そして、この成形用金型10では、キャビテ
ィ金型11の成形面14背後の加熱室16に蒸気を供給して、
これを通常の発泡成形温度に加熱し、成形空間13内の原
料粒子を発泡融着させるとき、先ず第１区画加熱室16Ａ
の蒸気管25Ａのバルブ59Ａと第２区画加熱室16Ｂのドレ
ン管30Ｂのバルブ37Ａを開放させるとともに、第２区画
加熱室16Ｂの蒸気管25Ｂのバルブ59Ｂと第１区画加熱室
16Ａのドレン管30Ａのバルブ37Ａを閉止させて、第１区
画加熱室16Ａの蒸気管25Ａから蒸気を供給して、第１区
画加熱室16Ａから成形空間13を通じて第２区画加熱室16
Ｂに蒸気を通す操作を行う。次に、開放側のバルブ59
Ａ、37Ｂを閉止させるとともに、閉止側のバルブ59Ｂ、
37Ａを開放させて、今度は逆に第２区画加熱室16Ｂから
成形空間13を通じて第１区画加熱室16Ａに蒸気を通す操
作を行う。最後に、第１、第２区画加熱室16Ａ、16Ｂの
蒸気管25Ａ、25Ｂのバルブ59Ａ、59Ｂを共に開放させる
とともに、ドレン管30Ａ、30Ｂのバルブ37Ａ、37Ｂを共
に閉止させて、両蒸気管28Ａ、28Ｂのいずれか一方から
第１、第２区画加熱室16Ａ、16Ｂの他方に蒸気を供給す
る操作を一回だけ、又は複数回繰返す。こうして、成形
空間13内の原料粒子をキャビティ金型11側からの片面加
熱で充分に発泡融着させるのである。In the molding die 10, steam is supplied to the heating chamber 16 behind the molding surface 14 of the cavity die 11,
When this is heated to a normal foam molding temperature to foam-melt the raw material particles in the molding space 13, first, the first compartment heating chamber 16A
The valve 59A of the steam pipe 25A and the valve 37A of the drain pipe 30B of the second compartment heating chamber 16B are opened, and the valve 59B of the steam pipe 25B of the second compartment heating chamber 16B and the first compartment heating chamber are opened.
The valve 37A of the drain pipe 30A of 16A is closed, steam is supplied from the steam pipe 25A of the first compartment heating chamber 16A, and the second compartment heating chamber 16 is passed from the first compartment heating chamber 16A through the molding space 13.
Perform the operation of passing steam through B. Then open valve 59
A and 37B are closed, and the closing valve 59B,
37A is opened, and, conversely, the operation of passing steam from the second compartment heating chamber 16B through the molding space 13 to the first compartment heating chamber 16A is performed. Finally, the valves 59A, 59B of the steam pipes 25A, 25B of the first and second compartment heating chambers 16A, 16B are both opened, and the valves 37A, 37B of the drain pipes 30A, 30B are closed together, so that both steam pipes are closed. The operation of supplying steam from one of 28A and 28B to the other of the first and second compartment heating chambers 16A and 16B is repeated only once or a plurality of times. In this way, the raw material particles in the molding space 13 are sufficiently foamed and fused by heating one side from the cavity mold 11 side.
【００４４】又、図18には図１に示す発泡合成樹脂成形
品１を成形する型内発泡成形用金型10の更に他の具体例
を示している。これは、加熱手段19をコア金型12の成形
面15背後の加熱室17に輻射加熱源66を設けて構成したも
のである。この輻射加熱源66は、図示したように加熱状
態を維持したまま、退避手段67に沿って成形面15背後か
ら退避可能な態様に設けられたり、又はその背後に固定
的に設けられている。そして、この輻射加熱源66はオイ
ルヒーター、ガスバーナー等を成形面15背後に向けて設
けたものである。FIG. 18 shows still another specific example of the in-mold foam molding die 10 for molding the foam synthetic resin molded product 1 shown in FIG. In this, the heating means 19 is configured by providing a radiant heating source 66 in a heating chamber 17 behind the molding surface 15 of the core mold 12. The radiant heating source 66 is provided so as to be able to retract from the rear of the molding surface 15 along the retracting means 67 while keeping the heating state as shown in the figure, or fixedly provided behind it. The radiant heating source 66 is provided with an oil heater, a gas burner, etc. facing the back of the molding surface 15.
【００４５】更に、図１に示す発泡合成樹脂成形品１は
図19、図20、図21に概略を示す他の型内発泡成形用金型
10を利用しても成形することができる。先ず、図19には
型開きさせた一対のキャビティ金型11とコア金型12間に
コア金型12の成形面15を加熱する加熱手段68を侵入可能
に設けたものを示している。又、この加熱手段68は一対
のキャビティ金型11とコア金型12の型閉め前に、両者の
間から退避可能な態様になっている。そして、この加熱
手段68は図18に示すのと同様に輻射加熱源が利用され
る。次に、図20、図21にはコア金型12の成形面15を加熱
する加熱手段69に、一対のキャビティ金型11とコア金型
12の外部に設けた加熱オイル等の加熱媒体70を入れた加
熱槽71を利用するものを示している。ここに示すのは、
いずれも一対のキャビティ金型11とコア金型12を型開き
させた後、コア金型12を、又はコア金型12と加熱槽71を
共に移動させ、コア金型12の成形面15を加熱槽71内の加
熱オイル等の加熱媒体70に浸漬させて加熱するものであ
る。Furthermore, the foamed synthetic resin molded article 1 shown in FIG. 1 is another in-mold foam molding die schematically shown in FIGS. 19, 20 and 21.
It can also be molded by using 10. First, FIG. 19 shows a structure in which a heating means 68 for heating the molding surface 15 of the core mold 12 is provided between the cavity mold 11 and the core mold 12 that have been opened so as to be able to enter. Further, the heating means 68 is configured so that it can be retracted from between the cavity mold 11 and the core mold 12 before the mold is closed. As the heating means 68, a radiant heating source is used as in the case shown in FIG. Next, in FIG. 20 and FIG. 21, the heating means 69 for heating the molding surface 15 of the core mold 12 includes a pair of cavity mold 11 and core mold.
A heating tank 71 containing a heating medium 70 such as heating oil provided outside of 12 is used. Shown here is
After opening the pair of cavity mold 11 and core mold 12 in both cases, the core mold 12 or the core mold 12 and the heating tank 71 are moved together to heat the molding surface 15 of the core mold 12. It is heated by immersing it in a heating medium 70 such as heating oil in a tank 71.
【００４６】[0046]
【発明の効果】以上のような本発明に係る成形方法で成
形された発泡合成樹脂成形品は、その表面の一部又は全
面に発泡性合成樹脂原料粒子を溶融させて溶融樹脂層を
形成した後、この溶融樹脂層を硬化させて形成された連
続した表面硬化層が均一に形成されているから、表面強
度が高くなって、通常の発泡合成樹脂成形品の用途や使
用状態によっては欠点を改善することができる。又、表
面に他の物が擦れたり、当たっても、簡単に剥離現象や
陥没現象が発生することもないのである。更に、表面硬
化層が形成されることで、表面は美麗な状態のものとな
る。そして、このような成形品を成形する場合、従来の
発泡成形機をそのまま使用し、型内発泡成形用金型の一
部をわずかに変更するだけで対応できるので、工業的に
きわめて有用である。The foamed synthetic resin molded article molded by the molding method according to the present invention as described above has the molten resin layer formed by melting the expandable synthetic resin raw material particles on a part or the entire surface thereof. After that, since a continuous surface-hardened layer formed by hardening this molten resin layer is uniformly formed, the surface strength becomes high, and there are drawbacks depending on the application and use condition of the ordinary foamed synthetic resin molded product. Can be improved. Further, even if the surface is rubbed or hit with another object, the peeling phenomenon or the depression phenomenon does not easily occur. Furthermore, the surface becomes beautiful by forming the surface-hardened layer. When molding such a molded product, the conventional foam molding machine can be used as it is, and it can be dealt with by slightly changing a part of the in-mold foam molding die, which is extremely useful industrially. .
【００４７】又、こうした成形方法では、型内発泡成形
過程で原料粒子を溶融させて表面硬化層を形成するか
ら、通常の発泡成形操作をわずかに変更するだけで対応
でき、成形作業が効率的に行えるだけでなく、表面硬化
層にしわを生じるおそれもないのである。更に、溶融樹
脂層を形成する過程において、成形面の原料粒子の融点
以上に加熱した部分に原料粒子を少なくとも一時期、こ
こに一対の金型間に充填した原料粒子を強制的に押圧し
ながら接触させることで、表面硬化層が形成されない部
分が残って、連続した表面硬化層が均一に形成されなか
ったり、表面硬化層と背後の発泡融着した原料粒子の間
に空隙が形成される問題も回避できる。そして、表面硬
化層の厚みは、原料粒子の発泡倍率と一対の金型間に原
料粒子を充填するときに残す間隙幅から一般的なクラッ
キング間隙幅を除いた間隙幅の関係に応じて自由に決定
することが可能となる。Further, in such a molding method, since the raw material particles are melted in the in-mold foam molding process to form the surface-hardened layer, the ordinary foam molding operation can be carried out by slightly changing the molding operation, and the molding operation is efficient. Not only can this be done, but there is no risk of wrinkles on the surface-hardened layer. Further, in the process of forming the molten resin layer, the raw material particles are contacted while forcibly pressing the raw material particles filled between a pair of molds to the portion of the molding surface heated to the melting point or higher of the raw material particles at least for a period of time. By doing so, there is a problem that a part where the surface-hardened layer is not formed remains, and a continuous surface-hardened layer is not formed uniformly, or a void is formed between the surface-hardened layer and the foam-bonded raw material particles behind. It can be avoided. The thickness of the surface-hardened layer can be freely set according to the relationship between the expansion ratio of the raw material particles and the gap width left between the pair of molds when the raw material particles are filled with the general cracking gap width. It becomes possible to decide.
【００４８】又、成形用金型の成形面の表面硬化層を形
成しようとする部分に適宜な模様を彫込んだり、網状物
等を設ける等の工夫をすることで、この表面硬化層に各
種意匠を付与したり、艶消し状態にすれば、商品価値を
より高めることもできる。Further, by devising a suitable pattern on the portion of the molding surface of the molding die where the surface-hardened layer is to be formed, or by providing a net or the like, various types of surface-hardened layers can be obtained. The product value can be further enhanced by adding a design or by providing a matte state.
【図１】本発明に係る発泡合成樹脂成形品の一例を示す
斜視図FIG. 1 is a perspective view showing an example of a foamed synthetic resin molded product according to the present invention.
【図２】この成形品の組織を模式的に示す説明図FIG. 2 is an explanatory view schematically showing the structure of this molded product.
【図３】この成形品の組織を模式的に示す説明図FIG. 3 is an explanatory view schematically showing the structure of this molded product.
【図４】本発明に係る成形品の組織を２０倍に拡大して
示す説明図FIG. 4 is an explanatory view showing the structure of a molded product according to the present invention with a magnification of 20 times.
【図５】本発明に係る成形品の組織を２０倍に拡大して
示す説明図FIG. 5 is an explanatory view showing the structure of a molded product according to the present invention in a magnified 20-fold manner.
【図６】本発明に係る成形方法を説明する型内発泡成形
用金型の概略を示す説明図FIG. 6 is an explanatory view schematically showing an in-mold foam molding die for explaining the molding method according to the present invention.
【図７】この成形用金型の作動状態を示す説明図FIG. 7 is an explanatory view showing an operating state of this molding die.
【図８】本発明に係る他の成形品の組織を模式的に示す
説明図FIG. 8 is an explanatory view schematically showing the structure of another molded product according to the present invention.
【図９】本発明に係る他の成形方法を説明する型内発泡
成形用金型の概略を示す説明図FIG. 9 is an explanatory view showing the outline of an in-mold foam molding die for explaining another molding method according to the present invention.
【図10】本発明に係る型内発泡成形用金型の具体例を示
す断面図FIG. 10 is a cross-sectional view showing a specific example of a mold for foam molding according to the present invention.
【図11】この成形用金型に組込むコア側表面部材の一例
を示す断面図FIG. 11 is a cross-sectional view showing an example of a core-side surface member incorporated in this molding die.
【図12】この成形用金型の要部を示す断面図FIG. 12 is a cross-sectional view showing the main parts of this molding die.
【図13】コア側表面部材の他の例を示す断面図FIG. 13 is a cross-sectional view showing another example of the core-side surface member.
【図14】本発明に係る型内発泡成形用金型の他の具体例
を示す断面図FIG. 14 is a cross-sectional view showing another specific example of the in-mold foam molding die according to the present invention.
【図15】この成形用金型のキャビティ金型の背面側を示
す断面図FIG. 15 is a cross-sectional view showing the back side of a cavity mold of this molding mold.
【図16】この成形用金型のキャビティ金型の背面側を示
す断面斜視図FIG. 16 is a sectional perspective view showing the back side of the cavity mold of this molding mold.
【図17】加熱カートリッジを示す断面図FIG. 17 is a sectional view showing a heating cartridge.
【図18】本発明に係る型内発泡成形用金型の更に他の具
体例の概略を示す説明図FIG. 18 is an explanatory view showing the outline of still another specific example of the in-mold foam molding die according to the present invention.
【図19】本発明に係る成形方法で用いる他の型内発泡成
形用金型の概略を示す説明図FIG. 19 is an explanatory view showing the outline of another in-mold foam molding die used in the molding method according to the present invention.
【図20】本発明に係る成形方法で用いる他の型内発泡成
形用金型の概略を示す説明図FIG. 20 is an explanatory view showing the outline of another in-mold foam molding die used in the molding method according to the present invention.
【図21】本発明に係る成形方法で用いる他の型内発泡成
形用金型の概略を示す説明図FIG. 21 is an explanatory view schematically showing another in-mold foam molding die used in the molding method according to the present invention.
１ 成形品 ２ 表面硬化層 ３ 原料粒子 ４ 表皮 ５ セル ６ セル膜 ７ 気泡 10 型内発泡成形用金型 11 キャビティ金型 12 コア金型 13 成形空間 14 成形面 15 成形面 16 加熱室 17 加熱室 18 原料充填フィダー 19 加熱手段 20 加熱手段 21 背面壁 22 加熱間隙 23 ヒーター 24 通気口 25 蒸気管 26 冷却水管 27 冷却水管 28 送気管 29 送気管 30 ドレン管 31 ドレン管 32 離型ピン 33 噴射ノズル 34 噴射ノズル 35 送気口 36 送気口 39 バックプレート 40 バックプレート 41 側プレート 42 側プレート 43 インナープレート 44 キャビティ側表面部材 45 コア側表面部材 46 通気間隙 47 接合構造 48 コア側表面部材 49 対向壁 50 加熱間隙 51 取付凹部 52 加熱カートリッジ 53 供給配管 54 排出配管 55 加熱槽 56 バルブ 57 バルブ 58 区画壁 59Ａ、Ｂ バルブ 60 側板 61 筒状本体 62 流入配管 63 流出配管 64 隔壁 65 流動通路 66 輻射加熱源 67 退避手段 68 加熱手段 69 加熱手段 70 加熱媒体 71 加熱槽 1 Molded Product 2 Surface Hardened Layer 3 Raw Material Particle 4 Skin 5 Cell 6 Cell Membrane 7 Bubble 10 In-mold Foaming Mold 11 Cavity Mold 12 Core Mold 13 Molding Space 14 Molding Surface 15 Molding Surface 16 Heating Chamber 17 Heating Chamber 18 Raw material filling feeder 19 Heating means 20 Heating means 21 Back wall 22 Heating gap 23 Heater 24 Vent 25 Steam pipe 26 Cooling water pipe 27 Cooling water pipe 28 Air feeding pipe 29 Air feeding pipe 30 Drain pipe 31 Drain pipe 32 Release pin 33 Injection nozzle 34 Injection nozzle 35 Air inlet 36 Air inlet 39 Back plate 40 Back plate 41 Side plate 42 Side plate 43 Inner plate 44 Cavity side surface member 45 Core side surface member 46 Ventilation gap 47 Joint structure 48 Core side surface member 49 Opposed wall 50 Heating gap 51 Mounting recess 52 Heating cartridge 53 Supply pipe 54 Discharge pipe 55 Heating tank 56 Valve 57 Valve 58 Partition wall 59 A, B valve 60 Side plate 61 Cylindrical body 62 Inflow pipe 63 Flow Pipe 64 partition wall 65 flow path 66 radiant heat source 67 retracting means 68 heating means 69 heating means 70 heating medium 71 heating tank
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.5 識別記号 庁内整理番号 ＦＩ 技術表示箇所 Ｂ２９Ｋ 25:00 105:04 ─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. 5 Identification code Office reference number FI technical display area B29K 25:00 105: 04
Claims (16)
泡性合成樹脂原料粒子の融点以上に加熱した部分に対応
した成形品表面に、この成形面の加熱した部分に原料粒
子を接触させて溶融させ、その部分に溶融樹脂層を形成
した後、この溶融樹脂層を硬化させて連続した表面硬化
層を型内発泡成形過程で形成した発泡合成樹脂成形品。1. The raw material particles are brought into contact with the heated portion of the molding surface, which corresponds to the portion of the molding surface of the in-mold foam molding die that has been heated above the melting point of the expandable synthetic resin raw material particles. A foamed synthetic resin molded product in which a molten resin layer is formed by melting and melting the resin, and then the molten resin layer is cured to form a continuous surface-hardened layer in the in-mold foam molding process.
泡性合成樹脂原料粒子の融点以上に加熱した部分に対応
した成形品表面に、この成形面の加熱した部分に原料粒
子を少なくとも一時期、ここに成形用金型内に充填した
原料粒子を強制的に押圧しながら接触させて溶融させ、
その部分に溶融樹脂層を形成した後、この溶融樹脂層を
硬化させて連続した表面硬化層を型内発泡成形過程で形
成した発泡合成樹脂成形品。2. The surface of the molded article corresponding to the portion of the molding surface of the in-mold foam molding die that has been heated to above the melting point of the expandable synthetic resin raw material particles, and the raw material particles are at least temporarily provided in the heated portion of this molding surface. , Here, the raw material particles filled in the molding die are forcedly pressed into contact with each other to melt,
A foamed synthetic resin molded article obtained by forming a molten resin layer on that portion and then curing the molten resin layer to form a continuous surface-hardened layer in the in-mold foam molding process.
粒子の境界部分で、表面硬化層の一部を原料粒子の一部
が溶融して形成し、表面硬化層と背後の原料粒子が接着
した請求項１又は２記載の発泡合成樹脂成形品。3. The surface-hardened layer and the raw material particles at the back are formed by melting a part of the raw material particles at a boundary portion between the surface-hardened layer and the foamable synthetic resin raw material particles at the back. The foamed synthetic resin molded article according to claim 1, which is adhered.
した状態で存在した請求項１〜３記載の発泡合成樹脂成
形品。4. The foamed synthetic resin molded article according to claim 1, wherein air bubbles are present inside the surface-hardened layer in an independent and dispersed state.
平になった請求項４記載の発泡合成樹脂成形品。5. The foamed synthetic resin molded article according to claim 4, wherein a large number of bubbles are flattened in the thickness direction of the surface-hardened layer.
チレン系樹脂原料粒子又は発泡性ポリオレフィン系樹脂
原料粒子の中から選択された請求項１〜５記載の発泡合
成樹脂成形品。6. The expanded synthetic resin molded article according to claim 1, wherein the expandable synthetic resin raw material particles are selected from expandable polystyrene resin raw material particles or expandable polyolefin resin raw material particles.
用金型の成形面の一部又は全面をその型閉めした内部に
充填する発泡性合成樹脂原料粒子の融点以上に加熱する
工程と、一般的なクラッキング間隙より大きな間隙を残
して型閉めした一対の金型間に原料粒子を充填する工程
と、成形面の原料粒子の融点以上に加熱した部分に原料
粒子を接触させて溶融させ、この部分に溶融樹脂層を形
成する工程と、溶融樹脂層を硬化させて成形品表面に対
応する部分に連続した表面硬化層を形成する工程よりな
る型内発泡成形過程で成形品表面に原料粒子から表面硬
化層を形成することを特徴とした発泡合成樹脂成形品の
成形方法。7. A step of heating part or all of the molding surface of an in-mold foam molding die composed of a pair of dies to a temperature not lower than the melting point of the expandable synthetic resin raw material particles to be filled inside the closed mold. And the step of filling the raw material particles between a pair of molds that are closed with a gap larger than the general cracking gap, and melting the raw material particles by contacting the portion of the molding surface heated above the melting point of the raw material particles. Then, the molten resin layer is formed on this part, and the molten resin layer is cured to form a continuous surface hardened layer on the part corresponding to the molded product surface. A method for molding a foamed synthetic resin molded article, which comprises forming a surface-hardened layer from raw material particles.
用金型の成形面の一部又は全面をその型閉めした内部に
充填する発泡性合成樹脂原料粒子の融点以上に加熱する
工程と、一般的なクラッキング間隙より大きな間隙を残
して型閉めした一対の金型間に原料粒子を充填する工程
と、成形面の原料粒子の融点以上に加熱した部分に原料
粒子を少なくとも一時期、ここに一対の金型間に充填し
た原料粒子を強制的に押圧しながら接触させて溶融さ
せ、この部分に溶融樹脂層を形成する工程と、溶融樹脂
層を硬化させて成形品表面に対応する部分に連続した表
面硬化層を形成する工程よりなる型内発泡成形過程で成
形品表面に原料粒子から表面硬化層を形成することを特
徴とした発泡合成樹脂成形品の成形方法。8. A step of heating part or all of the molding surface of an in-mold foam molding die composed of a pair of molds to a temperature not lower than the melting point of the expandable synthetic resin raw material particles to be filled inside the closed mold. And a step of filling the raw material particles between a pair of molds closed with a gap larger than a general cracking gap, and the raw material particles in a portion of the molding surface heated above the melting point of the raw material particles at least temporarily, The raw material particles filled between the pair of dies are pressed and brought into contact with each other to be melted, and a step of forming a molten resin layer on this portion, and a portion corresponding to the surface of the molded product by curing the molten resin layer A method for molding a foamed synthetic resin molded article, characterized in that a surface-hardened layer is formed from raw material particles on the surface of the molded article in the in-mold foam molding step, which comprises the step of forming a continuous surface-hardened layer.
原料粒子の融点以上に加熱する工程を他の工程に先立っ
て開始させ、この成形面の加熱した部分に溶融樹脂層を
形成する工程を一対の金型間に原料粒子を充填する工程
と同時に開始させる請求項７又は８記載の発泡合成樹脂
成形品の成形方法。9. A step of heating a part or all of the molding surface to a temperature equal to or higher than the melting point of the expandable synthetic resin raw material particles is started prior to other steps, and a molten resin layer is formed on the heated part of the molding surface. The method for molding a foamed synthetic resin molded article according to claim 7 or 8, wherein the step is started simultaneously with the step of filling the raw material particles between a pair of molds.
子を充填する工程の後に、一対の金型を完全に型閉めす
る工程を行うとともに、成形面の加熱した部分に溶融樹
脂層を形成する工程を、一対の金型間に原料粒子を充填
する工程から、次の一対の金型を完全に型閉めする工程
の終了後も引続いて、所要時間継続させて行わせる請求
項９記載の発泡合成樹脂成形品の成形方法。10. A step of completely closing the pair of molds is performed after the step of filling the expandable synthetic resin raw material particles between the pair of molds, and a molten resin layer is formed on the heated portion of the molding surface. The step of forming is continued from the step of filling the raw material particles between a pair of molds with the time required after the step of completely closing the next pair of molds. A method for molding the foamed synthetic resin molded article described.
対応する部分に連続した表面硬化層を形成する工程の後
に、通常の発泡成形の工程を行わせる請求項７〜１０記
載の発泡合成樹脂成形品の成形方法。11. The foam synthesis according to claim 7, wherein after the step of curing the molten resin layer to form a continuous surface-hardened layer at the portion corresponding to the surface of the molded article, a normal foam molding step is performed. Molding method for resin molded products.
３〜１５０倍の範囲内のものを用いる請求項７〜１１記
載の発泡合成樹脂成形品の成形方法。12. The method for molding a foamed synthetic resin molded article according to claim 7, wherein the foamable synthetic resin raw material particles have a foaming ratio of 3 to 150 times.
る表面硬化層の厚みが０．１〜５．０ｍｍである請求項
７〜１２記載の発泡合成樹脂成形品の成形方法。13. The method for molding a foamed synthetic resin molded article according to claim 7, wherein the surface-hardened layer formed in a portion corresponding to the surface of the molded article has a thickness of 0.1 to 5.0 mm.
スチレン系樹脂原料粒子又は発泡性ポリオレフィン系樹
脂原料粒子の中から選択して用いる請求項７〜１３記載
の発泡合成樹脂成形品の成形方法。14. The method for molding a foamed synthetic resin molded article according to claim 7, wherein the foamable synthetic resin material particles are selected from foamable polystyrene resin material particles or foamable polyolefin resin material particles and used.
形用金型で、成形面の一部又は全面背後に、この部分を
その型閉めした内部に充填する発泡性合成樹脂原料粒子
の融点以上に加熱する加熱手段を設けた型内発泡成形用
金型。15. An in-mold foam molding mold comprising a pair of molds, wherein a part of the molding surface or the entire rear surface of the molding surface is filled with the expandable synthetic resin raw material particles. Mold for in-mold foam molding provided with heating means for heating above the melting point.
原料粒子の融点以上に加熱する部分背後に閉鎖状に設け
た加熱間隙内にヒーターを内装させて構成された請求項
１５記載の型内発泡成形用金型。16. The mold according to claim 15, wherein the heating means is configured by incorporating a heater in a heating gap provided in a closed shape behind a portion of the molding surface which is heated above the melting point of the expandable synthetic resin raw material particles. Inner foaming mold.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11680292A JP3189377B2 (en) | 1991-04-08 | 1992-04-08 | Molding method of foamed synthetic resin molded product |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3-103802 | 1991-04-08 | ||
| JP10380291 | 1991-04-08 | ||
| JP11680292A JP3189377B2 (en) | 1991-04-08 | 1992-04-08 | Molding method of foamed synthetic resin molded product |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH05124126A true JPH05124126A (en) | 1993-05-21 |
| JP3189377B2 JP3189377B2 (en) | 2001-07-16 |
Family
ID=26444388
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11680292A Expired - Fee Related JP3189377B2 (en) | 1991-04-08 | 1992-04-08 | Molding method of foamed synthetic resin molded product |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3189377B2 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0621930U (en) * | 1992-08-26 | 1994-03-22 | 三菱油化バーディッシェ株式会社 | Thermoplastic foam resin molding |
| JP2009286030A (en) * | 2008-05-30 | 2009-12-10 | Asahi Kasei Kk | Foamed resin material |
| JP2011110836A (en) * | 2009-11-27 | 2011-06-09 | Asahi Kasei Kk | Foaming resin container |
| WO2019198642A1 (en) * | 2018-04-09 | 2019-10-17 | 旭化成株式会社 | Foam molding and method for producing same |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6042581B1 (en) | 2015-08-04 | 2016-12-14 | 大洋紙業株式会社 | Packing body and packing method |
| KR20230039027A (en) | 2021-09-13 | 2023-03-21 | (주)패커 | Packaging assembly for packaging article and method for packaging article using the same |
-
1992
- 1992-04-08 JP JP11680292A patent/JP3189377B2/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0621930U (en) * | 1992-08-26 | 1994-03-22 | 三菱油化バーディッシェ株式会社 | Thermoplastic foam resin molding |
| JP2009286030A (en) * | 2008-05-30 | 2009-12-10 | Asahi Kasei Kk | Foamed resin material |
| JP2011110836A (en) * | 2009-11-27 | 2011-06-09 | Asahi Kasei Kk | Foaming resin container |
| WO2019198642A1 (en) * | 2018-04-09 | 2019-10-17 | 旭化成株式会社 | Foam molding and method for producing same |
| KR20200067184A (en) * | 2018-04-09 | 2020-06-11 | 아사히 가세이 가부시키가이샤 | Foamed molded body and method for manufacturing same |
| JPWO2019198642A1 (en) * | 2018-04-09 | 2020-12-03 | 旭化成株式会社 | Foam molded product and its manufacturing method |
| US11235553B2 (en) | 2018-04-09 | 2022-02-01 | Asahi Kasei Kabushiki Kaisha | Foam molded product and method of producing same |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3189377B2 (en) | 2001-07-16 |
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