JPH0857904A - Manufacture of injection molded product - Google Patents

Manufacture of injection molded product

Info

Publication number
JPH0857904A
JPH0857904A JP22551294A JP22551294A JPH0857904A JP H0857904 A JPH0857904 A JP H0857904A JP 22551294 A JP22551294 A JP 22551294A JP 22551294 A JP22551294 A JP 22551294A JP H0857904 A JPH0857904 A JP H0857904A
Authority
JP
Japan
Prior art keywords
cavity
molten material
gate
injected
gate valve
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.)
Pending
Application number
JP22551294A
Other languages
Japanese (ja)
Inventor
Yukiyasu Nagata
幸康 永田
Masahiro Sakai
正裕 堺
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Inoac Corp
Original Assignee
Inoue MTP KK
Inoac Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Inoue MTP KK, Inoac Corp filed Critical Inoue MTP KK
Priority to JP22551294A priority Critical patent/JPH0857904A/en
Publication of JPH0857904A publication Critical patent/JPH0857904A/en
Pending legal-status Critical Current

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
    • B29C45/0025—Preventing defects on the moulded article, e.g. weld lines, shrinkage marks
    • 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
    • B29C45/0025—Preventing defects on the moulded article, e.g. weld lines, shrinkage marks
    • B29C2045/0032—Preventing defects on the moulded article, e.g. weld lines, shrinkage marks sequential injection from multiple gates, e.g. to avoid weld lines

Abstract

PURPOSE: To realize manufacture of a molded product which is free from occurrence of inferiority in molding such as a weld line, sink, etc., and when it passes through the cavity and passes in front of another gate, the molten material is started to be injected into the cavity from the other gates. CONSTITUTION: A gate valve 1A provided at one end part of a cavity C when molding is started, and molten material L1 plasticized by heating raw material is injected into the cavity C therefrom. The injected molten material L1 flows to the other end in the cavity C, and passes in front of a gate valve 1B. Then, when the molten material L1 passes in front of the gate valve 1B, the gate valve 1B is opened, new molten material L2 is injected. At that time, the molten material L1 is continuously supplied without being stopped. When the gate valve 1A is closed, injection pressure of the molten material L2 appears directly on a gate surface, a trouble of making a weld line is generated.

Description

【発明の詳細な説明】Detailed Description of the Invention

【０００１】[0001]

【産業上の利用分野】本発明は射出成形品の製造方法に
関し、特に、薄肉大型の射出成形品をウエルドラインや
ヒケ等の製品欠陥を生じさせることなく製造することが
できる製造方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing an injection molded product, and more particularly to a method for manufacturing a thin and large injection molded product without causing product defects such as weld lines and sink marks.

【０００２】[0002]

【従来の技術】自動車のサイドプロテクターモール等の
帯状に延びる長尺物は、従来、押し出し成形法に依って
いたが、近年の表面模様の意匠性向上や軽量化等の要請
から、射出成形法による製造が多用されるようになって
いる。長尺射出成形品の製造方法としては、キャビティ
の一端にゲートを設けて溶融材料を射出するのが一般的
である。2. Description of the Related Art Conventionally, a belt-shaped elongated object such as a side protector molding of an automobile has been conventionally manufactured by an extrusion molding method. However, in recent years, an injection molding method is used in order to improve the design of a surface pattern and reduce the weight. The manufacturing by is becoming popular. As a method for producing a long injection-molded product, it is general to provide a gate at one end of a cavity and inject the molten material.

【０００３】[0003]

【発明が解決しようとする課題】しかるに、上記製法で
は、樹脂等の溶融材料がキャビティの他端へ流れるまで
の間に冷却固化するため、成形できる製品長さに限度が
あり、また、キャビティ他端部では樹脂圧が不足してヒ
ケ等が起こり易かった。もちろん、製品を厚肉化すれ
ば、ヒケの発生を抑え、ある程度の製品長さの延長も可
能であるが、製品重量の増大とコスト高を招くことにな
った。そこで、図７に示すごとく、型２，３内に形成さ
れたキャビティＣの長手方向へ間隔をおいて、ランナー
４１から多数（図は３つ）のゲート４２を開口させ、こ
れら各ゲート４２から同時に溶融材料を射出する多点ゲ
ート方式が採られるようになった。しかし、斯る方式に
よれば、図８の矢印で示すように、各ゲート４２からキ
ャビティＣ内へ同時に射出されて左右へ分流した溶融材
料が途中で正面衝突して、この衝突部にウエルドライン
Ｗを多発させる不具合を招いた。尚、キャビティの中央
にフィルムゲートを開口させて溶融材料をシート状に射
出する方法もあるが、これによるとゲートの両端縁で製
品にウエルドラインが生じ易く、また、ゲートがセンタ
ーに位置し製品に反りが出易かった。However, in the above manufacturing method, since the molten material such as resin is cooled and solidified before flowing to the other end of the cavity, there is a limit to the length of the product that can be molded. At the edges, the resin pressure was insufficient, and sink marks were likely to occur. Of course, if the product is made thicker, the occurrence of sink marks can be suppressed and the product length can be extended to some extent, but this results in an increase in product weight and an increase in cost. Therefore, as shown in FIG. 7, a large number (three in the figure) of gates 42 are opened from the runner 41 at intervals in the longitudinal direction of the cavities C formed in the molds 2 and 3, and each of these gates 42 is opened. At the same time, a multi-point gate method for injecting molten material has come to be adopted. However, according to such a method, as shown by the arrow in FIG. 8, the molten material that is simultaneously injected into the cavity C from each gate 42 and shunts to the left and right, collides head-on in the middle, and the weld line enters the collision part. It caused a problem that W was frequently generated. There is also a method in which a film gate is opened in the center of the cavity to inject the molten material into a sheet, but this method tends to cause weld lines in the product at both edges of the gate, and the gate is located at the center. It was easy to warp.

【０００４】本発明は上記問題点を解決するもので、ウ
エルドラインやヒケ等の成形不良がでない射出成形品の
製造方法を提供することを目的とする。The present invention solves the above problems, and an object of the present invention is to provide a method for producing an injection-molded article free from molding defects such as weld lines and sink marks.

【０００５】[0005]

【課題を解決するための手段】本第一発明の射出成形品
の製造方法は、キャビティに臨んで設けた複数のゲート
の一つからキャビティ内へ溶融材料を注入し、溶融材料
がキャビティ内を流れて他のゲート前を通過した時に、
当該他のゲートからもキャビティ内へ溶融材料の注入を
開始するようにしたことを特徴とする。本第二発明の射
出成形品の製造方法では、複数のゲートが長尺状キャビ
ティの長手方向へ間隔をおいて設けられ、キャビティの
一端に位置する上記一のゲートからキャビティ内へ溶融
材料を注入し、溶融材料がキャビティ内を長手方向へ流
れて、残る他のゲート前を通過する毎に、順次、当該他
のゲートからキャビティ内へ溶融材料の注入を開始する
ことを特徴とする。そして、本第三発明の構成は、キャ
ビティに臨んで設けた複数のゲートの一つからキャビテ
ィ内へ溶融材料を注入した後、上記他のゲートについて
それぞれ予め定めた所定時間経過後に他の各ゲートから
キャビティ内へ溶融材料の注入を開始することを特徴と
する。In the method for manufacturing an injection-molded article according to the first aspect of the present invention, a molten material is injected into the cavity from one of a plurality of gates provided facing the cavity, and the molten material flows inside the cavity. When flowing and passing in front of another gate,
It is characterized in that the injection of the molten material into the cavity is started also from the other gate. In the method for manufacturing an injection-molded product according to the second aspect of the present invention, a plurality of gates are provided at intervals in the longitudinal direction of the elongated cavity, and the molten material is injected into the cavity from the one gate located at one end of the cavity. However, each time the molten material flows in the cavity in the longitudinal direction and passes in front of the remaining other gate, the molten material is sequentially started to be injected into the cavity from the other gate. And, the structure of the third invention is such that, after injecting the molten material into the cavity from one of the plurality of gates provided facing the cavity, each of the other gates after a predetermined time elapses. From the beginning of the injection of the molten material into the cavity.

【０００６】[0006]

【作用】本第一発明の射出成形品の製造方法によれば、
一のゲートからキャビティ内へ注入した溶融材料が他の
ゲート前を通過した時に、当該他のゲートからの注入が
開始されると、当該他のゲートから注入された新たな溶
融材料は、その前を通過する溶融材料に対して正面衝突
することなく側方から合流する。これは、流れ抵抗等に
よって流動性が低下している通過材料を新たな射出圧で
背後から付勢して、再びその流動力を回復するように作
用する。かくして、材料の正面衝突によるウエルドライ
ンの発生を防止すると共に、キャビティの広い範囲に十
分な流動性と流動圧を有して溶融材料が送られることに
なり、ヒケ等の成形不良のない樹脂成形品が得られるよ
うになる。According to the method for producing an injection-molded article of the first aspect of the present invention,
When the molten material injected from one gate into the cavity passes in front of the other gate and the injection from the other gate is started, the new molten material injected from the other gate will be in front of it. The melted material passing through is joined from the side without head-on collision. This acts to urge the passing material, whose fluidity has been reduced due to flow resistance or the like, from behind with a new injection pressure to restore the fluidity again. Thus, it is possible to prevent the generation of weld lines due to the frontal collision of the material, and to send the molten material to the wide area of the cavity with sufficient fluidity and flow pressure, and to perform resin molding without molding defects such as sink marks. Goods will be obtained.

【０００７】本第二発明も、長尺状キャビティの長手方
向へ間隔をおいて設けた各ゲートから、溶融材料がそれ
らゲート前を通過する毎にキャビティ内へ新たな溶融材
料を射出供給するので、ウエルドラインやヒケ等の不具
合はなくなる。Also in the second aspect of the present invention, new molten material is injected and supplied into the cavity from each gate provided at intervals in the longitudinal direction of the elongated cavity every time the molten material passes in front of the gates. , Defects such as weld lines and sink marks disappear.

【０００８】そして、本第三発明の構成によれば、一の
ゲートからの射出開始後の時間を計り、予測される溶融
材料の通過に基づいて適切なタイミングでこれら他のゲ
ートから新たな溶融材料の注入を行うので、他の各ゲー
ト前の溶融材料の通過を直接検出することなく、ウエル
ドライン等のでない成形品が得られるようになる。According to the structure of the third aspect of the present invention, the time after the start of injection from one gate is measured, and new melting is performed from these other gates at an appropriate timing based on the predicted passage of the molten material. Since the material is injected, a molded product having no weld line or the like can be obtained without directly detecting the passage of the molten material in front of each of the other gates.

【０００９】[0009]

【実施例】以下、本発明を実施例に基づいて詳述する。
サイドプロテクターモールの製造方法に適用するもので
ある。図１は本発明の射出成形品の製造方法を実施する
にあたって、多点ゲートを備えるキャビティＣの透視図
を示す。キャビティＣは一端部を狭幅とし、本体部は一
定幅で図略の型内を長尺状に延びている。そして、斯る
キャビティＣの一端部と本体部の中央にそれぞれゲート
バルブ１Ａ，１Ｂが設けてある。尚、以下の説明を簡単
にするためにゲートバルブ１Ａ，１Ｂの数を二つとして
いるが、実用上はキャビティＣの長さ（すなわち成形品
の長さ）に応じて本体部には長手方向へ必要数のゲート
バルブを設ける。DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail based on embodiments.
It is applied to the manufacturing method of the side protector molding. FIG. 1 shows a perspective view of a cavity C provided with a multipoint gate in carrying out the method for manufacturing an injection-molded article according to the present invention. One end of the cavity C has a narrow width, and the main body has a constant width and extends in a long shape in a mold (not shown). Gate valves 1A and 1B are provided at one end of the cavity C and at the center of the main body. Although the number of gate valves 1A and 1B is two for simplification of the following description, in practice, the main body portion has a longitudinal direction depending on the length of the cavity C (that is, the length of the molded product). Install the required number of gate valves.

【００１０】ゲートバルブ１の詳細を図２に示す。キャ
ビティＣに開口するゲート２１を形成した上型２の凹所
２２内に、凹所２２の内壁と一定のクリアランスを有し
てバルブボデー１１が位置している。バルブボデー１１
の中心には上下動自在にニードルピン１２が配設してあ
り、ニードルピン１２が図示の上昇位置にある時に材料
供給路１３が開放されて、溶融材料がゲート２１からキ
ャビティＣ内へ射出される構造である。注入を停止する
場合には、ニードルピン１２を図の鎖線位置へ下降させ
る。The details of the gate valve 1 are shown in FIG. The valve body 11 is located in the recess 22 of the upper mold 2 having the gate 21 opening to the cavity C with a constant clearance from the inner wall of the recess 22. Valve body 11
A needle pin 12 is arranged at the center of the needle so as to be movable up and down. When the needle pin 12 is at the rising position shown in the drawing, the material supply passage 13 is opened, and the molten material is injected from the gate 21 into the cavity C. Structure. To stop the injection, the needle pin 12 is lowered to the position indicated by the chain line in the figure.

【００１１】上記成形機を作用して、射出成形品の製造
方法は次のようにして行われる。まず、成形開始時に
は、図３に示すごとくキャビティＣの一端部に設けたゲ
ートバルブ１Ａを開放して、ここから樹脂原料を加熱し
て可塑化した溶融材料Ｌ１をキャビティＣ内へ注入す
る。注入された溶融材料Ｌ１はキャビティＣ内を他端へ
向けて流れ、ゲートバルブ１Ｂ前を通過する（図４
（１））。そして、上記溶融材料Ｌ１がゲートバルブ１
Ｂ前を通過した時点でゲートバルブ１Ｂが開き、新たな
溶融材料Ｌ２の注入が行われる。（図４（２））。この
とき、溶融材料Ｌ１の供給は止めることなく継続させ
る。ゲートバルブ１Ａを閉じると、溶融材料Ｌ２の射出
圧が直接ゲート面に出てウエルドラインをつくってしま
う不具合を招くからである。The method for producing an injection-molded article by operating the above molding machine is carried out as follows. First, at the start of molding, the gate valve 1A provided at one end of the cavity C is opened as shown in FIG. 3, and the resin material is heated to inject the molten material L1 plasticized into the cavity C. The injected molten material L1 flows in the cavity C toward the other end and passes in front of the gate valve 1B (FIG. 4).
(1)). The molten material L1 is the gate valve 1
The gate valve 1B is opened at the point of time before B, and new molten material L2 is injected. (FIG. 4 (2)). At this time, the supply of the molten material L1 is continued without stopping. This is because when the gate valve 1A is closed, the injection pressure of the molten material L2 directly comes out to the gate surface and creates a weld line.

【００１２】図４は、キャビティＣ内を流れる溶融材料
Ｌ１の温度が比較的高い場合を示している。ゲートバル
ブ１Ｂから新たに射出された溶融材料Ｌ２は、その目前
を通過する溶融材料Ｌ１の背後（成形品の意匠面は図の
下側である）で、溶融材料Ｌ１の流動（図中矢印）を助
けるようにして流れる。従って、流れ抵抗等によって流
動性が低下した溶融材料Ｌ１に再び流動エネルギが付与
され、この溶融材料Ｌ１はキャビティＣの他端へ向けて
力強く流れるようになる。ここで、ゲートバルブ１Ｂ
は、射出口のゲート部分を溶融材料の流出方向に向ける
と、溶融材料に更なる流動力を与えることになり一層好
ましくなる。FIG. 4 shows a case where the temperature of the molten material L1 flowing in the cavity C is relatively high. The molten material L2 newly injected from the gate valve 1B is behind the molten material L1 that passes immediately before it (the design surface of the molded product is the lower side of the figure), and the flow of the molten material L1 (the arrow in the figure). Flow to help. Therefore, the flow energy is applied again to the molten material L1 whose fluidity is lowered due to the flow resistance and the like, and the molten material L1 strongly flows toward the other end of the cavity C. Here, the gate valve 1B
When the gate portion of the injection port is directed toward the outflow direction of the molten material, the molten material is given more flow force, which is more preferable.

【００１３】かくして、溶融材料Ｌ１の流動性が回復
し、距離のあるキャビティＣ内を一端から他端まで材料
Ｌ１が十分な圧力を有して流動するので、大物成形品に
あっても、キャビティＣ空間を狭くして薄肉軽量化を推
し進めることができ、ヒケ等の発生も防止される。ま
た、各ゲートバルブ１Ａ，１Ｂから射出された溶融材料
Ｌ１，Ｌ２同士が正面衝突しないので、ウエルドライン
の成形不良も起こらない。In this way, the fluidity of the molten material L1 is restored, and the material L1 flows from one end to the other end in the cavity C having a distance with sufficient pressure. The C space can be narrowed to reduce the thickness and weight, and the occurrence of sink marks and the like can be prevented. Further, since the molten materials L1 and L2 injected from the respective gate valves 1A and 1B do not collide head-on with each other, defective molding of the weld line does not occur.

【００１４】更に、ゲートバルブ１Ｂから注入される新
たな溶融材料Ｌ２は、その前方をゲートバルブ１Ａから
の溶融材料Ｌ１が流れているため直進を妨げられ、上記
図４に示すごとく意匠面に到達することはない。したが
って、意匠面を形成する材料Ｌ１は一貫して一端部のゲ
ートバルブ１Ａから供給されたものであり、途中で圧
力，温度の急変する材料Ｌ２が意匠面に現れることがな
いので、つやムラ等も生じない。Further, the new molten material L2 injected from the gate valve 1B is prevented from proceeding straight because the molten material L1 from the gate valve 1A flows in front of it, and reaches the design surface as shown in FIG. There is nothing to do. Therefore, the material L1 that forms the design surface is consistently supplied from the gate valve 1A at one end, and the material L2 whose pressure and temperature change suddenly does not appear on the design surface during the process. Does not occur.

【００１５】一方、キャビティＣ内を流れる溶融材料Ｌ
１の温度が低い場合には、ゲートバルブ１Ｂから供給さ
れた新たな溶融材料Ｌ２は、図５に示すごとく、溶融材
料Ｌ１の内部に侵入するが、この場合も意匠面に溶融材
料Ｌ２が現れることはなく、溶融材料Ｌ１の内部でその
流動エネルギ（図の矢印）を増大させるように作用す
る。そして、この場合にも既述したと同様の効果が得ら
れる。On the other hand, the molten material L flowing in the cavity C
When the temperature of 1 is low, the new molten material L2 supplied from the gate valve 1B enters the inside of the molten material L1 as shown in FIG. 5, but in this case also, the molten material L2 appears on the design surface. Nonetheless, it acts to increase its flow energy (arrow in the figure) inside the molten material L1. Also in this case, the same effect as described above can be obtained.

【００１６】ゲートバルブ１Ｂを開放するタイミング
は、材料Ｌ１の通過を直接検出する以外に、材料の種
類，温度等とゲート間距離から予め材料の到達時間を算
出しておくことによって簡易に決定することができる。
例えば、長さ１００６ｍｍ，幅１０８ｍｍ，厚さ２．０
ｍｍのサイドプロテクターモールを変性ポリプロピレン
を溶融材料として製造する場合には、溶融材料の温度を
２２０℃として、図６に示すごとく、ゲートバルブ１Ａ
を開放し、３．２秒経過後にゲートバルブ１Ｂを開放す
る。こうして、直前を溶融材料Ｌ１が通過した時に、タ
イミング良くゲートバルブ１Ｂを開放することができ
る。尚、図６では、ゲートバルブ１Ａを開放した後、保
圧時間を含めて１３秒後に両ゲートバルブ１Ａ，１Ｂを
閉鎖している。The timing of opening the gate valve 1B is determined simply by directly detecting the passage of the material L1 and by calculating the arrival time of the material in advance from the type of material, temperature, etc. and the distance between the gates. be able to.
For example, length 1006mm, width 108mm, thickness 2.0
When the modified polypropylene is used for the mm side protector molding as the molten material, the temperature of the molten material is set to 220 ° C. and the gate valve 1A is set as shown in FIG.
Is opened, and the gate valve 1B is opened after 3.2 seconds. In this way, when the molten material L1 has passed immediately before, the gate valve 1B can be opened in good timing. In FIG. 6, after opening the gate valve 1A, both gate valves 1A and 1B are closed after 13 seconds including the pressure holding time.

【００１７】かくして、長尺の薄物成形品をウエルドラ
インやヒケ等の不良を生じることなく、簡易に製造する
ことができた。本実施例では、特にゲートバルブを使用
して溶融材料の供給及びその停止を制御するようにした
から、材料供給系の経路長を短くでき、射出成形機のノ
ズルから供給される材料の温度低下を回避できた。ま
た、ゲートバルブを閉じることにより即座に材料供給を
停止できるので、ゲート部の材料が冷却固化するまで型
開放できないという問題はなく、製造のサイクルタイム
が向上した。更に、ゲートバルブの採用により、ゲート
部における圧力損失が少なく、この部分での内部歪みも
小さくなるから、小型の成形機を使用することができ、
コスト低減が図られた。Thus, a long thin molded product could be easily manufactured without causing defects such as weld lines and sink marks. In this embodiment, in particular, the gate valve is used to control the supply and stop of the molten material, so that the path length of the material supply system can be shortened and the temperature of the material supplied from the nozzle of the injection molding machine can be lowered. Could be avoided. Further, since the material supply can be stopped immediately by closing the gate valve, there is no problem that the mold cannot be opened until the material in the gate portion is cooled and solidified, and the manufacturing cycle time is improved. Furthermore, by adopting a gate valve, the pressure loss at the gate part is small and the internal strain at this part is also small, so a compact molding machine can be used,
Cost reduction was achieved.

【００１８】尚、本発明においては、前記実施例に示す
ものに限られず、目的，用途等に応じて本発明の範囲で
種々変更できる。例えば、長尺のキャビティに３以上の
ゲートを設け、まず中央のゲートから射出することによ
りキャビティの両端に向う樹脂流を形成後、順次隣接す
るゲートから上記のように射出する等である。本実施例
ではゲートバルブを使用したが、これに限定されるもの
ではなく、ゲートには標準ゲート，オーバーラップゲー
ト，タブゲート等に適用できる。サイドプロテクターモ
ールの他、インストルメントパネル，ドアトリム等の大
物成形品にも応用できる。The present invention is not limited to those shown in the above embodiments, but can be variously modified within the scope of the present invention depending on the purpose, application and the like. For example, three or more gates are provided in a long cavity, and a resin flow toward both ends of the cavity is formed by first injecting from the central gate, and then sequentially injecting from adjacent gates as described above. Although the gate valve is used in this embodiment, the gate valve is not limited to this, and the gate can be applied to a standard gate, an overlap gate, a tab gate, or the like. In addition to the side protector molding, it can also be applied to large molded products such as instrument panels and door trims.

【００１９】[0019]

【発明の効果】以上のごとく、本発明の射出成形品の製
造方法によれば、ウエルドライン等が生じず、歩留り改
善，品質向上に寄与し、とりわけ大型の薄物成形品を造
るうえで優れた効果を発揮する。As described above, according to the method for producing an injection-molded article of the present invention, weld lines are not generated, which contributes to improvement in yield and quality, and is particularly excellent in producing a large-sized thin article. Be effective.

【図面の簡単な説明】[Brief description of drawings]

【図１】本発明の方法を使用する射出成形機キャビティ
の透視図である。1 is a perspective view of an injection molding machine cavity using the method of the present invention. FIG.

【図２】ゲートバルブの縦断面図である。FIG. 2 is a vertical sectional view of a gate valve.

【図３】型内に形成されたキャビティの断面図である。FIG. 3 is a sectional view of a cavity formed in a mold.

【図４】型内に形成されたキャビティの要部拡大断面図
である。FIG. 4 is an enlarged sectional view of a main part of a cavity formed in a mold.

【図５】型内に形成されたキャビティの要部拡大断面図
である。FIG. 5 is an enlarged cross-sectional view of a main part of a cavity formed in a mold.

【図６】ゲートバルブの開閉タイミングを示すタイムチ
ャートである。FIG. 6 is a time chart showing the opening / closing timing of a gate valve.

【図７】多点ゲートを設けたキャビティの断面図であ
る。FIG. 7 is a cross-sectional view of a cavity provided with a multipoint gate.

【図８】多点ゲートを設けたキャビティの要部拡大断面
図である。FIG. 8 is an enlarged sectional view of a main part of a cavity provided with a multipoint gate.

【符号の説明】[Explanation of symbols]

１，１Ａ，１Ｂ ゲートバルブ（ゲート） ２ 上型 ２１ ゲート Ｃ キャビティ Ｌ１，Ｌ２ 溶融材料 1, 1A, 1B Gate valve (gate) 2 Upper mold 21 Gate C Cavity L1, L2 Molten material

Claims (3)

【特許請求の範囲】[Claims] 【請求項１】 キャビティに臨んで設けた複数のゲート
の一つからキャビティ内へ溶融材料を注入し、溶融材料
がキャビティ内を流れて他のゲート前を通過した時に、
当該他のゲートからキャビティ内へ溶融材料の注入を開
始するようにしたことを特徴とする射出成形品の製造方
法。1. A molten material is injected into the cavity from one of a plurality of gates provided facing the cavity, and when the molten material flows in the cavity and passes in front of another gate,
A method for producing an injection-molded article, characterized in that the injection of the molten material is started from the other gate into the cavity. 【請求項２】 複数のゲートが長尺状キャビティの長手
方向へ間隔をおいて設けられ、キャビティの一端に位置
する上記一のゲートからキャビティ内へ溶融材料を注入
し、溶融材料がキャビティ内を長手方向へ流れて、残る
他のゲート前を通過する毎に、順次、当該他のゲートか
らキャビティ内へ溶融材料の注入を開始することを特徴
とする射出成形品の製造方法。2. A plurality of gates are provided at intervals in the longitudinal direction of the elongated cavity, and the molten material is injected into the cavity from the one gate located at one end of the cavity, and the molten material flows through the cavity. A method for manufacturing an injection-molded article, which comprises sequentially injecting a molten material from the other gate into the cavity every time it flows in the longitudinal direction and passes in front of the remaining other gate. 【請求項３】 キャビティに臨んで設けた複数のゲート
の一つからキャビティ内へ溶融材料を注入した後、上記
他のゲートについてそれぞれ予め定めた所定時間経過後
に他の各ゲートからキャビティ内へ溶融材料の注入を開
始することを特徴とする射出成形品の製造方法。3. A molten material is injected into the cavity from one of a plurality of gates provided facing the cavity, and then melted into the cavity from each of the other gates after a predetermined time elapses. A method for producing an injection-molded article, which comprises injecting a material.
JP22551294A 1994-08-28 1994-08-28 Manufacture of injection molded product Pending JPH0857904A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP22551294A JPH0857904A (en) 1994-08-28 1994-08-28 Manufacture of injection molded product

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP22551294A JPH0857904A (en) 1994-08-28 1994-08-28 Manufacture of injection molded product

Publications (1)

Publication Number Publication Date
JPH0857904A true JPH0857904A (en) 1996-03-05

Family

ID=16830485

Family Applications (1)

Application Number Title Priority Date Filing Date
JP22551294A Pending JPH0857904A (en) 1994-08-28 1994-08-28 Manufacture of injection molded product

Country Status (1)

Country Link
JP (1) JPH0857904A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002067095A (en) * 2000-08-28 2002-03-05 Denso Corp Method for molding resin containing long fibers and moldings formed of the resin
JP2006256007A (en) * 2005-03-16 2006-09-28 Teijin Chem Ltd Vehicle sheath material and its manufacturing method
US7732520B2 (en) 2005-03-16 2010-06-08 Teijin Chemicals, Ltd. Resin composition
WO2019048273A1 (en) * 2017-09-05 2019-03-14 Robert Bosch Gmbh Injection moulding process for producing a fan with improved weld line strength

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002067095A (en) * 2000-08-28 2002-03-05 Denso Corp Method for molding resin containing long fibers and moldings formed of the resin
JP2006256007A (en) * 2005-03-16 2006-09-28 Teijin Chem Ltd Vehicle sheath material and its manufacturing method
US7732520B2 (en) 2005-03-16 2010-06-08 Teijin Chemicals, Ltd. Resin composition
JP4705388B2 (en) * 2005-03-16 2011-06-22 帝人化成株式会社 Vehicle exterior material and manufacturing method thereof
WO2019048273A1 (en) * 2017-09-05 2019-03-14 Robert Bosch Gmbh Injection moulding process for producing a fan with improved weld line strength

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