JPH03173623A - Method and device for injection compression molding in three piece mold - Google Patents
Method and device for injection compression molding in three piece moldInfo
- Publication number
- JPH03173623A JPH03173623A JP31336689A JP31336689A JPH03173623A JP H03173623 A JPH03173623 A JP H03173623A JP 31336689 A JP31336689 A JP 31336689A JP 31336689 A JP31336689 A JP 31336689A JP H03173623 A JPH03173623 A JP H03173623A
- Authority
- JP
- Japan
- Prior art keywords
- mold
- fixed side
- runner
- plate
- section
- 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
- 238000000748 compression moulding Methods 0.000 title claims description 22
- 238000002347 injection Methods 0.000 title claims description 19
- 239000007924 injection Substances 0.000 title claims description 19
- 238000000034 method Methods 0.000 title claims description 19
- 125000006850 spacer group Chemical group 0.000 claims abstract description 25
- 230000006835 compression Effects 0.000 claims abstract description 11
- 238000007906 compression Methods 0.000 claims abstract description 11
- 238000000465 moulding Methods 0.000 claims description 5
- 239000011347 resin Substances 0.000 abstract description 18
- 229920005989 resin Polymers 0.000 abstract description 18
- 238000001816 cooling Methods 0.000 abstract description 2
- 238000007789 sealing Methods 0.000 abstract description 2
- 230000000717 retained effect Effects 0.000 abstract 1
- 230000000694 effects Effects 0.000 description 3
- 238000003825 pressing Methods 0.000 description 3
- 238000004049 embossing Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- 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
- B29C45/46—Means for plasticising or homogenising the moulding material or forcing it into the mould
- B29C45/56—Means for plasticising or homogenising the moulding material or forcing it into the mould using mould parts movable during or after injection, e.g. injection-compression moulding
- B29C45/561—Injection-compression moulding
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- 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
- B29C45/46—Means for plasticising or homogenising the moulding material or forcing it into the mould
- B29C45/56—Means for plasticising or homogenising the moulding material or forcing it into the mould using mould parts movable during or after injection, e.g. injection-compression moulding
- B29C45/561—Injection-compression moulding
- B29C2045/5615—Compression stroke, e.g. length thereof
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、３枚金型における射出圧縮成形方法及びその
装置に関し、特に、型締時のランナ一部の樹脂洩れを防
止すると共に、キャビティ部の間隔を制御して圧縮量を
正確に制御可能とするための新規な改良に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an injection compression molding method and apparatus for a three-piece mold, and in particular, to prevent resin leakage from a part of a runner during mold clamping, and to prevent molding from a cavity. The present invention relates to a new improvement that enables accurate control of the amount of compression by controlling the spacing between the sections.
最近のプラスデック射出成形の中で、特に超精密成形技
術を必要とされている光ディスク及びプラスチックレン
ズ等の成形においては、射出圧縮成形法が用いられてお
り、その金型仕様としては、文献名等は開示していない
が、材料充填後に金型のコア部を作動させて圧縮する方
法と、キャビティ部をインロー仕様とし、予め金型を開
き、材料充填後に型締を行い圧縮する方法とがあり、こ
れらは何れも２枚金型構造が採用されていた。In recent Plus Deck injection molding, the injection compression molding method is used especially in the molding of optical discs and plastic lenses that require ultra-precision molding technology, and the mold specifications are as follows: Although not disclosed, there is a method in which the core part of the mold is operated and compressed after filling the material, and a method in which the cavity part has a spigot specification, the mold is opened in advance, and the mold is clamped and compressed after filling the material. Both of these had a two-mold structure.
従来の射出圧縮成形方法は、以上のように構成されてい
たため、次のような課題を有していた。Since the conventional injection compression molding method was configured as described above, it had the following problems.
ずなわち、従来の構造をピンポイントゲート３枚構造の
金型に応用して射出圧縮成形を試みた場き、ランナ一部
から溶融樹脂のはみ出しが発生し、また、ランナ一部を
インロー仕様とした場かには、キャビティ部の圧縮量を
正確に制御することが極めて困難てあった。In other words, when we tried injection compression molding by applying the conventional structure to a mold with a three-piece pinpoint gate structure, molten resin protruded from part of the runner, and part of the runner was designed with a spigot. In this case, it is extremely difficult to accurately control the amount of compression in the cavity.
本発明は、以」−のような課題を解決するなめになされ
たもので、特に、型締時のランナ一部の樹脂洩れを防止
すると共に、キャピテイ部の間隔を制御して圧縮量を正
確に制御り能とした３枚金型における射出圧縮成形方法
を提供することを目的とする。The present invention has been made to solve the following problems, and in particular, it prevents resin leakage from a part of the runner during mold clamping, and also controls the interval between capitage parts to accurately control the amount of compression. The purpose of the present invention is to provide an injection compression molding method using a three-piece mold that is highly controllable.
本発明による３枚金型におりる射出圧縮成形方法は、可
動金型と固定側型板間に出入自在に設けられたスペーサ
を介して前記固定側型板をランナス１ヘリツバ−板と共
に固定側取付板に型締する１″とにより、前記ランナス
Ｉ・リッパ−板と固定側型板の締付けを得ると共に、そ
の後、前記スペーサの突出量に応じて前記固定側型板と
可動金型間に形成されるキャビティ部の圧縮量を任意に
制御するようにした方法である。In the injection compression molding method using a three-piece mold according to the present invention, the fixed side mold plate is inserted into the fixed side mold together with the runner 1 helical plate through a spacer provided between the movable mold and the fixed side mold plate so as to be freely removable. By clamping the mold to the mounting plate, the runner I/ripper plate and the fixed mold plate are tightened, and then, depending on the amount of protrusion of the spacer, the space between the fixed mold plate and the movable mold is This is a method in which the amount of compression of the cavity to be formed is arbitrarily controlled.
また、他の発明である３枚金型における射出圧縮成形装
置は、固定側型板をランナストリッパー板を介して設け
るための固定側取付板と、前記固定側型板の型凹部内に
位置する型押部を有し往復動できるように前記固定側型
板に対向配設された可動金型と、前記型凹部と前記型押
部との間に形成され前記固定側取付板及び固定側型板を
貫通して注入される溶融樹脂を圧縮成形するためのキャ
ビティ部と、前記可動金型に設けられ前記可動金型と前
記固定側型板間において出入自在に設けられたスペーサ
とを備えた構成である。In addition, an injection compression molding apparatus for a three-piece mold according to another invention includes a fixed-side mounting plate for installing a fixed-side mold plate via a runner stripper plate, and a fixed-side mounting plate located in a mold recess of the fixed-side mold plate. a movable mold having an embossing portion and disposed opposite to the fixed side mold plate so as to be able to reciprocate; and a movable mold formed between the mold recess and the embossing portion and the fixed side mounting plate and the fixed side mold. A cavity portion for compression molding the molten resin injected through the plate, and a spacer provided in the movable mold so as to be movable in and out between the movable mold and the fixed mold plate. It is the composition.
本発明による３枚金型における射出圧縮成形方法及びそ
の装置においては、可動金型と固定側型板との間にスペ
ーサが出入自在に設けられているなめ、このスペーサを
可動金型と固定側型板との間に突出させてキャビティ部
の間隔をある程度保った状態で可動金型を押入して型締
を行うと、固定側型板とランナストリッパー板が固定側
取付板側に押圧されるため、ランナ一部の洩れが完全に
防止できる。 さらに、その後、前記スペーサの突出量
を調節することにより、キャビティ部の間隔を任意に変
えることができ、所定の間隔とした状態て可動金型を押
圧することにより、キャビティ部内の樹脂を所定の圧縮
量で圧縮することができる。In the method and apparatus for injection compression molding using a three-piece mold according to the present invention, a spacer is provided between the movable mold and the stationary mold plate so that the spacer can move in and out. When the movable mold is pushed in and clamped with the cavity protruding between it and the mold plate to maintain a certain distance, the fixed mold plate and runner stripper plate are pressed against the fixed side mounting plate. Therefore, leakage in a part of the runner can be completely prevented. Furthermore, by adjusting the amount of protrusion of the spacer, the interval between the cavities can be arbitrarily changed, and by pressing the movable mold with a predetermined interval, the resin in the cavity can be adjusted to a predetermined value. It can be compressed by the amount of compression.
従って、このスペーサの突出量によってキャビティ部の
間隔を任意に変え、内部の圧縮量を任意の値に保持して
圧縮成形することができる。Therefore, the distance between the cavity parts can be arbitrarily changed depending on the amount of protrusion of this spacer, and compression molding can be performed while maintaining the amount of internal compression at an arbitrary value.
以下、図面と共に本発明による３枚金型における射出圧
縮成形方法及びその装置の好適な実施例について詳細に
説明する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the injection compression molding method using a three-mold mold and its apparatus according to the present invention will be described below in detail with reference to the drawings.
第１図及び第２図は、本発明による３枚金型における射
出圧縮成形方法及びその装置を示ずための断面図及び制
御説明図である。FIG. 1 and FIG. 2 are a sectional view and a control explanatory view showing the injection compression molding method and apparatus using a three-mold mold according to the present invention.
図において符号１で示されるものは、固定配設された固
定側取付板であり、この固定側取付板１には、ランナス
トリッパー板２及び固定側型板３が互いに接芹して設け
られている。What is indicated by the reference numeral 1 in the figure is a fixed side mounting plate that is fixedly arranged, and a runner stripper plate 2 and a fixed side template plate 3 are provided on this fixed side mounting plate 1 in abutment with each other. There is.
前記固定側底１寸板１には、ゲート部１ａが形成されて
おり、前記固定側型板３とランナストリッパー板２との
間には、前記ゲート部１ａに連通するランナ一部２ａが
形成されている。A gate portion 1a is formed on the fixed side bottom one-dimensional plate 1, and a runner portion 2a communicating with the gate portion 1a is formed between the fixed side mold plate 3 and the runner stripper plate 2. has been done.
前記固定側型板３の中央位置に形成された型凹部３ａ内
には、図示しない移動部材によって矢印Ａ、Ｂの方向に
往復動できるように構成された可動金型４の押型部４ａ
が出入自在に配設されており、この押型部４ａの周面に
形成された押型凹部４ａＡと前記型凹部３ａとの間には
、樹脂を圧縮成形するためのキャビティ部５が形成され
ている。In the mold recess 3a formed at the center of the stationary mold plate 3, there is a pressing mold part 4a of a movable mold 4 configured to be able to reciprocate in the directions of arrows A and B by a moving member (not shown).
is arranged to be able to come in and out freely, and a cavity 5 for compression molding the resin is formed between the mold recess 4aA formed on the circumferential surface of the mold part 4a and the mold recess 3a. .
前記キャビティ部５は、前記ランナ一部２ａと連通して
おり、前記ゲート部１ａから注入された溶融樹脂は、こ
のランナ一部２ａを経て前記キャビティ部５に案内され
る構成で、ピンポイントゲート３枚金型を構成している
。The cavity part 5 communicates with the runner part 2a, and the molten resin injected from the gate part 1a is guided to the cavity part 5 through the runner part 2a, so that the pinpoint gate It consists of three molds.
前記可動金型４の外端位置には、取付ボルト６及び連結
板７を介して配設された一対の油圧シリンダ８が固定さ
れており、この油圧シリンダ８のロッド８ａの先端には
、テーパ部９ａを有するスペーサ９が一体状に取付けら
れている。A pair of hydraulic cylinders 8 are fixed to the outer end of the movable mold 4 via mounting bolts 6 and connecting plates 7, and a rod 8a of the hydraulic cylinders 8 has a tapered end. A spacer 9 having a portion 9a is integrally attached.
前記スペーサ９には、ストローク調整ボルト１０を有す
る保持板１１が設けられており、このストローク調整ボ
ルト１０を回転することによって、その先端１０ａの突
出量が変えられるように構成され、この先端１０ａが前
記可動金型４の段部４ｂに当接することにより、前記ロ
ッド８ａ及びスペーサ９の突出量が規制されるように構
成されている。The spacer 9 is provided with a holding plate 11 having a stroke adjustment bolt 10, and by rotating the stroke adjustment bolt 10, the amount of protrusion of its tip 10a can be changed. By coming into contact with the stepped portion 4b of the movable mold 4, the amount of protrusion of the rod 8a and the spacer 9 is regulated.
さらに、前記固定側型板３の端部に形成された固定テー
パ部３ｂは、前記スペーサ９のテーパ部９ａと対応して
設けられており、前記可動金型４を矢印Ａの方向に押圧
すると、テーパ部９ａが固定テーパ部３ｂに当接するよ
うに構成されている。Furthermore, the fixed tapered part 3b formed at the end of the fixed side mold plate 3 is provided corresponding to the tapered part 9a of the spacer 9, and when the movable mold 4 is pressed in the direction of arrow A, , the tapered portion 9a is configured to abut against the fixed tapered portion 3b.
本発明による３枚金型における射出圧縮成形方法及びそ
の装置に用いる射出圧縮機は前述したように構成されて
おり、以下に、その方法及び装置について説明する。The injection compression molding method using a three-mold mold according to the present invention and the injection compressor used in the apparatus are constructed as described above, and the method and apparatus will be explained below.
まず、各油圧シリンダ８に油圧を供給して各ロッド８ａ
を突出させると、各スペーサ９が可動金型４と固定側型
板３間において前進するため、キャビティ部５の間隔り
は所要量を確保することができる。First, hydraulic pressure is supplied to each hydraulic cylinder 8, and each rod 8a is
When protruded, each spacer 9 moves forward between the movable mold 4 and the fixed mold plate 3, so that the required distance between the cavity parts 5 can be secured.
７
この状態で、可動金型４を矢印Ａの方向に押圧すると、
テーパ部９ａが固定テーパ部３ｂに当接するため、キャ
ビティ部５の間隔りは変化せずに、固定側型板３とラン
ナストリッパー板２が固定側取付板１に対して押圧され
、型締状態となるため、ランナ一部２ａは密状態に保持
される。7 In this state, when the movable mold 4 is pressed in the direction of arrow A,
Since the tapered part 9a contacts the fixed tapered part 3b, the interval between the cavity parts 5 does not change, and the fixed side mold plate 3 and the runner stripper plate 2 are pressed against the fixed side mounting plate 1, and the mold is in a clamped state. Therefore, the runner portion 2a is maintained in a dense state.
前述の状態で、図示しない射出シリンダから溶融樹脂を
ゲート部１’ ａに注入すると、溶融樹脂はランナ一部
２ａを介してキャビティ部５内に注入されるが、この場
合、ランナ一部２ａは前述したように密状態に保持され
ているため、ランナ一部２ａからの樹脂洩れは完全に防
止されている。When molten resin is injected into the gate part 1'a from an injection cylinder (not shown) in the above-mentioned state, the molten resin is injected into the cavity part 5 through the runner part 2a, but in this case, the runner part 2a is As described above, since the runner part 2a is kept tightly sealed, resin leakage from the runner part 2a is completely prevented.
次に、前述の状態で、ゲート部１ａの溶融樹脂が冷却し
、ゲートシールが終了した段階において、各油圧シリン
ダ８を作動させて各スペーサ９を後退させ、可動金型４
を矢印Ａの方向に多段階的に押圧させると、間隔りは前
述の状態よりも小さくなるため、キャビティ部５内の樹
脂は、多段階的に押圧されて型締圧縮され、冷却が完了
すると所定形状の圧縮成形品を得ることができる。Next, in the above-mentioned state, when the molten resin in the gate part 1a has cooled and the gate sealing has been completed, each hydraulic cylinder 8 is operated to retreat each spacer 9, and the movable mold 4
When pressed in multiple steps in the direction of arrow A, the gap becomes smaller than in the above-mentioned state, so the resin in the cavity 5 is pressed in multiple steps and is compressed by mold clamping, and when cooling is completed. A compression molded product having a predetermined shape can be obtained.
前述の圧縮成形工程は、その状態を図示すると、第２図
のようになり、スペーサ９の前進及び後退によって、ラ
ンナ一部２ａの型締及びキャビティ部５の型締が行われ
る状態が明らかにされている。The state of the compression molding process described above is shown in FIG. 2, and it is clear that the runner part 2a and the cavity part 5 are clamped by advancing and retracting the spacer 9. has been done.
尚、前述の油圧シリンダ８は、本実施例の油圧構成に限
らず、空気圧でもよく、また、ボールねじとナツトの組
合わせによるモータを用いた電動構成とした場合も、前
述と同等の作用効果が得られることは述べるまでもない
ことである。Note that the above-mentioned hydraulic cylinder 8 is not limited to the hydraulic structure of this embodiment, but may also be a pneumatic structure, and even if it is an electric structure using a motor formed by a combination of a ball screw and a nut, the same operation and effect as described above can be obtained. It goes without saying that this can be obtained.
本発明による３枚型における射出圧縮成形方法及びその
装置は、以上のように構成されているため、次のような
効果を得ることができる。Since the three-piece mold injection compression molding method and apparatus according to the present invention are configured as described above, the following effects can be obtained.
すなわち、可動金型と固定側型板との間にスペーサが出
入自在に設けられているため、このスペーサを可動金型
と固定側型板との間に突出させてキャビティ部の間隔を
ある程度保った状態で可動金型を押入して型締を行うと
、固定側型板とランナストリッパー板が固定側取付板側
に押圧されるため、ランナ一部の洩れが完全に防止でき
る。In other words, since the spacer is provided between the movable mold and the fixed mold plate so that it can move in and out, this spacer is made to protrude between the movable mold and the fixed mold plate to maintain a certain distance between the cavity parts. When the movable mold is pushed into the movable mold and the mold is clamped, the fixed side mold plate and the runner stripper plate are pressed against the fixed side mounting plate, so that leakage of a part of the runner can be completely prevented.
さらに、その後、前記スペーサの突出量を調節すること
により、キャビティ部の間隔を任意に変えることができ
、所定の間隔とした状態で可動金型を押圧することによ
り、キャビティ部内の樹脂を所定の圧縮量で圧縮するこ
とができる。Furthermore, by adjusting the protrusion amount of the spacer, the interval between the cavities can be changed arbitrarily, and by pressing the movable mold with the predetermined interval, the resin in the cavity can be adjusted to a predetermined value. It can be compressed by the amount of compression.
第１図及び第２図は、本発明による３枚金型における射
出圧縮成形方法及びその装置を示すための断面図及び制
御説明図である。
１は固定側底（−１板、２はランナストリッパー板、３
は固定側型板、４は可動金型、５はキャビティ部、９は
スペーサである。FIG. 1 and FIG. 2 are a sectional view and a control explanatory diagram showing the injection compression molding method and apparatus using a three-mold mold according to the present invention. 1 is the fixed side bottom (-1 plate, 2 is the runner stripper plate, 3
4 is a fixed mold plate, 4 is a movable mold, 5 is a cavity portion, and 9 is a spacer.
Claims (2)
を行うようにした３枚金型における射出圧縮成形方法に
おいて、 可動金型（４）と固定側型板（３）間に出入自在に設け
られたスペーサ（９）を介して前記固定側型板（３）を
ランナストリッパー板（２）と共に固定側取付板（１）
に型締することにより、前記ランナストリッパー板（２
）と固定側型板（３）の締付を得ると共に、その後、前
記スペーサ（９）の突出量に応じて前記固定側型板（３
）と可動金型（４）間に形成されるキャビティ部（５）
の圧縮量を制御するようにしたことを特徴とする３枚金
型における射出圧縮成形方法。(1) In an injection compression molding method using a three-piece mold for compression molding using a pinpoint gate three-piece mold, the movable mold (4) and the stationary mold plate (3) can be freely moved in and out. The fixed side mold plate (3) is attached to the fixed side mounting plate (1) together with the runner stripper plate (2) via a spacer (9) provided in the
By clamping the mold, the runner stripper plate (2
) and the fixed side template (3), and then tighten the fixed side template (3) according to the amount of protrusion of the spacer (9).
) and the cavity part (5) formed between the movable mold (4)
An injection compression molding method using a three-piece mold, characterized in that the amount of compression is controlled.
）を介して設けるための固定側取付板（１）と、前記固
定側型板（３）の型凹部（３ａ）内に位置する型押部（
４ａ）を有し往復動できるように前記固定側型板（３）
に対向配設された可動金型（４）と、前記型凹部（３ａ
）と前記型押部（４ａ）との間に形成され前記固定側取
付板（１）及び固定側型板（３）を貫通して注入される
溶融樹脂を圧縮成形するためのキャビティ部（５）と、
前記可動金型（４）に設けられ前記可動金型（４）と前
記固定側型板（３）間において出入自在に設けられたス
ペーサ（９）とを備え、前記スペーサ（９）の出入状態
に応じて、前記固定側型板（３）及びランナストリッパ
ー板（２）の前記固定側取付板（１）への型締、並びに
、前記キャビティ部（５）の圧縮量を制御できるように
構成したことを特徴とする３枚金型における射出圧縮成
形装置。(2), the fixed side template (3) is attached to the runner stripper plate (2).
) and a molding part (1) located in the mold recess (3a) of the fixed mold plate (3).
4a) and the fixed side mold plate (3) so as to be able to reciprocate.
The movable mold (4) is disposed opposite to the movable mold (4), and the mold recess (3a
) and the molding part (4a), the cavity part (5 )and,
A spacer (9) provided on the movable mold (4) and movable in and out between the movable mold (4) and the stationary mold plate (3), and the spacer (9) can be moved in and out. According to An injection compression molding device using a three-mold mold, which is characterized by:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP31336689A JPH0667580B2 (en) | 1989-12-04 | 1989-12-04 | Injection compression molding method and apparatus for three-die mold |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP31336689A JPH0667580B2 (en) | 1989-12-04 | 1989-12-04 | Injection compression molding method and apparatus for three-die mold |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH03173623A true JPH03173623A (en) | 1991-07-26 |
| JPH0667580B2 JPH0667580B2 (en) | 1994-08-31 |
Family
ID=18040394
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP31336689A Expired - Fee Related JPH0667580B2 (en) | 1989-12-04 | 1989-12-04 | Injection compression molding method and apparatus for three-die mold |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0667580B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05131510A (en) * | 1991-11-12 | 1993-05-28 | Toyoda Gosei Co Ltd | Resin molding method and molding die |
-
1989
- 1989-12-04 JP JP31336689A patent/JPH0667580B2/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05131510A (en) * | 1991-11-12 | 1993-05-28 | Toyoda Gosei Co Ltd | Resin molding method and molding die |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0667580B2 (en) | 1994-08-31 |
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| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |