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JPH10235718A - Manufacture of duplex tube - Google Patents

Manufacture of duplex tube

Info

Publication number
JPH10235718A
JPH10235718A JP9037670A JP3767097A JPH10235718A JP H10235718 A JPH10235718 A JP H10235718A JP 9037670 A JP9037670 A JP 9037670A JP 3767097 A JP3767097 A JP 3767097A JP H10235718 A JPH10235718 A JP H10235718A
Authority
JP
Japan
Prior art keywords
tube
pipe
temperature difference
cooling
cooling water
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
JP9037670A
Other languages
Japanese (ja)
Inventor
Katsuaki Morizaki
克明 森崎
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.)
Sekisui Chemical Co Ltd
Original Assignee
Sekisui 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 Sekisui Chemical Co Ltd filed Critical Sekisui Chemical Co Ltd
Priority to JP9037670A priority Critical patent/JPH10235718A/en
Publication of JPH10235718A publication Critical patent/JPH10235718A/en
Pending legal-status Critical Current

Links

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25Component parts, details or accessories; Auxiliary operations
    • B29C48/92Measuring, controlling or regulating
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2948/00Indexing scheme relating to extrusion moulding
    • B29C2948/92Measuring, controlling or regulating
    • B29C2948/92009Measured parameter
    • B29C2948/92209Temperature
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2948/00Indexing scheme relating to extrusion moulding
    • B29C2948/92Measuring, controlling or regulating
    • B29C2948/92323Location or phase of measurement
    • B29C2948/92428Calibration, after-treatment, or cooling zone
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2948/00Indexing scheme relating to extrusion moulding
    • B29C2948/92Measuring, controlling or regulating
    • B29C2948/92504Controlled parameter
    • B29C2948/92514Pressure
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2948/00Indexing scheme relating to extrusion moulding
    • B29C2948/92Measuring, controlling or regulating
    • B29C2948/92504Controlled parameter
    • B29C2948/92704Temperature
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2948/00Indexing scheme relating to extrusion moulding
    • B29C2948/92Measuring, controlling or regulating
    • B29C2948/92819Location or phase of control
    • B29C2948/92923Calibration, after-treatment or cooling zone
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2948/00Indexing scheme relating to extrusion moulding
    • B29C2948/92Measuring, controlling or regulating
    • B29C2948/92819Location or phase of control
    • B29C2948/92971Fluids, e.g. for temperature control or of environment

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)
  • Laminated Bodies (AREA)

Abstract

PROBLEM TO BE SOLVED: To provide a method for manufacture a synthetic resin duplex tube free from molding strain. SOLUTION: In a method for manufacture a duplex tube in which a synthetic resin in which a formed resin layer is formed on a non-foamed resin layer is extruded simultaneously from a mold, and a resin which was molded in the shape of a tube is introduced into a cooling apparatus to be cooled and cured, the surface temperature difference in the circumferential direction of the tube 4 is measured immediately before the cooling apparatus with a tube outer surface temperature sensor 8, voltage which actuates a pressure valve 7 to send water to cooling water piping 61 is changed by the temperature difference, and by controlling the flow rate of cooling water to eliminate the temperature difference of the surface of the tube 4, the peripheral surface of the tube 4 is cooled at a constant temperature.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【0001】[0001]

【発明の属する技術分野】本発明は、押出成形により複
数の樹脂が積層された複合管を製造する方法に関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a composite pipe in which a plurality of resins are laminated by extrusion.

【0002】[0002]

【従来の技術】押出成形により合成樹脂管を製造する場
合、金型から押し出された管状の樹脂を冷却水槽内に導
入して管の外面から冷却するとともに、成形歪の発生を
防止するため管内面をマンドレルにより冷却することが
行われている。マンドレル内部には冷却配管が螺旋状に
配置されており、この冷却配管には送媒管、返媒管が接
続され、温水循環による冷却でマンドレル出口での管状
樹脂内面は90度付近となるように温水の流量並びに温
度が調整され、これにより管内面の樹脂温度は周方向に
おいて平均化される。
2. Description of the Related Art When a synthetic resin tube is manufactured by extrusion molding, a tubular resin extruded from a mold is introduced into a cooling water tank to be cooled from the outer surface of the tube and to prevent the occurrence of molding distortion. It has been practiced to cool the surface with a mandrel. A cooling pipe is spirally arranged inside the mandrel, and a feeding pipe and a return pipe are connected to the cooling pipe so that the inner surface of the tubular resin at the outlet of the mandrel becomes about 90 degrees by cooling by hot water circulation. The flow rate and temperature of the hot water are adjusted, whereby the resin temperature on the inner surface of the pipe is averaged in the circumferential direction.

【0003】しかし、管外面の冷却は周方向における温
度調整がなされておらず、外周方向で5〜10℃という
温度差のある状態で冷却される。複数種類の樹脂を共押
出しにより成形して複合管を製造する場合も上記と同様
に行われるが、通常は複数樹脂の流動特性や溶融粘度な
どが異なる。
However, the outer surface of the tube is not cooled in the circumferential direction, and is cooled with a temperature difference of 5 to 10 ° C. in the outer circumferential direction. When a composite pipe is manufactured by co-extrusion of a plurality of types of resins to produce a composite tube, the same procedure is carried out as described above, but usually the flow characteristics, melt viscosity, and the like of the plurality of resins are different.

【0004】上記のように管外面は周方向における冷却
水の温度調整がなされず、更に樹脂の流動特性や溶融粘
度などが異なることにより、特に外層を発泡樹脂層とす
る場合に、押出成形された発泡樹脂層は円周方向におい
て厚みが不均一となる傾向がある。そのため、内層樹脂
層と外層樹脂層との界面は周方向において冷却による温
度差が大きくなり、結果として成形歪が発生して製品が
曲がったりするという問題があった。
As described above, the temperature of the cooling water in the circumferential direction is not adjusted on the outer surface of the tube, and the flow characteristics and melt viscosity of the resin are different. Therefore, especially when the outer layer is a foamed resin layer, it is extruded. The foamed resin layer tends to have a non-uniform thickness in the circumferential direction. Therefore, the temperature difference due to cooling at the interface between the inner resin layer and the outer resin layer is increased in the circumferential direction, and as a result, there is a problem that molding distortion occurs and the product is bent.

【0005】[0005]

【発明が解決しようとする課題】本発明は上記の問題に
着目してなされたものであって、成形歪のない合成樹脂
の複合管の製造方法を提供することを目的とする。
SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has as its object to provide a method of manufacturing a synthetic resin composite pipe having no molding distortion.

【0006】[0006]

【課題を解決するための手段】本発明の複合管の製造方
法は、非発泡の樹脂層上に発泡樹脂層を設けた合成樹脂
を金型から同時に押出して管状に成形した樹脂を、冷却
装置に導入して冷却硬化する複合管の製造方法におい
て、冷却装置の直前で管の周方向の表面温度差を測定
し、管表面の温度差を解消するように冷却水の流量又は
水温を調整することを特徴とする。
SUMMARY OF THE INVENTION A method of manufacturing a composite pipe according to the present invention is characterized in that a synthetic resin having a foamed resin layer provided on a non-foamed resin layer is simultaneously extruded from a mold to form a tubular resin. In the method of manufacturing a composite pipe which is cooled and hardened by being introduced into the cooling pipe, the surface temperature difference in the circumferential direction of the pipe is measured immediately before the cooling device, and the flow rate or the water temperature of the cooling water is adjusted so as to eliminate the temperature difference on the pipe surface. It is characterized by the following.

【0007】(作用)冷却水槽の直前で管の周方向の表
面温度差を測定し、この温度差に応じて供給される冷却
水の流量又は水温を調整すると、管表面部分の温度差に
応じて冷却水の流量又は水温により冷却速度に差が生じ
て、管表面の温度差は解消される。
(Operation) Immediately before the cooling water tank, the surface temperature difference in the circumferential direction of the pipe is measured, and the flow rate or water temperature of the cooling water supplied is adjusted according to the temperature difference. As a result, a difference occurs in the cooling rate depending on the flow rate or the water temperature of the cooling water, and the temperature difference on the pipe surface is eliminated.

【0008】[0008]

【実施例】次に本発明の実施例を図面を参照して説明す
る。 (実施例)図1は本発明複合管の製造方法の実施例を示
す断面図である。1は金型であり、外型11とマンドレ
ル12とからなる。マンドレル12に続いて補助マンド
レル2が設けられ、該補助マンドレル2の外周面には冷
却配管3が螺旋状に配置されている。冷却配管3の一端
部は送媒管31に、他の端部は返媒管32に接続され、
送媒管31及び返媒管32はともにマンドレル12及び
外型11を貫通し、流量制御器(図示略)を介して冷媒
貯溜槽(図示略)に接続されている。
Next, an embodiment of the present invention will be described with reference to the drawings. (Embodiment) FIG. 1 is a sectional view showing an embodiment of a method for manufacturing a composite pipe according to the present invention. Reference numeral 1 denotes a mold, which comprises an outer mold 11 and a mandrel 12. An auxiliary mandrel 2 is provided following the mandrel 12, and a cooling pipe 3 is spirally arranged on the outer peripheral surface of the auxiliary mandrel 2. One end of the cooling pipe 3 is connected to the medium sending pipe 31, and the other end is connected to the medium returning pipe 32,
Both the medium feeding tube 31 and the medium returning tube 32 pass through the mandrel 12 and the outer mold 11, and are connected to a refrigerant storage tank (not shown) via a flow controller (not shown).

【0009】5は管4内面に接して配置された管内面温
度センサーであり、上記流量制御器に接続され、管内面
温度センサーが検知した管4内面の温度データに基づい
て冷媒の流量又は温度を調整する。
Reference numeral 5 denotes a pipe inner surface temperature sensor disposed in contact with the inner surface of the pipe 4, which is connected to the above-mentioned flow controller, and based on the temperature data of the inner surface of the pipe 4 detected by the pipe inner surface temperature sensor, the flow rate or temperature of the refrigerant. To adjust.

【0010】6は冷却装置で、管4と平行に配置された
冷却水配管61、61と、冷却水配管61及び管4を囲
うカバー62とからなる。図2は図1のII−II線におけ
る断面図であり、冷却水配管61表面と一定距離をあけ
て等間隔で4本配置されている。冷却水配管61には管
4表面側に冷却水を噴霧するための小孔63が設けられ
ている。7、7は水量を調節するための送水圧力弁であ
る。
Reference numeral 6 denotes a cooling device comprising cooling water pipes 61, 61 arranged in parallel with the pipe 4, and a cover 62 surrounding the cooling water pipe 61 and the pipe 4. FIG. 2 is a cross-sectional view taken along the line II-II of FIG. 1, and four cooling water pipes 61 are arranged at equal intervals at a predetermined distance from the surface. The cooling water pipe 61 is provided with a small hole 63 for spraying cooling water on the surface side of the pipe 4. Reference numerals 7 and 7 are water supply pressure valves for adjusting the amount of water.

【0011】冷却装置6の直前に管外面温度センサー
8、8が管4表面と約5mmの距離をあけて管4を囲ん
で配置され、該管外面温度センサー8、8は電圧制御装
置又は温度制御器(図示略)に接続されている。
Immediately before the cooling device 6, a tube outer surface temperature sensor 8, 8 is arranged around the tube 4 at a distance of about 5 mm from the surface of the tube 4, and the tube outer surface temperature sensor 8, 8 is a voltage control device or a temperature controller. It is connected to a controller (not shown).

【0012】溶融した塩化ビニル樹脂41と塩化ビニル
の発泡樹脂42とを外型11に押出し、マンドレル12
により一旦拡径した後、補助マンドレル2に配置された
冷却配管3で管4内面を、内面温度センサー5の位置で
80℃に冷却しながら移送した。
The molten vinyl chloride resin 41 and the foamed vinyl chloride resin 42 are extruded into the outer mold 11 and the mandrel 12 is extruded.
Then, the inner surface of the pipe 4 was transferred while being cooled to 80 ° C. at the position of the inner surface temperature sensor 5 by the cooling pipe 3 arranged in the auxiliary mandrel 2.

【0013】続いて冷却装置6の直前で管外面温度セン
サー8により管4表面の温度を測定したところ、90℃
〜110℃の範囲で温度差が検出された。この温度差の
データを電圧制御装置へ送り、90℃の表面付近の冷却
水配管へ冷却水を20リットル/分の流量で、又、11
0℃の表面付近の冷却水配管へ冷却水を50リットル/
分の流量で送り、小孔63から噴霧して管4表面を冷却
した。冷却装置6の出口における管4外側の周方向の温
度差は10〜20℃であり、製品の成形歪は全くなかっ
た。
Subsequently, immediately before the cooling device 6, the temperature of the surface of the tube 4 was measured by the tube outer surface temperature sensor 8 and found to be 90 ° C.
A temperature difference was detected in the range of 110110 ° C. The data of the temperature difference is sent to the voltage control device, and the cooling water is supplied to the cooling water pipe near the surface at 90 ° C. at a flow rate of 20 liter / min.
50 liters of cooling water to the cooling water pipe near the surface at 0 ° C
Per minute and sprayed through the small holes 63 to cool the surface of the tube 4. The temperature difference in the circumferential direction outside the tube 4 at the outlet of the cooling device 6 was 10 to 20 ° C., and there was no molding distortion of the product.

【0014】[0014]

【発明の効果】本発明は以上の構成であり、冷却装置の
直前で管の周方向の表面温度差を測定し、温度差の大き
い管表面部分の冷却水の流量又は水温を調整することに
より管表面の温度差を解消する。これにより、成形歪の
ない合成樹脂の複合管を得ることができる。
The present invention has the above structure, and measures the surface temperature difference in the circumferential direction of the pipe immediately before the cooling device, and adjusts the flow rate or the water temperature of the cooling water on the pipe surface having a large temperature difference. Eliminate the temperature difference on the tube surface. This makes it possible to obtain a synthetic resin composite tube free of molding distortion.

【図面の簡単な説明】[Brief description of the drawings]

【図1】本発明の実施例を示す断面図。FIG. 1 is a sectional view showing an embodiment of the present invention.

【図2】図1のII−II線における断面図。FIG. 2 is a sectional view taken along line II-II in FIG.

【符号の説明】[Explanation of symbols]

1 :金型 2 :補助マンドレル 3 :冷却配管 4 :管 5 :管内面温度センサー 6 :冷却装置 7 :送水圧力弁 8 :管外面温度センサー 11:外型 12:マンドレル 31:送媒管 32:返媒管 61:冷却水配管 62:カバー 1: mold 2: auxiliary mandrel 3: cooling pipe 4: pipe 5: pipe inner surface temperature sensor 6: cooling device 7: water supply pressure valve 8: pipe outer surface temperature sensor 11: outer mold 12: mandrel 31: medium pipe 32: Return pipe 61: Cooling water pipe 62: Cover

───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.6 識別記号 FI B29L 23:00 ──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. 6 Identification code FI B29L 23:00

Claims (1)

【特許請求の範囲】[Claims] 【請求項1】 非発泡の樹脂層上に発泡樹脂層を設けた
合成樹脂を金型から同時に押出して管状に成形した樹脂
を、冷却装置に導入して冷却硬化する複合管の製造方法
において、冷却装置の直前で管の周方向の表面温度差を
測定し、管表面の温度差を解消するように冷却水の流量
又は水温を調整することを特徴とする複合管の製造方
法。
1. A method for producing a composite pipe, wherein a synthetic resin having a foamed resin layer provided on a non-foamed resin layer is simultaneously extruded from a mold to form a tubular resin, and the resin is introduced into a cooling device and cooled and cured. A method for manufacturing a composite pipe, comprising: measuring a surface temperature difference in a circumferential direction of a pipe immediately before a cooling device; and adjusting a flow rate or a water temperature of cooling water so as to eliminate the temperature difference on the pipe surface.
JP9037670A 1997-02-21 1997-02-21 Manufacture of duplex tube Pending JPH10235718A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP9037670A JPH10235718A (en) 1997-02-21 1997-02-21 Manufacture of duplex tube

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9037670A JPH10235718A (en) 1997-02-21 1997-02-21 Manufacture of duplex tube

Publications (1)

Publication Number Publication Date
JPH10235718A true JPH10235718A (en) 1998-09-08

Family

ID=12504080

Family Applications (1)

Application Number Title Priority Date Filing Date
JP9037670A Pending JPH10235718A (en) 1997-02-21 1997-02-21 Manufacture of duplex tube

Country Status (1)

Country Link
JP (1) JPH10235718A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107344414A (en) * 2017-08-03 2017-11-14 安徽蓝通科技股份有限公司 A kind of PVC sizing mill

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107344414A (en) * 2017-08-03 2017-11-14 安徽蓝通科技股份有限公司 A kind of PVC sizing mill

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