JPH07106581B2 - Mold for manufacturing hollow molded products - Google Patents
Mold for manufacturing hollow molded productsInfo
- Publication number
- JPH07106581B2 JPH07106581B2 JP1970190A JP1970190A JPH07106581B2 JP H07106581 B2 JPH07106581 B2 JP H07106581B2 JP 1970190 A JP1970190 A JP 1970190A JP 1970190 A JP1970190 A JP 1970190A JP H07106581 B2 JPH07106581 B2 JP H07106581B2
- Authority
- JP
- Japan
- Prior art keywords
- push
- pin
- cavity
- fluid injection
- fluid
- 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.)
- Expired - Lifetime
Links
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
- B29C45/1703—Introducing an auxiliary fluid into the mould
- B29C45/1734—Nozzles therefor
-
- 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
- B29C45/40—Removing or ejecting moulded articles
- B29C45/4005—Ejector constructions; Ejector operating mechanisms
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
- Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は，中空成形品製造用の成形型，特にその流体注
入経路の構成に関する。Description: TECHNICAL FIELD The present invention relates to a molding die for producing a hollow molded article, and particularly to the structure of a fluid injection path thereof.
合成樹脂の中空成形品は，成形型のキャビティ内に軟化
状態の合成樹脂を射出すると共に，該合成樹脂内に窒素
ガス，水等の流体を注入して，その内部を中空とするこ
とにより製造する。Hollow molded articles of synthetic resin are manufactured by injecting a synthetic resin in a softened state into the cavity of a mold and injecting a fluid such as nitrogen gas or water into the synthetic resin to make the inside hollow. To do.
従来，かかる中空成形品の製造に用いる成形型として
は，第４図に示すごとく，固定板91に配設した固定型92
と，可動板931に設けた可動型93と，両者の間に形成し
たキャビティ90と，該キャビティ90内に軟化状態の合成
樹脂81を射出するためのスプルー920と，該キャビティ9
0内の軟化状態の合成樹脂81内に流体85を注入するため
の流体注入経路86とよりなる（特開昭58−211425号公
報）。Conventionally, as a molding die used for manufacturing such a hollow molded article, as shown in FIG. 4, a fixed die 92 mounted on a fixed plate 91 is used.
A movable die 93 provided on the movable plate 931; a cavity 90 formed between the two; a sprue 920 for injecting the softened synthetic resin 81 into the cavity 90;
A fluid injection path 86 for injecting the fluid 85 into the softened synthetic resin 81 in 0 (Japanese Patent Laid-Open No. 58-211425).
また，可動型93には，成形された中空成形品を成形型の
外部へ押し出すための押し上げピン95を貫挿，配設す
る。また，上記固定板91に垂設したガイドロッド96の下
方は，可動板931の側方部分に嵌挿する。In addition, a push-up pin 95 for pushing out the molded hollow molded product to the outside of the molding die is inserted and arranged in the movable die 93. Further, the lower part of the guide rod 96 hung on the fixed plate 91 is fitted and inserted in the lateral part of the movable plate 931.
また，上記押し上げピン95の下方には押し上げ板94を連
結する。押し上げ板94は，これを上下動させるアクチュ
エータ（図示略）に接続する。上下流体注入経路86は可
動型93内及び可動板931内を挿通したパイプにより構成
されている。また，固定型92の上記スプルー920には，
固定板91に設けた射出用ノズル71を連結する。A push-up plate 94 is connected below the push-up pin 95. The push-up plate 94 is connected to an actuator (not shown) that moves it up and down. The upper and lower fluid injection paths 86 are formed by pipes inserted through the movable die 93 and the movable plate 931. In addition, in the above-mentioned sprue 920 of the fixed type 92,
The injection nozzle 71 provided on the fixed plate 91 is connected.
また，固定型92と可動型93とには，それぞれキャビティ
90に面して，多数の冷却管97を設ける。In addition, the fixed mold 92 and the movable mold 93 respectively have a cavity.
A large number of cooling pipes 97 are provided facing 90.
そして，中空成形品の製造に当たっては，第４図に示す
ごとく，射出用ノズル71よりキャビティ90内に軟化状態
の合成樹脂81を射出する。この合成樹脂の射出量は，キ
ャビティ容積（即ち中空成形品容積）から中空部（即ち
流体注入量）を差し引いた容量である。そして，上記射
出後直ちに，窒素ガス等の流体85を流体注入経路85を通
じて注入する。Then, in manufacturing the hollow molded product, as shown in FIG. 4, the synthetic resin 81 in a softened state is injected from the injection nozzle 71 into the cavity 90. The injection amount of the synthetic resin is the volume obtained by subtracting the hollow portion (that is, the fluid injection amount) from the cavity volume (that is, the hollow molded product volume). Immediately after the injection, a fluid 85 such as nitrogen gas is injected through the fluid injection path 85.
これにより、キャビティ90内の軟化状態の合成樹脂81
は，その内部に注入されてくる流体85によって，キャビ
ティ壁面及びキャビティ空間部分へ押し付けられる。そ
して，合成樹脂81とその内部の流体85とによって，キャ
ビティ90内が充満された後，冷却管97に水を流し，合成
樹脂81を冷却，固化させる。As a result, the softened synthetic resin 81 in the cavity 90
Is pressed against the cavity wall surface and the cavity space portion by the fluid 85 injected therein. Then, after the cavity 90 is filled with the synthetic resin 81 and the fluid 85 therein, water is caused to flow through the cooling pipe 97 to cool and solidify the synthetic resin 81.
その後は，可動型93及び可動板931を，該可動板931に設
けた枠75を介して，可動型進退用アクチュエータロッド
76により，下降させる。これにより，固定型92と可動型
93とが離れ，キャビティ90が開口する。そこで，押し上
げピン95を押し上げ板94により押し下げ，キャビティ内
の中空成形品を取り出す。After that, the movable die 93 and the movable plate 931 are moved through the frame 75 provided on the movable plate 931 to move the movable die actuator rod.
Lower with 76. This allows the fixed type 92 and movable type
93 is separated, and the cavity 90 is opened. Therefore, the push-up pin 95 is pushed down by the push-up plate 94, and the hollow molded product in the cavity is taken out.
しかしながら，上記従来の成形型においては，固定型9
2,可動型93には，冷却管97を設ける他，入れ子用油圧配
管，更には上記押し上げピン95を設けなければならな
い。However, in the above conventional forming die, the fixed die 9
2. The movable die 93 must be provided with the cooling pipe 97, the hydraulic pipe for nesting, and the push-up pin 95.
また，両型にはキャビティ90を形成するための型面を設
けなければならないが，近年は中空成形品の形状が複雑
なため、型面が複雑となっている。更には両型共に，そ
の周囲には第３図に示すごとく，ガイドロッド96,アク
チュエータロッド76等の付属部品が設けてある。Further, both molds must be provided with a mold surface for forming the cavity 90, but in recent years, the mold surface has become complicated due to the complicated shape of the hollow molded product. Further, as shown in FIG. 3, both types are provided with accessory parts such as a guide rod 96 and an actuator rod 76 around them.
そのため，流体注入経路の配設が困難であり，更には成
形型の設計が困難である。Therefore, it is difficult to arrange the fluid injection path, and it is also difficult to design the molding die.
本発明はかかる従来の問題点に鑑み，流体注入経路の配
設，及び成形型全体の設計が容易な中空成形品製造用の
成形型を提供しようとするものである。In view of the above conventional problems, the present invention aims to provide a molding die for manufacturing a hollow molded product, in which the fluid injection path is arranged and the entire molding die is easily designed.
本発明は，合成樹脂の中空成形品を成形するためのキャ
ビティと，該キャビティ内に軟化状態の合成樹脂を射出
するスプルーと，キャビティ内の上記軟化状態の合成樹
脂中に中空部成形用の流体を注入するための流体注入経
路と，成形された中空成形品を成形型の外部へ押し出す
ための押し上げピンとを有する中空成形品製造用の成形
型において，上記流体注入経路は，押し上げピンの内部
を中空状となすことにより設け，また押し上げピンの先
端部はキャビティとの対向面に直径0.02〜0.2mmの流体
注入口を有し，また押し上げピンの基端部は流体パイプ
に接続してなることを特徴とする中空成形品製造用の成
形型にある。The present invention relates to a cavity for molding a hollow synthetic resin product, a sprue for injecting a softened synthetic resin into the cavity, and a fluid for molding a hollow portion in the softened synthetic resin in the cavity. In a molding die for producing a hollow molded article, the fluid injection path having a fluid injection path for injecting and a push-up pin for extruding the molded hollow-molded article to the outside of the molding die. Provided by making it hollow, the tip of the push-up pin has a fluid injection port with a diameter of 0.02 to 0.2 mm on the surface facing the cavity, and the base end of the push-up pin is connected to the fluid pipe. The present invention relates to a molding die for producing a hollow molded article.
本発明において最も注目すべきことは，流体注入経路を
押し上げピン内に設けて両者を一体化したこと，及び押
し上げピンの先端部の流体注入口は上記特定の直径範囲
としたことにある。What is most noticeable in the present invention is that the fluid injection path is provided in the push-up pin to integrate them, and that the fluid injection port at the tip of the push-up pin is in the above specific diameter range.
上記押し上げピンは，前記のごとく，製造された中空成
形品をキャビティより押し出すためのものであると共
に，上記流体注入経路ともなるものである。As described above, the push-up pin serves to push the manufactured hollow molded product out of the cavity and also serves as the fluid injection path.
また，上記流体注入口は直径0.02〜0.2mmとする。0.02m
m未満では，軟化状態の合成樹脂内へ注入する流体の容
量速度が充分得られない。そのため，軟化状態の合成樹
脂，及びその中のガス等の流体がキャビティ内に充満す
る前に，軟化状態の合成樹脂先端部が冷却，固化し，所
望する中空成形品が得られないおそれがある。また，中
級成形品の生産速度が低下する。The diameter of the fluid inlet is 0.02 to 0.2 mm. 0.02m
If it is less than m, the volume velocity of the fluid injected into the softened synthetic resin cannot be sufficiently obtained. Therefore, the synthetic resin tip in the softened state may be cooled and solidified before the softened synthetic resin and the fluid such as the gas therein are filled in the cavity, and the desired hollow molded article may not be obtained. . In addition, the production rate of intermediate-grade molded products decreases.
一方,0.2mmを越えると，キャビティ内に射出された軟化
状態の合成樹脂が，その高圧（400〜500kg/cm2）のため
に，押し上げピンの流体注入口から流体注入経路内に侵
入するおそれがある。On the other hand, if it exceeds 0.2 mm, the softened synthetic resin injected into the cavity may enter the fluid injection path from the fluid injection port of the push-up pin due to its high pressure (400 to 500 kg / cm 2 ). There is.
上記流体注入口の形状は，円形，楕円形，角形など任意
である。また，上記直径とは，最長径部分の長さをい
う。The shape of the fluid injection port is arbitrary, such as circular, elliptical, or rectangular. Further, the above-mentioned diameter means the length of the longest diameter portion.
また，上記のごとく，流体注入経路は押し上げピンと一
体的に設けるが，かかる押し上げピンは１本ないし複数
本設ける。複数本設けた場合には，各箇所より流体注入
が行われる。また，本発明にかかる流体注入経路付押し
上げピンと共に，従来と同様の流体注入経路のない押し
上げピンを併設できることは勿論である。Further, as described above, the fluid injection path is provided integrally with the push-up pin, but one or more push-up pins are provided. When multiple lines are provided, the fluid is injected from each location. In addition to the push-up pin with the fluid injection path according to the present invention, it goes without saying that a push-up pin having no fluid injection path similar to the conventional one can be provided.
また，押し上げピンの先端部は，キャビティの内壁と面
一（第１図），或いは若干突出した状態（第３図）とす
る。The tip of the push-up pin is flush with the inner wall of the cavity (Fig. 1) or slightly protruded (Fig. 3).
また，上記流体注入経路には，上記押し上げピンの基端
部分又は該押し上げピンに接続した流体用パイプに，逆
止弁を設けることもできる。これにより，軟化状態の合
成樹脂の流体注入経路内に逆流することを，確実に防止
することができる。Further, a check valve can be provided in the fluid injection path at the base end portion of the push-up pin or at the fluid pipe connected to the push-up pin. As a result, it is possible to reliably prevent the softened synthetic resin from flowing back into the fluid injection path.
本発明においては，キャビティ内に軟化状態の合成樹脂
を射出した後，押し上げピン先端部の流体注入口より，
軟化状態の合成樹脂内にガス，水等の流体を注入する。
そして，従来，と同様に中空成形品を製造する。また，
中空成形品の製造後は，キャビティを開き，上記押し上
げピンを押し上げて，キャビティ内の中空成形品を押し
出す。In the present invention, after injecting the softened synthetic resin into the cavity, the fluid injection port at the tip of the push-up pin
A fluid such as gas or water is injected into the softened synthetic resin.
Then, a hollow molded product is manufactured in the same manner as in the past. Also,
After manufacturing the hollow molded product, the cavity is opened, and the push-up pin is pushed up to push out the hollow molded product in the cavity.
そして，本発明においては，流体注入経路は押し上げピ
ン内に設けたので，従来のごとく固定型，可動型などの
内部にこれを貫通する流体注入経路を別個に設ける必要
がない。また，そのため，成形型のスペース余裕ができ
る。また，流体注入経路と押し上げピンとを一体化した
ので，成形型の構造も簡単になる。In addition, in the present invention, since the fluid injection path is provided in the push-up pin, it is not necessary to separately provide a fluid injection path which penetrates the inside of a fixed type, a movable type, etc. as in the conventional case. Also, therefore, a space for the molding die can be provided. Moreover, since the fluid injection path and the push-up pin are integrated, the structure of the molding die is simplified.
また，本発明においては，流体注入口は上記特定の直径
を有するので，軟化状態の合成樹脂が押し上げピン内の
流体注入経路へ侵入することがなく，また適切速度で軟
化状態の合成樹脂内へ流体を注入することができる。Further, in the present invention, since the fluid injection port has the above-mentioned specific diameter, the softened synthetic resin does not enter the fluid injection path in the push-up pin, and the softened synthetic resin enters the softened synthetic resin at an appropriate speed. A fluid can be injected.
したがって、本発明によれば，流体注入経路の配設，及
び成形型全体の設計が容易な，中空成形品製造用の成形
型を提供することができる。Therefore, according to the present invention, it is possible to provide a molding die for manufacturing a hollow molded product, in which the arrangement of the fluid injection path and the design of the entire molding die are easy.
第１実施例 本発明の実施例にかかる，中空成形品製造用の成形型に
つき，第１図及び第２図を用いて説明する。First Embodiment A molding die for producing a hollow molded product according to an embodiment of the present invention will be described with reference to FIGS. 1 and 2.
本発明の成形型は，可動型93内を貫通して,2本の押し上
げピン１を設ける。該押し上げピン１は，その内部に中
空状の流体注入経路10を有する。そして，押し上げピン
１の先端部11の上面は，成形型を閉じたときには，可動
型93の型面935と同一面上になるよう配設されている。
また，該先端部11には，流体注入経路10の流体注入口10
1が開口している。該流体注入口101は，円形開口部で，
直径0.1mmである。また，流体注入経路の直径は1mmであ
る。The molding die of the present invention is provided with two push-up pins 1 penetrating through the movable die 93. The push-up pin 1 has a hollow fluid injection path 10 therein. The top surface of the tip portion 11 of the push-up pin 1 is arranged so as to be flush with the die surface 935 of the movable die 93 when the molding die is closed.
Further, the tip 11 has a fluid injection port 10 of the fluid injection path 10.
1 is open. The fluid inlet 101 is a circular opening,
The diameter is 0.1 mm. The diameter of the fluid injection path is 1 mm.
一方，押し上げピンの１の基端部12には，加圧窒素ガス
源に接続した流体パイプ15を接続する。該流体パイプ15
は，押し上げピン１の上下動に追従できるように，フレ
キシブルホースである。また，押し上げピン１の基端部
12の近傍には，従来と同様の押し上げ板94を連結する。
その他は前記従来例（第４図）と同様である。On the other hand, a fluid pipe 15 connected to a pressurized nitrogen gas source is connected to the base end 12 of the push-up pin 1. The fluid pipe 15
Is a flexible hose so that it can follow the vertical movement of the push-up pin 1. Also, the base end of the push-up pin 1
A push-up plate 94 similar to the conventional one is connected to the vicinity of 12.
Others are the same as the above-mentioned conventional example (FIG. 4).
本例の成形型を用いて中空成形品を製造するに当たって
は，従来と同様にキャビティ90内に軟化状態の合成樹脂
（図示略）を射出する。そして，該軟化状態の合成樹脂
が流体注入口101よりも外側に位置した時点で，押し上
げピン１中の流体注入経路10を通じて，流体注入口101
より窒素ガスを用いた流体85を注入する。そして，従来
と同様に中空成形品を製造する。When manufacturing a hollow molded product using the mold of this example, a synthetic resin (not shown) in a softened state is injected into the cavity 90 as in the conventional case. Then, when the softened synthetic resin is located outside the fluid injection port 101, the fluid injection port 101 passes through the fluid injection path 10 in the push-up pin 1.
A fluid 85 using more nitrogen gas is injected. Then, a hollow molded product is manufactured in the same manner as in the past.
成形後，可動型93を下降させて，キャビティ90を開き，
次いで押し上げ板94を上昇させて押し上げピン１を押し
上げる。これにより，キャビティ内の中空成形品は外へ
出される。After molding, lower the movable mold 93 to open the cavity 90,
Then, the push-up plate 94 is raised to push up the push-up pin 1. As a result, the hollow molded product in the cavity is ejected to the outside.
上記のごとく，本例の成形型によれば，流体注入経路は
押し上げるピン内に設けてあるので，固定型，可動型な
どの内部にこれを貫通する流体注入経路を別個に設ける
必要がない。また，そのため，成形型のスペースに余裕
ができ，構造も簡単となる。As described above, according to the molding die of this example, since the fluid injection path is provided in the push-up pin, it is not necessary to separately provide a fluid injection path that penetrates the fixed mold, the movable mold, and the like. Therefore, the space for the molding die can be increased and the structure is simplified.
また，流体注入口は上記のごとく細径としたので，押し
上げピン内へ軟化状態の合成樹脂が侵入することもな
く，また適切速度で流体を注入することができる。Further, since the fluid injection port has the small diameter as described above, the softened synthetic resin does not enter the push-up pin and the fluid can be injected at an appropriate speed.
第２実施例 本例は，第３図に示すごとく，第１実施例の成形型にお
いて，押し上げピン１の先端部11を，キャビティ90内へ
若干突出させて配設したものである。その他は第１実施
例と同様である。Second Embodiment In this embodiment, as shown in FIG. 3, in the mold of the first embodiment, the tip 11 of the push-up pin 1 is arranged so as to slightly project into the cavity 90. Others are the same as those in the first embodiment.
本例においても，第１実施例と同様の効果を得ることが
できる。Also in this example, the same effect as that of the first example can be obtained.
第１図及び第２図は第１実施例の成形型を示し，第１図
はその断面図，第２図は可動型の型面の要部平面図，第
３図は第２実施例の成形型の要部断面図，第４図は従来
の成形型の断面図である。 １……押し上げピン， 10……流体注入経路， 101……流体注入口， 11……先端部， 12……基端部， 90……キャビティ， 92……固定型， 93……可動型，1 and 2 show the molding die of the first embodiment, FIG. 1 is a cross-sectional view thereof, FIG. 2 is a plan view of the main part of the mold surface of the movable die, and FIG. 3 is of the second embodiment. FIG. 4 is a sectional view of a main part of a molding die, and FIG. 4 is a sectional view of a conventional molding die. 1 ... Push-up pin, 10 ... Fluid injection path, 101 ... Fluid injection port, 11 ... Tip, 12 ... Proximal end, 90 ... Cavity, 92 ... Fixed type, 93 ... Movable type,
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.6 識別記号 庁内整理番号 ＦＩ 技術表示箇所 Ｂ２９Ｃ 49/58 7619−4Ｆ // Ｂ２９Ｌ 22:00 ─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. 6 Identification code Office reference number FI technical display location B29C 49/58 7619-4F // B29L 22:00
Claims (1)
ャビティと，該キャビティ内に軟化状態の合成樹脂を射
出するスプルーと，キャビティ内の上記軟化状態の合成
樹脂中に中空部成形用の流体を注入するための流体注入
経路と，成形された中空成形品を成形型の外部へ押し出
すための押し上げピンとを有する中空成形品製造用の成
形型において， 上記流体注入経路は，押し上げピンの内部を中空状とな
すことにより設け，また押し上げピンの先端部はキャビ
ティとの対向面に直径0.02〜0.2mmの流体注入口を有
し，また押し上げピンの基端部は流体パイプに接続して
なることを特徴とする中空成形品製造用の成形型。1. A cavity for molding a hollow molded article of synthetic resin, a sprue for injecting a softened synthetic resin into the cavity, and a cavity for molding a hollow portion in the softened synthetic resin in the cavity. In a mold for producing a hollow molded product, the mold having a fluid injection route for injecting a fluid and a push-up pin for pushing the molded hollow molded product to the outside of the mold, wherein the fluid injection route is the inside of the push-up pin. Is made hollow, and the tip of the push-up pin has a fluid injection port with a diameter of 0.02 to 0.2 mm on the surface facing the cavity, and the base end of the push-up pin is connected to the fluid pipe. A mold for producing a hollow molded article, which is characterized in that
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1970190A JPH07106581B2 (en) | 1990-01-30 | 1990-01-30 | Mold for manufacturing hollow molded products |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1970190A JPH07106581B2 (en) | 1990-01-30 | 1990-01-30 | Mold for manufacturing hollow molded products |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH03222713A JPH03222713A (en) | 1991-10-01 |
| JPH07106581B2 true JPH07106581B2 (en) | 1995-11-15 |
Family
ID=12006575
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1970190A Expired - Lifetime JPH07106581B2 (en) | 1990-01-30 | 1990-01-30 | Mold for manufacturing hollow molded products |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH07106581B2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6106260A (en) * | 1995-03-03 | 2000-08-22 | Sumitomo Chemical Company, Limited | Mold useful in the production of hollow thermoplastic molded articles |
| US6164953A (en) * | 1998-03-12 | 2000-12-26 | Patent Holding Company | Method and mold to make plastic articles having reduced surface defects and assembly for use therein |
| US6042361A (en) * | 1998-03-12 | 2000-03-28 | Larry J. Winget | Mold for use in plastic injection molding system and venting pin assembly for use therein |
-
1990
- 1990-01-30 JP JP1970190A patent/JPH07106581B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH03222713A (en) | 1991-10-01 |
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