JPH0688314B2 - Method for manufacturing biaxially stretched blow container - Google Patents
Method for manufacturing biaxially stretched blow containerInfo
- Publication number
- JPH0688314B2 JPH0688314B2 JP2270914A JP27091490A JPH0688314B2 JP H0688314 B2 JPH0688314 B2 JP H0688314B2 JP 2270914 A JP2270914 A JP 2270914A JP 27091490 A JP27091490 A JP 27091490A JP H0688314 B2 JPH0688314 B2 JP H0688314B2
- Authority
- JP
- Japan
- Prior art keywords
- molded product
- container
- primary molded
- molding
- blow
- 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.)
- Expired - Lifetime
Links
- 238000004519 manufacturing process Methods 0.000 title claims description 6
- 238000000034 method Methods 0.000 title description 10
- 239000000047 product Substances 0.000 claims description 47
- 238000010438 heat treatment Methods 0.000 claims description 26
- IKHGUXGNUITLKF-UHFFFAOYSA-N Acetaldehyde Chemical compound CC=O IKHGUXGNUITLKF-UHFFFAOYSA-N 0.000 claims description 20
- -1 polyethylene terephthalate Polymers 0.000 claims description 9
- 229920000139 polyethylene terephthalate Polymers 0.000 claims description 9
- 239000005020 polyethylene terephthalate Substances 0.000 claims description 9
- 238000000071 blow moulding Methods 0.000 claims description 8
- 239000012467 final product Substances 0.000 claims description 4
- 238000007664 blowing Methods 0.000 claims description 3
- 238000002347 injection Methods 0.000 claims description 3
- 239000007924 injection Substances 0.000 claims description 3
- 238000007599 discharging Methods 0.000 claims description 2
- 238000000465 moulding Methods 0.000 description 18
- 238000007796 conventional method Methods 0.000 description 3
- 238000000354 decomposition reaction Methods 0.000 description 3
- 238000001746 injection moulding Methods 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 239000008157 edible vegetable oil Substances 0.000 description 2
- 229910052500 inorganic mineral Inorganic materials 0.000 description 2
- 239000011707 mineral Substances 0.000 description 2
- IKHGUXGNUITLKF-XPULMUKRSA-N acetaldehyde Chemical compound [14CH]([14CH3])=O IKHGUXGNUITLKF-XPULMUKRSA-N 0.000 description 1
- 235000013361 beverage Nutrition 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000003205 fragrance Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 239000012778 molding material Substances 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 239000013014 purified material Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 229920003002 synthetic resin Polymers 0.000 description 1
- 239000000057 synthetic resin Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
- B29C49/42—Component parts, details or accessories; Auxiliary operations
- B29C49/78—Measuring, controlling or regulating
- B29C49/783—Measuring, controlling or regulating blowing pressure
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
- B29C49/42—Component parts, details or accessories; Auxiliary operations
- B29C49/64—Heating or cooling preforms, parisons or blown articles
- B29C49/6409—Thermal conditioning of preforms
- B29C49/6418—Heating of preforms
- B29C49/642—Heating of preforms and shrinking of the preform
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
- B29C49/42—Component parts, details or accessories; Auxiliary operations
- B29C49/64—Heating or cooling preforms, parisons or blown articles
- B29C49/6472—Heating or cooling preforms, parisons or blown articles in several stages
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2949/00—Indexing scheme relating to blow-moulding
- B29C2949/07—Preforms or parisons characterised by their configuration
- B29C2949/0715—Preforms or parisons characterised by their configuration the preform having one end closed
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
- B29C49/02—Combined blow-moulding and manufacture of the preform or the parison
- B29C49/06—Injection blow-moulding
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
- B29C49/42—Component parts, details or accessories; Auxiliary operations
- B29C49/64—Heating or cooling preforms, parisons or blown articles
- B29C49/6604—Thermal conditioning of the blown article
- B29C49/6605—Heating the article, e.g. for hot fill
- B29C49/66055—Heating the article, e.g. for hot fill using special pressurizing during the heating, e.g. in order to control the shrinking
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C61/00—Shaping by liberation of internal stresses; Making preforms having internal stresses; Apparatus therefor
- B29C61/02—Thermal shrinking
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
Description
【発明の詳細な説明】 ［産業上の利用分野］ この発明は耐熱性等に優れた二軸延伸ブロー容器の製造
に利用できる方法に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a method that can be used for manufacturing a biaxially stretched blow container having excellent heat resistance and the like.
［従来の技術］ 一般に、二軸延伸ブロー容器と称される合成樹脂の薄肉
の包装容器は、射出または押出成形されたプリフォーム
を、金型内において軸方向に延伸するとともに、吹込ん
だ気体の圧力により横方向に膨張させて製造されてい
る。[Prior Art] Generally, a synthetic resin thin-walled packaging container, which is called a biaxially stretched blow container, is formed by injecting or extruding a preform that is axially stretched in a mold and blown with a gas. It is manufactured by expanding laterally by the pressure of.
このような成形法では、成形される容器の大きさや形状
などに合せてプリフォームの設計が行なわれるため、プ
リフォームは必然的に厚肉に設計される。この厚肉のプ
リフォームの課題は、射出成形時の冷却に時間を要する
ことと、延伸ブロー前のプリフォームの温調に手間を要
することであり、これらにより成形サイクルのタイム短
縮が図り難いということである。In such a molding method, the preform is designed according to the size and shape of the container to be molded, so that the preform is necessarily designed to be thick. The problems with this thick preform are that it takes time to cool during injection molding and that it takes time to adjust the temperature of the preform before stretch-blowing, which makes it difficult to shorten the molding cycle time. That is.
そこで、プリフォーム温調後の二軸延伸ブロー成形を、
一次成形−熱処理（加熱収縮）−最終成形の３工程と
し、一次成形品を最終成形品よりも大きく成形するとと
もに、一次成形品を対象としてプリフォームの設計を行
ない、これによりプリフォームの肉厚の薄化を可能とし
た成形方法が開発された。Therefore, the biaxial stretch blow molding after preform temperature control,
The three steps of primary molding-heat treatment (heat shrinkage) -final molding are performed, and the primary molded product is molded larger than the final molded product, and the preform is designed for the primary molded product. A molding method has been developed that enables thinning.
［発明が解決しようとする課題］ しかしながら、この成形方法では、一次成形品の加熱収
縮を制御する手段が講じられていないことから、収縮に
バラツキが大きく、これが原因で再ブロー成形時に偏肉
が起り、また耐熱性にもむらがあるなどの問題が生じ、
実用化には更に改良が必要とされている。[Problems to be Solved by the Invention] However, in this molding method, since there is no means for controlling the heat shrinkage of the primary molded product, there is a large variation in shrinkage, which causes uneven thickness during re-blow molding. And problems such as uneven heat resistance,
Further improvement is required for practical use.
また容器の素材がポリエチレンテレフタレートのときに
は、成形時にポリエチレンテレフタレートの分解生成物
であるアセトアルデヒドが発生する。When the material of the container is polyethylene terephthalate, acetaldehyde which is a decomposition product of polyethylene terephthalate is generated during molding.
このアセトアルデヒドは特有の芳香を持った有機物であ
るため、コーラ飲料、ミネラルウォーター、食用油など
の容器としては、できる限りアセトアルデヒドを除去し
て、内容物の味や香りが変化しないようにすることが望
まれている。This acetaldehyde is an organic substance with a unique fragrance, so for containers such as cola drinks, mineral water, and edible oil, it is necessary to remove acetaldehyde as much as possible so that the taste and aroma of the contents do not change. Is desired.
そこで、これまではプリフォームの成形に際して、ポリ
エチレンテレフタレートが分解しないように、射出装置
のスクリュ回転数を下げたり、或は射出スピードを遅く
したりして、樹脂の分解によるアセトアルデヒドの発生
を抑制しているが、未だ充分ではなく、内容物によって
は、容器のコスト高を承知で、高度に精製された材料を
使用している。Therefore, until now, during the molding of preforms, the screw rotation speed of the injection device was reduced or the injection speed was slowed to prevent the decomposition of polyethylene terephthalate to prevent the generation of acetaldehyde due to the decomposition of the resin. However, it is still not sufficient, and depending on the contents, the high cost of the container is known, and highly purified materials are used.
この発明は、そのよう問題を含めて上記二軸延伸ブロー
における課題を解決せんとするものであって、その目的
は、一次成形品の加熱処理に際する収縮を制御して、収
縮率にむらがなく、また熱処理によりアセトアルデヒド
が低減された容器を成形し得る新たな成形方法を提供す
ることにある。This invention intends to solve the above-mentioned problems in the biaxial stretching blow including such a problem, and the object thereof is to control the shrinkage during the heat treatment of the primary molded product to obtain a uniform shrinkage ratio. Another object of the present invention is to provide a new molding method capable of molding a container having no heat and reduced acetaldehyde by heat treatment.
［課題を解決するための手段］ 上記目的によるこの発明の１つの特徴は、プリフォーム
を延伸ブロー成形により容器の形態を有する一次成形品
に形成し、その一次成形品を熱処理により収縮させたの
ち容器にブロー成形するにあたり、上記熱処理に際し一
次成形品の内圧により収縮を制御することにある。[Means for Solving the Problems] One feature of the present invention according to the above-mentioned object is that a preform is formed by stretch blow molding into a primary molded product having a container shape, and the primary molded product is contracted by heat treatment. In blow-molding into a container, the shrinkage is controlled by the internal pressure of the primary molded product during the heat treatment.
また他の１つの特徴は、加熱及び収縮に伴なう一次成形
品内の昇圧は、一次成形品内の気体の排出により制御す
ることにある。Still another feature is that the pressure increase in the primary molded product due to heating and shrinkage is controlled by discharging the gas in the primary molded product.
さら他の１つ特徴は、ポリエチレンテレフタレートによ
るプリフォームの延伸ブローは、容積比で最終製品とな
る容器の1.2〜3.0倍までとし、一次成形品の熱処理によ
る収縮を280℃以下の温度により20〜120秒維持して行っ
て、ポリエチレンテレフタレートからのアセトアルデヒ
ドの発生を低減することにある。Another characteristic is that the stretch blow of the preform by polyethylene terephthalate is 1.2 to 3.0 times the volume of the container as the final product, and the shrinkage due to the heat treatment of the primary molded product is 20 to 20 depending on the temperature of 280 ° C or less. It is carried out for 120 seconds to reduce the generation of acetaldehyde from polyethylene terephthalate.
［作用］ 上記成形方法では、一次成形品内の気体の圧力により、
加熱による一次成形品の収縮が制限され、収縮に伴なう
縮小が均等に及んで再ブローにおいても肉厚分布が均一
化し、耐熱性が向上する。[Operation] In the above molding method, the pressure of the gas in the primary molded product causes
The shrinkage of the primary molded product due to heating is limited, the shrinkage caused by the shrinkage is evenly distributed, and the thickness distribution is uniform even in re-blowing, and the heat resistance is improved.
またプリフォームがポリエチレンテレフタレートの場合
には、アセトアルデヒドの発生が抑制されて低減する。When the preform is polyethylene terephthalate, the generation of acetaldehyde is suppressed and reduced.
［実施例］ 図面は成形工程を順に示すもので、１は射出成形による
有底のプリフォーム、２は一次成形品、３は熱処理され
た成形品、４は最終成形品である容器である。[Examples] The drawings show the molding steps in order: 1 is a bottomed preform by injection molding, 2 is a primary molded product, 3 is a heat-treated molded product, and 4 is a final molded product.
上記プリフォーム１の長さ及び肉厚等は、一次成形品２
を対象として設計される。この一次成形品２の容器４よ
りも1.5倍ほど大きくブロー成形されるので、ブロー倍
率の点から、プリフォーム１は通常の成形の場合より
も、長く作ることができ、また肉厚も薄くすることがで
きる。The length and wall thickness of the above preform 1 are the same as those of the primary molded product 2
Is designed for. Since the blow molding is 1.5 times larger than the container 4 of the primary molded product 2, the preform 1 can be made longer and the wall thickness can be made thinner than in the case of normal molding in view of the blow magnification. be able to.
射出成形したプリフォーム１は、通常のごとく延伸ブロ
ー成形に適した温度に調整されたのち、一次ブロー型５
のキャビテイに収容され、一次成形品２に延伸ブロー成
形される。The injection-molded preform 1 is adjusted to a temperature suitable for stretch blow molding as usual, and then the primary blow mold 5
The first molded product 2 is stretch blow-molded.
成形後、一次成形品２はオーブンなどの熱処理装置６に
送られる。この時、一次成形品２の口部にには、第２図
に示すキャップ部材７が気密に被される。After molding, the primary molded product 2 is sent to a heat treatment device 6 such as an oven. At this time, the cap member 7 shown in FIG. 2 is airtightly covered on the opening of the primary molded product 2.
このキャップ部材７には、高圧のブローエア流路８と、
内圧調整用のリリーフバルブ９とが接続してあり、密封
後にブローエア流路８からエアが供給されて一次成形品
内が一定の圧力（大気圧を０気圧表示する圧力測定器で
測定した場合の値が0.1〜２気圧）に維持される。この
ような準備の後、一次成形品２は所定温度により加熱さ
れる。加熱を受けた一次成形品２では収縮が起り、口部
を残して成形品全体が縮小する。The cap member 7 has a high-pressure blow air flow path 8,
It is connected to a relief valve 9 for adjusting the internal pressure, and air is supplied from the blow air flow path 8 after sealing so that the inside of the primary molded product has a constant pressure (when measured with a pressure measuring instrument that indicates the atmospheric pressure as 0 atm). The value is maintained at 0.1 to 2 atmospheres). After such preparation, the primary molded product 2 is heated at a predetermined temperature. The primary molded product 2 that has been heated contracts and the entire molded product shrinks, leaving the mouth.
この縮小は、内圧に抗して上記容器４を成形する製品ブ
ロー型10のキャビティよりも小さくなるまで行なわれ
る。また内圧により成形品３の壁部は緊張されているこ
とから、部分的な収縮が起り難く、成形品３では内圧と
のバランスの下に熱収縮が生じる結果、収縮むらが極め
て少なくなる。This reduction is performed until it becomes smaller than the cavity of the product blow mold 10 for molding the container 4 against the internal pressure. Further, since the wall portion of the molded product 3 is strained by the internal pressure, it is difficult for the molded product 3 to partially contract. As a result, thermal contraction occurs in the molded product 3 in balance with the internal pressure.
この際、内圧は加熱と成形品３の縮小とにより昇圧し、
設定圧力よりも高くなって縮小を困難とする虞れがある
が、この昇圧分はリリーフバルブ９から排除されるた
め、特に障害となるようなことはない。At this time, the internal pressure is increased by heating and shrinking the molded product 3,
There is a risk that the pressure will be higher than the set pressure and it will be difficult to reduce the pressure, but since this pressure increase is removed from the relief valve 9, there is no particular obstacle.
上記のように加熱収縮された成形品３は、直に常温から
120℃の範囲に設定された製品ブロー型10に移送され、
容器４にブロー成形される。The molded product 3 that has been heat-shrinked as described above is
Transferred to the product blow mold 10 set in the range of 120 ℃,
The container 4 is blow molded.
次に一次成形品２の熱処理による容器４の壁部結果を示
す。Next, the result of the wall portion of the container 4 by the heat treatment of the primary molded product 2 is shown.
プリフォーム 成形材料 ポリエチレンテレフタレート 重 量 59g 一次成形品 容 量 2.1 容器（最終製品） 容 量 1.5l なお、収縮率は90℃熱水による。Preform Molding material Polyethylene terephthalate Weight 59g Primary molding Volume 2.1 Container (final product) Volume 1.5l The shrinkage is based on hot water at 90 ° C.
また従来法での熱処理はプロー型を用いた。Further, the heat treatment in the conventional method used a plow type.
成形サイクル 本願発明 27秒 従来法 34秒 またプリフォーム１を容積比で容器４の1.2〜3.0倍まで
延伸ブローして一次成形品２となし、それを100℃〜280
℃の温度範囲で20〜120秒、好ましくは130℃以上で30秒
以上維持した後、容器４のブロー成形を行うと、アセト
アルデヒドの発生が極めて低減する。Molding cycle 27 seconds of the present invention Conventional method 34 seconds In addition, the preform 1 is drawn and blown by 1.2 to 3.0 times the volume ratio of the container 4 to form a primary molded product 2, which is 100 ° C to 280 ° C.
When the container 4 is blow-molded after being kept at a temperature range of 20 ° C. for 20 to 120 seconds, preferably at 130 ° C. or higher for 30 seconds or more, the generation of acetaldehyde is extremely reduced.
その１例を挙げる次の通りである。An example thereof is as follows.
一次成形品の容量 2.6l 熱処理温度 180℃ 維持時間 60秒 容器の容量 1.5l アセトアルデヒド（測定法：ヘッドスペース法） 熱処理前 2.5612μg/l 熱処理後 0.7268μg/l ［発明の効果］ この発明は上述のように、プリフォームを最終製品とな
る容器よりも高延伸倍率の一次成形品に成形するととも
に、熱処理を所定の内圧を維持して行なうことから、そ
のとき既に高い結晶化度が得られ、また加熱による収縮
及び縮小が均等に行なわれるため、熱処理時において肉
厚分布も整うので、最終成形品となる容器の肉厚にもむ
らがなく、また事前の熱処理により残留応力が取除かれ
た状態で、容器の成形が行われるため、従来法による場
合よりも残留応力が少なく、残留応力による経時変化は
もとより、加熱充填に際する容器の収縮率にも大きなバ
ラツキが生じない。したがつて対衝撃性、減圧強度、耐
熱性などに優れた容器が得られる。Volume of primary molded product 2.6l Heat treatment temperature 180 ℃ Maintenance time 60 seconds Container volume 1.5l Acetaldehyde (measurement method: headspace method) Before heat treatment 2.5612μg / l After heat treatment 0.7268μg / l [Effect of the invention] As described above, the preform is molded into a primary molded product having a higher draw ratio than the container to be the final product, and the heat treatment is performed while maintaining a predetermined internal pressure, at which time a high crystallinity is obtained, Also, since the shrinkage and shrinkage due to heating are performed evenly, the wall thickness distribution is adjusted during the heat treatment, and the wall thickness of the container to be the final molded product is uniform, and the residual stress was removed by the previous heat treatment. Since the container is molded in this state, there is less residual stress than in the case of the conventional method, and there is a large variation in the shrinkage rate of the container during heating and filling as well as the change over time due to the residual stress. Absent. Therefore, a container excellent in impact resistance, reduced pressure strength, heat resistance and the like can be obtained.
また熱処理によりアセトアルデヒドの発生が減少し、そ
の量は極めて僅かとなるので、コーラ飲料、ミネラルウ
ォーター、食用油などの容器として好適であり、プリフ
ォームの射出成形から容器のブロー成形までの成形サイ
クルも、ブロー型により熱処理を行なう場合よりも短縮
され、成形能率が一段と向上するなどの利点をも有す
る。Also, the heat treatment reduces the generation of acetaldehyde, and its amount becomes extremely small, so it is suitable as a container for cola beverages, mineral water, edible oil, etc., and the molding cycle from injection molding of preforms to blow molding of containers is also possible. Further, it has advantages that it is shortened as compared with the case where the heat treatment is performed by the blow mold, and the molding efficiency is further improved.
第１図は、この発明に係る二軸延伸ブロー容器の製造方
法の略示工程説明図である。 第２図はキャップ部材の断面図である。 １……プリフォーム ２……一次成形品 ３……熱処理された成形品 ４……容器FIG. 1 is a schematic process explanatory view of a method for manufacturing a biaxially stretched blow container according to the present invention. FIG. 2 is a sectional view of the cap member. 1 …… Preform 2 …… Primary molded product 3 …… Heat treated molded product 4 …… Container
Claims (3)
の形態を有する一次成形品に形成し、その一次成形品を
熱処理により収縮させたのち容器にブロー成形するにあ
たり、 上記熱処理工程において、 一次成形品の加熱に伴う収縮の制御を、一次成形品への
気体の圧入または排出の少なくとも１方により一次成形
品の内圧を制御することにより行なうことを特徴とする
二軸延伸ブロー容器の製造方法。1. A preform is formed by stretch blow molding into a primary molded product having the shape of a container, the primary molded product is contracted by heat treatment and then blow molded into a container. The method for producing a biaxially stretched blow container, wherein the shrinkage control due to heating is controlled by controlling the internal pressure of the primary molded product by at least one of the injection and discharge of gas into the primary molded product.
は、一次成形品内の気体の排出により制御することを特
徴とする請求項１記載の二軸延伸ブロー容器の製造方
法。2. The method for producing a biaxially stretched blow container according to claim 1, wherein the pressurization in the primary molded product due to heating and shrinkage is controlled by discharging the gas in the primary molded product.
ォームの延伸ブローは、容積比で最終製品となる容器の
1.2〜3.0倍までとし、一次成形品の熱処理による収縮を
280℃以下の温度にて20〜120秒維持して行って、ポリエ
チレンテレフタレートからのアセトアルデヒドの発生を
低減することを特徴とする請求項１記載の二軸延伸ブロ
ー容器の製造方法。3. Stretch-blowing of a preform with polyethylene terephthalate is performed in a volumetric ratio of a container to be a final product.
1.2 to 3.0 times to prevent shrinkage due to heat treatment of the primary molded product
The method for producing a biaxially stretched blow container according to claim 1, wherein generation of acetaldehyde from polyethylene terephthalate is reduced by maintaining the temperature at 280 ° C or lower for 20 to 120 seconds.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27556589 | 1989-10-23 | ||
| JP1-275565 | 1989-10-23 |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5185540A Division JPH085118B2 (en) | 1989-10-23 | 1993-06-29 | Method for manufacturing biaxially stretched blow container |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH03205124A JPH03205124A (en) | 1991-09-06 |
| JPH0688314B2 true JPH0688314B2 (en) | 1994-11-09 |
Family
ID=17557221
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2270914A Expired - Lifetime JPH0688314B2 (en) | 1989-10-23 | 1990-10-09 | Method for manufacturing biaxially stretched blow container |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0688314B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11207809A (en) * | 1997-04-23 | 1999-08-03 | Nissei Asb Mach Co Ltd | Container reduced in acetaldehyde and molding thereof |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0813498B2 (en) * | 1992-02-29 | 1996-02-14 | 日精エー・エス・ビー機械株式会社 | Molding method for heat-resistant container |
| US5445515A (en) * | 1992-10-14 | 1995-08-29 | Nissei Asb Machine Co., Ltd. | Apparatus for forming a heat-resistant container |
| JP3047732B2 (en) | 1994-05-16 | 2000-06-05 | 東洋製罐株式会社 | Manufacturing method of biaxially stretched blow container |
| JP3777204B2 (en) * | 1994-11-11 | 2006-05-24 | 日精エー・エス・ビー機械株式会社 | Heat-resistant container molding apparatus and molding method |
| JP5491527B2 (en) | 2009-12-25 | 2014-05-14 | 日精エー・エス・ビー機械株式会社 | Large container manufacturing method |
| WO2012057090A1 (en) | 2010-10-25 | 2012-05-03 | 日精エー・エス・ビー機械株式会社 | Production method for hollow container |
| JP6727760B2 (en) * | 2015-05-12 | 2020-07-22 | 日精エー・エス・ビー機械株式会社 | Hollow container manufacturing method and blow molding apparatus |
| KR102852430B1 (en) * | 2018-04-24 | 2025-08-29 | 미쯔비시 가스 케미칼 컴파니, 인코포레이티드 | Multilayer bodies and multilayer containers |
| WO2019208687A1 (en) | 2018-04-26 | 2019-10-31 | 三菱瓦斯化学株式会社 | Stretched film, packaging material and method for producing stretched film |
-
1990
- 1990-10-09 JP JP2270914A patent/JPH0688314B2/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11207809A (en) * | 1997-04-23 | 1999-08-03 | Nissei Asb Mach Co Ltd | Container reduced in acetaldehyde and molding thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH03205124A (en) | 1991-09-06 |
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