JP2005186542A - Multi-colored molded article and its manufacturing method - Google Patents

Multi-colored molded article and its manufacturing method Download PDF

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Publication number
JP2005186542A
JP2005186542A JP2003433454A JP2003433454A JP2005186542A JP 2005186542 A JP2005186542 A JP 2005186542A JP 2003433454 A JP2003433454 A JP 2003433454A JP 2003433454 A JP2003433454 A JP 2003433454A JP 2005186542 A JP2005186542 A JP 2005186542A
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Prior art keywords
pair
resin material
molding
molded product
filling
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Haruhiko Ae
晴彦 阿江
Tomomi Hasegawa
智巳 長谷川
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Idemitsu Kosan Co Ltd
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Idemitsu Kosan Co Ltd
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Priority to JP2003433454A priority Critical patent/JP2005186542A/en
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    • 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
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/16—Making multilayered or multicoloured articles
    • B29C45/1635—Making multilayered or multicoloured articles using displaceable mould parts, e.g. retractable partition between adjacent mould cavities
    • B29C45/1639—Removable partitions between adjacent mould cavity portions
    • 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
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/16—Making multilayered or multicoloured articles
    • B29C45/1657—Making multilayered or multicoloured articles using means for adhering or bonding the layers or parts to each other
    • 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
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/1703—Introducing an auxiliary fluid into the mould
    • B29C45/1704—Introducing an auxiliary fluid into the mould the fluid being introduced into the interior of the injected material which is still in a molten state, e.g. for producing hollow articles
    • 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
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/1703—Introducing an auxiliary fluid into the mould
    • B29C45/1704—Introducing an auxiliary fluid into the mould the fluid being introduced into the interior of the injected material which is still in a molten state, e.g. for producing hollow articles
    • B29C2045/1722—Introducing an auxiliary fluid into the mould the fluid being introduced into the interior of the injected material which is still in a molten state, e.g. for producing hollow articles injecting fluids containing plastic material

Abstract

<P>PROBLEM TO BE SOLVED: To provide a multi-colored molded article having an undercut structure formed in a parting face using a non-complicated mold and showing increased bonding strength, and to provide its manufacturing method. <P>SOLUTION: The multi-colored molded article 1 is molded by forming a pair of protruding portions 2B, both facing to each other, in the first molded portion 2 formed of the first resin material, deforming the pair of the protruding portions 2B by filling pressure of the second resin material so that the ends approach to each other, and clamping a clamped portion 3A of the second molded portion 3 between the pair of the protruding portions 2B. This increases the bonding strength of the laminated portion of the first and second molded portions 2 and 3. Accordingly it is possible to make the undercut structure in the parting face and enhance the bonding strength between the first and second molded portions 2 and 3 using a simple mold 10 having a core back-movable core 13. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

本発明は、少なくとも二種類の樹脂をを積層して成形される多色成形品、およびその成形方法に関する。特に、樹脂同士の積層面（見切り面）での接合強度が要求される成形体の成形に好適な成形方法であって、自動車部品や、家電、ＯＡ部品、住宅設備部品、日用部品等に好適に用いられる。   The present invention relates to a multicolor molded article formed by laminating at least two kinds of resins, and a molding method thereof. In particular, it is a molding method suitable for molding a molded body that requires a bonding strength on a laminated surface (parting surface) between resins, and used for automobile parts, home appliances, OA parts, housing equipment parts, daily parts, etc. Preferably used.

従来より、二色（多色）成形法において、一方の樹脂側に他方の樹脂が入り込んで互いに係合されるアンダーカット構造が提案されている（例えば、特許文献１参照）。
特許文献１の二色成形法では、１次成形体に導入穴と、この導入穴に連続し断面積が大きくされた締結穴とを形成しておき、２次成形体の樹脂が導入穴から導入されて締結穴に充填されることで、１次および２次の成形体が互いに係合され、見切り部の接合強度を高めることができるようになっている。 Conventionally, in a two-color (multicolor) molding method, an undercut structure has been proposed in which the other resin enters one resin side and is engaged with each other (for example, see Patent Document 1).
In the two-color molding method of Patent Document 1, an introduction hole and a fastening hole having a large cross-sectional area continuous with the introduction hole are formed in the primary molded body, and the resin of the secondary molded body is introduced from the introduction hole. By being introduced and filled in the fastening holes, the primary and secondary molded bodies are engaged with each other, and the joining strength of the parting portion can be increased.

特開平１０−３２３８６０号公報Japanese Patent Laid-Open No. 10-323860

しかしながら、特許文献１の二色成形法では、成形品を取り出すためにスライドコアを設ける必要があるなど、金型構造が複雑になってしまうという問題がある。   However, the two-color molding method of Patent Document 1 has a problem that the mold structure becomes complicated, for example, it is necessary to provide a slide core to take out a molded product.

本発明の目的は、金型構造を複雑にすることなく見切り部にアンダーカット構造が形成でき、接合強度の向上を図ることができる多色成形品、およびその成形方法を提供することにある。   An object of the present invention is to provide a multicolor molded product capable of forming an undercut structure at a parting portion without complicating a mold structure and improving a bonding strength, and a molding method thereof.

本発明の多色成形品の成形方法は、少なくとも二種類の樹脂材料を積層して成形される多色成形品の成形方法であって、少なくとも固定金型、可動金型、および移動コアで形成された第１のキャビティに第１の樹脂材料を充填し、互いに対向する一対の凸部を有する第１の成形部を成形する第１の充填工程と、第１の充填工程の後に、前記移動コアを後退させ、前記一対の凸部の後方に第２のキャビティを形成するコアバック工程と、コアバック工程の後に、前記第２のキャビティに第２の樹脂材料を充填し、この充填圧により前記一対の凸部を互いの先端同士が近づくように変形させるとともに、これら一対の凸部間に挟持された被挟持部を有する第２の成形部を成形する第２の充填工程とを備えたことを特徴とする。   The molding method of a multicolor molded product of the present invention is a molding method of a multicolor molded product molded by laminating at least two kinds of resin materials, and is formed by at least a fixed mold, a movable mold, and a moving core A first filling step of filling the first resin material into the first resin material and forming a first molding part having a pair of convex portions facing each other, and the movement after the first filling step A core back step of retracting the core to form a second cavity behind the pair of convex portions, and after the core back step, the second cavity is filled with a second resin material, and this filling pressure A second filling step of deforming the pair of convex portions so that the tips of the pair come close to each other, and molding a second molded portion having a sandwiched portion sandwiched between the pair of convex portions. It is characterized by that.

ここで、第１、第２の充填工程とは、多色（二色）成形における１次材および２次材の充填工程のみを意味するものではなく、多色成形において複数回実行される樹脂材料の充填のうち、前後して実行される任意の充填工程を意味する。例えば、三次以上の充填工程を有する多色成形において、本発明の第１、第２の充填工程により、２次材および３次材の充填が実行されてもよく、１次材および２次材の充填と２次材および３次材の充填とが実行されてもよい。
また、第１および第２のキャビティに第１および第２の樹脂材料を充填する方法としては、適宜選択可能であるが、射出充填が生産性、賦形性に優れており、この点で射出充填が好ましい。 Here, the first and second filling steps do not mean only the filling step of the primary material and the secondary material in the multicolor (two-color) molding, but a resin that is executed a plurality of times in the multicolor molding. It means an arbitrary filling process performed before or after filling the material. For example, in multicolor molding having a tertiary or higher filling step, the filling of the secondary material and the tertiary material may be performed by the first and second filling steps of the present invention, and the primary material and the secondary material. And filling of the secondary material and the tertiary material may be performed.
Further, as a method of filling the first and second cavities with the first and second resin materials, it can be selected as appropriate. However, injection filling is excellent in productivity and shaping, and in this respect, injection is performed. Filling is preferred.

この発明によれば、第１の成形部の一対の凸部が第２の樹脂材料の充填圧により互いの先端同士が近づくように変形し、これら一対の凸部で第２の成形部の被挟持部を挟持することで、第１および第２の成形部の見切り部における接合強度が向上する。
従って、コアバック可能な移動コアを備えるだけの簡単な構造の金型を用いて、見切り部にアンダーカット構造が形成でき、第１および第２の成形部間の接合強度の向上を図ることができる。 According to the present invention, the pair of convex portions of the first molding portion is deformed so that the tips of the first molding portions approach each other due to the filling pressure of the second resin material, and the pair of convex portions covers the second molding portion. By sandwiching the sandwiching portion, the bonding strength at the parting portion of the first and second molding portions is improved.
Therefore, an undercut structure can be formed in the parting part using a mold having a simple structure that only includes a movable core that can be core-backed, and the bonding strength between the first and second molding parts can be improved. it can.

ここで、第１の成形部に形成する一対の凸部は、見切り部に少なくとも１組設けられていればよく、また複数組の凸部が設けられていてもよい。
また、凸部の形状は、第２の樹脂材料の充填圧により互いの先端同士が近づくように変形可能なものであれば特に限定されるものではなく、例えば、リブやボス、立壁、柱状等のいずれの形状であってもよい。
さらに、一対の凸部の高さ、幅、長さ、凸部同士の間隔は、第２の樹脂材料の充填圧により互いの先端同士が近づくように変形可能なものであれば特に限定されるものではない。ただし、見切り部の接合強度が十分確保できる範囲において、凸部の高さ寸法が高く、凸部先端の間隔が狭く、また第１の樹脂材料の剛性が小さいほど、凸部が第２の樹脂材料の充填圧により変形しやすくなる。 Here, the pair of convex portions formed on the first molding portion may be provided in at least one set in the parting portion, or a plurality of sets of convex portions may be provided.
In addition, the shape of the convex portion is not particularly limited as long as it can be deformed so that the tips of each other approach due to the filling pressure of the second resin material, for example, ribs, bosses, standing walls, columnar shapes, etc. Either shape may be sufficient.
Furthermore, the height, width, length, and spacing between the protrusions of the pair of protrusions are particularly limited as long as they can be deformed so that the tips of each other approach due to the filling pressure of the second resin material. It is not a thing. However, as long as the joining strength of the parting part can be sufficiently secured, the convex part becomes the second resin as the height of the convex part is high, the interval between the convex part tips is narrow, and the rigidity of the first resin material is small. It becomes easy to be deformed by the filling pressure of the material.

以上において、前記第１の樹脂材料の充填完了直前から充填完了後における当該第１の樹脂材料の内部が固化する前の任意の時点において、当該第１の樹脂材料内に加圧流体を注入し、前記一対の凸部の基端部に中空部を形成する流体注入工程を備えることが望ましい。
ここで、第１の樹脂材料内に注入する加圧流体としては、窒素、炭酸ガス、空気、水蒸気、水等が利用可能である。
このような構成によれば、一対の凸部の基端部に中空部を形成することで、第２の樹脂材料の充填圧により中空部がつぶれ、凸部が変形しやすくできる。
この際、流体注入工程は、コアバック工程の前後いずれのタイミングで実行されてもよい。また、一対の凸部の基端部に見切り面よりも突出して形成された台座部分を設け、この台座部分から一対の凸部が突出するように形成し、台座部分に中空部を形成すれば、中空部が容易に形成できる。この場合の中空部の大きさは、台座部分の容積に対し、５〜５０％であることが好ましい。 The pressurized fluid is injected into the first resin material at any time before the solidification of the interior of the first resin material immediately after the completion of the filling of the first resin material. It is desirable to provide a fluid injection step of forming a hollow portion at the base end portion of the pair of convex portions.
Here, nitrogen, carbon dioxide, air, water vapor, water, or the like can be used as the pressurized fluid injected into the first resin material.
According to such a configuration, by forming the hollow portion at the base end portion of the pair of convex portions, the hollow portion is crushed by the filling pressure of the second resin material, and the convex portion can be easily deformed.
At this time, the fluid injection process may be executed at any timing before and after the core back process. In addition, if a base portion formed so as to protrude from the parting surface is provided at the base end portion of the pair of convex portions, the pair of convex portions protrude from the base portion, and a hollow portion is formed in the base portion. The hollow part can be easily formed. In this case, the size of the hollow portion is preferably 5 to 50% with respect to the volume of the pedestal portion.

また、前記第１の樹脂材料の充填完了直前から充填完了後における当該第１の樹脂材料の内部が固化する前の任意の時点において、前記移動コアを後退させて前記一対の凸部の基端部を膨張させる膨張工程を備えるようにしてもよい。
ここで、第１および第２樹脂材料は、熱可塑性材料であればよく、例えばポレオレフィン、ポリアミド、ポリエステル、ポリスチレン、ポリカーボネート、ポリアリーレンスルフィド等の熱可塑性樹脂や、エチレン・αオレフィン共重合エラストマー、オレフィン系熱可塑性エラストマー、ポリエステル系熱可塑性エラストマー、ＳＥＢＳ、ＳＢＳ、ＳＥＰＳ等のスチレン系エラストマー等の各種熱可塑性エラストマー、およびそれらの混合物を用いることができる。また、必要に応じて無機、有機充填材を配合してもよい。
この際、第１の樹脂材料として膨張性材料、例えば平均繊維長が１mm以上の繊維を５重量％以上、好ましくは１０〜５０重量％以上含み、スプリングバックする材料を用いれば、移動コアを後退させた部分に第１の樹脂材料が膨張するようにできる。
また、前記第１の樹脂材料は、発泡性材料からなり、この発泡性材料の発泡により前記膨張工程における前記一対の凸部の基端部が膨張するようにしてもよい。
このような構成によれば、一対の凸部の基端部を膨張（発泡）させることで、膨張させた部分が第２の樹脂材料の充填圧によりつぶれ、凸部が変形しやすくできる。 Further, at any time before the inside of the first resin material is solidified immediately after the completion of the filling of the first resin material, the moving core is retracted to be proximal ends of the pair of convex portions. You may make it provide the expansion process which expands a part.
Here, the first and second resin materials may be thermoplastic materials, for example, thermoplastic resins such as polyolefin, polyamide, polyester, polystyrene, polycarbonate, polyarylene sulfide, ethylene / α-olefin copolymer elastomer, Various thermoplastic elastomers such as olefin-based thermoplastic elastomers, polyester-based thermoplastic elastomers, styrene-based elastomers such as SEBS, SBS, and SEPS, and mixtures thereof can be used. Moreover, you may mix | blend an inorganic and organic filler as needed.
In this case, if the first resin material is an expandable material, for example, a fiber containing an average fiber length of 1 mm or more and containing 5% by weight or more, preferably 10 to 50% by weight or more, and a springback material is used, the moving core is retracted. The first resin material can be expanded in the portion that has been caused.
The first resin material may be made of a foamable material, and the base end portions of the pair of convex portions in the expansion step may be expanded by foaming of the foamable material.
According to such a configuration, by expanding (foaming) the base end portions of the pair of convex portions, the expanded portions are crushed by the filling pressure of the second resin material, and the convex portions can be easily deformed.

一方、本発明の多色成形品は、少なくとも二種類の樹脂材料を積層して成形される多色成形品であって、少なくとも固定金型、可動金型、および移動コアで形成された第１のキャビティに第１の樹脂材料を充填して成形され、互いに対向する一対の凸部を有した第１の成形部と、前記移動コアをコアバックさせて前記一対の凸部の後方に形成された第２のキャビティに第２の樹脂材料を充填して成形された第２の成形部とを備え、前記第１の成形部の一対の凸部は、前記第２の樹脂材料の充填圧により互いの先端同士が近づくように変形され、前記第２の成形部は、前記一対の凸部間に挟持された被挟持部を有していることを特徴とする。   On the other hand, the multicolor molded product of the present invention is a multicolor molded product formed by laminating at least two kinds of resin materials, and is a first product formed of at least a fixed mold, a movable mold, and a moving core. The cavity is filled with the first resin material, and is formed behind the pair of convex portions by forming a first molded portion having a pair of convex portions opposed to each other and the moving core as a core back. And a second molded portion formed by filling the second cavity with the second resin material, and the pair of convex portions of the first molded portion is formed by the filling pressure of the second resin material. The second molded part is deformed so that the tips of each other approach each other, and the second molded part has a sandwiched part sandwiched between the pair of convex parts.

この発明によれば、上述した効果と同様の効果、すなわち見切り部にアンダーカット構造が形成でき、第１および第２の成形部間の接合強度が向上されるという効果を得ることができる。   According to the present invention, the same effect as described above, that is, an undercut structure can be formed in the parting portion, and an effect that the bonding strength between the first and second molded portions is improved can be obtained.

以下、本発明の各実施形態を図面に基づいて説明する。なお、各実施形態において、既説した同一部材には同一符号を付すことにし、それらの重複する説明を避けるために、その説明を省略または簡略化する。   Hereinafter, each embodiment of the present invention will be described with reference to the drawings. In each embodiment, the same reference numerals are given to the same members already described, and the description thereof is omitted or simplified in order to avoid overlapping description thereof.

〔第１実施形態〕
図１は、本発明の第１実施形態に係る多色成形品１およびその成形に用いる金型１０を示す断面図である。図２(Ａ)〜(Ｃ)は、多色成形品１の成形手順を示す断面図である。
図１において、多色成形品１は、第１の樹脂材料Ｒ１で成形された第１成形部２と、第２の樹脂材料Ｒ２で成形された第２成形部３とを備え、これら第１および第２の成形部２，３が一体化されている。
第１成形部２は、適宜な厚さ寸法を有し平板状に形成された基部２Ａと、この基部２Ａの表裏面のうち一方（図１中、上方）の面に突出した一対の凸部２Ｂとを有している。第２成形部３は、第１成形部２の一対の凸部２Ｂ上に積層されており、一対の凸部２Ｂ間に挟持された被挟持部３Ａと、先端側の凹部３Ｂとを有している。 [First Embodiment]
FIG. 1 is a cross-sectional view showing a multicolor molded product 1 and a mold 10 used for the molding according to the first embodiment of the present invention. 2A to 2C are cross-sectional views illustrating the molding procedure of the multicolor molded product 1.
In FIG. 1, a multicolor molded product 1 includes a first molded part 2 molded from a first resin material R1 and a second molded part 3 molded from a second resin material R2, and these first molded parts 1 And the 2nd shaping | molding parts 2 and 3 are integrated.
The first molding portion 2 has a base portion 2A having an appropriate thickness and formed in a flat plate shape, and a pair of convex portions protruding on one (upper side in FIG. 1) of the front and back surfaces of the base portion 2A. 2B. The second molded part 3 is laminated on the pair of convex parts 2B of the first molded part 2, and has a sandwiched part 3A sandwiched between the pair of convex parts 2B and a concave part 3B on the tip side. ing.

また、多色成形品１を成形するための金型１０は、図示しない固定ダイプレートに固定された固定金型１１と、図示しない移動ダイプレートに設けられた可動金型１２と、可動金型１２に挿通され、固定金型１１に対して進退自在に設けられた移動コア１３とを有して構成されている。すなわち、可動金型１２には、多色成形品１の一対の凸部２Ｂおよび第２成形部３の形状に応じた挿通孔１２Ａが形成されており、この挿通孔１２Ａに移動コア１３が摺動自在に挿通され、図示しない駆動装置に連結された移動コア１３が進退移動されるようになっている。また、移動コア１３の先端である固定金型１１側には、第１成形部２の一対の凸部２Ｂおよび第２成形部３の凹部３Ｂを形成する突出部１３Ａが形成されている。そして、固定金型１１あるいは可動金型１２には、図示しない射出装置に接続されたスプルーブッシュ（不図示）が設けられており、このスプルーブッシュを介して金型１０内に樹脂材料Ｒ１，Ｒ２が射出されるようになっている。   A mold 10 for molding the multicolor molded product 1 includes a fixed mold 11 fixed to a fixed die plate (not shown), a movable mold 12 provided on a movable die plate (not shown), and a movable mold. 12 and a movable core 13 provided to be movable forward and backward with respect to the fixed mold 11. That is, the movable mold 12 is formed with an insertion hole 12A corresponding to the shape of the pair of convex portions 2B and the second molding portion 3 of the multicolor molded product 1, and the movable core 13 is slid into the insertion hole 12A. A movable core 13 that is movably inserted and connected to a driving device (not shown) is moved forward and backward. Further, on the fixed mold 11 side, which is the tip of the moving core 13, a protruding portion 13A that forms a pair of convex portions 2B of the first molding portion 2 and a concave portion 3B of the second molding portion 3 is formed. The fixed mold 11 or the movable mold 12 is provided with a sprue bush (not shown) connected to an injection device (not shown), and the resin materials R1, R2 are placed in the mold 10 via the sprue bush. Is to be injected.

次に本実施形態の多色成形品１の成形手順について説明する。
まず、図２(Ａ)に示すように、固定金型１１および可動金型１２を、多色成形品１の基部２Ａの厚さ寸法に応じた間隔を介して対向させた状態で型締めする。そして、移動コア１３を凸部２Ｂの寸法に応じた位置まで前進させる。これにより、固定金型１１、可動金型１２、および移動コア１３によって囲まれた第１キャビティ２１が形成される。
次に、図示しない射出装置からスプルーブッシュを介して第１キャビティ２１に、溶融させた第１の樹脂材料Ｒ１を射出し、充填する。これにより、第１の充填工程が実施され、多色成形品１の基部２Ａおよび凸部２Ｂが第１の樹脂材料Ｒ１から成形される。
ここで、第１の樹脂材料Ｒ１は、発泡性材料から構成されている。 Next, the molding procedure of the multicolor molded product 1 of the present embodiment will be described.
First, as shown in FIG. 2A, the fixed mold 11 and the movable mold 12 are clamped in a state where they are opposed to each other with an interval corresponding to the thickness dimension of the base portion 2A of the multicolor molded product 1. . And the movable core 13 is advanced to the position according to the dimension of the convex part 2B. As a result, the first cavity 21 surrounded by the fixed mold 11, the movable mold 12, and the moving core 13 is formed.
Next, the melted first resin material R1 is injected and filled into the first cavity 21 from a not-shown injection device via the sprue bush. Thereby, a 1st filling process is implemented and 2 A of base parts and the convex part 2B of the multicolor molded product 1 are shape | molded from 1st resin material R1.
Here, the first resin material R1 is made of a foamable material.

第１の充填工程が終了する直前、または直後における第１の樹脂材料Ｒ１が冷却固化する前に、図２(Ｂ)に示すように、駆動装置を駆動して移動コア１３を若干量だけ後退させる。これにより、発泡性材料から構成された第１の樹脂材料Ｒ１の一部である一対の凸部２Ｂの基端部２Ｃが発泡し、移動コア１３側に向かって膨張する（膨張工程）。
なお、第１の樹脂材料Ｒ１は、発泡性材料に限らず、繊維を含んでスプリングバックする膨張性材料から構成されていてもよい。 Before the first resin material R1 immediately before or after the completion of the first filling process is cooled and solidified, as shown in FIG. Let Thereby, the base end part 2C of a pair of convex part 2B which is a part of 1st resin material R1 comprised from the foamable material foams, and expands toward the moving core 13 side (expansion process).
The first resin material R1 is not limited to a foamable material, and may be composed of an inflatable material that includes fibers and springs back.

次に、図２(Ｃ)に示すように、移動コア１３を第２成形部の寸法に応じた量だけ後退させ、先に充填された第１の樹脂材料Ｒ１、可動金型１２、および移動コア１３によって囲まれた第２キャビティ２２を形成する（コアバック工程）。
コアバック工程終了と同時、またはその直後に、射出装置からスプルーブッシュを介して第２キャビティ２２に、溶融させた第２の樹脂材料Ｒ２を射出し、充填する。これにより、第２の充填工程が実施され、この第２の樹脂材料Ｒ２の射出圧（充填圧）により、膨張していた基端部２Ｃがつぶれ、一対の凸部２Ｂが互いの先端同士が近づくように変形する。そして、一対の凸部２Ｂ間に充填された第２の樹脂材料Ｒ２で第２成形部３の被挟持部３Ａが形成されるとともに、移動コア１３の突出部１３Ａで凹部３Ｂが形成される。 Next, as shown in FIG. 2 (C), the movable core 13 is retracted by an amount corresponding to the dimension of the second molding part, and the first resin material R1, the movable mold 12, and the previously filled are moved. A second cavity 22 surrounded by the core 13 is formed (core back step).
Simultaneously with or immediately after the end of the core back process, the molten second resin material R2 is injected from the injection device into the second cavity 22 through the sprue bushing and filled. As a result, the second filling step is carried out, and due to the injection pressure (filling pressure) of the second resin material R2, the expanded base end portion 2C is crushed, and the pair of convex portions 2B are brought into contact with each other. Deform to approach. The sandwiched portion 3A of the second molded portion 3 is formed by the second resin material R2 filled between the pair of convex portions 2B, and the concave portion 3B is formed by the protruding portion 13A of the moving core 13.

以上の各工程が終了後、図示しない移動ダイプレートを駆動して、固定金型１１から可動金型１２を離隔させて型開きし、多色成形品１を金型１０から取り出す。
以上により、多色成形品１の成形が完了する。 After the above steps are completed, a movable die plate (not shown) is driven, the movable mold 12 is separated from the fixed mold 11 and the mold is opened, and the multicolor molded product 1 is taken out from the mold 10.
Thus, the molding of the multicolor molded product 1 is completed.

なお、多色成形品１の第２成形部３としては、上記で説明したものに限らず、図３に示した形態としてもよい。
図３(Ａ)〜(Ｃ)は、本実施形態の変形例に係る成形手順を示す断面図である。
すなわち、図３に示す金型１０Ａでは、移動コア１３が移動コア本体１３Ｂと中ピン１３Ｃとを有して構成されており、移動コア本体１３Ｂに対して中ピン１３Ｃが進退移動可能に支持されている。 In addition, as the 2nd shaping | molding part 3 of the multicolor molded product 1, not only what was demonstrated above but the form shown in FIG. 3 is good.
3A to 3C are cross-sectional views illustrating a molding procedure according to a modification of the present embodiment.
That is, in the mold 10A shown in FIG. 3, the moving core 13 is configured to have a moving core body 13B and a middle pin 13C, and the middle pin 13C is supported so as to be movable forward and backward with respect to the moving core body 13B. ing.

金型１０Ａにおける多色成形品１の成形手順は、図３(Ａ)に示すように、移動コア１３の中ピン１３Ｃを第１成形部２の一対の凸部２Ｂに対応して移動コア本体１３Ｂよりも固定金型１１側に突出させ、形成された第１キャビティ２１に第１の樹脂材料Ｒ１を射出し、充填する（第１の充填工程）。
この後、図３(Ｂ)に示すように、移動コア１３の中ピン１３Ｃを後退させて、一対の凸部２Ｂの基端部２Ｃを発泡させて膨張させる（膨張行程）。
次に、図３(Ｂ)に示すように、移動コア本体１３Ｂおよび中ピン１３Ｃを互いの先端が略同一位置になるように後退させ（コアバック工程）、形成された第２キャビティ２２に第２の樹脂材料Ｒ１を射出し、充填する（第２の充填工程）。この第２の樹脂材料Ｒ２の射出圧（充填圧）により、膨張していた基端部２Ｃがつぶれ、一対の凸部２Ｂが互いの先端同士が近づくように変形する。そして、一対の凸部２Ｂ間に充填された第２の樹脂材料Ｒ２で第２成形部３の被挟持部３Ａが形成されるとともに、第２成形部３の先端（図３中、上端）が平坦に形成される。 As shown in FIG. 3A, the molding procedure of the multicolor molded product 1 in the mold 10A is such that the middle pin 13C of the movable core 13 corresponds to the pair of convex portions 2B of the first molded portion 2 and the movable core body. The first resin material R1 is injected and filled into the first cavity 21 formed so as to protrude from the side of the fixed mold 11 rather than 13B (first filling step).
Thereafter, as shown in FIG. 3B, the middle pin 13C of the moving core 13 is retracted, and the base end portions 2C of the pair of convex portions 2B are expanded and expanded (expansion stroke).
Next, as shown in FIG. 3 (B), the movable core body 13B and the middle pin 13C are retracted so that their tips are substantially at the same position (core back step), and the second cavity 22 is The second resin material R1 is injected and filled (second filling step). By the injection pressure (filling pressure) of the second resin material R2, the expanded base end portion 2C is crushed, and the pair of convex portions 2B are deformed so that the tips of each other approach each other. And while the to-be-clamped part 3A of the 2nd shaping | molding part 3 is formed with 2nd resin material R2 with which it filled between a pair of convex parts 2B, the front-end | tip (upper end in FIG. 3) of the 2nd shaping | molding part 3 is formed. It is formed flat.

以上の本実施形態によれば以下の効果がある。
（１）第１成形部２の一対の凸部２Ｂが第２の樹脂材料Ｒ２の射出圧により互いの先端同士が近づくように変形し、これら一対の凸部２Ｂで第２成形部３の被挟持部３Ａを挟持することで、第１および第２の成形部２，３の接合面（見切り部）における接合強度が向上する。従って、移動コア１３を備えた簡単な構造の金型１０を用いて、見切り部にアンダーカット構造が形成でき、第１および第２の成形部２，３間の接合強度の向上を図ることができる。 According to the above embodiment, the following effects are obtained.
(1) The pair of convex portions 2B of the first molding portion 2 is deformed so that the tips of the two molding portions 2B approach each other due to the injection pressure of the second resin material R2, and the pair of convex portions 2B are covered by the second molding portion 3 By sandwiching the sandwiching part 3A, the joint strength at the joint surfaces (parting parts) of the first and second molding parts 2 and 3 is improved. Therefore, an undercut structure can be formed at the parting portion using the mold 10 having a simple structure including the moving core 13, and the bonding strength between the first and second molding portions 2 and 3 can be improved. it can.

（２）膨張工程において、一対の凸部２Ｂの基端部２Ｃを膨張させることで、膨張して剛性が低下した基端部２Ｃが第２の樹脂材料Ｒ１の充填圧によりつぶれ、一対の凸部２Ｂが変形しやすくでき、より確実にアンダーカット構造が形成できる。 (2) In the expansion step, by expanding the base end portions 2C of the pair of convex portions 2B, the base end portion 2C, which has expanded and has reduced rigidity, is crushed by the filling pressure of the second resin material R1, and the pair of convex portions The part 2B can be easily deformed, and an undercut structure can be more reliably formed.

（３）図３に示した移動コア１３を用いれば、第２成形部３を任意の形状にすることができ、所望の外形を有する成形品を成形することができる。 (3) If the moving core 13 shown in FIG. 3 is used, the 2nd shaping | molding part 3 can be made into arbitrary shapes, and the molded article which has a desired external shape can be shape | molded.

〔第２実施形態〕
次に、本発明の第２実施形態に係る多色成形品１Ａについて、図４に基づいて説明する。
図４(Ａ)〜(Ｃ)は、第２実施形態の多色成形品１Ａの成形手順を示す断面図である。
図４において、多色成形品１Ａは、一対の凸部２Ｂの基端部分に基部２Ａよりも厚さ寸法が大きい台座部２Ｄを有し、この台座部２Ｄ内に中空部２Ｅが形成されている点が前述の第１実施形態の多色成形品１と相違している。
そして、金型１０には、図示しないガス圧入装置に接続されたガス圧入ピン（不図示）が設けられており、このガス圧入ピンを介して第１の樹脂材料Ｒ１内に加圧流体としての加圧ガスを注入することで、台座部２Ｄ内に中空部２Ｅが形成されるようになっている。 [Second Embodiment]
Next, a multicolor molded product 1A according to the second embodiment of the present invention will be described with reference to FIG.
4A to 4C are cross-sectional views showing the molding procedure of the multicolor molded product 1A of the second embodiment.
In FIG. 4, the multicolor molded product 1A has a pedestal portion 2D having a thickness dimension larger than that of the base portion 2A at the base end portion of the pair of convex portions 2B, and a hollow portion 2E is formed in the pedestal portion 2D. This is different from the multicolor molded product 1 of the first embodiment described above.
The mold 10 is provided with a gas press-fitting pin (not shown) connected to a gas press-fitting device (not shown), and the first resin material R1 is used as a pressurized fluid via the gas press-fitting pin. By injecting the pressurized gas, the hollow portion 2E is formed in the pedestal portion 2D.

以上のような多色成形品１Ａの成形手順としては、まず、図４(Ａ)に示すように、移動コア１３を台座部２Ｄおよび凸部２Ｂの寸法に応じた位置まで前進させ、固定金型１１、可動金型１２、および移動コア１３によって囲まれた第１キャビティ２１を形成する。
次に、図示しない射出装置からスプルーブッシュを介して第１キャビティ２１に、溶融させた第１の樹脂材料Ｒ１を射出し、充填する。これにより、第１の充填工程が実施され、基部２Ａ、台座部２Ｄ、および凸部２Ｂが第１の樹脂材料Ｒ１から成形される。 As a molding procedure of the multicolor molded product 1A as described above, first, as shown in FIG. 4 (A), the movable core 13 is advanced to a position corresponding to the dimensions of the pedestal portion 2D and the convex portion 2B. A first cavity 21 surrounded by the mold 11, the movable mold 12, and the moving core 13 is formed.
Next, the melted first resin material R1 is injected and filled into the first cavity 21 from a not-shown injection device via the sprue bush. Thereby, a 1st filling process is implemented and 2 A of base parts, the base part 2D, and the convex part 2B are shape | molded from 1st resin material R1.

第１の充填工程が終了する直前、または直後における第１の樹脂材料Ｒ１が冷却固化する前に、図４(Ｂ)に示すように、駆動装置を駆動して移動コア１３を若干量だけ後退させるとともに、ガス圧入ピンを介して台座部２Ｄに加圧ガスを注入し、中空部２Ｅを形成する（流体注入工程）。
次に、図４(Ｃ)に示すように、移動コア１３を第２成形部の寸法に応じた量だけ後退させ、先に充填された第１の樹脂材料Ｒ１、可動金型１２、および移動コア１３によって囲まれた第２キャビティ２２を形成する（コアバック工程）。 Before the first resin material R1 immediately before or after the completion of the first filling process is cooled and solidified, as shown in FIG. 4 (B), the driving device is driven to move the moving core 13 back slightly. At the same time, pressurized gas is injected into the pedestal portion 2D through the gas injection pin to form the hollow portion 2E (fluid injection step).
Next, as shown in FIG. 4 (C), the movable core 13 is moved backward by an amount corresponding to the dimension of the second molding part, and the first resin material R1, the movable mold 12 and the previously filled are moved. A second cavity 22 surrounded by the core 13 is formed (core back step).

コアバック工程終了と同時、またはその直後に、射出装置からスプルーブッシュを介して第２キャビティ２２に、溶融させた第２の樹脂材料Ｒ２を射出し、充填する。これにより、第２の充填工程が実施され、この第２の樹脂材料Ｒ２の射出圧（充填圧）により、中空部２Ｅがつぶれ、一対の凸部２Ｂが互いの先端同士が近づくように変形する。そして、一対の凸部２Ｂ間に充填された第２の樹脂材料Ｒ２で第２成形部３の被挟持部３Ａが形成されるとともに、移動コア１３の突出部１３Ａで凹部３Ｂが形成される。
最後に、金型１０を型開きし、多色成形品１Ａを取り出して成形が完了する。 Simultaneously with or immediately after the end of the core back process, the molten second resin material R2 is injected from the injection device into the second cavity 22 through the sprue bushing and filled. Thus, the second filling step is performed, and the injection pressure (filling pressure) of the second resin material R2 causes the hollow portion 2E to be crushed and the pair of convex portions 2B to be deformed so that the tips of each other approach each other. . The sandwiched portion 3A of the second molded portion 3 is formed by the second resin material R2 filled between the pair of convex portions 2B, and the concave portion 3B is formed by the protruding portion 13A of the moving core 13.
Finally, the mold 10 is opened, the multicolor molded product 1A is taken out, and the molding is completed.

本発明の実施例として、以下に示すような構成を採用した。
［成形材料および成形条件］
射出成形機としては、ガス注入装置（出光製ＧＩＭ）付き、４５０ｔｏｎ成形機を用いた。
金型としては、前記実施形態の図４に示す金型を用いた。
成形温度としては、２３０℃とし、金型温度としては、４０℃として射出成形した。 As an example of the present invention, the following configuration was adopted.
[Molding materials and molding conditions]
As the injection molding machine, a 450 ton molding machine with a gas injection device (Idemitsu GIM) was used.
As the mold, the mold shown in FIG. 4 of the above embodiment was used.
The molding temperature was 230 ° C., and the mold temperature was 40 ° C. for injection molding.

［評価方法］
成形品の見切り部を切断して、その断面を目視観察した。 [Evaluation methods]
A parting part of the molded product was cut and the cross section was visually observed.

［実施例１］
第１の樹脂材料である第１次材としては、ポリプロピレン（出光石油化学(株)製Ｊ−９５０ＨＰ）を用い、第２の樹脂材料である第２次材としては、上記ポリプロピレンにカーボンブラックを配合して黒着色したものを用いた。
前記第２実施形態（図４）と同様の固定金型、可動金型、移動コアに囲まれた第１キャビティに第１次材を射出充填した。充填完了から１秒後に、一対の凸部にはさまれた台座部のほぼ中央になるようにガス圧入ピンをキャビティ内に突き出し、台座部に加圧ガスを注入して中空部を形成した。そして、第１次材を冷却固化させた後、移動コアを後退させて形成した第２キャビティに第２次材を射出充填した。充填した樹脂を十分に冷却させた後に、金型を開いて成形体を取り出し、台座部を切断して断面を観察した。 [Example 1]
As the primary material that is the first resin material, polypropylene (J-950HP manufactured by Idemitsu Petrochemical Co., Ltd.) is used, and as the secondary material that is the second resin material, carbon black is added to the polypropylene. What was mixed and black-colored was used.
The first material was injected and filled into a first cavity surrounded by a fixed mold, a movable mold, and a moving core similar to the second embodiment (FIG. 4). One second after the completion of filling, a gas press-fit pin was protruded into the cavity so as to be approximately at the center of the pedestal portion sandwiched between the pair of convex portions, and pressurized gas was injected into the pedestal portion to form a hollow portion. Then, after the primary material was cooled and solidified, the secondary material was injected and filled into the second cavity formed by retracting the moving core. After the filled resin was sufficiently cooled, the mold was opened, the molded body was taken out, the pedestal portion was cut, and the cross section was observed.

［比較例１］
第１次材と第２次材との見切り部が直線であり、第１次材内に中空部を形成しない以外は、実施例１と同様に成形した。 [Comparative Example 1]
Molding was performed in the same manner as in Example 1 except that the parting portion between the primary material and the secondary material was a straight line, and no hollow portion was formed in the primary material.

［実施例２］
第１の樹脂材料である第１次材としては、ポリプロピレン（出光石油化学(株)製Ｊ−９５０ＨＰ）に発泡剤を１重量％含有させた発泡性材料を用い、第２の樹脂材料である第２次材としては、上記ポリプロピレンにカーボンブラックを配合して黒着色したものを用いた。
前記第１実施形態（図２）と同様の固定金型、可動金型、移動コアに囲まれた第１キャビティに第１次材を射出充填した。充填完了後に、移動コアを３mmだけ後退させ、一対の凸部の基端部を約２倍の体積に発泡させた。そして、第１次材を冷却固化させた後に、さらに移動コアを後退させて形成した第２キャビティに第２次材を射出充填した。充填した樹脂を十分に冷却させた後に、金型を開いて成形体を取り出し、一対の凸部の基端部を切断して断面を観察した。 [Example 2]
The primary material, which is the first resin material, is a second resin material using a foamable material containing 1 wt% of a foaming agent in polypropylene (J-950HP manufactured by Idemitsu Petrochemical Co., Ltd.). As the secondary material, the above polypropylene was mixed with carbon black and colored black.
The primary material was injected and filled into a first cavity surrounded by a fixed mold, a movable mold, and a moving core similar to the first embodiment (FIG. 2). After completion of the filling, the moving core was retracted by 3 mm, and the base end portions of the pair of convex portions were foamed to about twice the volume. Then, after the primary material was cooled and solidified, the secondary material was injected and filled into the second cavity formed by further retracting the moving core. After the filled resin was sufficiently cooled, the mold was opened, the molded body was taken out, the base end portions of the pair of convex portions were cut, and the cross section was observed.

［評価］
実施例１において、台座部の切断面を観察した結果、中空部がつぶれ、第１次材からなる一対の凸部の先端が近づいて形成されたアンダーカット構造が第２次材との見切り部に確認できた。
実施例２において、一対の凸部の基端部の切断面を観察した結果、発泡させた基端部がつぶれ、第１次材からなる一対の凸部の先端が近づいて形成されたアンダーカット構造が第２次材との見切り部に確認できた。
比較例１においては、第１次材と第２次材との見切り部にアンダーカット構造が確認できなかった。 [Evaluation]
In Example 1, as a result of observing the cut surface of the pedestal part, the hollow part is crushed, and the undercut structure formed by approaching the tips of the pair of convex parts made of the primary material is a parting part with the secondary material I was able to confirm.
In Example 2, as a result of observing the cut surfaces of the base end portions of the pair of convex portions, the foamed base end portions are crushed, and the tip ends of the pair of convex portions made of the primary material are formed close to each other. The structure was confirmed at the parting with the secondary material.
In Comparative Example 1, an undercut structure could not be confirmed at the parting portion between the primary material and the secondary material.

なお、本発明は前記実施形態に限定されるものではなく、本発明の目的を達成できる範囲での変形、改良等は本発明に含まれるものである。   It should be noted that the present invention is not limited to the above-described embodiment, and modifications, improvements, etc. within a scope that can achieve the object of the present invention are included in the present invention.

本発明は、自動車分野、住設分野、日用品分野、家電分野、玩具等の分野において利用可能であり、特に、自動車の内装部品に好適である。   The present invention can be used in the fields of automobiles, housing, daily necessities, home appliances, toys, and the like, and is particularly suitable for interior parts of automobiles.

本発明の第１実施形態に係る多色成形品およびその成形に用いる金型を示す断面図である。It is sectional drawing which shows the multicolor molded product which concerns on 1st Embodiment of this invention, and the metal mold | die used for the shaping | molding. (Ａ)〜(Ｃ)は、前記多色成形品の成形手順を示す断面図である。(A)-(C) are sectional drawings which show the shaping | molding procedure of the said multicolor molded article. (Ａ)〜(Ｃ)は、前記実施形態の変形例に係る成形手順を示す断面図である。(A)-(C) are sectional drawings which show the formation procedure which concerns on the modification of the said embodiment. (Ａ)〜(Ｃ)は、本発明の第２実施形態に係る多色成形品の成形手順を示す断面図である。(A)-(C) are sectional drawings which show the shaping | molding procedure of the multicolor molded product which concerns on 2nd Embodiment of this invention.

符号の説明Explanation of symbols

１，１Ａ 多色成形品
２ 第１成形部
２Ｂ 凸部
２Ｃ 基端部
２Ｅ 中空部
３ 第２成形部
３Ａ 被挟持部
１０，１０Ａ 金型
１１ 固定金型
１２ 可動金型
１３ 移動コア
２１ 第１キャビティ
２２ 第２キャビティ
Ｒ１ 第１の樹脂材料
Ｒ２ 第２の樹脂材料。 DESCRIPTION OF SYMBOLS 1,1A Multicolor molded product 2 1st shaping | molding part 2B Convex part 2C Base end part 2E Hollow part 3 2nd shaping | molding part 3A Clamping part 10,10A Mold 11 Fixed mold 12 Movable mold 13 Moving core 21 1st Cavity 22 Second cavity R1 First resin material R2 Second resin material.

Claims (5)

少なくとも二種類の樹脂材料を積層して成形される多色成形品の成形方法であって、
少なくとも固定金型、可動金型、および移動コアで形成された第１のキャビティに第１の樹脂材料を充填し、互いに対向する一対の凸部を有する第１の成形部を成形する第１の充填工程と、
第１の充填工程の後に、前記移動コアを後退させ、前記一対の凸部の後方に第２のキャビティを形成するコアバック工程と、
コアバック工程の後に、前記第２のキャビティに第２の樹脂材料を充填し、この充填圧により前記一対の凸部を互いの先端同士が近づくように変形させるとともに、これら一対の凸部間に挟持された被挟持部を有する第２の成形部を成形する第２の充填工程とを備えたことを特徴とする多色成形品の成形方法。 A molding method of a multicolor molded product formed by laminating at least two kinds of resin materials,
A first cavity formed by at least a fixed mold, a movable mold, and a moving core is filled with a first resin material, and a first molding part having a pair of convex parts facing each other is molded. Filling process;
A core back step of retracting the moving core after the first filling step to form a second cavity behind the pair of convex portions;
After the core back step, the second cavity is filled with the second resin material, and the filling pressure is used to deform the pair of protrusions so that the tips of the pair approach each other, and between the pair of protrusions. A molding method for a multicolor molded product, comprising: a second filling step of molding a second molding portion having a sandwiched portion that is sandwiched. 請求項１に記載の多色成形品の成形方法において、
前記第１の樹脂材料の充填完了直前から充填完了後における当該第１の樹脂材料の内部が固化する前の任意の時点において、当該第１の樹脂材料内に加圧流体を注入し、前記一対の凸部の基端部に中空部を形成する流体注入工程を備えたことを特徴とする多色成形品の成形方法。 In the molding method of the multicolor molded product according to claim 1,
At any time before the inside of the first resin material is solidified immediately after the completion of the filling of the first resin material, a pressurized fluid is injected into the first resin material, and the pair of A molding method for a multicolor molded product comprising a fluid injection step of forming a hollow portion at a base end portion of the convex portion. 請求項１に記載の多色成形品の成形方法において、
前記第１の樹脂材料の充填完了直前から充填完了後における当該第１の樹脂材料の内部が固化する前の任意の時点において、前記移動コアを後退させて前記一対の凸部の基端部を膨張させる膨張工程を備えたことを特徴とする多色成形品の成形方法。 In the molding method of the multicolor molded product according to claim 1,
At any time before the inside of the first resin material is solidified immediately after the filling of the first resin material is completed, the movable core is moved backward to move the base ends of the pair of convex portions. A method for forming a multicolor molded product, comprising an expansion step of expanding. 請求項３に記載の多色成形品の成形方法において、
前記第１の樹脂材料は、発泡性材料からなり、この発泡性材料の発泡により前記膨張工程における前記一対の凸部の基端部が膨張することを特徴とする多色成形品の成形方法。 In the molding method of the multicolor molded product according to claim 3,
The method for molding a multicolor molded product, wherein the first resin material is made of a foamable material, and the base end portions of the pair of convex portions in the expansion step are expanded by foaming of the foamable material. 少なくとも二種類の樹脂材料を積層して成形される多色成形品であって、
少なくとも固定金型、可動金型、および移動コアで形成された第１のキャビティに第１の樹脂材料を充填して成形され、互いに対向する一対の凸部を有した第１の成形部と、前記移動コアをコアバックさせて前記一対の凸部の後方に形成した第２のキャビティに第２の樹脂材料を充填して成形された第２の成形部とを備え、
前記第１の成形部の一対の凸部は、前記第２の樹脂材料の充填圧により互いの先端同士が近づくように変形され、前記第２の成形部は、前記一対の凸部間に挟持された被挟持部を有していることを特徴とする多色成形品。 A multicolor molded product formed by laminating at least two kinds of resin materials,
A first molding part having a pair of convex parts opposed to each other, filled with a first resin material in a first cavity formed of at least a fixed mold, a movable mold, and a moving core; A second molded part formed by filling the second resin material into a second cavity formed behind the pair of convex parts by core-backing the movable core;
The pair of convex portions of the first molding portion is deformed so that the tips of the first molding portions approach each other due to the filling pressure of the second resin material, and the second molding portion is sandwiched between the pair of convex portions. A multicolor molded product having a sandwiched portion.
JP2003433454A 2003-12-26 2003-12-26 Multi-colored molded article and its manufacturing method Pending JP2005186542A (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009220387A (en) * 2008-03-17 2009-10-01 Mazda Motor Corp Method for molding foamed resin molding
WO2010001994A1 (en) * 2008-07-04 2010-01-07 大和化成工業株式会社 Cushion clip
CN110789054A (en) * 2018-08-01 2020-02-14 阿尔派株式会社 Method for manufacturing sliding member
JP2020100113A (en) * 2018-12-25 2020-07-02 トヨタ自動車株式会社 Injection molding method

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009220387A (en) * 2008-03-17 2009-10-01 Mazda Motor Corp Method for molding foamed resin molding
WO2010001994A1 (en) * 2008-07-04 2010-01-07 大和化成工業株式会社 Cushion clip
JP2010014216A (en) * 2008-07-04 2010-01-21 Daiwa Kasei Kogyo Kk Cushion clip
USD779313S1 (en) 2008-07-04 2017-02-21 Daiwa Kasei Kogyo Kabushiki Kaisha Cushion clip
CN110789054A (en) * 2018-08-01 2020-02-14 阿尔派株式会社 Method for manufacturing sliding member
CN110789054B (en) * 2018-08-01 2023-03-17 阿尔派株式会社 Method for manufacturing sliding member
JP2020100113A (en) * 2018-12-25 2020-07-02 トヨタ自動車株式会社 Injection molding method
JP7099948B2 (en) 2018-12-25 2022-07-12 トヨタ自動車株式会社 Injection molding method

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