JPH03112619A - Manufacture of multi-layer tube joint - Google Patents
Manufacture of multi-layer tube jointInfo
- Publication number
- JPH03112619A JPH03112619A JP25095989A JP25095989A JPH03112619A JP H03112619 A JPH03112619 A JP H03112619A JP 25095989 A JP25095989 A JP 25095989A JP 25095989 A JP25095989 A JP 25095989A JP H03112619 A JPH03112619 A JP H03112619A
- Authority
- JP
- Japan
- Prior art keywords
- outer layer
- layer
- mold
- injection molding
- inner layer
- 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
Links
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 12
- 238000001746 injection moulding Methods 0.000 claims abstract description 31
- 238000010438 heat treatment Methods 0.000 claims abstract description 10
- 230000002093 peripheral effect Effects 0.000 claims abstract description 9
- 238000000034 method Methods 0.000 claims description 11
- 238000002347 injection Methods 0.000 abstract description 9
- 239000007924 injection Substances 0.000 abstract description 9
- 239000000463 material Substances 0.000 abstract 2
- 239000012778 molding material Substances 0.000 description 26
- 239000000835 fiber Substances 0.000 description 9
- 239000004696 Poly ether ether ketone Substances 0.000 description 7
- 229920002530 polyetherether ketone Polymers 0.000 description 7
- 229920005989 resin Polymers 0.000 description 6
- 239000011347 resin Substances 0.000 description 6
- 239000004721 Polyphenylene oxide Substances 0.000 description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 238000000465 moulding Methods 0.000 description 4
- 150000002825 nitriles Chemical class 0.000 description 4
- 229920000570 polyether Polymers 0.000 description 4
- -1 polyethylene Polymers 0.000 description 4
- 239000004697 Polyetherimide Substances 0.000 description 3
- 229920001601 polyetherimide Polymers 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 239000004695 Polyether sulfone Substances 0.000 description 2
- 239000004734 Polyphenylene sulfide Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 229920006351 engineering plastic Polymers 0.000 description 2
- 239000000945 filler Substances 0.000 description 2
- 239000003365 glass fiber Substances 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 239000008188 pellet Substances 0.000 description 2
- 230000000704 physical effect Effects 0.000 description 2
- 229920002492 poly(sulfone) Polymers 0.000 description 2
- 229920006393 polyether sulfone Polymers 0.000 description 2
- 229920000069 polyphenylene sulfide Polymers 0.000 description 2
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 1
- 229920000049 Carbon (fiber) Polymers 0.000 description 1
- 229930182556 Polyacetal Natural products 0.000 description 1
- 239000004952 Polyamide Substances 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 229920004695 VICTREX™ PEEK Polymers 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 230000003712 anti-aging effect Effects 0.000 description 1
- 239000004760 aramid Substances 0.000 description 1
- 229920006231 aramid fiber Polymers 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 229910052796 boron Inorganic materials 0.000 description 1
- 239000004917 carbon fiber Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 239000012784 inorganic fiber Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 229920002647 polyamide Polymers 0.000 description 1
- 229920001707 polybutylene terephthalate Polymers 0.000 description 1
- 229920000515 polycarbonate Polymers 0.000 description 1
- 239000004417 polycarbonate Substances 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 229920006324 polyoxymethylene Polymers 0.000 description 1
- 229920006380 polyphenylene oxide Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 229920000915 polyvinyl chloride Polymers 0.000 description 1
- 239000004800 polyvinyl chloride Substances 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 239000012783 reinforcing fiber Substances 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 1
- 229910010271 silicon carbide Inorganic materials 0.000 description 1
- 229920003002 synthetic resin Polymers 0.000 description 1
- 239000000057 synthetic resin Substances 0.000 description 1
- 229920005992 thermoplastic resin Polymers 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- 239000010936 titanium Substances 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
- B29C45/16—Making multilayered or multicoloured articles
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は、給水管、給湯管などを接続するために用いら
れる多層管継手に関し、詳しくは内層と外層とを異なる
樹脂で形成した合成樹脂製の多層管継手の製造方法に関
する。Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a multilayer pipe joint used to connect water supply pipes, hot water supply pipes, etc. This invention relates to a method of manufacturing multilayer pipe joints manufactured by the Company.
（従来の技術）
合成樹脂製の管継手において、外層と内層とを異なる樹
脂で形成することにより種々の性能を向上することがで
きる。(Prior Art) In a synthetic resin pipe joint, various performances can be improved by forming the outer layer and the inner layer with different resins.
例えば、液体と接する内層は耐熱性、耐熱水性、耐薬品
性等に優れた性質を有する樹脂からなる成形材料にて成
形し、外部に露出し、かつ外部がらの荷重を受は易い外
層は耐衝撃性、耐候性等に優れた樹脂からなる成形材料
にて成形することが考えられる。For example, the inner layer that comes into contact with liquid is molded with a resin molding material that has excellent heat resistance, hot water resistance, chemical resistance, etc., and the outer layer that is exposed to the outside and easily receives loads from the outside is resistant. It is conceivable to mold it with a molding material made of resin that has excellent impact resistance, weather resistance, etc.
このような外層と内層とを有する多層構造の管継手を製
造するにあたって、外層を成形した後、外層を二次射出
成形する金型にインサートし、この状態で内層用の成形
材料を射出すると、内層用の成形材料の熱収縮によって
外層との間でずれを生じ、そのため内外層管の密着性が
悪く、また内層用成形材料の射出圧によって外層にクラ
ックを生じるおそれがある。When manufacturing a pipe joint with a multilayer structure having such an outer layer and an inner layer, after molding the outer layer, the outer layer is inserted into a mold for secondary injection molding, and in this state, the molding material for the inner layer is injected. Heat shrinkage of the molding material for the inner layer causes misalignment between the inner layer and the outer layer, resulting in poor adhesion between the inner and outer tubes, and the injection pressure of the inner layer molding material may cause cracks in the outer layer.
そこで、例えば、特開昭６ｌ−１８９９Ｈ号公報には、
外層を成形した後、外層を二次射出成形する金型にイン
サートすると共に、外層の外面と金型内面との間に二次
射出する内層の成形収縮量に１目当する隙間を設ける技
術が提案されている。この方法によれば、内層の成形収
縮に追従して外層が収縮することで上記問題をある程度
解決することができる。Therefore, for example, in Japanese Patent Application Laid-Open No. 61-1899H,
After the outer layer is molded, the outer layer is inserted into a mold for secondary injection molding, and a gap is created between the outer surface of the outer layer and the inner surface of the mold to match the amount of molding shrinkage of the inner layer to be secondly injected. Proposed. According to this method, the above problem can be solved to some extent by causing the outer layer to shrink following the molding shrinkage of the inner layer.
（発明が解決しようとする課題）
一般に、多層管継手の外層は強度が要求されるために、
外層用成形材料として剛性の高いものが用いられること
が多いが、このような成形材料を用いて上記方法に基づ
いて多層管継手を製造すると、剛性の高い成形材料は、
一般に伸縮性が悪いために内層用成形材料の二次射出圧
によってクラックを生じてしまう。この外層のクラック
を防止するために、二次射出圧を下げていくと、内層に
圧不部（成形材料が存在しない部分）を生じてしまう欠
点がある。(Problems to be Solved by the Invention) Generally, the outer layer of a multilayer pipe joint is required to have strength.
A molding material with high rigidity is often used as a molding material for the outer layer, but when a multilayer pipe joint is manufactured using such a molding material based on the above method, the molding material with high rigidity is
In general, since the elasticity is poor, cracks occur due to the secondary injection pressure of the molding material for the inner layer. If the secondary injection pressure is lowered in order to prevent cracks in the outer layer, there is a drawback in that a pressure-recessed portion (a portion where no molding material is present) is generated in the inner layer.
また、上記方法においては、例えば、内層用成形材料の
流動性が悪い場合には、厚みの薄い内層を成形すること
はできないものである。Further, in the above method, for example, if the fluidity of the molding material for the inner layer is poor, it is not possible to mold a thin inner layer.
本発明は、かかる実状に着目して成されたものであり、
射出成形の際に、外層にクラックを生じるようなことが
なく、また、内層の厚みが薄い場合でも支障なく外層と
内層とを密着性よく成形することができる多層管継手の
製造方法を提供することを目的とする。The present invention has been made by focusing on such actual situation,
To provide a method for manufacturing a multilayer pipe joint that does not cause cracks in the outer layer during injection molding and can mold the outer layer and inner layer with good adhesion without any trouble even when the inner layer is thin. The purpose is to
（課題を解決するための手段）
本発明の多層管継手の製造方法は、円筒状の外層を射出
成形する工程と、外層を金型より取り出し、この外層を
変形しない程度に加熱する工程と、前記加熱された外層
を内層射出成形用金型に組み込む工程と、前記外層の内
周側に円筒状の内層を射出成形する工程と、を包含して
おり、そのことにより上記目的が達成される。(Means for Solving the Problems) The method for manufacturing a multilayer pipe joint of the present invention includes a step of injection molding a cylindrical outer layer, a step of taking out the outer layer from the mold, and heating the outer layer to an extent that it does not deform. The method includes a step of incorporating the heated outer layer into an inner layer injection mold, and a step of injection molding a cylindrical inner layer on the inner peripheral side of the outer layer, thereby achieving the above object. .
以下に、本発明を図面を参照しながら説明する。The present invention will be explained below with reference to the drawings.
第１図は本発明の一例を示したものである。まず第１図
（ａ）に示すように、外層射出成形用外金型３と外層射
出成形用内金型３′とを用いて円筒状の外層１を射出成
形する。次に、この金型３より外層ｌを取り出し、第１
図（ｂ）に示すように必要に応じ加工した後、外層１が
変形しない温度以下で加熱する。加工は、例えば、−火
成形によって生じたランナーに相当する部分や外層ｌの
両端部を切削するものである。外層１を加熱するには、
外層ｌをオーブン中に放置し、あるいは熱風を外層１に
吹き付けることによって行うことができ、これら加熱手
段４での加熱温度は外層ｌが変形しない温度以下で処理
することが必要である。FIG. 1 shows an example of the present invention. First, as shown in FIG. 1(a), a cylindrical outer layer 1 is injection molded using an outer mold 3 for injection molding an outer layer and an inner mold 3' for injection molding an outer layer. Next, take out the outer layer l from this mold 3, and
After processing as required as shown in Figure (b), the outer layer 1 is heated at a temperature below which it does not deform. The processing includes, for example, cutting the portion corresponding to the runner produced by fire forming and both ends of the outer layer l. To heat the outer layer 1,
This can be done by leaving the outer layer 1 in an oven or by blowing hot air onto the outer layer 1, and it is necessary that the heating temperature by the heating means 4 be below a temperature at which the outer layer 1 does not deform.
加熱温度が外層１の変形温度より高いと、多層管継手に
求められる寸法精度が低下する。If the heating temperature is higher than the deformation temperature of the outer layer 1, the dimensional accuracy required for the multilayer pipe joint will decrease.
次に、第１図（ｃ）に示すように、前記加熱された外層
ｌを再び外層射出成形用外金型３に組み込む。次に、第
１図（ｄ）に示すように内金型として外層射出成形用内
金型３°よりも内層２の肉厚分だけ小径の内層射出成形
用金型内５を用い、前記外層ｌの内周側に内層用成形材
料を射出して内層２を成形する。金型３は加温しておく
のが好ましい。Next, as shown in FIG. 1(c), the heated outer layer 1 is again assembled into the outer mold 3 for outer layer injection molding. Next, as shown in FIG. 1(d), an inner mold 5 for inner layer injection molding having a diameter smaller than the inner mold 3 for outer layer injection molding by the thickness of the inner layer 2 is used as the inner mold, and The inner layer 2 is molded by injecting the molding material for the inner layer onto the inner peripheral side of the inner layer. Preferably, the mold 3 is heated.
次に、金型３より取り出し内層２と外層ｌとを有する多
層管継手Ａを得ることができる。Next, the mold 3 is taken out and a multilayer pipe joint A having an inner layer 2 and an outer layer 1 can be obtained.
本発明で用いられる外層ｌ及び内層２を形成する成形材
料としては熱可深性樹脂が好ましく用いられる。特に、
内層用の成形材料としては、ポリエーテルエーテルケト
ン（以下、Ｉ’ＥＥＸという）又はポリエーテルニトリ
ルが好ましく用いられる。A thermoplastic resin is preferably used as the molding material for forming the outer layer 1 and the inner layer 2 used in the present invention. especially,
As the molding material for the inner layer, polyether ether ketone (hereinafter referred to as I'EEX) or polyether nitrile is preferably used.
このＰＥＥＫは、ＩＣ１社が開発した特殊エンジニアリ
ングプラスチックであり、その融点は３３４℃である。This PEEK is a special engineering plastic developed by IC1, and its melting point is 334°C.
ＰＥＥには軽量であって、耐熱性、耐熱水性、耐薬品性
等の諸物性に優れている。ＰＥＥＫの市販品としては、
ＶＩＣＴＲＥＸ ＰＥＥＫ （ＩＣ１社商標）があげら
れる。また、内層２を形成する成形材料はＰＥＥＫを主
成分とし、他の添加剤を含有してもよい。また、ポリエ
ーテルニトリルとは、出光興産−が開発した特殊エンジ
ニアリングプラスチックであり、その融点は３４０℃で
ある。ポリエーテルニトリルは軽量であって耐熱性、耐
熱水性、耐薬品性等の諸物性に優れている。ポリエーテ
ルニトリルは、以下の繰り返し単位を有した構造をもつ
。PEE is lightweight and has excellent physical properties such as heat resistance, hot water resistance, and chemical resistance. Commercially available PEEK products include:
VICTREX PEEK (trademark of IC1) is an example. Further, the molding material forming the inner layer 2 mainly contains PEEK and may contain other additives. Moreover, polyether nitrile is a special engineering plastic developed by Idemitsu Kosan, and its melting point is 340°C. Polyether nitrile is lightweight and has excellent physical properties such as heat resistance, hot water resistance, and chemical resistance. Polyethernitrile has a structure having the following repeating units.
ポリエーテルニトリルの市販品としては、ＩＤ３００
（出光興産■商標）がある。A commercially available polyether nitrile product is ID300.
(Idemitsu Kosan trademark).
外層１を形成する樹脂としては、例えば、ポリアミド、
ポリエチレン、ポリプロピレン、ポリブチレンテレフタ
レート、ポリ塩化ビニル、ポリアセタール、ポリカーボ
ネート、ポリエーテルスルフォン、ポリフェニレンオキ
シド、ポリフェニレンスルフィド、ポリスルホン、ポリ
エーテルイミド等の樹脂があげられ、特に、ポリエーテ
ルイミド、ポリスルホン、ポリエーテルスルフォン、ポ
リフェニレンスルフィドが好ましい。これらの樹脂は、
ＰＥＥに及びポリエーテルニトリルとの熱融着性が優れ
ており、また耐熱性、ｌ１ｉ４候性、耐圧性、耐衝撃性
も比較的優れており着色が可能である。Examples of the resin forming the outer layer 1 include polyamide,
Examples include resins such as polyethylene, polypropylene, polybutylene terephthalate, polyvinyl chloride, polyacetal, polycarbonate, polyether sulfone, polyphenylene oxide, polyphenylene sulfide, polysulfone, polyetherimide, and in particular, polyetherimide, polysulfone, polyether sulfone, Polyphenylene sulfide is preferred. These resins are
It has excellent heat fusion properties with PEE and polyethernitrile, and also has relatively excellent heat resistance, l1i4 weatherability, pressure resistance, and impact resistance, and can be colored.
外層ｌ及び内層２を形成する成形材料には、補強のため
の充填剤、着色剤、老化防止剤等が必要に応じて添加さ
れる。Fillers for reinforcement, colorants, anti-aging agents, etc. are added to the molding materials forming the outer layer 1 and the inner layer 2, as necessary.
充填剤としては、例えば、ガラス繊維、炭素繊維、ボロ
ン繊維、炭化硅素繊維、アルミナ繊維、アモルファス繊
維、シリコン・チタン・］素系’Ｓ維等の無機繊維、ア
ラミド繊維等の有機繊維があげられ、これらの短繊維（
繊維長が２〜３ＩＩＩ１１もしくはそれ以下、繊維径は
５〜２５μｍ程度が好ましい）が実用性を損なわない範
囲で添加される。Examples of fillers include inorganic fibers such as glass fibers, carbon fibers, boron fibers, silicon carbide fibers, alumina fibers, amorphous fibers, silicon/titanium/S fibers, and organic fibers such as aramid fibers. , these short fibers (
The fiber length is preferably 2 to 3III11 or less, and the fiber diameter is preferably about 5 to 25 μm), within a range that does not impair practicality.
このように、外層１を加熱することにより外層ｌに柔軟
性を付与することができ、従って、加熱された外層１を
内層射出成形用金型５内に組み込んで内層用成形材料を
射出する際に二次射出圧によって外層１にクラックを生
じ難く、また外層１の収縮によって外層ｌの外周面と金
型５の内周面との間に隙間が形成されていてもクラック
等を生じることはない。さらに、加熱された外層ｌの内
周側に射出された内層用の成形材料は外層ｌによって冷
却され難く、従ってこの射出された成形材料の粘度が比
較的高く、また内層２の厚みが薄く設定されている場合
でも、内層形成用の空間部に成形材料を充分行き渡らせ
てショートショットを生じることなく所定厚みの内層２
を成形することができる。しかも、射出された内層用成
形材料の温度と外層１の温度差が大きく違わないため、
内層用成形材料の収縮と外層１の収縮がほぼ近似するこ
とになり、内外層２．１間に大きく歪を生じるようなこ
とがなく、従って、内外層２．１間に充分な接着強度が
得られる。In this way, flexibility can be imparted to the outer layer l by heating the outer layer 1, and therefore, when the heated outer layer 1 is incorporated into the inner layer injection molding mold 5 and the inner layer molding material is injected. It is difficult for cracks to occur in the outer layer 1 due to the secondary injection pressure, and even if a gap is formed between the outer peripheral surface of the outer layer 1 and the inner peripheral surface of the mold 5 due to contraction of the outer layer 1, cracks etc. will not occur. do not have. Furthermore, the molding material for the inner layer injected onto the inner peripheral side of the heated outer layer 1 is difficult to be cooled by the outer layer 1, so the viscosity of this injected molding material is relatively high, and the thickness of the inner layer 2 is set thin. Even when the inner layer is formed, the inner layer 2 can be formed to a predetermined thickness without causing short shots by sufficiently distributing the molding material into the space for forming the inner layer.
can be molded. Moreover, since the temperature difference between the injected molding material for the inner layer and the outer layer 1 is not significantly different,
The shrinkage of the molding material for the inner layer and the shrinkage of the outer layer 1 are almost similar, so that no large distortion occurs between the inner and outer layers 2.1, and therefore sufficient adhesive strength is maintained between the inner and outer layers 2.1. can get.
さらに、上記したように加熱された外層ｌを組み込む金
型５は外層射出成形用金型３を用いることもできるので
、新たに金型を製作する必要はなく経済的である。Furthermore, the mold 5 for incorporating the heated outer layer 1 as described above can be the mold 3 for injection molding the outer layer, so there is no need to manufacture a new mold, which is economical.
なお、本発明の多層管継手の製造方法は二層に限らず、
三層以上の多層管継手の製造方法にも適用できるのであ
り、その場合にもインサートする管継手部材を変形しな
い温度で加熱して上記と同様に行うことができる。さら
に、多層管継手の形状は第１図（ｅ）に示したストレー
トタイプのものに限らず、第２図に示すエルボタイプの
ものにも適用することができる。Note that the method for manufacturing the multilayer pipe joint of the present invention is not limited to two layers;
The present invention can also be applied to a method for manufacturing a multilayer pipe joint having three or more layers, and in that case as well, the method described above can be carried out by heating the pipe joint member to be inserted at a temperature that does not deform it. Furthermore, the shape of the multilayer pipe joint is not limited to the straight type shown in FIG. 1(e), but can also be applied to an elbow type shown in FIG.
（実施例） 以下に本発明を実施例に基づいて具体的に説明する。(Example) The present invention will be specifically described below based on Examples.
実ａｍ上
第１図（ｅ）に示す多層管継手を多層射出成形機を用い
て成形した。The multilayer pipe joint shown in FIG. 1(e) was actually molded using a multilayer injection molding machine.
なお、図中１は円筒状の外層、２は外層１の外側に設け
られた円筒状の内層であり、内層２の薄い部分２ａの厚
さはｌｌｌ１１である。In the figure, 1 is a cylindrical outer layer, 2 is a cylindrical inner layer provided outside the outer layer 1, and the thickness of the thin portion 2a of the inner layer 2 is lll11.
まず、ポリエーテルエーテルケトン（ＰＥＥＫ）にて内
層用のペレットを作成し、ポリエーテルイミドにガラス
繊維が３０％混合された成形材料にて外層用のペレット
を作成した。次に、第１図（ａ）に示したように、外層
射出成形用外金型３に上記外層用の成形材料を供給して
射出成形を行い、外層ｌを成形した。First, pellets for the inner layer were made from polyetheretherketone (PEEK), and pellets for the outer layer were made from a molding material containing 30% glass fiber mixed with polyetherimide. Next, as shown in FIG. 1(a), the above molding material for the outer layer was supplied to the outer mold 3 for injection molding of the outer layer and injection molding was performed to form the outer layer 1.
次に、第１図（ｂ）に示すように、外層ｌのランナーに
相当する部分と、外層１の両端部を切削した。次に、外
層ｌをオーブン４内で加熱して１６０℃とし、すぐに第
１図（Ｃ）に示すように、再び外層射出成形用外金型３
内にセットした。なお、ＰＥＥにの変形温度は１７０℃
である。Next, as shown in FIG. 1(b), a portion of the outer layer 1 corresponding to the runner and both ends of the outer layer 1 were cut. Next, the outer layer 1 is heated to 160° C. in the oven 4, and then the outer mold 3 for injection molding of the outer layer is again heated as shown in FIG. 1(C).
I set it inside. In addition, the deformation temperature for PEE is 170℃
It is.
次に、第１図（ｄ）に示すように、内金型として外層射
出成形用内金型３°よりも内層２の肉厚外層間の密着強
度をホ１１定したところ５０Ｋｇ／ａｍ２以下であった
。また、外層ｌに割れを生じていた。Next, as shown in Fig. 1(d), the adhesion strength between the outer layers of the inner layer 2 was determined to be 50 kg/am2 or less than the inner mold for injection molding the outer layer by 3°. there were. In addition, cracks had occurred in the outer layer 1.
之Δ匠主
内層の厚みを２．０ｍｍに設定し、外層の加熱温度を常
温（１０’Ｃ）とした以外は、実施例１と同様にして多
層管継手を得た。A multilayer pipe joint was obtained in the same manner as in Example 1, except that the thickness of the main inner layer was set to 2.0 mm and the heating temperature of the outer layer was set to room temperature (10'C).
得られた多層管継手の内外層間の密着強度を測定したと
ころ５０にｇ／ｃ＋ｓ２以下であった。また、多層管継
手は１０個の１個の割合でその外層に割れを生じていた
。The adhesion strength between the inner and outer layers of the obtained multilayer pipe joint was measured and found to be 50 g/c+s2 or less. Furthermore, one in ten multilayer pipe joints had cracks in their outer layer.
（発明の効果）
本発明は、加熱した外層を成形金型に組み込んで内層用
成形材料を射出するので、外層にクラックを生じること
なく多層管継手を得ることができる。従って、外層が補
強繊維で補強されている多層管継手や内層の厚みの薄い
多層管継手でも支障なく製造することができる。(Effects of the Invention) In the present invention, the heated outer layer is assembled into a molding die and the molding material for the inner layer is injected, so that a multilayer pipe joint can be obtained without cracking the outer layer. Therefore, even a multilayer pipe joint whose outer layer is reinforced with reinforcing fibers or a multilayer pipe joint whose inner layer is thin can be manufactured without any problem.
４、・ｒの８ な説明
第１図（ａ）〜（ｅ）は本発明の多層管継手の製造方法
の一実施例を示す概略図、第２図は多層管継手の他の実
施例の断面図である。4.・r-8 Explanation FIGS. 1(a) to (e) are schematic diagrams showing one embodiment of the method for manufacturing a multilayer pipe joint of the present invention, and FIG. 2 is a schematic diagram showing another embodiment of the multilayer pipe joint manufacturing method of the present invention. FIG.
１・・・外層、２・・・内層、３・・・外層射出成形用
外金型、４・・・加熱手段、５・・・内層射出成形用内
金型、Ａ・・・多層管継手、３′・・・外層射出成形用
内金型。DESCRIPTION OF SYMBOLS 1... Outer layer, 2... Inner layer, 3... Outer mold for outer layer injection molding, 4... Heating means, 5... Inner mold for inner layer injection molding, A... Multilayer pipe joint , 3'...Inner mold for outer layer injection molding.
以上that's all
Claims (1)
加熱する工程と、 前記加熱された外層を内層射出成形用金型に組み込む工
程と、 前記外層の内周側に円筒状の内層を射出成形する工程と
、 を包含する多層管継手の製造方法。[Claims] 1. Step of injection molding a cylindrical outer layer; Step of taking out the outer layer from the mold and heating the outer layer to an extent that the outer layer is not deformed; and Inserting the heated outer layer into a mold for inner layer injection molding. A method for producing a multilayer pipe joint, the method comprising the steps of: incorporating a cylindrical inner layer into the inner peripheral side of the outer layer; and injection molding a cylindrical inner layer on the inner peripheral side of the outer layer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25095989A JPH0741628B2 (en) | 1989-09-27 | 1989-09-27 | Manufacturing method of multilayer pipe joint |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25095989A JPH0741628B2 (en) | 1989-09-27 | 1989-09-27 | Manufacturing method of multilayer pipe joint |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH03112619A true JPH03112619A (en) | 1991-05-14 |
| JPH0741628B2 JPH0741628B2 (en) | 1995-05-10 |
Family
ID=17215559
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP25095989A Expired - Lifetime JPH0741628B2 (en) | 1989-09-27 | 1989-09-27 | Manufacturing method of multilayer pipe joint |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0741628B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2017007289A (en) * | 2015-06-25 | 2017-01-12 | 東洋紡株式会社 | Pipe molding and method for manufacturing the same |
-
1989
- 1989-09-27 JP JP25095989A patent/JPH0741628B2/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2017007289A (en) * | 2015-06-25 | 2017-01-12 | 東洋紡株式会社 | Pipe molding and method for manufacturing the same |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0741628B2 (en) | 1995-05-10 |
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