JPH0269219A - Method and apparatus for manufacturing synthetic resin corrugated tube having deep annular groove - Google Patents
Method and apparatus for manufacturing synthetic resin corrugated tube having deep annular grooveInfo
- Publication number
- JPH0269219A JPH0269219A JP22002188A JP22002188A JPH0269219A JP H0269219 A JPH0269219 A JP H0269219A JP 22002188 A JP22002188 A JP 22002188A JP 22002188 A JP22002188 A JP 22002188A JP H0269219 A JPH0269219 A JP H0269219A
- Authority
- JP
- Japan
- Prior art keywords
- corrugated tube
- synthetic resin
- mold
- corrugated
- pitch width
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 229920003002 synthetic resin Polymers 0.000 title claims abstract description 81
- 239000000057 synthetic resin Substances 0.000 title claims abstract description 81
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 28
- 238000000034 method Methods 0.000 title claims abstract description 20
- 229920005989 resin Polymers 0.000 claims abstract description 42
- 239000011347 resin Substances 0.000 claims abstract description 42
- 239000000203 mixture Substances 0.000 claims abstract description 24
- 229920000098 polyolefin Polymers 0.000 claims abstract description 13
- 229920001971 elastomer Polymers 0.000 claims abstract description 12
- 229920000915 polyvinyl chloride Polymers 0.000 claims abstract description 12
- 239000004800 polyvinyl chloride Substances 0.000 claims abstract description 12
- 238000010438 heat treatment Methods 0.000 claims description 32
- 238000000465 moulding Methods 0.000 claims description 26
- 230000002093 peripheral effect Effects 0.000 claims description 16
- 238000001816 cooling Methods 0.000 claims description 12
- 230000007423 decrease Effects 0.000 claims 1
- 238000001125 extrusion Methods 0.000 description 9
- 238000010586 diagram Methods 0.000 description 8
- 238000000071 blow moulding Methods 0.000 description 6
- 239000007788 liquid Substances 0.000 description 4
- 239000002351 wastewater Substances 0.000 description 3
- 239000004698 Polyethylene Substances 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- -1 polyethylene Polymers 0.000 description 2
- 229920000573 polyethylene Polymers 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 238000007666 vacuum forming Methods 0.000 description 2
- 230000008602 contraction Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 238000004065 wastewater treatment Methods 0.000 description 1
Landscapes
- Excavating Of Shafts Or Tunnels (AREA)
- Shaping Of Tube Ends By Bending Or Straightening (AREA)
Abstract
Description
[産業上の利用分野1
本発明は、ブロー成形装置又は真空成形装置により連続
的に金型によって成形される押出し機により平滑に押し
出された樹脂を金型内面に押し当て管外面を金型内面と
同一形状に成形する合成樹脂製波付管に係り、特に、製
造スピードを著しく高くすることができ、均一な内厚に
容易に成形することができ、かつ波形状の外周谷部にリ
ブ成形によって生じる圧縮残留応力によって耐疲労性を
向上することのできる環状の深溝を有する合成樹脂製波
付管の製造方法及びその装置に関する。[Industrial Application Field 1] The present invention is a blow molding device or a vacuum forming device that continuously molds a resin by pressing an extruder smoothly into the mold against the inner surface of the mold so that the outer surface of the tube becomes the inner surface of the mold. This relates to corrugated pipes made of synthetic resin that are molded into the same shape as the pipes.In particular, the production speed can be significantly increased, the inner thickness can be easily formed with uniformity, and ribs can be formed on the outer troughs of the corrugated shape. The present invention relates to a method and apparatus for manufacturing a synthetic resin corrugated pipe having annular deep grooves that can improve fatigue resistance due to compressive residual stress generated by the process.
【従来の技術]
近年、電線・ケーブルは、土中ケーブルのように架線電
柱を道路上より取り払い洞道内に布設する地中布設方式
が一般的に行なわれている。また、一方では、最近の建
設ブームに乗ってビルの建設が盛んになり、ビルとビル
の間隔が狭くなるにしたがい建設したビルに供給する電
力を引き込むためノミ線を架設する場所がなくなり土中
に埋め込むことが盛んに行なわれるようになってきた。
この電線・ケーブルの土中に埋設に当っては5波付き可
撓ポリエチレン管内に電線・ケーブルを収納し、この波
付き可撓ポリエチレン管ごと埋設する方法が一般に取ら
れている。
また、近距離、例えば、1つの工場内における液体の輸
送で、しかも連続的に液体を供給する必要がある場合に
は、管路を用いて輸送する手段が取られている。この管
路式の輸送手段における管路は、液体の輸送が直線的で
ない場合が多いため、可撓性のある蛇腹状の波付管が用
いられている。
この波付管は、廃水を汚水処理場へ輸送する場合とか、
汚水処理して法定基準に達した廃水を排水、1卓に1輸
送排水するようなものには、合成樹脂が使用されている
。
このように合成樹脂製波付管の用途は多岐に渡っている
。この合成樹脂製波付管は、一般に第9図に示す如くブ
ロー成形装置又は真空成形装置によって連続的に金型に
よって成形される。すなわち5ブロー成形装置又は真空
成形装置100は、内面に波型が形成されてブロック状
に構成されている金型110が多数連設されている。こ
の金型110は、複数個連ねられ隣接する金型は互いに
密に接触すると共に開動するように構成されており、複
数個の金型110がエンドレスのリング状に形成され金
型列120を構成している。この金型列120は、押出
し機200の樹脂押し出し部210近傍で直線状に所定
距離移動する成形部130が設けられている。また、こ
の金型列120は、複数条有しており、この複数条の金
型列120が成形部130で合わさり円筒状に形成され
る。
したがって、この成形部130において複数条の金型列
120によって形成される円筒状内に押出し機200か
ら高温に加熱溶融された樹脂300を押し出す。このよ
うに押出し機200から波付管の材料である樹脂300
を押出し、内部からガス圧を掛け、樹脂300を金型の
内面に押圧させて樹脂300と共に金型110を移動し
、この金型110を第9図図示矢印Aに示す如く移動す
る間に金型110によって保形しながら樹脂300を冷
却する。この押出し機200から押し出された樹脂30
0の押し出し速度に合わせて複数条の金型列120は、
直線状に所定距離移動して断面円形状の合成樹脂製波付
管400を製造する。この所定距離は、高温で押し出さ
れた樹脂300が保形する温度に冷却するまでの距離で
ある。この所定距離移動した複数条の金型列120の金
型11oは、小ブロックに分割され第9図図示矢印已に
示す如く放射線状に引き取られていく。コノようにして
、ブロー成形′J装置又は真空成形装置1゜Oにより連
続的に押出し41200により平滑に押し出された樹脂
300は金型110内面に押し当てられ、管外面は金型
110内面と同一形状に成形される。
【発明が解決しようとする課題)
このようにブロー成形装置又は真空成形装置によって金
型を用いて成形する方法にあっては、複数の金型を円筒
状に合わせこの複数の金型間に樹脂を連続的に押出し内
側からガス圧を掛けて平滑に押し出された樹脂を金型内
面に押し当てながら樹脂の押し出し速度に合わせて金型
を移動して成形するようになっている。したがって、波
ピッチ幅を小さくし溝の深さを大きくするには金型内面
の波形状の面の波ピッチ幅を小さくし溝の深さを大きく
することになるが、この金型内面の波ピッチ幅を小さく
、溝の深さを大きくするように変更すると、波付管の山
と山との間が狭くなるので、成形部130の金型110
による成形完了位置において、合成樹脂製波付管400
を構成する成形波付管から金型110が離れる際に、金
型110が回動するようにして成形波付管400がら離
れるため、金型110内側の突出部(合成樹脂製波付管
400の谷部成形リブ)14oによって、成形波付管4
00の谷部及び裾部にキズや凹みなどのキズ等を着けて
しまうため、金型に形成する波形のピッチ幅を小さく溝
の深さを大きくすることができず、ピッチ幅が小さく溝
深さの大きい合成樹脂製波付管が得られないという問題
点を有している。
また、金型110内面の波形に沿って押し当てられた押
出し機200により連続的に平滑に押し出される樹脂3
00は溶融状態であるため、内部よりガスを一定圧力で
封入しても波付管は、金型110の内面形状に沿って均
一な肉厚で波形に形成するのが困難で、特に波付管に深
い溝を設は肉厚を大きくする場合は著しく、肉厚が大き
いため冷却速度も低く製造速度が遅いという問題点を有
している。
本発明は、製造スピードを著しく高くすることができ、
均一な内厚に容易に成形することができ、かつ波形状の
外周谷部にリブ成形によって生じる圧縮残留応力によっ
て耐疲労性を向上することのできる環状の深溝を有する
合成樹脂製波付管の製造方法及びその装置を提供するこ
とを目的としている。
【課題を解決するための手段)
上記目的を達成するために、本発明の環状の深溝を有す
る合成樹脂製波付管の製造方法においては、ポリオレフ
ィン、ポリ塩化ビニル、ゴムのそれぞれの組成物又は混
合物のいずれかによって形成され波ピッチが太き(溝の
深さの浅い波付管を半溶融状態で成形し、しかる後所望
ピッチ幅の溝を成形するようにしたものである。
また、上記目的を達成するために1本発明の環状の深溝
を有する合成樹脂製波付管の製造装置においては、押出
し機により平滑円筒状に押し出されたポリオレフィン、
ポリ塩化ビニル、ゴムのそれぞれの組成物又は混合物の
いずれかの樹脂を金型成形部において該樹脂の外壁を金
型内面に押し当てて管外面を該金型内面と同一形状にし
て連続的に合成樹脂製波付管を成形するものにおいて、
上記金型成形部の成形波付管出口側に大きいピッチ幅か
ら徐々に小さいピッチ幅に変化しながら螺旋状に形成さ
れるリブが外周面に設けられている円筒と、該円筒を所
定速度で回転させる回転駆動手段とを備えた深溝成形装
置を上記金型成形部から搬出されてくる波付管の外周面
に前記リブを接触させて配置したものである。
また、上記目的を達成するために、本発明の環状の深溝
を有する合成樹脂製波付管の製造方法においては、ポリ
オレフィン、ポリ塩化ビニル、ゴムのそれぞれの組成物
又は混合物のいずれかによって波ピッチが大きく溝の深
さが浅く成形された波付管を半溶融状態に加熱し、しか
る後所望ピッチ幅の溝を成形するようにしたものである
。
さらに、上記目的を達成するために、本発明の環状の深
溝を有する合成樹脂製波付管の製造装置においでは、押
出し機により平滑円筒状に押し出されたポリオレフィン
、ポリ塩化ビニル、ゴムのそれぞれの組成物又は混合物
のいずれかによって形成される波付管を連続的に所定時
間加熱し、半溶融状態にせしめる加熱装置と、該加熱装
置の波付管出口側に大きいピッチ幅から徐々に小さいピ
、ノチ幅に変化しながら螺旋状に形成されるリブが外周
面に設けられている円筒と、該円筒を所定速度で回転さ
せる回転駆動手段とを備えた深溝成形装置を上記加熱装
置から搬出されてくる波付管の外周面に前記リブを接触
させて配置したものである。
さらにまた、上記目的を達成するために、本発明の環状
の深溝を有する合成樹脂製波付管の製造装置においては
、押出し機により平滑円筒状に押し出されたポリオレフ
ィン、ポリ塩化ビニル、ゴムのそれぞれの組成物又は混
合物のいずれかによって形成される波付管を連続的に所
定時間加熱して半溶融状態にせしめる加熱装置と、前記
筒状の波付管内の空気を吸出して減圧する減圧装置と、
前記加熱装置の波付管出口側から搬出されてくる波付管
を冷却する冷却装置とをソjaえたものである。
【作用)
樹脂によって形成され波ピッチが大きく溝の深さの浅い
波付管を金型で一旦半溶融状態で成形する。この半溶融
状態で波付に成形された波付管にさらに所望ピッチ幅の
溝を成形する。この波付管の成形は、押出し機により平
滑円筒状に押し出された樹脂を金型成形部において該樹
脂の外壁を金型内面に押し当てて管外面を該金型内面と
同一形状にして連続的に合成樹脂製波付管を成形する合
成樹脂製波付管の製造装置の金型成形部の成形波付管出
口側に大きいピッチ幅から徐々に小さいピッチ幅に変化
しながら螺旋状に形成されるリブが外周面に設けられて
いる円筒と、該円筒を所定速度で回転させる回転駆動手
段とを備えた深溝成形装置を上記金型成形部から搬出さ
れてくる波付管の外周面に前記リブを接触配置して行な
う。
また、樹脂によって波ピッチが大きく溝の深さが浅く成
形され完成された波付管を一旦半溶融状態に加熱する。
この−旦加熱して半溶融状態した波付管にさらに所望ピ
ッチ幅の溝を成形する。この波付管に成形する所望ピッ
チ幅の溝は、押出し機により平滑円筒状に押し出された
樹脂によって形成される波付管を連続的に所定時間加熱
し、半溶融状態にせしめる加熱装置と、該加熱装置の波
付管出口側に大きいピッチ幅から徐々に小さいピッチ幅
に変化しながら螺旋状に形成されるリブが外周面に設け
られている円筒と、該円筒を所定速度で回転させる回転
駆動手段とを備えた深溝成形装置を上記加熱装置から搬
出されてくる波付管の外周面に前記リブを接触配置させ
て形成する。あるいは、この波付管に成形する所望ピッ
チ幅の溝は、押出し機により平滑円筒状に押し出された
樹脂によって形成される波付管を連続的に所定時間加熱
して半溶融状態にせしめる加熱装置と、前記筒状の波付
管内の空気を吸出して減圧する減圧装置と、前記加熱装
置の波付管出口側から搬出されてくる波付管を冷却する
冷却装置とによって形成する。
〔実施例1
以下、本発明の実施例について説明する。
第1図〜第3図には、本発明に係る環状の深溝を有する
合成樹脂製波付管の製造方法及び装置の一実施例が示さ
れている。
図において、ブロー成形装置又は)!(空成形装置1は
、内面に波型が形成されてブロック状に構成されている
金型2が多数連設されている。この金型2の内面の波型
は、大きなピッチで浅い溝に形成されている。この金型
2は、複数調速ねられ隣接する金型は互いに密に接触す
ると共に開動するように構成されており、複数個の金型
2がエンドレスのリング状に形成され金型列3を構成し
ている。この金型列3は、押出し機の樹脂押し出し部近
傍で直線状に所定距雅移動する成形部4が設けられてい
る。また、この金型列3は、複数条有しており、この複
数条の金型列3が成形部4で合わさり円筒状に形成され
る。したがって、この成形部4において複数条の金型列
3によって形成される円筒状内に押出し機から高温に加
熱溶融された樹脂が円筒状に押し出される。このように
押出し機から波付管の材料である樹脂を円筒状に押し出
し、この円筒状の樹脂の内部にガス(空気)を吹き込み
、内部からガス圧を掛け、樹脂5を金型の内面に押圧さ
せて樹脂5と共に金型2を移動し、この金型2を第1図
図示実施Aに示す如く移動する間に金型2によって保形
しながら樹脂5を半溶融状態まで冷却する。この押出し
機から押し出された樹脂5の押し出し速度に合わせて複
数条の金型列3は、直線状に所定距離移動して断面円形
状の合成樹脂製波付管6を製造する。この所定距離は、
高温で押し出された樹脂5が半溶融状態で保形する温度
に冷却するまでの距離である。この所定距離移動した複
数条の金型列3の金型2は、小ブロックに分割され第1
図図示実施Bに示す如く放射線状に引き取られていく。
このようにして、連続的に押出し機により平滑に押し出
された樹脂5は金型2内面に押し当てられ、管外面は金
型2内面と同一形状の波ピッチが大きく、溝の浅い波形
に成形される。
この金型列3によって形成される成形部4の合成樹脂製
波付管6の出口近傍には、深溝成形装置7が設けられて
いる。この深溝成形装置7は、第2図に示す如く相対向
した位置に2つの円筒8.9を有している。この円筒8
,9は、ケーシング10に回転自在に軸支されている。
また、この円筒8にはリブ11が、円筒9にはリブ12
がそれぞれ設けられている。このリブ11は、大きいピ
ッチ幅から滑らかに小さいピッチ幅に成形部4から変化
しながら螺旋状に形成されている。また、このリブ12
は、リブ11同様大きいピッチ幅から滑らかに小さいピ
ッチ幅に成形部4から変化しながら螺旋状に形成されて
いる。このリブ1】0.12は、金型成形部4から搬出
されてくる合成樹脂製波付管6の外周面に接触配置され
ている。
また、この円筒8.9には、図示されていないが駆動装
置が取付けられており、この駆動装置によって円筒8,
9は回転するように構成されている。この駆動装置によ
る円筒8.9の回転によってリブ11.12は回転する
。また、この駆動装置による円筒8,9の回転は、押出
し機から押し出される高温に加熱溶融された樹脂の押し
出し速度に同調して行なわれ、円筒8.9は同期を取っ
て回転させるようになっている。このようにリブ11.
12を回転させることによって半溶融状態で金型成形部
4から搬送されてきた金型2内面と同一形状の波ピッチ
が大きく、溝の浅い波形に成形された合成樹脂製波付管
6の波ピッチをリブ11.12のピッチ幅に収縮合致さ
せて成形する。
その後図示されていないが冷却装置によって冷却して深
い溝の合成樹脂製波付管を得る。
なお、第3図に示す如く、ケーシング10に円筒13.
14.15のそれぞれに設けられるリブ16.17.1
8と3つのリブを回転自在に軸支しても良い。
第4図には、本発明に係る環状の深溝を有する合成樹脂
製波付管の製造方法及び装置の他の実施例が示されてい
る。本実施例が第1図図示実施例と異なる点は、第1図
図示実施例が合成樹脂製波付管を得るのに合成樹脂製波
付管の外周面にケーシングに回転自在に軸支されるリブ
を接触配置し、このリブを回転駆動装置によって回転せ
ているのに対し、本実施例がケーシングに回転自在に軸
支されるリブを合成樹脂製波付管の外周面に接触配置し
、ケーシングを回転駆動装置によって回転せるようにし
た点である。他は、第1図図示実施例と同様である。
すなわち、図において、金型列3によって形成される成
形部4の合成樹脂製波付管6の出口近傍には、深溝成形
装置19が設けられている。この深溝成形装置19は、
相対向した位置に2つの円筒20.21を有している。
この円筒20.21は、ケーシング22に回転自在に軸
支されている。
また、この円筒20にはリブ23が、円筒21にはリブ
24がそれぞれ設けられている。このリブ23.24は
、共に大きいピッチ幅から滑らかに小さいピッチ幅に成
形部4から変化しながら螺旋状に形成されている。この
リブ23.24は、金型成形部4から搬出されてくる合
成樹脂製波付管6の外周面に接触配置されている。
また、このケーシング22には、図示されていないが駆
動装置が取付けられており、この駆動装置によってケー
シング22は合成樹脂製波付管6の中心軸を中心に回転
するように構成されている。
この駆動装置によるケーシング22の回転によってリブ
23.24は回転する。また、この駆動装置によるケー
シング22の回転は、押出し機から押し出される高温に
加熱溶融された樹脂の押し出し速度に同調して行なわれ
る。このようにケーシング22を回転させることによっ
てリブ23,24を回転させ、半溶融状態で金型成形部
4から搬送されてきた金型2内面と同一形状に成形され
た波ピッチが大きく、溝の浅い波形に成形された合成樹
脂製波付管6の波ピッチをリブ23.24のピッチ幅に
収縮合致させて成形する。その後図示されていないが冷
却装置によって冷却して深い溝の合成樹脂製波付管を得
る。
第5図〜第6図には、本発明に係る環状の深溝を有する
合成樹脂製波付管の製造方法及び装置の他の実施例が示
されている。
図において波付管として成形された合成樹脂製波付管2
5は、ドラム26に巻かれている。このドラム26に巻
かれた合成樹脂製波付管25は、ドラム26が第5図図
示矢印Aに示す如き方向に回転して定量的に供給される
。この合成樹脂製波付管25に用いられる合成樹脂には
、ポリオレフィン、ポリ塩化ビニル、ゴムのそれぞれの
組成物又は混合物のいずれかが用いられている。このド
ラム26の合成樹脂製波付管25供給方向前方には、ヒ
ータ等の加熱装置27が設けられている。
この加熱装置27は、ドラム26から供給されてくる合
成樹脂製波付管25を半溶融状態に加熱するもので、こ
の加熱装置27によって合成樹脂製波付管25は半溶融
状態に溶融する。この加熱装置27の合成樹脂製波付管
25流れ方向前方には。
深溝成形装置28が設けられている。この深溝成形装置
28は、第6図に示す如き構成を有している。この深溝
成形装置28は第1図図示深溝成形装置7と同一である
。すなわち、この深溝成形装置28は、相対向した位置
に2つの円筒29.30を有し、この円筒29.30は
、ケーシング31に回転自在に軸支されている。この円
筒29.3oにはそれぞれリブ32.33が設けられて
おり、このリブ32.33は、それぞれ大きいピッチ幅
から滑らかに小さいピッチ幅に合成樹脂製波付管25流
れ方向前方に向かって変化しながら螺旋状に形成されて
いる。このリブ32.33は、加熱装置27から搬出さ
れてくる合成樹脂製波付管25の外周面に接触配置され
ている。
また、この円筒29.30には、図示されていないが駆
動装置が取付けられており、この駆動装置によって円筒
29.30は回転するように構成されている。この駆動
装置による円筒29.30の回転によってリブ32.3
3は回転する。また、この駆動装置による円筒29.3
0の回転は、押出し機から押し出される高温に加熱溶融
された樹脂の押し出し速度に同調して行なわれ、円筒2
9.30は同期を取って回転させるようになっている。
このようにリブ32.33を回転させることによって半
溶融状態で加熱装置27から搬送されてきた合成樹脂製
波付管25の波ピンチをリブ32.33のピッチ幅に収
縮合致させて成形する。その後、合成樹脂製波付管25
流れ方向前方に設けられた冷却装置34によって冷却し
て深い溝の合成樹脂製波付管35を得る。この冷却装置
34によって冷却した後、引取機36によって引き取り
、ドラム37に第5図図示矢印Bに示す方向に回転して
巻き取る。
第7図〜第8図には、本発明に係る環状の深溝を有する
合成樹脂製波付管の製造方法及び装置の別な実施例が示
されている。
図において波付管として成形された合成樹脂製波付管3
8は、供給ドラム39に巻かれている。
この供給ドラム39に巻かれた合成樹脂製波付管38は
、供給ドラム39が第7図図示矢印Aに示す如き方向に
回転して定量的に供給される。この合成樹脂製波付管3
8に用いられる合成樹脂には、ポリオレフィン、ポリ塩
化ビニル、ゴムのそれぞれの組成物又は混合物のいずれ
かが用いられている。この供給ドラム39の合成樹脂製
波付管38供給方向前方には、ヒータ等の加熱装置40
が設けられている。この加熱装置40は、供給ドラム3
9から供給されてくる合成樹脂製波付管38を半溶融状
態に加熱するもので、この加熱装置40によって合成樹
脂製波付管38は半溶融状態になる。
一方供給ドラム39には、減圧装置41が設けられてい
る。この減圧装置41は、供給ドラム39に巻かれてい
る合成樹脂製波付管38の端末に接続されており、筒状
になっている合成樹脂製波付管38内の空気を抜いて減
圧するものである。
すなわち、いま、波付管として成形された合成樹脂製波
付管38を加熱装@40において半溶融状態にし、減圧
装置41で合成樹脂製波付管38内の空気を抜いて大気
圧以下に減圧すると、合成樹脂製波付管38は、長手方
向への収縮力を受けて第8図に示す如く収縮し、合成樹
脂製波付管38の波ピッチは小さくなり、溝は深くなる
。このようにして波ピッチの小さい溝の深い合成樹脂製
波付管42を得る。
また、この加熱装置40の合成樹脂製波付管42の流れ
方向前方には、冷却装置43が設けられている。この冷
却装置43によって合成樹脂製波付管42は冷却され深
い溝の合成樹脂製波付管を得る。この冷却装置43によ
って冷却した後、引取機44によって引き取り、巻き取
りドラム45に第7図図示矢印Bに示す方向に回転して
巻き取る。
【発明の効果1
本発明は、以上説明したように構成されているので、以
下に記載されるような効果を奏する。
樹脂によって形成され波ピッチが大きく溝の深さの浅い
波付管を半溶融状態で成形し、しかる後所望ピッチ幅の
溝を成形するため、製造スピードを著しく高くすること
ができ、均一な内厚に容易に成形することができ、かつ
波形状の外周谷部にリブ成形によって生じる圧縮残留応
力によって耐疲労性を向上することができる。
また、金型内面と同一形状にして連続的に合成樹脂製波
付管を成形するに、金型成形部の成形波付管出口側に大
きいピッチ幅から徐々に小さいピッチ幅に変化しながら
螺旋状に形成されるリブが外周面に設けられている円筒
と、該円筒を所定速度で回転させる回転駆動手段とを備
えた深溝成形装置を前記金型成形部から搬出されてくる
波付管の外周面に前記リブを接触させて配置してリブに
よって深溝を形成するため、製造スピードを著しく高く
することができ、均一な内厚に成形することができ、か
つ波形状の外周谷部にリブ成形によって生じる圧縮残留
応力によって耐疲労性を向上することができる。
また、樹脂によって波ピッチが大きく溝の深さが浅く成
形された波付管を半溶融状態に加熱し、しかる後所望ピ
ッチ幅の溝を成形するため、既に合成樹脂製波付管とし
て製造されたものであっても所望のピッチ幅の溝に成形
し直すことができる。
さらに、押出し機により平滑円筒状に押し出された樹脂
によって形成される波付管を連続的に半溶融状態に加熱
する加熱装置と、該加熱装置の波付管出口側に大きいピ
ッチ幅から徐々に小さいピッチ幅に変化しながら螺旋状
に形成されるリブが外周面に設けられている円筒と、該
円筒を所定速度で回転させる回転駆動手段とを備えた深
溝成形装置を上記加熱装置から搬出されてくる波付管の
外周面に前記リブを接触させて配置して構成されるため
、既に合成樹脂製波付管として製造されたものであって
も、効率良く均一な内厚に成形することができ、かつ波
形状の外周谷部にリブ成形によって生じる圧縮残留応力
によって耐疲労性を向上することができる。
またさらに、押出し機により平滑円筒状に押し出された
樹脂によって形成される波゛付管を連続的に半、溶融状
態に加熱する加熱装置と、前記筒状の波付管内の空気を
吸出して減圧する減圧装置と、前記加熱装置の波付管出
口側から搬出されてくる波付管を冷却する冷却装置とを
備えたため、既に合成樹脂製波付管として製造されたも
のであっても、効率良く均一な内厚に成形することがで
きる。[Prior Art] In recent years, electric wires and cables have generally been installed underground, in which overhead power poles are removed from the road and installed in tunnels, similar to underground cables. On the other hand, with the recent construction boom, the construction of buildings has become more active, and as the distance between buildings has narrowed, there is no longer a place to erect chisel wires to draw in the electricity that will be supplied to the constructed buildings. It has become common practice to embed it in When burying these electric wires/cables in the soil, a method generally used is to store the electric wires/cables in a five-corrugated flexible polyethylene pipe and bury the entire corrugated flexible polyethylene pipe. Furthermore, when transporting liquid over a short distance, for example within one factory, and when it is necessary to continuously supply the liquid, a method of transporting the liquid using a pipe is taken. In the pipes of this pipe-type transportation means, flexible corrugated corrugated pipes are used because the transport of liquid is often not linear. This corrugated pipe is used when transporting wastewater to a sewage treatment plant, etc.
Synthetic resins are used for wastewater treatment and drainage of wastewater that meets legal standards, and for transporting and discharging wastewater per table. As described above, synthetic resin corrugated pipes have a wide variety of uses. This synthetic resin corrugated tube is generally continuously molded using a mold using a blow molding device or a vacuum molding device as shown in FIG. That is, the 5-blow molding device or the vacuum molding device 100 includes a large number of molds 110 that are arranged in a block shape and have corrugations formed on the inner surface. The molds 110 are configured such that a plurality of molds are connected and adjacent molds are in close contact with each other and open and move, and a plurality of molds 110 are formed in an endless ring shape to form a mold row 120. are doing. This mold row 120 is provided with a molding section 130 that moves linearly a predetermined distance near the resin extrusion section 210 of the extruder 200. The mold row 120 has a plurality of mold rows, and the mold rows 120 of the plurality of mold rows are joined together at the molding part 130 to form a cylindrical shape. Therefore, in the molding section 130, the resin 300 heated and melted at a high temperature is extruded from the extruder 200 into a cylindrical shape formed by the plurality of mold rows 120. In this way, from the extruder 200, the resin 300, which is the material of the corrugated tube, is
The resin 300 is pressed against the inner surface of the mold by applying gas pressure from inside, and the mold 110 is moved together with the resin 300. While the mold 110 is moved as shown by arrow A in FIG. The resin 300 is cooled while being held in shape by the mold 110. Resin 30 extruded from this extruder 200
A plurality of mold rows 120 are formed according to the extrusion speed of 0.
A synthetic resin corrugated tube 400 having a circular cross section is manufactured by moving a predetermined distance in a straight line. This predetermined distance is the distance until the resin 300 extruded at high temperature is cooled to a temperature at which it retains its shape. The molds 11o of the plurality of mold rows 120 that have been moved a predetermined distance are divided into small blocks and are taken out in a radial manner as shown by the arrows in FIG. In this way, the resin 300 that has been smoothly extruded by the extrusion 41200 continuously by the blow molding 'J device or the vacuum forming device 1°O is pressed against the inner surface of the mold 110, and the outer surface of the tube is the same as the inner surface of the mold 110. molded into a shape. Problems to be Solved by the Invention) In this method of molding using a mold using a blow molding device or a vacuum molding device, a plurality of molds are arranged in a cylindrical shape, and resin is placed between the plurality of molds. The resin is continuously extruded and gas pressure is applied from the inside to press the extruded resin smoothly against the inner surface of the mold, while the mold is moved in accordance with the extrusion speed of the resin. Therefore, in order to reduce the wave pitch width and increase the groove depth, the wave pitch width of the wavy surface on the inner surface of the mold must be reduced and the groove depth should be increased. If the pitch width is decreased and the groove depth is increased, the distance between the crests of the corrugated tube becomes narrower, so the mold 110 of the molding section 130
At the molding completed position, the synthetic resin corrugated tube 400
When the mold 110 separates from the molded corrugated tube 400 that constitutes the molded corrugated tube 400, the mold 110 rotates and separates from the molded corrugated tube 400. The molded corrugated pipe 4 is formed by the trough molded rib) 14o.
Since the grooves and hems of the 00 will have scratches, dents, etc., the pitch width of the waveform formed on the mold cannot be made small and the depth of the groove cannot be increased, and the pitch width is small and the groove depth is This method has a problem in that it is not possible to obtain a synthetic resin corrugated tube with a large thickness. Further, the resin 3 is continuously and smoothly extruded by the extruder 200 that is pressed along the corrugation of the inner surface of the mold 110.
Since 00 is in a molten state, it is difficult to form a corrugated tube with a uniform wall thickness and a corrugated shape along the inner surface shape of the mold 110 even if gas is sealed from inside at a constant pressure. Providing deep grooves in the tube is particularly problematic when increasing the wall thickness, and because the wall thickness is large, the cooling rate is low and the manufacturing speed is slow. The present invention can significantly increase manufacturing speed,
A synthetic resin corrugated tube with annular deep grooves that can be easily formed to a uniform inner thickness and improve fatigue resistance due to the compressive residual stress generated by rib forming in the corrugated outer peripheral valley. The purpose of this invention is to provide a manufacturing method and an apparatus for the same. [Means for Solving the Problems] In order to achieve the above object, in the method for manufacturing a synthetic resin corrugated pipe having an annular deep groove of the present invention, polyolefin, polyvinyl chloride, rubber compositions or A corrugated tube formed by one of the mixtures and having a thick corrugated pitch (shallow groove depth) is formed in a semi-molten state, and then grooves of the desired pitch width are formed. In order to achieve the object, the apparatus for manufacturing a synthetic resin corrugated pipe having an annular deep groove according to the present invention uses a polyolefin extruded into a smooth cylindrical shape by an extruder;
The outer wall of the resin is pressed against the inner surface of the mold in the mold molding section to continuously make the outer surface of the tube the same shape as the inner surface of the mold. For molding synthetic resin corrugated pipes,
A cylinder whose outer peripheral surface is provided with ribs formed in a spiral shape while changing from a large pitch width to a gradually smaller pitch width on the exit side of the molded corrugated tube of the mold forming part, and the cylinder is rotated at a predetermined speed. A deep groove forming device equipped with a rotary drive means for rotating the deep groove forming device is arranged so that the ribs are in contact with the outer circumferential surface of the corrugated tube carried out from the mold forming section. In addition, in order to achieve the above object, in the method for manufacturing a synthetic resin corrugated pipe having an annular deep groove of the present invention, the corrugation pitch is increased by using a composition or a mixture of each of polyolefin, polyvinyl chloride, and rubber. A corrugated pipe formed with a large pitch and a shallow groove depth is heated to a semi-molten state, and then grooves with a desired pitch width are formed. Furthermore, in order to achieve the above object, in the apparatus for manufacturing a synthetic resin corrugated pipe having an annular deep groove of the present invention, each of polyolefin, polyvinyl chloride, and rubber extruded into a smooth cylindrical shape by an extruder is used. A heating device that continuously heats a corrugated tube formed by either a composition or a mixture for a predetermined period of time to bring it into a semi-molten state; , a deep groove forming device comprising a cylinder provided with a rib formed in a spiral shape while changing the notch width on the outer peripheral surface, and a rotational drive means for rotating the cylinder at a predetermined speed is carried out from the heating device. The ribs are placed in contact with the outer peripheral surface of the corrugated tube. Furthermore, in order to achieve the above object, in the apparatus for manufacturing a synthetic resin corrugated pipe having an annular deep groove of the present invention, each of polyolefin, polyvinyl chloride, and rubber extruded into a smooth cylindrical shape by an extruder is used. a heating device that continuously heats a corrugated tube formed by any of the composition or mixture for a predetermined period of time to bring it into a semi-molten state; and a pressure reducing device that sucks out the air in the cylindrical corrugated tube to reduce the pressure. ,
It is equipped with a cooling device for cooling the corrugated tube carried out from the corrugated tube exit side of the heating device. [Operation] A corrugated tube made of resin with a large corrugation pitch and shallow groove depth is once molded in a semi-molten state using a mold. Grooves with a desired pitch width are further formed on the corrugated tube formed into a corrugated shape in this semi-molten state. This corrugated tube is formed by extruding the resin into a smooth cylindrical shape using an extruder and pressing the outer wall of the resin against the inner surface of the mold in the mold forming section, making the outer surface of the tube the same shape as the inner surface of the mold and making it continuous. Formed in a spiral shape while gradually changing from a large pitch width to a smaller pitch width on the exit side of the molded corrugated tube in the mold forming section of a synthetic resin corrugated tube manufacturing equipment that molds synthetic resin corrugated tubes. A deep groove forming device equipped with a cylinder having ribs provided on the outer circumferential surface and a rotational drive means for rotating the cylinder at a predetermined speed is applied to the outer circumferential surface of the corrugated tube carried out from the mold forming section. This is done by placing the ribs in contact with each other. In addition, the completed corrugated tube, which is molded with resin to have a large corrugation pitch and shallow groove depth, is once heated to a semi-molten state. Grooves with a desired pitch width are further formed on the corrugated tube, which has been heated to a semi-molten state. Grooves with a desired pitch width to be formed on the corrugated tube include: a heating device that continuously heats the corrugated tube formed of resin extruded into a smooth cylindrical shape by an extruder for a predetermined period of time to bring it into a semi-molten state; A cylinder whose outer circumferential surface is provided with ribs formed in a spiral shape while gradually changing from a large pitch width to a small pitch width on the corrugated tube outlet side of the heating device, and a rotation for rotating the cylinder at a predetermined speed. A deep groove forming device including a driving means is formed by placing the ribs in contact with the outer circumferential surface of the corrugated tube carried out from the heating device. Alternatively, the grooves of the desired pitch width to be formed on the corrugated tube can be formed by a heating device that continuously heats the corrugated tube formed of resin extruded into a smooth cylindrical shape by an extruder for a predetermined period of time to bring it into a semi-molten state. , a pressure reducing device that sucks out the air in the cylindrical corrugated tube to reduce the pressure, and a cooling device that cools the corrugated tube carried out from the corrugated tube exit side of the heating device. [Example 1 Examples of the present invention will be described below. 1 to 3 show an embodiment of the method and apparatus for manufacturing a synthetic resin corrugated pipe having an annular deep groove according to the present invention. In the figure, blow molding equipment or )! (The air forming device 1 has a large number of molds 2 each having a block-like configuration with corrugations formed on the inner surface. The corrugations on the inner surface of the molds 2 are formed into shallow grooves at a large pitch. The molds 2 are configured such that a plurality of molds are controlled so that adjacent molds are in close contact with each other and open and move, and the plurality of molds 2 are formed in an endless ring shape. This mold row 3 is provided with a molding section 4 that moves a predetermined distance in a straight line near the resin extrusion section of the extruder. , has a plurality of mold rows 3, and these mold rows 3 are combined in the molding section 4 to form a cylindrical shape. The resin heated and melted at high temperature is extruded from the extruder into a cylindrical shape.In this way, the extruder extrudes the resin, which is the material of the corrugated tube, into a cylindrical shape, and gas (air) is inside the cylindrical resin. is blown into the mold, gas pressure is applied from inside, the resin 5 is pressed against the inner surface of the mold, and the mold 2 is moved together with the resin 5. While the mold 2 is moved as shown in FIG. The resin 5 is cooled to a semi-molten state while being held in shape by the mold 2.The mold rows 3, which are made of multiple molds, are moved linearly for a predetermined distance according to the extrusion speed of the resin 5 extruded from the extruder to form a cross-sectional shape. A circular synthetic resin corrugated tube 6 is manufactured.This predetermined distance is
This is the distance until the resin 5 extruded at high temperature is cooled to a temperature at which it retains its shape in a semi-molten state. The molds 2 of the plurality of mold rows 3 that have been moved a predetermined distance are divided into small blocks and the first
As shown in the illustrated embodiment B, it is taken up in a radial manner. In this way, the resin 5 continuously and smoothly extruded by the extruder is pressed against the inner surface of the mold 2, and the outer surface of the tube is formed into a corrugated shape with a large wave pitch and shallow grooves, the same shape as the inner surface of the mold 2. be done. A deep groove molding device 7 is provided near the exit of the synthetic resin corrugated tube 6 of the molding section 4 formed by the mold row 3. This deep groove forming device 7 has two cylinders 8.9 located at opposite positions, as shown in FIG. This cylinder 8
, 9 are rotatably supported by the casing 10. Further, this cylinder 8 has a rib 11, and the cylinder 9 has a rib 12.
are provided for each. The ribs 11 are formed in a spiral shape while smoothly changing from a large pitch width to a small pitch width from the molded part 4. Also, this rib 12
, like the ribs 11, are formed in a spiral shape while smoothly changing from a large pitch width to a small pitch width from the molded part 4. This rib 1]0.12 is placed in contact with the outer circumferential surface of the synthetic resin corrugated tube 6 carried out from the molding section 4. Further, a driving device (not shown) is attached to this cylinder 8.9, and this driving device causes the cylinder 8,
9 is configured to rotate. The rotation of the cylinder 8.9 by this drive causes the rib 11.12 to rotate. Further, the rotation of the cylinders 8 and 9 by this drive device is performed in synchronization with the extrusion speed of the resin heated and melted at a high temperature extruded from the extruder, and the cylinders 8 and 9 are rotated in synchronization. ing. In this way, rib 11.
The waves of the synthetic resin corrugated tube 6 are conveyed in a semi-molten state from the mold molding section 4 by rotating the pipe 12, and are molded into corrugations with a large wave pitch and shallow grooves, the same shape as the inner surface of the mold 2. The pitch is shrink-matched to the pitch width of the ribs 11, 12 and molded. Thereafter, it is cooled by a cooling device (not shown) to obtain a corrugated synthetic resin tube with deep grooves. Incidentally, as shown in FIG. 3, the casing 10 has a cylinder 13.
Ribs 16.17.1 provided on each of 14.15
8 and three ribs may be rotatably supported. FIG. 4 shows another embodiment of the method and apparatus for manufacturing a synthetic resin corrugated tube having an annular deep groove according to the present invention. This embodiment differs from the embodiment shown in Figure 1 in that the embodiment shown in Figure 1 obtains a synthetic resin corrugated tube, but the outer peripheral surface of the synthetic resin corrugated tube is rotatably supported by a casing. In contrast, in this embodiment, the ribs rotatably supported by the casing are arranged in contact with the outer peripheral surface of the synthetic resin corrugated pipe, and the ribs are rotated by a rotary drive device. , the casing can be rotated by a rotary drive device. The rest is the same as the embodiment shown in FIG. That is, in the figure, a deep groove molding device 19 is provided near the outlet of the synthetic resin corrugated tube 6 of the molding section 4 formed by the mold row 3. This deep groove forming device 19 is
It has two cylinders 20, 21 at opposite positions. This cylinder 20.21 is rotatably supported by the casing 22. Further, the cylinder 20 is provided with a rib 23, and the cylinder 21 is provided with a rib 24, respectively. The ribs 23 and 24 are both formed in a spiral shape, changing smoothly from a large pitch width to a small pitch width from the molded portion 4. The ribs 23 and 24 are placed in contact with the outer circumferential surface of the synthetic resin corrugated tube 6 that is carried out from the molding section 4. Further, a drive device (not shown) is attached to the casing 22, and the casing 22 is configured to rotate around the central axis of the corrugated synthetic resin tube 6 by this drive device. Rotation of the casing 22 by this drive causes the ribs 23,24 to rotate. Further, the rotation of the casing 22 by this drive device is performed in synchronization with the extrusion speed of the resin heated and melted at a high temperature and extruded from the extruder. By rotating the casing 22 in this way, the ribs 23 and 24 are rotated, and the wave pitch formed in the same shape as the inner surface of the mold 2, which is conveyed from the mold forming section 4 in a semi-molten state, is large and the grooves are formed. The corrugated pipe 6 made of synthetic resin, which is formed into a shallow corrugation, is molded by shrinking the corrugation pitch to match the pitch width of the ribs 23 and 24. Thereafter, it is cooled by a cooling device (not shown) to obtain a corrugated synthetic resin tube with deep grooves. 5 and 6 show another embodiment of the method and apparatus for manufacturing a synthetic resin corrugated pipe having an annular deep groove according to the present invention. In the figure, synthetic resin corrugated tube 2 molded as a corrugated tube
5 is wound around a drum 26. The synthetic resin corrugated tube 25 wound around the drum 26 is supplied quantitatively as the drum 26 rotates in the direction indicated by arrow A in FIG. The synthetic resin used for this synthetic resin corrugated tube 25 is either a composition or a mixture of polyolefin, polyvinyl chloride, and rubber. A heating device 27 such as a heater is provided in front of the drum 26 in the direction in which the synthetic resin corrugated tube 25 is supplied. This heating device 27 heats the synthetic resin corrugated tube 25 supplied from the drum 26 to a semi-molten state, and the synthetic resin corrugated tube 25 is melted to a semi-molten state by this heating device 27. The synthetic resin corrugated tube 25 of this heating device 27 is located in front of it in the flow direction. A deep groove forming device 28 is provided. This deep groove forming device 28 has a configuration as shown in FIG. This deep groove forming device 28 is the same as the deep groove forming device 7 shown in FIG. That is, this deep groove forming device 28 has two cylinders 29.30 at opposing positions, and the cylinders 29.30 are rotatably supported by the casing 31. Each of the cylinders 29.3o is provided with a rib 32.33, and each rib 32.33 changes smoothly from a large pitch width to a small pitch width toward the front of the synthetic resin corrugated tube 25 in the flow direction. It is formed in a spiral shape. The ribs 32 and 33 are placed in contact with the outer peripheral surface of the synthetic resin corrugated tube 25 being carried out from the heating device 27. Furthermore, a driving device (not shown) is attached to this cylinder 29.30, and the cylinder 29.30 is configured to rotate by this driving device. Due to the rotation of the cylinder 29.30 by this drive, the rib 32.3 is
3 rotates. Also, the cylinder 29.3 by this drive device
The rotation of the cylinder 2 is performed in synchronization with the extrusion speed of the resin heated and melted at a high temperature extruded from the extruder.
9.30 is designed to rotate in synchronization. By rotating the ribs 32, 33 in this manner, the corrugated pinch of the synthetic resin corrugated tube 25, which has been conveyed from the heating device 27 in a semi-molten state, is contracted to match the pitch width of the ribs 32, 33, and is molded. After that, the synthetic resin corrugated tube 25
It is cooled by a cooling device 34 provided at the front in the flow direction to obtain a corrugated synthetic resin tube 35 with deep grooves. After being cooled by this cooling device 34, it is taken up by a take-up machine 36, and wound onto a drum 37 by rotating in the direction shown by arrow B in FIG. 7 and 8 show another embodiment of the method and apparatus for manufacturing a synthetic resin corrugated pipe having an annular deep groove according to the present invention. In the figure, synthetic resin corrugated tube 3 molded as a corrugated tube
8 is wound around the supply drum 39. The synthetic resin corrugated tube 38 wound around the supply drum 39 is supplied quantitatively as the supply drum 39 rotates in the direction shown by arrow A in FIG. This synthetic resin corrugated tube 3
The synthetic resin used in No. 8 is either a composition or a mixture of polyolefin, polyvinyl chloride, and rubber. A heating device 40 such as a heater is provided in front of the synthetic resin corrugated pipe 38 of the supply drum 39 in the supply direction.
is provided. This heating device 40
The synthetic resin corrugated tube 38 supplied from 9 is heated to a semi-molten state, and this heating device 40 brings the synthetic resin corrugated tube 38 into a semi-molten state. On the other hand, the supply drum 39 is provided with a pressure reducing device 41 . This pressure reducing device 41 is connected to the end of the synthetic resin corrugated tube 38 wound around the supply drum 39, and removes air from the cylindrical synthetic resin corrugated tube 38 to reduce the pressure. It is something. That is, the synthetic resin corrugated tube 38 that has been molded as a corrugated tube is brought into a semi-molten state in the heating device @ 40, and the air inside the synthetic resin corrugated tube 38 is removed by the pressure reducing device 41 to reduce the pressure to below atmospheric pressure. When the pressure is reduced, the synthetic resin corrugated tube 38 receives a contraction force in the longitudinal direction and contracts as shown in FIG. 8, the wave pitch of the synthetic resin corrugated tube 38 becomes smaller and the groove becomes deeper. In this way, a synthetic resin corrugated tube 42 having deep grooves with a small corrugation pitch is obtained. Further, a cooling device 43 is provided in front of the synthetic resin corrugated tube 42 of the heating device 40 in the flow direction. The synthetic resin corrugated tube 42 is cooled by this cooling device 43 to obtain a synthetic resin corrugated tube with deep grooves. After being cooled by this cooling device 43, it is taken up by a take-up machine 44, and wound onto a take-up drum 45 by rotation in the direction shown by arrow B in FIG. Effects of the Invention 1 Since the present invention is configured as described above, it produces effects as described below. A corrugated pipe made of resin with a large corrugation pitch and shallow groove depth is molded in a semi-molten state, and then grooves with the desired pitch width are molded, making it possible to significantly increase production speed and achieve uniform internal grooves. It can be easily formed to a large thickness, and fatigue resistance can be improved due to compressive residual stress generated by rib forming in the wavy outer peripheral valley. In addition, in order to continuously mold synthetic resin corrugated tubes in the same shape as the inner surface of the mold, it is necessary to create a spiral pattern on the exit side of the corrugated tube in the molding section while changing from a large pitch width to a gradually smaller pitch width. A deep groove forming device equipped with a cylinder having ribs formed on the outer peripheral surface thereof and a rotational drive means for rotating the cylinder at a predetermined speed is used to process the corrugated tube carried out from the mold forming section. Since the ribs are placed in contact with the outer peripheral surface to form deep grooves, the manufacturing speed can be significantly increased, the inner thickness can be uniform, and the ribs can be formed in the wavy outer peripheral valleys. Fatigue resistance can be improved by compressive residual stress generated by forming. In addition, corrugated tubes formed with resin with a large corrugation pitch and shallow groove depth are heated to a semi-molten state, and then grooves with the desired pitch width are formed. Even if the groove is small, it can be reshaped into a groove with a desired pitch width. Furthermore, a heating device that continuously heats the corrugated tube formed by the resin extruded into a smooth cylindrical shape by an extruder to a semi-molten state, and a heating device that gradually heats the corrugated tube from a large pitch width to the outlet side of the corrugated tube of the heating device. A deep groove forming device comprising a cylinder having ribs formed in a spiral shape while changing the pitch width on the outer peripheral surface thereof, and a rotational drive means for rotating the cylinder at a predetermined speed is carried out from the heating device. Since the ribs are placed in contact with the outer circumferential surface of the corrugated pipe, even if the pipe is already manufactured as a synthetic resin corrugated pipe, it can be efficiently molded to a uniform inner thickness. The fatigue resistance can be improved by the compressive residual stress generated by rib forming in the wavy outer peripheral valley. Furthermore, a heating device that continuously heats a corrugated tube formed of resin extruded into a smooth cylindrical shape by an extruder to a semi-molten state, and a device that sucks out the air inside the cylindrical corrugated tube to reduce the pressure. Since it is equipped with a pressure reducing device that cools the corrugated tube that is carried out from the corrugated tube outlet side of the heating device, even if the corrugated tube is already manufactured as a synthetic resin corrugated tube, the efficiency is improved. It can be molded to a well-uniform inner thickness.
第1図は本発明に係る環状の深溝を有する合成樹脂製波
付管の製造方法及びその装置の実施例を示す図、第2図
は第1図図示実施の配置状態を示す図、第3図は第1図
図示実施例のリブの配置1丁状態の別な実施例を示す図
、第4図は本発明に係る環状の深11ヤを有する合成樹
脂製波付管の製造方法及びその装置の他の実施例を示す
図、第5図は本発明に係る環状の深溝を有する合成樹脂
製波付管の製造方法及びその装置の他の実施例を示す全
体構成図、第6図は第5図図示深溝成形装置の構成図、
第7図は本発明に係る環状の深溝を有する合成樹脂製波
付管の製造方法及びその装置の別な実施例を示す全体構
成図、第8図は第7図図示加熱装置における合成樹脂裏
波付管の成形状態を示す図、第9図は従来の環状の深溝
を有する合成樹脂製波付管の製造方法を示す図である。FIG. 1 is a diagram showing an embodiment of the method and apparatus for manufacturing a synthetic resin corrugated pipe having an annular deep groove according to the present invention, FIG. 2 is a diagram showing an arrangement state of the embodiment shown in FIG. 1, and FIG. The figure shows another embodiment of the arrangement of one rib of the embodiment shown in FIG. 1, and FIG. FIG. 5 is a diagram showing another embodiment of the apparatus, and FIG. 5 is an overall configuration diagram showing another embodiment of the method and apparatus for manufacturing a synthetic resin corrugated pipe having an annular deep groove according to the present invention. FIG. 5 is a configuration diagram of the illustrated deep groove forming device,
FIG. 7 is an overall configuration diagram showing another embodiment of the method and apparatus for manufacturing a synthetic resin corrugated tube having an annular deep groove according to the present invention, and FIG. 8 is a synthetic resin backing in the heating device shown in FIG. 7. FIG. 9 is a diagram showing a molded state of a corrugated tube, and is a diagram showing a conventional method for manufacturing a synthetic resin corrugated tube having an annular deep groove.
Claims (5)
れの組成物又は混合物のいずれかによって形成され波ピ
ッチが大きく溝の深さの浅い波付管を半溶融状態で成形
し、しかる後所望ピッチ幅の溝を成形してなる環状の深
溝を有する合成樹脂製波付管の製造方法。(1) A corrugated tube made of a composition or a mixture of polyolefin, polyvinyl chloride, or rubber and having a large wave pitch and shallow groove depth is molded in a semi-molten state, and then the desired pitch width is formed. A method for manufacturing a synthetic resin corrugated pipe having an annular deep groove formed by molding a groove.
レフィン、ポリ塩化ビニル、ゴムのそれぞれの組成物又
は混合物のいずれかの樹脂を金型成形部において該樹脂
の外壁を金型内面に押し当てて管外面を該金型内面と同
一形状にして連続的に合成樹脂製波付管を成形するもの
において、上記金型成形部の成形波付管出口側に大きい
ピッチ幅から徐々に小さいピッチ幅に変化しながら螺旋
状に形成されるリブが外周面に設けられている円筒と、
該円筒を所定速度で回転させる回転駆動手段とを備えた
深溝成形装置を上記金型成形部から搬出されてくる波付
管の外周面に前記リブを接触させて配置したことを特徴
とする環状の深溝を有する合成樹脂製波付管の製造装置
。(2) A resin of a composition or a mixture of polyolefin, polyvinyl chloride, and rubber is extruded into a smooth cylindrical shape by an extruder, and the outer wall of the resin is pressed against the inner surface of the mold in the mold forming section. In continuous molding of synthetic resin corrugated tubes with the outer surface of the tube in the same shape as the inner surface of the mold, a pitch width gradually decreases from a large pitch width to a gradually smaller pitch width on the exit side of the molded corrugated tube of the mold forming section. a cylinder whose outer peripheral surface is provided with ribs formed in a spiral shape while changing;
An annular molding device characterized in that a deep groove molding device equipped with a rotation drive means for rotating the cylinder at a predetermined speed is disposed with the ribs in contact with the outer peripheral surface of the corrugated tube carried out from the mold molding section. Manufacturing equipment for synthetic resin corrugated pipes with deep grooves.
れの組成物又は混合物のいずれかによって波ピッチが大
きく溝の深さが浅く成形された波付管を半溶融状態に加
熱し、しかる後所望ピッチ幅の溝を成形するようにした
環状の深溝を有する合成樹脂製波付管の製造方法。(3) A corrugated tube formed with a polyolefin, polyvinyl chloride, or rubber composition or mixture with a large wave pitch and shallow groove depth is heated to a semi-molten state, and then the desired pitch width is obtained. A method for manufacturing a synthetic resin corrugated pipe having an annular deep groove formed by forming a groove.
レフィン、ポリ塩化ビニル、ゴムのそれぞれの組成物又
は混合物のいずれかによって形成される波付管を連続的
に所定時間加熱し、半溶融状態にせしめる加熱装置と、
該加熱装置の波付管出口側に大きいピッチ幅から徐々に
小さいピッチ幅に変化しながら螺旋状に形成されるリブ
が外周面に設けられている円筒と、該円筒を所定速度で
回転させる回転駆動手段とを備えた深溝成形装置を上記
加熱装置から搬出されてくる波付管の外周面に前記リブ
を接触させて配置したことを特徴とする環状の深溝を有
する合成樹脂製波付管の製造装置。(4) A corrugated tube made of either a composition or a mixture of polyolefin, polyvinyl chloride, and rubber extruded into a smooth cylindrical shape by an extruder is continuously heated for a predetermined period of time to a semi-molten state. a heating device for
A cylinder whose outer circumferential surface is provided with ribs formed in a spiral shape while gradually changing from a large pitch width to a small pitch width on the corrugated tube outlet side of the heating device, and a rotation for rotating the cylinder at a predetermined speed. A corrugated tube made of synthetic resin having an annular deep groove, characterized in that a deep groove forming device comprising a driving means is arranged with the ribs in contact with the outer peripheral surface of the corrugated tube carried out from the heating device. Manufacturing equipment.
レフィン、ポリ塩化ビニル、ゴムのそれぞれの組成物又
は混合物のいずれかによって形成される波付管を連続的
に所定時間加熱して半溶融状態にせしめる加熱装置と、
前記筒状の波付管内の空気を吸出して減圧する減圧装置
と、前記加熱装置の波付管出口側から搬出されてくる波
付管を冷却する冷却装置とを備えたことを特徴とする環
状の深溝を有する合成樹脂製波付管の製造装置。(5) A corrugated tube made of each composition or mixture of polyolefin, polyvinyl chloride, and rubber extruded into a smooth cylindrical shape by an extruder is heated continuously for a predetermined period of time to a semi-molten state. a heating device for
An annular tube characterized by comprising: a pressure reducing device that sucks out air in the cylindrical corrugated tube to reduce the pressure; and a cooling device that cools the corrugated tube carried out from the corrugated tube exit side of the heating device. Manufacturing equipment for synthetic resin corrugated pipes with deep grooves.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP22002188A JPH0269219A (en) | 1988-09-02 | 1988-09-02 | Method and apparatus for manufacturing synthetic resin corrugated tube having deep annular groove |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP22002188A JPH0269219A (en) | 1988-09-02 | 1988-09-02 | Method and apparatus for manufacturing synthetic resin corrugated tube having deep annular groove |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH0269219A true JPH0269219A (en) | 1990-03-08 |
Family
ID=16744691
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP22002188A Pending JPH0269219A (en) | 1988-09-02 | 1988-09-02 | Method and apparatus for manufacturing synthetic resin corrugated tube having deep annular groove |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH0269219A (en) |
-
1988
- 1988-09-02 JP JP22002188A patent/JPH0269219A/en active Pending
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