JPS54119578A - Foaming heat-expandable tube and its production - Google Patents

Foaming heat-expandable tube and its production

Info

Publication number
JPS54119578A
JPS54119578A JP2747978A JP2747978A JPS54119578A JP S54119578 A JPS54119578 A JP S54119578A JP 2747978 A JP2747978 A JP 2747978A JP 2747978 A JP2747978 A JP 2747978A JP S54119578 A JPS54119578 A JP S54119578A
Authority
JP
Japan
Prior art keywords
tube
foaming
diameter
holes
production
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.)
Granted
Application number
JP2747978A
Other languages
Japanese (ja)
Other versions
JPS5645371B2 (en
Inventor
Takashi Tominaga
Tadahiro Rokushiya
Hideshi Asoshina
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.)
Nitto Denko Corp
Original Assignee
Nitto Electric Industrial 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 Nitto Electric Industrial Co Ltd filed Critical Nitto Electric Industrial Co Ltd
Priority to JP2747978A priority Critical patent/JPS54119578A/en
Publication of JPS54119578A publication Critical patent/JPS54119578A/en
Publication of JPS5645371B2 publication Critical patent/JPS5645371B2/ja
Granted 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
    • B29C61/00—Shaping by liberation of internal stresses; Making preforms having internal stresses; Apparatus therefor
    • B29C61/003—Shaping by liberation of internal stresses; Making preforms having internal stresses; Apparatus therefor characterised by the choice of material
    • 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
    • B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
    • B29K2105/04—Condition, form or state of moulded material or of the material to be shaped cellular or porous

Landscapes

  • Thermal Insulation (AREA)
  • Rigid Pipes And Flexible Pipes (AREA)
  • Shaping Of Tube Ends By Bending Or Straightening (AREA)
  • Shaping By String And By Release Of Stress In Plastics And The Like (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)

Abstract

PURPOSE:After a foaming tube of thermoplastic material is shrinked in diameter by drawing, a number of through-holes that can be blocked by heat foaming are bored on the tube wall, thereby producing a tube that can closely cover the inner surface of a pipe without leaving bubbles when expanded up to the inner surface. CONSTITUTION:A thermoplastic tube containing a foaming agent is shrinked in diameter by drawing in the lengthwise direction with heating until it is softened. Then a number of through holes that can be blocked by heat foaming, preferably holes are 0.1-1 mm in diameter and the number is 20-200/100 cm<2>, are bored on the tube wall. EFFECT:The pipes coated with sail tubes have no projecting parts caused by bubbles remaining between the film and the wall and cause no irregular flows when used to transport powders because of their smoothe surface.
JP2747978A 1978-03-09 1978-03-09 Foaming heat-expandable tube and its production Granted JPS54119578A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2747978A JPS54119578A (en) 1978-03-09 1978-03-09 Foaming heat-expandable tube and its production

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2747978A JPS54119578A (en) 1978-03-09 1978-03-09 Foaming heat-expandable tube and its production

Publications (2)

Publication Number Publication Date
JPS54119578A true JPS54119578A (en) 1979-09-17
JPS5645371B2 JPS5645371B2 (en) 1981-10-26

Family

ID=12222249

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2747978A Granted JPS54119578A (en) 1978-03-09 1978-03-09 Foaming heat-expandable tube and its production

Country Status (1)

Country Link
JP (1) JPS54119578A (en)

Also Published As

Publication number Publication date
JPS5645371B2 (en) 1981-10-26

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