JPH049651B2 - - Google Patents
Info
- Publication number
- JPH049651B2 JPH049651B2 JP30703487A JP30703487A JPH049651B2 JP H049651 B2 JPH049651 B2 JP H049651B2 JP 30703487 A JP30703487 A JP 30703487A JP 30703487 A JP30703487 A JP 30703487A JP H049651 B2 JPH049651 B2 JP H049651B2
- Authority
- JP
- Japan
- Prior art keywords
- tube
- diaphragm
- mold
- female mold
- gas vent
- 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
Links
- 238000004519 manufacturing process Methods 0.000 claims description 21
- 238000000034 method Methods 0.000 claims description 12
- 230000013011 mating Effects 0.000 claims description 11
- 238000000465 moulding Methods 0.000 claims description 7
- 239000000088 plastic resin Substances 0.000 claims description 6
- 238000001746 injection moulding Methods 0.000 claims description 5
- 229920005989 resin Polymers 0.000 description 29
- 239000011347 resin Substances 0.000 description 29
- 238000002347 injection Methods 0.000 description 20
- 239000007924 injection Substances 0.000 description 20
- 229920003023 plastic Polymers 0.000 description 6
- 239000004033 plastic Substances 0.000 description 6
- 238000007872 degassing Methods 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 238000013022 venting Methods 0.000 description 3
- BZHJMEDXRYGGRV-UHFFFAOYSA-N Vinyl chloride Chemical compound ClC=C BZHJMEDXRYGGRV-UHFFFAOYSA-N 0.000 description 2
- 239000008280 blood Substances 0.000 description 2
- 210000004369 blood Anatomy 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 238000001802 infusion Methods 0.000 description 2
- 229920005992 thermoplastic resin Polymers 0.000 description 2
- 238000004891 communication Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000005038 ethylene vinyl acetate Substances 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 238000003908 quality control method Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Landscapes
- Moulds For Moulding Plastics Or The Like (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
Description
〔産業上の利用分野〕
本発明は、血液バツグ、輸液バツグ等の医療用
容器等に取り付けられている隔膜を有するチユー
ブの製造方法に関する。
〔従来の技術〕
隔膜を有するチユーブは、血液バツグ、輸液バ
ツグなどの医療用容器の排出口及び混注口に取り
付けられて使用されている。これは、使用直前ま
で容器内部を無菌状態で維持されるように、外部
と遮断できる隔膜をチユーブの内部通路に備え、
使用時に、刺通針等でこの隔膜を刺通することに
より外部と連通できるようにするためである。
従来、このような排出口及び混注口等に取り
付けられる隔膜を有するチユーブは、軟質塩化ビ
ニル樹脂のような熱可塑性樹脂（以下単に樹脂と
いう）により、押出成型によつて得られたチユー
ブを切断した後、該チユーブ内に同材質の樹脂で
予め作つた隔膜を高周波融着して形成していた。
又、射出成型することにより隔膜を有するチユ
ーブを一体成型する技術として、本出願人による
特願昭61−235298号がある。この技術は、第１０
図に示すような射出成型金型が使用される。すな
わち、この射出成型金型１は、隔膜付チユーブ４
のチユーブ５の外壁面５ａを成型するメス金型２
と、チユーブ５の内壁面５ｂを成型すると共にメ
ス金型２内に上下方向から挿入してこれらの間に
形成される空間で隔膜６を成型する２個のオス金
型７，８と、該オス金型７，８の軸芯部に夫々嵌
挿されるガス抜きピン９，９とから成る。そし
て、メス金型２の軸方向略中央部には、180度対
称的に凸部１０，１０が設けられ、これら凸部１
０，１０には樹脂を射出するゲート３ａ，３ｂが
180度対称的に設けられている。又、２個のオス
金型７，８の先端面７ａ，７ｂによつて成型され
る隔膜６の膜厚は、メス金型２のゲート３ａ，３
ｂ周辺の凸部１０，１０とオス金型７，８の周面
とによつて成型されるチユーブ５の肉厚以下にな
つている。従つて、この射出成型金型１のメス金
型２に180度対称的に設けられたゲート３ａ，３
ｂから樹脂を射出すると、樹脂は、まず隔膜６側
に注入し始めてからチユーブ５側に注入する。隔
膜６側に注入した樹脂は、互いに向い合いながら
流入し、ゲート３ａ，３ｂから略等位置にて直線
状に当接して隔膜６を成型すると共に、ゲート５
の末端にも樹脂が流入してチユーブ５を成型し
て、その結果、隔膜付チユーブ４が射出成型され
る。
〔発明が解決しようとする問題点〕
しかしながら、上述のようなの従来の方法で
は、隔膜付チユーブを製造する工程が多く複雑で
あるため、生産性が低く製造能力を向上させるこ
とが困難で、コスト的にも高くなる。又、一体成
型でないため、ピンホールが生じやすく、且つ、
その隔膜の厚みが均一でない等の問題点がある。
又、の方法では、メス金型２のゲート３ａ，
３ｂから隔膜６側に注入された樹脂は、互いに向
い合いながら注入してゲート３ａ，３ｂから略等
位置にて直線状に当接するが、この過程で樹脂に
よつて圧縮されたガスは、ガス抜きピン９，９と
オス金型７，８との間から排出される。しかし、
ガス抜きピン９，９が円柱状の一体構成であるた
め、圧縮されたガスは、円柱状のガス抜きピン
９，９の周縁と前述の樹脂が当接して形成される
直線との交叉する点から最終的に抜けるようにな
るため、ガス抜けが不充分となりピンホールが生
じやすくなる。
そこで、本発明は上記事情に鑑みてなされたも
ので、製造工程が単純で生産性が高く、従つて低
コストを実現することが出来、しかもピンホール
がない隔膜を有するチユーブの製造方法を提供す
ることを目的とする。
〔問題点を解決するための手段〕
上記問題点を解決するため、本発明の隔膜を有
するチユーブの製造方法は、チユーブの外壁面を
成型するために用いられ、互いに対向する位置に
あり、且つそれぞれにゲートを設けられたメス金
型と、チユーブの内壁面を成型するために用いら
れると共に前記メス金型内に上下方向から挿入し
て前記チユーブ内に隔膜を成型するために用いら
れ、且つガス抜きピンが中心部軸方向に嵌挿され
たオス金型とからなる射出成型金型に、前記メス
金型のゲートを介して可塑性樹脂を射出して成型
する隔膜を有するチユーブの製造方法であつて、
前記オス金型に嵌挿された前記ガス抜きピンを、
少なくとも前記ゲート数に応じて分割して構成す
ると共にその分割位置を前記ゲートから等距離と
し、その分割体の合せ面から、可塑性樹脂を射出
成型する時のガスを抜くようにしたものである。
〔作用〕
上記構成によれば、メス金型の夫々のゲートか
ら隔膜側に流入した可塑性樹脂は、互いに向い合
いながら進み、夫々ゲートから等位置にあるガス
抜きピンの分割体の合せ面に沿つて、これら可塑
性樹脂が当接し、その過程で可塑性樹脂により圧
縮されたガスが前記分割体の合せ面から完全に抜
け、当接した可塑性樹脂は混ざり合い完全にガス
抜けが行われる。
〔実施例〕
以下、本発明の実施例を第１図乃至第９図に基
づいて詳述する。
第１図は、本発明の製造方法を適用する射出成
型金型の断面図、第２図は本発明の製造方法によ
つて製造された隔膜付チユーブを一部切欠した斜
視図、第３図は射出成型金型のオス金型を一部切
欠した斜視図、第４図はオス金型に嵌挿される２
分割状態のガス抜きピンの斜視図、第５図は組み
立てた状態のガス抜きピンの斜視図である。
図において、１は射出成型金型を示し、該射出
成型金型１に熱可塑性樹脂（以下単に樹脂とい
う）が供給される。この樹脂は、軟質塩化ビニル
樹脂、エチレン−酢酸ビニル共重合体等が使用さ
れる。この樹脂の粒状材料を加熱して、流体状に
なるまで融解し、この流体状の樹脂を射出成型金
型１のメス金型２の２つのゲート３ａ，３ｂから
高圧にて金型キヤビテイＡに射出する。この際使
用される射出成型金型１は、隔膜付チユーブ４の
チユーブ５の外壁面５ａを成型する前記メス金型
２と、チユーブ５の内壁面５ｂを成型すると共に
メス金型２に上下方向から挿入して、これらの間
に隔膜６を成型する２個のオス金型７，８と、該
オス金型７，８の軸芯部に夫々嵌挿されると共に
２分割とされたガス抜きピン９とから成り、これ
らメス金型２とオス金型７，８とにより前記金型
キヤビテイＡが画成される。そして、このメス金
型２の軸方向の略中央部には、180度対称的に凸
部１０，１０が設けられている。この凸部１０，
１０には、前記樹脂を射出する前記ゲート３ａ，
３ｂが180度対称的に設けられている。又、２個
のオス金型７，８の先端面７ａと８ａとの長さl1
すなわち、隔膜６の膜厚は、メス金型２のゲート
３ａ，３ｂ周辺の凸部１０，１０とオス金型７，
８の周面との長さl2、すなわち、この位置のチユ
ーブ５の壁厚よりも厚くなつている。従つて、ゲ
ート３ａ，３ｂから樹脂を射出すると、まず、抵
抗の少ないオス金型７，８の先端面７ａ，８ａ間
に、すなわち隔膜６側に流入するようになる。
尚、前述の２個のオス金型７，８の先端面７ａ
と８ａとの長さl1、すなわち、隔膜６の膜厚は、
１mm以下とされ、使用時刺通針により容易に刺通
することが出来ると共に製造上及び強度的に充分
な厚みに設定されている。
前記ガス抜きピン９は、前記メス金型２に設け
られるゲート数に応じて分割して構成されると共
にその分割位置を前記オス金型７，８に嵌挿され
た時メス金型２のゲート３ａ，３ｂから等距離と
する必要があるから、第３図及び第４図に示すよ
うに、ガス抜きピン９は半円に、すなわち、半円
柱体（分割体）１１，１２に分割されている。こ
のガス抜きピン９は、これら半円柱体１１，１２
の先端側の合せ面１１ａ，１２ａの縁部に沿つ
て、Ｌ字状の溝１１ｂ，１２ｂが刻設されてい
る。そして、このガス抜きピン９は、第５図に示
すように、これら半円柱体１１，１２の合せ面１
１ａ，１２ａを合せることにより一体となり、コ
字状の溝Ｂが形成される。このコ字状の溝Ｂはそ
の幅が0.01mm〜1.0mmで、その深さが0.01mm〜1.0
mmの範囲とされ、好ましくは、その幅が0.1mm〜
0.7mmでその深さが0.05mm〜0.3mmの範囲とされる。
又、このガス抜きピン９は第６図に示すように、
半円柱体１１，１２の間に溝Ｂを形成すべく、こ
れら半円柱体１１，１２の全長よりやや短い板状
体１３を挾んで構成したもので良い。
以上のように構成されているガス抜きピン９を
嵌挿している前記オス金型７，８は、前記メス金
型２に挿入される際、ガス抜きピン９の溝Ｂが前
記メス金型２の180度対称的に設けられたゲート
３ａ，３ｂを結ぶ線に対して直交する位置となる
ようにメス金型２に挿入される。
次に、上述の射出成型金型１のメス金型２の２
つのゲート３ａ，３ｂから高圧にて前述の金型キ
ヤビテイＡに射出された樹脂は、ゲート３ａ，３
ｂの周辺の凸部１０，１０とオス金型７，８の周
面との長さl2よりもオス金型７，８の先端面７
ａ，８ａとの長さl1の方が長いから、第７図に示
すように、抵抗の少ないオス金型７，８の先端面
７ａ，８ａの間の方に先に注入し始め、そのあ
と、凸部１０，１０とオス金型７，８の周面間側
に流入する。そして、オス金型７，８の先端面７
ａ，８ａ間に流入した樹脂は、第８図に示すよう
に、ゲート３ａ，３ｂから互いに向い合いながら
流入して、略ゲート３ａ，３ｂから略等位置に
て、略直線状に当接する。この直線状の当接ライ
ンと前記オス金型７，８に嵌挿されたガス抜きピ
ン９，９の溝Ｂ，Ｂとが重なる。この過程で樹脂
によつて金型キヤビテイＡのガスが圧縮され、こ
の圧縮されたガスは溝Ｂ，Ｂを介して半円柱体１
１，１２の合せ面１１ａ，１２ａから排出され
る。従つて、この圧縮されたガスは完全に抜け、
当接した樹脂は互いに完全に混ざり合いピンホー
ルのない隔膜６を成型する。この間、凸部１０，
１０とオス金型７，８の周面との間側に注入した
樹脂も、第９図に示すように、チユーブを構成す
る金型キヤビテイＡ内の末端に注入されてチユー
ブ５を成型する。このようにして成型された隔膜
付チユーブ４は、冷却後、射出成型金型１を外し
て製品とされる。
次に、第１図乃至第９図に示す本発明の隔膜を
有するチユーブの製造方法に基づいて製作したサ
ンプルＣ及び第１０図の従来の隔膜を有するチユ
ーブの製造方法に基づいて製作したサンプルＥの
ピンホール試験を行いその結果を表−１に示す。
[Industrial Application Field] The present invention relates to a method for manufacturing a tube having a diaphragm attached to a medical container such as a blood bag or an infusion bag. [Prior Art] A tube having a diaphragm is used by being attached to the outlet or mixed injection port of a medical container such as a blood bag or an infusion bag. This tube is equipped with a diaphragm in the internal passageway that can be sealed off from the outside so that the inside of the container is maintained in a sterile state until just before use.
This is to enable communication with the outside by piercing this diaphragm with a piercing needle or the like during use. Conventionally, tubes with diaphragms attached to such discharge ports and mixed injection ports have been made by cutting tubes obtained by extrusion molding of thermoplastic resin (hereinafter simply referred to as resin) such as soft vinyl chloride resin. Thereafter, a diaphragm previously made of the same resin was formed in the tube by high-frequency welding.
Further, as a technique for integrally molding a tube having a diaphragm by injection molding, there is Japanese Patent Application No. 61-235298 filed by the present applicant. This technology is the 10th
An injection mold as shown in the figure is used. That is, this injection mold 1 has a tube 4 with a diaphragm.
Female mold 2 for molding the outer wall surface 5a of the tube 5
and two male molds 7 and 8 which mold the inner wall surface 5b of the tube 5 and which are inserted into the female mold 2 from above and below to mold the diaphragm 6 in the space formed between them. It consists of degassing pins 9, 9 that are fitted into the shaft cores of male molds 7, 8, respectively. The female mold 2 is provided with convex portions 10, 10 symmetrically at 180 degrees approximately at the center in the axial direction, and these convex portions 1
Gates 3a and 3b for injecting resin are located at 0 and 10.
They are arranged 180 degrees symmetrically. Furthermore, the film thickness of the diaphragm 6 formed by the tip surfaces 7a, 7b of the two male molds 7, 8 is the same as that of the gates 3a, 3 of the female mold 2.
The wall thickness of the tube 5 formed by the convex portions 10, 10 around b and the circumferential surfaces of the male molds 7, 8 is smaller than that of the tube 5. Therefore, the gates 3a, 3 provided 180 degrees symmetrically in the female mold 2 of this injection mold 1
When resin is injected from b, the resin first starts to be injected into the diaphragm 6 side and then into the tube 5 side. The resin injected into the diaphragm 6 side flows in while facing each other, and comes into contact with the gates 3a and 3b in a straight line at approximately equal positions to form the diaphragm 6, and also forms the diaphragm 6.
The resin also flows into the end of the tube 5 to mold the tube 5, and as a result, the tube 4 with a diaphragm is injection molded. [Problems to be solved by the invention] However, in the conventional method as described above, the steps for manufacturing a tube with a diaphragm are many and complicated, resulting in low productivity and difficulty in improving manufacturing capacity, resulting in high cost. It also becomes more expensive. Also, since it is not integrally molded, pinholes are likely to occur, and
There are problems such as the thickness of the diaphragm is not uniform. Further, in the method, the gate 3a of the female mold 2,
The resin injected from gate 3b to the diaphragm 6 side is injected while facing each other and comes into contact with the gates 3a and 3b in a straight line at approximately equal positions, but in this process, the gas compressed by the resin is It is ejected from between the punching pins 9, 9 and the male molds 7, 8. but,
Since the gas venting pins 9, 9 have a cylindrical integral structure, the compressed gas flows to the point where the periphery of the cylindrical gas venting pins 9, 9 intersects with the straight line formed by the above-mentioned resin coming into contact with each other. As the gas eventually begins to escape, gas escape becomes insufficient and pinholes are likely to occur. The present invention has been made in view of the above circumstances, and provides a method for manufacturing a tube having a simple manufacturing process, high productivity, and low cost, and having a diaphragm without pinholes. The purpose is to [Means for Solving the Problems] In order to solve the above problems, the method for manufacturing a tube having a diaphragm according to the present invention is used to mold the outer wall surface of the tube, and the tubes are located opposite to each other, and a female mold each provided with a gate, used to mold the inner wall surface of the tube, and inserted into the female mold from above and below to mold a diaphragm in the tube; A method for manufacturing a tube having a diaphragm, which is formed by injecting plastic resin through a gate of a female mold into an injection mold consisting of a male mold in which a gas vent pin is inserted in the central axial direction. It's hot,
The gas vent pin inserted into the male mold,
It is configured to be divided at least according to the number of gates, and the dividing positions are set at equal distances from the gates, so that gas during injection molding of the plastic resin is vented from the mating surfaces of the divided bodies. [Function] According to the above configuration, the plastic resin flowing into the diaphragm side from each gate of the female mold advances while facing each other, and flows along the mating surfaces of the divided bodies of the gas vent pin located at the same position from the respective gates. Then, these plastic resins come into contact with each other, and in the process, the gas compressed by the plastic resins completely escapes from the mating surfaces of the divided bodies, and the plastic resins that come into contact mix and completely degas. [Example] Hereinafter, an example of the present invention will be described in detail based on FIGS. 1 to 9. FIG. 1 is a cross-sectional view of an injection mold to which the manufacturing method of the present invention is applied, FIG. 2 is a partially cutaway perspective view of a tube with a diaphragm manufactured by the manufacturing method of the present invention, and FIG. 3 Figure 4 is a partially cutaway perspective view of the male mold of the injection mold.
FIG. 5 is a perspective view of the gas vent pin in the divided state, and FIG. 5 is a perspective view of the gas vent pin in the assembled state. In the figure, 1 indicates an injection mold, and a thermoplastic resin (hereinafter simply referred to as resin) is supplied to the injection mold 1. As this resin, a soft vinyl chloride resin, ethylene-vinyl acetate copolymer, etc. are used. This resin granular material is heated and melted until it becomes a fluid, and this fluid resin is introduced into the mold cavity A under high pressure through the two gates 3a and 3b of the female mold 2 of the injection mold 1. eject. The injection mold 1 used at this time includes the female mold 2 for molding the outer wall surface 5a of the tube 5 of the tube 4 with a diaphragm, and the female mold 2 for molding the inner wall surface 5b of the tube 5, and for molding the female mold 2 in the vertical direction. Two male molds 7 and 8 are inserted into the molds to form the diaphragm 6 between them, and a gas vent pin is inserted into the shaft cores of the male molds 7 and 8, respectively, and is divided into two parts. The female mold 2 and the male molds 7 and 8 define the mold cavity A. The female mold 2 is provided with protrusions 10, 10 symmetrically at 180 degrees approximately at the center in the axial direction. This convex portion 10,
10 includes the gate 3a for injecting the resin;
3b are provided 180 degrees symmetrically. Also, the length l 1 of the tip surfaces 7a and 8a of the two male molds 7 and 8
That is, the film thickness of the diaphragm 6 is the same as that of the protrusions 10, 10 around the gates 3a, 3b of the female mold 2 and the male mold 7,
It is thicker than the length l 2 from the circumferential surface of tube 8, that is, the wall thickness of tube 5 at this position. Therefore, when the resin is injected from the gates 3a and 3b, it first flows between the tip surfaces 7a and 8a of the male molds 7 and 8, where the resistance is low, that is, toward the diaphragm 6 side. In addition, the tip surfaces 7a of the two male molds 7 and 8 mentioned above
The length l 1 between and 8a, that is, the thickness of the diaphragm 6 is:
The thickness is set to be 1 mm or less, so that it can be easily pierced with a piercing needle during use, and the thickness is set to be sufficient in terms of manufacturing and strength. The degassing pin 9 is divided into parts according to the number of gates provided in the female mold 2, and its divided position is set to the gate of the female mold 2 when inserted into the male molds 7 and 8. Since it is necessary to be equidistant from 3a and 3b, the degassing pin 9 is divided into a semicircle, that is, into semicylindrical bodies (divided bodies) 11 and 12, as shown in FIGS. 3 and 4. There is. This gas vent pin 9 is connected to these semi-cylindrical bodies 11 and 12.
L-shaped grooves 11b, 12b are carved along the edges of the mating surfaces 11a, 12a on the distal end side. As shown in FIG. 5, this gas venting pin 9
By aligning 1a and 12a, they become integrated, and a U-shaped groove B is formed. This U-shaped groove B has a width of 0.01mm to 1.0mm and a depth of 0.01mm to 1.0mm.
The width is preferably in the range of 0.1 mm to 0.1 mm.
0.7mm and the depth is in the range of 0.05mm to 0.3mm.
Also, as shown in FIG. 6, this gas vent pin 9 is
In order to form the groove B between the semi-cylindrical bodies 11 and 12, it may be constructed by sandwiching a plate-shaped body 13 which is slightly shorter than the full length of these semi-cylindrical bodies 11 and 12. When the male molds 7 and 8 into which the gas vent pin 9 configured as described above is fitted, when inserted into the female mold 2, the groove B of the gas vent pin 9 is inserted into the female mold 2. It is inserted into the female mold 2 at a position perpendicular to the line connecting the gates 3a and 3b, which are provided 180 degrees symmetrically. Next, 2 of the female mold 2 of the injection mold 1 mentioned above.
The resin injected into the mold cavity A mentioned above at high pressure from the gates 3a and 3b is
The tip surface 7 of the male molds 7, 8 is longer than the length l 2 between the convex portions 10, 10 around b and the circumferential surface of the male molds 7, 8.
Since the length l 1 with a and 8a is longer, as shown in FIG. Then, it flows into the side between the convex portions 10, 10 and the circumferential surfaces of the male molds 7, 8. Then, the tip surfaces 7 of the male molds 7 and 8
As shown in FIG. 8, the resin that has flowed between a and 8a flows from the gates 3a and 3b facing each other, and comes into contact with the gates 3a and 3b in a substantially straight line at substantially the same positions. This straight line of contact overlaps with the grooves B, B of the gas vent pins 9, 9 fitted into the male molds 7, 8. In this process, the gas in the mold cavity A is compressed by the resin, and this compressed gas passes through the grooves B and B to the semi-cylindrical body 1.
It is discharged from the mating surfaces 11a and 12a of Nos. 1 and 12. Therefore, this compressed gas is completely released,
The resins in contact with each other completely mix with each other to form a diaphragm 6 without pinholes. During this time, the convex portion 10,
The resin injected between the circumferential surfaces of the male molds 7 and 8 is also injected into the end of the mold cavity A constituting the tube to form the tube 5, as shown in FIG. After the tube 4 with a diaphragm molded in this manner is cooled, the injection mold 1 is removed and the product is made into a product. Next, sample C was manufactured based on the method of manufacturing a tube having a diaphragm of the present invention shown in FIGS. 1 to 9, and sample E was manufactured based on the method of manufacturing a tube having a conventional diaphragm shown in FIG. A pinhole test was conducted and the results are shown in Table 1.
以上詳述したように、本発明の隔膜を有するチ
ユーブの製造方法は、オス金型に嵌挿されたガス
抜きピンを少なくともゲート数に応じて分割して
構成すると共に、その分割位置をゲートから等距
離とし、その分割体の合せ面から可塑性樹脂を射
出成型する時のガスを抜くようにしたものであ
り、メス金型のゲートから等位置にあるガス抜き
ピンの分割体の合せ面に沿つて、これら可塑性樹
脂が当接し、その過程で可塑性樹脂により圧縮さ
れたガスが、分割体の合せ面から完全に抜け、当
接した可塑性樹脂は混ざり合い完全にガス抜けが
行われる。
従つて、従来例と比較して製造工程が単純とな
るから、生産性を向上させることが可能となり、
低コストを実現することが出来る。又、ガス抜け
を完全に行うことが出来るからピンホールの発生
を完全に防ぐことが出来、更に、完成品のピンホ
ールテストを行いピンホールの有無、すなわち、
不良品を除去する検査が不必要となるから、その
製品の品質管理が容易となり、ひいては低コスト
を実現することが出来るなどの効果がある。
As described in detail above, the method for manufacturing a tube having a diaphragm according to the present invention comprises dividing a gas vent pin fitted into a male mold into at least the number of gates, and adjusting the dividing position from the gate. The gas release pins are placed at equal distances from the mating surfaces of the divided bodies during injection molding of plastic resin, and the gas vent pins are placed at equal positions from the gate of the female mold along the mating surfaces of the divided bodies. Then, these plastic resins come into contact with each other, and in the process, the gas compressed by the plastic resins completely escapes from the mating surfaces of the divided bodies, and the plastic resins that come into contact mix and completely degas. Therefore, the manufacturing process is simpler than the conventional example, making it possible to improve productivity.
Low cost can be achieved. In addition, since gas can be completely vented, the occurrence of pinholes can be completely prevented.Furthermore, the finished product can be pinhole tested to determine the presence or absence of pinholes.
Since there is no need for inspection to remove defective products, the quality control of the products becomes easier, and the cost can be reduced.
第１図乃至第９図は、本発明の実施例を示すも
ので、第１図は、本発明の製造方法を適用する射
出成型金型の断面図、第２図は本発明の製造方法
によつて製造された隔膜付チユーブを一部切欠し
た斜視図、第３図は射出成型金型のオス金型を一
部切欠した斜視図、第４図はオス金型に嵌挿され
る２分割状態のガス抜きピンの斜視図、第５図は
組み立てた状態のガス抜きピンの斜視図、第６図
はガス抜きピンの他の実施例を示す断面図、第７
図乃至第９図は本発明の製造方法を適用する射出
成型金型による隔膜を有する射出成型の状態を示
す説明図、第１０図は従来の製造方法を適用する
第１図と同状の断面図である。
１……射出成型金型、２……メス金型、３ａ，
３ｂ……ゲート、４……隔膜付チユーブ（隔膜を
有するチユーブ）、５……チユーブ、５ａ……外
壁面、５ｂ……内壁面、６……隔膜、７，８……
オス金型、９……ガス抜きピン、１１，１２……
半円柱体（分割体）、１１ａ，１２ａ……合せ面、
１３……板状体（分割体）、Ｂ……溝。
1 to 9 show examples of the present invention. FIG. 1 is a sectional view of an injection mold to which the manufacturing method of the present invention is applied, and FIG. 2 is a cross-sectional view of an injection mold to which the manufacturing method of the present invention is applied. A partially cutaway perspective view of the thus manufactured tube with a diaphragm, FIG. 3 is a partially cutaway perspective view of the male mold of the injection mold, and FIG. 4 is a two-part state in which it is inserted into the male mold. 5 is a perspective view of the gas vent pin in an assembled state, FIG. 6 is a sectional view showing another embodiment of the gas vent pin, and FIG. 7 is a perspective view of the gas vent pin in the assembled state.
9 to 9 are explanatory diagrams showing the state of injection molding having a diaphragm using an injection mold to which the manufacturing method of the present invention is applied, and FIG. 10 is a cross-sectional view similar to FIG. 1 to which the conventional manufacturing method is applied. It is a diagram. 1...Injection mold, 2...Female mold, 3a,
3b...gate, 4...tube with diaphragm (tube with diaphragm), 5...tube, 5a...outer wall surface, 5b...inner wall surface, 6... diaphragm, 7, 8...
Male mold, 9... Gas vent pin, 11, 12...
Semi-cylindrical body (divided body), 11a, 12a... mating surfaces,
13...Plate body (divided body), B...Groove.
Claims (1)
れ、互いに対向する位置にあり、且つそれぞれに
ゲートを設けられたメス金型と、チユーブの内壁
面を成型するために用いられると共に前記メス金
型内に上下方向から挿入して前記チユーブ内に隔
膜を成型するために用いられ、且つガス抜きピン
が中心部軸方向に嵌挿されたオス金型とからなる
射出成型金型に、前記メス金型のゲートを介して
可塑性樹脂を射出して成型する隔膜を有するチユ
ーブの製造方法であつて、前記オス金型に嵌挿さ
れた前記ガス抜きピンを、少なくとも前記ゲート
数に応じて分割して構成すると共にその分割位置
を前記ゲートから等距離とし、その分割体の合せ
面から可塑性樹脂を射出成型する時のガスを抜く
ようにしたことを特徴とする隔膜を有するチユー
ブの製造方法。 ２ 前記ガス抜きピンの前記分割体の合せ面に沿
つて溝を刻設した特許請求の範囲第１項記載の隔
膜を有するチユーブの製造方法。 ３ 前記ガス抜きピンの前記溝はその幅が0.01mm
〜1.0mmで、その深さが0.01mm〜1.0mmの範囲にあ
る特許請求の範囲第１項又は第２項記載の隔膜を
有するチユーブの製造方法。[Claims] 1. A female mold used for molding the outer wall surface of the tube, located at opposing positions and each provided with a gate, and a female mold used for molding the inner wall surface of the tube. and a male mold that is inserted into the female mold from above and below to mold a diaphragm in the tube, and in which a gas vent pin is inserted in the central axial direction. In the method for manufacturing a tube having a diaphragm, the tube is molded by injecting a plastic resin through the gates of the female mold, wherein the gas vent pins inserted into the male mold are inserted into at least the number of gates. A tube having a diaphragm, characterized in that the tube is divided according to the requirements, and the dividing position is set at an equal distance from the gate, so that gas during injection molding of the plastic resin is vented from the mating surfaces of the divided bodies. Production method. 2. The method of manufacturing a tube having a diaphragm according to claim 1, wherein a groove is carved along a mating surface of the divided body of the gas vent pin. 3 The width of the groove of the gas vent pin is 0.01 mm.
1.0 mm and the depth thereof is in the range of 0.01 mm to 1.0 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP30703487A JPH01301219A (en) | 1987-12-04 | 1987-12-04 | Manufacture of tube with diaphragm |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP30703487A JPH01301219A (en) | 1987-12-04 | 1987-12-04 | Manufacture of tube with diaphragm |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01301219A JPH01301219A (en) | 1989-12-05 |
| JPH049651B2 true JPH049651B2 (en) | 1992-02-20 |
Family
ID=17964241
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP30703487A Granted JPH01301219A (en) | 1987-12-04 | 1987-12-04 | Manufacture of tube with diaphragm |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01301219A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2014037880A (en) * | 2012-08-20 | 2014-02-27 | Tigers Polymer Corp | Connector member |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6877974B2 (en) * | 2000-12-22 | 2005-04-12 | Acushnet Company | Split vent pin for injection molding |
| DE102004051744A1 (en) * | 2004-10-23 | 2006-04-27 | Otto Männer Innovation GmbH | Device for producing a tubular body |
| KR100837146B1 (en) * | 2005-06-01 | 2008-06-23 | 태성고무화학주식회사 | Diaphragm injection molding machine for automobile shock absorber and its injection molding method |
-
1987
- 1987-12-04 JP JP30703487A patent/JPH01301219A/en active Granted
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2014037880A (en) * | 2012-08-20 | 2014-02-27 | Tigers Polymer Corp | Connector member |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH01301219A (en) | 1989-12-05 |
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