JP5393019B2

JP5393019B2 - Synthetic resin connecting pipe and its manufacturing method

Info

Publication number: JP5393019B2
Application number: JP2007276467A
Authority: JP
Inventors: 昭夫永吉; 清治永吉
Original assignee: エバック株式会社
Priority date: 2007-10-24
Filing date: 2007-10-24
Publication date: 2014-01-22
Anticipated expiration: 2027-10-24
Also published as: JP2009103243A

Description

本発明は一端部に円筒形状の軟質継手部を、他端部に円筒形状の硬質継手部を一体に設けてなる可撓性を有する合成樹脂製接続用管とその製造方法に関するものである。 The present invention relates to a flexible synthetic resin connecting pipe having a cylindrical soft joint portion at one end and a cylindrical hard joint portion at the other end, and a method for manufacturing the same.

従来から、例えば、流し台のトラップ排水口や洗面器の排水口等を排水管に接続させたり、空調機の排水口を排水管に接続させるための一定長さを有する継手用或いは接続用合成樹脂製管としては、接続すべき排水口と排水管との対向する開口端部や、排水管同士の対向する開口端部が同一管軸上に対して互いにずれている場合や交差状に配設されている場合であっても確実に接続できるようにするために、適度な可撓性と両端部に継手部を備えた構造のものが要求される。 Conventionally, for example, a synthetic resin for a joint or connection having a certain length for connecting a trap drain port of a sink or a drain port of a basin to a drain pipe or connecting a drain port of an air conditioner to a drain pipe As pipe making, when the opening end facing the drain outlet and the drain pipe to be connected, or when the opening end facing the drain pipes are shifted from each other on the same tube axis, or arranged in a crossing manner Even in such a case, a structure having moderate flexibility and joint portions at both ends is required in order to ensure connection.

このような要求を満たすことができる合成樹脂製接続用管としては、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合成樹脂製管体の両端部に外周面が平坦な円筒形状の硬質合成樹脂製継手部を一体に設けていると共にこれらの継手部間の外周面に断面横長矩形状の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ホースや、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突条を設けていると共にこのホース主体の両端部に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。 As described in Patent Document 1, as a synthetic resin connecting pipe that can satisfy such requirements, a cylinder with a flat outer peripheral surface at both ends of a soft synthetic resin tubular body having a certain length. A hose in which a hard synthetic resin joint portion having a shape is integrally provided and a rigid synthetic resin reinforcing material having a rectangular cross section is wound around the outer peripheral surface between these joint portions in a spiral shape at a constant pitch and, as described in Patent Document 2 is provided with a reinforcing spiral ridge by wound around a hard synthetic resin wire rod spirally on the outer peripheral surface of the soft synthetic resin hose main having a predetermined length In addition, a soft synthetic resin hose has been developed in which a short cylindrical soft synthetic resin joint is integrally provided at both ends of the hose main body.

さらに、上記のような合成樹脂製接続用管の製造方法として、例えば、特許文献１においては、一定幅と厚みを有する半溶融状態の軟質合成樹脂製帯状材を成形回転軸上に、先行する帯状材部の一側部上に後続する帯状材部の他側部を重ね合わせながら一定のピッチでもって螺旋巻きすることにより軟質合成樹脂製管体を形成していくと共にこの軟質合成樹脂製管体上に、一定幅と厚みを有する半溶融状態の硬質合成樹脂製帯状材を先行する帯状材部の一側端面に後続する帯状材の他側端面を接合、融着させながら一定のピッチでもって螺旋巻きすることにより所定長さの硬質合成樹脂製筒体部を形成し、引き続いて上記硬質合成樹脂製帯状材を押し出す成形ノズルからの押し出し量を少なくする等によって幅狭い断面矩形状の補強材に形成しながら上記と同一ピッチでもって軟質合成樹脂製管体の所定長さ部分に螺旋巻きすることにより硬質合成樹脂製螺旋突条を形成する。 Furthermore, as a method for manufacturing a synthetic resin connecting pipe as described above, for example, in Patent Document 1, a semi-molten soft synthetic resin strip having a certain width and thickness precedes on a molding rotating shaft. A soft synthetic resin tube is formed by spirally winding at a constant pitch while superimposing the other side portion of the following belt-like material portion on one side portion of the belt-like material portion. On the body, a semi-molten hard synthetic resin strip having a certain width and thickness is joined at a constant pitch while joining and fusing the other end surface of the strip member following the one end surface of the preceding strip member portion. Reinforcement of a rectangular section with a narrow cross-section by forming a hard synthetic resin cylindrical body portion of a predetermined length by spiral winding and subsequently reducing the amount of extrusion from the molding nozzle for extruding the hard synthetic resin strip-like material Formed on material While forming a hard synthetic resin helical ridge by helically winding a predetermined length of the soft synthetic resin tube with the above and the same pitch.

そして、成形回転軸上に連続的に形成する軟質合成樹脂製管体上に、上記所定長さの硬質合成樹脂製筒体部と硬質合成樹脂製螺旋突条を交互に形成しながら、硬質合成樹脂製筒体部の長さ方向の中央部から軟質合成樹脂製管体を切断することによって、一定長さの軟質合成樹脂製管の両端部外周面に上記硬質合成樹脂製筒体部の分割による硬質合成樹脂製継手部を設け、且つ、これらの硬質合成樹脂製継手部間に硬質合成樹脂製螺旋突条を設けてなる合成樹脂製接続用管を順次、製造している。 Then, on the soft synthetic resin tubular body continuously formed on the molding rotating shaft, the hard synthetic resin cylindrical body portion and the hard synthetic resin spiral ridge of the predetermined length are alternately formed, and the hard synthetic resin is formed. By dividing the soft synthetic resin tube from the central portion in the length direction of the resin tube, the hard synthetic resin tube is divided into the outer peripheral surfaces of both ends of the fixed length of the soft synthetic resin tube. The synthetic resin connecting pipes are sequentially manufactured by providing the hard synthetic resin joint portions by the above and providing the hard synthetic resin spiral ridges between the hard synthetic resin joint portions.

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

しかしながら、前者のように両端部に硬質合成樹脂製継手部を設けている可撓性を有する合成樹脂製ホースによれば、空調機や流し台のトラップ排水口のように硬質の排水口にその一端継手部を嵌合させても両者は硬質であるから、互いに滑りが生じて接続が困難となり、そのため、接着剤を使用して一体に接続しなければならず、その接続作業に手間を要するばかりでなく、一旦、接着によって接続させると、交換や保守、点検等に困難をきたすことになる。 However, according to the flexible synthetic resin hose having the rigid synthetic resin joints at both ends as in the former, one end of the rigid drainage port is used as a trap drainage port of an air conditioner or a sink. Even if the joint part is fitted, both are hard, so they slip and become difficult to connect. For this reason, it is necessary to connect them together using an adhesive, which requires much labor for the connection work. Instead, once they are connected by bonding, it will be difficult to replace, maintain and inspect.

さらに、耐圧強度を持たせるために、軟質合成樹脂製管体の外周面に硬質合成樹脂製補強材を螺旋状に巻着しているが、この硬質合成樹脂製補強材は軟質合成樹脂製管体の外周面と対向する面を全幅に亘って全面的に軟質合成樹脂製管体の外周面に融着させているために、この補強材の幅に相当する軟質合成樹脂製管体の管壁部分が補強材によって剛直化されて管を湾曲させた場合に発生する引張力や圧縮力を吸収することができず、軟質合成樹脂製管体の可撓性が阻害されると共に曲げによって部分的に引張力や圧縮力による応力が集中的に残留して長期の使用中にその部分から破断が生じるといった問題点がある。 Furthermore, in order to give pressure resistance strength, a hard synthetic resin reinforcing material is spirally wound around the outer peripheral surface of the soft synthetic resin tube body. This hard synthetic resin reinforcing material is a soft synthetic resin pipe. Since the entire surface of the body facing the outer peripheral surface of the body is fused to the entire outer peripheral surface of the soft synthetic resin tube, the tube of the soft synthetic resin tube corresponding to the width of the reinforcing material It cannot absorb the tensile force or compressive force generated when the wall part is stiffened by a reinforcing material to bend the pipe, and the flexibility of the soft synthetic resin tube is obstructed and the part is bent. In particular, there is a problem that stress due to tensile force or compressive force remains intensively and breaks from the portion during long-term use.

一方、後者のように両端部に軟質合成樹脂製継手部を設けている可撓性を有する合成樹脂製ホースによれば、その一端側の軟質合成樹脂製継手部を硬質の排水口に被嵌させることにより、その内周面を弾性的に圧着させて接着剤を使用することなく強固に接続することができるが、その他端側に接続させる排水管は、通常、軟質合成樹脂製管であるため、この軟質合成樹脂製管の端部にその他端側の軟質合成樹脂製継手部を直接、接続させることができない。 On the other hand, according to the flexible synthetic resin hose having the soft synthetic resin joints at both ends as in the latter case, the soft synthetic resin joint at one end is fitted into the hard drain port. By doing so, the inner peripheral surface can be elastically pressure-bonded and firmly connected without using an adhesive, but the drain pipe connected to the other end side is usually a soft synthetic resin pipe. For this reason, the soft synthetic resin joint portion at the other end cannot be directly connected to the end portion of the soft synthetic resin tube.

そのため、軟質合成樹脂製継手部と排水ホースの端部とのいずれかに硬質の継手管を取付け、この継手管を介して両者を接続しなければならず、構造が複雑化してコスト高になると共にその接続作業に手間を要するといった問題点がある。 Therefore, a hard joint pipe must be attached to either the soft synthetic resin joint part or the drain hose end, and both must be connected via this joint pipe, resulting in a complicated structure and high cost. At the same time, there is a problem that the connection work requires labor.

また、上記合成樹脂製接続用管の製造方法によれば、成形回転軸上に軟質合成樹脂製管体を形成しながらこの軟質合成樹脂製管体の外周面に断面矩形状等の一定幅と厚みを有する硬質合成樹脂製補強材を該軟質合成樹脂製管体上に一定のピッチでもって螺旋巻きすることにより耐圧性を付与された可撓性を有する合成樹脂製接続用管を形成しているが、硬質合成樹脂製補強材はその厚み方向及び幅方向に変形不能な断面形状を有しているため、上述したように、軟質合成樹脂製管体は螺旋状に巻着したこの硬質合成樹脂製補強材間から露出している管壁部分でしか可撓性を発揮するができなくなり、円滑な可撓性を有する接続管を製造することが困難である。 Further, according to the synthetic resin connecting pipe manufacturing method, while forming the soft synthetic resin tube on the molding rotating shaft, the outer surface of the soft synthetic resin tube has a constant width such as a rectangular cross section. A flexible synthetic resin connecting tube having a pressure resistance is formed by spirally winding a hard synthetic resin reinforcing material having a thickness on the soft synthetic resin tube body at a constant pitch. However, since the rigid synthetic resin reinforcing material has a cross-sectional shape that cannot be deformed in the thickness direction and the width direction, as described above, the soft synthetic resin tubular body is wound in a spiral shape. Flexibility can be exhibited only at the tube wall portion exposed between the resin reinforcing materials, and it is difficult to manufacture a connecting tube having smooth flexibility.

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充分な耐圧強度を有すると共に優れた可撓性、湾曲性を備え、さらに、硬質の排水口と軟質合成樹脂製排水管とを容易に且つ確実に接続させることができる合成樹脂製接続用管と、この合成樹脂製接続用管を能率よく安価に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. The object of the present invention is to have a sufficient pressure resistance and an excellent flexibility and bendability, and further, a hard drain port and a soft synthetic resin. The object is to provide a synthetic resin connecting pipe capable of easily and reliably connecting a drainage pipe and a manufacturing method capable of efficiently and inexpensively manufacturing the synthetic resin connecting pipe.

上記目的を達成するために本発明の合成樹脂製接続用管は請求項１に記載したように、一定径を有する軟質合成樹脂製管主体の両端部を除く外周面に断面Ｕ字状の硬質合成樹脂製螺旋突条を一定のピッチでもって巻回して該螺旋突条の両端フランジ部を軟質合成樹脂製管主体の外周面に一体に融着していると共に、この軟質合成樹脂製管主体の一端部を該軟質合成樹脂製管主体の一部よりなる円筒形状の軟質継手部に形成し、且つ、この軟質継手部の外周面に上記硬質合成樹脂製螺旋突条と連続した薄肉で且つ小幅の硬質合成樹脂製細幅帯材を上記硬質合成樹脂製螺旋突条と同一ピッチでもって螺旋状に巻着している一方、他端部を、上記軟質合成樹脂製管主体の他端部を内層としてその外周面に、上記硬質合成樹脂製螺旋突条に連続してこの硬質合成樹脂製螺旋突条を平帯状に展開変形させた硬質合成樹脂製帯状材を隙間なく螺旋状に巻着することにより一定厚みの硬質合成樹脂製外層を設けてなる円筒形状の硬質継手部に形成していることを特徴とする。

In order to achieve the above object, the synthetic resin connecting pipe according to the present invention is a rigid pipe having a U-shaped cross section on the outer peripheral surface excluding both ends of a soft synthetic resin pipe main body having a constant diameter. The synthetic resin spiral ridge is wound at a constant pitch, and both end flange portions of the spiral ridge are integrally fused to the outer peripheral surface of the soft synthetic resin pipe main body, and the soft synthetic resin pipe main body Is formed into a cylindrical soft joint portion made of a part of the soft synthetic resin pipe main body, and the outer peripheral surface of the soft joint portion is thin and continuous with the hard synthetic resin spiral ridge. A narrow band made of hard synthetic resin is wound spirally at the same pitch as the hard synthetic resin spiral ridge, while the other end is the other end of the soft synthetic resin tube main body. As an inner layer, the outer surface is continuously connected to the hard synthetic resin spiral ridge. Cylindrical hard joint with a hard synthetic resin outer layer with a constant thickness by winding a hard synthetic resin strip that is developed and deformed into a flat strip in a spiral shape. It is characterized by being formed.

請求項２に係る発明は、上記合成樹脂製接続用管の製造方法であって、第１成形ノズルから半溶融状態の軟質合成樹脂製帯状材を押し出して成形回転軸上にこの半溶融状態の軟質合成樹脂製帯状材を螺旋巻きすることにより、一定厚みを有する軟質合成樹脂製管部を形成する一方、第２成形ノズルから半溶融状態の硬質合成樹脂製帯状材を押し出して、この硬質合成樹脂製帯状材の幅方向の中央部に、該硬質合成樹脂製帯状材が成形回転軸に達する手前に上下方向に移動自在に配設している成形部材の幅方向の中央部に突設した突条部を押し付けることにより、該硬質合成樹脂製帯状材を断面Ｕ字状に湾曲成形させながら、この断面Ｕ字状の硬質合成樹脂製突条を上記軟質合成樹脂製管部の外周面に一定のピッチでもって螺旋巻きしてその両端フランジ部を軟質合成樹脂製管部の外周面に融着させることにより硬質合成樹脂製螺旋突条を設ける工程と、成形回転軸上に上記半溶融状態の軟質合成樹脂製帯状材を連続的に螺旋巻きすることにより、一定長さの軟質筒体部を形成する一方、上記第２成形ノズルから押し出される硬質合成樹脂製帯状材の幅及び厚みを減少させて硬質合成樹脂製細幅帯材に成形しながらこの硬質合成樹脂製細幅帯材を、上記成形回転軸上に連続形成される上記軟質筒体部に、上記硬質合成樹脂製突条と同一ピッチでもって螺旋状に巻着する工程と、軟質合成樹脂製管部の外周面に再び上記半溶融状態の硬質合成樹脂製螺旋突条を螺旋巻きしてその両端フランジ部を軟質合成樹脂製管部の外周面に融着させることにより硬質合成樹脂製螺旋突条を設ける工程と、この工程に引き続いて成形回転軸上に上記半溶融状態の軟質合成樹脂製帯状材を連続的に螺旋巻きして一定長さの軟質合成樹脂製管部を形成すると共にこの軟質合成樹脂製管部の外周面に半溶融状態の上記硬質合成樹脂製突条を偏平帯状にしてなる該硬質合成樹脂製帯状材を螺旋巻きすることにより硬質筒体部を形成する工程とを繰り返し行い、上記軟質筒体部と硬質筒体部との長さ方向の中央部を順次切断することにより、外周面に硬質合成樹脂製螺旋突条を巻着している軟質合成樹脂製管主体の一端部に円筒形状の軟質継手部を、他端部に円筒形状の硬質継手部を設けてなる管を製造することを特徴とする。 The invention according to claim 2 is a method of manufacturing the synthetic resin connecting pipe, the semi-molten state from the first molding nozzle on the molding rotating shaft extruding soft synthetic resin strip material in a semi-molten state The soft synthetic resin strip is spirally wound to form a soft synthetic resin tube having a constant thickness, while the hard synthetic resin strip in a semi-molten state is extruded from the second molding nozzle. At the center of the width direction of the resin strip material, the hard synthetic resin strip material protrudes from the center portion of the width direction of the molding member disposed so as to be movable in the vertical direction before reaching the molding rotation axis. By pressing the ridge portion, the hard synthetic resin strip is curved and formed into a U-shaped cross section , and the hard synthetic resin ridge having the U-shaped cross section is formed on the outer peripheral surface of the soft synthetic resin tube portion. Both of them spirally wound at a constant pitch The process of providing a hard synthetic resin spiral ridge by fusing the flange part to the outer peripheral surface of the soft synthetic resin pipe part, and the semi-molten soft synthetic resin belt-like material continuously on the molding rotating shaft By spirally winding, a fixed length soft cylindrical body part is formed, while the width and thickness of the rigid synthetic resin strip extruded from the second molding nozzle is reduced to form a rigid synthetic resin narrow strip A step of winding the hard synthetic resin narrow band material in a spiral manner at the same pitch as the hard synthetic resin protrusions on the soft cylindrical body portion continuously formed on the molding rotating shaft while forming. And by spirally winding the semi-molten hard synthetic resin spiral ridge on the outer peripheral surface of the soft synthetic resin pipe portion and fusing both end flange portions to the outer peripheral surface of the soft synthetic resin pipe portion. Process for providing hard synthetic resin spiral ridges Subsequent to this step, the semi-molten soft synthetic resin strip is continuously spirally wound on the molding rotating shaft to form a soft synthetic resin pipe portion of a certain length and this soft synthetic resin pipe A step of forming a hard cylindrical portion by spirally winding the hard synthetic resin strip in a semi-molten state on the outer peripheral surface of the portion in a flat strip shape, A cylindrical portion is formed at one end of a soft synthetic resin pipe main body in which a hard synthetic resin spiral ridge is wound around an outer peripheral surface by sequentially cutting a central portion in a length direction of the cylindrical body portion and the hard cylindrical body portion. It is characterized by manufacturing a pipe having a shape-shaped soft joint portion and a cylindrical hard joint portion at the other end.

請求項１に係る発明によれば、合成樹脂製接続用管における一端部を円筒形状の軟質継手部に、他端部を円筒形状の硬質継手部に形成しているので、この合成樹脂性接続用管によって硬質排水口と軟質合成樹脂よりなる排水管とを接続する場合、その一端側の軟質継手部を上記硬質排水口に直接、被嵌させることによって弾性シール材などを使用することなく容易に且つ強固に圧着した状態で接続することができ、同様に、他端部の硬質継手部を軟質合成樹脂製排水管の端部に挿嵌させることによって容易に且つ強固に接続することができるものであり、従って、排水管路等における硬質の管路と軟質の管路間を本発明の合成樹脂性接続用管によって別に継手部材などを使用することなく確実に能率よく接続することができる。 According to the first aspect of the present invention, one end of the synthetic resin connecting pipe is formed in the cylindrical soft joint and the other end is formed in the cylindrical hard joint. When connecting a hard drainage port and a drainage pipe made of soft synthetic resin with a pipe for use, it is easy to fit directly on the hard drainage port with a soft joint on one end without using an elastic sealant In the same manner, it can be connected in a firmly crimped state, and similarly, it can be easily and firmly connected by inserting the hard joint portion at the other end into the end of the soft synthetic resin drain pipe. Therefore, it is possible to reliably and efficiently connect between the hard pipe and the soft pipe in the drain pipe or the like without using a joint member or the like by the synthetic resin connection pipe of the present invention. .

さらに、合成樹脂性接続用管は、上記両端継手部間の軟質合成樹脂製管主体の外周面に断面Ｕ字状に湾曲している硬質合成樹脂製螺旋突条を一体に融着しているので、断面二次モーメントが大きくなってこの硬質合成樹脂製螺旋突条の厚みが薄くても優れた耐圧強度を発揮することができるばかりでなく材料費用の削減と軽量化を図ることができる。その上、この断面Ｕ字状の硬質合成樹脂製螺旋突条の両端フランジ部を軟質合成樹脂製管体の外周面に一体に融着させているので、合成樹脂製接続用管を湾曲させた場合に発生する引張力や圧縮力によって硬質合成樹脂製螺旋突条の両端フランジ部間が、引張力が作用する凸円弧状に湾曲する外側周面においては拡開変形し、圧縮力が作用する凹円弧状に湾曲する内側周面においては狭まる方向に変形しながら引張力や圧縮力を吸収することができ、合成樹脂製接続用管が湾曲した部分における軟質合成樹脂製管体の全長に亘って引張力や圧縮力を略均一に分散させて長期の使用に供することができると共に優れた可撓性を発揮することができる。 Further, the synthetic resin connecting pipe is integrally fused with a hard synthetic resin spiral ridge curved in a U-shaped cross section on the outer peripheral surface of the soft synthetic resin pipe main body between the joints at both ends. Therefore, even if the cross-sectional secondary moment is increased and the thickness of the hard synthetic resin spiral ridge is thin, not only excellent pressure strength can be exhibited, but also the material cost can be reduced and the weight can be reduced. In addition, since both end flanges of the hard synthetic resin spiral ridge having a U-shaped cross section are integrally fused to the outer peripheral surface of the soft synthetic resin tubular body, the synthetic resin connecting pipe is curved. The outer peripheral surface curved in a convex arc shape where the tensile force acts is expanded and deformed between the flanges at both ends of the hard synthetic resin spiral ridge due to the tensile force and compressive force generated in some cases, and the compressive force acts The inner peripheral surface curved in a concave arc shape can absorb tensile force and compressive force while deforming in a narrowing direction, and covers the entire length of the soft synthetic resin tube body in the curved portion of the synthetic resin connecting tube. Thus, the tensile force and the compressive force can be dispersed substantially uniformly and used for a long period of time, and excellent flexibility can be exhibited.

請求項２に係る発明は、上記合成樹脂製接続用管の製造方法に関するもので、成形回転軸上に一定幅と一定厚みを有する半溶融状態の軟質合成樹脂製帯状材を螺旋巻きして一定厚みを有する軟質合成樹脂製管部を形成しながら、この軟質合成樹脂製管部の外周面に半溶融状態の断面Ｕ字状の硬質合成樹脂製突条を螺旋巻きして硬質合成樹脂製螺旋突条を形成する工程と、この硬質合成樹脂製螺旋突条を設けることなく上記半溶融状態の軟質合成樹脂製帯状材の連続螺旋巻きによる一定長さの軟質筒体部を形成する工程と、この軟質筒体部から連続的に形成される軟質合成樹脂製管部の外周面に再び上記半溶融状態の断面Ｕ字状の硬質合成樹脂製突条を螺旋巻きして硬質合成樹脂製螺旋突条を設ける工程と、この工程に引き続いて半溶融状態の上記硬質合成樹脂製突条を偏平帯状に変形させて該硬質合成樹脂製帯状材を螺旋巻きすることにより硬質筒体部を形成する工程とを繰り返し行い、上記軟質筒体部と硬質筒体部との長さ方向の中央部を順次、切断していくものであるから、外周面に断面Ｕ字条の硬質合成樹脂製螺旋突条を巻着している軟質合成樹脂製管主体の一端部に円筒形状の軟質継手部を、他端部に円筒形状の硬質継手部を設けてなる多数本の合成樹脂製接続用管を連続自動的に能率よく製造することができて製造コストや製品コストの低減を図ることができると共に、全ての合成樹脂製接続用管を均質にして不良品の発生をなくすることができる。 The invention according to claim 2 relates to a method for manufacturing the above-mentioned synthetic resin connecting pipe, and is formed by spirally winding a semi-molten soft synthetic resin strip having a certain width and certain thickness on a molding rotating shaft. While forming a soft synthetic resin pipe portion having a thickness, a hard synthetic resin spiral is formed by spirally winding a semi-molten U-shaped hard synthetic resin protrusion on the outer peripheral surface of the soft synthetic resin pipe portion. A step of forming a ridge, and a step of forming a soft cylindrical portion of a certain length by continuous spiral winding of the soft synthetic resin strip in the semi-molten state without providing the hard synthetic resin spiral ridge, The semi-molten U-shaped hard synthetic resin protrusion is spirally wound again on the outer peripheral surface of the soft synthetic resin pipe portion formed continuously from the soft cylindrical body portion, and the hard synthetic resin helical protrusion is wound. The step of providing the strip and the semi-molten state following this step The step of forming a hard cylindrical portion by deforming the hard synthetic resin protrusion into a flat strip shape and spirally winding the hard synthetic resin strip-like material, and the soft cylindrical portion and the hard cylindrical portion are repeated. The central portion in the length direction is cut sequentially, so that one end of the soft synthetic resin pipe main body in which a hard synthetic resin spiral ridge having a U-shaped cross section is wound on the outer peripheral surface is provided. A large number of synthetic resin connecting pipes with a cylindrical soft joint part and a cylindrical hard joint part provided at the other end can be manufactured continuously and efficiently. Reduction can be achieved, and all the synthetic resin connecting pipes can be made uniform to eliminate generation of defective products.

さらに、合成樹脂製接続用管の内径や長さ、及び、この合成樹脂製接続用管の両端部に一体に形成している硬質継手部と軟質継手部との内径や長さは、成形回転軸の径とこの成形回転軸に連続形成する軟質合成樹脂製管部の外周面に巻着する硬質合成樹脂製螺旋突条の巻着長さや硬質合成樹脂製帯状材の巻着長さ、硬質合成樹脂製螺旋突条を設けない軟質合成樹脂製帯状材による螺旋巻き長さによって容易に且つ正確に所望の長さに設定することができる。 Furthermore, the inner diameter and length of the synthetic resin connecting pipe, and the inner diameter and length of the hard joint part and the soft joint part integrally formed at both ends of the synthetic resin connecting pipe are determined by molding rotation. The diameter of the shaft, the winding length of the hard synthetic resin spiral ridge wound around the outer peripheral surface of the soft synthetic resin pipe portion continuously formed on this molding rotating shaft, the winding length of the hard synthetic resin strip, and the hard The desired length can be easily and accurately set by the helical winding length of the soft synthetic resin strip-like material without the synthetic resin spiral protrusion.

その上、成形回転軸上に軟質合成樹脂製帯状材を螺旋巻きすることによって形成された軟質合成樹脂製管部上に一定のピッチでもって螺旋巻きする上記硬質合成樹脂製螺旋突条は断面Ｕ字状に形成されているので、この硬質合成樹脂製中空螺旋突条の肉厚が薄くても耐圧強度に優れた中空螺旋突条を得ることができ、従って、材料費の削減によるコストの低減と軽量化を図ることができる。 In addition, the hard synthetic resin spiral ridge spirally wound at a constant pitch on the soft synthetic resin pipe formed by spirally winding a soft synthetic resin strip on the molding rotating shaft has a cross-section U Since it is formed in a letter shape, it is possible to obtain a hollow spiral ridge excellent in pressure strength even if the thickness of this rigid synthetic resin hollow spiral ridge is thin, thus reducing the cost by reducing the material cost And weight reduction.

また、本発明によれば、硬質合成樹脂製螺旋突条は、硬質合成樹脂製帯状材の幅方向の中央部を該硬質合成樹脂製帯状材が成形回転軸に達する手前に上下方向に移動自在に配設している成形部材の幅方向の中央部に突設した突条部を押し付けることにより、断面Ｕ字状に湾曲させられるものであるから、この螺旋突条の両端フランジ部間の幅が硬質合成樹脂製帯状材の幅よりも狭くなってその狭くなる幅に応じて軟質合成樹脂製管部上に先に巻回した螺旋突条部と次に巻回した螺旋突条部との間に軟質合成樹脂製管部の管壁部分を露出させることができ、この露出幅が断面Ｕ字状の湾曲した螺旋突条の高さが高くなる程拡大して良好な可撓性を発揮し、大きく湾曲させて継手作業が容易に行え、且つ、その高さの増大によって優れた耐圧強度を発揮する合成樹脂製接続用管を得ることができる。 Further, according to the present invention , the hard synthetic resin spiral ridge is movable in the vertical direction at the central portion in the width direction of the hard synthetic resin strip before the hard synthetic resin strip reaches the molding rotation axis. The width between the flanges at both ends of the spiral ridge is curved by pressing the ridge protruding from the central portion in the width direction of the molded member arranged in the U-shaped section. Is narrower than the width of the hard synthetic resin belt-shaped material, and depending on the narrowing width, the spiral ridge portion wound first on the soft synthetic resin tube portion and the spiral ridge portion wound next The tube wall part of the soft synthetic resin tube part can be exposed in between, and the exposed width expands as the height of the curved spiral ridge with a U-shaped cross section increases, and exhibits good flexibility The joint can be easily bent and bent, and the height is increased, resulting in superior compressive strength. It can be obtained synthetic resin connecting pipe to exert.

さらに、成形回転軸上に該半溶融状態の硬質合成樹脂製帯状材を送り込む途上において上下方向に移動自在に配設した成形部材の中央部に突設した突条部を、この硬質合成樹脂製帯状材の幅方向の中央部に押しつけることにより該硬質合成樹脂製帯状材を断面Ｕ字状に湾曲させるものであるから、成形部材の突条部の断面形状に応じた形状に簡単且つ正確に連続的に湾曲させながら軟質合成樹脂製管部上に送り込むことができると共に、断面Ｕ字状に形成された硬質合成樹脂製螺旋突条の両端部は、硬質合成樹脂製帯状材の両端縁部からなるフランジ部に形成されているので、このフランジ部を介して硬質合成樹脂製螺旋突条を軟質合成樹脂製管部の外周面に確実且つ強固に融着一体化させることができ、その上、この硬質合成樹脂製帯状材に成形部材を押しつけている時間によって軟質合成樹脂製管部の外周面に形成すべき硬質合成樹脂製螺旋突条の巻装長さ、即ち、該螺旋突条を巻着する軟質合成樹脂製管体部分の長さを正確に設定することができる。 In addition, a protrusion protruding from the center portion of the molding member disposed so as to be movable in the vertical direction in the course of feeding the semi-molten hard synthetic resin belt-like material onto the molding rotating shaft is made of this hard synthetic resin. The hard synthetic resin belt-shaped material is curved into a U-shaped cross-section by pressing it against the central portion in the width direction of the belt-shaped material. Both ends of the hard synthetic resin spiral ridge formed in a U-shaped cross section can be fed to both ends of the hard synthetic resin strip while being continuously bent. The rigid synthetic resin spiral ridge can be securely and firmly fused and integrated with the outer peripheral surface of the soft synthetic resin pipe portion via the flange portion. , This hard synthetic resin strip The winding length of the hard synthetic resin spiral ridge to be formed on the outer peripheral surface of the soft synthetic resin pipe portion according to the time during which the molded member is pressed, that is, the soft synthetic resin tubular body around which the helical ridge is wound The length of the part can be set accurately.

また、上記成形部材を下動させて半溶融状態の硬質合成樹脂製帯状材の下面から離間させることにより、軟質合成樹脂製管体の外周面に、硬質継手部を得るためのこの硬質合成樹脂製帯状材による硬質筒体部を硬質合成樹脂製螺旋突条から連続して円滑に形成することができ、且つ、この硬質筒体部の長さを硬質合成樹脂製帯状材からの成形部材の離間時間によって正確に設定することができる。 Moreover, this hard synthetic resin for obtaining a hard joint part on the outer peripheral surface of a soft synthetic resin tubular body by moving the molded member downward and separating it from the lower surface of the semi-molten hard synthetic resin strip. The rigid cylindrical body portion made of the strip-shaped material can be formed continuously and smoothly from the hard synthetic resin spiral ridge, and the length of the rigid cylindrical body portion of the molded member from the rigid synthetic resin strip-shaped material It can be accurately set according to the separation time.

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合成樹脂製接続用管Ａの一部を切除した縦断側面図、図２はその側面図であって、この合成樹脂製接続用管Ａは、内周面及び外周面を全長に亘ってそれぞれ同一径の平滑な面に形成している一定厚みを有する一定長さの軟質合成樹脂製管主体１の一端部を軟質継手部２に、他端部を硬質継手部３に形成していると共に、軟質合成樹脂製管主体１の両端部を除く外周面、即ち、軟質継手部２と硬質継手部３間の軟質合成樹脂製管主体１の外周面に断面Ｕ字状に湾曲した硬質合成樹脂製螺旋突条４を一定のピッチでもって巻回して該硬質合成樹脂製螺旋突条４の両端フランジ部4a、4aを軟質合成樹脂製管主体１の外周面に融着させることにより、軟質合成樹脂製管主体１による可撓性と硬質合成樹脂製螺旋突条４による耐圧強度を備えた構造を有している。 Next, a specific embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a longitudinal side view of a part of a synthetic resin connecting tube A having a certain length, and FIG. 2 is a side view thereof. The synthetic resin connecting pipe A is composed mainly of a soft synthetic resin pipe having a certain length and having a constant thickness, the inner circumferential surface and the outer circumferential surface being formed on smooth surfaces having the same diameter over the entire length. 1 is formed with a soft joint portion 2 and the other end is formed with a hard joint portion 3, and the outer peripheral surface excluding both ends of the soft synthetic resin pipe main body 1, that is, the soft joint portion 2 and the hard joint. A hard synthetic resin spiral ridge 4 curved in a U-shaped cross section is wound around the outer peripheral surface of the soft synthetic resin pipe main body 1 between the portions 3 at a constant pitch, and both ends of the hard synthetic resin spiral ridge 4 are wound. By fusing the flanges 4a and 4a to the outer peripheral surface of the soft synthetic resin pipe main body 1, the soft synthetic resin It has a structure provided with flexibility by the pipe-making main body 1 and pressure resistance by the hard synthetic resin spiral protrusion 4.

軟質合成樹脂製管主体１は、軟質塩化ビニル樹脂や軟質のＥＶＡ樹脂、ポリエチレン樹脂、ポリプロピレン樹脂などの軟質合成樹脂からなり、適度の可撓性と弾性を有している一方、硬質合成樹脂製螺旋突条４は、硬質塩化ビニル樹脂や硬質のポリエチレン樹脂、ポリプロピレン樹脂等の硬質合成樹脂であって軟質合成樹脂製管１を形成する軟質合成樹脂と融着可能な硬質合成樹脂材からなる。 The soft synthetic resin tube main body 1 is made of a soft synthetic resin such as a soft vinyl chloride resin, a soft EVA resin, a polyethylene resin, or a polypropylene resin, and has appropriate flexibility and elasticity, while it is made of a hard synthetic resin. The spiral protrusion 4 is made of a hard synthetic resin material that can be fused with a soft synthetic resin that forms a soft synthetic resin pipe 1, which is a hard synthetic resin such as a hard vinyl chloride resin, a hard polyethylene resin, or a polypropylene resin.

上記軟質継手部２は、軟質合成樹脂製管主体１の一部である一端部によって内周面が該軟質合成樹脂製管主体１の内周面に面一状に連続した円筒形状に形成されているが、その肉厚は軟質合成樹脂製管主体１と同じ、即ち、軟質合成樹脂製管主体１の外径と同一外径に必ずしも形成しておく必要はなく、軟質合成樹脂製管主体１よりも大径にして軟質合成樹脂製管主体１よりも厚く形成しておいてもよい。また、この軟質継手部２の外周面には、上記硬質合成樹脂製螺旋突条４と連続した薄肉で且つ小幅の硬質合成樹脂製細幅帯材42が硬質合成樹脂製螺旋突条４と同一ピッチでもって螺旋状に巻着していてその一部又は全部を軟質継手部２内に埋設してあり、この硬質合成樹脂製細幅帯材42によって軟質継手部２の柔軟性を損なわない程度に該軟質継手部２に保形強度を付与している。 The soft joint portion 2 is formed in a cylindrical shape whose inner peripheral surface is continuous with the inner peripheral surface of the soft synthetic resin pipe main body 1 by one end portion which is a part of the soft synthetic resin pipe main body 1. However, the wall thickness is the same as that of the soft synthetic resin pipe main body 1, that is, it is not necessarily formed to the same outer diameter as the outer diameter of the soft synthetic resin pipe main body 1. The diameter may be larger than 1, and may be formed thicker than the soft synthetic resin pipe main body 1. Further, on the outer peripheral surface of the soft joint portion 2, a thin and thin hard synthetic resin narrow strip 42 continuous with the hard synthetic resin spiral ridge 4 is the same as the hard synthetic resin spiral ridge 4. It is wound in a spiral shape with a pitch, and a part or all of it is embedded in the soft joint portion 2, and the flexibility of the soft joint portion 2 is not impaired by the hard synthetic resin narrow band member 42. In addition, shape retention strength is imparted to the soft joint portion 2.

上記硬質継手部３は、軟質合成樹脂製管主体１の一部である他端部を内層1aとしてこの内層1aの外周面に上記硬質合成樹脂製螺旋突条４を平帯状に展開変形させてなる硬質合成樹脂製帯状材41を隙間なく螺旋状に巻回して軟質合成樹脂製内層1aの外周面に一体に融着させることにより硬質合成樹脂製外層3aを形成し、これらの軟質合成樹脂製内層1aと硬質合成樹脂製外層3aとから円筒形状の硬質継手部３に形成されている。なお、硬質合成樹脂製外層3aを形成する上記硬質合成樹脂製帯状材41は、先に螺旋状に一巻きした帯状材部の一側端面に次に一巻きする帯状材部の他側端面を突き合わせ状に接合、融着させながら螺旋状に巻着することにより、外周面が平滑な円筒形状に形成しているが、先に螺旋状に一巻きした帯状材部の一側端部に次に一巻きする帯状材部の他側端部を重合させ、その重合部を成形ローラ等によって押圧して平坦な外周面に形成してもよい。 The hard joint portion 3 has the other end portion of the soft synthetic resin pipe main body 1 as an inner layer 1a, and the hard synthetic resin spiral ridge 4 is expanded and deformed into a flat belt shape on the outer peripheral surface of the inner layer 1a. A hard synthetic resin outer layer 3a is formed by spirally winding a hard synthetic resin belt-like material 41 to be formed and fusing it integrally to the outer peripheral surface of the soft synthetic resin inner layer 1a, and these soft synthetic resin A cylindrical hard joint portion 3 is formed from an inner layer 1a and a hard synthetic resin outer layer 3a. The above-mentioned hard synthetic resin belt-like material 41 forming the hard synthetic resin outer layer 3a has the other side end surface of the belt-like material portion wound next to the one side end surface of the belt-like material portion wound spirally first. Although the outer peripheral surface is formed into a smooth cylindrical shape by being spirally wound while being joined and fused in a butt shape, it is next to one side end of the strip-shaped material portion that has been spirally wound first. Alternatively, the other end portion of the belt-shaped material portion that is wound once may be polymerized, and the overlapping portion may be pressed by a forming roller or the like to form a flat outer peripheral surface.

軟質合成樹脂製管主体１の外周面に巻着している上記硬質合成樹脂製螺旋突条４は、上記硬質合成樹脂製帯状材41の幅方向の中央部を断面Ｕ字状ないしはトンネル状に湾曲させた形状を有していて、この硬質合成樹脂製螺旋突条４を上記硬質合成樹脂製帯状材41と同一ピッチでもって軟質合成樹脂製管主体１の外周面に螺旋巻きしてその両端フランジ部4a、4aを軟質合成樹脂製管主体１の外周面に融着させてなり、軟質合成樹脂製管主体１の外周面に向かって開口している断面Ｕ字状に湾曲した内部の溝状空間を軟質合成樹脂製管主体１の外周面によって閉塞させた状態にしてこの溝状空間により螺旋状に連続した中空部５を形成している。 The hard synthetic resin spiral ridge 4 wound around the outer peripheral surface of the soft synthetic resin pipe main body 1 has a U-shaped cross section or a tunnel shape at the center in the width direction of the hard synthetic resin strip 41. The hard synthetic resin spiral ridge 4 is spirally wound around the outer peripheral surface of the soft synthetic resin pipe main body 1 at the same pitch as the hard synthetic resin strip-like material 41 and has both ends thereof. Flange portions 4a, 4a are fused to the outer peripheral surface of the soft synthetic resin pipe main body 1 and are curved in an U-shaped section that opens toward the outer peripheral surface of the soft synthetic resin pipe main body 1 The hollow space 5 is formed in a spiral shape by the groove-like space with the hollow space closed by the outer peripheral surface of the soft synthetic resin pipe main body 1.

上述したように、硬質継手部３を形成する一定厚みと一定幅W1を有する硬質合成樹脂製帯状材41の中央部断面Ｕ字状に湾曲させると、この硬質合成樹脂製帯状材41の両側端面が幅方向の中央に向かって引き寄せられて両端フランジ部4a、4aの端面間の幅W2が上記硬質合成樹脂製帯状材41の幅W1よりもその引き寄せられた分だけ狭くなった硬質合成樹脂製螺旋突条４が形成されることになり、この硬質合成樹脂製螺旋突条４を硬質合成樹脂製帯状材41と同一ピッチでもって軟質合成樹脂製管主体１の外周面に巻着することによって、先に一巻き状に螺旋巻きした螺旋突条部4'と次に一巻き状に巻回した螺旋突条部4'との対向フランジ部4a、4a間に軟質合成樹脂製管主体１の管壁の一部を螺旋状に露出させた一定幅の間隔部６が連続螺旋状に形成されている。 As described above, when the rigid synthetic resin belt-like material 41 having a constant thickness and a constant width W1 forming the hard joint portion 3 is bent into a U-shaped central section, both end faces of the hard synthetic resin belt-like material 41 are formed. Made of a hard synthetic resin in which the width W2 between the end faces of both end flange portions 4a, 4a is narrower than the width W1 of the hard synthetic resin strip 41 by being drawn toward the center in the width direction. The spiral ridge 4 is formed, and the hard synthetic resin spiral ridge 4 is wound around the outer peripheral surface of the soft synthetic resin pipe main body 1 with the same pitch as the hard synthetic resin strip 41. The soft synthetic resin tube main body 1 is formed between the opposing flange portions 4a and 4a of the spiral ridge 4 'spirally wound first and the spiral ridge 4' wound next. A space 6 having a constant width in which a part of the tube wall is spirally exposed is formed in a continuous spiral. .

従って、この間隔部６に露出した軟質合成樹脂製管主体１の管壁部と断面Ｕ字状に湾曲した各螺旋突条部4'の両端フランジ部4a、4a間に露出した中空部５内の管壁部、即ち、軟質合成樹脂製管主体１の外周面に融着している両端フランジ部4a、4a以外の軟質合成樹脂製管主体１の管壁が可撓性を奏することになり、良好な可撓性を発揮する合成樹脂接続用管Ａを構成している。 Therefore, the inside of the hollow part 5 exposed between the pipe wall part of the soft synthetic resin pipe main body 1 exposed in the space part 6 and the both end flange parts 4a, 4a of each spiral protrusion 4 'curved in a U-shaped section. Tube wall portion, that is, the tube wall of the soft synthetic resin pipe main body 1 other than the both end flange parts 4a and 4a fused to the outer peripheral surface of the soft synthetic resin pipe main body 1 has flexibility. A synthetic resin connecting pipe A that exhibits good flexibility is formed.

管の長さ方向に隣接する上記螺旋突条部4'、4'間の間隔部６の幅は、上記断面Ｕ字状に湾曲した硬質合成樹脂製螺旋突条４の高さが高くなる程広くなり、その間隔部６の幅が広くなると合成樹脂製接続用管Ａの可撓性が一層良好になると共に該合成樹脂製接続用管Ａの湾曲度も大きくなり、その上、硬質合成樹脂製螺旋突条４の高さが高くなるとこの中空の螺旋突条４の断面二次モーメントが大きくなって耐圧強度が増大する。なお、断面Ｕ字状に湾曲している硬質合成樹脂製螺旋突条４としては、図１、２に示すように円弧状に湾曲した形状以外に、図３に示すように断面等脚台形状に形成しておいても、図４に示すように断面四角形状に形成しておいてもよい。 The width of the space 6 between the spiral ridges 4 'and 4' adjacent to each other in the length direction of the tube is such that the height of the hard synthetic resin spiral ridge 4 curved in a U-shaped section increases. When the space 6 becomes wider and the width of the gap 6 becomes wider, the flexibility of the synthetic resin connecting tube A becomes better and the degree of curvature of the synthetic resin connecting tube A increases. When the height of the spiral protrusion 4 is increased, the sectional moment of the hollow spiral protrusion 4 is increased, and the pressure resistance is increased. The hard synthetic resin spiral ridge 4 curved in a U-shaped cross section has an isosceles trapezoidal cross section as shown in FIG. 3 in addition to the shape curved in an arc as shown in FIGS. Even if they are formed, they may be formed in a quadrangular cross section as shown in FIG.

次に、上記のように構成した合成樹脂製接続用管Ａの製造方法を図５〜図11に基づいて説明すると、まず、図５、図６に示すように、第１成形ノズル71から一定幅と一定厚みを有する偏平な矩形断面に形成された半溶融状態の軟質塩化ビニル樹脂等の軟質合成樹脂製帯状材10を押し出しながら周知のように金属製の成形回転軸70の基端部上に、先に巻回した帯状材部10a と次に巻回する帯状材部10a との対向側部を重ね合わせて一体に融着させながら一定のピッチでもって螺旋巻きすることにより、内径が全長に亘って同一径で且つ一定厚みを有する薄肉の軟質合成樹脂製管部1'を形成していく。 Next, a method of manufacturing the synthetic resin connecting pipe A configured as described above will be described with reference to FIGS. 5 to 11. First, as shown in FIGS. As is well known, while extruding a strip 10 made of a soft synthetic resin such as a soft vinyl chloride resin in a semi-molten state formed in a flat rectangular section having a width and a constant thickness, on the base end of a metal molding rotary shaft 70 as is well known In addition, the inner diameter of the belt-shaped member 10a wound first and the next member 10a to be wound next are overlapped with each other and spirally wound at a constant pitch while being fused together. A thin-walled soft synthetic resin pipe portion 1 'having the same diameter and a constant thickness is formed.

さらに、この軟質合成樹脂製管部1'を形成しながら第２成形ノズル72から一定幅と一定厚みを有する偏平な矩形断面に形成された半溶融状態の硬質塩化ビニル樹脂等の硬質合成樹脂製帯状材41を押し出してこの硬質合成樹脂製帯状材41が成形回転軸70に達する前に、該硬質合成樹脂製帯状材41の下面における幅方向の中央部に、成形部材73の上面に突設している断面凸円弧状の突条部73a を押しつけることにより、該硬質合成樹脂製帯状材41を両端部にフランジ部4a、4aを有する断面Ｕ字状の突条41' に湾曲成形し、この硬質合成樹脂製突条41' を軟質合成樹脂製管部1'の外周面に一定のピッチでもって螺旋巻きしてその両端フランジ部4a、4aを軟質合成樹脂製管部1'の外周面に融着させることにより、軟質合成樹脂製管部1'の外周面に硬質合成樹脂製螺旋突条４を形成する。 Further, while forming this soft synthetic resin pipe portion 1 ', it is made of a hard synthetic resin such as a semi-molten hard vinyl chloride resin formed in a flat rectangular cross section having a constant width and a constant thickness from the second molding nozzle 72. Before the band 41 is extruded and the hard synthetic resin band 41 reaches the molding rotating shaft 70, it projects from the upper surface of the molding member 73 at the center in the width direction of the lower surface of the hard synthetic resin band 41. By pressing the projecting circular arc-shaped protrusion 73a having a cross section, the hard synthetic resin strip-shaped material 41 is bent into a U-shaped protrusion 41 'having flanges 4a and 4a at both ends, This hard synthetic resin protrusion 41 'is spirally wound around the outer peripheral surface of the soft synthetic resin pipe portion 1' at a constant pitch, and both end flange portions 4a, 4a are outer peripheral surfaces of the soft synthetic resin pipe portion 1 '. To the outer surface of the soft synthetic resin tube 1 '. To form an Article 4.

外周面に上記硬質合成樹脂製螺旋突条４を螺旋巻きしてなる軟質合成樹脂製管部1'を所望長さ形成すると、引き続いて図７に示すように、成形回転軸70上に半溶融状態の軟質合成樹脂製帯状材10を上記同様に先に巻回した帯状材部10a と次に巻回する帯状材部10a との対向側部を重ね合わせて一体に融着させながら同一ピッチでもって螺旋巻きすることにより、外周面に硬質合成樹脂製螺旋突条４を設けていない一定長さ（継手部の倍の長さ）の軟質筒体部2'を連続形成する。この軟質筒体部2'の形成時においては、上記第２成形ノズル72から押し出される硬質合成樹脂製帯状材41の幅及び厚みを減少させて極薄の硬質合成樹脂製細幅帯材42に成形すると共に上記成形部材73を下方に移動させてこの硬質合成樹脂製細幅帯材42の下面から下方に離間させた状態にして該硬質合成樹脂製細幅帯材42を、成形回転軸70上に連続形成される上記軟質筒体部2'に、上記硬質合成樹脂製突条41' と同一ピッチでもって螺旋状に巻回してその一部ないし全部を軟質筒体部2'を形成する軟質合成樹脂製管部1'の外周面に埋設状態にして融着させる。 When the desired length of the soft synthetic resin pipe portion 1 'formed by spirally winding the hard synthetic resin spiral ridge 4 on the outer peripheral surface is formed, as shown in FIG. At the same pitch, the opposite side portions of the strip-shaped material portion 10a wound earlier and the next-rolled strip-shaped material portion 10a are overlapped and fused together in the same manner as described above. Thus, the flexible cylindrical body 2 ′ having a constant length (double the length of the joint portion) in which the hard synthetic resin spiral protrusion 4 is not provided on the outer peripheral surface is continuously formed by spiral winding. At the time of forming the soft cylindrical portion 2 ', the width and thickness of the hard synthetic resin strip 41 extruded from the second molding nozzle 72 are reduced to form an extremely thin hard synthetic resin narrow strip 42. The molding member 73 is moved downward and moved away from the lower surface of the hard synthetic resin narrow strip 42 so that the rigid synthetic resin narrow strip 42 is formed into a molding rotary shaft 70. The soft cylindrical body portion 2 'continuously formed thereon is spirally wound at the same pitch as the hard synthetic resin protrusion 41' to form part or all of the soft cylindrical body portion 2 '. The soft synthetic resin pipe portion 1 'is buried in the outer peripheral surface and fused.

この軟質筒体部2'が成形回転軸70上に一定長さ形成されると、図８に示すように、成形回転軸70上に上記第１成形ノズル71から押し出される軟質合成樹脂製帯状材10を、先に巻回した帯状材部10a と次に巻回する帯状材部10a との対向側部を重ね合わせて一体に融着させながら一定のピッチでもって螺旋巻きすることにより上記軟質合成樹脂製管部1'を連続形成していく一方、上記第２成形ノズル72から押し出される硬質合成樹脂製帯材を細幅帯材42から再び上記一定幅と一定厚みを有する偏平な矩形断面に形成された半溶融状態の硬質合成樹脂製帯状材41に変形させると共に上記成形部材73を上動させてこの硬質合成樹脂製帯状材41が成形回転軸70に達する前に、上記同様に該硬質合成樹脂製帯状材41の下面における幅方向の中央部に、成形部材73の上面に突設している断面凸円弧状の突条部73a
を押しつけることにより、該硬質合成樹脂製帯状材41を両端部にフランジ部4a、4aを有する断面Ｕ字状の突条41' に湾曲成形し、この硬質合成樹脂製突条41' を成形回転軸70上に連続形成されていく上記軟質合成樹脂製管部1'の外周面に上記と同一ピッチでもって螺旋巻きしてその両端フランジ部4a、4aを軟質合成樹脂製管部1'の外周面に融着させることにより、軟質合成樹脂製管部1'の外周面に硬質合成樹脂製螺旋突条４を形成する。 When the soft cylindrical body portion 2 'is formed on the molding rotating shaft 70 by a certain length, as shown in FIG. 8, the soft synthetic resin strip-like material extruded from the first molding nozzle 71 onto the molding rotating shaft 70 is formed. 10 is spirally wound at a constant pitch while overlapping and fusing together the opposite side portions of the previously wound belt-like material portion 10a and the next belt-like material portion 10a to be wound. While continuously forming the resin pipe portion 1 ', the rigid synthetic resin strip extruded from the second molding nozzle 72 is again formed into a flat rectangular cross section having the constant width and constant thickness from the narrow strip 42. Before the hard synthetic resin strip 41 reaches the molding rotating shaft 70 by deforming the formed semi-molten hard synthetic resin strip 41 and moving the molding member 73 upward, At the center in the width direction on the bottom surface of the synthetic resin strip 41, Sectional convex arcuate protrusions 73a that protrude
Is pressed into a curved U-shaped protrusion 41 'having flanges 4a, 4a at both ends, and this rigid synthetic resin protruding line 41' is molded and rotated. The outer peripheral surface of the soft synthetic resin pipe portion 1 'continuously formed on the shaft 70 is spirally wound at the same pitch as described above, and both end flange portions 4a and 4a are connected to the outer periphery of the soft synthetic resin pipe portion 1'. By fusing to the surface, the hard synthetic resin spiral ridge 4 is formed on the outer peripheral surface of the soft synthetic resin pipe portion 1 '.

このように、外周面に上記硬質合成樹脂製螺旋突条４を螺旋巻きしてなる軟質合成樹脂製管部1'を所望長さ形成すると、図９に示すように、成形回転軸70上に上記第１成形ノズル71から押し出される軟質合成樹脂製帯状材10を、先に巻回した帯状材部10a と次に巻回する帯状材部10a との対向側部を重ね合わせて一体に融着させながら一定のピッチでもって螺旋巻きすることにより外周面に上記硬質合成樹脂製螺旋突条４を螺旋巻きしてなる軟質合成樹脂製管部1'よりも短い長さの軟質合成樹脂製管部1'' を連続形成する一方、上記成形部材73を下動させることによって第２成形ノズル72から押し出される上記半溶融状態の硬質合成樹脂製帯状材41を断面Ｕ字状に成形することなくその偏平帯状形状のまま上記軟質合成樹脂製管部1'' の外周面に、先に螺旋状に一巻きした帯状材部41a の一側端面に次に一巻きする帯状材部41a の他側端面を突き合わせ状に接合、融着させながら螺旋状に巻着することにより、外周面が平坦な一定長さ（継手部の倍の長さ）の硬質筒体部3'を連続形成していく。 As described above, when the desired length of the soft synthetic resin pipe portion 1 'formed by spirally winding the hard synthetic resin spiral ridge 4 is formed on the outer peripheral surface, as shown in FIG. The soft synthetic resin strip 10 extruded from the first molding nozzle 71 is fused in one piece by superimposing opposite sides of the strip 10a wound first and the strip 10a wound next. The soft synthetic resin pipe portion having a shorter length than the soft synthetic resin pipe portion 1 'formed by spirally winding the hard synthetic resin spiral ridge 4 on the outer peripheral surface by spirally winding at a constant pitch. 1 ″ is continuously formed, and the semi-molten hard synthetic resin strip 41 extruded from the second molding nozzle 72 by moving the molding member 73 downward is formed without forming a U-shaped cross section. On the outer peripheral surface of the soft synthetic resin pipe section 1 '' The outer peripheral surface is wound spirally while joining and fusing the other side end surface of the belt-like material part 41a wound next to the one side end surface of the belt-like material part 41a wound in a spiral shape. A hard cylindrical portion 3 ′ having a flat and constant length (double the length of the joint portion) is continuously formed.

この硬質筒体部3'が軟質合成樹脂製管部1'' の一定長さ部分の外周面上に形成されると図10に示すように、再び、軟質合成樹脂製管部1'を連続形成する一方、上記第２成形ノズル72から連続して押し出される上記半溶融状態の硬質合成樹脂製帯状材41が成形回転軸70に達する前に、この硬質合成樹脂製帯状材41の下面における幅方向の中央部に成形部材73の上面に突設している断面凸円弧状の突条部73a を押しつけることにより、該硬質合成樹脂製帯状材41を両端部にフランジ部4a、4aを有する断面Ｕ字状の突条41' に湾曲成形し、この硬質合成樹脂製突条41' を上記軟質合成樹脂製管部1'の外周面に一定のピッチでもって螺旋巻きしてその両端フランジ部4a、4aを軟質合成樹脂製管部1'の外周面に融着させることにより、軟質合成樹脂製管部1'の外周面に硬質合成樹脂製螺旋突条４を設けた所望長さの管部を形成する。 When the hard cylindrical portion 3 ′ is formed on the outer peripheral surface of the fixed length portion of the soft synthetic resin tube portion 1 '', as shown in FIG. 10, the soft synthetic resin tube portion 1 ′ is continuously connected again. On the other hand, before the semi-molten hard synthetic resin strip 41 extruded from the second molding nozzle 72 reaches the molding rotary shaft 70, the width of the lower surface of the hard synthetic resin strip 41 is reduced. A cross section having flange portions 4a, 4a at both ends of the rigid synthetic resin strip 41 by pressing a convex arcuate ridge 73a projecting on the upper surface of the molding member 73 at the center in the direction. The hard synthetic resin protrusion 41 'is curvedly formed into a U-shaped protrusion 41' and spirally wound around the outer peripheral surface of the soft synthetic resin pipe section 1 'at a constant pitch. , 4a is fused to the outer peripheral surface of the soft synthetic resin pipe portion 1 'to harden the outer surface of the soft synthetic resin pipe portion 1'. Forming a tube portion having a desired length in which a synthetic resin helical ridge 4.

上記成形部材73は図５、図６に示すように、硬質合成樹脂製帯状材41の幅と同等ないしは広幅で所定長さを有する長方形状の金属製板材からなり、この上面中央部に上記突条部73a を該成形部材73の長さ方向の一端から他端に向かって徐々に高くなるように形成されていると共に該突条部73a の両側方における成形部材73の両側端部上面を硬質合成樹脂製螺旋突条４のフランジ部4a、4aを形成するための平坦な面73b 、73b に形成している。 As shown in FIGS. 5 and 6, the molding member 73 is made of a rectangular metal plate material having a predetermined length equal to or wider than the width of the hard synthetic resin belt-like material 41. The strip portion 73a is formed so as to gradually increase from one end to the other end in the length direction of the molding member 73, and the upper surfaces of both end portions of the molding member 73 on both sides of the projection 73a are rigid. They are formed on flat surfaces 73b and 73b for forming the flange portions 4a and 4a of the spiral rib 4 made of synthetic resin.

そして、この成形部材73は第２成形ノズル72から押し出される硬質合成樹脂製帯状材41の下方において、その突条部73a の高さの低い端部側を第２成形ノズル72側に向けた状態にして流体圧シリンダ等の適宜な上下動手段により上下動自在に配設されてあり、硬質合成樹脂製螺旋突条４を形成する際にはこの成形部材73を上動させてこの成形部材73の上面に上記半溶融状態の偏平な硬質合成樹脂製帯状材41の下面を摺接させながら通過させ、その通過中に該突条部73a によって硬質合成樹脂製帯状材41の幅方向の中央部を徐々に上方に円弧状に湾曲させて断面Ｕ字状の硬質合成樹脂製突条41' に形成しながら通過させて上記軟質合成樹脂製管部1'の外周面にその両端フランジ部4a、4aを融着させることにより、硬質合成樹脂製螺旋突条４を形成していくものである。 The molding member 73 is in a state in which the lower end side of the protrusion 73a faces the second molding nozzle 72 side below the hard synthetic resin strip 41 extruded from the second molding nozzle 72. Thus, the molding member 73 is arranged to move up and down by an appropriate vertical movement means such as a fluid pressure cylinder. The lower surface of the semi-molten flat hard synthetic resin strip 41 is slidably contacted with the upper surface of the belt, and the central portion in the width direction of the hard synthetic resin strip 41 is formed by the protrusion 73a during the passage. Are gradually curved upward in a circular arc shape and passed through a hard synthetic resin protrusion 41 'having a U-shaped cross section, and both end flange portions 4a on the outer peripheral surface of the soft synthetic resin pipe portion 1', 4a is fused to form a hard synthetic resin spiral ridge 4 It is.

上記のように、硬質筒体部3'と硬質合成樹脂製螺旋突条４とは、第２成形ノズル72から押し出される一定幅と厚みを有する半溶融状態の硬質合成樹脂製帯状材41によって形成されるが、硬質合成樹脂製螺旋突条４はこの硬質合成樹脂製帯状材41を成形部材73の突条部73a によって上方に湾曲させられるので、その両側端面が幅方向の中央部に向かって引き寄せられて断面Ｕ字状ないしはトンネル状に湾曲した該硬質合成樹脂製突条41' の両側端面間の幅W2が上述したように上記硬質合成樹脂製帯状材41の幅W1よりもその引き寄せられた分だけ狭くなる。 As described above, the hard cylindrical portion 3 ′ and the hard synthetic resin spiral ridge 4 are formed by the semi-molten hard synthetic resin belt-like material 41 having a certain width and thickness extruded from the second molding nozzle 72. However, since the hard synthetic resin spiral ridge 4 is formed by bending the hard synthetic resin strip-like material 41 upward by the ridge 73a of the molding member 73, both side end faces thereof toward the central portion in the width direction. As described above, the width W2 between the end faces of the hard synthetic resin protrusion 41 'that is drawn and curved in a U-shaped section or a tunnel shape is drawn more than the width W1 of the hard synthetic resin strip 41. It becomes narrower by just that much.

従って、この硬質合成樹脂製突条41' を上記硬質筒体部3'を形成した硬質合成樹脂製帯状材41と同一ピッチでもって軟質合成樹脂製管部1'の外周面に螺旋状に巻着してその両側端部のフランジ部4a、4aを該軟質合成樹脂製管体1'に融着させることにより硬質合成樹脂製螺旋突条４を形成していくと、先に一巻き状に巻装した螺旋突条部4'の一側フランジ部4aと次に一巻き状に巻装した螺旋突条部4'の他側フランジ部4aととの間に上記引き寄せ量に相当する一定幅の間隔部６が連続螺旋状に形成され、この間隔部６から軟質合成樹脂製管部1'の管壁の一部が連続螺旋状に露出した状態となる。 Therefore, this hard synthetic resin protrusion 41 'is spirally wound around the outer peripheral surface of the soft synthetic resin pipe portion 1' at the same pitch as the hard synthetic resin strip material 41 having the hard cylindrical portion 3 'formed thereon. When the hard synthetic resin spiral ridge 4 is formed by fusing the flange portions 4a, 4a at both end portions thereof to the soft synthetic resin tube 1 ', A constant width corresponding to the pulling amount between the one side flange portion 4a of the wound spiral ridge portion 4 'and the other side flange portion 4a of the spiral ridge portion 4' wound next in a single winding shape. The interval portion 6 is formed in a continuous spiral shape, and a part of the tube wall of the soft synthetic resin tube portion 1 ′ is exposed in a continuous spiral shape from the interval portion 6.

こうして、成形回転軸70上に第１成形ノズル71から押し出される半溶融状態の軟質合成樹脂製帯状材10を螺旋巻きして軟質合成樹脂製管部1'を連続的に形成しながら、所望長さの軟質合成樹脂製管部1'の外周面に第２成形ノズル72から押し出される半溶融状態の硬質合成樹脂製帯状材条41を断面Ｕ字状に湾曲させてこの湾曲した硬質合成樹脂製突条41' を一定のピッチでもって螺旋巻きしてその両端フランジ部4a、4aを軟質合成樹脂製管部の外周面に融着させることにより硬質合成樹脂製螺旋突条４を設ける工程と、この工程に引き続いて上記軟質筒体部2'を形成する工程と、この軟質筒体部2'から再び軟質合成樹脂製管部1'における一定長さ部分の外周面に上記硬質合成樹脂製螺旋突条４を設ける工程と、この工程に引き続いて上記硬質筒体部3'を形成する工程とを繰り返し行いながら、成形回転軸70の先端側に送り出し、図11に示すように、該成形回転軸70の外側方に配設している冷却装置74から噴射される冷却水によって冷却して硬化させたのち、該成形回転軸70の先端側外周方に配設している回転切断刃75により該回転切断刃75の位置に達した上記軟質筒体部2'と上記硬質筒体部3'との長さ方向の中央部を順次切断することにより、外周面に硬質合成樹脂製中空螺旋突条４を螺旋巻きしている一定長さの軟質合成樹脂製管主体１の一端部に軟質継手部２を、他端部に硬質継手部３を一体に形成してなる合成樹脂製接続用管Ａを順次、連続的に製造するものである。 In this way, the semi-molten soft synthetic resin strip 10 extruded from the first molding nozzle 71 is spirally wound on the molding rotary shaft 70 to continuously form the soft synthetic resin pipe portion 1 'while maintaining the desired length. The soft synthetic resin tube portion 1 'is made of a curved hard synthetic resin by bending a semi-molten hard synthetic resin strip 41 extruded from the second molding nozzle 72 into a U-shaped cross section on the outer peripheral surface of the tube portion 1'. Providing the hard synthetic resin spiral ridge 4 by spirally winding the ridge 41 'at a constant pitch and fusing both end flange portions 4a, 4a to the outer peripheral surface of the soft synthetic resin pipe portion; Subsequent to this step, the step of forming the soft cylindrical portion 2 ′ and the hard synthetic resin spiral from the soft cylindrical portion 2 ′ to the outer peripheral surface of the fixed length portion of the soft synthetic resin pipe portion 1 ′ again. The step of providing the ridge 4 and the step of forming the rigid cylindrical body 3 'following this step 11, while being repeatedly performed, it is sent to the tip end side of the molding rotary shaft 70 and cooled by cooling water injected from a cooling device 74 arranged on the outer side of the molding rotary shaft 70 as shown in FIG. And the hard cylindrical body 2 ′ and the hard cylindrical body that have reached the position of the rotary cutting blade 75 by the rotary cutting blade 75 disposed on the outer peripheral side of the front end side of the molding rotary shaft 70. One end portion of a soft synthetic resin tube main body 1 having a certain length in which a hard synthetic resin hollow spiral ridge 4 is spirally wound around the outer peripheral surface by sequentially cutting the central portion in the length direction with the portion 3 ′ The synthetic resin connecting pipe A, which is formed by integrally forming the soft joint portion 2 and the hard joint portion 3 at the other end, is manufactured in sequence.

なお、第２成形ノズル72から押し出される硬質合成樹脂製帯状材41を断面Ｕ字状に湾曲成形する成形部材73としては、上記のような板材の上面に成形突条部73a を突設している構造のものに限らず、例えば、図12に示すように、外周面の中央部に全周に亘って一定高さの断面凸円弧状或いは梯形状等に形成されている成形突条部73a'を突設した成形ローラ73' を使用してもよい。 As the molding member 73 for bending the rigid synthetic resin strip 41 extruded from the second molding nozzle 72 into a U-shaped cross section, a molding protrusion 73a is provided on the upper surface of the plate material as described above. For example, as shown in FIG. 12, a molded ridge 73a formed in a convex arc shape or a trapezoidal shape with a constant height over the entire circumference at the center of the outer peripheral surface as shown in FIG. It is also possible to use a “forming roller 73 having a protrusion”.

本発明合成樹脂製接続用管の一部を省略した簡略縦断側面図。The simplified vertical side view which abbreviate | omitted a part of this invention synthetic resin connecting pipe. その簡略側面図。The simplified side view. 硬質合成樹脂製中空螺旋突条の別な形状を示す縦断側面図。The vertical side view which shows another shape of the hard spiral resin-made hollow spiral ridges. さらに別な形状を示す縦断側面図。The vertical side view which shows another shape. 硬質合成樹脂製螺旋突条を形成している状態の一部を断面した側面図。The side view which carried out the cross section of a part of the state which forms the hard synthetic resin spiral protrusion. その簡略正面図。The simplified front view. 軟質筒体部を形成している状態の一部を断面した側面図。The side view which carried out the cross section of a part of the state which forms the soft cylinder part. 再び硬質合成樹脂製螺旋突条を形成している状態の一部を断面した側面図。The side view which carried out the cross section of a part of the state which has formed the hard synthetic resin spiral protrusion again. 硬筒体部を形成している状態の一部を断面した側面図。The side view which carried out the cross section of a part of the state which forms the hard cylinder part. 硬質合成樹脂製螺旋突条を形成している状態の一部を断面した側面図。The side view which carried out the cross section of a part of the state which forms the hard synthetic resin spiral protrusion. 硬質筒体部を２分割している状態を示す側面図。The side view which shows the state which has divided the hard cylinder part into two. 成形部材の別な形状を示す斜視図。The perspective view which shows another shape of a shaping | molding member.

Ａ合成樹脂製接続用管
１軟質合成樹脂製管主体
1' 軟質合成樹脂製管部
２軟質継手部
2' 軟質筒体部
３硬質継手部
3' 硬質筒体部
４硬質合成樹脂製螺旋突条
10 軟質合成樹脂製帯状材
41 硬質合成樹脂製帯状材
70 成形回転軸
71 第１成形ノズル
72 第２成形ノズル
73 成形部材 A Synthetic resin connection pipe 1 Soft synthetic resin pipe
1 'Soft synthetic resin pipe part 2 Soft joint part
2 'Soft cylinder part 3 Hard joint part
3 'Hard cylinder part 4 Hard synthetic resin spiral ridge
10 Strip material made of soft synthetic resin
41 Hard plastic strip
70 Molding axis
71 First molding nozzle
72 Second molding nozzle
73 Molded parts

Claims

A soft synthetic resin spiral ridge having a U-shaped cross section is wound at a constant pitch around the outer peripheral surface excluding both ends of a soft synthetic resin pipe main body having a constant diameter, and both flange portions of the spiral ridge are softly synthesized. The resin pipe main body is integrally fused to the outer peripheral surface, and one end portion of the soft synthetic resin pipe main body is formed into a cylindrical soft joint portion made of a part of the soft synthetic resin pipe main body, In addition, a thin and narrow hard synthetic resin narrow strip continuous with the hard synthetic resin spiral ridge is spirally formed on the outer peripheral surface of the soft joint portion at the same pitch as the hard synthetic resin spiral ridge. The other end of the tube is made of the soft synthetic resin pipe, and the other end of the soft synthetic resin pipe is used as an inner layer. Rigid synthetic resin strips with flat protrusions that are flattened and deformed without gaps Synthetic resin connecting pipe, characterized by forming the rigid joint portion of the cylindrical shape formed by providing a hard synthetic resin layer of constant thickness by wrapped helically.

By coiling the soft synthetic resin-made belt material of the semi-molten state from the first molding nozzle on the molding rotating shaft extruding soft synthetic resin strip material in a semi-molten state, a soft synthetic resin pipe having a constant thickness The hard synthetic resin strip is extruded from the second molding nozzle, and the hard synthetic resin strip is formed and rotated at the center in the width direction of the hard synthetic resin strip. The hard synthetic resin belt-like material is curved in a U-shaped cross section by pressing the protrusion protruding from the center in the width direction of the molding member that is movably arranged in the vertical direction before reaching the shaft. While being molded, the hard synthetic resin protrusions having a U-shaped cross section are spirally wound around the outer peripheral surface of the soft synthetic resin pipe portion at a constant pitch, and both end flange portions are outer periphery of the soft synthetic resin pipe portion. Hard by fusing to the surface A step of providing a synthetic resin helical ridge, by a soft synthetic resin-made belt material of the semi-molten state be continuously spirally wound on the forming rotation axis, while forming a soft tubular body portion of predetermined length, While reducing the width and thickness of the rigid synthetic resin strip extruded from the second molding nozzle to form the rigid synthetic resin narrow strip, the rigid synthetic resin narrow strip is formed on the molding rotational axis. And the step of winding the soft cylindrical body continuously on the soft cylindrical portion with the same pitch as the hard synthetic resin ridge, and the semi-molten state hard again on the outer peripheral surface of the soft synthetic resin pipe portion. A process of providing a hard synthetic resin spiral ridge by spirally winding a synthetic resin spiral ridge and fusing both ends of the flange to the outer peripheral surface of the soft synthetic resin pipe section, followed by molding rotation Semi-molten soft synthetic tree on the shaft A strip of material is continuously spirally wound to form a soft synthetic resin tube portion of a certain length, and the hard synthetic resin protrusions in a semi-molten state are formed into a flat strip shape on the outer peripheral surface of the soft synthetic resin tube portion. The step of forming the hard cylindrical portion by spirally winding the hard synthetic resin band-shaped material formed in this manner, and sequentially cutting the central portion in the length direction of the soft cylindrical portion and the hard cylindrical portion By installing a cylindrical soft joint at one end of a soft synthetic resin tube main body with a hard synthetic resin spiral ridge wound around the outer peripheral surface and a cylindrical hard joint at the other end A method of manufacturing a synthetic resin connecting tube, characterized by manufacturing a tube made of