JPS6322620A - Method and apparatus for injection molding of molding having recessed part on its surface - Google Patents
Method and apparatus for injection molding of molding having recessed part on its surfaceInfo
- Publication number
- JPS6322620A JPS6322620A JP16754586A JP16754586A JPS6322620A JP S6322620 A JPS6322620 A JP S6322620A JP 16754586 A JP16754586 A JP 16754586A JP 16754586 A JP16754586 A JP 16754586A JP S6322620 A JPS6322620 A JP S6322620A
- Authority
- JP
- Japan
- Prior art keywords
- core
- injection
- mold
- die
- molding
- 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
- 238000001746 injection moulding Methods 0.000 title claims abstract description 16
- 238000000465 moulding Methods 0.000 title abstract description 12
- 238000000034 method Methods 0.000 title description 8
- 238000002347 injection Methods 0.000 claims abstract description 40
- 239000007924 injection Substances 0.000 claims abstract description 40
- 239000011347 resin Substances 0.000 claims abstract description 23
- 229920005989 resin Polymers 0.000 claims abstract description 23
- 239000010409 thin film Substances 0.000 claims abstract description 11
- 238000005452 bending Methods 0.000 abstract description 3
- 230000015572 biosynthetic process Effects 0.000 abstract description 2
- 239000010720 hydraulic oil Substances 0.000 abstract 4
- 239000010408 film Substances 0.000 description 15
- 239000012141 concentrate Substances 0.000 description 2
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
- B29C45/5675—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 for making orifices in or through the moulded article
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は、表面に凹部を有する成形品の射出成形方法及
び装置に関するものである。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method and apparatus for injection molding a molded article having a concave portion on its surface.
（従来の技術）
従来、射出成形品−１例えばカード等の板状物にあって
、その成形表面に凹部を設けたものは、しばしば利用さ
れるが、このような成形品の射出成形に当たっては、キ
ャビティとコアとから形成される射出成形型は、成形表
面の凹部の成形に必要な突部が、予めコア側の型面より
内方に突設されているものであった。(Prior art) Conventionally, injection molded products-1, for example, plate-shaped objects such as cards, with recesses provided on the molding surface are often used, but when injection molding such molded products, In an injection mold formed from a cavity and a core, a protrusion necessary for forming a recess on the molding surface is provided in advance to protrude inward from the mold surface on the core side.
（発明が解決しようとする問題点）
上記のような′従来の射出成形にあっては、射出成形型
内に、成形品の凹部を形成するため・の突部が予め突設
されているので、このような射出成形型内に溶融樹脂を
射出すると、射出樹脂は、型内において、型面側の表面
に薄い被膜を生ずるものであるが、この薄い被膜は、型
内の突部において両側に分かれた後、突部を越えて再び
一緒になる際、その合わせ目は、元のような−様な膜と
はならず、筋目状のウェルド部が形成され、成形型内の
空気は、この部分に残留する。(Problems to be Solved by the Invention) In conventional injection molding as described above, a protrusion for forming a recess in a molded product is provided in advance in the injection mold. When molten resin is injected into such an injection mold, the injected resin forms a thin film on the surface of the mold side inside the mold, but this thin film covers both sides of the protrusion inside the mold. After the two parts are separated, when they cross over the protrusion and come together again, the seam does not form the original -like film, but a line-like weld part is formed, and the air inside the mold is It remains in this part.
したがって、成形品にも、板面の凹部に続いて、筋目状
のウェルド部が残る。（第６図）このような成形品の板
面に筋目状のウェルド部が残ることは、例えば成形品の
板面に絵付きフィルムを埋め込むような場合において、
絵付きフィルムと成形樹脂間にあるウェルド部の残留空
気のため、絵付きフィルムは剥離するおそれがあった。Therefore, a line-like weld portion remains in the molded product following the recessed portion on the plate surface. (Fig. 6) The fact that such streak-like weld portions remain on the plate surface of a molded product is caused, for example, when a film with a picture is embedded in the plate surface of a molded product.
Due to residual air in the weld between the painted film and the molded resin, there was a risk that the painted film would peel off.
また筋目状のウェルド部のために曲げ強度の低下ととも
に、外観的な見栄もよいものではなかった。In addition, due to the weld portion having a lined pattern, the bending strength was reduced and the appearance was not good.
（問題点を解決するための手段）
本発明は、このような表面に凹部を有する成形品におい
て、この凹部に続いて生ずる筋目状のウェルド部を除去
するために、次のような射出成形方法及びその装置にて
問題点の解決を図っている。(Means for Solving the Problems) The present invention provides the following injection molding method in order to remove the line-like weld portions that occur following the recesses in molded products having such recesses on the surface. We are trying to solve the problems with this equipment.
すなわち、方法としては、キャビティとコアとで形成さ
れた射出成形型内に、溶融樹脂を射出して、その樹脂が
型面にそって流れ、薄い被膜を生じた後において、コア
側の型面と同一面にあったコア入子を成形型内に突出す
るとともに、射出を続けるというものであり、またこの
方法を実施するための装置としては、キャビティとコア
とで形成される溶融樹脂の射出成形型内に対し、コア側
の成形型の型面と同一面にあるコア入子を、成形型内に
突出自在に設けたものである。In other words, the method involves injecting molten resin into an injection mold formed by a cavity and a core, and after the resin flows along the mold surface and forms a thin film, the mold surface on the core side is injected. The core insert, which was on the same surface as the core, is projected into the mold and injection is continued.The equipment used to carry out this method is to inject the molten resin formed by the cavity and the core. A core insert is provided in the mold so that it can freely protrude into the mold, and the core insert is on the same surface as the mold surface of the mold on the core side.
（実施例）
以下、本発明の方法とそれを実施するための装置とを図
面について説明する。(Example) Hereinafter, the method of the present invention and the apparatus for implementing the same will be explained with reference to the drawings.
本発明は、第５図（イ）及び（ロ）に示すような板状体
の成形品（ｐ）及び（ｐ゛）において、その板面（１）
に凹部（２）が形成されているようなものを射出成形す
るための方法及び装置に関するものである。The present invention provides plate-like molded products (p) and (p゛) as shown in FIGS.
The present invention relates to a method and apparatus for injection molding a product having a recess (2) formed therein.
（３）は射出ゲートであり、（４）は絵付きフィルムで
ある。(3) is an injection gate, and (4) is a film with pictures.
第６図に示すものは、従来の装置によって射出成形され
た成形品（ｐ”）であって、板面（１”）の凹部（２゛
）に続いて射出ゲート（３’）側と反対側にウェルド部
（Ｗ）が形成されている。What is shown in Fig. 6 is a molded product (p'') injection molded using a conventional device, following the recess (2゛) on the plate surface (1'') and opposite to the injection gate (3') side. A weld portion (W) is formed on the side.
先ず装置について説明すると、この装置は射出成形機に
装着されるもので、キャビティ（ａ）とコア（ｂ）とに
よって射出成形型（Ｓ）が形成される。コア（ｂ）側に
は射出成形型（３）内に突出自在なコア入子（ｃ）が設
けられており、このコア入子（Ｃ）は、コア（ｂ）側に
付設された油圧装置（ｄ）の圧油室（５）内を油圧にて
摺動する鍔部（６）に連結されている。First, the apparatus will be described. This apparatus is installed in an injection molding machine, and an injection mold (S) is formed by a cavity (a) and a core (b). A core insert (c) that can freely protrude into the injection mold (3) is provided on the core (b) side, and this core insert (C) is connected to a hydraulic device attached to the core (b) side. It is connected to a collar (6) that slides hydraulically within the pressure oil chamber (5) in (d).
コア入子（ｃ）の端面（７）は、射出成形時に射出成形
型（Ｓ）のコア（ｂ）側の型面、（８）と一致するよう
な平面をなしており、コア入子（Ｃ）は、油圧装置（ｄ
）の圧油室（５）内において、鍔部（６）の左右に交互
に圧油が導入されることにより、引込んだり、突出した
りするようになっている。The end surface (7) of the core insert (c) has a flat surface that coincides with the mold surface (8) on the core (b) side of the injection mold (S) during injection molding. C) is a hydraulic system (d
) Inside the pressure oil chamber (5), pressure oil is alternately introduced to the left and right sides of the flange (6), thereby retracting or protruding.
また、コア（ｂ）には、キャビティ（ａ）に対しての接
合面に、溶融樹脂を射出成形型（ｓ）内に射出するため
のランナー（９）が穿設されている。Moreover, a runner (9) for injecting molten resin into the injection mold (s) is bored in the core (b) at the joint surface with respect to the cavity (a).
次に、本発明の装置を使用しての射出成形品（ｐ）及び
（ｐ゛）の成形方法について説明する。Next, a method of molding injection molded products (p) and (p') using the apparatus of the present invention will be explained.
■ 第１図に示すように、油圧装置（ｄ）の圧油室（５
）内の鍔部（６）の左側に圧油を導入して、コア入子（
Ｃ）をその端面（７）が、射出成形型（３）のコア（ｂ
）側の型面（８）と同一面になるように引込ませる。■ As shown in Figure 1, the pressure oil chamber (5) of the hydraulic system (d)
) Introduce pressure oil to the left side of the flange (6) inside the core insert (
C), whose end face (7) is the core (b) of the injection mold (3).
) side so that it is flush with the mold surface (8).
■ 溶融樹脂を、そのランナー（９）より射出成形型（
ｓ）内に射出する。このとき溶融樹脂は、成形型（ｓ）
の型面にそって流れ、その型面側の表面に薄い被膜を生
ずる。■ The molten resin is passed through the runner (9) into the injection mold (
s) inject into the interior. At this time, the molten resin is transferred to the mold (s)
It flows along the mold surface and forms a thin film on the mold surface side.
■ この薄い被膜が生じたところで、圧油室（５）の鍔
部（６）の右側に圧油を導入して、コア入子（Ｃ）を成
形型（ｓ）内に突出させ（第２図）、溶融樹脂の射出を
続ける。この場合、溶融樹脂は、表面の薄膜に影響を与
えることなく成形型（Ｓ）内に射出充填される。■ When this thin film is formed, pressure oil is introduced to the right side of the flange (6) of the pressure oil chamber (5), and the core insert (C) is made to protrude into the mold (s) (the second Figure), continue injection of molten resin. In this case, the molten resin is injected and filled into the mold (S) without affecting the thin film on the surface.
■ 射出成形が終わり一定時間後に、コア入子（Ｃ）を
その端面（７）が成形型（ｓ）の型面（８）に一致する
位置まで後退させるとともに、コア（ｂ）を油圧装置（
ｄ）と共にキャビティ （ａ）面より引き離して、射出
成形品（ｐ）を取出す。■ After a certain period of time after injection molding is finished, the core insert (C) is retracted to a position where its end surface (7) matches the mold surface (8) of the mold (s), and the core (b) is moved by a hydraulic device (
d) and pull it away from the cavity (a) side to take out the injection molded product (p).
この場合の射出成形品（ｐ）は、凹部（２）に続いて射
出ゲート（３）と反対側に筋目状のウェルド部を生ずる
ことはない。In this case, the injection molded product (p) does not have a line-like weld portion following the recess (2) on the side opposite to the injection gate (3).
第３図及び第４図は、第５図（ロ）に示すような、板面
一体化に凹部（２）と共に絵付きフィルム（４）を埋め
込んだ射出成形品（ｐｏ）を成形する場合の使用状態を
示すもので、油圧装置（ｄ）と一体のコア（ｂ）をキャ
ビティ （ａ）側に押接して成形型（Ｓ）を形成する前
に、コア（ｂ）側の型面（８）に予め絵付きフィルム（
４）を貼着しておき、その後の射出成形においては、前
記の第１図及び第２図の場合となんら変わるところはな
い。Figures 3 and 4 show the case of molding an injection molded product (po) in which the illustrated film (4) is embedded together with the recess (2) in the integrated plate surface, as shown in Figure 5 (b). This shows the state of use. Before pressing the core (b) integrated with the hydraulic system (d) against the cavity (a) side to form the mold (S), the mold surface (8) on the core (b) side is shown. ) with pre-painted film (
4) is pasted and the subsequent injection molding is no different from the case of FIGS. 1 and 2 described above.
この場合、成形型（Ｓ）の型面（８）に貼着した絵付き
フィルム（４）は薄いものであるから、溶融樹脂の射出
時においても、筋目状のウェルド部を形成する等のなん
らの影響を与えることはなく、成形型（ｓ）内の空気は
、成形型（Ｓ）の周囲に逃れるから、残留空気によって
絵付きフィルム（４）を剥離するようなおそれはない。In this case, since the painted film (4) attached to the mold surface (8) of the mold (S) is thin, there is no possibility that it will form a lined weld part or the like even during injection of the molten resin. Since the air inside the mold (s) escapes around the mold (S), there is no risk of the painted film (4) being peeled off by residual air.
これに対し、従来のように凹部（２°）を成形するため
の突部が、予め成形型（ｓ）内に突設されているもので
あるならば、射出成形樹脂の流れは、この突部において
両側に分かれるため、型面側の表面に形成された薄い被
膜は、その後流れが一緒になっても、ＩＢＭの合わせ目
は、−様な元の状態に戻らず、筋目状のウェルド部を形
成することから、この部分に成形型（ｓ）内の空気が集
中して残留し、貼着された絵付きフィルム（４）上をウ
ェルド部が通ることになるから、残留空気のため、成形
後において、埋め込まれた絵付きフィルム（４）は剥離
するおそれがある。On the other hand, if the protrusion for molding the recess (2°) is provided in advance in the mold (s) as in the past, the flow of the injection molding resin will Because the thin film formed on the surface of the mold side is divided into both sides at the part, even if the flows are combined afterwards, the IBM seam does not return to its original state like a -, and a line-like weld part is created. , the air in the mold (s) concentrates and remains in this part, and the weld part passes over the attached picture film (4), so due to the residual air, After molding, the embedded illustrated film (4) may peel off.
（発明の効果）
本発明は、表面に凹部を有する射出成形品の成形に当た
り、成形型内に溶融樹脂を射出し、その型面側の表面に
薄い被膜が形成された後において、この成形型内に、成
形品の凹部を成形するためのコア入子を突出させるだけ
で、その後の連続した射出においても、従来の射出成形
型内に突部のあるものに射出する時のように、突部によ
る筋目状のウェルド部を形成することな（、形成された
薄い被膜面に影響を与えることがないから、その表面が
滑らかで外観的の見栄もよく、しかも曲げに対しても強
い成形品を得ることができる。また、成形品面に絵付き
フィルムを埋め込むような場合にあっても、絵付きフィ
ルムと射出成形樹脂との間に、ウェルド部に集中する空
気の残留ということがないから、成形後において、この
絵付きフィルムが剥離するというおそれはない。(Effects of the Invention) When molding an injection molded product having a concave portion on the surface, the present invention injects molten resin into a mold, and after a thin film is formed on the surface of the mold, this mold By simply protruding the core insert for molding the concave part of the molded product, even in subsequent consecutive injections, there will be no protrusion, just like when injecting into a conventional injection mold with a protrusion. Since the formed thin film surface is not affected by the formation of weld parts, the surface is smooth and the appearance is good, and the molded product is resistant to bending. In addition, even when a painted film is embedded on the surface of a molded product, there is no residual air that concentrates in the weld area between the painted film and the injection molded resin. There is no fear that this painted film will peel off after molding.
このような成形品を成形するための装置は、キャビティ
とコアとで形成する射出成形型に対し、コア側より成形
品の凹部を形成するためのコア入子を突出自在に設ける
だけであるから、構成としては簡単であるが、前記した
方法にしたがって使用することにより、立派な射出成形
品を成形することができる。The device for molding such a molded product is simply provided with a core insert that can freely protrude from the core side to form the recess of the molded product in an injection mold formed by a cavity and a core. Although the structure is simple, by using the method described above, a fine injection molded product can be formed.
第１図、第２図及び第３図、第４図は２つの異なった射
出成形品を射出成形する状態を示す本発明の装置の断面
図、第５図（イ）及び（ロ）は、本発明の装置で射出成
形された上記の２つの異な９た射出成形品の斜視図、第
６図は従来の射出成形品の斜視図である。
符号ａ・・・・・・・・キャビティ
ｂ・・・・・・・・コ ア
Ｃ・・・・・・・・コア入子
ｄ・・・・・・・・油圧装置
ｐ、ｐ’、ｐ’・・射出成形品
Ｓ・・・・・・・・射出成形型
Ｗ・・・・・・・・ウェルド部
１・・・・・・・・板面
２・・・・・・・・凹部
３・・・・・・・・ゲート
４・・・・・・・・絵付きフィルム
５・・・・・・・・圧油室
６・・・・・・・・鍔部
７・・・・・・・・端面
８・・・・・・・・型面
９・・・・・・・・ランナー
（イＪ・
１口）
第５図
第６図
第１−図
第２図
第３図
第４図Figures 1, 2, 3 and 4 are cross-sectional views of the apparatus of the present invention showing injection molding of two different injection molded products, and Figures 5 (a) and (b) are FIG. 6 is a perspective view of the two different types of injection molded products described above that were injection molded using the apparatus of the present invention, and FIG. 6 is a perspective view of a conventional injection molded product. Code a...Cavity b...Core C...Core insert d...Hydraulic device p, p', p'... Injection molded product S... Injection mold W... Weld part 1... Plate surface 2... Recessed portion 3...Gate 4...Pictured film 5...Pressure oil chamber 6...Flame 7... ...End face 8...Mold surface 9...Runner (A J, 1 mouth) Fig. 5 Fig. 6 Fig. 1-Fig. 2 Fig. 3 Figure 4
Claims (2)
して、射出された溶融樹脂が型面側に薄い被膜を生じた
後において、コア側の型面と同一面にあったコア入子を
射出樹脂内に突出し、その後においても溶融樹脂の射出
を続けることを特徴とする表面に凹部を有する成形品の
射出成形方法(1) For an injection mold formed by a cavity and a core, after the injected molten resin has formed a thin film on the mold surface, the core insert is flush with the mold surface on the core side. An injection molding method for a molded product having a concave portion on its surface, characterized by protruding into the injection resin and continuing to inject the molten resin even after that.
成形型に対して、コア側の型面と同一面にあるコア入子
を突出自在に設けたことを特徴とする表面に凹部を有す
る成形品の射出成形装置(2) For a molten resin injection mold formed by a cavity and a core, the core insert is provided on the same surface as the mold surface on the core side and has a concave portion on the surface so as to be able to protrude freely. Injection molding equipment for molded products
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61167545A JPH0763983B2 (en) | 1986-07-16 | 1986-07-16 | Injection molding method and apparatus for molded article having concave portion on surface |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61167545A JPH0763983B2 (en) | 1986-07-16 | 1986-07-16 | Injection molding method and apparatus for molded article having concave portion on surface |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8205935A Division JP2779347B2 (en) | 1996-08-05 | 1996-08-05 | Injection molding method of molded article having concave part and pictured film on the surface |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6322620A true JPS6322620A (en) | 1988-01-30 |
| JPH0763983B2 JPH0763983B2 (en) | 1995-07-12 |
Family
ID=15851698
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61167545A Expired - Lifetime JPH0763983B2 (en) | 1986-07-16 | 1986-07-16 | Injection molding method and apparatus for molded article having concave portion on surface |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0763983B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0345321A (en) * | 1989-07-14 | 1991-02-26 | Toyo Seikan Kaisha Ltd | Molding method and its die for plug body for liquid transportation |
| WO1993024298A1 (en) * | 1992-06-02 | 1993-12-09 | Sumitomo Heavy Industries, Ltd. | Localized pressurizing type injection molding machine |
| US5405259A (en) * | 1991-06-18 | 1995-04-11 | Sumitomo Heavy Industries, Ltd. | Injection molding machine using a pulsating pressing force |
Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2578719A (en) * | 1944-06-14 | 1951-12-18 | Autograf Brush & Plastics Co I | Injection molding apparatus |
| JPS4825748A (en) * | 1971-08-07 | 1973-04-04 | ||
| JPS4826239A (en) * | 1971-08-10 | 1973-04-06 | ||
| JPS55103938A (en) * | 1979-02-02 | 1980-08-08 | Hitachi Ltd | Forming device for plastic hinge |
| JPS56121748A (en) * | 1980-02-29 | 1981-09-24 | Nissei Plastics Ind Co | Injection molding method |
| JPS58197032A (en) * | 1982-05-12 | 1983-11-16 | Ricoh Co Ltd | Injection-compressive molding machine |
| JPS59178230A (en) * | 1983-03-30 | 1984-10-09 | Nippon Plast Co Ltd | Injection-compression molding method |
| JPS6021225A (en) * | 1983-07-15 | 1985-02-02 | Idemitsu Petrochem Co Ltd | Injection compression molding method |
| JPS6056506A (en) * | 1983-09-09 | 1985-04-02 | 株式会社豊田中央研究所 | Injection molding method and device |
| JPS60234814A (en) * | 1984-05-08 | 1985-11-21 | Olympus Optical Co Ltd | Injection molding and method and apparatus thereof |
| JPS61125825A (en) * | 1984-11-24 | 1986-06-13 | Daiichi Kasei Kk | Manufacture of resin formed product with thin wall part |
-
1986
- 1986-07-16 JP JP61167545A patent/JPH0763983B2/en not_active Expired - Lifetime
Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2578719A (en) * | 1944-06-14 | 1951-12-18 | Autograf Brush & Plastics Co I | Injection molding apparatus |
| JPS4825748A (en) * | 1971-08-07 | 1973-04-04 | ||
| JPS4826239A (en) * | 1971-08-10 | 1973-04-06 | ||
| JPS55103938A (en) * | 1979-02-02 | 1980-08-08 | Hitachi Ltd | Forming device for plastic hinge |
| JPS56121748A (en) * | 1980-02-29 | 1981-09-24 | Nissei Plastics Ind Co | Injection molding method |
| JPS58197032A (en) * | 1982-05-12 | 1983-11-16 | Ricoh Co Ltd | Injection-compressive molding machine |
| JPS59178230A (en) * | 1983-03-30 | 1984-10-09 | Nippon Plast Co Ltd | Injection-compression molding method |
| JPS6021225A (en) * | 1983-07-15 | 1985-02-02 | Idemitsu Petrochem Co Ltd | Injection compression molding method |
| JPS6056506A (en) * | 1983-09-09 | 1985-04-02 | 株式会社豊田中央研究所 | Injection molding method and device |
| JPS60234814A (en) * | 1984-05-08 | 1985-11-21 | Olympus Optical Co Ltd | Injection molding and method and apparatus thereof |
| JPS61125825A (en) * | 1984-11-24 | 1986-06-13 | Daiichi Kasei Kk | Manufacture of resin formed product with thin wall part |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0345321A (en) * | 1989-07-14 | 1991-02-26 | Toyo Seikan Kaisha Ltd | Molding method and its die for plug body for liquid transportation |
| US5405259A (en) * | 1991-06-18 | 1995-04-11 | Sumitomo Heavy Industries, Ltd. | Injection molding machine using a pulsating pressing force |
| WO1993024298A1 (en) * | 1992-06-02 | 1993-12-09 | Sumitomo Heavy Industries, Ltd. | Localized pressurizing type injection molding machine |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0763983B2 (en) | 1995-07-12 |
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