FI964230A - Method of bending double-walled thermoplastic tubes - Google Patents

Method of bending double-walled thermoplastic tubes Download PDF

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Publication number
FI964230A
FI964230A FI964230A FI964230A FI964230A FI 964230 A FI964230 A FI 964230A FI 964230 A FI964230 A FI 964230A FI 964230 A FI964230 A FI 964230A FI 964230 A FI964230 A FI 964230A
Authority
FI
Finland
Prior art keywords
pipe
thermoplastic material
air spaces
wall
longitudinal section
Prior art date
Application number
FI964230A
Other languages
Finnish (fi)
Swedish (sv)
Other versions
FI964230A0 (en
FI103566B (en
FI103566B1 (en
Inventor
Seppo Takala
Original Assignee
Kwh Pipe Ab Oy
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 Kwh Pipe Ab Oy filed Critical Kwh Pipe Ab Oy
Priority to FI964230A priority Critical patent/FI103566B1/en
Publication of FI964230A0 publication Critical patent/FI964230A0/en
Publication of FI964230A publication Critical patent/FI964230A/en
Application granted granted Critical
Publication of FI103566B publication Critical patent/FI103566B/en
Publication of FI103566B1 publication Critical patent/FI103566B1/en

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  • Shaping Of Tube Ends By Bending Or Straightening (AREA)

Abstract

The invention relates to a method for bending a double- walled thermoplastic pipe having evenly distributed peripheral air spaces 3 situated between the walls 1, 2. The method is characterised by the following stages: incorporation of evacuation openings to air spaces 3 of the plastic pipe along a longitudinal section L of the pipe, in as much as the said air spaces 3 are entirely closed, heating up of the thermoplastic material in at least one wall 1, 2 of the double-wall plastic pipe on the said longitudinal section L within a part that covers approximately 50 to 75% of the periphery of the pipe, to a temperature in excess of the crystalline melting point of the thermoplastic material, in order to soften the thermoplastic material in the said part, application of a vacuum in all air spaces 3 within the heated longitudinal section L, the softened thermoplastic material being sucked into the said air spaces 3 and the production of a shortening of the pipe wall on the heated side of the pipe with a natural bending of the pipe as a result, and cooling of the thermoplastic material in the pipe wall 1, 2 after achieving the desired bending angle. <IMAGE>
FI964230A 1996-10-21 1996-10-21 Method for bending double-walled thermoplastic pipes FI103566B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FI964230A FI103566B1 (en) 1996-10-21 1996-10-21 Method for bending double-walled thermoplastic pipes

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI964230A FI103566B1 (en) 1996-10-21 1996-10-21 Method for bending double-walled thermoplastic pipes
FI964230 1996-10-21

Publications (4)

Publication Number Publication Date
FI964230A0 FI964230A0 (en) 1996-10-21
FI964230A true FI964230A (en) 1998-04-22
FI103566B FI103566B (en) 1999-07-30
FI103566B1 FI103566B1 (en) 1999-07-30

Family

ID=8546911

Family Applications (1)

Application Number Title Priority Date Filing Date
FI964230A FI103566B1 (en) 1996-10-21 1996-10-21 Method for bending double-walled thermoplastic pipes

Country Status (1)

Country Link
FI (1) FI103566B1 (en)

Also Published As

Publication number Publication date
FI964230A0 (en) 1996-10-21
FI103566B (en) 1999-07-30
FI103566B1 (en) 1999-07-30

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Legal Events

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MA Patent expired