JPS57133026A - Polyethylene coating of welded steel pipe - Google Patents

Polyethylene coating of welded steel pipe

Info

Publication number
JPS57133026A
JPS57133026A JP1932781A JP1932781A JPS57133026A JP S57133026 A JPS57133026 A JP S57133026A JP 1932781 A JP1932781 A JP 1932781A JP 1932781 A JP1932781 A JP 1932781A JP S57133026 A JPS57133026 A JP S57133026A
Authority
JP
Japan
Prior art keywords
steel pipe
polyethylene
welded steel
extruded
sheet
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
JP1932781A
Other languages
Japanese (ja)
Inventor
Kazuhiko Miura
Hirofumi Konishi
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.)
JFE Steel Corp
Original Assignee
Kawasaki Steel Corp
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 Kawasaki Steel Corp filed Critical Kawasaki Steel Corp
Priority to JP1932781A priority Critical patent/JPS57133026A/en
Publication of JPS57133026A publication Critical patent/JPS57133026A/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
    • B29C63/00—Lining or sheathing, i.e. applying preformed layers or sheathings of plastics; Apparatus therefor
    • B29C63/02—Lining or sheathing, i.e. applying preformed layers or sheathings of plastics; Apparatus therefor using sheet or web-like material
    • B29C63/04—Lining or sheathing, i.e. applying preformed layers or sheathings of plastics; Apparatus therefor using sheet or web-like material by folding, winding, bending or the like
    • B29C63/048—Lining or sheathing, i.e. applying preformed layers or sheathings of plastics; Apparatus therefor using sheet or web-like material by folding, winding, bending or the like specially adapted for articles having local protrusions, e.g. tubes having a bead weld

Abstract

PURPOSE:To definitely control the thickness of polyethylene film formed on a welded steel pipe by a method in which beads on the surface of the welded steel pipe are detected while turning the steel pipe, and by its detection signal, the amount of polyethylene sheet to be extruded is controlled. CONSTITUTION:A welded steel pipe 8 is sent axially (in the direction of arrow A) while being held and turned by skew rollers 7, and polyethylene sheet 6 in a strip state is extruded from the tip of a T die 4, pressed on the outer surface of the steel pipe 8 by a push roller 5, and then rolled spirally around the steel pipe 8. A weld bead detector 1 is provided at a place where the polyethylene sheet 6 is not yet wound, and its output end is connected to a polyethylene extruder controller 2. And, when the weld bead is high, the amount of the polyethylene sheet to be extruded is increased, but when it is low, the amount of the sheet is reduced in order to obtain a fixed thickness of polyethylene coat.
JP1932781A 1981-02-12 1981-02-12 Polyethylene coating of welded steel pipe Pending JPS57133026A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1932781A JPS57133026A (en) 1981-02-12 1981-02-12 Polyethylene coating of welded steel pipe

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1932781A JPS57133026A (en) 1981-02-12 1981-02-12 Polyethylene coating of welded steel pipe

Publications (1)

Publication Number Publication Date
JPS57133026A true JPS57133026A (en) 1982-08-17

Family

ID=11996304

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1932781A Pending JPS57133026A (en) 1981-02-12 1981-02-12 Polyethylene coating of welded steel pipe

Country Status (1)

Country Link
JP (1) JPS57133026A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0700772A1 (en) * 1994-08-04 1996-03-13 Krupp Hoesch Tecna Aktiengesellschaft Installation for externally coating pipes with longitudinally welded seam
KR100372267B1 (en) * 2000-12-01 2003-02-26 한미아 T-die extrusion type coating method for steel pipe and apparatus thereof
KR100822147B1 (en) 2007-01-26 2008-04-15 주식회사 이니텍기계 Metal tubing clothing system

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0700772A1 (en) * 1994-08-04 1996-03-13 Krupp Hoesch Tecna Aktiengesellschaft Installation for externally coating pipes with longitudinally welded seam
KR100372267B1 (en) * 2000-12-01 2003-02-26 한미아 T-die extrusion type coating method for steel pipe and apparatus thereof
KR100822147B1 (en) 2007-01-26 2008-04-15 주식회사 이니텍기계 Metal tubing clothing system

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