JP2011127712A

JP2011127712A - Synthetic resin pipe and method of manufacturing the same

Info

Publication number: JP2011127712A
Application number: JP2009287695A
Authority: JP
Inventors: Akio Nagayoshi; 昭夫永吉; Seiji Nagayoshi; 清治永吉
Original assignee: Evuc Co Ltd
Current assignee: Evuc Co Ltd
Priority date: 2009-12-18
Filing date: 2009-12-18
Publication date: 2011-06-30
Anticipated expiration: 2029-12-18
Also published as: JP5457162B2

Abstract

<P>PROBLEM TO BE SOLVED: To provide a synthetic resin pipe for a joint for connecting a drain port and a drain pipe, capable of integrally connecting an inner peripheral surface of both ends thereof to the drain port and drain pipe with adhesive and enduring a long time use, which is made of a hard vinyl chloride resin. <P>SOLUTION: Both ends of a pipe body 1 made of an olefin group resin and having a certain length of flexibility are provided with joint ports 2 and 2 respectively including: an inner peripheral layer 2A formed of a short cylinder made of a hard vinyl chloride resin; and an outer peripheral layer 2B formed of a soft olefin group resin coating layer. The inner peripheral layer 2A, which is formed of the short cylinder made of the hard vinyl chloride resin, of the joint port 2 is integrally connected to the drain port and the drain pipe made of the same material as the inner peripheral layer 2A by using an adhesive. With this structure, the synthetic resin pipe can be used for a long time without using a soft vinyl chloride resin easy to be deteriorated by elusion of a solvent. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

本発明は両端部に継手口を一体に設けている可撓性を有する合成樹脂管とその製造方法に関する関するものである。 The present invention relates to a flexible synthetic resin pipe having joint ports integrally provided at both ends and a method for manufacturing the same.

従来から、台所の流し台等の排水口を排水管等に接続するための継手用合成樹脂管としては、例えば、特許文献１に記載されているように、一定長さを有する軟質塩化ビニル樹脂製又は軟質ポリエチレン樹脂製の管体の両端部に、この管体と同一材料よりなる内外周面が平坦な円筒形状の継手部を一体に設けていると共にこれらの継手部間の管体外周面に硬質合成樹脂製補強材を一定のピッチでもって螺旋状に巻着してなる合成樹脂管や、特許文献２に記載されているように、一定長さを有する軟質合成樹脂製ホース主体の外周面に硬質合成樹脂製線材を螺旋状に巻着することによって補強螺旋条体を設けていると共にこのホース主体の両端部にこのホース主体と同じ材料よりなる内外周面が平滑面に形成された短筒形状の軟質合成樹脂製継手部を一体に設けてなる軟質合成樹脂製ホースが開発されている。 Conventionally, as a synthetic resin pipe for a joint for connecting a drain outlet of a kitchen sink or the like to a drain pipe or the like, for example, as described in Patent Document 1, it is made of a soft vinyl chloride resin having a certain length. Alternatively, a cylindrical joint portion having a flat inner and outer peripheral surface made of the same material as that of the tube body is integrally provided at both ends of the tube body made of soft polyethylene resin, and the tube outer peripheral surface between these joint portions is provided. A synthetic resin pipe formed by spirally winding a hard synthetic resin reinforcing material at a constant pitch, or an outer peripheral surface of a soft synthetic resin hose mainly having a certain length as described in Patent Document 2. A hard synthetic resin wire rod is spirally wound around the hose main body and the inner and outer peripheral surfaces made of the same material as the hose main body are formed on both ends of the hose main body on a smooth surface. Tubular soft synthetic resin joint Soft synthetic resin hose made integrally provided has been developed parts.

また、上記特許文献２には、両端部に軟質合成樹脂製継手部を有する軟質合成樹脂製ホースの製造方法として、成形回転軸上に半溶融状態の軟質合成樹脂製帯状材を重合、融着させながら螺旋巻きすると共に重合部間に半溶融状態の硬質合成樹脂製線材を介入させることにより補強螺旋突条を形成した一定長さの可撓性を有する軟質合成樹脂製ホース主体を形成していく工程と、このホース主体の形成工程に引き続いて上記半溶融状態の軟質合成樹脂製帯状材を肉厚に成形する一方、硬質合成樹脂製線材を極細に成形しながら螺旋状に巻回することよりこの極細硬質合成樹脂製線材を埋設した一定長さの軟質合成樹脂製筒体部を形成する工程とを順次、繰り返し行い、さらに、軟質合成樹脂製筒体部をその長さ方向の中央部から分断して両端部にこの軟質合成樹脂製筒体部の分割片からなる軟質合成樹脂製継手部を有する一定長のホース主体を得ることが記載されている。 Further, in Patent Document 2, as a method for producing a soft synthetic resin hose having soft synthetic resin joints at both ends, a semi-molten soft synthetic resin strip is polymerized and fused on a rotating shaft. A flexible synthetic resin hose main body having a certain length of flexibility is formed by interposing a semi-molten hard synthetic resin wire between the polymerized portions while spirally winding the wire. Following this process and the hose-based forming process, the above-mentioned semi-molten soft synthetic resin strip is formed thick, while the hard synthetic resin wire is spirally wound while being formed into an extremely thin shape. The step of forming a soft synthetic resin cylindrical body portion having a fixed length in which the ultrafine hard synthetic resin wire material is embedded is sequentially repeated, and the soft synthetic resin cylindrical body portion is further arranged at the center in the length direction. Split from both ends It has been described that in order to obtain a constant length of the hose main body having made soft synthetic resin joint comprising a divided piece of the soft synthetic resin-made cylindrical body portion.

特開２００３−２１４５６３号公報JP 2003-214563 A 特開２００３−１５４５７２号公報JP 2003-154572 A

上記可撓性を有する合成樹脂管や軟質合成樹脂製ホースによれば、接続すべき排水口と排水管との対向する開口端部が管軸線上に対して互いにずれていても、両端継手部がこれらの開口端部にそれぞれ接続可能に管を屈曲させることができて精度のよい施工が可能となるが、接続すべき排水口や排水管等は一般に硬質塩化ビルニ樹脂よりなるものであるからこのような排水管に接続すべき継手部がオレフィン系樹脂よりなると接着不能となって接続することができないといった問題点がある。 According to the flexible synthetic resin tube or the soft synthetic resin hose, the joints at both ends can be connected even if the opening ends facing the drain port and the drain tube to be connected are displaced from each other with respect to the tube axis. However, it is possible to bend the pipes so that they can be connected to these open ends, respectively, and it is possible to perform construction with high accuracy. However, the drain outlets and drain pipes to be connected are generally made of hard virgin chloride resin. When the joint part to be connected to such a drain pipe is made of an olefin resin, there is a problem in that it cannot be bonded and cannot be connected.

一方、上記合成樹脂管や軟質合成樹脂製ホースが塩化ビニル樹脂よりなる場合には、上記硬質塩化ビニル樹脂製排水管等の外周面にその軟質合成樹脂よりなる継手部を被嵌させて一体に接着することができるが、管体やホース主体と共に両端継手部を軟質塩化ビニル樹脂より形成すると、溶剤が溶出して管体やホース主体が短期間で劣化するといった問題点が生じる。 On the other hand, when the synthetic resin pipe or the soft synthetic resin hose is made of vinyl chloride resin, the joint portion made of the soft synthetic resin is fitted on the outer peripheral surface of the hard vinyl chloride resin drain pipe or the like. Although both ends can be bonded together, the joints of both ends together with the main body of the tube and the hose are formed of a soft vinyl chloride resin, which causes a problem that the main body of the tube and the hose are deteriorated in a short period of time due to the dissolution of the solvent.

また、上記特許文献２に記載されている軟質合成樹脂製ホースの製造方法では、ホース主体から継手部に至るまで同一材料によって形成されたホースしか製造することができず、継手部の内外層を異種の合成樹脂材によって形成することができないといった問題点がある。 Moreover, in the manufacturing method of the soft synthetic resin hose described in the said patent document 2, only the hose formed with the same material can be manufactured from the hose main body to a joint part, and the inner and outer layers of a joint part are manufactured. There is a problem that it cannot be formed of different kinds of synthetic resin materials.

本発明はこのような問題点に鑑みてなされたもので、その目的とするところは、継手部を硬質塩化ビニル樹脂製排水管等に容易に接着でき、且つ、長期の使用に供することができる両端部に継手口を設けている合成樹脂管と、この合成樹脂管を能率よく製造することができる製造方法を提供するにある。 The present invention has been made in view of such problems, and the object of the present invention is that the joint portion can be easily bonded to a drain pipe made of hard vinyl chloride resin or the like and can be used for a long time. It is in providing the synthetic resin pipe | tube which provided the joint port in both ends, and the manufacturing method which can manufacture this synthetic resin pipe | tube efficiently.

上記目的を達成するために本発明の合成樹脂管は、請求項１に記載したように、軟質オレフィン系樹脂よりなる可撓性を有する管主体の両端部に継手口を設けている合成樹脂管であって、少なくとも一方の継手口の内周層を内周面が平滑な面に形成されている硬質塩化ビニル樹脂製短筒によって形成し、この継手口の外周層を上記管主体を形成している軟質オレフィン系樹脂によって形成していることを特徴とする。 In order to achieve the above object, the synthetic resin pipe of the present invention is a synthetic resin pipe provided with joint ports at both ends of a flexible pipe main body made of a soft olefin resin as described in claim 1. The inner peripheral layer of at least one joint port is formed by a short tube made of hard vinyl chloride resin having a smooth inner peripheral surface, and the outer peripheral layer of the joint port is formed of the pipe main body. It is characterized by being formed with the soft olefin resin which is.

このように構成した合成樹脂管において、請求項２に係る発明は、上記硬質塩化ビニル樹脂製短筒からなる継手口内周層の内径を管主体の内径と同径に形成していることを特徴とし、請求項３に係る発明は、その内径を管主体の内径よりも大径に形成していることを特徴とする。また、請求項４に係る発明は、上記可撓性を有する管主体において、その両端継手口の内周層を硬質塩化ビニル樹脂製短筒によって形成していることを特徴とする。 In the synthetic resin pipe constructed as described above, the invention according to claim 2 is characterized in that the inner diameter of the inner peripheral layer of the joint port made of the short tube made of hard vinyl chloride resin is formed to be the same as the inner diameter of the pipe main body. The invention according to claim 3 is characterized in that its inner diameter is formed larger than the inner diameter of the tube main body. The invention according to claim 4 is characterized in that, in the flexible pipe main body, the inner peripheral layer of the joint opening at both ends is formed of a short tube made of hard vinyl chloride resin.

さらに、請求項５に係る発明は、軟質オレフィン系樹脂からなる上記管主体の両端部を内周層の外周面に被覆することによって外周面が平滑な継手口の外周層を形成していると共に、両端継手口間の管主体の外周面に硬質合成樹脂製線材からなる補強螺旋突条を設けていることを特徴とする。 Furthermore, the invention according to claim 5 forms the outer peripheral layer of the joint port having a smooth outer peripheral surface by covering the outer peripheral surface of the inner peripheral layer with both ends of the tube main body made of the soft olefin resin. In addition, a reinforcing spiral ridge made of a hard synthetic resin wire is provided on the outer peripheral surface of the tube main body between the joint ends at both ends.

請求項６に係る発明は、この請求項５に記載の合成樹脂管において、内周層を形成している上記硬質塩化ビニル樹脂製短筒の外周面に複数条の係止突条を突設してあり、この係止突条を軟質オレフィン系樹脂からなる外周層の内周面に食い込ませてこれらの内周層と外周層とを一体に結合させていることを特徴とし、請求項７に係る発明は、内周層を形成している硬質塩化ビニル樹脂製短筒の外周面に複数の係止凹部を設けて、この係止凹部内に軟質オレフィン系樹脂からなる外周層の内周部を係止させてこれらの内周層と外周層とを一体に結合させていることを特徴とする。 The invention according to claim 6 is the synthetic resin pipe according to claim 5, wherein a plurality of locking protrusions are provided on the outer peripheral surface of the rigid polyvinyl chloride resin short cylinder forming the inner peripheral layer. The engaging protrusions are bitten into the inner peripheral surface of the outer peripheral layer made of a soft olefin resin, and the inner peripheral layer and the outer peripheral layer are integrally bonded, and The invention according to the present invention provides a plurality of locking recesses on the outer peripheral surface of a rigid polyvinyl chloride resin short tube forming an inner peripheral layer, and the inner periphery of the outer peripheral layer made of a soft olefin resin in the locking recess. The inner peripheral layer and the outer peripheral layer are integrally coupled by locking the portions.

請求項８に係る発明は、上記外周層を外周面が全長に亘って同一径の平滑面に形成している硬質塩化ビニル樹脂からなる円筒状被覆層によって被覆していることを特徴とする。 The invention according to claim 8 is characterized in that the outer peripheral layer is covered with a cylindrical covering layer made of a hard vinyl chloride resin whose outer peripheral surface is formed on a smooth surface having the same diameter over the entire length.

請求項９に係る発明は、上記合成樹脂管の製造方法であって、成形回転軸上に半溶融状態の軟質オレフィン系樹脂製帯状材を対向する側端部を重合、融着させながら螺旋巻きすると共にこの軟質オレフィン系樹脂製帯状材上に硬質合成樹脂製線材を一定のピッチでもって螺旋状に巻着することにより管主体を形成し、所定長さの管主体が形成される毎にこの管主体の成形個所に向かって成形回転軸上を通じて外周面に複数の係止突条を突設している硬質塩化ビニル樹脂製短筒部材を順次送り込んでこの硬質塩化ビニル樹脂製短筒部材上に上記半溶融状態の軟質オレフィン系樹脂製帯状材を螺旋巻きすることにより一定厚みの軟質オレフィン系樹脂被覆層を形成すると共にこの軟質オレフィン系樹脂被覆層内に上記硬質合成樹脂製線材を埋設させることによって該軟質オレフィン系樹脂被覆層の外周面を平滑な面に形成し、しかるのち、この軟質オレフィン系樹脂被覆層で被覆された硬質塩化ビニル樹脂製短筒部材の長さ方向の中央部を切断することにより、一定長さの管主体の両端部に内周層が上記硬質塩化ビニル樹脂製短筒部材の分割片からなる硬質塩化ビニル樹脂製短筒によって形成され、外周層が上記分割された軟質オレフィン系樹脂被覆層によって形成された継手口を設けている合成樹脂管を順次製造することを特徴とする。 The invention according to claim 9 is the method for manufacturing the synthetic resin pipe, wherein the semi-molten soft olefin resin strip is spirally wound while polymerizing and fusing the opposite end portions on the molding rotating shaft. At the same time, a tube main body is formed by winding a hard synthetic resin wire rod on the soft olefin-based resin band in a spiral shape at a constant pitch, and each time a tube main body of a predetermined length is formed, A rigid polyvinyl chloride resin short cylinder member having a plurality of locking protrusions projecting from the outer peripheral surface through the molding rotation shaft toward the tube-forming part is sequentially fed onto the rigid polyvinyl chloride resin short cylinder member. A soft olefinic resin coating layer having a certain thickness is formed by spirally winding the semi-molten soft olefinic resin strip, and the hard synthetic resin wire is embedded in the soft olefinic resin coating layer. Thus, the outer peripheral surface of the soft olefin resin coating layer is formed into a smooth surface, and then the central portion in the length direction of the rigid polyvinyl chloride resin short tube member coated with the soft olefin resin coating layer. The inner peripheral layer is formed by the hard vinyl chloride resin short tube made of the divided pieces of the hard vinyl chloride resin short tube member at both ends of the tube main body of a certain length, and the outer peripheral layer is divided by the above-mentioned A synthetic resin pipe provided with a joint port formed by the soft olefin-based resin coating layer is manufactured sequentially.

このように構成した合成樹脂管の製造方法において、請求項10に係る発明は、硬質塩化ビニル樹脂製短筒部材を円筒形状の継手部成形部材上に抜き取り可能に被せた状態で管主体の形成個所に送り込み、この硬質塩化ビニル樹脂製短筒部材に半溶融状態の軟質オレフィン系樹脂製帯状材を螺旋巻きすることにより一定厚みの軟質オレフィン系樹脂被覆層を形成し、この軟質オレフィン系樹脂被覆層で被覆された硬質塩化ビニル樹脂製短筒部材の長さ方向の中央部を切断したのちその切断口から上記継手部成形部材を引き抜くことにより、一定長さの管主体の両端部に内周層が上記硬質塩化ビニル樹脂製短筒部材の分割片からなり且つ内径が管主体の内径よりも大径に形成された硬質塩化ビニル樹脂製短筒によって形成され、外周層が上記分割された軟質オレフィン系樹脂被覆層によって形成された継手口を設けることを特徴とする。 In the synthetic resin pipe manufacturing method configured as described above, the invention according to claim 10 is characterized in that the pipe main body is formed in a state in which a short tube member made of hard vinyl chloride resin is detachably covered on a cylindrical joint portion molding member. A soft olefin resin coating layer of a certain thickness is formed by spirally winding a semi-molten soft olefin resin strip around this rigid polyvinyl chloride resin short tube member. After cutting the central portion in the length direction of the short tubular member made of hard polyvinyl chloride resin covered with a layer, the joint molded member is pulled out from the cut port, so that the inner circumference is attached to both ends of the tube main body of a certain length. The layer is made of a hard vinyl chloride resin short cylinder made of a split piece of the hard vinyl chloride resin short cylinder member, and the inner diameter is larger than the inner diameter of the tube main body, and the outer peripheral layer is divided. And providing a coupling hole formed by a soft olefin resin coating layer.

請求項１に係る発明によれば、可撓性を有する合成樹脂管主体の両端継手口における少なくとも一方の継手口の内周層を内周面が平滑面に形成されている硬質塩化ビニル樹脂製短筒によって形成しているので、この硬質塩化ビニル樹脂製短管からなる内周層を硬質塩化ビニル樹脂製の排水口や排水管の開口端部に被嵌させて接着剤等により簡単且つ確実に接続することができ、その上、管主体と継手口の外周層とは軟質オレフィン系樹脂からなると共に継手口の内周層は上述したように、溶剤の溶出等が生じることのない硬質の塩化ビニル樹脂よりなるから、長期に亘って使用することができる合成樹脂管を提供することができる。 According to the first aspect of the present invention, the inner peripheral layer of at least one joint port in the both-end joint port mainly composed of a flexible synthetic resin pipe is made of a hard polyvinyl chloride resin having a smooth inner surface. Since it is formed by a short cylinder, the inner peripheral layer consisting of this rigid polyvinyl chloride resin short pipe is fitted into the rigid vinyl chloride resin drainage outlet or drain pipe opening end, and it is easy and reliable with an adhesive or the like. In addition, the pipe main body and the outer peripheral layer of the joint port are made of a soft olefin-based resin, and the inner peripheral layer of the joint port is a hard material that does not cause solvent elution as described above. Since it consists of a vinyl chloride resin, the synthetic resin pipe | tube which can be used over a long term can be provided.

この合成樹脂管における上記継手口の内周層を形成している硬質塩化ビニル樹脂製短管の内径を請求項２に記載したように、管主体の内径と同径に形成しておいてもよいが、請求項３に係る発明によれば、その内径を管主体の内径よりも大径に形成しているので、接続すべき排水管等の開口端部をこの継手口内に挿嵌して接続した場合、該排水管の内周面とこの合成樹脂管の内周面との間に大きな段差を生じさせることなく略面一状に連続させた接続構造とすることができる。なお、内周層を硬質塩化ビニル樹脂製短管によって形成している継手口を、請求項４に記載したように、管主体の両端部に設けおくことが望ましい。 Even if the inner diameter of the short pipe made of hard vinyl chloride resin forming the inner peripheral layer of the joint port in this synthetic resin pipe is set to the same diameter as the inner diameter of the pipe main body as described in claim 2. However, according to the invention according to claim 3, since the inner diameter is formed larger than the inner diameter of the pipe main body, the opening end portion of the drain pipe to be connected is inserted into the joint port. In the case of connection, a connection structure in which the drain pipe and the inner peripheral surface of the drain pipe and the inner peripheral surface of the synthetic resin pipe are connected to each other without causing a large level difference can be obtained. In addition, as described in claim 4, it is desirable to provide joint ports in which the inner peripheral layer is formed of a short pipe made of hard vinyl chloride resin at both ends of the pipe main body.

請求項５に係る発明によれば、上記両端継手口間の管主体の外周面に硬質合成樹脂製線材からなる補強螺旋突条を設けているので、軟質オレフィン系樹脂よりなる管主体を屈曲させても圧潰変形することなく断面円形状に保持しておくことができ、従って、排水等が円滑に行わせることができる配管施工が可能となる。 According to the fifth aspect of the invention, since the reinforcing spiral ridge made of the hard synthetic resin wire is provided on the outer peripheral surface of the pipe main body between the joint ends at both ends, the pipe main body made of the soft olefin resin is bent. However, it can be held in a circular cross section without being crushed and deformed, and therefore piping construction that allows smooth drainage and the like is possible.

さらに、請求項６に係る発明によれば、内周層を形成している上記硬質塩化ビニル樹脂製短筒の外周面に複数条の係止突条を突設し、この係止突条を軟質オレフィン系樹脂からなる外周層の内周面に食い込ませているので、硬質塩化ビニル樹脂製短筒と軟質オレフィン系樹脂からなる外周層とは接着することができないにもかかわらず、両者を確実且つ強固に一体化させることができ、軟質オレフィン系樹脂よりなる管主体を硬質塩化ビニル樹脂よりなる排水管等に接続させることができる。同様に、請求項７に係る発明によれば、内周層を形成している硬質塩化ビニル樹脂製短筒の外周面に複数の係止凹部を設けてあり、この係止凹部内に軟質オレフィン系樹脂からなる外周層の内周部を係止させてこれらの内周層と外周層とを一体に結合させているので、硬質塩化ビニル樹脂製短筒と軟質オレフィン系樹脂からなる外周層とは接着することができないにもかかわらず、両者を確実且つ強固に一体化させることができる。 Further, according to the invention of claim 6, a plurality of locking ridges are provided on the outer peripheral surface of the hard vinyl chloride resin short cylinder forming the inner peripheral layer, and the locking ridges are Because the inner surface of the outer peripheral layer made of soft olefin resin is bitten, the short tube made of hard vinyl chloride resin and the outer peripheral layer made of soft olefin resin cannot be bonded, but both are securely Moreover, it can be firmly integrated, and a pipe main body made of a soft olefin resin can be connected to a drain pipe made of a hard vinyl chloride resin. Similarly, according to the invention according to claim 7, a plurality of locking recesses are provided on the outer peripheral surface of the short tube made of hard vinyl chloride resin forming the inner peripheral layer, and the soft olefin is provided in the locking recesses. Since the inner peripheral portion of the outer peripheral layer made of a plastic resin is locked and the inner peripheral layer and the outer peripheral layer are integrally bonded, the short cylinder made of hard vinyl chloride resin and the outer peripheral layer made of a soft olefin resin Although they cannot be bonded, they can be reliably and firmly integrated.

請求項８に係る発明によれば、上記軟質オレフィン系樹脂からなる外周層の外周面を全長に亘って同一径の平滑面に形成している硬質塩化ビニル樹脂からなる円筒状被覆層によって被覆しているので、上記硬質塩化ビニル樹脂製短管からなる内周層と同様に、この円筒状被覆層を硬質塩化ビニル樹脂製の排水口や排水管の開口端部に挿嵌させて接着剤等により簡単且つ確実に接続することができる。 According to the invention which concerns on Claim 8, it coat | covers with the cylindrical coating layer which consists of the hard vinyl chloride resin which forms the outer peripheral surface of the outer peripheral layer which consists of said soft olefin resin in the smooth surface of the same diameter over the full length. Therefore, like the inner peripheral layer made of the hard vinyl chloride resin short tube, this cylindrical covering layer is inserted into the hard vinyl chloride resin drainage port or the drain pipe open end, and adhesives etc. This makes it possible to connect easily and reliably.

また、上記合成樹脂管の製造方法によれば、請求項９に記載したように、まず、成形回転軸上に半溶融状態の軟質オレフィン系樹脂製帯状材を螺旋状に巻回し、且つ、この軟質オレフィン系樹脂製帯状材上に硬質合成樹脂製線材を一定のピッチでもって螺旋状に巻着することにより管主体を形成しながら、この管主体の形成位置に向かって成形回転軸の基端側から、この成形回転軸上を摺動させながら外周面に複数の係止突条又は係止凹部を設けている硬質塩化ビニル樹脂製短筒部材を順次送り込んでこの硬質塩化ビニル樹脂製短筒部材上に上記半溶融状態の軟質オレフィン系樹脂製帯状材を螺旋巻きすることにより一定厚みの軟質オレフィン系樹脂被覆層を形成するので、この軟質オレフィン系樹脂被覆層と硬質塩化ビニル樹脂製短筒部材とを硬質塩化ビニル樹脂製短筒部材の外周面に設けている係止突条又は係止凹部によって簡単且つ確実に一体化させることができる。 Further, according to the method for producing a synthetic resin tube, as described in claim 9, first, a semi-molten soft olefin resin strip-like material is spirally wound on a molding rotating shaft, and this While forming a tube main body by winding a hard synthetic resin wire rod on a soft olefin-based resin strip in a spiral shape with a constant pitch, the base end of the molding rotation shaft toward the tube main body formation position This rigid polyvinyl chloride resin short cylinder is sequentially fed from the side by sliding hard vinyl chloride resin short cylinder members provided with a plurality of locking protrusions or locking recesses on the outer peripheral surface while sliding on the molding rotating shaft. A soft olefin resin coating layer having a certain thickness is formed by spirally winding the above-mentioned semi-molten soft olefin resin strip on the member, so that this soft olefin resin coating layer and a rigid polyvinyl chloride resin short tube Element It is possible to easily and reliably integrated by stopping projections or locking recesses are provided on the outer peripheral surface of the hard vinyl chloride resin short tube member.

しかるのち、上記軟質オレフィン系樹脂被覆層内に上記硬質合成樹脂製線材を埋設させることによって該軟質オレフィン系樹脂被覆層の外周面を平滑な面に形成したのち、該軟質オレフィン系樹脂被覆層を硬化させ、引き続いてこの軟質オレフィン系樹脂被覆層で被覆された硬質塩化ビニル樹脂製短筒部材の長さ方向の中央部を切断するものであるから、一定長さの管主体の両端部に硬質塩化ビニル樹脂製短筒部材の分割片からなる内周層と、この内周層の外周面に係止突条又は係止凹部を介して強固に一体化したオレフィン系樹脂被覆層からなる外周層とを備えた継手口を有する合成樹脂管を順次、能率よく製造することができる。 After that, by embedding the hard synthetic resin wire in the soft olefin resin coating layer, the outer peripheral surface of the soft olefin resin coating layer is formed into a smooth surface, and then the soft olefin resin coating layer is formed. Hardened, and then cuts the central portion in the length direction of the short tube member made of hard vinyl chloride resin coated with this soft olefin resin coating layer. An inner peripheral layer composed of divided pieces of a short tube member made of vinyl chloride resin, and an outer peripheral layer composed of an olefin-based resin coating layer firmly integrated with the outer peripheral surface of the inner peripheral layer via a locking protrusion or a locking recess A synthetic resin pipe having a joint opening provided with can be sequentially and efficiently manufactured.

さらに、請求項１０に係る発明によれば、請求項９に記載の合成樹脂管の製造方法において、硬質塩化ビニル樹脂製短筒部材を円筒形状の継手部成形部材上に抜き取り可能に被せた状態で管主体の形成個所に送り込み、この硬質塩化ビニル樹脂製短筒部材に半溶融状態の軟質オレフィン系樹脂製帯状材を螺旋巻きすることにより一定厚みの軟質オレフィン系樹脂被覆層を形成し、この軟質オレフィン系樹脂被覆層で被覆された硬質塩化ビニル樹脂製短筒部材の長さ方向の中央部を切断したのちその切断口から上記継手部成形部材を引き抜くので、一定長さの管主体の両端部に、内周層が上記硬質塩化ビニル樹脂製短筒部材の分割片からなり且つ内径が管主体の内径よりも大径に形成された硬質塩化ビニル樹脂製短筒によって形成され、外周層が上記分割された軟質オレフィン系樹脂被覆層によって形成された継手口を有する合成樹脂管を能率よく製造することかできる。 Furthermore, according to the invention which concerns on Claim 10, in the manufacturing method of the synthetic resin pipe | tube of Claim 9, the state which covered the short cylindrical member made from a hard vinyl chloride resin on the cylindrical joint part shaping | molding member so that extraction was possible The tube is fed to the formation center of the tube main body, and a soft olefin resin coating layer having a constant thickness is formed by spirally winding a semi-molten soft olefin resin strip around the rigid polyvinyl chloride resin short tube member. After cutting the central portion in the length direction of the short tube member made of hard vinyl chloride resin coated with the soft olefin resin coating layer, the joint part molding member is pulled out from the cut port, so both ends of the pipe main body of a certain length The inner peripheral layer is formed of a hard vinyl chloride resin short cylinder formed of a divided piece of the hard vinyl chloride resin short cylinder member and having an inner diameter larger than the inner diameter of the tube main body. It can either be manufactured with good efficiency synthetic resin tube having the divided joint opening formed by a soft olefin resin coating layer.

本発明合成樹脂管の要部を断面した側面図。The side view which cut the principal part of this invention synthetic resin pipe | tube. その製造方法を説明するための簡略縦断側面図。The simplified vertical side view for demonstrating the manufacturing method. 継手口の内径が大径の合成樹脂管の要部を断面した側面図。The side view which cut the principal part of the synthetic resin pipe | tube with the large internal diameter of a joint port. その製造方法を説明するための簡略縦断側面図。The simplified vertical side view for demonstrating the manufacturing method. 本発明合成樹脂管の変形例を示す要部を断面した側面図。The side view which cut the principal part which shows the modification of this invention synthetic resin pipe | tube. 本発明合成樹脂管の別な変形例を示す要部を断面した側面図。The side view which cut the principal part which shows another modification of this invention synthetic resin pipe | tube. 本発明合成樹脂管のさらに別な変形例を示す要部を断面した側面図。The side view which cut the principal part which shows another modification of this invention synthetic resin pipe | tube.

次に、本発明の具体的な実施の形態を図面について説明すると、図１は、一定長さを有する可撓性を有する管主体１の両端部に剛直性を有する一定長さの継手口２、２を設けてなる合成樹脂管であって、管主体１はポリエチレン又はポリプロピレン等の軟質オレフィン系樹脂よりなり、継手口２、２は、管主体１の内径と略同一内径を有する硬質塩化ビニル樹脂製短筒からなる内周層2Aの外周面に軟質オレフィン系樹脂からなる一定厚みの外周層2Bを被着してなるものである。さらに、継手口２の内周層2Aの外周面、即ち、この内周層2Aを形成している硬質塩化ビニル樹脂製短筒の外周面には、周方向に長い複数条の係止突条３を管主体１の長さ方向に連続又は所望間隔毎に形成してあり、この係止突条３を上記外周層2Bの内面に食い込ませて外周層2Bが接着困難なオレフィン系樹脂からなるにもかかわらず、硬質塩化ビニル樹脂製短筒からなる内周層2Aをこの外周層2Bの内周面に一体に結合、固着している。また、継手口２の内周層2Aの内周面は全長に亘って平滑な面に形成されていると共にこの内周面を管主体１の内周面に長さ方向に面一状に連続させている。 Next, a specific embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows a fixed-length joint port 2 having rigidity at both ends of a flexible pipe main body 1 having a fixed length. 2, the pipe main body 1 is made of a soft olefin resin such as polyethylene or polypropylene, and the joint ports 2 and 2 are hard vinyl chlorides having an inner diameter substantially the same as the inner diameter of the pipe main body 1. The outer peripheral layer 2B made of a soft olefin resin is attached to the outer peripheral surface of the inner peripheral layer 2A made of a resin short cylinder. Further, on the outer peripheral surface of the inner peripheral layer 2A of the joint port 2, that is, on the outer peripheral surface of the short tube made of hard vinyl chloride resin forming the inner peripheral layer 2A, a plurality of locking protrusions that are long in the circumferential direction are provided. 3 is formed in the length direction of the tube main body 1 or at every desired interval, and the locking ridge 3 is made to bite into the inner surface of the outer peripheral layer 2B so that the outer peripheral layer 2B is made of an olefin resin that is difficult to adhere. Nevertheless, the inner peripheral layer 2A made of a short tube made of hard vinyl chloride resin is integrally bonded and fixed to the inner peripheral surface of the outer peripheral layer 2B. Further, the inner peripheral surface of the inner peripheral layer 2A of the joint port 2 is formed to be a smooth surface over the entire length, and this inner peripheral surface is continuously flush with the inner peripheral surface of the pipe main body 1 in the length direction. I am letting.

可撓性を有する管主体１は、内周面を全長に亘って同一径の平滑な面に形成されている軟質オレフィン系樹脂よりなる管壁1aの外周面に硬質塩化ビニル樹脂又は硬質ポリエチレン樹脂等の硬質合成樹脂製線材からなる補強螺旋突条４を一定のピッチでもって螺旋巻きしていると共にこの補強螺旋突条４の軟質オレフィン系樹脂からなる中空螺旋突条1bによって被覆してあり、軟質オレフィン系樹脂からなる管壁1aの両端を上記継手口２、２における軟質オレフィン系樹脂からなる外周層2Bの基端に連続させている。なお、上記補強螺旋突条４は管壁1aの両端から極細に形成されて継手口２の外周層2B内に埋設させてあり、継手口２の外周層2Bの外周面は全長に亘って同一径の平滑な面に形成されている。 The flexible tube main body 1 has a hard vinyl chloride resin or a hard polyethylene resin on the outer peripheral surface of a tube wall 1a made of a soft olefin resin formed on a smooth surface having the same diameter over the entire inner peripheral surface. The reinforcing spiral ridge 4 made of a hard synthetic resin wire such as the above is spirally wound at a constant pitch and is covered with a hollow spiral ridge 1b made of a soft olefin resin of the reinforcing spiral ridge 4; Both ends of the tube wall 1a made of a soft olefin resin are connected to the base end of the outer peripheral layer 2B made of a soft olefin resin at the joint ports 2 and 2. The reinforcing spiral ridge 4 is formed very thin from both ends of the tube wall 1a and is embedded in the outer peripheral layer 2B of the joint port 2. The outer peripheral surface of the outer peripheral layer 2B of the joint port 2 is the same over the entire length. It is formed on a smooth surface.

このように構成した合成樹脂管は、硬質合成樹脂よりなる排水口（図示せず）と排水管（図示せず）、又は、硬質塩化ビニル樹脂製排水管同士を接続するための継手用合成樹脂管として使用され、例えば、排水口と排水管と対向開口端部間を接続する場合には、管主体１の両端継手口２、２における硬質合成樹脂製短筒からなる内周層2A、2Aをそれぞれ排水口と排水管の開口端部とに被嵌し、内周層2Aの内周面に塗布した接着剤、又は排水口の外周面と排水管の開口端の外周面に塗布した接着剤によって両端継手口２、２を排水口と排水管とにそれぞれ固着することができる。 The synthetic resin pipe constructed as described above is a joint synthetic resin for connecting a drain outlet (not shown) and a drain pipe (not shown) made of a hard synthetic resin, or hard vinyl chloride resin drain pipes. Used as a pipe, for example, when connecting between a drain outlet, a drain pipe, and opposite opening ends, inner peripheral layers 2A, 2A made of rigid synthetic resin short cylinders at both end joint openings 2, 2 of the pipe main body 1 Is applied to the drain port and the open end of the drain pipe, and applied to the inner peripheral surface of the inner peripheral layer 2A, or the adhesive applied to the outer peripheral surface of the drain port and the open end of the drain pipe Both end joint ports 2 and 2 can be fixed to the drain port and the drain pipe by the agent.

次に、上記合成樹脂管の製造方法を図２に基づいて説明すると、一定幅と一定厚みを有する半溶融状態の軟質オレフィン系樹脂製帯状材11を第１成形ノズル21から押し出しながら周知のように成形回転軸20の基部上に、先に一巻き状に螺旋巻きした帯状材部の一側端部上に次に一巻状に螺旋巻する帯状材部の対向側端部を重合、融着させながら一定のピッチでもって螺旋状に巻回することにより管主体１の管壁1aを形成していくと共に、第２成形ノズル22から一定径を有する半溶融状態の硬質ポリエチレン樹脂、硬質塩化ビニル樹脂等の硬質合成樹脂製線材4'を一定のピッチでもって螺旋状に巻回する。 Next, the manufacturing method of the synthetic resin pipe will be described with reference to FIG. 2. As is well known, a semi-molten soft olefin resin strip 11 having a constant width and a constant thickness is extruded from the first molding nozzle 21. The opposite end of the belt-like material portion that is next spirally wound on the one side end of the belt-like material portion that has been spirally wound on the base portion of the molding rotating shaft 20 is then superposed and melted. The tube wall 1a of the tube main body 1 is formed by being wound spirally at a constant pitch while being applied, and a semi-molten hard polyethylene resin having a constant diameter from the second molding nozzle 22, hard chloride A wire 4 ′ made of hard synthetic resin such as vinyl resin is spirally wound at a constant pitch.

この際、該硬質合成樹脂製線材4'を先に一巻き状に螺旋巻きした上記帯状材部上に一巻き状に巻回したのち、この一巻き状に巻回した硬質合成樹脂製線材4'上に次に一巻き状に螺旋巻きする上記帯状材部を被せることによって軟質オレフィン系樹脂製帯条材11により形成される管壁1aの外周面にこの硬質合成樹脂製線材4'によって形成する補強螺旋突条４を内装した中空螺旋突条1bを形成していく。 At this time, the hard synthetic resin wire 4 ′ was wound in a single turn on the band-shaped material portion spirally wound in a single turn, and then the hard synthetic resin wire 4 wound in the single turn. Formed with this rigid synthetic resin wire 4 'on the outer peripheral surface of the tube wall 1a formed by the soft olefin resin strip material 11 by covering the strip material portion spirally wound next on the top The hollow spiral ridge 1b in which the reinforcing spiral ridge 4 is built is formed.

さらに、成形回転軸20上に所定長さの管主体１が形成されると、内径が成形回転軸20上を摺動可能な径に形成され、且つ、長さが上記継手口２の内周層2Aを形成している硬質合成樹脂製短筒の２倍の長さを有すると共に外周面に周方向に長い係止突状３を長さ方向に連続山形状に、又は、小間隔毎に断続的に設けている一定厚みの硬質塩化ビニル樹脂製短筒部材2A' を成形回転軸20の基端部側からこの成形回転軸20上を摺動させながら上記管主体１の成形位置に送り込む。 Further, when the pipe main body 1 having a predetermined length is formed on the molding rotary shaft 20, the inner diameter is formed to be a diameter that can slide on the molding rotary shaft 20, and the length is the inner circumference of the joint port 2. It has twice the length of the short tube made of hard synthetic resin forming the layer 2A, and has a circumferentially long locking protrusion 3 on the outer peripheral surface in a continuous mountain shape in the length direction, or at small intervals. A short tube member 2A ′ having a constant thickness, which is intermittently provided, is sent to the molding position of the pipe main body 1 while sliding on the molding rotary shaft 20 from the base end side of the molding rotary shaft 20. .

この硬質塩化ビニル樹脂製短筒部材2A' は、成形回転軸20の基端部において、一定幅と一定厚みを有する半溶融状態の硬質塩化ビニル樹脂製帯状材を成形回転軸20上に先に巻回した帯状材部上に次に巻回する帯状材部を複数層、重ね合わせながら螺旋状に巻着付けて短筒部材2A' と同じ厚みを有する硬質塩化ビニル樹脂製筒部材を形成し、この筒部材を一定長さ毎に順次切断することにより形成してもよく、予め、短筒部材2A' の長さと厚みを有する硬質塩化ビニル樹脂製の半円筒部材を作成しておき、この半円筒部材を上記成形回転軸20に被せて対向端面同士を接合、連結することにより上記短筒部材2A' を形成してもよい。 This short tube member 2A ′ made of hard vinyl chloride resin is formed by placing a semi-molten hard vinyl chloride resin belt-like material having a constant width and thickness at the base end of the molding rotary shaft 20 on the molding rotary shaft 20 first. A plurality of layers of the belt-shaped material portion to be wound next on the wound belt-shaped material portion, spirally wound while overlapping to form a rigid polyvinyl chloride resin tubular member having the same thickness as the short tubular member 2A ′, The cylindrical member may be formed by sequentially cutting at predetermined lengths. A semi-cylindrical member made of a hard vinyl chloride resin having the length and thickness of the short cylindrical member 2A ′ is prepared in advance, and this half member is formed. The short cylindrical member 2A ′ may be formed by covering the cylindrical rotating shaft 20 and joining and connecting the opposing end surfaces.

この硬質塩化ビニル樹脂製短筒部材2A' を、成形回転軸20上で所定長さ製造された上記管主体１端部に向かって送り込むと、上記第１成形ノズル21から押し出される半溶融状態の軟質オレフィン系樹脂製帯条材11がこの管主体１の形成に引き続いて連続的にこの短筒部材2A' 上に螺旋状に巻装する。この際、第１成形ノズル21から押し出される半溶融状態の軟質オレフィン系樹脂製帯条材11の厚みを厚くしながら押し出して短筒部材2A' の外周面に先に一巻状に巻回した帯状材部上に次に巻回する帯状材部を螺旋状に重合、融着させながら所定厚みの軟質オレフィン系樹脂被覆層11' を形成すると共に管主体１の管壁1a上に螺旋巻きした上記第２成形ノズル22からの硬質合成樹脂製線材4'の太さが細くなるように押し出して軟質オレフィン系樹脂被覆層11' 上に螺旋巻きしながらこの軟質オレフィン系樹脂被覆層11' の外周面をローラ（図示せず）によって押圧して硬質合成樹脂製線材4'をこの軟質オレフィン系樹脂被覆層11' 内に埋入させると共に軟質オレフィン系樹脂被覆層11' の外周面を全長に亘って一定径の平滑な面に成形する。 When the short tubular member 2A ′ made of hard vinyl chloride resin is fed toward the end of the tube main body 1 manufactured for a predetermined length on the molding rotating shaft 20, it is in a semi-molten state extruded from the first molding nozzle 21. Following the formation of the tube main body 1, the flexible olefin resin strip 11 is continuously wound spirally on the short cylinder member 2A '. At this time, the semi-molten soft olefin resin strip 11 extruded from the first molding nozzle 21 was extruded while increasing its thickness and wound around the outer peripheral surface of the short cylindrical member 2A 'in a single roll. A soft olefin resin coating layer 11 ′ having a predetermined thickness is formed while spirally polymerizing and fusing the strip material portion to be wound next onto the strip material portion and spirally wound on the tube wall 1 a of the tube main body 1. The outer periphery of the soft olefin resin coating layer 11 'is extruded from the second molding nozzle 22 so that the thickness of the hard synthetic resin wire 4' is reduced and spirally wound on the soft olefin resin coating layer 11 '. The surface is pressed by a roller (not shown) so that the hard synthetic resin wire 4 'is embedded in the soft olefin resin coating layer 11' and the outer peripheral surface of the soft olefin resin coating layer 11 'is extended over the entire length. And molded into a smooth surface with a constant diameter.

こうして、硬質塩化ビニル樹脂製短筒部材2A' の外周面に半溶融状態の肉厚軟質オレフィン系樹脂製帯条材11を螺旋巻きすることによって一定厚みの軟質オレフィン系樹脂被覆層11' を形成しながら成形回転軸20の回転に従ってこの成形回転軸20上を管主体１と一体に硬質塩化ビニル樹脂製短筒部材2A' を成形回転軸20の先端側に向かって移動させ、この移動に従って硬質塩化ビニル樹脂製短筒部材2A' 上に螺旋巻きする肉厚の軟質オレフィン系樹脂製帯条材11がこの硬質塩化ビニル樹脂製短筒部材2A' の後端から成形回転軸20上に螺旋巻きする際に、再び、この軟質オレフィン系樹脂製帯条材11の厚みを元に戻して成形回転軸20上に螺旋巻きすることにより管壁1aを形成すると共に硬質合成樹脂製線材4'の太さも元に戻してこの管壁1a上に螺旋巻きし、且つ、この硬質合成樹脂製線材4'上を螺旋巻きする軟質オレフィン系樹脂製帯条材11によって該硬質合成樹脂製線材4'を被覆した中空螺旋突条1bを形成した一体長さの管主体１を形成し、この管主体１の形成に後続してこの管主体１に次の硬質塩化ビニル樹脂製短筒部材2A' を送り込むことによってこの硬質塩化ビニル樹脂製短筒部材2A' 上に上記同様にして肉厚の軟質オレフィン系樹脂製帯条材11を被覆しながら上記同様にして太さを細くした硬質合成樹脂製線材4'を螺旋巻きして軟質オレフィン系樹脂被覆層11' を形成する。 In this way, a soft olefin resin coating layer 11 'having a constant thickness is formed by spirally winding a thick melted soft olefin resin strip 11 in a semi-molten state on the outer peripheral surface of a short polyvinyl chloride resin member 2A'. While the molding rotary shaft 20 is rotated, the rigid vinyl chloride resin short cylindrical member 2A ′ is moved toward the tip end side of the molding rotary shaft 20 integrally with the pipe main body 1 along the molding rotary shaft 20, and the hard A thick flexible olefin resin strip 11 spirally wound on a polyvinyl chloride short tube member 2A 'is spirally wound on the rotating shaft 20 from the rear end of the rigid polyvinyl chloride resin short tube member 2A'. In this case, the thickness of the soft olefin resin strip 11 is restored and the tube wall 1a is formed by spirally winding the strip on the molding rotary shaft 20, and the thick synthetic resin wire 4 'is thickened. Return to the original and spirally wound on this tube wall 1a, and An integral length pipe main body 1 in which a hollow spiral ridge 1b covering the hard synthetic resin wire 4 'is formed by a soft olefin resin strip 11 spirally wound on the hard synthetic resin wire 4'. After the tube main body 1 is formed, the next rigid vinyl chloride resin short tube member 2A 'is fed into the tube main body 1 to form the same on the hard polyvinyl chloride resin short tube member 2A'. Then, while covering the thick soft olefin resin strip 11, the soft synthetic olefin resin coating layer 11 ′ is formed by spirally winding the thin synthetic resin wire 4 ′ having the same thickness as described above. .

このように、成形回転軸20上で一体長さの管主体１を形成する工程と、この管主体１に向かって硬質塩化ビニル樹脂製短筒部材2A' を送り込んでこの硬質塩化ビニル樹脂製短筒部材2A' 上に軟質オレフィン系樹脂被覆層11' を形成する工程とを繰り返し連続的に行いながら、成形回転軸20の先端側に送り出し、その途上において成形回転軸20の外側方に配設している冷却装置23から噴射される冷却水によって管主体１及び軟質オレフィン系樹脂被覆層11' が冷却されたのち、軟質オレフィン系樹脂被覆層11' により被覆されている硬質塩化ビニル樹脂製短筒部材2A' が成形回転軸20の先端に順次達すると、この成形回転軸20の外周方に配設している回転切断刃24によって硬質塩化ビニル樹脂製短筒部材2A' の長さ方向の中央部を軟質オレフィン系樹脂被覆層11' の外周面から切断して一定長さの管主体１の両端に、分割された硬質塩化ビニル樹脂製短筒部材2A' からなる内周層2Aと分割された軟質オレフィン系樹脂被覆層11' からなる外周層2Bとによって形成された継手口２、２を有する合成樹脂管を製造するものである。 Thus, the step of forming the tube main body 1 having an integral length on the molding rotating shaft 20 and the short tube member 2A ′ made of hard vinyl chloride resin are fed toward the pipe main body 1 to make the short body made of hard vinyl chloride resin. The process of forming the soft olefin resin coating layer 11 ′ on the cylindrical member 2A ′ is repeated and continuously sent to the tip end side of the molding rotary shaft 20, and arranged on the outer side of the molding rotary shaft 20 in the middle The pipe main body 1 and the soft olefin-based resin coating layer 11 ′ are cooled by the cooling water sprayed from the cooling device 23, and then the hard polyvinyl chloride resin short coat coated with the soft olefin-based resin coating layer 11 ′ is used. When the cylindrical member 2A ′ sequentially reaches the tip of the molding rotary shaft 20, the rotary cutting blade 24 disposed on the outer periphery of the molding rotary shaft 20 causes the rigid vinyl chloride resin short cylindrical member 2A ′ in the longitudinal direction. Soft olefin resin coating layer 1 in the center Cut from the outer peripheral surface of 1 ', the inner peripheral layer 2A composed of a short tubular member 2A' made of hard vinyl chloride resin and the divided soft olefin resin coating layer 11 are formed at both ends of the tube main body 1 having a predetermined length. A synthetic resin pipe having joint ports 2 and 2 formed by an outer peripheral layer 2B made of 'is manufactured.

上記実施例においては、管主体１の両端に設けている継手口２、２として、硬質塩化ビニル樹脂製短筒からなる内周層2Aの内径が管主体１の内径と同一径のものを示したが、該内周層2Aの内径を管主体１の内径よりも大径に形成しておいてもよい。 In the above-described embodiment, the joint ports 2 and 2 provided at both ends of the pipe main body 1 have the inner diameter of the inner peripheral layer 2A made of a hard vinyl chloride resin short cylinder having the same diameter as the inner diameter of the pipe main body 1. However, the inner diameter of the inner peripheral layer 2A may be formed larger than the inner diameter of the tube main body 1.

図３はその実施例を示すもので、一定長さを有する可撓性を有する管主体１の両端部に剛直性を有する一定長さの継手口２、２を設けてなる合成樹脂管であって、ポリエチレン又はポリプロピレン等の軟質オレフィン系樹脂よりなる管主体１の両端部に、硬質合成樹脂製短筒からなる内周層2Aの外周面に軟質オレフィン系樹脂被覆層からなる外周層2Bを層着してなる継手口２、２を設けた合成樹脂管において、管主体１は上記実施例と同一構造、即ち、軟質オレフィン系樹脂製帯条材を螺旋巻きすることによって形成された管壁1aの外周面に硬質塩化ビニル樹脂又は硬質ポリエチレン樹脂等の硬質合成樹脂製線材からなる補強螺旋突条４を一定のピッチでもって螺旋巻きしていると共にこの補強螺旋突条４を軟質オレフィン系樹脂からなる中空螺旋突条1bによって被覆した構造を有する。 FIG. 3 shows an embodiment thereof, which is a synthetic resin pipe in which fixed-length joint ports 2 and 2 having rigidity are provided at both ends of a flexible pipe main body 1 having a fixed length. The outer peripheral layer 2B made of a soft olefin resin coating layer is formed on the outer peripheral surface of the inner peripheral layer 2A made of a hard synthetic resin short tube at both ends of the tube main body 1 made of a soft olefin resin such as polyethylene or polypropylene. In the synthetic resin pipe having the joint ports 2 and 2 formed by wearing, the pipe main body 1 has the same structure as the above embodiment, that is, a pipe wall 1a formed by spirally winding a strip made of a soft olefin resin. A reinforcing spiral ridge 4 made of a hard synthetic resin wire such as a hard vinyl chloride resin or a hard polyethylene resin is spirally wound at a constant pitch on the outer peripheral surface of the resin, and the reinforced spiral ridge 4 is made of a soft olefin resin. Become hollow Having a coating structure by 旋突 strip 1b.

継手口２、２の構造も内周層2Aの内径が管主体１の内径よりも大径に形成している以外は上記実施例と同様である。即ち、継手口２、２は、その内径を管主体１の内径よりも大径の硬質塩化ビニル樹脂製短筒からなり、この内周層2Aを形成している硬質塩化ビニル樹脂製短筒の外周面には、周方向に長い複数条の係止突条３を管主体１の長さ方向に連続又は所望間隔毎に形成し、この係止突条３を上記外周層2Bの内面に食い込ませて外周層2Bが接着困難なオレフィン系樹脂からなるにもかかわらず、硬質塩化ビニル樹脂製短筒からなる内周層2Aをこの外周層2Bの内周面に一体に結合、固着している。また、上記軟質オレフィン系樹脂からなる管壁1aの両端をこれらの継手口２、２における上記軟質オレフィン系樹脂からなる外周層2Bの基端に連続させている。なお、上記補強螺旋突条４は管壁1aの両端から極細に形成されて継手口２の外周層2B内に埋設させてあり、継手口２の外周層2Bの外周面は全長に亘って同一径の平滑な面に形成されている。 The structure of the joint ports 2 and 2 is the same as that of the above embodiment except that the inner diameter of the inner peripheral layer 2A is larger than the inner diameter of the pipe main body 1. That is, the joint ports 2 and 2 are made of a hard vinyl chloride resin short tube whose inner diameter is larger than the inner diameter of the tube main body 1, and the hard polyvinyl chloride resin short tube forming the inner peripheral layer 2A. On the outer peripheral surface, a plurality of locking ridges 3 that are long in the circumferential direction are formed in the length direction of the pipe main body 1 continuously or at desired intervals, and these locking ridges 3 are bitten into the inner surface of the outer peripheral layer 2B. Even though the outer peripheral layer 2B is made of an olefin-based resin that is difficult to adhere, the inner peripheral layer 2A made of a short tube made of hard vinyl chloride resin is integrally bonded and fixed to the inner peripheral surface of the outer peripheral layer 2B. . Further, both ends of the tube wall 1a made of the soft olefin resin are connected to the base end of the outer peripheral layer 2B made of the soft olefin resin in the joint ports 2 and 2. The reinforcing spiral ridge 4 is formed very thin from both ends of the tube wall 1a and is embedded in the outer peripheral layer 2B of the joint port 2. The outer peripheral surface of the outer peripheral layer 2B of the joint port 2 is the same over the entire length. It is formed on a smooth surface.

このように構成した合成樹脂管の製造方法は、上記図２で示した製造方法において、継手口２の内径を大径に形成する手段を有する以外は同じである。この製造方法を図４に基づいて説明すると、一定幅と一定厚みを有する半溶融状態の軟質オレフィン系樹脂製帯状材11を第１成形ノズル21から押し出しながら、成形回転軸20の基部上に、先に一巻き状に螺旋巻きした帯状材部の一側端部上に次に一巻状に螺旋巻する帯状材部の対向側端部を重合、融着させながら一定のピッチでもって螺旋状に巻回することにより管主体１の管壁1aを形成していくと共に、第２成形ノズル22から一定径を有する半溶融状態の硬質ポリエチレン樹脂、硬質塩化ビニル樹脂等の硬質合成樹脂製線材4'を一定のピッチでもって螺旋状に巻回する。 The manufacturing method of the synthetic resin pipe configured as described above is the same as the manufacturing method shown in FIG. 2 except that it has means for forming the inner diameter of the joint port 2 to be large. This manufacturing method will be described with reference to FIG. 4. While extruding a semi-molten soft olefin resin strip 11 having a constant width and a constant thickness from the first molding nozzle 21, on the base of the molding rotary shaft 20, Spiral at a constant pitch while superposing and fusing the opposite end of the band-shaped material part spirally wound next onto the one side end of the belt-shaped material part spirally wound first. The tube wall 1a of the tube main body 1 is formed by being wound around the wire, and the wire 4 made of a hard synthetic resin such as a semi-molten hard polyethylene resin or a hard vinyl chloride resin having a constant diameter from the second molding nozzle 22 Wind 'in a spiral with a constant pitch.

成形回転軸20上に所定長さの管主体１が形成されると、管主体１の形成部分に対して成形回転軸20の基端部側（後方側）で、この成形回転軸20上に硬質ゴム又は硬質合成樹脂よりなる拡径継手部成形部材25を摺動自在に配設すると共にこの拡径継手部成形部材25の外周面に長さが上記継手口２の内周層2Aを形成している硬質塩化ビニル樹脂製短筒の２倍の長さを有すると共に外周面に周方向に長い係止突状３を長さ方向に連続山形状に、又は、小間隔毎に断続的に設けている一定厚みの硬質塩化ビニル樹脂製短筒部材2A''を被せる。 When the pipe main body 1 having a predetermined length is formed on the forming rotary shaft 20, the base end side (rear side) of the forming rotary shaft 20 is formed on the forming rotary shaft 20 with respect to the forming portion of the pipe main body 1. An enlarged joint portion molding member 25 made of hard rubber or hard synthetic resin is slidably disposed, and an inner peripheral layer 2A of the joint port 2 is formed on the outer peripheral surface of the enlarged joint portion molding member 25. The locking projections 3 having a length twice as long as the short tube made of rigid polyvinyl chloride resin and being long in the circumferential direction are formed in a continuous mountain shape in the length direction or intermittently at small intervals. The provided short tube member 2A ″ made of hard vinyl chloride resin having a certain thickness is covered.

拡径継手部成形部材25は、この硬質塩化ビニル樹脂製短筒部材2A''と同一長さを有する短筒形状に形成されてあり、半円筒形状の分割片をその一方の対向端縁部をヒンジ部に形成してこのヒンジ部を支点として他方の対向端縁部間を開閉可能とし、成形回転軸20上に着脱自在に被嵌させるように構成している。なお、ヒンジによることなく半円筒形状の分割片を組み合わせて円筒状の拡径継手部成形部材25を形成してもよい。一方、硬質塩化ビニル樹脂製短筒部材2A''は、拡径継手部成形部材25上に半円筒形状のものを組み合わせて円筒状の硬質塩化ビニル樹脂製短筒部材2A''を形成する。 The expansion joint portion molding member 25 is formed in a short cylindrical shape having the same length as the rigid polyvinyl chloride resin short cylindrical member 2A '', and a semi-cylindrical divided piece is formed at one of the opposing edge portions. Is formed in a hinge portion, and the hinge portion is used as a fulcrum to allow opening and closing between the other opposing end edge portions, and is configured to be detachably fitted onto the molding rotary shaft 20. It should be noted that the cylindrical enlarged diameter joint portion molding member 25 may be formed by combining semi-cylindrical divided pieces without using a hinge. On the other hand, the short cylindrical member 2A ″ made of hard vinyl chloride resin is combined with a semi-cylindrical member on the expanded joint portion forming member 25 to form a cylindrical hard polyvinyl chloride short tube member 2A ″.

この硬質塩化ビニル樹脂製短筒部材2A''を被せている拡径継手部成形部材25を成形回転軸20の基端部側から成形回転軸20上で所定長さ製造された上記管主体１端部に向かって送り込むと、上記第１成形ノズル21から押し出される半溶融状態の軟質オレフィン系樹脂製帯条材11がこの管主体１の形成に引き続いて連続的に上記硬質塩化ビニル樹脂製短筒部材2A''上に螺旋状に巻装する。この際、第１成形ノズル21から押し出される半溶融状態の軟質オレフィン系樹脂製帯条材11の厚みを厚くしながら押し出して所定厚みの軟質オレフィン系樹脂被覆層11' を形成すると共に管主体１の管壁1a上に螺旋巻きした上記第２成形ノズル22からの硬質合成樹脂製線材4'の太さが細くなるように押し出して軟質オレフィン系樹脂被覆層11' 上に螺旋巻きしながらこの軟質オレフィン系樹脂被覆層11' の外周面をローラ（図示せず）によって押圧して硬質合成樹脂製線材4'をこの軟質オレフィン系樹脂被覆層11' 内に埋入させると共に軟質オレフィン系樹脂被覆層11' の外周面を全長に亘って一定径の平滑な面に成形する。 The pipe main body 1 is manufactured from the base end portion of the molding rotary shaft 20 on the molding rotary shaft 20 to a predetermined length on the diameter-expanded joint molding member 25 covering the short polyvinyl chloride resin short cylindrical member 2A ″. When fed toward the end, the semi-molten soft olefin resin strip 11 extruded from the first molding nozzle 21 is continuously formed by the rigid polyvinyl chloride resin short-cut following the formation of the tube main body 1. It is wound spirally on the cylindrical member 2A ''. At this time, the semi-molten soft olefin resin strip 11 extruded from the first molding nozzle 21 is extruded while increasing its thickness to form a soft olefin resin coating layer 11 ′ having a predetermined thickness and the pipe main body 1. The hard synthetic resin wire 4 ′ spirally wound on the tube wall 1a of the tube is extruded so that the thickness of the hard synthetic resin wire 4 ′ is thinned and spirally wound on the soft olefin resin coating layer 11 ′. The outer peripheral surface of the olefin-based resin coating layer 11 ′ is pressed by a roller (not shown) to embed the hard synthetic resin wire 4 ′ in the soft olefin-based resin coating layer 11 ′ and the soft olefin-based resin coating layer. The outer peripheral surface of 11 'is formed into a smooth surface having a constant diameter over the entire length.

こうして、硬質塩化ビニル樹脂製短筒部材2A''の外周面に半溶融状態の肉厚軟質オレフィン系樹脂製帯条材11を螺旋巻きすることによって一定厚みの軟質オレフィン系樹脂被覆層11' を形成しながら成形回転軸20の回転に従ってこの成形回転軸20上を管主体１と一体に硬質塩化ビニル樹脂製短筒部材2A''を被せている拡径継手部成形部材25を成形回転軸20の先端側に向かって移動させ、この移動に従って硬質塩化ビニル樹脂製短筒部材2A''上に螺旋巻きする肉厚の軟質オレフィン系樹脂製帯条材11がこの硬質塩化ビニル樹脂製短筒部材2A''の後端から成形回転軸20上に螺旋巻きする際に、再び、この軟質オレフィン系樹脂製帯条材11の厚みを元に戻して成形回転軸20上に螺旋巻きすることにより管壁1aを形成すると共に硬質合成樹脂製線材4'の太さも元に戻してこの管壁1a上に螺旋巻きし、且つ、この硬質合成樹脂製線材4'上を螺旋巻きする軟質オレフィン系樹脂製帯条材11によって該硬質合成樹脂製線材4'を被覆した中空螺旋突条1bを形成した一体長さの管主体１を形成し、この管主体１の形成に後続してこの管主体１の後端に次の硬質塩化ビニル樹脂製短筒部材2A''をう被せている拡径継手部成形部材25をを送り込むことによって硬質塩化ビニル樹脂製短筒部材2A''上に上記同様にして肉厚の軟質オレフィン系樹脂製帯条材11を被覆しながら上記同様にして太さを細くした硬質合成樹脂製線材4'を螺旋巻きして軟質オレフィン系樹脂被覆層11' を形成する。 In this way, a semi-molten thick soft olefin resin strip 11 is spirally wound around the outer peripheral surface of the rigid vinyl chloride resin short cylindrical member 2A '' to thereby form a soft olefin resin coating layer 11 'having a constant thickness. As the molding rotary shaft 20 is rotated, the molding rotary shaft 20 is formed with a large-diameter joint portion molding member 25 covering the molding rotary shaft 20 and the tube main body 1 with a short tube member 2A ″ made of rigid polyvinyl chloride resin. The thick flexible olefin resin strip material 11 spirally wound on the hard vinyl chloride resin short tube member 2A '' according to this movement is moved to the tip side of the hard vinyl chloride resin short tube member When spirally wound on the molding rotating shaft 20 from the rear end of 2A '', the thickness of the soft olefin resin strip material 11 is restored to the original state and spirally wound on the molding rotating shaft 20 to make a tube. The wall 1a is formed and the thickness of the hard synthetic resin wire 4 'is also restored. A hollow spiral projection in which the hard synthetic resin wire 4 ′ is covered with a soft olefin resin strip 11 wound spirally on the tube wall 1a and spirally wound on the hard synthetic resin wire 4 ′. A tube main body 1 having an integral length formed with a strip 1b is formed, and subsequently the tube main body 1 is formed, and the rear end of the pipe main body 1 is covered with the following short tube member 2A ″ made of hard vinyl chloride resin. In the same manner as described above while coating the thick flexible olefin resin strip material 11 on the rigid polyvinyl chloride resin short tube member 2A '' A soft synthetic olefin resin coating layer 11 'is formed by spirally winding a hard synthetic resin wire 4' having a reduced thickness.

このように、成形回転軸20上で一体長さの管主体１を形成する工程と、この管主体１に向かって硬質塩化ビニル樹脂製短筒部材2A''を被せている拡径継手部成形部材25を送り込んでこの硬質塩化ビニル樹脂製短筒部材2A''上に軟質オレフィン系樹脂被覆層11' を形成する工程とを繰り返し連続的に行いながら、成形回転軸20の先端側に送り出し、その途上において成形回転軸20の外側方に配設している冷却装置23から噴射される冷却水によって管主体１及び軟質オレフィン系樹脂被覆層11' が冷却されたのち、軟質オレフィン系樹脂被覆層11' により被覆されている硬質塩化ビニル樹脂製短筒部材2A''が該硬質塩化ビニル樹脂製短筒部材2A''を被せている拡径継手部成形部材25と一体で成形回転軸20の先端に順次達すると、この成形回転軸20の外周方に配設している回転切断刃24によって硬質塩化ビニル樹脂製短筒部材2A''の長さ方向の中央部を軟質オレフィン系樹脂被覆層11' の外周面から拡径継手部成形部材25の外周面に達するまで切断したのち拡径継手部成形部材25を抜き取ることによって、一定長さの管主体１の両端に、この拡径継手部成形部材25の抜き取りによって内径が管主体１の内径よりも大径に形成されている分割された硬質塩化ビニル樹脂製短筒部材2A''を内周層2Aとし、分割された軟質オレフィン系樹脂被覆層11' を外周層2Bとした継手口２、２を有する合成樹脂管を製造するものである。なお、上記拡径継手部成形部材25は、予め、長さ方向に二分割されたものを、分割可能に組み合わせておいてもよい。 Thus, the process of forming the tube main body 1 having an integral length on the molding rotating shaft 20 and the formation of the expanded joint portion covering the tube main body 1 with the short cylindrical member 2A ″ made of hard vinyl chloride resin. While repeatedly performing the process of feeding the member 25 and repeatedly forming the soft olefin resin coating layer 11 ′ on the rigid polyvinyl chloride resin short cylindrical member 2A '', it is sent to the tip side of the molding rotary shaft 20, On the way, the pipe main body 1 and the soft olefin resin coating layer 11 ′ are cooled by the cooling water sprayed from the cooling device 23 disposed outside the molding rotating shaft 20, and then the soft olefin resin coating layer. The short cylindrical member 2A '' made of hard vinyl chloride resin covered with 11 'is integrally formed with the molded joint 25 of the expanded joint portion covering the short tubular member 2A' 'made of hard vinyl chloride resin. When it reaches the tip sequentially, it is arranged on the outer periphery of this molding rotary shaft 20. The rotating cutting blade 24 reaches the outer peripheral surface of the expanded joint portion molding member 25 from the outer peripheral surface of the soft olefin resin coating layer 11 'to the central portion in the length direction of the short cylindrical member 2A' 'made of rigid polyvinyl chloride resin. Are cut out until the inner diameter of the pipe main body 1 is made larger than the inner diameter of the pipe main body 1. A composite pipe having joint ports 2 and 2 in which the formed short tubular member 2A ″ made of hard vinyl chloride resin is used as the inner peripheral layer 2A and the divided soft olefin resin coating layer 11 ′ is used as the outer peripheral layer 2B. A resin tube is manufactured. Note that the diameter-expanded joint forming member 25 may be previously divided in two in the length direction and combined in a severable manner.

以上の実施例においては、管主体１の両端に同一構造の継手口２、２を有する合成樹脂管について説明したが、図５に示すように、管主体１の一端側に、硬質塩化ビニル樹脂製短筒からなる内周層2Aと軟質オレフィン系樹脂被覆層からなる外周層2Bとからなる継手口２を、他端側に硬質塩化ビニル樹脂製短筒を設けることなる軟質オレフィン系樹脂被覆層を厚くし、且つ、内径が管主体１と内径と同一径に形成した軟質継手口2'を設けている合成樹脂管であってもよく、また、図６に示すように、管主体１の一端側に、内径が管主体１の内径よりも大径に形成した硬質塩化ビニル樹脂製短筒よりなる内周層2Aを備えた継手口２を、他端部に内径が管主体１の内径と同一径に形成した硬質塩化ビニル樹脂製短筒よりなる内周層2Aを備えた継手口２を形成した合成樹脂管であってもよく、要するに、少なくとも一方の継手口の内周層を内周面が平滑な面に形成されている硬質塩化ビニル樹脂製短筒によって形成しておけば本発明を満足させることができる。また、内周層を形成する硬質塩化ビニル樹脂製短筒の外周面に軟質オレフィン系樹脂被覆層との一体化を図るために係止突条を設けているが、この係止突条に代えて係止凹部を設けておいてもよい。 In the above embodiment, the synthetic resin pipe having the joint ports 2 and 2 having the same structure at both ends of the pipe main body 1 has been described. However, as shown in FIG. A soft olefin resin coating layer in which a joint port 2 consisting of an inner peripheral layer 2A made of a short tube and an outer peripheral layer 2B made of a soft olefin resin coating layer is provided with a hard vinyl chloride resin short tube on the other end side. 6 and may be a synthetic resin pipe provided with a soft joint port 2 ′ having an inner diameter that is the same as the inner diameter of the pipe main body 1, and as shown in FIG. A joint port 2 having an inner peripheral layer 2A made of a hard vinyl chloride resin short tube formed with an inner diameter larger than the inner diameter of the tube main body 1 at one end side, and an inner diameter of the pipe main body 1 at the other end portion. A joint port 2 having an inner peripheral layer 2A made of a short tube made of hard polyvinyl chloride resin and having the same diameter as The synthetic resin pipe may be formed. In short, if the inner peripheral layer of at least one joint port is formed by a rigid polyvinyl chloride resin short tube having a smooth inner peripheral surface, the present invention. Can be satisfied. In addition, a locking ridge is provided on the outer peripheral surface of the rigid polyvinyl chloride resin short tube forming the inner peripheral layer in order to integrate with the soft olefin resin coating layer. A locking recess may be provided.

さらに、上記いずれの実施例においても、継手口２、２における外周面を軟質オレフィン系樹脂からなる外周層2Bによって形成しているが、図７に示すように、この外周層2Bの外周面を、全長に亘って同一径の平滑な面に形成している一定の肉厚を有する硬質塩化ビニル樹脂からなる円筒状被覆層５によって被覆しておいてもよい。即ち、この合成樹脂管は、その管主体１を上記実施例と同様に軟質オレフィン系樹脂よりなり、この管主体１の両端部に、内周層2Aが内周面を全長に亘って平滑な面に形成している硬質塩化ビニル樹脂製短筒からなり、外周層2Bが軟質オレフィン系樹脂からなる継手口２、２を設けていると共にこの外周層2B上に硬質塩化ビニル樹脂製被覆層５を形成してなるものである。また、この図７に示す合成樹脂管においては、管主体１の外周面に螺旋状に巻着している硬質塩化ビニル樹脂製の補強螺旋突条４は断面矩形状に形成されていて、上記実施例のように中空螺旋突条1bによって被覆されることなる管主体１の外周面に露出させた状態で巻着してあり、上記継手口２における軟質オレフィン系樹脂からなる外周層2Bの外周面においては、この補強螺旋突条４を幅広くして隣接する補強螺旋突条同士を接合させながら螺旋巻きすることによって上記円筒状被覆層５を形成している。 Further, in any of the above embodiments, the outer peripheral surface of the joint ports 2 and 2 is formed by the outer peripheral layer 2B made of a soft olefin resin. As shown in FIG. 7, the outer peripheral surface of the outer peripheral layer 2B is Further, it may be covered with a cylindrical covering layer 5 made of a hard vinyl chloride resin having a constant thickness and formed on a smooth surface having the same diameter over the entire length. That is, in this synthetic resin pipe, the pipe main body 1 is made of a soft olefin resin in the same manner as in the above embodiment, and the inner peripheral layer 2A is smooth over the entire length at both ends of the pipe main body 1. It is composed of a short tube made of hard vinyl chloride resin formed on the surface, the outer peripheral layer 2B is provided with joint ports 2 and 2 made of a soft olefin resin, and a hard vinyl chloride resin coating layer 5 is provided on the outer peripheral layer 2B. Is formed. Further, in the synthetic resin pipe shown in FIG. 7, the reinforcing spiral protrusion 4 made of hard vinyl chloride resin that is spirally wound around the outer peripheral surface of the pipe main body 1 is formed in a rectangular cross section. As shown in the embodiment, the outer periphery of the outer peripheral layer 2B made of a soft olefin resin is wound around the pipe main body 1 so as to be exposed on the outer peripheral surface of the pipe main body 1 to be covered with the hollow spiral ridge 1b. On the surface, the cylindrical covering layer 5 is formed by widening the reinforcing spiral ridge 4 and spirally winding the adjacent reinforcing spiral ridges together.

１管主体
1a 管壁
２継手口
2A 内周層
2B 外周層
３係止突条
４補強螺旋突条
2A' 硬質塩化ビニル樹脂製短筒
20 成形回転軸
21 第１成形ノズル
22 第２成形ノズル
23 冷却装置
24 回転切断刃
25 拡径継手部成形部材 1 Pipe main
1a Pipe wall 2 Joint port
2A Inner layer
2B Outer peripheral layer 3 Locking ridge 4 Reinforcing spiral ridge
2A 'Hard vinyl chloride resin short tube
20 Molding axis
21 First molding nozzle
22 Second molding nozzle
23 Cooling device
24 rotary cutting blade
25 Molded parts for expanded joints

Claims

軟質オレフィン系樹脂よりなる可撓性を有する管主体の両端部に継手口を設けている合成樹脂管であって、少なくとも一方の継手口の内周層を内周面が平滑な面に形成されている硬質塩化ビニル樹脂製短筒によって形成し、この継手口の外周層を上記管主体を形成している軟質オレフィン系樹脂によって形成していることを特徴とする合成樹脂管。 A synthetic resin pipe provided with joint ports at both ends of a flexible pipe body made of a soft olefin-based resin, and the inner peripheral layer of at least one joint port is formed with a smooth inner peripheral surface. A synthetic resin pipe characterized in that it is formed by a short tube made of hard vinyl chloride resin, and the outer peripheral layer of the joint port is formed by a soft olefin resin forming the pipe main body.

硬質塩化ビニル樹脂製短筒からなる継手口内周層の内径を管主体の内径と同径に形成していることを特徴とする請求項１に記載の合成樹脂管。 2. The synthetic resin pipe according to claim 1, wherein the inner diameter of the inner peripheral layer of the joint port made of a short tube made of hard vinyl chloride resin is formed to be the same as the inner diameter of the pipe main body.

硬質塩化ビニル樹脂製短筒からなる継手口内周層の内径を管主体の内径よりも大径に形成していることを特徴とする請求項１に記載の合成樹脂管。 2. The synthetic resin pipe according to claim 1, wherein an inner diameter of the inner peripheral layer of the joint port made of a rigid polyvinyl chloride resin short cylinder is formed to be larger than an inner diameter of the pipe main body.

可撓性を有する管主体の両端継手口の内周層を硬質塩化ビニル樹脂製短筒によって形成していることを特徴とする請求項１、請求項２又は請求項３に記載の合成樹脂管。 The synthetic resin pipe according to claim 1, 2 or 3, wherein the inner peripheral layer of the joint end of the pipe main body having flexibility is formed of a short tube made of hard vinyl chloride resin. .

軟質オレフィン系樹脂からなる管主体の両端部を内周層の外周面に被覆することによって外周面が平滑な継手口の外周層を形成していると共に、両端継手口間の管主体の外周面に硬質合成樹脂製線材からなる補強螺旋突条を設けていることを特徴とする請求項１ないし請求項４のうち、いずれか１項に記載の合成樹脂管。 The outer periphery of the pipe main body between both ends of the joint port is formed by covering both ends of the tube main body made of a soft olefin resin on the outer peripheral surface of the inner peripheral layer to form the outer peripheral layer of the joint port with a smooth outer peripheral surface. The synthetic resin pipe according to any one of claims 1 to 4, further comprising a reinforcing spiral protrusion made of a hard synthetic resin wire.

内周層を形成している硬質塩化ビニル樹脂製短筒の外周面に複数の係止突条を突設してあり、この係止突条を軟質オレフィン系樹脂からなる外周層の内周面に食い込ませてこれらの内周層と外周層とを一体に結合させていることを特徴とする請求項５に記載の合成樹脂管。 A plurality of locking ridges are provided on the outer peripheral surface of a short tube made of hard polyvinyl chloride resin forming the inner peripheral layer, and the inner peripheral surface of the outer peripheral layer made of a soft olefin-based resin. The synthetic resin pipe according to claim 5, wherein the inner peripheral layer and the outer peripheral layer are integrally joined by biting into the inner periphery.

内周層を形成している硬質塩化ビニル樹脂製短筒の外周面に複数の係止凹部を設けてあり、この係止凹部内に軟質オレフィン系樹脂からなる外周層の内周部を係止させてこれらの内周層と外周層とを一体に結合させていることを特徴とする請求項５に記載の合成樹脂管。 A plurality of locking recesses are provided on the outer peripheral surface of the rigid polyvinyl chloride resin short cylinder forming the inner peripheral layer, and the inner peripheral portion of the outer peripheral layer made of a soft olefin resin is locked in the locking recess. 6. The synthetic resin pipe according to claim 5, wherein the inner peripheral layer and the outer peripheral layer are integrally bonded.

外周層を外周面が全長に亘って同一径の平滑面に形成している硬質塩化ビニル樹脂からなる円筒状被覆層によって被覆していることを特徴とする請求項１、請求項５に記載の合成樹脂管。 The outer peripheral layer is covered with a cylindrical covering layer made of a hard vinyl chloride resin, the outer peripheral surface of which is formed on a smooth surface having the same diameter over the entire length. Synthetic resin tube.

成形回転軸上に半溶融状態の軟質オレフィン系樹脂製帯状材を対向する側端部を重合、融着させながら螺旋巻きすると共にこの軟質オレフィン系樹脂製帯状材上に硬質合成樹脂製線材を一定のピッチでもって螺旋状に巻着することにより管主体を形成し、所定長さの管主体が形成される毎にこの管主体の成形個所に向かって成形回転軸上を通じて外周面に複数の係止突条又は係止凹部を設けている硬質塩化ビニル樹脂製短筒部材を順次送り込んでこの硬質塩化ビニル樹脂製短筒部材上に上記半溶融状態の軟質オレフィン系樹脂製帯状材を螺旋巻きすることにより一定厚みの軟質オレフィン系樹脂被覆層を形成すると共にこの軟質オレフィン系樹脂被覆層内に上記硬質合成樹脂製線材を埋設させることによって該軟質オレフィン系樹脂被覆層の外周面を平滑な面に形成し、しかるのち、この軟質オレフィン系樹脂被覆層で被覆された硬質塩化ビニル樹脂製短筒部材の長さ方向の中央部を切断することにより、一定長さの管主体の両端部に内周層が上記硬質塩化ビニル樹脂製短筒部材の分割片からなる硬質塩化ビニル樹脂製短筒によって形成され、外周層が上記分割された軟質オレフィン系樹脂被覆層によって形成された継手口を設けている合成樹脂管を順次製造することを特徴とする合成樹脂管の製造方法。 A semi-molten soft olefin resin strip is spirally wound while polymerizing and fusing the opposite end portions of the soft olefin resin strip on the mold rotation shaft, and a rigid synthetic resin wire is fixed on the soft olefin resin strip. A pipe main body is formed by spirally winding at a pitch of a predetermined length, and each time a pipe main body of a predetermined length is formed, a plurality of engagements are formed on the outer peripheral surface through the molding rotation shaft toward the molding main body. A rigid polyvinyl chloride resin short cylindrical member provided with a stop ridge or a locking recess is sequentially fed, and the semi-molten soft olefin resin strip is spirally wound on the hard polyvinyl chloride resin short cylindrical member. By forming a soft olefin resin coating layer having a certain thickness by embedding the hard synthetic resin wire in the soft olefin resin coating layer, By forming the peripheral surface into a smooth surface and then cutting the central portion in the length direction of the short tube member made of hard vinyl chloride resin coated with the soft olefin resin coating layer, a tube of a certain length is obtained. An inner peripheral layer is formed by a hard vinyl chloride resin short cylinder made of a divided piece of the hard vinyl chloride resin short cylinder member at both ends of the main body, and an outer peripheral layer is formed by the divided soft olefin resin coating layer. A synthetic resin pipe manufacturing method comprising sequentially manufacturing a synthetic resin pipe provided with a joint port.

硬質塩化ビニル樹脂製短筒部材を円筒形状の継手部成形部材上に抜き取り可能に被せた状態で管主体の形成個所に送り込み、この硬質塩化ビニル樹脂製短筒部材に半溶融状態の軟質オレフィン系樹脂製帯状材を螺旋巻きすることにより一定厚みの軟質オレフィン系樹脂被覆層を形成し、この軟質オレフィン系樹脂被覆層で被覆された硬質塩化ビニル樹脂製短筒部材の長さ方向の中央部を切断したのちその切断口から上記継手部成形部材を引き抜くことにより、一定長さの管主体の両端部に内周層が上記硬質塩化ビニル樹脂製短筒部材の分割片からなり且つ内径が管主体の内径よりも大径に形成された硬質塩化ビニル樹脂製短筒によって形成され、外周層が上記分割された軟質オレフィン系樹脂被覆層によって形成された継手口を設けることを特徴とする請求項８に記載の合成樹脂管の製造方法。 A short tube member made of hard vinyl chloride resin is placed on a cylindrical joint molded member so that it can be pulled out and sent to the main tube forming part. A soft olefin resin coating layer having a constant thickness is formed by spirally winding a resin band, and the central portion in the length direction of the rigid vinyl chloride resin short tube member covered with the soft olefin resin coating layer is formed. After cutting, by pulling out the joint forming member from the cut opening, the inner peripheral layer is composed of divided pieces of the short tube member made of rigid polyvinyl chloride resin at both ends of the pipe main body of a certain length, and the inner diameter is the pipe main body. Forming a joint opening formed by a rigid polyvinyl chloride resin short cylinder formed with a diameter larger than the inner diameter of the outer peripheral layer and the outer peripheral layer formed by the divided soft olefin resin coating layer. Method for manufacturing a synthetic resin tube according to claim 8, symptoms.