JPS5637143A - Partial covering method of metal tube - Google Patents

Partial covering method of metal tube

Info

Publication number
JPS5637143A
JPS5637143A JP11166879A JP11166879A JPS5637143A JP S5637143 A JPS5637143 A JP S5637143A JP 11166879 A JP11166879 A JP 11166879A JP 11166879 A JP11166879 A JP 11166879A JP S5637143 A JPS5637143 A JP S5637143A
Authority
JP
Japan
Prior art keywords
cover
dummy
polyethylene
pipe
tubing die
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
JP11166879A
Other languages
Japanese (ja)
Inventor
Hitoshi Arai
Ryoji Saito
Yoshiyuki Morioka
Koichi Kaida
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 Engineering Corp
Original Assignee
NKK Corp
Nippon Kokan 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 NKK Corp, Nippon Kokan Ltd filed Critical NKK Corp
Priority to JP11166879A priority Critical patent/JPS5637143A/en
Publication of JPS5637143A publication Critical patent/JPS5637143A/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
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/15—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor incorporating preformed parts or layers, e.g. extrusion moulding around inserts
    • B29C48/151—Coating hollow articles
    • 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
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B29C48/09—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2009/00—Layered products

Landscapes

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

Abstract

PURPOSE:To reduce a production time and to improve efficiency, by previously applying a dummy cover using a tubing die onto a portion where a cover is not required. CONSTITUTION:First, a full length of a steel pipe is covered with a dummy polyethylene cover having a thickness of 0.3mm. using a tubing die, and then the dummy polyethlene cover is stripped off with an intermediate portion of 1m where the cover is not required being left. The pipe is then subjected to extrusion covering using a double tubing die with an asphalt adhesive extruded inside and a polyethylene outside to cover the pipe with the two layers. Finally, the left dummy polyethylene cover on the portion where a cover is not required is stripped off together with the asphalt adhesive and outer polyethylene layers on the dummy cover to obtain a covered 600A steel pipe having a length of 15m with a 1m intermediate portion thereof uncovered.
JP11166879A 1979-09-03 1979-09-03 Partial covering method of metal tube Pending JPS5637143A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP11166879A JPS5637143A (en) 1979-09-03 1979-09-03 Partial covering method of metal tube

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11166879A JPS5637143A (en) 1979-09-03 1979-09-03 Partial covering method of metal tube

Publications (1)

Publication Number Publication Date
JPS5637143A true JPS5637143A (en) 1981-04-10

Family

ID=14567145

Family Applications (1)

Application Number Title Priority Date Filing Date
JP11166879A Pending JPS5637143A (en) 1979-09-03 1979-09-03 Partial covering method of metal tube

Country Status (1)

Country Link
JP (1) JPS5637143A (en)

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