JPH11156889A - Olefinic thermoplastic elastomer molded product and its production - Google Patents
Olefinic thermoplastic elastomer molded product and its productionInfo
- Publication number
- JPH11156889A JPH11156889A JP33060397A JP33060397A JPH11156889A JP H11156889 A JPH11156889 A JP H11156889A JP 33060397 A JP33060397 A JP 33060397A JP 33060397 A JP33060397 A JP 33060397A JP H11156889 A JPH11156889 A JP H11156889A
- Authority
- JP
- Japan
- Prior art keywords
- skin layer
- tpo
- olefin resin
- molded product
- broken
- 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
- 238000004519 manufacturing process Methods 0.000 title claims description 9
- 229920002397 thermoplastic olefin Polymers 0.000 title abstract 2
- 229920005672 polyolefin resin Polymers 0.000 claims abstract description 22
- 229920001971 elastomer Polymers 0.000 claims abstract description 19
- 239000005060 rubber Substances 0.000 claims abstract description 16
- 239000000203 mixture Substances 0.000 claims abstract description 14
- 238000001746 injection moulding Methods 0.000 claims abstract description 6
- 229920002725 thermoplastic elastomer Polymers 0.000 claims abstract description 4
- 238000000465 moulding Methods 0.000 claims description 14
- 239000004743 Polypropylene Substances 0.000 claims description 9
- 229920000181 Ethylene propylene rubber Polymers 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 5
- 239000012778 molding material Substances 0.000 claims description 4
- -1 polypropylene Polymers 0.000 claims description 3
- 229920001155 polypropylene Polymers 0.000 claims description 3
- 239000010410 layer Substances 0.000 claims 4
- 150000001336 alkenes Chemical class 0.000 claims 1
- JRZJOMJEPLMPRA-UHFFFAOYSA-N olefin Natural products CCCCCCCC=C JRZJOMJEPLMPRA-UHFFFAOYSA-N 0.000 claims 1
- 239000002344 surface layer Substances 0.000 claims 1
- 238000000926 separation method Methods 0.000 abstract description 6
- 229920005989 resin Polymers 0.000 abstract description 5
- 239000011347 resin Substances 0.000 abstract description 5
- 239000000243 solution Substances 0.000 abstract 1
- 238000005520 cutting process Methods 0.000 description 13
- 239000000463 material Substances 0.000 description 13
- 238000001816 cooling Methods 0.000 description 5
- 239000004793 Polystyrene Substances 0.000 description 4
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 description 4
- 238000012856 packing Methods 0.000 description 4
- 229920002223 polystyrene Polymers 0.000 description 4
- 239000000806 elastomer Substances 0.000 description 3
- 229920001935 styrene-ethylene-butadiene-styrene Polymers 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 230000002950 deficient Effects 0.000 description 2
- 229920001903 high density polyethylene Polymers 0.000 description 2
- 239000004700 high-density polyethylene Substances 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 229920002742 polystyrene-block-poly(ethylene/propylene) -block-polystyrene Polymers 0.000 description 2
- 239000000956 alloy Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229920001400 block copolymer Polymers 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010292 electrical insulation Methods 0.000 description 1
- 229920000578 graft copolymer Polymers 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 229920003049 isoprene rubber Polymers 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 229920005996 polystyrene-poly(ethylene-butylene)-polystyrene Polymers 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 229920000428 triblock copolymer Polymers 0.000 description 1
Landscapes
- Injection Moulding Of Plastics Or The Like (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、オレフィン樹脂を
硬質相とし、非極性ゴムを軟質相とするブレンドタイプ
のＴＰＯで成形されてなるＴＰＯ成形品に関する。特
に、成形後、使用時に確実な破断・分離が要求される破
断予定部を備えた各種パッキン（シール材）、建築用窓
枠、玩具、家電足ゴム、玩具、絶縁部材等に好適な発明
である。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a TPO molded article molded from a blend type TPO having an olefin resin as a hard phase and a non-polar rubber as a soft phase. In particular, after molding, the invention is suitable for various packings (seal materials) having a portion to be broken which requires reliable breakage / separation during use, window frames for construction, toys, rubber feet for home appliances, toys, insulating members, and the like. is there.
【０００２】[0002]
【背景技術】昨今、ＴＰＯは、比重が０．８８〜０．９
０と熱可塑性エラストマー中、最も軽く、しかも、相対
的に、安価であり、かつ、耐熱性、耐寒性、耐候性、電
気絶縁性等に優れている。BACKGROUND ART Recently, TPO has a specific gravity of 0.88 to 0.9.
0 and the lightest among thermoplastic elastomers, and are relatively inexpensive, and are excellent in heat resistance, cold resistance, weather resistance, electrical insulation and the like.
【０００３】従って、各種パッキン（シール材）、建築
用窓枠、玩具、家電足ゴム、玩具、絶縁部品等の射出成
形品の成形用材料として多用されつつある。[0003] Therefore, it is being widely used as a molding material for injection-molded products such as various packings (seal materials), window frames for construction, toys, rubber feet for home appliances, toys, insulating parts and the like.
【０００４】そして、上記成形品が小さい場合には、組
み部品や、数個の同一形状部品を同一金型で同時成形す
ることが一般的である。金型製作費の削減を含めた生産
性向上のためである。[0004] When the above molded product is small, it is common to simultaneously form an assembled part or several identically shaped parts with the same mold. This is for the purpose of improving productivity including reduction of die manufacturing costs.
【０００５】このような場合、複数のランナ・ゲート部
を介して多数個取りで形成することも考えられる。しか
し、成形サイクルが相対的に長くなり生産性が低下する
とともに、使用時、各部品ごとき破断・分離するような
場合、ランナ・ゲート部が材料ロスとなる。[0005] In such a case, it is conceivable to form a large number of pieces through a plurality of runner gates. However, the molding cycle becomes relatively long and the productivity is reduced, and in the case of breakage and separation of each part during use, material loss occurs at the runner / gate portion.
【０００６】このため、組み部品全体または同一形状部
品複数個における部品相互間を破断予定部で区画して一
体成形し、使用時に該破断予定部で、部品ごとに破断・
分離することが考えられる。[0006] For this reason, the entire assembled part or a plurality of parts having the same shape are separated from each other by a portion to be broken and are integrally formed.
Separation is conceivable.
【０００７】そして、破断予定部を備えたエラストマー
成形品を射出成形する場合においては、該破断予定部
を、極端な薄肉（通常、一般部の肉厚に比して１／５以
下）して成形する必要がある。極端な薄肉にしないと、
破断予定部における確実な破断・分離が困難となるため
である。エラストマー成形品の場合、硬質・半硬質樹脂
の如く屈曲疲労により破断させることが困難であること
にもよる。[0007] When an elastomer molded article having a portion to be broken is injection-molded, the portion to be broken is extremely thin (usually 1/5 or less of the thickness of a general portion). Need to be molded. If you do not make it extremely thin,
This is because it is difficult to reliably break and separate at the portion to be broken. In the case of an elastomer molded product, it is also difficult to break it due to bending fatigue as in a hard / semi-hard resin.
【０００８】[0008]
【発明が解決しようとする課題】しかし、上記従来の成
形方法の場合、極端な薄肉部が存在すると、該部でのエ
ラストマー材料の流れが不良となり外観不良が発生し易
い。例えば、フローマークやウェルドライン等が成形品
表面に発生し易い。特に、材料流れ不良の傾向は、オレ
フィン樹脂と非極性ゴムとのブレンドタイプのＴＰＯの
場合、顕著である。However, in the case of the above-mentioned conventional molding method, if an extremely thin portion exists, the flow of the elastomer material in the portion is poor, and the appearance is likely to be poor. For example, flow marks, weld lines, and the like are likely to occur on the surface of the molded product. In particular, the tendency of poor material flow is remarkable in the case of a blend type TPO of an olefin resin and a non-polar rubber.
【０００９】これに対応するために、各薄肉部（破断予
定部）による区画部ごとにゲートを設けることも考えら
れるが、金型構造が複雑となり実際的ではない。In order to cope with this, it is conceivable to provide a gate for each partition part by each thin part (scheduled part to be broken), but the mold structure is complicated and not practical.
【００１０】本発明は、上記にかんがみて、破断・分離
が確実な破断予定部を有する成形品を樹脂流れ不良に基
づく外観不良を発生させずに射出成形できるＴＰＯ成形
品及びその製造方法を提供することを目的とする。[0010] In view of the above, the present invention provides a TPO molded article and a method for producing the same, which can injection-mold a molded article having a portion to be fractured which is reliably broken and separated without causing appearance defects due to defective resin flow. The purpose is to do.
【００１１】[0011]
【課題を解決するための手段】(1) 本発明に係るＴＰＯ
成形品は、上記課題を、下記構成により解決するもので
ある。[Means for Solving the Problems] (1) TPO according to the present invention
The molded article solves the above problem by the following constitution.
【００１２】硬質のオレフィン樹脂を硬質相とし、非極
性ゴムを軟質相とするブレンドしたブレンドタイプのＴ
ＰＯで射出成形されてなり、破断予定部を備えたＴＰＯ
成形品において、本体部の表面側が、実質的にオレフィ
ン樹脂からなるスキン層とされ、成形品の破断予定部の
スキン層が連続的に又は部分的に切断されていることを
特徴とする。A blend type T in which a hard olefin resin is used as a hard phase and a non-polar rubber is used as a soft phase.
TPO injection molded with PO
The molded article is characterized in that the surface side of the main body portion is a skin layer substantially made of an olefin resin, and the skin layer at the portion of the molded article to be broken is continuously or partially cut.
【００１３】(2) 本発明に係るＴＰＯ成形品の製造方法
は、上記課題を、下記構成により解決するものである。(2) The method for producing a TPO molded article according to the present invention solves the above-mentioned problems by the following constitution.
【００１４】オレフィン樹脂を硬質相とし、非極性ゴム
を軟質相とするブレンドタイプのＴＰＯを成形材料とし
て射出成形により破断予定部を備えたＴＰＯ成形品を製
造する方法において、本体部の表面側に、実質的にオレ
フィン樹脂からなるスキン層が形成されるように射出成
形し、スキン層の破断予定部を、成形金型内で連続的に
または部分的に切断することを特徴とする。In a method for producing a TPO molded article having a portion to be fractured by injection molding using a blend type TPO having an olefin resin as a hard phase and a non-polar rubber as a soft phase as a molding material, the method comprises the steps of: The injection molding is performed so that a skin layer substantially made of an olefin resin is formed, and a portion to be broken of the skin layer is continuously or partially cut in a molding die.
【００１５】[0015]
【発明の実施の形態】次に、本発明の成形品を、図１に
示すような、パッキン材１２を例に採り説明をする。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, a molded article of the present invention will be described with reference to a packing material 12 as shown in FIG.
【００１６】(1) 本実施形態のＴＰＯ成形品は、硬質の
オレフィン樹脂を硬質相とし、非極性ゴムを軟質相とす
るブレンドタイプのＴＰＯで成形されてなり、破断予定
部１４を備えた構成である。(1) The TPO molded article of the present embodiment is formed of a blend type TPO in which a hard olefin resin is used as a hard phase and a non-polar rubber is used as a soft phase. It is.
【００１７】ここで硬質のオレフィン樹脂としては、結
晶性ポリプロピレン（結晶性ＰＰ）、高密度ポリエチレ
ン（ＨＤＰＥ）及びそれらのポリマーアロイを挙げるこ
とができる。これらの内で、強度及び耐熱性等に優れて
いる結晶性ＰＰが望ましい。スキン層１６の強度を担保
し易く、かつ、耐熱性が優れていることにより、成形品
全体としての汎用性が増大するためである。Here, examples of the hard olefin resin include crystalline polypropylene (crystalline PP), high-density polyethylene (HDPE), and polymer alloys thereof. Among them, crystalline PP excellent in strength, heat resistance and the like is desirable. This is because the strength of the skin layer 16 is easily ensured and the heat resistance is excellent, so that the versatility of the entire molded product is increased.
【００１８】また、非極性ゴムとしては、エチレンプロ
ピレンゴム（ＥＰＲ）、イソプレンゴム（ＩＩＲ）、ス
チレンゴム（ＳＢＲ）等の他に、トリブロック共重合体
であるＳＢＳ、ＳＩＳの各水素添加物であるＳＥＢＳ、
ＳＥＰＳ等のスチレン系ＴＰＥも使用可能である。な
お、ＳＩＳは「ポリスチレン−ポリブタジエン−ポリス
チレン」、ＳＢＳは「ポリスチレン−ポリイソプレン−
ポリスチレン」、ＳＥＢＳは「ポリスチレン−ポリ（エ
チレン−ブチレン）−ポリスチレン」、ＳＥＰＳは「ポ
リスチレン−ポリ（エチレン−プロピレン）−ポリスチ
レン」の各略号である。Non-polar rubbers include ethylene propylene rubber (EPR), isoprene rubber (IIR), styrene rubber (SBR), etc., and hydrogenated products of triblock copolymers such as SBS and SIS. A SEBS,
Styrene TPE such as SEPS can also be used. Note that SIS is “polystyrene-polybutadiene-polystyrene”, and SBS is “polystyrene-polyisoprene-polystyrene”.
Polystyrene "and SEBS are abbreviations of" polystyrene-poly (ethylene-butylene) -polystyrene ", and SEPS is an abbreviation of" polystyrene-poly (ethylene-propylene) -polystyrene ".
【００１９】ブレンドタイプとするのは、成形品の本体
部１４の表面部に実質的にオレフィン樹脂（特にＰＰ）
からなり引張り強さ等の機械的強度に優れたスキン層１
６を形成するためである。ニートタイプのブロック共重
合体やグラフト共重合体では、本体部１４の表面側に実
質的にオレフィン樹脂（特にＰＰ）からなるスキン層１
６を形成することは困難である。ニートタイプでは、硬
質相と軟質相とが化学結合されており、表面側と内部と
の硬質相／軟質相比を変動させることが困難なためであ
る。In the case of the blend type, an olefin resin (particularly, PP) is substantially formed on the surface of the main body 14 of the molded product.
Skin layer 1 consisting of excellent mechanical strength such as tensile strength
6 is formed. In the case of a neat type block copolymer or graft copolymer, the skin layer 1 substantially made of an olefin resin (particularly PP) is provided on the surface side of the main body 14.
Forming 6 is difficult. This is because in the neat type, the hard phase and the soft phase are chemically bonded, and it is difficult to change the hard phase / soft phase ratio between the surface side and the inside.
【００２０】そして、ブレンドタイプとしては、非架橋
ブレンドタイプ、部分架橋ブレンド、完全架橋（動的架
橋）ブレンドタイプがあるが、耐圧縮永久歪み性、耐油
性、等の見地から完全架橋ブレンドタイプが望ましい。As the blend type, there are a non-crosslinked blend type, a partially crosslinked blend, and a completely crosslinked (dynamically crosslinked) blend type. From the viewpoint of compression set resistance, oil resistance, etc., the completely crosslinked blend type is used. desirable.
【００２１】硬質相（拘束相）と軟質相との比率は、対
応製品により異なるが、硬質相／軟質相＝２／８〜７／
３とする。硬質相が過少であると、成形品表面部に安定
してスキン層を形成し難く、軟質相が過少であると、成
形品に要求されるエラストマー性を付与し難くなる。The ratio of the hard phase (constrained phase) to the soft phase differs depending on the corresponding product, but hard phase / soft phase = 2/8 to 7 /
3 is assumed. If the amount of the hard phase is too small, it is difficult to form a skin layer stably on the surface of the molded article. If the amount of the soft phase is too small, it is difficult to give the molded article the elastomeric properties required.
【００２２】(1) 本実施形態では、本体部１４の表面側
が、実質的にオレフィン樹脂からなるスキン層１６とさ
れ、成形品の破断予定部１８のスキン層１６が連続的に
又は部分的に切断２０されている。(1) In the present embodiment, the surface side of the main body portion 14 is a skin layer 16 substantially made of an olefin resin, and the skin layer 16 of the part 18 to be broken of the molded product is continuously or partially formed. It has been cut 20.
【００２３】当該構成により本体部１４を極端な薄肉に
しなくても、破断予定部１８の確実な破断・分離を担保
できる。実質的にオレフィン樹脂からなり強度を有する
スキン層１６の破断予定部１８を切断することにより、
破断予定部１８と他部とに要求される強度格差を容易に
達成できるためである。With this configuration, reliable breakage / separation of the breakable portion 18 can be ensured without making the main body portion 14 extremely thin. By cutting the expected fracture portion 18 of the skin layer 16 substantially composed of an olefin resin and having strength,
This is because the difference in strength required between the portion to be broken 18 and the other portion can be easily achieved.
【００２４】図例では、破断予定部１８の肉厚ｄは、一
般部の最大肉厚Ｄより薄くされている。ここで、材料流
れが阻害されないように、破断予定部の肉厚ｄは、一般
部の肉厚Ｄの、約１／４以上、望ましくは約１／３以上
とする。なお、略同一肉厚で破断予定部１８が切断溝２
０により形成されている構成も可能である。In the illustrated example, the thickness d of the portion 18 to be broken is smaller than the maximum thickness D of the general portion. Here, the thickness d of the portion to be broken is about 約 or more, preferably about １ ／ or more, of the thickness D of the general portion so that the material flow is not hindered. In addition, the to-be-broken portion 18 having substantially the same thickness is
A configuration formed by zeros is also possible.
【００２５】ここで、スキン層１６の厚みは、通常、２
〜１００μｍ、望ましくは、２〜５０μｍとする。２μ
ｍ未満では破断予定部１８にスキン層１６を切断したと
きの他部との強度格差を確保しがたい。即ち、強度格差
を担保するために、成形品１２の破断予定部１８を極端
な薄肉にする必要が発生する。他方、１００μｍを越え
るスキン層１６は形成し難い。Here, the thickness of the skin layer 16 is usually 2
To 100 μm, desirably 2 to 50 μm. 2μ
If it is less than m, it is difficult to secure a difference in strength from other portions when the skin layer 16 is cut into the portion 18 to be broken. That is, in order to secure the strength difference, it is necessary to make the breakable portion 18 of the molded product 12 extremely thin. On the other hand, it is difficult to form the skin layer 16 exceeding 100 μm.
【００２６】上記スキン層の膜厚調整は、金型温度（冷
却温度）を調整することにより行う。金型温度を通常の
冷却温度より低く設定することにより、本体部１４の表
面側に実質的にオレフィン樹脂からなるスキン層１６が
形成できる。その理由は、樹脂成分は材料流れがゴム成
分に比して良好であるが、冷却金型のキャビティ面に接
触することにより冷却硬化して流動を停止してスキン層
１６が形成されるが、ゴム成分はそのまま流動して本体
部１４の内部側に移行するためである。そして、冷却温
度が低ければ、表面側で冷却硬化される樹脂量は増大し
て相対的にスキン層１６が厚肉となる。The thickness of the skin layer is adjusted by adjusting the mold temperature (cooling temperature). By setting the mold temperature lower than the normal cooling temperature, the skin layer 16 substantially made of an olefin resin can be formed on the surface side of the main body 14. The reason for this is that the resin component has a better material flow than the rubber component, but is cooled and hardened by contacting the cavity surface of the cooling mold to stop the flow and the skin layer 16 is formed. This is because the rubber component flows as it is and moves to the inside of the main body 14. If the cooling temperature is low, the amount of the resin that is cooled and hardened on the surface side increases, and the skin layer 16 becomes relatively thick.
【００２７】例えば、成形材料温度を２００〜２５０℃
としたとき、金型温度を６０℃以下（通常、２０〜６０
℃）とすると、本体部１４の表面側に、通常、上記２〜
１００μｍのスキン層１６が形成される。For example, when the molding material temperature is 200 to 250 ° C.
When the mold temperature is 60 ° C. or less (usually 20 to 60
C), the surface side of the main body 14 is usually
A 100 μm skin layer 16 is formed.
【００２８】(2) 上記切断溝２０の深さは、安定して切
断するために、通常、２００μｍ以上、望ましくは５０
０μｍ以上で、薄肉部は通常の成形品運搬・取扱の際に
加わる力によっては破断しないものとする。従って、破
断予定部１８の肉厚にもよるが、通常、１mm前後とす
る。(2) The depth of the cutting groove 20 is usually 200 μm or more, preferably 50 μm, for stable cutting.
When the thickness is 0 μm or more, the thin portion is not broken by the force applied during normal transportation and handling of the molded product. Therefore, although it depends on the thickness of the portion 18 to be broken, it is usually about 1 mm.
【００２９】そして、上記切断溝２０は、スキン層１６
の破断予定部１８を、成形金型２２内で連続的にまたは
部分的に切断することが望ましい。後から切断する必要
がなく生産性が向上するためである。The cut groove 20 is formed in the skin layer 16.
Is desirably cut continuously or partially in the molding die 22. This is because productivity does not need to be cut later.
【００３０】例えば、図２に示すごとく、雄型２４・雌
型２６からなる成形金型２２を用意する。そして、該成
形金型２２の破断予定形成部は、必然的ではないが薄肉
部を形成できるように雄型２４から凸条部２８が形成さ
れている。該凸条部２８には連続的または不連続的にス
キン層１６を切断するための切断用刃３０が埋設されて
いる。該切断用刃３０は図示しないスライドコアで凸条
部２８の頂面から出没可能とされている。For example, as shown in FIG. 2, a molding die 22 including a male die 24 and a female die 26 is prepared. The ridge portion 28 is formed from the male mold 24 so as to form a thin portion, though not indispensable, in the portion to be broken of the molding die 22. A cutting blade 30 for continuously or discontinuously cutting the skin layer 16 is embedded in the ridge portion 28. The cutting blade 30 is made of a slide core (not shown) and can protrude and retract from the top surface of the ridge 28.
【００３１】まず、切断用刃３０をその先端が凸条部２
８の頂面と略面一とした状態で、ＴＰＯ材料を成形金型
２２の成形品キャビティ２３に射出する。First, the tip of the cutting blade 30 is set to the ridge portion 2.
8, the TPO material is injected into the molding cavity 23 of the molding die 22 while being substantially flush with the top surface of the molding die 8.
【００３２】このとき、金型温度は所定膜厚のスキン層
１６を形成可能な温度に調整されている。このため、金
型キャビティ面２３ａに沿って、スキン層１６が形成さ
れる。該スキン層１６の形成後（完全に冷却固化する前
でも実質的に金型内で形成されておればよい。）、前記
切断用刃３０を前進させる。すると、破断予定部１８に
おいてスキン層１６と内側本体部１４の一部に切断溝２
０が形成される。At this time, the mold temperature is adjusted to a temperature at which a skin layer 16 having a predetermined thickness can be formed. Therefore, the skin layer 16 is formed along the mold cavity surface 23a. After the formation of the skin layer 16 (it is sufficient that the skin layer 16 is substantially formed in a mold even before being completely cooled and solidified), the cutting blade 30 is advanced. Then, the cut groove 2 is formed in the skin layer 16 and a part of the inner body portion 14 in the portion 18 to be broken.
0 is formed.
【００３３】そして、設定冷却固化時間が経過したな
ら、離型する。Then, after the set cooling solidification time has elapsed, the mold is released.
【００３４】[0034]
【発明の作用・効果】本発明のＴＰＯ成形品は、本体部
の表面側が、実質的にオレフィン樹脂からなるスキン層
とされ、成形品の破断予定部のスキン層が連続的にまた
は部分的に切断されていることにより上記構成により、
下記のような作用・効果を奏するものである。According to the TPO molded article of the present invention, the surface side of the main body is formed of a skin layer substantially composed of an olefin resin, and the skin layer of the part to be broken of the molded article is continuously or partially formed. By being cut, by the above configuration,
The following operations and effects are achieved.
【００３５】本発明では、本体部の表面側に形成される
強度の大きなスキン層を切断することにより破断予定部
を形成する。このため、破断予定部と他部とに要求され
る強度格差を容易に達成できる。即ち、本体部を極端な
薄肉にしなくても、破断予定部の確実な破断・分離を担
保できる。In the present invention, a portion to be broken is formed by cutting a high-strength skin layer formed on the surface side of the main body. For this reason, the difference in strength required between the portion to be broken and the other portion can be easily achieved. That is, reliable breakage / separation of the portion to be broken can be ensured without making the main body portion extremely thin.
【００３６】従って、破断予定部を形成するために、極
端な薄肉部を成形時に形成する必要はなく、材料流れ不
良に基づく、外観不良が成形品に発生するおそれがな
い。Accordingly, it is not necessary to form an extremely thin portion at the time of molding in order to form the portion to be broken, and there is no possibility that defective appearance will occur in the molded product due to poor material flow.
【００３７】また、本発明のＴＰＯ成形品の製造方法
は、上記切断を金型内に行うことにより、離型後、切断
をする必要がなく、本発明のＴＰＯ成形品を生産性良好
に製造可能となる。Further, in the method for producing a TPO molded article of the present invention, the above-mentioned cutting is performed in a mold, so that there is no need to cut after releasing from the mold, and the TPO molded article of the present invention is produced with good productivity. It becomes possible.
【００３８】ちなみに、下記仕様のＴＰＯ材料を用い
て、材料温度２２０℃、金型温度２３℃の条件で成形し
たところ、表面部に肉厚５０μｍのＰＰスキン層が形成
された。そして、射出後、３秒後に切断刃を突出させ、
３０秒後に離型したところ、該部は奇麗に切断されてお
り、手で力を加えて引っ張ったところ、該破断予定部で
奇麗に破断・分離した。By the way, when a TPO material having the following specifications was molded at a material temperature of 220 ° C. and a mold temperature of 23 ° C., a 50 μm thick PP skin layer was formed on the surface. And 3 seconds after the injection, the cutting blade is projected,
When the mold was released after 30 seconds, the part was cut cleanly. When the part was pulled by applying force by hand, the part was cleanly broken and separated at the part to be broken.
【００３９】ＴＰＯ材料：結晶性ＰＰ ５０部、ＥＰＲ
４０部、ＳＥＢＳ １０部、の組成で、成形品硬度Ｈ
S （JIS Ａ）９５を示すもの。TPO material: 50 parts of crystalline PP, EPR
With a composition of 40 parts and 10 parts of SEBS, the molded product hardness H
Indicates S (JIS A) 95.
【００４０】なお、本発明の技術は、上記の例示の如
く、玩具等の組み部品や、パッキン等の数個の同一形状
部品を同一金型で同時成形する場合ばかりでなく、自動
車のエアバッグ飛び出し用の破断予定部を備えた成形品
（パッドカバー）にも適用可能である。The technique of the present invention can be applied not only to the case of assembling parts such as toys and several parts of the same shape such as packing at the same time with the same mold as described above, but also to the airbag of automobiles. The present invention can also be applied to a molded product (pad cover) having a breakable portion for protrusion.
【図１】本発明を適用するＴＰＯ成形品の一例を示す斜
視図FIG. 1 is a perspective view showing an example of a TPO molded product to which the present invention is applied.
【図２】本発明の製造方法を示す要部金型断面図FIG. 2 is a sectional view of a main part mold showing a manufacturing method of the present invention.
１２ 成形品 １４ 成形品の本体部 １６ 成形品のスキン層 １８ 破断予定部 ２０ 切断溝 ２２ 成形金型 ２４ 雄型 ２６ 雌型 ２８ 凸条部 ３０ 切断用刃 DESCRIPTION OF SYMBOLS 12 Molded product 14 Main part of molded product 16 Skin layer of molded product 18 Expected breakage portion 20 Cutting groove 22 Molding die 24 Male die 26 Female die 28 Convex ridge 30 Cutting blade
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.6 識別記号 ＦＩ Ｂ２９Ｌ 31:26 ──────────────────────────────────────────────────の Continued on front page (51) Int.Cl. 6 Identification code FI B29L 31:26
Claims (4)
極性ゴムを軟質相とするブレンドタイプのオレフィン系
熱可塑性エラストマー（以下「ＴＰＯ」と略す。）で射
出成形されてなり、破断予定部を備えたＴＰＯ成形品に
おいて、 本体部の表面側が、実質的にオレフィン樹脂からなるス
キン層とされ、前記破断予定部の前記スキン層が連続的
に又は部分的に切断されていることを特徴とするＴＰＯ
成形品。An injection-molded olefin thermoplastic elastomer (hereinafter abbreviated as "TPO") having a hard olefin resin as a hard phase and a non-polar rubber as a soft phase. In the TPO molded article provided, the surface side of the main body portion is a skin layer substantially made of an olefin resin, and the skin layer at the portion to be broken is cut continuously or partially. TPO
Molding.
レンであり、前記非極性ゴムが動的加硫されたエチレン
プロピレンゴム（以下「ＥＰＲ」と略す。）であること
を特徴とする請求項１記載のＴＰＯ成形品。2. The method according to claim 1, wherein the olefin resin is crystalline polypropylene, and the non-polar rubber is a dynamically vulcanized ethylene propylene rubber (hereinafter abbreviated as “EPR”). TPO molded product.
極性ゴムを軟質相とするブレンドタイプのＴＰＯを成形
材料として射出成形により破断予定部を備えたＴＰＯ成
形品を製造する方法において、 本体部の表面側に、実質的にオレフィン樹脂からなるス
キン層が形成されるように射出成形し、 前記スキン層の破断予定部を、成形金型内で連続的に又
は部分的に切断することを特徴とするＴＰＯ成形品の製
造方法。3. A method for producing a TPO molded article having a portion to be fractured by injection molding using a blend type TPO having a hard olefin resin as a hard phase and a non-polar rubber as a soft phase as a molding material, comprising: Injection molding such that a skin layer substantially composed of an olefin resin is formed on the surface side of the surface layer, and the portion to be broken of the skin layer is continuously or partially cut in a molding die. A method for producing a TPO molded product.
レンであり、前記非極性ゴムが動的加硫されたＥＰＲで
あることを特徴とする請求項３記載のＴＰＯ成形品の製
造方法。4. The method according to claim 3, wherein the olefin resin is crystalline polypropylene, and the non-polar rubber is dynamically vulcanized EPR.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP33060397A JP3577922B2 (en) | 1997-12-01 | 1997-12-01 | Olefin-based thermoplastic elastomer molded article and method for producing the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP33060397A JP3577922B2 (en) | 1997-12-01 | 1997-12-01 | Olefin-based thermoplastic elastomer molded article and method for producing the same |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH11156889A true JPH11156889A (en) | 1999-06-15 |
| JP3577922B2 JP3577922B2 (en) | 2004-10-20 |
Family
ID=18234510
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP33060397A Expired - Fee Related JP3577922B2 (en) | 1997-12-01 | 1997-12-01 | Olefin-based thermoplastic elastomer molded article and method for producing the same |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3577922B2 (en) |
-
1997
- 1997-12-01 JP JP33060397A patent/JP3577922B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JP3577922B2 (en) | 2004-10-20 |
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