【発明の詳細な説明】［産業上の利用分野］本発明は二重射出成形品の製造方法およびそのための金
型構造に関し、より詳しくは一次射出用キャビティＡと
これと連通ずる二次射出用キャビティＢを用いる二重射
出成形品の製造方法およびそのための金型構造に関する
。[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a method for manufacturing a double injection molded product and a mold structure therefor, and more specifically, a cavity A for primary injection and a cavity A for secondary injection communicating with the cavity A for secondary injection. The present invention relates to a method for manufacturing a double injection molded product using cavity B and a mold structure therefor.
［従来技術と課題］従来、自動車部品等の軽量化要請に伴い、以前は金属を
素材としていた部品の合成樹脂化がしばしば行われつつ
ある。またー・方でそうした部品の高機能化、美観の向
上、量産性の向上、コストダウン等が同時に求められて
いる。[Prior Art and Problems] Conventionally, with the demand for weight reduction of automobile parts and the like, parts that were previously made of metal are often being made of synthetic resin. At the same time, there is a need for such parts to have higher functionality, better aesthetics, better mass production, and lower costs.
そのため合成樹脂の二重射出成形品が各種部品に用いら
れるようになって来た。Therefore, double injection molded products of synthetic resin have come to be used for various parts.
例えばエンジンのタイミングベルトカバー、マッドフラ
ップ、ワイヤハーネスプロテクタ等である。For example, engine timing belt covers, mud flaps, wire harness protectors, etc.
そして硬質合成樹脂と軟質合成樹脂及び／または色違い
合成樹脂の二重射出成形品が、その用途、機能に応じて
使われ始めている。Double injection molded products made of hard synthetic resin, soft synthetic resin, and/or different colored synthetic resins are beginning to be used depending on their purpose and function.
より具体的には例えばタイミングベルトカバーの場合、
カバー主要部を剛性の高い硬質樹脂で先ず成形し、つい
で機械振動を受は易い部分にゴム状の軟質樹脂（エラス
トマー）を成形接合して遮音及び防塵性能を高くしたも
のが提案されている。More specifically, for example, in the case of a timing belt cover,
It has been proposed that the main part of the cover is first molded with a highly rigid hard resin, and then a rubber-like soft resin (elastomer) is molded and bonded to the parts that are susceptible to mechanical vibrations to improve sound insulation and dustproof performance.
しかし、従来の二重射出成形品の製造法では、−次射出
の後、−次射出用キャビティＡを形成していた金型は必
ず型開きされるので、その時点で一次射出された第１樹
脂材料の硬化過程に伴う製品収縮（ヒケ）が生じ、二次
射出用キャビティＢを形成するための型締めの際、その
型面に一次射出された硬質樹脂成形体の表面が正確に密
着せず、僅かながら隙間を生じるので二次射出の時に硬
質樹脂成形体との接合部において第２樹脂材料が外面側
に押し出され、パリが発生するという問題点があった。However, in the conventional manufacturing method for double injection molded products, after the -second injection, the mold that forms the -second injection cavity A is always opened, so at that point, the first injection molded product Product shrinkage (sink marks) occurs during the curing process of the resin material, and when the mold is clamped to form cavity B for secondary injection, the surface of the primary injected hard resin molded object does not accurately adhere to the mold surface. First, since a slight gap is created, the second resin material is pushed out to the outside at the joint with the hard resin molded body during secondary injection, resulting in the problem of frustation.
しかも、前記隙間は一定しないため、このパリは一般に
不規則に現われるので、製品の外観を損なうという問題
点があった。Moreover, since the gap is not constant, the gaps generally appear irregularly, which poses a problem of spoiling the appearance of the product.
これらの問題点に対する対策として、二次射出段階で発
生するパリを一定形状に調整するために、硬質樹脂成形
体に予め二次射出用キャビティＢの型締め時金型壁面と
圧接可能な凸状基を設けてお（という方法が提案されて
いる（実開平１−２４７１２４）。As a countermeasure to these problems, in order to adjust the bubbles generated in the secondary injection stage to a certain shape, the hard resin molded body is pre-shaped with a convex shape that can be pressed against the mold wall surface during mold clamping of cavity B for secondary injection. A method has been proposed (Utility Model Application Publication No. 1-247124).
しかし、これでもなおパリの形状を外観美麗に調整する
ことは出来ても、パリの発生自体を完全に防止する事は
出来なかった。However, even with this method, although it was possible to adjust the shape of the paris to give a beautiful appearance, it was not possible to completely prevent the occurrence of paris itself.
そこで本発明者等は従来の成形方法を再検討してみたと
ころ、第１工程と第２工程の間で金型の一部が１８０°
反転する回転金型を使用する方法（前掲の特開平１−２
４７１２４に記載）にしても、−次射出後型開きする事
に変りはなく、第１樹脂材料は雌型に残って片面は該雌
型に付着し、片面は気中に曝されて無拘束の状態で硬化
するので、ヒケや反りを避ける事が困難である事が判っ
た。Therefore, the present inventors reexamined the conventional molding method and found that a part of the mold was turned 180 degrees between the first and second steps.
A method using a reversing rotary mold (Japanese Unexamined Patent Publication No. 1-2 mentioned above)
47124), the mold is still opened after the second injection, and the first resin material remains in the female mold and one side is attached to the female mold, and the other side is exposed to the air and is not restrained. It was found that it was difficult to avoid sink marks and warping because the material hardened in this state.
従ってこれ等の問題点を解決するには、−次射出後型開
きして冷却硬化中の第１樹脂材料に収縮する余裕を与え
ず、出来るだけ射出時の樹脂温度を保ったまましかも力
学的に拘束状態を維持しつつ二次射出する事が出来ない
かと考えた結果、型開きをしないで二次射出を可能とす
る工夫をすれば良いという結論に達し、本発明に到達し
た。Therefore, in order to solve these problems, it is necessary to open the mold after the next injection, do not give room for contraction of the first resin material that is cooling and hardening, and maintain the resin temperature at the time of injection as much as possible while maintaining the mechanical stability. As a result of considering whether it is possible to perform secondary injection while maintaining the restraint state, we came to the conclusion that it would be better to devise a method to enable secondary injection without opening the mold, and thus arrived at the present invention.
［発明の目的］本発明の目的は一次射出成形品の冷却とそれに伴う収縮
を遅らせ、二次射出によるパリの発生を防止し接合性に
優れた二重射出成形品の製造方法及びそのための金型構
造を提供するにある。[Object of the Invention] The object of the present invention is to provide a method for producing a double injection molded product which delays the cooling of the primary injection molded product and the accompanying shrinkage, prevents the occurrence of flashing due to the secondary injection, and has excellent bonding properties, and a method for producing a double injection molded product with excellent bondability. Provides type structure.
［発明の構成］本発明により、少なくとも１対の固定型／もしくは可動型と他の可動型
とで型締めして形成されたキャビティＡに第１樹脂材料
を射出成形した後、型開きせずに両型の一部をなす少な
くとも１対の小移動型が移動して形成されたキャビティ
Ｂに第２樹脂材料を射出成形する二重射出成形品の製造
方法において、第１樹脂材料が射出される時キャビティ
ＢはキャビティＡと遮断されており、第２樹脂材料が射
出される時キャビティＢはキャビティＡと一部で連通さ
れている事により第１樹脂材料と第２樹脂材料が接合す
る事を特徴とする二重射出成形品の製造方法（本発明１
）及び少なくとも１対の固定型／もしくは可動型と他の可動型
とでキャビティＡを形成すべく配置され、かつ前記各固
定型もしくは可動型が型開きせず静止のままキャビティ
Ａと連通ずるキャビティＢを形成すべく配置された小移
動型を夫々内蔵する事を特徴とする特許請求の範囲第１
項に記載の製造方法に使用するための金型構造（本発明
２）が提供される。[Structure of the Invention] According to the present invention, after the first resin material is injection molded into the cavity A formed by clamping the molds with at least one pair of fixed/or movable molds and another movable mold, the molds are not opened. In the method for manufacturing a double injection molded product, in which a second resin material is injected into a cavity B formed by moving at least one pair of small movable molds forming a part of both molds, the first resin material is injected. When the second resin material is injected, the cavity B is cut off from the cavity A, and when the second resin material is injected, the cavity B is partially communicated with the cavity A, so that the first resin material and the second resin material are joined. A method for producing a double injection molded product characterized by (present invention 1)
) and at least one pair of fixed molds/or movable molds and another movable mold arranged to form cavity A, and each fixed mold or movable mold communicates with cavity A while remaining stationary without opening the mold. Claim 1, characterized in that each of the small movable molds arranged to form the B is built-in.
A mold structure (present invention 2) for use in the manufacturing method described in section 2 is provided.
以下に実施例を用いて本発明の詳細な説明する。The present invention will be described in detail below using Examples.
第３図、第１図、第５図は夫々ＤＯＨＣガソリンエンジ
ンの合成樹脂製タイミングベルトカバーの左側面図、正
面図および右側面断面図である。FIG. 3, FIG. 1, and FIG. 5 are a left side view, a front view, and a right side sectional view, respectively, of a synthetic resin timing belt cover for a DOHC gasoline engine.
第３． ４． ５図において、１５０Ｓは硬質樹脂成形
部、３００Ｓは軟質樹脂成形部である。軟質樹脂成形部
３００８は硬質樹脂成形部１５０Ｓのに開口部にそのフ
ランジ部で融着接合されている。Third. 4. In FIG. 5, 150S is a hard resin molded part, and 300S is a soft resin molded part. The soft resin molded part 3008 is fusion-bonded to the opening of the hard resin molded part 150S at its flange.
第１−図、第２図は夫々本発明１，２の実施例１の断面
図である。Figures 1 and 2 are cross-sectional views of Embodiment 1 of the present inventions 1 and 2, respectively.
第１，２図において、１００は固定型、２００は可動型
、１５０はキャビティＡ、２１０は可動型２００が内蔵
する小移動型、２２０は固定型１００が内蔵する小移動
型、２１１，２１２，２２１．２２２は油圧室である。1 and 2, 100 is a fixed type, 200 is a movable type, 150 is a cavity A, 210 is a small movable type built in the movable type 200, 220 is a small movable type built in the fixed type 100, 211, 212, 221 and 222 are hydraulic chambers.
先ず第１図のように固定型（可動型であってもよい）１
００と可動型２００とが正確に位置決め並びに型締めさ
れる。その順序は先ず可動型２００が矢印りの方向に移
動して正確に固定型１００に接当し、次に小移動型２２
０が矢印Ｅの方向に移動する。First, as shown in Fig. 1, a fixed type (movable type may also be used) 1
00 and the movable mold 200 are accurately positioned and clamped. The order of this is that first the movable mold 200 moves in the direction of the arrow and accurately contacts the fixed mold 100, then the small movable mold 22
0 moves in the direction of arrow E.
この時、油圧が油圧室２１１．．２２１ ２２２に与え
られて小移動型２１０，２２０は右方（矢印Ｅの方向）
に移動し停止している。油圧室２２１は油圧室２２２に
よっても加圧されている。At this time, the hydraulic pressure is in the hydraulic chamber 211. ．． 221 and 222, and the small moving types 210 and 220 move to the right (in the direction of arrow E)
It moves and stops. The hydraulic chamber 221 is also pressurized by a hydraulic chamber 222.
そしてキャビティＡ１５０には第１樹脂材料が射出され
硬質樹脂成形体１５０Ｓが形成される。The first resin material is then injected into the cavity A150 to form a hard resin molded body 150S.
この時キャビティＡは小移動型２２０によって遮断され
キャビティＢと連通していない。At this time, the cavity A is blocked by the small movable mold 220 and does not communicate with the cavity B.
ついで油圧室２２２の油圧が下がり、逆に油圧室２］、
２，２２３，２２１に順に油圧が与えられるとキャビテ
ィＢがキャビティＡと連通ずる位置迄左方（矢印Ｆ方向
）に移動する。Then, the hydraulic pressure in the hydraulic chamber 222 decreases, and conversely, the hydraulic pressure in the hydraulic chamber 2],
When hydraulic pressure is sequentially applied to 2, 223, and 221, cavity B moves to the left (in the direction of arrow F) to a position where it communicates with cavity A.
そしてここで第２樹脂材料供給口（図示せず）より溶融
状態の第２樹脂材料が射出供給され、未だ温熱状態にあ
るキャビティＡ内の硬質樹脂成形体１５０Ｓに接合部１
６０で接合（融着）され軟質樹脂成形体３００Ｓが形成
される。Then, the second resin material in the molten state is injected and supplied from the second resin material supply port (not shown) to the hard resin molded body 150S in the cavity A, which is still in the heated state, at the joint 1.
They are joined (fused) at 60 to form a soft resin molded body 300S.
この時、小移動型２１０，２２０．２３０は固定型１０
０と可動型２００に共有内蔵されているが、最後の型開
きの時はキャビティＡ、 Ｂが第２図の状態から右方
（矢印Ｇ方向）（１００も可動型とする時は左右方向）
に分離分割され、完成した二重射出成形品（製品タイミ
ングベルトカバー）が取り出される。At this time, the small movable type 210, 220, 230 is fixed type 10
0 and movable mold 200, but when the mold is finally opened, cavities A and B are moved to the right (in the direction of arrow G) from the state shown in Fig. 2 (in the left and right direction when 100 is also movable).
The finished double injection molded product (product timing belt cover) is taken out.
本実施例では１一対の固定型１００と可動型２００を主
型としたが、製品形状によれば放射状（１−平面上）に
多数の可動型が集まってキャビティＡをつくるようにし
、更に直交する小移動型を設けてキャビティＢを形成す
るようにする事も出来る。In this embodiment, a pair of fixed molds 100 and a movable mold 200 are used as the main molds, but according to the product shape, a large number of movable molds are gathered radially (on the 1-plane) to create cavity A, and It is also possible to form the cavity B by providing a small movable mold.
［実施例２］第６図、第７図は実施例２の断面図である。[Example 2]FIGS. 6 and 7 are cross-sectional views of the second embodiment.
第６．７図において、同様に１００は固定型、２００は
可動型であり、１５０は固定型１００と可動型２００の
当接によって形成されるキャビティＡである。なお、固
定型１００、可動型２００は夫々予め小移動型２２０及
び２１０を内蔵している。In FIG. 6.7, 100 is a fixed mold, 200 is a movable mold, and 150 is a cavity A formed by the contact between the fixed mold 100 and the movable mold 200. Note that the fixed mold 100 and the movable mold 200 have small movable molds 220 and 210 built-in in advance, respectively.
最初第６図のように分離していた可動型２００が矢印り
の方向に移動して正確に型合せされ型締めされる。そし
てキャビティＡが形成され、第１樹脂材料がここに射出
され、硬質樹脂成形体１５０Ｓが成形される。The movable molds 200, which were initially separated as shown in FIG. 6, are moved in the direction of the arrow to be accurately aligned and clamped. Then, a cavity A is formed, the first resin material is injected into the cavity A, and a hard resin molded body 150S is molded.
なおこの時油圧室２１２に油圧が供給され、小移動型２
２０と２１０は左下方向（矢印Ｈ方向）に移動し停止し
ているのでキャビティＡと同Ｂは連通していない。At this time, hydraulic pressure is supplied to the hydraulic chamber 212, and the small moving type 2
Since cavities 20 and 210 move toward the lower left (in the direction of arrow H) and stop, cavities A and B do not communicate with each other.
次にキャビティＡを開かないまま、小移動型２２０．２
１０は油圧室２２２に油圧が付与される事によって右上
（矢印１方向）に移動し停止する。Next, without opening cavity A, small moving type 220.2
10 moves to the upper right (in the direction of arrow 1) and stops when hydraulic pressure is applied to the hydraulic chamber 222.
この結果キャビティＡとキャビティＢは接合（予定）部
１６０で連通ずる。As a result, the cavities A and B communicate with each other at the joint (planned) portion 160.
この時硬質樹脂成形体１５０３はまだ温熱状態にあり収
縮（ヒケ）は生じていない。At this time, the hard resin molded body 1503 is still in a heated state and no shrinkage (sink mark) has occurred.
そして間髪を入れずキャビティＢに樹脂射出口（図示せ
ず）より第２樹脂材料が射出される。Then, the second resin material is immediately injected into the cavity B from the resin injection port (not shown).
その結果、硬質樹脂成形体１５０Ｓと軟質樹脂成形体３
００３とは接合部１６０で強力に接合０（融着）される。As a result, a hard resin molded body 150S and a soft resin molded body 3
003 is strongly bonded (fused) at the bonding portion 160.
そして最後に可動型が右上（矢印Ｇ方向）に移動して製
品マッドフラップが取り出され次のサイクルに移行する
。Finally, the movable mold moves to the upper right (in the direction of arrow G), the product mud flap is taken out, and the process moves to the next cycle.
なお、金型構造としては前述の様に固定型１００も可動
型としてもよいし、矢印り、 Ｇ方向も上下（鉛直）、
左右（水平）方向であってもよい。As for the mold structure, as mentioned above, the fixed mold 100 may be a movable mold, and the arrow direction and G direction may also be vertical (vertical).
It may be in the left and right (horizontal) direction.
またり、 Ｇ方向が水平面上にあってＨ，Ｉ方向が鉛
直方向としてもよい。Alternatively, the G direction may be on a horizontal plane and the H and I directions may be vertical directions.
［実施例３］第８図、第９図は実施例３の平面もしくは側面断面図で
ある。[Example 3] FIGS. 8 and 9 are plan or side sectional views of Example 3.
１００は固定型、２００は可動型であって夫々小移動型
２２０．２１０を内蔵するのは他の実施例２と同様であ
るが、夫々が筒状小移動型２３０゜２３１を介在させて
いる処が異なる。寧ろ実施例１の筒状小移動型２３０を
可動型２００にも同２３１として設けたものと思えばよ
い。100 is a fixed type, and 200 is a movable type, each of which has built-in small movable types 220 and 210, as in the other embodiment 2, but each has a cylindrical small movable type 230° and 231 interposed therebetween. The location is different. Rather, it can be considered that the cylindrical small movable mold 230 of the first embodiment is also provided as the same 231 in the movable mold 200.
ここでも先ず可動型２００は左方（矢印り方向）に移動
して固定型に正確に型合わせされ、型締め１される。しかる後油圧室２２２に油圧が与えられ小移動
型２１０，２２０は右方（矢印Ｅ方向）に移動し停止す
る。従ってこの時キャビティＡはキャビティＢと連通箇
所を有しない。まだこの時は油圧室２２２，２１４に油
圧が与えられ筒状型２３０．２３１は中央寄りに移動し
停止する。In this case as well, the movable mold 200 is first moved to the left (in the direction of the arrow), is accurately matched with the fixed mold, and is clamped 1. Thereafter, hydraulic pressure is applied to the hydraulic chamber 222, and the small movable molds 210, 220 move to the right (in the direction of arrow E) and stop. Therefore, at this time, cavity A does not have a communicating portion with cavity B. At this time, hydraulic pressure is applied to the hydraulic chambers 222 and 214, and the cylindrical molds 230 and 231 move toward the center and stop.
その状態で第１樹脂材料がキャビティＡに射出され、硬
質樹脂成形品１５０８が成形される。In this state, the first resin material is injected into the cavity A, and a hard resin molded product 1508 is molded.
そして成形品１５０Ｓがまだ温熱状態にある間に素早く
次のようにしてキャビティＢが形成され、第２樹脂材料
が射出される。Then, while the molded product 150S is still in a heated state, the cavity B is quickly formed in the following manner, and the second resin material is injected.
すなわち、油圧室２１２に油圧が与えられ、小移動型２
２０，２１０は共に左方（矢印Ｆ方向）に移動し停止す
る。同時に油圧室２２３，２１３にも油圧が与えられ筒
状型２３０，２３１は左右に別れキャビティＢが形成さ
れる。That is, hydraulic pressure is applied to the hydraulic chamber 212, and the small moving type 2
20 and 210 both move leftward (in the direction of arrow F) and stop. At the same time, hydraulic pressure is applied to the hydraulic chambers 223 and 213, and the cylindrical molds 230 and 231 are separated into left and right sides to form a cavity B.
そこでキャビティＢに射出された軟質樹脂成形品３００
Ｓはまだ温熱状態にある硬質樹脂成形品１５０Ｓの端面
を接合部として包み込むように融着接合される。There, a soft resin molded product 300 was injected into cavity B.
S is fusion-bonded so as to wrap around the end face of the hard resin molded product 150S, which is still in a heated state, as a joint.
２しかる後可動型２００は右方（矢印Ｇ方向）に移動して
型開きされ、製品ワイヤハーネスプロテクタが取り出さ
れる。2. After that, the movable mold 200 is moved to the right (in the direction of arrow G) and opened, and the product wire harness protector is taken out.
以上実施例１． ２． ３において本発明１，２を詳細
に説明して来たが、第１樹脂材料は硬質樹脂、第２樹脂
材料は軟質樹脂とすれば、夫々タルク、ガラス繊維等の
無機質を含むポリプロピレン等のオレフィン系樹脂組成
物及びプロピレンラバーまたはエチレン、プロピレン、
ジェンターポリマーとポリプロピレン及び低分子量添加
剤等のブレンド組成物であるオレフィン系エラストマー
が好適に使用される。Above is Example 1. 2. Inventions 1 and 2 have been explained in detail in Section 3, but if the first resin material is a hard resin and the second resin material is a soft resin, olefins such as polypropylene containing inorganic materials such as talc and glass fiber, respectively. based resin composition and propylene rubber or ethylene, propylene,
Olefinic elastomers, which are blend compositions of genter polymers, polypropylene, low molecular weight additives, etc., are preferably used.
しかし前述のとおり、本発明における第１樹脂材料と第
２樹脂材料は互いに融着特性を有していれば何でもよく
、必ずしも硬質、軟質に制限されるものではない。二重
射出成形品の他の例としては色違い合成樹脂の組合せ、
硬質、軟質樹脂の逆転等各種のものが考えられるが、す
べて本発明の対象となるものである。However, as described above, the first resin material and the second resin material in the present invention may be any material as long as they have fusion properties with each other, and are not necessarily limited to being hard or soft. Other examples of double injection molded products include combinations of different colored synthetic resins,
Various types such as reversal of hard and soft resins can be considered, but all of them are subject to the present invention.
［発明の効果］本発明を実施する事により前記目的のすべてが達成され
る。[Effects of the Invention] By implementing the present invention, all of the above objects are achieved.
すなわち、第１樹脂材料が密閉型中にあって冷却硬化せ
ず、機械的にも拘束されて収縮（ヒケ）、反りが生じな
い間に第２樹脂材料を連通ずるキャビティＢに射出接合
するので、外観が美しく、接合性と機能性に優れた二重
射出成形品が得られるという産業上極めて有利な効果が
もたらされる。In other words, the second resin material is injected into the communicating cavity B while the first resin material is in the closed mold and does not cool and harden, is mechanically restrained, and does not shrink (sink) or warp. , a double injection molded product with a beautiful appearance and excellent bondability and functionality can be obtained, which is extremely advantageous in industry.
第１図、第２図は本発明実施例の断面図、第３゜４．５
図は夫々製品実施例の左側面図、正面図、右側面断面図
であり、第６． ７． ８． ９図はいづれも他の本発
明実施例の断面図である。１００ 固定型、２００ 可動型、１５０ キャビティＡ１３００
キャビティＢ１１５０Ｓ 硬質
樹脂成形品、３００Ｓ 軟質樹脂成形品、１
６０２１−０２３０゜２１１゜２２１゜２０３１２１２゜２２接合部、小移動型、筒状小移動型、２１４゜２２３ 油圧室。−５手続補正書（自発）１゜事件の表示平成２年特許願第２４８５３号２゜発明の名称Figures 1 and 2 are cross-sectional views of embodiments of the present invention;
The figures are a left side view, a front view, and a right side sectional view of the product example, respectively. 7. 8. 9 are sectional views of other embodiments of the present invention. 100 Fixed type, 200 Movable type, 150 Cavity A1300
Cavity B1150S hard resin molded product, 300S soft resin molded product, 1
60 21-0 230°211°221°20 31 212°22 Joint, small movement type, cylindrical small movement type, 214°223 Hydraulic chamber. -5 Procedural amendment (voluntary) 1゜Indication of the case 1990 Patent Application No. 24853 2゜Title of the invention
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2024853AJP2604870B2 (en) | 1990-02-02 | 1990-02-02 | Method for manufacturing double injection molded article and mold structure therefor |
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2024853AJP2604870B2 (en) | 1990-02-02 | 1990-02-02 | Method for manufacturing double injection molded article and mold structure therefor |
| Publication Number | Publication Date |
|---|---|
| JPH03230925Atrue JPH03230925A (en) | 1991-10-14 |
| JP2604870B2 JP2604870B2 (en) | 1997-04-30 |
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2024853AExpired - Fee RelatedJP2604870B2 (en) | 1990-02-02 | 1990-02-02 | Method for manufacturing double injection molded article and mold structure therefor |
| Country | Link |
|---|---|
| JP (1) | JP2604870B2 (en) |
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5762969A (en)* | 1996-08-01 | 1998-06-09 | Nelson Metal Products Corporation | Apparatus for casting an article in multiple portions |
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01135616A (en)* | 1987-11-24 | 1989-05-29 | Koito Mfg Co Ltd | Method and mold for integrally molding different lenses |
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01135616A (en)* | 1987-11-24 | 1989-05-29 | Koito Mfg Co Ltd | Method and mold for integrally molding different lenses |
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5762969A (en)* | 1996-08-01 | 1998-06-09 | Nelson Metal Products Corporation | Apparatus for casting an article in multiple portions |
| US5922264A (en)* | 1996-08-01 | 1999-07-13 | Nelson Metal Products Corporation | Method for casting an article in multiple portions |
| Publication number | Publication date |
|---|---|
| JP2604870B2 (en) | 1997-04-30 |
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|---|---|---|
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| JPH0346292B2 (en) |
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