JP3363993B2 - Method and apparatus for manufacturing synthetic resin molded product - Google Patents
Method and apparatus for manufacturing synthetic resin molded productInfo
- Publication number
- JP3363993B2 JP3363993B2 JP07862594A JP7862594A JP3363993B2 JP 3363993 B2 JP3363993 B2 JP 3363993B2 JP 07862594 A JP07862594 A JP 07862594A JP 7862594 A JP7862594 A JP 7862594A JP 3363993 B2 JP3363993 B2 JP 3363993B2
- Authority
- JP
- Japan
- Prior art keywords
- bubble
- injection
- molded product
- cylinder
- synthetic resin
- 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 - Fee Related
Links
- 238000004519 manufacturing process Methods 0.000 title claims description 18
- 229920003002 synthetic resin Polymers 0.000 title claims description 11
- 239000000057 synthetic resin Substances 0.000 title claims description 11
- 238000000034 method Methods 0.000 title description 15
- 238000002347 injection Methods 0.000 claims description 42
- 239000007924 injection Substances 0.000 claims description 42
- 229920005989 resin Polymers 0.000 claims description 29
- 239000011347 resin Substances 0.000 claims description 29
- 238000001125 extrusion Methods 0.000 claims description 9
- 238000000465 moulding Methods 0.000 claims description 9
- 238000001746 injection moulding Methods 0.000 claims description 8
- 239000011800 void material Substances 0.000 description 21
- 239000012530 fluid Substances 0.000 description 9
- 230000007547 defect Effects 0.000 description 4
- 238000009434 installation Methods 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 3
- 230000000717 retained effect Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- -1 polyethylene Polymers 0.000 description 2
- 230000003014 reinforcing effect Effects 0.000 description 2
- 239000004952 Polyamide Substances 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- 239000004793 Polystyrene Substances 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 229920002647 polyamide Polymers 0.000 description 1
- 239000004417 polycarbonate Substances 0.000 description 1
- 229920000515 polycarbonate Polymers 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 229920000098 polyolefin Polymers 0.000 description 1
- 229920001955 polyphenylene ether Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 229920002223 polystyrene Polymers 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
- 229920002725 thermoplastic elastomer Polymers 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/1703—Introducing an auxiliary fluid into the mould
- B29C45/1734—Nozzles therefor
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)
Description
【０００１】[0001]
【産業上の利用分野】本発明はボス部、脚部など局部的
に厚肉部を有する合成樹脂射出成形品の製造方法及びそ
のため製造装置であり、詳しくは該局部的厚肉部内に気
泡を注入してボイド部を形成することにより成形品表面
にヒケ、ソリなどの欠陥が現われるのを防止するととも
に、成形品表面にボイド形成用の器具の進入跡も残らな
いようにした改善された合成樹脂射出成形品の製造方法
及びそのための製造装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a synthetic resin injection-molded article having a locally thick portion such as a boss portion and a leg portion, and a manufacturing apparatus therefor. Improving synthesis that prevents defects such as sink marks and warpage from appearing on the surface of the molded product by forming voids by injecting it and also does not leave a trace of entry of a tool for void formation on the surface of the molded product The present invention relates to a method for manufacturing a resin injection molded product and a manufacturing apparatus therefor.
【０００２】[0002]
【従来の技術】従来、補強用リブ等の厚肉部が巡る成形
品の射出成形法においては、ゲート部から延びる該厚肉
部内の溶融樹脂中にガスの通路が形成されるようにガス
を注入、加圧して、該厚肉部の溶融樹脂が冷却・固化す
る際の収縮による表面ヒケなどの欠陥の発生を防止する
ことが行われている。また、成形品のボス部や脚部ある
いは部分的リブなど局部的に厚肉部となる成形品の射出
成形法においては、ＰＦＰ（パーシャル・フレーム・プ
ロセス）成形法により成形品表面にヒケが発生するのを
防止している。後者の方法は要するに樹脂が溶融状態に
ある局部的厚肉部の内部に数ｋｇ／ｃｍ2〜１０数ｋｇ
／ｃｍ2の圧力のガス（気泡）を注入してボイド核を発
生させ、このボイド核を膨張させて樹脂の外側に（キャ
ビティ側に）押しつけることでヒケを防止しようとする
ものである〔型技術、第８巻第４号（１９９３年３月臨
時増刊号）９９〜１０１頁〔ＰＦＰ（パーシャル・フレ
ーム・プロセス）工法による金型製作技術」〕。この方
法は前記のガス注入射出成形法のような大がかりな高圧
設備は不要で、精々２０ｋｇ／ｃｍ2程度の能力をもつ
コンプレッサーで十分であり、又、ＰＦＰではガスチャ
ンネルを形成せずに、局在する複数の厚肉部のうちとく
にヒケを防止したい部分のみを任意選択的に処置するこ
とも可能であるなどの特徴を有している。2. Description of the Related Art Conventionally, in an injection molding method of a molded product having a thick portion such as a reinforcing rib, a gas is formed so that a gas passage is formed in a molten resin in the thick portion extending from a gate portion. Injection and pressurization are performed to prevent the occurrence of defects such as surface sink due to contraction when the molten resin in the thick portion is cooled and solidified. Also, in the injection molding method of a molded product that locally becomes a thick part such as a boss portion, a leg portion or a partial rib of the molded product, a sink mark occurs on the surface of the molded product by the PFP (partial frame process) molding method. To prevent it. The latter method is essentially several kg / cm 2 to several tens of kg inside the locally thick wall where the resin is in a molten state.
It is intended to prevent sink marks by injecting gas (air bubbles) with a pressure of / cm 2 to generate void nuclei and expanding the void nuclei to press them to the outside of the resin (toward the cavity side) [mold Technology, Vol.8, No.4 (Temporary Special Issue, March 1993), pp. 99-101 [Piece Molding Technology by PFP (Partial Frame Process) Method]. This method does not require large-scale high-pressure equipment such as the above-mentioned gas injection injection molding method, and a compressor having a capacity of at most about 20 kg / cm 2 is sufficient, and the PFP does not form a gas channel, so It has a feature that it is possible to optionally treat only a portion of a plurality of existing thick portions where it is desired to prevent sink marks.
【０００３】[0003]
【発明が解決しようとする課題】しかしながら、従来の
ＰＦＰ成形法では、厚肉部にボイド核を形成するのに使
用するボイドピン設置部の跡が成形品表面に残るという
問題がある。この部分が使用者の目に触れる部分である
場合は見栄えを悪化させる。また使用者の目に触れない
部分に生じる場合であっても、例えばテーブルの脚部の
裏面にボイドピン設置跡の凹部が形成されるとフロアを
傷つけるなどといった問題も生じる。本発明はこうした
実情の下に、ボス部、脚部などの柱状部など局部的厚肉
部を有する成形品の表面にヒケなどの欠陥がなく、かつ
ボイドピンの設置跡なども残らない優れた成形品表面を
有する射出成形品の製造方法及びそのための製造装置を
提供することを目的とするものである。However, the conventional PFP molding method has a problem that a mark of a void pin installation portion used for forming a void nucleus in a thick portion remains on the surface of the molded product. If this part is a part that the user can see, it will deteriorate the appearance. Further, even when it occurs in a portion that is not visible to the user, there is a problem that, for example, if a recessed portion of a void pin installation mark is formed on the back surface of the leg portion of the table, the floor is damaged. Under such circumstances, the present invention is an excellent molding in which there is no defect such as a sink mark on the surface of a molded product having a locally thick portion such as a columnar portion such as a boss portion or a leg portion, and a void pin installation mark does not remain. An object of the present invention is to provide a method for manufacturing an injection-molded product having a product surface and a manufacturing apparatus therefor.
【０００４】[0004]
【課題を解決するための手段】本発明者は鋭意検討した
結果、成形品の局部的厚肉部内にボイド核を形成するた
めの内部に摺動可能に嵌合された押出杆を備えた気泡注
入シリンダの動きを制御することにより上記課題を解決
し得ることを見出し、本発明に至った。すなわち、本発
明は、（１）局部的厚肉部を有する合成樹脂成形品の射
出成形による製造方法において、局部的厚肉部に対応す
るキャビティ内に気泡注入シリンダを進入させ保持する
第１工程、金型キャビティ内にゲートより溶融樹脂を注
入して射出成形を行う第２工程、溶融状態にある樹脂中
に前記気泡注入シリンダ先端部より気泡を注入する第３
工程、気泡注入後、成形品表面に気泡注入シリンダの進
入跡を残さないように該気泡注入シリンダ先端部を金型
キャビティ表面部位まで後退させる第４工程を含む合成
樹脂成形品の製造方法、（２）内部に摺動自在に嵌合さ
れた押出杆を備えた気泡注入シリンダを配設してなる合
成樹脂射出成形品の製造装置であって、前記気泡注入シ
リンダは、合成樹脂成形品の局部的厚肉部に対応するキ
ャビティ内部に進入・保持された位置と、キャビティ内
に樹脂射出後前記押出杆により溶融樹脂内部に気泡を押
出し注入した後、後退するキャビティ表面位置との間を
進退動するように配設された合成樹脂射出成形品の製造
装置をその要旨とするものである。DISCLOSURE OF THE INVENTION As a result of intensive studies by the present inventor, a bubble provided with an extruding rod slidably fitted therein for forming a void nucleus in a locally thick portion of a molded article. The present invention has been completed by finding that the above problems can be solved by controlling the movement of the injection cylinder. That is, the present invention provides (1) a first step of injecting and retaining a bubble injection cylinder into a cavity corresponding to a locally thick portion in a method of manufacturing a synthetic resin molded article having a locally thick portion by injection molding. A second step of injecting a molten resin from a gate into a mold cavity for injection molding; a third step of injecting bubbles into the molten resin from the tip of the bubble injecting cylinder
After the step of injecting bubbles, a method for producing a synthetic resin molded article, including a fourth step of retracting the tip of the bubble injecting cylinder to the mold cavity surface site so as not to leave an entry mark of the bubble injecting cylinder on the surface of the article, ( 2) A manufacturing apparatus for a synthetic resin injection-molded product, comprising a bubble-injection cylinder provided with an extrusion rod slidably fitted therein, wherein the bubble-injection cylinder is a local part of the synthetic resin-molded product. Moves back and forth between the position where it enters and is retained inside the cavity corresponding to the thick part, and the position where the cavity surface retreats after the resin is injected into the cavity and the bubbles are extruded and injected inside the molten resin by the extrusion rod. The gist of the invention is an apparatus for manufacturing a synthetic resin injection-molded product arranged as described above.
【０００５】本発明の射出成形品の製造方法及びそのた
めの製造装置は、ボイド核を形成するための構造が重要
であって、その他の手段条件については特に制限はな
く、一般の合成樹脂の射出成形法と同様である。例えば
金型キャビティ内への樹脂の射出は、ボイド核を形成す
る手段とは独立したゲート部を通して行われる。また、
原料樹脂としては、一般的な射出成形品用のポリエチレ
ン、ポリプロピレンなどのポリオレフィン、ポリスチレ
ン、ポリエステル、ポリアミド、ポリカーボネート、Ａ
ＢＳ、ポリフェニレンエーテル、熱可塑性エラストマー
樹脂などが使用できる。本発明に使用される成形品の局
部的厚肉部内にボイド核となる気泡を注入するための気
泡注入シリンダは、ＰＦＰ法においてはボイドピンと呼
称されるものに対応するものである。この気泡注入シリ
ンダは、その内部に前記ボイド核となる気泡を注入する
ことを可能とするように押出杆が摺動自在に嵌合されて
いる。また、気泡注入シリンダは押出杆とともに、成形
品の局部的厚肉部に対応するキャビティ内部とキャビテ
ィ表面部位との間を進退するように配設される。この進
退運動は、例えば直列に配設された第１流体シリンダと
第２流体シリンダ内に備えた制御機構により作動する。In the method for producing an injection-molded article and the apparatus for producing the same according to the present invention, the structure for forming void nuclei is important, and other means and conditions are not particularly limited. It is similar to the molding method. For example, the injection of the resin into the mold cavity is performed through a gate portion independent of the means for forming void nuclei. Also,
As the raw material resin, for general injection molding products, polyolefin such as polyethylene and polypropylene, polystyrene, polyester, polyamide, polycarbonate, A
BS, polyphenylene ether, thermoplastic elastomer resin, etc. can be used. The bubble injecting cylinder for injecting bubbles that become void nuclei into the locally thick portion of the molded product used in the present invention corresponds to what is called a void pin in the PFP method. In this bubble injection cylinder, an extrusion rod is slidably fitted into the bubble injection cylinder so as to allow injection of the air bubbles which will be the void nuclei. Further, the bubble injection cylinder is arranged so as to advance and retract between the inside of the cavity corresponding to the locally thick portion of the molded product and the cavity surface portion together with the pushing rod. This forward / backward movement is operated by, for example, a control mechanism provided in the first fluid cylinder and the second fluid cylinder arranged in series.
【０００６】この機構を例に挙げて説明すると、第１流
体シリンダ内には第１ピストンが、第２流体シリンダ内
には第２ピストンが備えられ、前記の気泡注入シリンダ
は第１ピストンに、また前記押出杆は第１シリンダを通
って第２ピストンにそれぞれ固定され、各ピストンはそ
れぞれのシリンダ内に流体を注入・排出するポンプなど
の機構により所定の運動が行われるようにされる。本発
明においては、まず、成形品の局部的厚肉部に対応する
キャビティ内に気泡注入シリンダを進入保持させ、この
状態において金型キャビティ内へゲートより溶融樹脂を
射出し、次いで該シリンダ内の押出杆をシリンダ先端部
に向けて進めてシリンダ内に保持していた空気を溶融樹
脂中に押出して注入する。この押出杆の作用により局部
的厚肉部内にボイド核を形成した後、気泡注入シリンダ
はその内部の押出杆とともにキャビティ表面まで後退す
る。こうした気泡注入シリンダと押出杆の作動は、例え
ば前記の制御機構により容易に確実に行うことができ
る。注入された気泡であるボイド核の成長によって成形
品の厚肉部表面にヒケの発生が防止され、さらに気泡注
入シリンダの進入跡も溶融樹脂によって補填され、成形
後の成形品表面にはその進入跡は残らない。かくして本
発明によれば外観に欠陥のない成形品を得ることができ
る。本発明はボス部、脚部、部分補強用リブなどの局部
的に厚肉部を有する成形品の製造に適用することができ
る。Explaining this mechanism as an example, a first piston is provided in the first fluid cylinder, a second piston is provided in the second fluid cylinder, and the bubble injection cylinder is used as the first piston. The push rod is fixed to the second piston through the first cylinder, and each piston is caused to perform a predetermined movement by a mechanism such as a pump for injecting / exhausting fluid into / from each cylinder. In the present invention, first, the bubble injection cylinder is made to enter and be held in the cavity corresponding to the locally thick portion of the molded product, and in this state, the molten resin is injected from the gate into the mold cavity, and then the inside of the cylinder The extruding rod is advanced toward the tip of the cylinder, and the air retained in the cylinder is extruded and injected into the molten resin. After the void nuclei are formed in the locally thick portion by the action of the pushing rod, the bubble injection cylinder retracts to the cavity surface together with the pushing rod inside the void nuclei. The operation of the bubble injection cylinder and the pushing rod can be easily and surely performed by, for example, the above-mentioned control mechanism. The growth of void nuclei, which are the injected bubbles, prevents the occurrence of sink marks on the surface of the thick part of the molded product.Furthermore, the trace of the bubble injection cylinder is also filled with molten resin, and it enters the surface of the molded product after molding. No traces remain. Thus, according to the present invention, it is possible to obtain a molded product having no appearance defect. INDUSTRIAL APPLICABILITY The present invention can be applied to the production of a molded product having a locally thick portion such as a boss portion, a leg portion, and a rib for partially reinforcing.
【０００７】[0007]
【実施例】以下に図面に基づき実施例により本発明を更
に詳細に説明する。図１は本発明により製造された成形
品１の一例を示す斜視図である。図２は図１Ａ−Ａ線断
面図で局部的厚肉部２内に気泡の注入により成長したボ
イドからなる中空部４が形成されている。なお、３はゲ
ートを示す。図３〜図６は図１に示す形状の成形品を本
発明により製造する方法及びそのために使用する製造装
置を説明するものである。図３（ａ）は図示しない金型
により形成される局部的厚肉部に対応するキャビティ部
分５に気泡注入シリンダ６を進入、保持させた状態を示
すもので、（ｂ）はその気泡注入シリンダ６の先端部６
−１の拡大図である。図に示すように、先端部６−１は
袋状となっており、かつその中央部には成形時に溶融樹
脂が入らない程度の孔６−２が設けてある。この孔は金
型のガス抜き孔程度のφ０．０５ｍｍ程度のものであ
る。気泡注入シリンダ６の内部には気泡発生のための空
間部６−３を介して、この空間部の空気を溶融樹脂中に
押出し注入する押出杆７が摺動自在に嵌合されている。
この押出杆７と気泡注入シリンダ６の動作は制御機構に
より制御される。この実施例の制御機構は、気泡注入シ
リンダを固定している第１ピストン１０を備えた第１流
体シリンダ８と、押出杆を固定している第２ピストン１
１を備えた第２流体シリンダ９とを直列に配設し、両ピ
ストンを空気、水、油などの流体により作動させるよう
に駆動源１３と接続させてなるものである。また１２は
押出杆７が気泡注入シリンダ内に適宜容量の空間部６−
３を保持するためのバネである。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in more detail with reference to the accompanying drawings. FIG. 1 is a perspective view showing an example of a molded product 1 manufactured according to the present invention. FIG. 2 is a cross-sectional view taken along the line AA of FIG. 1, in which a hollow portion 4 composed of a void grown by injection of bubbles is formed in the locally thick portion 2. In addition, 3 shows a gate. 3 to 6 illustrate a method of manufacturing a molded product having the shape shown in FIG. 1 according to the present invention and a manufacturing apparatus used for the method. FIG. 3A shows a state in which the bubble injection cylinder 6 has entered and retained in the cavity portion 5 corresponding to a locally thick portion formed by a mold not shown, and FIG. 3B shows the bubble injection cylinder. 6 of 6
It is an enlarged view of -1. As shown in the figure, the tip portion 6-1 is in the shape of a bag, and a hole 6-2 is formed in the center thereof so that molten resin does not enter during molding. This hole has a diameter of about 0.05 mm, which is about the same as the gas vent hole of the mold. An extruding rod 7 for extruding and injecting the air in the space into the molten resin is slidably fitted inside the bubble injecting cylinder 6 through a space 6-3 for generating air bubbles.
The operations of the pushing rod 7 and the bubble injection cylinder 6 are controlled by the control mechanism. The control mechanism of this embodiment includes a first fluid cylinder 8 having a first piston 10 fixing a bubble injection cylinder and a second piston 1 fixing an extrusion rod.
The second fluid cylinder 9 provided with 1 is arranged in series, and both pistons are connected to the drive source 13 so as to be operated by a fluid such as air, water, or oil. Further, 12 is an extrusion rod 7 in which a space portion 6- of an appropriate capacity is provided in the bubble injection cylinder.
It is a spring for holding 3.
【０００８】図４〜６は前記制御機構の作動状況を説明
するものである。図４は、樹脂１４が気泡注入シリンダ
が保持されているキャビティ内部に注入された状態を示
すもので、図５は駆動源１３を作動させて第２流体シリ
ンダの第２ピストンを進めて、押出杆７を気泡注入シリ
ンダ６の先端部に向けて作動させ空間部に存在する空気
を溶融樹脂中に押出し注入する。次いで図６に示すよう
に、気泡注入シリンダ６は、気泡注入後、押出杆ととも
に後退し、その先端部がキャビティ表面１５で保持され
る。注入された気泡により形成されたボイド核４は周囲
の溶融樹脂から加熱されて成長し（膨張し）、中空部４
となる。このボイドの成長に伴い溶融樹脂９は内部から
金型表面に向かって押し付けられるので、局部的な厚肉
部にはヒケは発生せず、また気泡注入シリンダの後退に
つれてその進入跡も樹脂により補填されるので成形品表
面に凹部として残ることもない。成形終了後、型開きし
て成形品が金型キャビティから取出され、再び図３の状
態にもどり、上記の動作が繰返される。別の実施例とし
て、気泡注入シリンダーにヒーターを組合せ樹脂の流れ
を向上させることもできる。4 to 6 explain the operating condition of the control mechanism. FIG. 4 shows a state in which the resin 14 is injected into the cavity in which the bubble injection cylinder is held, and FIG. 5 operates the drive source 13 to advance the second piston of the second fluid cylinder and push it out. The rod 7 is operated toward the tip of the bubble injection cylinder 6 to extrude and inject the air existing in the space into the molten resin. Next, as shown in FIG. 6, after the bubble injection, the bubble injection cylinder 6 is retracted together with the extrusion rod, and its tip is held by the cavity surface 15. The void nuclei 4 formed by the injected bubbles are heated from the surrounding molten resin to grow (expand), and the hollow portion 4
Becomes As the voids grow, the molten resin 9 is pressed from the inside toward the mold surface, so that no sink mark is generated in the locally thick portion, and as the bubble injection cylinder retreats, the entry mark is also filled with resin. Therefore, it does not remain as a recess on the surface of the molded product. After the molding is completed, the mold is opened, the molded product is taken out from the mold cavity, the state shown in FIG. 3 is restored again, and the above operation is repeated. As another example, a heater may be combined with a bubble injection cylinder to improve the flow of resin.
【０００９】[0009]
【発明の効果】以上説明したように、本発明はヒケの防
止法として知られる従来の高圧を使用してゲートから通
じる成形品の厚肉部内にガス通路を形成しながら保圧す
るガス注入射出成形法のような大がかりな設備を要せ
ず、金型の改良により容易に対応が可能である。また、
従来のＰＦＰ法のように厚肉部内にボイド核を形成する
ために使用されるボイドピンの設置跡が残らないため、
それをケアするための二次加工も要せずに、外観に特に
優れた成形品を得ることができる。また、本発明は気泡
注入シリンダーのキャビティ内への進入ストロークは容
易に調整が可能であり、成形品の局部的厚肉部の形状に
最適なボイド核の注入、中空部の形成を容易に行うこと
ができる。As described above, according to the present invention, the conventional high pressure known as a sink preventing method is used to form a gas passage in the thick portion of the molded product which is communicated from the gate and to maintain the pressure while injecting gas. It does not require large-scale equipment such as the law, and can be easily handled by improving the mold. Also,
Unlike the conventional PFP method, since there are no traces of the installation of void pins used to form void nuclei in the thick portion,
It is possible to obtain a molded product having a particularly excellent appearance without requiring secondary processing for caring for it. Further, according to the present invention, the entry stroke into the cavity of the bubble injecting cylinder can be easily adjusted, and the injection of void nuclei and the formation of the hollow portion that are optimal for the shape of the locally thick portion of the molded product can be easily performed. be able to.
【図１】本発明により製造された成形品の一例を示す斜
視図、FIG. 1 is a perspective view showing an example of a molded product manufactured according to the present invention,
【図２】図１Ａ−Ａ線断面図、FIG. 2 is a sectional view taken along line AA of FIG.
【図３】ａはキャビティ内に気泡注入シリンダを進入・
保持させた状態を示す説明図、ｂは気泡注入シリンダー
先端部の拡大説明図、[Fig. 3] a shows the bubble injection cylinder entering the cavity.
Explanatory diagram showing the state of holding, b is an enlarged explanatory diagram of the bubble injection cylinder tip portion,
【図４】樹脂１４がキャビティ内に注入された状態を示
す説明図、FIG. 4 is an explanatory view showing a state where resin 14 is injected into the cavity,
【図５】押出杆により気泡注入シリンダーから気泡を溶
融樹脂中に注入した状態を示す説明図、FIG. 5 is an explanatory view showing a state where bubbles are injected into a molten resin from a bubble injection cylinder by an extrusion rod.
【図６】気泡注入シリンダーがキャビティ表面まで後退
した状態を示す図。FIG. 6 is a view showing a state in which the bubble injection cylinder is retracted to the cavity surface.
５ キャビティ ６ 気泡注入シリンダー ７ 押出杆 5 cavities 6 Bubble injection cylinder 7 Extruding rod
───────────────────────────────────────────────────── フロントページの続き (58)調査した分野(Int.Cl.7，ＤＢ名) B29C 45/00 - 45/84 ─────────────────────────────────────────────────── ─── Continuation of the front page (58) Fields surveyed (Int.Cl. 7 , DB name) B29C 45/00-45/84
Claims (2)
射出成形による製造方法において、局部的厚肉部に対応
するキャビティ内に気泡注入シリンダを進入させ保持す
る第１工程、金型キャビティ内にゲートより溶融樹脂を
注入して射出成形を行う第２工程、溶融状態にある樹脂
中に前記気泡注入シリンダ先端部より気泡を注入する第
３工程、気泡注入後、成形品表面に気泡注入シリンダの
進入跡を残さないように該気泡注入シリンダ先端部を金
型キャビティ表面部位まで後退させる第４工程を含むこ
とを特徴とする合成樹脂成形品の製造方法。1. A method of manufacturing a synthetic resin molded article having a locally thick portion by injection molding, the first step of causing a bubble injection cylinder to enter and hold the cavity corresponding to the locally thick portion, a mold cavity. The second step of injecting the molten resin from the gate to perform injection molding, the third step of injecting the bubbles into the molten resin from the tip of the bubble injection cylinder, and the bubble injection to the surface of the molded product after the bubble injection A method for producing a synthetic resin molded article, which comprises a fourth step of retracting the tip of the bubble injection cylinder to the surface of the mold cavity so as not to leave an entry mark of the cylinder.
えた気泡注入シリンダを配設してなる合成樹脂射出成形
品の製造装置であって、前記気泡注入シリンダは、合成
樹脂成形品の局部的厚肉部に対応するキャビティ内部に
進入・保持された位置と、キャビティ内に樹脂射出後前
記押出杆により溶融樹脂内部に気泡を押出し注入した
後、後退するキャビティ表面位置との間を進退動するよ
うに配設されたことを特徴とする合成樹脂射出成形品の
製造装置。2. An apparatus for producing a synthetic resin injection-molded product, comprising a bubble-injection cylinder having an extrusion rod slidably fitted therein, wherein the bubble-injection cylinder is a synthetic resin molding. Between the position where the inside of the cavity corresponding to the locally thick part of the product is held, and the position where the cavity surface retreats after the resin is injected into the cavity and the bubbles are extruded and injected into the molten resin by the extrusion rod. An apparatus for manufacturing a synthetic resin injection-molded article, characterized in that it is arranged so as to move back and forth.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP07862594A JP3363993B2 (en) | 1994-04-18 | 1994-04-18 | Method and apparatus for manufacturing synthetic resin molded product |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP07862594A JP3363993B2 (en) | 1994-04-18 | 1994-04-18 | Method and apparatus for manufacturing synthetic resin molded product |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH07285142A JPH07285142A (en) | 1995-10-31 |
| JP3363993B2 true JP3363993B2 (en) | 2003-01-08 |
Family
ID=13667071
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP07862594A Expired - Fee Related JP3363993B2 (en) | 1994-04-18 | 1994-04-18 | Method and apparatus for manufacturing synthetic resin molded product |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3363993B2 (en) |
-
1994
- 1994-04-18 JP JP07862594A patent/JP3363993B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH07285142A (en) | 1995-10-31 |
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