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AU487687B2 - A process and device forthe manufacture of double-walled plastics pipes with their external wall provided with annular or helical grooves - Google Patents

A process and device forthe manufacture of double-walled plastics pipes with their external wall provided with annular or helical grooves

Info

Publication number
AU487687B2
AU487687B2 AU79436/75A AU7943675A AU487687B2 AU 487687 B2 AU487687 B2 AU 487687B2 AU 79436/75 A AU79436/75 A AU 79436/75A AU 7943675 A AU7943675 A AU 7943675A AU 487687 B2 AU487687 B2 AU 487687B2
Authority
AU
Australia
Prior art keywords
annular
double
external wall
wall provided
helical grooves
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.)
Expired
Application number
AU79436/75A
Other versions
AU7943675A (en
Inventor
Hegler And Ralph Peter Hegler Wilhelm
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.)
Individual
Original Assignee
Individual
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
Priority claimed from DE2413878A external-priority patent/DE2413878C3/en
Priority claimed from DE2413879A external-priority patent/DE2413879C3/en
Application filed by Individual filed Critical Individual
Application granted granted Critical
Publication of AU7943675A publication Critical patent/AU7943675A/en
Publication of AU487687B2 publication Critical patent/AU487687B2/en
Expired legal-status Critical Current

Links

AU79436/75A 1974-03-22 1975-03-24 A process and device forthe manufacture of double-walled plastics pipes with their external wall provided with annular or helical grooves Expired AU487687B2 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE2413878A DE2413878C3 (en) 1974-03-22 1974-03-22 Process for producing a double-walled plastic pipe with a corrugated outer wall and a smooth inner wall and a device for carrying out this process
DE2413879A DE2413879C3 (en) 1974-03-22 1974-03-22 Device for the production of a double-walled plastic pipe from a corrugated outer pipe and a smooth inner pipe
DEDE824138 1974-03-22

Publications (2)

Publication Number Publication Date
AU7943675A AU7943675A (en) 1976-09-30
AU487687B2 true AU487687B2 (en) 1976-09-30

Family

ID=

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