JPH02112931A - Manufacture of synthetic resin pipe - Google Patents
Manufacture of synthetic resin pipeInfo
- Publication number
- JPH02112931A JPH02112931A JP26678688A JP26678688A JPH02112931A JP H02112931 A JPH02112931 A JP H02112931A JP 26678688 A JP26678688 A JP 26678688A JP 26678688 A JP26678688 A JP 26678688A JP H02112931 A JPH02112931 A JP H02112931A
- Authority
- JP
- Japan
- Prior art keywords
- synthetic resin
- belt
- endless
- molding
- protruded
- 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 80
- 239000000057 synthetic resin Substances 0.000 title claims abstract description 80
- 238000004519 manufacturing process Methods 0.000 title claims description 15
- 238000000465 moulding Methods 0.000 claims abstract description 75
- 239000000463 material Substances 0.000 claims abstract description 37
- 238000004804 winding Methods 0.000 claims abstract description 15
- 238000000034 method Methods 0.000 claims description 12
- 238000005520 cutting process Methods 0.000 abstract description 2
- 238000009877 rendering Methods 0.000 abstract 1
- 230000003014 reinforcing effect Effects 0.000 description 4
- 238000007493 shaping process Methods 0.000 description 4
- 230000000379 polymerizing effect Effects 0.000 description 3
- 239000012778 molding material Substances 0.000 description 2
- 229910001018 Cast iron Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000005304 joining Methods 0.000 description 1
- 239000010985 leather Substances 0.000 description 1
- 239000012768 molten material Substances 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000002250 progressing effect Effects 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 239000005060 rubber Substances 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000009751 slip forming Methods 0.000 description 1
- 229920003051 synthetic elastomer Polymers 0.000 description 1
- 239000005061 synthetic rubber Substances 0.000 description 1
- 229920001169 thermoplastic Polymers 0.000 description 1
- 239000004416 thermosoftening plastic Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Landscapes
- Rigid Pipes And Flexible Pipes (AREA)
- Shaping Of Tube Ends By Bending Or Straightening (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野]
本発明は耐圧強度が要求される大径の電線保護管その他
の地中埋設管として使用に適した耐圧合成樹脂管の製造
方法に関するものである。[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a method for producing a pressure-resistant synthetic resin pipe suitable for use as a large-diameter electric wire protection pipe or other underground pipes that require pressure-resistant strength. be.
〔従来の技fネi]
従来から、地中埋設管としては耐圧強度が要求されるこ
とから、ヒユーム管や鋳鉄管などが使用されているが、
径の割りには重量が大きくなって取扱い難く、施工性に
難点を有するものである。[Conventional Techniques] Traditionally, underground pipes are required to have high pressure resistance, so pipes such as humid pipes and cast iron pipes have been used.
The weight is large relative to the diameter, making it difficult to handle, and there are difficulties in workability.
このため、合成樹脂材によって外周面に全長に亘って螺
旋突条を一体に形成し、該螺旋突条からなる管壁によっ
て耐圧強度を持たせるようにした合成樹脂管が開発され
ている。For this reason, a synthetic resin pipe has been developed in which a spiral protrusion is integrally formed on the outer circumferential surface over the entire length using a synthetic resin material, and the pipe wall made of the helical protrusion provides pressure resistance.
このような合成樹脂管の製造方法としては、例えば、仮
想円柱上に数本の成形用回転軸を配設して、該成形用回
転軸の一端部を基台に片持状に軸架すると共に、各回転
軸を駆動手段に連結し、且つこの成形用回転軸を前記仮
想円柱の軸芯に対してやや周方向に傾斜させた状態にし
、管成形時には、成形後に螺旋状の補強条となる中空突
条部分と管内周壁となる板状部分とを有する半溶融状態
の帯状成形材を成形用グイから押し出して、該帯状成形
材を各成形軸上間に亘るように螺旋状に巻き付けると共
に、この巻き付は時に成形材の一側縁部と隣り合う他側
縁部とを順次重合溶着させ、成形軸を回転駆動させなが
ら外周面に中空突条を螺旋状に設けた合成樹脂管を連続
成形していく方法が採用されている。As a method for manufacturing such a synthetic resin pipe, for example, several molding rotation shafts are arranged on a virtual cylinder, and one end of the molding rotation shaft is cantilevered on a base. At the same time, each rotating shaft is connected to a driving means, and the forming rotating shaft is slightly inclined in the circumferential direction with respect to the axis of the virtual cylinder, and during tube forming, a spiral reinforcing strip is formed after forming. A semi-molten band-shaped material having a hollow protruding portion and a plate-like portion forming the inner circumferential wall of the pipe is extruded from a molding gou, and the band-shaped material is spirally wound so as to span between the respective forming shafts. This wrapping is sometimes done by sequentially polymerizing and welding one side edge of the molded material and the adjacent other side edge, and while rotating the molding shaft, a synthetic resin tube with hollow protrusions spirally provided on the outer circumferential surface is formed. A continuous molding method is used.
一方、可撓性を有する成形用帯状芯型を使用して螺旋状
の補強条を形成しながら合成樹脂管を製造する方法も特
開昭51−37969号公報に開示されている。On the other hand, a method of manufacturing a synthetic resin pipe while forming spiral reinforcing strips using a flexible belt-shaped molding core mold is also disclosed in JP-A-51-37969.
この方法は、押し出し機より押し出された熱可塑性合成
樹脂シートを前記成形用帯状芯型の表面に重ねた状態で
、隣接する芯型の縁端同士が接するように成形軸に螺旋
状に巻回して合成樹脂管を′成形し、樹脂シートの冷却
後、合成樹脂管の内周面から芯型を剥離して中空突条が
螺旋状に連続した管を製造するものである。In this method, a thermoplastic synthetic resin sheet extruded from an extruder is layered on the surface of the strip-shaped core mold for molding, and then wound spirally around the molding shaft so that the edges of adjacent core molds touch each other. After cooling the resin sheet, the core mold is peeled off from the inner circumferential surface of the synthetic resin tube to produce a tube with continuous hollow protrusions in a spiral shape.
しかしながら、前者の方法によると、成形用ダイにより
予め、成形後に螺旋状の補強条となる中空突条部分と管
内周壁となる板状部分とを有する半溶融状態の帯状成形
材を押し出して、成形用回転軸に高速で螺旋状に巻回す
るものであるから、中空突条部分が巻回中に型面れが生
じ、螺旋状中空突条による管壁が不均一となって高精度
で整然とした形状の管体を得ることがきわめて困難であ
った。However, according to the former method, a semi-molten band-shaped material having a hollow protruding portion that becomes a spiral reinforcing strip after molding and a plate-like portion that becomes the inner circumferential wall of the pipe is extruded in advance using a molding die, and then the material is formed. Because it is wound spirally at high speed around the rotary shaft, the hollow protrusions may become uneven during winding, and the tube wall due to the spiral hollow protrusions becomes uneven, resulting in high precision and orderly winding. It was extremely difficult to obtain a tube body with such a shape.
一方、後者の方法によれば、成形用帯状芯型によって一
応所定形状の中空突条を形成することができるが、成形
される螺旋状中空突条の全長に亘って成形用帯状芯型を
内装する必要があるため、長尺の帯状芯型を要するばか
りでなく、この帯状芯型は連続的に製造される合成樹脂
管を所望長さ毎に切断する際に一体的に切断されるため
に、再使用が不可能となって不経済であり、その上、管
の内面から該帯状芯型を除去する作業を要して生産能率
が低下することになる。さらに、帯状芯型を除去した跡
には、螺旋状の凹凸内面が形成されるので、使用に際し
て、該凹凸内面により配線作業が困難となる場合が生じ
ると共に内部に流体を流動させる場合には、流動抵抗が
増大するという問題点がある。On the other hand, according to the latter method, it is possible to form a hollow protrusion of a predetermined shape using a molding belt-like core mold, but the molding belt-like core mold can be used as an inner part over the entire length of the spiral hollow protrusion to be molded. This not only requires a long belt-shaped core mold, but also because this belt-shaped core mold is cut in one piece when cutting the continuously produced synthetic resin pipe into desired lengths. This makes it impossible to reuse the tube, which is uneconomical.Furthermore, it is necessary to remove the band-shaped core from the inner surface of the tube, resulting in a decrease in production efficiency. Furthermore, since a spirally uneven inner surface is formed at the site where the strip core mold is removed, wiring work may be difficult due to the uneven inner surface during use, and when fluid is allowed to flow inside, There is a problem that flow resistance increases.
このため、本願発明者等は、成形用回転軸上に無端成形
ベルトを螺旋状に巻回して巡回運行させると共にこの無
端成形ベルト上に半溶融状態の合成樹脂帯状材を連続的
に供給して該合成樹脂帯状材を無端成形ベルトの表面形
状に沿わせることにより突条部を成形すると共に隣接す
る突条部の谷部間を重合一体化させながら無端成形ベル
トの進行に従って合成樹脂管を成形して行き、この合成
樹脂管の成形途上において、突条部の適所を適宜なカッ
ターにより長さ方向に切開して突条部内の無端成形ヘル
ドを該切開部から外部に導出させて元の巻回位置に巡回
させ、さらに、無端成形ベルトの除去により中空に形成
された突条部の頂面に半溶融状態の合成樹脂帯状材を連
続供給して螺旋状に巻付けることにより前記切開部を被
覆することを特徴とする合成樹脂管の製造方法を開発し
たが、この方法において、最終工程時における切開部を
合成樹脂帯状材により密閉させる際に、該合成樹脂帯状
材が突条部の頂面から側方にずれて切開部を充分に密閉
し得ない場合が生じ、製品価値が低下するという問題点
があった。For this reason, the inventors of the present application have constructed an endless molding belt which is spirally wound around a molding rotating shaft and rotated around it, and a synthetic resin strip material in a semi-molten state is continuously supplied onto this endless molding belt. By aligning the synthetic resin strip material to the surface shape of the endless forming belt, a protrusion is formed, and while the valleys of adjacent protrusions are polymerized and integrated, a synthetic resin pipe is formed as the endless forming belt advances. Then, during the process of molding this synthetic resin pipe, the protrusions are incised in the length direction at appropriate locations with a suitable cutter, and the endless molded heald inside the protrusions is led out through the incisions to restore the original winding. Then, by continuously supplying a semi-molten synthetic resin strip material to the top surface of the hollow protrusion formed by removing the endless forming belt and wrapping it spirally, the cut section is closed. We have developed a method for manufacturing synthetic resin pipes that is characterized by covering the tubes with synthetic resin. In this method, when the incision is sealed with a synthetic resin strip in the final step, the synthetic resin strip covers the top of the protrusion. There is a problem in that the incision may not be sufficiently sealed due to the incision being deviated laterally from the surface, resulting in a decrease in product value.
本発明はこのような問題点を解消し、内周面が平坦な精
度のよい螺旋中空突条を有する合成樹脂管の製造方法の
提供を目的とするものである。An object of the present invention is to solve these problems and provide a method for manufacturing a synthetic resin pipe having a highly accurate spiral hollow protrusion with a flat inner circumferential surface.
(課題を解決するための手段〕
上記目的を達成するために、本発明の合成樹脂管の製造
方法は、成形用回転軸上に螺旋状に巻回されて巡回運行
する無端成形ベルトが成形用回転軸に導入される巻付は
開始部分に半溶融状態の合成樹脂帯状材を、該帯状材の
両側部に平行に突設した小突条が無端成形ベルトの頂面
両側部に夫々位置させるようにしながら連続的に供給し
て、該合成樹脂帯状材を無端成形ベルトの表面形状に沿
わせることにより無端成形ベルトを被覆した合成樹脂突
条部を成形すると共に隣接する突条部の底面側から水平
方向に延出した谷部形成用平坦部を重合一体化させなが
ら無端成形ベルトの進行に従って螺旋突条部を有する合
成樹脂管を成形し、この合成樹脂管の成形途上において
、突条部の頂面中央部を適宜なカッターにより長さ方向
に切開して突条部内の無端成形ベルトを該切開部から外
部に導出させて元の巻回位置に巡回させ、さらに、無端
成形ベルトの除去により中空に形成された突条部の頂面
における前記小突条間に半溶融状態の合成樹脂材を連続
供給して前記切開部を被覆することを特徴とするもので
ある。(Means for Solving the Problems) In order to achieve the above object, the method for manufacturing a synthetic resin pipe of the present invention includes an endless forming belt that is spirally wound around a rotating shaft for forming and moves around. The winding that is introduced onto the rotating shaft is performed by placing a half-molten synthetic resin strip at the starting part, and small protrusions protruding parallel to both sides of the strip are positioned on both sides of the top surface of the endless molded belt. By continuously supplying the synthetic resin strip material along the surface shape of the endless forming belt, a synthetic resin ridge covering the endless forming belt is formed, and the bottom side of the adjacent ridge is formed. A synthetic resin pipe having a helical protrusion is formed as the endless forming belt advances while polymerizing and integrating flat parts for forming troughs extending horizontally from the trough. Cut the center part of the top surface in the length direction with an appropriate cutter, lead out the endless molded belt inside the protruding part to the outside through the cut part, circulate it to the original winding position, and then remove the endless molded belt. The invention is characterized in that a semi-molten synthetic resin material is continuously supplied between the small protrusions on the top surface of the hollow protrusion to cover the incision.
成形用回転軸を回転させるか或いは無端成形ベルトを適
宜な駆動機構によって積極的に循環移動させると、無端
成形ベルトは成形用回転軸上を一端側から他端側に向か
って螺旋状に進行し、成形用回転軸から外れる巻回終端
部は再び成形用回転軸の一端側に戻って螺旋状に巻回す
る。When the forming rotating shaft is rotated or the endless forming belt is actively circulated by a suitable drive mechanism, the endless forming belt spirally moves from one end to the other end on the forming rotating shaft. The end portion of the winding that comes off the molding rotation shaft returns to one end side of the molding rotation shaft and is spirally wound.
このように成形用回転軸上を螺旋状に巡回する無端成形
ベルトの巻き込み開始部上に半溶融状態の帯状合成樹脂
材を、その両側部に平行に突設した小突条が無端成形ベ
ルトの頂面両側部に夫々位置させるようにしながら供給
すると、該帯状合成樹脂材が平帯形状の場合には無端成
形ヘルドの外形に密接するように変形しながら無端成形
ベルトを被覆し、無端成形ベルトの断面形状に沿うよう
に予め成形されている場合には、そのまま無端成形ベル
ト上に重合、被覆して無端成形ベルトと共に成形用回転
軸に螺旋状に巻回されていく。In this way, the belt-like synthetic resin material in a semi-molten state is placed on the winding start part of the endless forming belt that circulates spirally on the forming rotation shaft, and small protrusions protruding parallel to both sides of the belt form the endless forming belt. When the belt-shaped synthetic resin material is fed while being positioned on both sides of the top surface, when the belt-shaped synthetic resin material is flat, it deforms to closely fit the outer shape of the endless molding heddle and covers the endless molding belt, forming an endless molding belt. If it has been previously formed to follow the cross-sectional shape of , it is polymerized and coated onto the endless forming belt as it is, and is spirally wound together with the endless forming belt around the forming rotating shaft.
こうして、帯状合成樹脂材が無端成形ベルトと共に成形
用回転軸上に螺旋状に巻回されると、無端成形ベルトに
密接した部分が連続螺旋突条部を形成していくと共に該
突条部の両端から水平方向に延出する平坦部が無端成形
ヘルドの内周面に沿って次に巻回される水平延出平坦部
と重合一体化し、成形用回転軸上で内周面が平坦で且つ
外周側に螺旋突条部を有する合成樹脂管が連続形成され
る。In this way, when the belt-shaped synthetic resin material is spirally wound around the molding rotating shaft together with the endless molding belt, the part that is in close contact with the endless molding belt forms a continuous spiral protrusion, and the protrusion of the protrusion The flat parts extending horizontally from both ends are superimposed and integrated with the horizontally extending flat part wound next along the inner circumferential surface of the endless forming heald, so that the inner circumferential surface is flat on the forming rotation axis, and A synthetic resin pipe having a spiral protrusion on the outer peripheral side is continuously formed.
こうして形成される合成樹脂管は、成形用回転軸上を進
行中に適宜冷却され、カッターの位置に達すると、該カ
ッターによりその螺旋突条部の一部が長さ方向に連続的
に切開されてその切開個所を押し広げながら無端成形ベ
ルトが成形用回転軸から離間していく。The synthetic resin tube thus formed is appropriately cooled while traveling on the molding rotating shaft, and when it reaches the cutter position, a part of the spiral protrusion is continuously cut in the length direction by the cutter. The endless molding belt is separated from the molding rotating shaft while pushing the incision apart.
無端成形ベルトが抜き取られて中空となった螺旋突条部
は、直ちにその切断部の広がりを閉止する方向に復元す
る一方、成形用回転軸から離間した無端成形ベルトは再
び帯状合成樹脂材巻き込み開始端部側に巡回し、前記同
様にして成形用回転軸上に巻回されて帯状合成樹脂材の
成形を行い、合成樹脂管を製造していく。The spiral protrusion, which became hollow when the endless molding belt was pulled out, immediately returns to the direction that closes the spread of the cut part, while the endless molding belt, which has separated from the molding rotation shaft, starts to wrap around the belt-shaped synthetic resin material again. It circulates to the end side and is wound around the molding rotating shaft in the same manner as described above to mold the belt-shaped synthetic resin material, thereby producing a synthetic resin pipe.
さらに、中空となった螺旋突条部は、成形用回転軸上の
進行途上においてその頂面の小突条間に半溶融状態の合
成樹脂材を連続供給して螺旋状に巻付けていくことによ
り、小突条によってズレを防止しながら前記切開部を被
覆するものである。Furthermore, while the hollow spiral protrusion is progressing on the molding rotating shaft, semi-molten synthetic resin material is continuously supplied between the small protrusions on the top surface of the hollow spiral protrusion and wound in a spiral shape. This allows the incision to be covered while preventing displacement by the small protrusions.
こうして、均一な中空突条部を有し、内周面が一定径の
平坦な耐圧合成樹脂管を製造することができる。In this way, a pressure-resistant synthetic resin pipe having uniform hollow protrusions and a flat inner circumferential surface having a constant diameter can be manufactured.
本発明の実施例を図面について説明すると、複数本の成
形用回転軸(2)(2)・・・(2)を同心円上に所定
間隔ごとに配設してこれらの成形用回転軸(2)の一端
部を基枠(1)に回転自在に支持させると共に同心円上
に所定間隔毎に配設された複数本の成形用回転軸(2)
上には、断面台形状の無端成形ベルト(3)が螺旋状に
数回、所望ピッチを存して巻回されていると共に、巻回
された無端成形ベルト(3)間に沿って、製造される合
成樹脂管(a)の谷部(C)に沿う無端整形ベルト(4
)を必要に応じて巻回されてあり、これらの無端成形ベ
ルト(3)及び整形ベルト(4)は、第2図に示すよう
に、巻回終端で成形用回転軸(2)かみ離間し、元の巻
回始端部に適宜なガイドロール(5) (6)を介して
連続的に巡回するようになっである。An embodiment of the present invention will be described with reference to the drawings. A plurality of molding rotating shafts (2) (2)...(2) are arranged concentrically at predetermined intervals. ), one end of which is rotatably supported by the base frame (1), and a plurality of molding rotating shafts (2) arranged concentrically at predetermined intervals.
On top, an endless molded belt (3) with a trapezoidal cross section is wound spirally several times at a desired pitch, and along between the wound endless molded belts (3), a manufacturing process is carried out. An endless shaping belt (4) along the trough (C) of the synthetic resin pipe (a)
) are wound as necessary, and these endless forming belts (3) and shaping belts (4) are separated by the shaping rotating shaft (2) at the end of the winding, as shown in Figure 2. , so as to continuously circulate around the original winding start end via appropriate guide rolls (5) and (6).
これらの無端成形ベルト(3)及び整形ベルト(4)は
ゴム、合成樹脂、皮革、補強芯入り合成ゴム、或いは多
数のアルミニウムブロック片を長さ方向に連続的に接合
することによっても作成することができ、その断面形状
も、上記台形状の他、半円形状や角形、等に形成しても
よく、さらに、全長に亘って同一断面にすることなく、
所定長さ寸法毎に断面形状を異にしたベルトを使用する
こともできる。These endless molded belts (3) and shaped belts (4) can also be made of rubber, synthetic resin, leather, synthetic rubber with a reinforcing core, or by continuously joining a large number of aluminum block pieces in the length direction. In addition to the above trapezoidal shape, the cross-sectional shape may also be semicircular, square, etc., and the cross-sectional shape may not be the same over the entire length.
It is also possible to use belts with different cross-sectional shapes for each predetermined length.
今、各成形用回転軸(2)を同一方向に回転させると共
に押出成形手段(7)の成形用グイ(8)から無端成形
ベルト(3)の周長よりも大なる一定幅を有する半溶融
状態の合成樹脂帯状材(9)を前記無端成形ベルト(3
)の巻回始端部上に供給する。Now, each molding rotating shaft (2) is rotated in the same direction, and a semi-molten material having a constant width larger than the circumference of the endless molding belt (3) is melted from the molding guide (8) of the extrusion molding means (7). The synthetic resin strip material (9) in the state is attached to the endless molded belt (3).
) onto the starting end of the winding.
この際、成形用グイ(8)によって合成樹脂帯状材(9
)の表面両側部に前記無端成形ヘルド(3)の頂面両角
部間の間隔を存して小突条00)0ωを形成しながら押
し出し、該小突条0n)00)を無端成形ベルト(3)
の頂面両角部に一致するように供給するものであり、該
合成樹脂帯状材(9)が平帯形状に形成されている場合
には、その中央部が無端成形ベルト(3)の頂面に密接
し、両側部が無端成形ベルト(3)の両側面に沿って密
接させて突条部(b)を成形したのち、無端成形ベルト
(3)の底面から両側方に向かって水平方向に延出する
平坦部(11)θ2)に屈曲形成されながら成形用回転
軸(2)上に供給される。At this time, the synthetic resin strip material (9) is
) on both sides of the surface of the endless molded heald (3) while forming a small protrusion 00)0ω with a gap between both corners of the top surface of the endless molded heald (3), and then extrude the small protrusion 0n)00) into an endless molded belt ( 3)
When the synthetic resin strip material (9) is formed into a flat strip shape, the center portion thereof is supplied so as to coincide with both corners of the top surface of the endless molded belt (3). After molding the protrusions (b) so that both sides are in close contact with each other along both sides of the endless molded belt (3), the protrusions (b) are formed in a horizontal direction from the bottom of the endless molded belt (3) toward both sides. The molding material is fed onto the molding rotating shaft (2) while being bent into an extending flat portion (11) θ2).
又、成形用ダイス(8)によって無端成形ベルト(3)
の断面形状と同形状の突条部(b)に成形すると共に該
突条部(b)の頂面両側部に小突条00)θ0)を、両
側下年に平坦部(Ill(12)を一体に成形しながら
押し出して無端成形ベルト(3)に該突条部(b)を被
覆させてもよい。Also, the endless forming belt (3) is formed by the forming die (8).
A protrusion (b) having the same cross-sectional shape as the protrusion (b) is formed, and small protrusions 00)θ0) are formed on both sides of the top surface of the protrusion (b), and flat portions (Ill(12)) are formed on the lower sides of both sides. The protrusions (b) may be covered by the endless molded belt (3) by extruding them while integrally molding them.
こうして無端成形ヘルド(3)の表面に被覆させた合成
樹脂帯状材(9)からなる突条部(b)は、無端成形ヘ
ルド(3)と共に成形用回転軸(2) (2)・・・(
2)上に螺旋状に巻付けられる。In this way, the protrusions (b) made of the synthetic resin strip material (9) coated on the surface of the endless molded heald (3), together with the endless molded heald (3), form the molding rotating shaft (2) (2)... (
2) Wrapped in a spiral on top.
この時、先に巻回する突条部(b)の一方の延出平坦部
(11)上に次に巻回する突条部(b)が載置され、且
つ該突条部(b)の他方の延出平坦部02)が重合溶着
して谷部(C)に形成され、順次突条部(b)が無端成
形ベルト(3)と共に螺旋状に巻付けられて連続螺旋突
条を有する合成樹脂管(a)が形成されていく。At this time, the protruding part (b) to be wound next is placed on one of the extended flat parts (11) of the protruding part (b) to be wound first, and the protruding part (b) to be wound next is The other extended flat part 02) is polymerized and welded to form the valley part (C), and the protruding part (b) is sequentially wound helically together with the endless molded belt (3) to form a continuous spiral protruding part. A synthetic resin pipe (a) having the following properties is formed.
この合成樹脂管(a)の内周面、即ち、複数本の成形用
回転軸(2) (2)・・・(2)によって形成される
仮想円上に沿った面は、突条部(b)の底面を密閉する
平坦部(II)と、該平坦部(11)に重合溶着した平
坦部θ2)とによって均一な径を有する平坦面に形成さ
れる。The inner circumferential surface of this synthetic resin pipe (a), that is, the surface along the virtual circle formed by the plurality of molding rotating shafts (2) (2)...(2), A flat surface having a uniform diameter is formed by the flat part (II) sealing the bottom surface of b) and the flat part θ2) polymerized and welded to the flat part (11).
なお、無端成形ベルト(3)と同調して螺旋状に巡回運
行する整形ベルト(4)は、無端成形ベルト(3)を包
被した突条部(b)(b)の両側面を無端成形ベルト(
3)側に密接させて所定の形状に保持すると共に無端成
形ベルト(3)のピッチを補正するものであるが、必ず
しも必要としない。The shaping belt (4), which circulates in a spiral manner in synchronization with the endless forming belt (3), has endless forming belts on both sides of the protrusion (b) (b) that covers the endless forming belt (3). belt(
3) to hold it in a predetermined shape while correcting the pitch of the endless molded belt (3), but it is not necessarily necessary.
こうして成形用回転軸で2)上に形成される螺旋突条を
有する合成樹脂管(a)は、成形用回転軸(2)上を進
行中に適宜冷却されて硬化し、無端成形ベルト(3)の
外方適所に配設したカッター02)の位置に達すると、
第3図に示すように、該カッター03)によって突条部
(b)の頂部の中央がスリット状に連続的に切断されて
切開かれ、この切開部側を拡開させながら無端成形ベル
ト(3)が抜は出して成形用回転軸(2)から離間し、
元の巻回始端側に巡回して前記同様に合成樹脂帯状材(
9)を螺旋状に巻装させて合成樹脂管(a)を連続成形
するものである。In this way, the synthetic resin pipe (a) having a spiral protrusion formed on the molding rotating shaft (2) is suitably cooled and hardened while traveling on the molding rotating shaft (2), and the endless molding belt (3) ), when the cutter 02) is placed at a suitable location outside the cutter 02).
As shown in FIG. 3, the center of the top of the protrusion (b) is continuously cut into a slit by the cutter 03), and the endless forming belt (3) is opened while expanding the incision side. ) is pulled out and separated from the molding rotating shaft (2),
The synthetic resin strip material (
9) is wound spirally to continuously form a synthetic resin pipe (a).
なお、突条部(b)から無端成形ヘルド(3)が抜き取
られる際に、該突条部(b)が形部れの生じない程度に
まで冷却されているものであり、切開部側を押し広げて
無端成形ベルト(3)が抜き取られたのちには該切開部
側は元の状態に弾性的に復元するものである。Note that when the endless molded heald (3) is removed from the protrusion (b), the protrusion (b) has been cooled to the extent that no deformation occurs, and the incision side is After the endless molded belt (3) is pulled out by pushing it apart, the cut side elastically returns to its original state.
こうして、突条部(b)から無端成形ベルト(3)が抜
き取られたのち、合成樹脂管(a)はさらに成形用回転
軸(2)に沿って進行してその進行途上で、合成樹脂帯
状材(9)とは別の細幅の半溶融状態の合成樹脂帯状材
又は紐状材θωを突条部(b)の両側小突条00θ0)
間に連続供給して螺旋状に巻付け、前記切開部04)を
被覆、閉止したのち、成形用回転軸(2)から外れて製
品となるものである。In this way, after the endless molded belt (3) is extracted from the protrusion (b), the synthetic resin pipe (a) further advances along the molding rotation shaft (2), and on the way, the synthetic resin belt A narrow half-molten synthetic resin strip or string material θω, different from the material (9), is attached to small protrusions on both sides of the protrusion portion (b) (00θ0)
After being continuously supplied between the molding parts and spirally wound to cover and close the cutout part 04), the molding material is removed from the molding rotation shaft (2) and becomes a product.
この際、半熔融状態の合成樹脂材05)は、平帯状であ
れば、突条部(b)の両側小突条00)00)によって
両側方へのズレを阻止されなから突条部(b)の頂面に
溶着し、紐状材の場合には、適宜なローラを使用して平
帯状に展伸させるものである。At this time, if the synthetic resin material 05) in a semi-molten state is in the form of a flat band, it will not be prevented from shifting to both sides by the small protrusions 00)00) on both sides of the protrusion (b); In the case of a string-like material, it is welded to the top surface of b) and stretched into a flat strip using an appropriate roller.
なお、各成形用回転軸(2)は基枠(1)側においてモ
ータa5′)から適宜な駆動機構を介し一斉に同一方向
に回転させることにより、成形用回転軸(2)上に巻回
した無端成形ベルト(4)を一体に運行させるようにし
ているが、このような回転駆動機構によることなく、無
端成形ベルト(4)を成形用回転軸(2)から離間した
個所において回転駆動プーリを介して強制的に移動させ
ることにより、成形用回転軸(2)を一体に回転させる
ようにしてもよい。In addition, each molding rotation shaft (2) is wound on the molding rotation shaft (2) by rotating the molding rotation shaft (2) all at once in the same direction via a suitable drive mechanism from the motor a5') on the base frame (1) side. The endless forming belt (4) is moved integrally, but instead of using such a rotational drive mechanism, the endless forming belt (4) is operated by a rotational drive pulley at a location separated from the forming rotating shaft (2). The molding rotating shaft (2) may be rotated together by forcibly moving the molding shaft (2) through the molding shaft.
又、以上の実施例において、口径の異なった合成樹脂管
を製造するには、第1図において、中心軸θG)の前後
端部と各成形用回転軸(2)の前後端部間とを連結した
リンク07)を拡縮させて成形用回転軸により形成され
る仮想円を大小に変化させればよい。In addition, in the above embodiment, in order to manufacture synthetic resin pipes with different diameters, in FIG. The virtual circle formed by the molding rotation shaft may be changed in size by expanding or contracting the connected links 07).
(発明の効果〕
以上のように本発明の合成樹脂管の製造方法によれば、
成形用回転軸上に無端成形ベルトを螺旋状に巻回して巡
回運行させると共にこの無端成形ベルト上に半溶融状態
の合成樹脂帯状材を連続的に供給して該合成樹脂帯状材
を無端成形ベルトの表面形状に沿わせることにより突条
部を成形すると共に隣接する突条部の谷部間を重合一体
化させながら無端成形ベルトの進行に従って合成樹脂管
を成形して行くものであるから、無端成形ヘルドによっ
゛ζ型型面することなく整然とした所定形状の螺旋突条
部を成形しながら精度よく合成樹脂管を製造することが
できると共に、この合成樹脂管の成形途上において、突
条部の適所を適宜なカッターにより長さ方向に切開して
突条部内の無端成形ベルトを該切開部から外部に導出さ
せて元の巻回位置に巡回させるものであるから、一定長
さの無端成形ヘルドを繰り返して連続的に成形用回転軸
上を巡回運行させながら能率良く合成樹脂管の製造を行
うことができ、その上、無端成形ベルトの除去により突
条部が中空に形成されるので、合成樹脂管の軽量化を図
ることができて、運搬その他の取扱が容易となるもので
あり、さらに、この中空螺旋状突条部によって管壁の耐
圧強度が増大するものである。(Effects of the Invention) As described above, according to the method for manufacturing a synthetic resin pipe of the present invention,
An endless molding belt is spirally wound around a rotating shaft for molding and rotated, and a semi-molten synthetic resin strip is continuously supplied onto the endless molding belt to form an endless molding belt. The synthetic resin pipe is molded by following the progress of the endless forming belt while molding the protrusions along the surface shape of the endless forming belt while polymerizing and integrating the valleys of adjacent protrusions. By using the molding heald, it is possible to manufacture a synthetic resin pipe with high accuracy while molding a spiral protrusion in an orderly and predetermined shape without creating a ζ-shaped mold surface. The endless molded belt inside the protrusion is led out from the cut in the longitudinal direction with a suitable cutter and circulated to the original winding position, so the endless molded belt of a certain length Synthetic resin pipes can be manufactured efficiently by repeating helding and continuously moving around on the molding rotating shaft.Furthermore, since the protrusions are formed hollow by removing the endless molding belt, The synthetic resin pipe can be made lighter, making it easier to transport and handle, and the hollow spiral protrusion increases the pressure resistance of the pipe wall.
さらに、本発明においては、巡回運行する無端成形ベル
トが成形用回転軸に導入される巻付は開始部分に半溶融
状態の合成樹脂帯状材を、該帯状材の両側部に平行に突
設した小突条が無端成形ベルトの頂面両側部に夫々位置
させるようにしながら連続的に供給するので、無端成形
ベルトに対する合成樹脂帯状材の位置づけが正確に行う
ことができると共に、成形用回転軸上で形成された合成
樹脂管の螺旋突条部の中央部の切開部から無端成形ベル
トを除去したのち、該突条部の頂面における前記小突条
間に半溶融状態の合成樹脂材を連続供給する時に、これ
らの小突条によって合成樹脂材のズレを確実に防止する
ことができ、前記切開部を正確且つ美麗に被覆、閉止す
ることができるものである。Furthermore, in the present invention, a semi-molten synthetic resin strip is provided at the starting portion of the winding where the circulating endless forming belt is introduced onto the rotating shaft for forming, protruding parallel to both sides of the strip. Since the small protrusions are continuously supplied while being positioned on both sides of the top surface of the endless forming belt, it is possible to accurately position the synthetic resin strip material with respect to the endless forming belt, and also to ensure that the small protrusions are positioned on both sides of the top surface of the endless forming belt. After removing the endless molded belt from the cutout in the center of the spiral protrusion of the synthetic resin pipe, a semi-molten synthetic resin material is continuously applied between the small protrusions on the top surface of the protrusion. When feeding, these small protrusions can reliably prevent the synthetic resin material from shifting, and the incision can be accurately and beautifully covered and closed.
図面は本発明の実施例を示すもので、第1図は合成樹脂
管の製造中における装置の簡略縦断側面図、第2図はそ
の簡略1i、を断正面図、第3図は合成樹脂管の管壁成
形状態を説明するための縦断側面図、第4図はその一部
の拡大断面図である。
(2)・・・成形用回転軸、(3)・・・無端成形ベル
ト、(9)05)・・・合成樹脂帯状材、(10) (
10)・・・小突条、(I+)02)・・・平坦部、0
3)・・・カッター、圓・・・切開部、(a))・・・
合成樹脂管、(b)・・・突条部。The drawings show an embodiment of the present invention; FIG. 1 is a simplified vertical sectional side view of the apparatus during the production of synthetic resin pipes, FIG. FIG. 4 is an enlarged cross-sectional view of a part of the tube wall. (2)...Rotating shaft for molding, (3)...Endless molding belt, (9)05)...Synthetic resin strip material, (10) (
10)...Small protrusion, (I+)02)...Flat part, 0
3)...cutter, circle...incision, (a))...
Synthetic resin pipe, (b)... projecting portion.
Claims (1)
無端成形ベルトが成形用回転軸に導入される巻付け開始
部分に半溶融状態の合成樹脂帯状材を、該帯状材の両側
部に平行に突設した小突条が無端成形ベルトの頂面両側
部に夫々位置させるようにしながら連続的に供給して、
該合成樹脂帯状材を無端成形ベルトの表面形状に沿わせ
ることにより無端成形ベルトを被覆した合成樹脂突条部
を成形すると共に隣接する突条部の底面側から水平方向
に延出した谷部形成用平坦部を重合一体化させながら無
端成形ベルトの進行に従って螺旋突条部を有する合成樹
脂管を成形し、この合成樹脂管の成形途上において、突
条部の頂面中央部を適宜なカッターにより長さ方向に切
開して突条部内の無端成形ベルトを該切開部から外部に
導出させて元の巻回位置に巡回させ、さらに、無端成形
ベルトの除去により中空に形成された突条部の頂面にお
ける前記小突条間に半溶融状態の合成樹脂材を連続供給
して前記切開部を被覆することを特徴とする合成樹脂管
の製造方法。1. An endless molding belt that is spirally wound around a molding rotating shaft and traveling around is introduced into the molding rotating shaft and a half-molten synthetic resin strip is placed on both sides of the belt. Continuously supply the endless forming belt so that the small protrusions protruding parallel to the parts are located on both sides of the top surface of the endless forming belt, respectively.
By aligning the synthetic resin strip material along the surface shape of the endless molded belt, a synthetic resin protrusion covering the endless molded belt is formed, and a trough extending horizontally from the bottom side of the adjacent protrusion is formed. A synthetic resin pipe having a spiral protrusion is molded as the endless forming belt advances while the flat part is polymerized and integrated. During the molding of this synthetic resin pipe, the center part of the top surface of the protrusion is cut with an appropriate cutter. The endless molded belt inside the protrusion is led out from the cut in the length direction and circulated to the original winding position, and the protrusion formed hollow by removing the endless molded belt is removed. A method for manufacturing a synthetic resin pipe, characterized in that a semi-molten synthetic resin material is continuously supplied between the small protrusions on the top surface to cover the incision.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP26678688A JPH02112931A (en) | 1988-10-22 | 1988-10-22 | Manufacture of synthetic resin pipe |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP26678688A JPH02112931A (en) | 1988-10-22 | 1988-10-22 | Manufacture of synthetic resin pipe |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH02112931A true JPH02112931A (en) | 1990-04-25 |
Family
ID=17435672
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP26678688A Pending JPH02112931A (en) | 1988-10-22 | 1988-10-22 | Manufacture of synthetic resin pipe |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH02112931A (en) |
-
1988
- 1988-10-22 JP JP26678688A patent/JPH02112931A/en active Pending
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