JPH08252872A - Manufacture of hollow resin molding - Google Patents

Manufacture of hollow resin molding

Info

Publication number
JPH08252872A
JPH08252872A JP8489895A JP8489895A JPH08252872A JP H08252872 A JPH08252872 A JP H08252872A JP 8489895 A JP8489895 A JP 8489895A JP 8489895 A JP8489895 A JP 8489895A JP H08252872 A JPH08252872 A JP H08252872A
Authority
JP
Japan
Prior art keywords
resin
molded body
molding
primary
thermoplastic 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.)
Granted
Application number
JP8489895A
Other languages
Japanese (ja)
Other versions
JP3516513B2 (en
Inventor
Takashi Kajiwara
隆司 梶原
Minoru Hoshino
実 星野
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.)
Molten Corp
Original Assignee
Molten 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 Molten Corp filed Critical Molten Corp
Priority to JP8489895A priority Critical patent/JP3516513B2/en
Publication of JPH08252872A publication Critical patent/JPH08252872A/en
Application granted granted Critical
Publication of JP3516513B2 publication Critical patent/JP3516513B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/14Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
    • B29C45/14598Coating tubular articles
    • B29C45/14622Lining the inner or outer surface of tubular articles
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C33/00Moulds or cores; Details thereof or accessories therefor
    • B29C33/44Moulds or cores; Details thereof or accessories therefor with means for, or specially constructed to facilitate, the removal of articles, e.g. of undercut articles
    • B29C33/52Moulds or cores; Details thereof or accessories therefor with means for, or specially constructed to facilitate, the removal of articles, e.g. of undercut articles soluble or fusible
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/14Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
    • B29C45/14836Preventing damage of inserts during injection, e.g. collapse of hollow inserts, breakage
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C33/00Moulds or cores; Details thereof or accessories therefor
    • B29C33/44Moulds or cores; Details thereof or accessories therefor with means for, or specially constructed to facilitate, the removal of articles, e.g. of undercut articles
    • B29C33/52Moulds or cores; Details thereof or accessories therefor with means for, or specially constructed to facilitate, the removal of articles, e.g. of undercut articles soluble or fusible
    • B29C2033/525Cores made of frozen liquids, e.g. ice
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/14Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
    • B29C45/14336Coating a portion of the article, e.g. the edge of the article
    • B29C2045/1445Coating a portion of the article, e.g. the edge of the article injecting a part onto a blow moulded object
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/14Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
    • B29C45/14065Positioning or centering articles in the mould
    • B29C45/14073Positioning or centering articles in the mould using means being retractable during injection

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)
  • Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)

Abstract

PURPOSE: To provide a method for manufacturing a resin molding having a bent hollow part. CONSTITUTION: After a molding 17 having a hollow part bent by a blow molding method is molded, water is filled in the hollow part, and frozen. The molding is used as a core, set in a mold, thermostatic resin is cast, and a formed molding 27 is formed. Since the molded and formed resins are compatible with each other, the molded and formed moldings are integrated. Thus, a hollow molding bent in three-dimensions can be molded. The resins having different characteristics are used as the molded and formed moldings to improve the functions of the product.

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、貫通孔等中空部分を有
する樹脂成形品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 producing a resin molded product having a hollow portion such as a through hole.

【0002】[0002]

【従来の技術】従来、複雑に湾曲した中空部、例えば貫
通孔を有する製品を、熱可塑性樹脂を用いて射出成形法
により成形する場合、成形後成形品から抜き取りが可能
となるよう複数個に分割されたスライドコアが用いられ
る。図8及び9は、シャワーの把手を製造するための金
型1,2を示し、把手内の貫通孔は、2種のスライドコ
ア4,5にて形成される。一方のスライドコア3は、一
定の弧を描く円柱状であり、他方のスライドコア5は、
短い円柱状の上面を斜めに切断した形状を有する。これ
らのスライドコア4,5は、把手の外形形状に一致する
金型1,2のキャビティ6内に支持され、射出成形され
る。成形後、金型1,2は分割され、成形品(把手)3
が取り出される。その後スライドコア4,5は、成形品
3から抜き取られる。図10に示すように、把手3の
水、湯の出口にパッキン7、カバー8及びノズル9がネ
ジ10にて固定される。
2. Description of the Related Art Conventionally, when a product having a complicatedly curved hollow portion, for example, a through hole is molded by an injection molding method using a thermoplastic resin, a plurality of products are formed so that the molded product can be extracted after molding. A divided slide core is used. 8 and 9 show molds 1 and 2 for manufacturing a handle of a shower, and a through hole in the handle is formed by two types of slide cores 4 and 5. One slide core 3 is a cylinder that draws a certain arc, and the other slide core 5 is
It has a shape in which the upper surface of a short column is cut obliquely. These slide cores 4 and 5 are supported in the cavities 6 of the molds 1 and 2 that conform to the outer shape of the handle and injection molded. After molding, the molds 1 and 2 are divided, and the molded product (handle) 3
Is taken out. After that, the slide cores 4 and 5 are removed from the molded product 3. As shown in FIG. 10, the packing 7, the cover 8 and the nozzle 9 are fixed to the outlet of water and hot water of the handle 3 with screws 10.

【0003】[0003]

【発明が解決しようとする課題】上記製造方法では、ス
ライドコア4,5を成形品から抜き取る必要があるた
め、2つのコアに分割しなければならないこと、スライ
ドコア4の湾曲線を一定の半径に設定しなければなら
ず、また図中右側の径を左側より太くしなければならな
いこと、さらにスライドコア4,5ともにアンダーカッ
トが形成できないこと等の制約がある。これらの制約
は、金型構造を複雑にし、また成形品の構造及びデザイ
ンを制限し、目的とする機能を十全には得ることができ
ないという問題を生ずる。本発明は、このような事情に
鑑みてなされたもので、金型構造上の制約を受けること
なく、成形品の用途に最も適した構造を実現することが
できる中空樹脂成形品の製造方法を提供するものであ
る。
In the above manufacturing method, since the slide cores 4 and 5 need to be removed from the molded product, they must be divided into two cores, and the curved line of the slide core 4 has a constant radius. There is a restriction that the diameter on the right side in the figure must be made larger than that on the left side, and that undercuts cannot be formed on both slide cores 4 and 5. These restrictions give rise to the problem that the mold structure is complicated, the structure and design of the molded product are limited, and the desired function cannot be fully obtained. The present invention has been made in view of such circumstances, and provides a method for producing a hollow resin molded product, which is capable of realizing a structure most suitable for the purpose of the molded product without being restricted by the mold structure. It is provided.

【0004】[0004]

【課題を解決するための手段】本発明に係る中空樹脂成
形品の製造方法は、第1の熱可塑性樹脂をブロー成形法
にて中空体の1次成形体に形成する工程、上記1次成形
体内に液体を充填し、これを凍結させる工程、上記凍結
した1次成形体を、射出成形金型のキャビティ内に中子
として配置した後、該キャビティ内に加熱溶融した第2
の熱可塑性樹脂を射出注入し、該第2の熱可塑性樹脂に
て上記1次成形体を被覆して2次成形体を形成する工
程、成形後、上記2次成形体を上記成形金型より取り出
し、上記1次成形体内の液体を除去する工程、よりな
る。
The method for producing a hollow resin molded article according to the present invention comprises a step of forming a first thermoplastic resin into a hollow primary molding by a blow molding method, the above-mentioned primary molding. A step of filling a liquid in a body and freezing it, arranging the frozen primary molded body as a core in a cavity of an injection molding die, and then heating and melting in the cavity
Injecting and injecting the thermoplastic resin, and forming the secondary molded body by coating the primary molded body with the second thermoplastic resin, after molding, the secondary molded body from the molding die. And removing the liquid in the primary molded body.

【0005】また本発明においては、上記第1の熱可塑
性樹脂と上記第2の熱可塑性樹脂がABS樹脂よりなり
かつ液体流通のための貫通孔を有する成形品の製造方法
とすることができる。
Further, according to the present invention, it is possible to provide a method for producing a molded article in which the first thermoplastic resin and the second thermoplastic resin are made of ABS resin and have through holes for liquid circulation.

【0006】また本発明においては、上記第1の熱可塑
性樹脂が、ポリエチレン樹脂よりなり、かつ上記第2の
熱可塑性樹脂がナイロン樹脂よりなり、気体導通のため
の貫通孔を有する成形品の製造方法とすることができ
る。
In the present invention, the first thermoplastic resin is made of polyethylene resin and the second thermoplastic resin is made of nylon resin, and a molded article having through holes for gas conduction is manufactured. Can be a method.

【0007】[0007]

【実施例】以下に実施例としてシャワーの把手11(図
5)を製造する場合につき説明する。図1において、1
2,13は、把手11の1次成形体を成形するためのブ
ロー成形金型で、左右方向に二分割される。14は、加
熱軟化されたABS(アクリロニトリルブタジエンスチ
レン)樹脂よりなるパリソンで、上方に設置された押出
機(図示せず)から円筒状に成形されて下方に向けて押
し出される。パリソン14は、左右に型開きされた金型
12,13の間へ垂下され、その下方移動が停止された
状態で金型12,13が型締めされる。続いて金型1
2,13の下方分割面に配置された空気吹き出し針15
より、キャビティ16内に空気が吹き込まれる。キャビ
ティ16内の空気圧の上昇により樹脂は金型12,13
内面に押し当てられキャビティ16の形状に成形され、
厚さ約1mmの1次成形体17が形成される。
EXAMPLE The case of manufacturing the shower handle 11 (FIG. 5) will be described below as an example. In FIG. 1, 1
Reference numerals 2 and 13 denote blow molding dies for molding the primary molded body of the handle 11, which are divided into two parts in the left-right direction. Reference numeral 14 is a parison made of heat-softened ABS (acrylonitrile butadiene styrene) resin, which is molded into a cylindrical shape from an extruder (not shown) installed above and extruded downward. The parison 14 is hung down between the molds 12 and 13 opened to the left and right, and the molds 12 and 13 are clamped with the downward movement stopped. Then mold 1
Air blowing needles 15 arranged on the lower divided surfaces 2 and 13
As a result, air is blown into the cavity 16. As the air pressure in the cavity 16 rises, the resin is removed from the molds 12, 13
It is pressed against the inner surface and molded into the shape of the cavity 16,
A primary molded body 17 having a thickness of about 1 mm is formed.

【0008】次いで図2に示すように、針15により形
成された小孔18から1次成形体17内に水19が充填
される。この小孔18を栓20等で閉鎖し、冷凍雰囲気
中に置き、水19を凍結させる。
Next, as shown in FIG. 2, water 19 is filled into the primary molded body 17 through the small hole 18 formed by the needle 15. This small hole 18 is closed with a stopper 20 or the like and placed in a frozen atmosphere to freeze the water 19.

【0009】図3に示すように、凍結された1次成形体
17は、2次成形体を成形するための射出金型21、2
2のキャビティ23内に中子としてセットされる。キャ
ビティ23内において、1次成形体17は、金型22に
貫通して上下方向に移動可能の状態で支持された2本の
ピン24,24により、宙に浮いた状態で支持される。
25は、射出成形機(図示せず)のノズル、26は一方
の金型21に設けられたゲートである。
As shown in FIG. 3, the frozen primary molded body 17 includes injection molds 21 and 2 for molding the secondary molded body.
It is set in the second cavity 23 as a core. In the cavity 23, the primary molded body 17 is supported in a suspended state by the two pins 24, 24 which penetrate the mold 22 and are supported in a vertically movable manner.
Reference numeral 25 is a nozzle of an injection molding machine (not shown), and 26 is a gate provided in one mold 21.

【0010】係る状態においてノズル25から加熱溶融
されたABS樹脂がキャビティ23内に注入される(図
4)。樹脂がキャビティ23内のほぼ全域に行き渡った
ときピン24,24は、その先端がキャビティ23表面
に一致する位置まで後退せしめられる。ピン24,2
4... の先端表面はキャビティ23表面の性状に一致せ
しめられているから、その痕跡が樹脂表面に現れること
はない。また1次成形体17は、凍結しているためにき
わめて硬く、それ故この1次成形体17が射出圧を受け
て変形するおそれはない。加熱溶融されたABS樹脂
は、同一樹脂よりなる1次成形体17の表面に溶着し、
これと一体化する。かくして2次成形体27が形成され
る。
In this state, the ABS resin heated and melted is injected from the nozzle 25 into the cavity 23 (FIG. 4). When the resin has spread over almost the entire area of the cavity 23, the pins 24, 24 are retracted to a position where their tips are aligned with the surface of the cavity 23. Pins 24 and 2
Since the tip surface of 4 ... is made to match the property of the surface of the cavity 23, the trace thereof does not appear on the resin surface. Further, the primary molded body 17 is extremely hard because it is frozen, and therefore, there is no possibility that the primary molded body 17 will be deformed by receiving the injection pressure. The heat-melted ABS resin is welded to the surface of the primary molded body 17 made of the same resin,
Integrate with this. Thus, the secondary molded body 27 is formed.

【0011】成形終了後、金型21,22は分割され、
2次成形体27が取り出される(図5)。1次成形体1
7内の水19は、射出成形時加わる熱により、またその
後の加温処理により融解し、開放された小孔18から除
去される。しかる後、1次成形体17の両端部分(破線
aで示す)が切断され、水、湯の出口28にパッキン
7、カバー8及びノズル9がネジ10により固定され
て、把手11が完成する。上記実施例において、ABS
樹脂を使用したのは、この樹脂が耐熱性及び耐水性に優
れており、水、湯を通すシャワーの把手の材料として適
しているからである。
After the molding is completed, the molds 21 and 22 are divided into
The secondary molded body 27 is taken out (FIG. 5). Primary molded body 1
The water 19 in 7 is melted by the heat applied during injection molding and by the subsequent heating treatment, and is removed from the open small holes 18. After that, both ends (shown by the broken line a) of the primary molded body 17 are cut, and the packing 7, the cover 8 and the nozzle 9 are fixed to the outlet 28 of water and hot water with the screw 10, and the handle 11 is completed. In the above embodiment, ABS
The resin is used because it is excellent in heat resistance and water resistance, and is suitable as a material for a handle of a shower that passes water and hot water.

【0012】上記製造方法によってシャワーの把手を製
造した場合には、構造及びデザインの設計を自由に行う
ことができる。即ち1次成形体17で形成される貫通孔
30の径を最大限大きく、したがって2次成形体27の
肉厚を薄くすることにより、軽量化を図ることができる
のである。また貫通孔30の形状が、金型構造の影響を
受けることはないから、デザインの幅が広がり、商品価
値を高めることができる。
When the handle of the shower is manufactured by the above manufacturing method, the structure and design can be freely designed. That is, the weight can be reduced by maximizing the diameter of the through hole 30 formed by the primary molded body 17 and thus reducing the thickness of the secondary molded body 27. Further, since the shape of the through hole 30 is not affected by the mold structure, the range of design can be expanded and the commercial value can be increased.

【0013】上記実施例では、シャワーの把手29の製
造に応用した場合を説明したが、その他水、湯等の液体
を通すパイプ例えばガス給湯器の給湯パイプにも利用で
きる。
In the above embodiment, the case of application to the production of the handle 29 of the shower has been described, but it can also be used as a pipe for passing a liquid such as water or hot water, for example, a hot water supply pipe of a gas water heater.

【0014】また上記実施例では、水、湯を通すシャワ
ー把手、パイプの材料としてABS樹脂を用いた場合に
つき説明したが、このほか1次成形体と2次成形体の材
料の組合せは次のものが可能である。すなわち、ABS
樹脂とポリエチレン(以下PEという)樹脂、ABS樹
脂とポリプロピレン(以下PPという)樹脂、ポリフェ
ニレンオキサイド(以下PPOという)樹脂とABS樹
脂、PPO樹脂とPP樹脂、PPO樹脂とPE樹脂、A
BS樹脂とポリブチレンテレフタレート(以下PBTと
いう)樹脂、PE樹脂とPBT樹脂、PP樹脂とPBT
樹脂、ABS樹脂とポリエチレンテレフタレート(以下
PETという)樹脂、PE樹脂とPET樹脂、PP樹脂
とPET樹脂の組合せである。
In the above embodiment, the case where the ABS resin is used as the material of the shower handle for passing water and hot water and the pipe has been described. In addition to this, the combination of the materials of the primary molding and the secondary molding is as follows. Things are possible. That is, ABS
Resin and polyethylene (hereinafter PE) resin, ABS resin and polypropylene (hereinafter PP) resin, polyphenylene oxide (hereinafter PPO) resin and ABS resin, PPO resin and PP resin, PPO resin and PE resin, A
BS resin and polybutylene terephthalate (hereinafter referred to as PBT) resin, PE resin and PBT resin, PP resin and PBT
Resin, ABS resin and polyethylene terephthalate (hereinafter referred to as PET) resin, PE resin and PET resin, and PP resin and PET resin in combination.

【0015】図6及び図7は、他の実施例を示し、自動
車のエンジンへ気化ガソリンを送り込むエアインテーク
パイプ31の製造に応用した場合である。エアインテー
クパイプ31は、狭いエンジンルームに収納されるもの
であるため湾曲せざるを得ず、図示のごとく3次元湾曲
構造となる場合が多い。係る構造のエアインテークパイ
プ31を従来の射出成形法で成形することは極めて難し
くまたコストも高くなる。エアインテークパイプ31
は、加圧された気化ガソリンを通過させるものであるか
らガスバリヤ性及び耐圧性が、また温度が上昇するエン
ジンの近くに位置するため耐熱性が、さらに常時振動が
加わるために耐振動性が要求される。これらの要求を満
たすためにエアインテークパイプ31の1次成形体32
には、ガスバリヤ性及び耐熱性に優れたPE樹脂が使用
される。また2次成形体33には、耐圧性及び耐振動性
に優れたナイロン樹脂が使用される。このナイロン樹脂
は、PE樹脂に対し相溶性はもたないが、1次、2次成
形体は複雑な湾曲構造を有するために機械的に強く結合
する。
FIGS. 6 and 7 show another embodiment, which is applied to the manufacture of the air intake pipe 31 for sending vaporized gasoline to the engine of an automobile. Since the air intake pipe 31 is housed in a narrow engine room, it must be bent, and often has a three-dimensional bending structure as shown in the drawing. It is extremely difficult and costly to mold the air intake pipe 31 having such a structure by the conventional injection molding method. Air intake pipe 31
Is required to have gas barrier properties and pressure resistance because it passes pressurized vaporized gasoline, heat resistance because it is located near the engine where the temperature rises, and vibration resistance because it is constantly subject to vibration. To be done. To meet these requirements, the primary molded body 32 of the air intake pipe 31
For this, PE resin having excellent gas barrier properties and heat resistance is used. The secondary molded body 33 is made of nylon resin having excellent pressure resistance and vibration resistance. This nylon resin has no compatibility with the PE resin, but the primary and secondary moldings have a complicated curved structure, and therefore mechanically bond strongly.

【0016】エアインテークパイプ31の製造方法は前
述の例と同一である。即ち1次成形体32は、PE樹脂
のブロー成形法にて袋状の3次元湾曲体に成形され、こ
れに水が充填され凍結される。凍結された1次成形体3
2は、射出成形金型内にピンにて支持され、これを中子
として金型内にナイロン樹脂が注入され、1次成形体3
2の外側を覆って2次成形体33が成形される。成形後
2次成形体33は金型から取り出され、1次成形体32
の両端が切断されて、水が除去されて貫通孔が形成され
る。かくして2層構造のエアインテークパイプ31が完
成する。34,34は、パイプ両端に設けられた鍔状部
分で、一方の鍔状部分34はエアフィルター(図示せ
ず)に、また他方の鍔状部分34は、エンジン(図示せ
ず)に弾性パッキン35を介して接続される。
The manufacturing method of the air intake pipe 31 is the same as the above-mentioned example. That is, the primary molded body 32 is molded into a bag-shaped three-dimensional curved body by the blow molding method of PE resin, and this is filled with water and frozen. Frozen primary molded body 3
2 is supported by a pin in an injection molding die, and a nylon resin is injected into the die by using this as a core.
The secondary molded body 33 is molded so as to cover the outside of 2. After the molding, the secondary molded body 33 is taken out from the mold and the primary molded body 32 is removed.
Both ends of are cut to remove water and form through holes. Thus, the air intake pipe 31 having a two-layer structure is completed. Reference numerals 34 and 34 denote collar-shaped portions provided at both ends of the pipe. One collar-shaped portion 34 is an air filter (not shown), and the other collar-shaped portion 34 is an elastic packing to an engine (not shown). It is connected via 35.

【0017】弾性を有するパッキン35をエアインテー
クパイプ31に一体成形することも可能であり、この場
合、パッキン成形金型にエアインテークパイプ31を中
子として固定し、パッキン材料として例えばナイロンエ
ラストマーを射出注入する。このパッキン材料は成形と
同時にエアインテークパイプ31の鍔状部分に溶着す
る。
It is also possible to integrally mold the elastic packing 35 to the air intake pipe 31, and in this case, the air intake pipe 31 is fixed as a core to the packing molding die, and, for example, nylon elastomer is injected as the packing material. inject. The packing material is welded to the brim portion of the air intake pipe 31 simultaneously with molding.

【0018】上記実施例では、自動車のエアインテーク
パイプに応用した例につき説明したが、熱源の近くに配
置される気体流通パイプ例えばガス給湯器のガスパイプ
の製造にも適している。
In the above embodiment, the example applied to the air intake pipe of the automobile has been described, but it is also suitable for manufacturing a gas distribution pipe arranged near a heat source, for example, a gas pipe of a gas water heater.

【0019】また上記実施例では、自動車のエアインテ
ークパイプ等気体流通パイプの材料としてPE樹脂とナ
イロン樹脂の組合せにつき説明したが、1次、2次成形
体の材料として次の組合せが可能である。即ち、ABS
樹脂とPE樹脂、PPO樹脂とPE樹脂、PE樹脂とP
BT樹脂、PE樹脂とPET樹脂である。
In the above embodiment, the combination of PE resin and nylon resin has been described as the material of the gas flow pipe such as the air intake pipe of the automobile, but the following combinations are possible as the material of the primary and secondary molded bodies. . That is, ABS
Resin and PE resin, PPO resin and PE resin, PE resin and P
These are BT resin, PE resin and PET resin.

【0020】[0020]

【発明の効果】以上のように本発明によれば、湾曲した
中空部分を有する樹脂成形品を製造するに際し、中空部
分を有する1次成形体がブロー成形法にて成形されるか
ら、所望の湾曲中空構造、例えば3次元に湾曲した中空
体であっても容易に得られ、成形品の機能及び用途に最
も適した構造を実現することができる。
As described above, according to the present invention, when a resin molded product having a curved hollow portion is manufactured, a primary molded body having a hollow portion is molded by a blow molding method. A curved hollow structure, for example, a hollow body curved in three dimensions, can be easily obtained, and a structure most suitable for the function and application of the molded product can be realized.

【0021】また本発明によれば、1次成形体及び2次
成形体を構成する熱可塑性樹脂としてABS樹脂を使用
した場合、その耐熱性及び耐水性に優れるという特性か
ら、液体を流通させるためのパイプに適用して有益であ
る。
Further, according to the present invention, when ABS resin is used as the thermoplastic resin constituting the primary molded body and the secondary molded body, the liquid is circulated because of its excellent heat resistance and water resistance. It is useful to apply to the pipe.

【0022】また本発明によれば、用途に応じて1次成
形体及び2次成形体を構成する熱可塑性樹脂に、それぞ
れ異なる特性をもつ樹脂が使用できる。例えば気体を通
すパイプにあっては1次成形体をガスバリヤ性及び耐熱
性に優れたPE樹脂にて形成し、2次成形体を耐圧性に
優れたナイロン樹脂にて形成することにより、単一の樹
脂成形品では得られない優れた特性をもつ気体導通パイ
プの製造が可能となる。
Further, according to the present invention, resins having different characteristics can be used as the thermoplastic resin forming the primary molded body and the secondary molded body depending on the application. For example, in the case of a pipe through which a gas passes, the primary molded body is made of PE resin having excellent gas barrier properties and heat resistance, and the secondary molded body is made of nylon resin having excellent pressure resistance. It is possible to manufacture a gas-conducting pipe having excellent characteristics that cannot be obtained with the resin molded product of.

【0023】さらに本発明によれば、2次成形体が射出
成形法にて成形されるから、ブロー成形法のみでは得ら
れない自由なデザイン設計が可能であり、商品価値の高
い成形品の製造が可能となる。
Further, according to the present invention, since the secondary molded body is molded by the injection molding method, it is possible to design freely, which cannot be obtained only by the blow molding method, and to manufacture a molded product of high commercial value. Is possible.

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

【図1】本発明実施例を説明するための断面図である。FIG. 1 is a cross-sectional view for explaining an embodiment of the present invention.

【図2】同実施例における1次成形体の断面図である。FIG. 2 is a sectional view of a primary molded body in the example.

【図3】同実施例における2次成形体の成形方法を説明
するための断面図である。
FIG. 3 is a cross-sectional view for explaining a molding method of a secondary molded body in the example.

【図4】同実施例における2次成形体の成形方法を説明
するための断面図である。
FIG. 4 is a cross-sectional view for explaining a molding method of the secondary molded body in the example.

【図5】同実施例にて成形されたシャワー把手を示す断
面図である。
FIG. 5 is a cross-sectional view showing a shower handle formed in the same example.

【図6】本発明他の実施例を説明するため斜視図であ
る。
FIG. 6 is a perspective view for explaining another embodiment of the present invention.

【図7】図6A−A線断面図である。FIG. 7 is a cross-sectional view taken along the line AA of FIG.

【図8】従来例方法を説明するための金型断面図であ
る。
FIG. 8 is a sectional view of a mold for explaining a conventional example method.

【図9】同従来例方法を説明するための金型断面図であ
る。
FIG. 9 is a cross-sectional view of a mold for explaining the conventional method.

【図10】同従来例方法にて成形されたシャワー把手の
断面図である。
FIG. 10 is a cross-sectional view of a shower handle formed by the conventional method.

【符号の説明】[Explanation of symbols]

12,13………金型 14………パリソン 16………キャビティ 17………1次成形体 19………水 21,22………金型 23………キャビティ 24,24………ピン 25………ノズル 27……2次成形体 29………把手 30………貫通孔 31………エアインテークパイプ 32………1次成形体 33………2次成形体 35………鍔状部分 36………パッキン 12, 13 ………… Mold 14 ………… Parison 16 ………… Cavity 17 ………… Primary compact 19 ………… Water 21,22 ……… Mold 23 ………… Cavity 24,24 ………… Pin 25 ………… Nozzle 27 …… Secondary molded body 29 ………… Grip 30 ………… Through hole 31 ………… Air intake pipe 32 ………… Primary molded body 33 ………… Secondary molded body 35 …… … Bill 36 ……… Packing

───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.6 識別記号 庁内整理番号 FI 技術表示箇所 B29C 69/00 8413−4F B29C 69/00 // B29K 23:00 55:02 77:00 B29L 22:00 ─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. 6 Identification code Internal reference number FI technical display location B29C 69/00 8413-4F B29C 69/00 // B29K 23:00 55:02 77:00 B29L 22 : 00

Claims (3)

【特許請求の範囲】[Claims] 【請求項1】 第1の熱可塑性樹脂をブロー成形法にて
中空体の1次成形体に形成する工程、上記1次成形体内
に液体を充填し、これを凍結させる工程、上記凍結した
1次成形体を、射出成形金型のキャビティ内に中子とし
て配置した後、該キャビティ内に加熱溶融した第2の熱
可塑性樹脂を射出注入し、該第2の熱可塑性樹脂にて上
記1次成形体を被覆して2次成形体を形成する工程、成
形後、上記2次成形体を上記成形金型より取り出し、上
記1次成形体内の液体を除去する工程、を有する中空樹
脂成形品の製造方法。
1. A step of forming the first thermoplastic resin into a hollow primary molded body by a blow molding method, a step of filling the primary molded body with a liquid and freezing it, and the frozen 1 After arranging the next molded body as a core in the cavity of the injection molding die, the second thermoplastic resin which has been heated and melted is injected and injected into the cavity, and the above-mentioned primary A hollow resin molded article, comprising: a step of coating a molded body to form a secondary molded body; and, after molding, removing the secondary molded body from the molding die and removing the liquid in the primary molded body. Production method.
【請求項2】 上記第1の熱可塑性樹脂と上記第2の熱
可塑性樹脂がABS樹脂よりなりかつ液体流通のための
貫通孔を有してなることを特徴とする請求項1記載の中
空樹脂成形品の製造方法。
2. The hollow resin according to claim 1, wherein the first thermoplastic resin and the second thermoplastic resin are made of ABS resin and have through holes for liquid circulation. Molded article manufacturing method.
【請求項3】 上記第1の熱可塑性樹脂が、ポリエチレ
ン樹脂よりなりかつ上記第2の熱可塑性樹脂がナイロン
樹脂よりなり、気体導通のための貫通孔を有してなるこ
とを特徴とする請求項1記載の中空樹脂成形品の製造方
法。
3. The first thermoplastic resin is made of polyethylene resin and the second thermoplastic resin is made of nylon resin, and has a through hole for gas conduction. Item 2. A method for producing a hollow resin molded article according to item 1.
JP8489895A 1995-03-15 1995-03-15 Manufacturing method of hollow resin molded product Expired - Fee Related JP3516513B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8489895A JP3516513B2 (en) 1995-03-15 1995-03-15 Manufacturing method of hollow resin molded product

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8489895A JP3516513B2 (en) 1995-03-15 1995-03-15 Manufacturing method of hollow resin molded product

Publications (2)

Publication Number Publication Date
JPH08252872A true JPH08252872A (en) 1996-10-01
JP3516513B2 JP3516513B2 (en) 2004-04-05

Family

ID=13843564

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8489895A Expired - Fee Related JP3516513B2 (en) 1995-03-15 1995-03-15 Manufacturing method of hollow resin molded product

Country Status (1)

Country Link
JP (1) JP3516513B2 (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008010600A1 (en) * 2006-07-19 2008-01-24 Du Pont-Mitsui Polychemicals Co., Ltd. Manufacturing method of synthetic resin hollow body
JP2008149500A (en) * 2006-12-15 2008-07-03 Nippon Sherwood Medical Industries Ltd Mold for molding cannula and cannula molding method
US8430258B2 (en) 2006-07-19 2013-04-30 Du Pont-Mitsui Poluchemicals Co., Ltd. Synthetic resin hollow body
US8517197B2 (en) 2006-07-19 2013-08-27 Du Pont-Mitsui Polychemicals Co., Ltd. Synthetic resin hollow body
JP2014526982A (en) * 2011-07-12 2014-10-09 コヴェス エヌ.ヴイ. Method for producing a pressure and / or leakproof container for holding gas and / or liquid

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008010600A1 (en) * 2006-07-19 2008-01-24 Du Pont-Mitsui Polychemicals Co., Ltd. Manufacturing method of synthetic resin hollow body
US7988897B2 (en) 2006-07-19 2011-08-02 Du Pont-Mitsui Polychemicals Co., Ltd. Manufacturing method of synthetic resin hollow body
US8430258B2 (en) 2006-07-19 2013-04-30 Du Pont-Mitsui Poluchemicals Co., Ltd. Synthetic resin hollow body
US8517197B2 (en) 2006-07-19 2013-08-27 Du Pont-Mitsui Polychemicals Co., Ltd. Synthetic resin hollow body
JP2008149500A (en) * 2006-12-15 2008-07-03 Nippon Sherwood Medical Industries Ltd Mold for molding cannula and cannula molding method
JP2014526982A (en) * 2011-07-12 2014-10-09 コヴェス エヌ.ヴイ. Method for producing a pressure and / or leakproof container for holding gas and / or liquid

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