JPS61242823A - Molding method for polyethylene pipe - Google Patents

Molding method for polyethylene pipe

Info

Publication number
JPS61242823A
JPS61242823A JP60085005A JP8500585A JPS61242823A JP S61242823 A JPS61242823 A JP S61242823A JP 60085005 A JP60085005 A JP 60085005A JP 8500585 A JP8500585 A JP 8500585A JP S61242823 A JPS61242823 A JP S61242823A
Authority
JP
Japan
Prior art keywords
pipe
polyethylene pipe
molding jig
molding
roller
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
Application number
JP60085005A
Other languages
Japanese (ja)
Inventor
Tsuneji Ueishida
上石田　常治
Akira Sakamoto
亮 坂本
Mamoru Yamauchi
山内　衛
Koji Kato
孝司 加藤
Junji Shirogane
淳司 白金
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Resonac Corp
Original Assignee
Hitachi Chemical Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Hitachi Chemical Co Ltd filed Critical Hitachi Chemical Co Ltd
Priority to JP60085005A priority Critical patent/JPS61242823A/en
Publication of JPS61242823A publication Critical patent/JPS61242823A/en
Pending legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C71/00—After-treatment of articles without altering their shape; Apparatus therefor
    • B29C71/02—Thermal after-treatment
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C53/00—Shaping by bending, folding, twisting, straightening or flattening; Apparatus therefor
    • B29C53/02—Bending or folding
    • B29C53/08—Bending or folding of tubes or other profiled members
    • B29C53/083—Bending or folding of tubes or other profiled members bending longitudinally, i.e. modifying the curvature of the tube axis
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C53/00—Shaping by bending, folding, twisting, straightening or flattening; Apparatus therefor
    • B29C53/80—Component parts, details or accessories; Auxiliary operations
    • B29C53/82—Cores or mandrels
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C71/00—After-treatment of articles without altering their shape; Apparatus therefor
    • B29C71/02—Thermal after-treatment
    • B29C2071/022—Annealing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2023/00—Use of polyalkenes or derivatives thereof as moulding material
    • B29K2023/04—Polymers of ethylene
    • B29K2023/06—PE, i.e. polyethylene

Abstract

PURPOSE:To enable to eliminate and mitigate residual stress and bending stress of the inside of a polyethylene pipe, by so constituting the titled method that forming of the pipe is performed by extrusion molding, wound round a molding jig, the temperature is raised to the annealing temperature and the same is made to cool to the normal temperature after the lapse of a predetermined period of time. CONSTITUTION:After an end part of a polyethylene pipe 9 formed through extrusion molding has been fixed to a fixing fitment 6 of a molding jig 10 and the pipe 9 has been wound round a first roller 2, second roller 3 and third roller 4 in order while the pipe 9 is being pulled, the pipe 9 is fixed to a fixing fitment 7 and cut off. In addition to the above, when winding of the polyethylene pipe 9 round the molding jig 10 has been completed, the same is put in an annealing furnace; after the lapse of a predetermined period of time the same is left under the normal temperature as it is, it is cooled and cut off in a predetermined length. As the polyethylene pipe 9 is shrinked through heat shrinkage occuring on an annealing and cooling time, a deformation based on a warp and bend to be generated at the time of winding of the polyethylene pipe 9 round the molding jig 10 is eliminated and a product fitted to the molding jig 10 is obtained.

Description

【発明の詳細な説明】 〔発明の属する技術分野〕 本発明は押出し成形で形成したポリエチレンパイプの二
次成形法に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Technical field to which the invention pertains] The present invention relates to a method for secondary forming a polyethylene pipe formed by extrusion molding.

〔従来の技術〕[Conventional technology]

一般に、押出し成形されたポリエチレンパイプは、成形
時の残留応力か生じている為、長期間使用していると、
収縮による寸法変形か発生し固定部に応力が生じ亀裂破
損か発生する。また、ポリエチレンパイプを小さな曲面
をもって曲げると、曲げ部に生じる曲げ応力により亀裂
破損か発生したり、第５図に示すごとく腰折れが発生す
る欠点がある。In general, extruded polyethylene pipes have residual stress during molding, so if they are used for a long time,
Dimensional deformation occurs due to shrinkage, stress is generated in the fixed part, and cracking or failure occurs. Furthermore, if a polyethylene pipe is bent with a small curved surface, there is a drawback that the bending stress generated at the bent portion may cause cracking or breakage, or the bending of the pipe may occur as shown in FIG.

〔発明が解決しようとする問題点〕[Problem that the invention seeks to solve]

本発明は叙上の欠点に鑑みてなされたものであり、ポリ
エチレンパイプの２次成形において残留応力及び曲げ応
力を排除し、反りや撓みかなく且つ寸法精度の良いポリ
エチレンパイプの成形法を提供せんことを目的としたも
のである。The present invention has been made in view of the above-mentioned drawbacks, and it is an object of the present invention to provide a method for forming polyethylene pipes that eliminates residual stress and bending stress in secondary forming of polyethylene pipes, does not cause warping or bending, and has good dimensional accuracy. It is intended for this purpose.

〔問題点を解決するための手段〕[Means for solving problems]

上下目的を達成するための本発明の構成を、実施例に対
応する第１図乃至第４図を用いて説明すると、本発明は
、押出し成形で形成したポリエチレンパイプ（９）を所
望の形状か得られる成形用治具（１０）に常温で巻き付
けた後、アニール温度に上昇し所定時間経過後常温に冷
却する技術手段を講じている。The structure of the present invention for achieving the vertical purpose will be explained using FIGS. 1 to 4 corresponding to the embodiment. A technical measure is taken in which the resulting molding jig (10) is wound at room temperature, raised to an annealing temperature, and then cooled to room temperature after a predetermined period of time.

〔実施例〕〔Example〕

本発明の実施例を第１図乃至第４図に基づき以下説明す
る。Embodiments of the present invention will be described below with reference to FIGS. 1 to 4.

１０は成形用治具であり、治具ベース１の上下両端部に
ポリエチレンパイプ端部固定用の固定具６及び７が設け
られている。そして、治具ベース１の略中央部には該ベ
ース１と直交してポリエチレンパイプを所望の形状に形
成するための複数本の立形ローラー２．３．４．５が立
設されている。10 is a molding jig, and fixtures 6 and 7 for fixing the ends of polyethylene pipes are provided at both upper and lower ends of the jig base 1. A plurality of vertical rollers 2.3.4.5 are erected approximately at the center of the jig base 1, perpendicular to the base 1, for forming a polyethylene pipe into a desired shape.

次に作用を説明すると、第４図に示すとと（の蛇管８を
形成するには、先ずポリエチレンパイプ９の端部を成形
用治具１０の固定具６に固定し、次に該パイプを引張り
ながら第１０−ラー２に巻き付けそして、第２０−ラー
３、第３０−ラー４の順で最終ローラー５に巻き付けた
後ポリエチレンパイプ９を固定具７に固定し切断する。Next, to explain the operation, in order to form the flexible pipe 8 shown in FIG. The polyethylene pipe 9 is wound around the 10th roller 2 while being pulled, and then around the final roller 5 in the order of the 20th roller 3 and the 30th roller 4, and then the polyethylene pipe 9 is fixed to the fixture 7 and cut.

上記実施例は１本の蛇管８を形成する場合であり、蛇管
８を複数形成する場合には最終ローラー５に巻き付けた
後ポリエチレンパイプ９を固定具７に固定し、その後切
断しないで折り返して最終ローラー５より逆に折り返し
て第１０−ラー２に巻き付は固定具６で固定し切断する
。The above example is a case where one flexible pipe 8 is formed, and when a plurality of flexible pipes 8 are formed, the polyethylene pipe 9 is fixed to the fixture 7 after being wrapped around the final roller 5, and then folded back without being cut. It is folded back from the roller 5 and wrapped around the 10th roller 2, fixed with a fixture 6 and cut.

尚、ローラー２．３．４．５の高さを高くすることによ
って多数の蛇管８が成形用治具１０に一度にセットでき
る。成形用治具１０にポリエチレンの巻き付けが終った
ら、これをアニーリング炉に入れ所定の時間放置後常温
に放置冷却し、所定の寸法に切断する。Incidentally, by increasing the height of the rollers 2.3.4.5, a large number of flexible tubes 8 can be set in the molding jig 10 at once. After winding the polyethylene around the forming jig 10, the jig 10 is placed in an annealing furnace, left for a predetermined period of time, cooled to room temperature, and cut into a predetermined size.

従って、アニーリング時と冷却時に伴なう熱収縮により
ポリエチレンパイプ９は収縮するので、成形用治具１０
にポリエチレンパイプ９を巻き付ける時化じる反りや撓
みによる変形はなくなり成形用治具１０になじんだ形状
のものか得られる。Therefore, since the polyethylene pipe 9 contracts due to heat shrinkage during annealing and cooling, the molding jig 10
Deformation due to warping or bending that occurs when the polyethylene pipe 9 is wrapped around the pipe 9 is eliminated, and a shape that fits the molding jig 10 can be obtained.

〔発明の効果〕〔Effect of the invention〕

本発明は、押出し成形で形成したポリエチレンパイプを
所望の形状が得られる成形用治具に常温で巻き付けた後
、アニール温度に昇温し所定時間経過後常温に冷却させ
る構成としたので、ポリエチレンパイプ内の残留応力及
び曲げ応力を除去緩和することがでさ、反りや撓みがな
（且つ寸法精度の良いポリエチレンパイプの２次成形品
が得られる。The present invention has a structure in which a polyethylene pipe formed by extrusion is wound around a molding jig that can obtain a desired shape at room temperature, then heated to an annealing temperature, and then cooled to room temperature after a predetermined period of time. By removing and relaxing the residual stress and bending stress in the pipe, a secondary molded polyethylene pipe product with no warping or bending (and with good dimensional accuracy) can be obtained.

【図面の簡単な説明】[Brief explanation of the drawing]

第１図は本発明の成形用治具を示す平面図、第２図は第
１図の側面図、第３図は本発明の実施例を示す平面図、
第４図は成形後の蛇管を示す平面図、第５図は従来の蛇
管の腰折れを示す部分平面図である。 符号の説明 １・・・治具ベース　　　　２・・・第１０−ラー３・
・・第２　ｏ　−５−４・・・第３　ｏ−５−５・・・
最終ローラー　　　６・・・固定具７・・・固定具　　
　　　　８・・・蛇管９・・・ポリエチレンパイプ 第５図FIG. 1 is a plan view showing a molding jig of the present invention, FIG. 2 is a side view of FIG. 1, and FIG. 3 is a plan view showing an embodiment of the present invention.
FIG. 4 is a plan view showing the flexible tube after molding, and FIG. 5 is a partial plan view showing the bending of the conventional flexible tube. Explanation of symbols 1... Jig base 2... 10th-ra 3.
...2nd o-5-4...3rd o-5-5...
Final roller 6...Fixing tool 7...Fixing tool
8...Serial pipe 9...Polyethylene pipe Figure 5

Claims (1)

【特許請求の範囲】 １　押出し成形で形成したポリエチレンパイプを所望の
形状が得られる成形用治具に常温で巻き付けた後、アニ
ール温度に昇温し所定時間経過後常温に冷却することを
特徴とするポリエチレンパイプの成形法。 ２　成形用治具が、治具ベース上の両端に固定具を設け
固定具間に該ベースに直交して複数本のローラーを立設
させたことを特徴とする特許請求の範囲第１項記載のポ
リエチレンパイプの成形法。[Claims] 1. A polyethylene pipe formed by extrusion molding is wound around a molding jig that can obtain a desired shape at room temperature, then the temperature is raised to an annealing temperature, and after a predetermined period of time, the pipe is cooled to room temperature. Polyethylene pipe forming method. 2. Claim 1, characterized in that the molding jig is characterized in that fixtures are provided at both ends of a jig base, and a plurality of rollers are erected between the fixtures perpendicularly to the base. Polyethylene pipe forming method.
JP60085005A 1985-04-19 1985-04-19 Molding method for polyethylene pipe Pending JPS61242823A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP60085005A JPS61242823A (en) 1985-04-19 1985-04-19 Molding method for polyethylene pipe

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP60085005A JPS61242823A (en) 1985-04-19 1985-04-19 Molding method for polyethylene pipe

Publications (1)

Publication Number Publication Date
JPS61242823A true JPS61242823A (en) 1986-10-29

Family

ID=13846612

Family Applications (1)

Application Number Title Priority Date Filing Date
JP60085005A Pending JPS61242823A (en) 1985-04-19 1985-04-19 Molding method for polyethylene pipe

Country Status (1)

Country Link
JP (1) JPS61242823A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11210944A (en) * 1998-01-21 1999-08-06 Sakura Rubber Co Ltd Hose and its manufacture
JP2004094165A (en) * 2002-09-04 2004-03-25 Tokai Rika Co Ltd Display sheet and method for manufacturing the same
FR3062192A1 (en) * 2017-01-23 2018-07-27 Joseph Jean Henri Audren METHOD OF MANUFACTURING A PREFORMED HYDRAULIC FRAME WHICH IS READY TO APPLY FOR HEATING FLOORS AND WALLS
WO2020021165A1 (en) * 2018-07-25 2020-01-30 Audren Joseph Preformed ready-to-install hydraulic frame for heated floors and walls, method and device for the manufacture thereof

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11210944A (en) * 1998-01-21 1999-08-06 Sakura Rubber Co Ltd Hose and its manufacture
JP2004094165A (en) * 2002-09-04 2004-03-25 Tokai Rika Co Ltd Display sheet and method for manufacturing the same
FR3062192A1 (en) * 2017-01-23 2018-07-27 Joseph Jean Henri Audren METHOD OF MANUFACTURING A PREFORMED HYDRAULIC FRAME WHICH IS READY TO APPLY FOR HEATING FLOORS AND WALLS
WO2020021165A1 (en) * 2018-07-25 2020-01-30 Audren Joseph Preformed ready-to-install hydraulic frame for heated floors and walls, method and device for the manufacture thereof

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