JPH09309126A - Manufacture of hollow molded body - Google Patents
Manufacture of hollow molded bodyInfo
- Publication number
- JPH09309126A JPH09309126A JP12707596A JP12707596A JPH09309126A JP H09309126 A JPH09309126 A JP H09309126A JP 12707596 A JP12707596 A JP 12707596A JP 12707596 A JP12707596 A JP 12707596A JP H09309126 A JPH09309126 A JP H09309126A
- Authority
- JP
- Japan
- Prior art keywords
- cooling medium
- molded body
- injection
- hollow section
- gas
- 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
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
- B29C45/1704—Introducing an auxiliary fluid into the mould the fluid being introduced into the interior of the injected material which is still in a molten state, e.g. for producing hollow articles
- B29C45/1706—Introducing an auxiliary fluid into the mould the fluid being introduced into the interior of the injected material which is still in a molten state, e.g. for producing hollow articles using particular fluids or fluid generating substances
-
- 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
- B29C45/1704—Introducing an auxiliary fluid into the mould the fluid being introduced into the interior of the injected material which is still in a molten state, e.g. for producing hollow articles
-
- 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
- B29C45/1704—Introducing an auxiliary fluid into the mould the fluid being introduced into the interior of the injected material which is still in a molten state, e.g. for producing hollow articles
- B29C45/1705—Introducing an auxiliary fluid into the mould the fluid being introduced into the interior of the injected material which is still in a molten state, e.g. for producing hollow articles using movable mould parts
-
- 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
- B29C45/1704—Introducing an auxiliary fluid into the mould the fluid being introduced into the interior of the injected material which is still in a molten state, e.g. for producing hollow articles
- B29C45/1706—Introducing an auxiliary fluid into the mould the fluid being introduced into the interior of the injected material which is still in a molten state, e.g. for producing hollow articles using particular fluids or fluid generating substances
- B29C2045/1709—Introducing an auxiliary fluid into the mould the fluid being introduced into the interior of the injected material which is still in a molten state, e.g. for producing hollow articles using particular fluids or fluid generating substances using a cooling fluid
-
- 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
- B29C45/1704—Introducing an auxiliary fluid into the mould the fluid being introduced into the interior of the injected material which is still in a molten state, e.g. for producing hollow articles
- B29C2045/1726—Introducing an auxiliary fluid into the mould the fluid being introduced into the interior of the injected material which is still in a molten state, e.g. for producing hollow articles moving the fluid through the hollow using a fluid inlet and a fluid outlet
-
- 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
- B29C45/1704—Introducing an auxiliary fluid into the mould the fluid being introduced into the interior of the injected material which is still in a molten state, e.g. for producing hollow articles
- B29C2045/1729—Introducing an auxiliary fluid into the mould the fluid being introduced into the interior of the injected material which is still in a molten state, e.g. for producing hollow articles fluid venting means
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)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、中空成形体の製造
方法に関し、詳細には、射出成形用金型のキャビティ内
に溶融状態の熱可塑性樹脂を射出し、熱可塑性樹脂内に
ガスを注入して熱可塑性樹脂内に中空部を形成し、中空
部のガスを所定圧に保持する中空成形体の製造方法に関
する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a hollow molded body, and more specifically, a molten thermoplastic resin is injected into a cavity of an injection molding die, and a gas is injected into the thermoplastic resin. Then, the present invention relates to a method for producing a hollow molded body in which a hollow portion is formed in a thermoplastic resin and a gas in the hollow portion is held at a predetermined pressure.
【０００２】[0002]
【従来の技術】従来、例えば、特公昭４８−４１２６４
号公報に記載されているように、射出成形用金型のキャ
ビティ内に溶融状態の熱可塑性樹脂を射出し、熱可塑性
樹脂内にガスを注入して熱可塑性樹脂内に中空部を形成
し、中空部のガスを所定圧に保持する中空成形体の製造
方法が知られている。2. Description of the Related Art Conventionally, for example, Japanese Examined Patent Publication No. 48-41264.
As described in Japanese Patent Publication, a molten thermoplastic resin is injected into the cavity of an injection molding die, gas is injected into the thermoplastic resin to form a hollow portion in the thermoplastic resin, A method for producing a hollow molded body is known in which the gas in the hollow portion is maintained at a predetermined pressure.
【０００３】[0003]
【発明が解決しようとする課題】しかしながら、叙上の
従来の中空成形体の製造方法においては、射出成形用金
型のキャビティ内に射出された溶融状態の熱可塑性樹脂
が冷却固化するまで中空部のガスを所定圧に保持する必
要があり、長時間を要し、生産性の悪いものであり、中
空成形体の肉の厚さが大きいものほどこの欠点が顕著で
あった。However, in the above conventional method for producing a hollow molded body, the hollow portion is formed until the molten thermoplastic resin injected into the cavity of the injection molding die is cooled and solidified. It was necessary to maintain the gas of No. 2 at a predetermined pressure, it took a long time, the productivity was poor, and this defect was more remarkable as the thickness of the hollow molded body was larger.
【０００４】本発明は、従来の、中空成形体の製造方法
における、叙上の問題点に着目してなされたものであっ
て、その目的とするところは、短時間に中空成形体を製
造でき、生産性の良い中空成形体の製造方法を提供する
ことにある。The present invention has been made by paying attention to the above problems in the conventional method for producing a hollow molded article, and the purpose thereof is to produce the hollow molded article in a short time. Another object of the present invention is to provide a method for producing a hollow molded article having good productivity.
【０００５】[0005]
【課題を解決するための手段】上記課題を解決するた
め、請求項１記載の本発明中空成形体の製造方法は、射
出成形用金型のキャビティ内に溶融状態の熱可塑性樹脂
を射出し、熱可塑性樹脂内にガスを注入して熱可塑性樹
脂内に中空部を形成し、中空部のガスを所定圧に保持す
る中空成形体の製造方法において、中空部に冷却媒体を
注入することにより中空成形体を冷却することを特徴と
するものである。In order to solve the above-mentioned problems, the method for producing a hollow molded article according to the present invention is characterized in that a molten thermoplastic resin is injected into a cavity of an injection molding die, In a method for producing a hollow molded body in which a gas is injected into a thermoplastic resin to form a hollow portion in the thermoplastic resin and the gas in the hollow portion is held at a predetermined pressure, a hollow medium is injected by injecting a cooling medium into the hollow portion. It is characterized in that the molded body is cooled.
【０００６】又、請求項２記載の本発明中空成形体の製
造方法は、請求項１記載の中空成形体の製造方法におい
て、熱可塑性樹脂内へのガスの注入部が焼結金属で構成
されていることを特徴とするものである。The method for producing a hollow molded article according to a second aspect of the present invention is the method for producing a hollow molded article according to the first aspect, wherein the gas injection portion into the thermoplastic resin is made of sintered metal. It is characterized by that.
【０００７】本発明において、熱可塑性樹脂としては、
従来、中空成形体の製造に使用されているものがそのま
ま使用できるものであって、特に限定されるものではな
いが、例えば、ポリエチレン、ポリプロピレン、ポリブ
テン、ポリカーボネート、ポリスチレン、ポリカーボネ
ート、ポリエチレン系アイオノマー、エチレン酢酸ビニ
ル共重合体、エチレンアクリル酸エチル共重合体、塩化
ビニル系樹脂、塩素化塩化ビニル系樹脂、フッ化ビニリ
デン系樹脂、ポリテトラフルオロエチレン、ポリフェニ
レンサルファイド、ポリアミド、ポリエーテルエーテル
ケトン、ポリエーテルサルフォン、ポリサルフォン、ア
クリロニトリルブタジェンスチレン共重合体等が使用で
き、又、これらの単独もしくは混合物に必要に応じてガ
ラス繊維、カーボン繊維、ポリイミド繊維等の補強繊
維、タルク、炭酸カルシウム、マイカ等の充填剤、カー
ボンブラック、酸化チタン等の着色剤、ジオクチルフタ
レート、ステアリン酸等の可塑剤が含まれていてもよ
い。In the present invention, as the thermoplastic resin,
Conventionally, those used in the production of hollow molded articles can be used as they are, and are not particularly limited, and examples thereof include polyethylene, polypropylene, polybutene, polycarbonate, polystyrene, polycarbonate, polyethylene ionomer, and ethylene. Vinyl acetate copolymer, ethylene ethyl acrylate copolymer, vinyl chloride resin, chlorinated vinyl chloride resin, vinylidene fluoride resin, polytetrafluoroethylene, polyphenylene sulfide, polyamide, polyether ether ketone, polyether monkey Phon, polysulfone, acrylonitrile butadiene styrene copolymer, etc. can be used, and if necessary, a reinforcing fiber such as glass fiber, carbon fiber, polyimide fiber, talc, carbon dioxide, etc. Siumu, fillers such as mica, carbon black, colorants such as titanium oxide, dioctyl phthalate, may include plasticizers such as stearic acid.
【０００８】本発明において、冷却媒体としては、従来
から熱可塑性樹脂の成形に使用されているものがそのま
ま使用できるものであって、特に限定されるものではな
いが、例えば、水、メチルアルコール、エチルアルコー
ル等の熱可塑性樹脂を劣化しないものであって、人体に
悪影響を与えないものを使用するのが好ましい。In the present invention, as the cooling medium, those conventionally used for molding thermoplastic resins can be used as they are, and are not particularly limited. For example, water, methyl alcohol, It is preferable to use a resin that does not deteriorate the thermoplastic resin such as ethyl alcohol and does not adversely affect the human body.
【０００９】〔作用〕請求項１記載の本発明中空成形体
の製造方法においては、中空部に冷却媒体を注入するこ
とにより中空成形体を冷却するものであるから、中空成
形体を短時間に冷却することができる。[Operation] In the method for producing a hollow molded body according to the first aspect of the present invention, the hollow molded body is cooled by injecting a cooling medium into the hollow portion. Can be cooled.
【００１０】又、請求項２記載の本発明中空成形体の製
造方法においては、熱可塑性樹脂内へのガスの注入部が
焼結金属で構成されているので、ガスの注入部にガスは
通過するが液体の冷却媒体は通過させない微細孔を構成
するのが容易であり、安価である。Further, in the method for manufacturing a hollow molded article according to the present invention, since the gas injection part into the thermoplastic resin is made of sintered metal, the gas passes through the gas injection part. However, it is easy and inexpensive to form fine pores through which a liquid cooling medium does not pass.
【００１１】[0011]
【発明の実施の形態】次に、図面を参照して本発明の実
施の形態を説明する。図１、２は本発明中空成形体の製
造方法の一実施態様を示す断面図である。図１、２にお
いて、１は本発明中空成形体の製造方法に使用する射出
成形用金型、１１は射出成形用金型１の固定型、１２は
射出成形用金型１の移動型、１３は固定型１１と移動型
１２との間に形成されたキャビティ、１１１は固定型１
１に設けられた樹脂注入孔であり、樹脂注入孔１１１か
ら溶融状態の熱可塑性樹脂が注入されるようになってい
る。DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described with reference to the drawings. 1 and 2 are cross-sectional views showing one embodiment of the method for producing a hollow molded body of the present invention. 1 and 2, 1 is an injection molding die used in the method for producing a hollow molded article of the present invention, 11 is a fixed die of the injection molding die 1, 12 is a moving die of the injection molding die 1, 13 Is a cavity formed between the fixed mold 11 and the movable mold 12, and 111 is the fixed mold 1.
1 is a resin injection hole, and a molten thermoplastic resin is injected from the resin injection hole 111.
【００１２】１４は移動型１２に設けられたガス注入及
び排出装置であり、ガス注入及び排出装置１４には図３
に拡大して示すように、先端に全体が焼結金属からなる
注入排出ノズル１４１が設けられ、注入排出ノズル１４
１には微細孔１４２が設けられ、微細孔１４２は口径が
０．０１ｍｍ程度であって空気は通すが液体は通さない
ようにされている。１４３はガス注入及び排出装置１４
に設けられた給排気管である。図１、２に示すように、
注入排出ノズル１４１の先端は常時キャビティ１３内に
突出されている。Reference numeral 14 denotes a gas injection and discharge device provided in the movable die 12, and the gas injection and discharge device 14 is shown in FIG.
As shown in the enlarged view of FIG. 1, an injection / discharge nozzle 141 made entirely of sintered metal is provided at the tip.
1 is provided with a fine hole 142, and the fine hole 142 has a diameter of about 0.01 mm, and is permeable to air but impermeable to liquid. 143 is a gas injection and exhaust device 14
It is a supply and exhaust pipe provided in. As shown in FIGS.
The tip of the injection / discharge nozzle 141 is always projected into the cavity 13.
【００１３】１５は固定型１１と移動型１２との境界部
に設けられた冷却媒体注入装置、１６は固定型１１と移
動型１２との境界部であって冷却媒体注入装置１５とは
相背向する位置に設けられた冷却媒体排出装置である。
冷却媒体注入装置１５及び冷却媒体排出装置１６は相互
に同一の構造であって、図４に拡大して示すように、本
体から前進後退するシリンダーユニット１５１、１６２
が設けられ、シリンダーユニット１５１、１６２の先端
には冷却媒体注入ノズル１５２もしくは冷却媒体排出ノ
ズル１６２が設けられている。Reference numeral 15 is a cooling medium injection device provided at the boundary between the fixed mold 11 and the movable mold 12, and 16 is a boundary between the fixed mold 11 and the movable mold 12, which is opposite to the cooling medium injection device 15. It is a cooling medium discharge device provided in a facing position.
The cooling medium injection device 15 and the cooling medium discharge device 16 have the same structure as each other, and as shown in the enlarged view of FIG.
The cooling medium injection nozzle 152 or the cooling medium discharge nozzle 162 is provided at the tips of the cylinder units 151 and 162.
【００１４】１５３、１６３は冷却媒体注入ノズル１５
２もしくは冷却媒体排出ノズル１６２の周囲に設けられ
たパッキンであり、パッキン１５３、１６３の存在によ
り冷却媒体の漏れを防止できるようになっている。１５
４、１６４は冷却媒体流通管である。Reference numerals 153 and 163 denote cooling medium injection nozzles 15.
2 or a packing provided around the cooling medium discharge nozzle 162, and the presence of the packings 153 and 163 can prevent the leakage of the cooling medium. Fifteen
Reference numerals 4 and 164 are cooling medium flow pipes.
【００１５】１７は固定型１１に設けられた昇降可能な
スライドコアであり、スライドコア１７が下降時にはそ
の先端はキャビティ１３の一部を形成している。Reference numeral 17 denotes a slide core provided on the fixed mold 11 and capable of moving up and down. When the slide core 17 descends, its tip forms a part of the cavity 13.
【００１６】次に、叙上の射出成形用金型１を使用して
本発明方法により中空成形体を製造する態様を説明す
る。Next, a mode for producing a hollow molded article by the method of the present invention using the above-mentioned injection molding die 1 will be described.
【００１７】図１に示すように、固定型１１と移動型１
２とが閉合され、スライドコア１７が下降されていて、
これらによりキャビティ１３が形成されている状態にお
いて、樹脂注入口１１１から溶融状態の熱可塑性樹脂２
をキャビティ１３内に射出充填し、開口周縁にフランジ
部２２が設けられた容器状の成形体２１を成形する。As shown in FIG. 1, a fixed die 11 and a movable die 1
2 is closed, the slide core 17 is lowered,
In the state where the cavity 13 is formed by these, the molten thermoplastic resin 2 is injected from the resin injection port 111.
Is injected and filled into the cavity 13, and a container-shaped molded body 21 having a flange portion 22 provided on the peripheral edge of the opening is molded.
【００１８】次いで、ガス注入及び排出装置１４の給排
気管１４３を図示しない圧縮空気ポンプに接続して注入
排出ノズル１４１から加圧ガスを容器状の成形体２１の
フランジ部２２に注入し、フランジ部２２に中空部２３
を形成する。中空部２３のガス圧を所定圧に保持して容
器状の成形体２１が固化するのを待ち、固化すれば、ガ
ス注入及び排出装置１４の給排気管１４３を圧縮空気ポ
ンプから外して注入排出ノズル１４１から加圧ガスを排
出させる。Next, the air supply / exhaust pipe 143 of the gas injecting / exhausting device 14 is connected to a compressed air pump (not shown) to inject the pressurized gas from the injecting / exhausting nozzle 141 into the flange portion 22 of the container-shaped molded body 21 to form a flange. Hollow part 23 in part 22
To form The gas pressure in the hollow portion 23 is maintained at a predetermined pressure, and the container-shaped molded body 21 is waited for solidification. When solidified, the supply / exhaust pipe 143 of the gas injecting / exhausting device 14 is removed from the compressed air pump to inject and exhaust The pressurized gas is discharged from the nozzle 141.
【００１９】次いで、スライドコア１７を上昇させ、冷
却媒体注入装置１５及び冷却媒体排出装置１６のシリン
ダユニット１５、１６を前進させて冷却媒体注入ノズル
１５２及び冷却媒体排出ノズル１６２を中空部２３に圧
入させ、冷却媒体注入装置１５の冷却媒体注入ノズル１
５２から冷却媒体を中空部２３に注入すると共に中空部
２３から冷却媒体を冷却媒体排出装置１６の冷却媒体排
出ノズル１６２から排出させることにより冷却媒体を中
空部２３に流通させ、中空部２３を冷却する。Next, the slide core 17 is raised and the cylinder units 15 and 16 of the cooling medium injection device 15 and the cooling medium discharge device 16 are advanced to press the cooling medium injection nozzle 152 and the cooling medium discharge nozzle 162 into the hollow portion 23. The cooling medium injection nozzle 1 of the cooling medium injection device 15
The cooling medium is injected from 52 to the hollow portion 23, and the cooling medium is discharged from the cooling medium discharge nozzle 162 of the cooling medium discharge device 16 from the hollow portion 23 to circulate the cooling medium in the hollow portion 23 and cool the hollow portion 23. To do.
【００２０】このようにして中空部２３が冷却媒体によ
り十分に冷却されると冷却媒体注入装置１５及び冷却媒
体排出装置１６のシリンダユニット１５、１６を後退さ
せて中空部２３から冷却媒体注入ノズル１５２及び冷却
媒体排出ノズル１６２を引き抜き、移動型１２を固定型
１１から移動させ、キャビティ１３から容器状の成形体
２１を取り出し、１回の成形サイクルを終了する。When the hollow portion 23 is sufficiently cooled by the cooling medium in this way, the cylinder units 15, 16 of the cooling medium injection device 15 and the cooling medium discharge device 16 are retracted so that the cooling medium injection nozzle 152 from the hollow portion 23. Further, the cooling medium discharge nozzle 162 is pulled out, the movable die 12 is moved from the fixed die 11, the container-shaped compact 21 is taken out from the cavity 13, and one molding cycle is completed.
【００２１】以降、同様のサイクルを繰り返すことによ
り中空成形体２１を製造する。After that, the hollow molded body 21 is manufactured by repeating the same cycle.
【００２２】[0022]
【実施例】図１〜４に示す射出成形用金型１を使用し、
熱可塑性樹脂としてポリプロピレンを使用し、ガスとし
て空気を使用し、冷却媒体として水を使用して中空成形
体２１を製造し、成形時間を測定した結果、表１に示す
通りであった。EXAMPLE Using an injection molding die 1 shown in FIGS.
The polypropylene was used as the thermoplastic resin, air was used as the gas, and water was used as the cooling medium to manufacture the hollow molded body 21, and the molding time was measured. The results are shown in Table 1.
【００２３】[0023]
【比較例】冷却媒体注入装置１５及び冷却媒体注入装置
１６をしなかった点を除き実施例と同様にして中空成形
体２１を製造し、成形時間を測定した結果、表１に示す
通りであった。Comparative Example A hollow molded body 21 was manufactured in the same manner as in Example except that the cooling medium injection device 15 and the cooling medium injection device 16 were not used, and the molding time was measured. The results are shown in Table 1. It was
【００２４】[0024]
【表１】 [Table 1]
【００２５】表１に示すように、本発明方法において
は、比較例に比較して成形時間を大幅に短縮できた。As shown in Table 1, in the method of the present invention, the molding time could be shortened significantly as compared with the comparative example.
【００２６】以上、本発明の実施の形態を図により説明
したが、本発明の具体的な実施の態様は図示の本発明の
実施の形態に限定されるものではなく、本発明の要旨を
逸脱しない範囲の各種の設計変更は本発明の範囲に含ま
れる。Although the embodiments of the present invention have been described above with reference to the drawings, the specific embodiments of the present invention are not limited to the illustrated embodiments of the present invention, and deviate from the gist of the present invention. Various design changes that do not occur are included in the scope of the present invention.
【００２７】例えば、ガス注入及び排出装置１４の注入
排出ノズル１４１をキャビティ１３に対して前進後退さ
せるようにしてもよい。又、本発明方法によっては、図
１、２に示すように容器状の成形体２１を成形する代わ
りに各種形状の成形体を成形できる。For example, the injection and discharge nozzle 141 of the gas injection and discharge device 14 may be moved forward and backward with respect to the cavity 13. Further, according to the method of the present invention, molded articles having various shapes can be molded instead of molding the container-shaped molded article 21 as shown in FIGS.
【００２８】[0028]
【発明の効果】請求項１記載の本発明中空成形体の製造
方法においては、中空部に冷却媒体を注入することによ
り中空成形体を冷却するものであるから、中空成形体を
短時間に冷却することができる。According to the method for producing a hollow molded body of the present invention as set forth in claim 1, the hollow molded body is cooled by injecting a cooling medium into the hollow portion. Therefore, the hollow molded body is cooled in a short time. can do.
【００２９】又、請求項２記載の本発明中空成形体の製
造方法においては、熱可塑性樹脂内へのガスの注入部が
焼結金属で構成されているので、ガスの注入部にガスは
通過するが液体の冷却媒体は通過させない微細孔を構成
するのが容易であり、安価である。Further, in the method for producing a hollow molded article according to the present invention as defined in claim 2, since the injection portion of the gas into the thermoplastic resin is made of sintered metal, the gas passes through the injection portion of the gas. However, it is easy and inexpensive to form fine pores through which a liquid cooling medium does not pass.
【図１】本発明中空成形体の製造方法の一実施態様を示
す断面図。FIG. 1 is a sectional view showing an embodiment of a method for producing a hollow molded body of the present invention.
【図２】図１に示す本発明中空成形体の製造方法の態様
の次工程を示す断面図。FIG. 2 is a cross-sectional view showing a next step of the embodiment of the method for producing a hollow molded body of the present invention shown in FIG.
【図３】図１に示すガス注入及び排出装置を拡大して示
す正面図。3 is an enlarged front view of the gas injection and exhaust device shown in FIG.
【図４】図１に示す冷却媒体注入装置もしくは冷却媒体
排出装置を拡大して示す正面図。4 is an enlarged front view of the cooling medium injection device or the cooling medium discharge device shown in FIG.
１ 射出成形用金型 １１ 固定型 １２ 移動型 １３ キャビティ １４ ガス注入及び排出装置 １４１ 注入排出ノズル １４２ 微細孔 １４３ 給排気管 １５ 冷却媒体注入装置 １５１ シリンダユニット １５２ 冷却媒体注入ノズル １５３ パッキン １５４ 冷却媒体流通管 １６ 冷却媒体排出装置 １６１ シリンダユニット １６２ 冷却媒体排出ノズル １６３ パッキン １６４ 冷却媒体流通管 DESCRIPTION OF SYMBOLS 1 Injection molding die 11 Fixed type 12 Movable type 13 Cavity 14 Gas injection and discharge device 141 Injection discharge nozzle 142 Fine hole 143 Supply / exhaust pipe 15 Cooling medium injection device 151 Cylinder unit 152 Cooling medium injection nozzle 153 Packing 154 Cooling medium distribution Pipe 16 Cooling medium discharge device 161 Cylinder unit 162 Cooling medium discharge nozzle 163 Packing 164 Cooling medium flow pipe
Claims (2)
態の熱可塑性樹脂を射出し、熱可塑性樹脂内にガスを注
入して熱可塑性樹脂内に中空部を形成し、中空部のガス
を所定圧に保持する中空成形体の製造方法において、中
空部に冷却媒体を注入することにより中空成形体を冷却
することを特徴とする中空成形体の製造方法。1. A molten thermoplastic resin is injected into a cavity of an injection molding die, and a gas is injected into the thermoplastic resin to form a hollow portion in the thermoplastic resin. A method for producing a hollow molded body, which comprises cooling the hollow molded body by injecting a cooling medium into the hollow portion in the method for producing the hollow molded body which is maintained at a predetermined pressure.
金属で構成されていることを特徴とする請求項１記載の
中空成形体の製造方法。2. The method for producing a hollow molded article according to claim 1, wherein the injection portion of the gas into the thermoplastic resin is made of sintered metal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12707596A JPH09309126A (en) | 1996-05-22 | 1996-05-22 | Manufacture of hollow molded body |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12707596A JPH09309126A (en) | 1996-05-22 | 1996-05-22 | Manufacture of hollow molded body |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH09309126A true JPH09309126A (en) | 1997-12-02 |
Family
ID=14950966
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12707596A Pending JPH09309126A (en) | 1996-05-22 | 1996-05-22 | Manufacture of hollow molded body |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH09309126A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2002060670A1 (en) * | 2000-12-01 | 2002-08-08 | Infiltrator Systems, Inc. | Method for circulating pressurized fluids to improve gas channel cooling |
| WO2002087844A1 (en) * | 2001-04-26 | 2002-11-07 | Cinpres Gas Injection Limited | Method and apparatus for injection moulding |
-
1996
- 1996-05-22 JP JP12707596A patent/JPH09309126A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2002060670A1 (en) * | 2000-12-01 | 2002-08-08 | Infiltrator Systems, Inc. | Method for circulating pressurized fluids to improve gas channel cooling |
| US6680011B2 (en) | 2000-12-01 | 2004-01-20 | Infiltrator Systems, Inc. | Method for circulating pressurized fluids to improve gas channel cooling |
| WO2002087844A1 (en) * | 2001-04-26 | 2002-11-07 | Cinpres Gas Injection Limited | Method and apparatus for injection moulding |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| TWI258763B (en) | Molding method and mold | |
| JPH09309126A (en) | Manufacture of hollow molded body | |
| JPS641052Y2 (en) | ||
| JPH0655563A (en) | Manufacture for hollow molded body | |
| JP3012197B2 (en) | Blow molding method | |
| CN219133021U (en) | Nozzle device with exhaust function | |
| JPH08216237A (en) | Hollow mold and production of hollow molded product | |
| CN216325034U (en) | Pouring channel thimble convenient to replace quickly for extrusion casting mold | |
| JP2790345B2 (en) | Manufacturing method of injection molded products | |
| JP3684835B2 (en) | Injection molding method | |
| JP2867864B2 (en) | Molding method of hollow molded body | |
| JPH07124984A (en) | Preparation of injection-molded article and nozzle used for it | |
| CN218429894U (en) | Mold core mold locking ring, mold core and mold core mold locking ring combined structure and injection mold | |
| KR0149202B1 (en) | Injection nozzle | |
| CN217258090U (en) | Die for manufacturing air conditioner swing blade transmission shaft | |
| CN219522921U (en) | Traceless ejection structure and die | |
| CN218366240U (en) | Precision gas-assisted molding injection mold for accessory processing | |
| CN212554788U (en) | Injection mold for preparing plastic part without water gap material | |
| CN214926759U (en) | Precise plastic injection molding mold | |
| JP6756958B1 (en) | Injection molding equipment and method | |
| JP2000084982A (en) | Injection mold and injection molding method using the same | |
| JP2607072Y2 (en) | Mold for blow molding | |
| JP2605751Y2 (en) | Mold | |
| JPH05337994A (en) | Production of injection-molded object | |
| JP2701112B2 (en) | Pressurized fluid injection nozzle |