Method and apparatus for forming a double walled...

Details Method and apparatus for forming a double walled... Method and apparatus for forming a double walled...

B - Operations, Transporting

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B29C 49/38 (2006.01) B26F 1/00 (2006.01) B29C 47/00 (2006.01) B29C 47/06 (2006.01) B29C 49/00 (2006.01) B29C 49/22 (2006.01)

Patent

CA 1187258

ABSTRACT OF THE DISCLOSURE Double-Walled Thermoplastic tubes, with corrugat- ed outer walls and smooth inner wall are formed with in- tegral bell sections spaced along the tube. The outer, corrugated wall is formed with a bell section. One of the walls is pierced between the ends of the bell section to allow the escape of air, and the inner wall is pressed outwards into engagement with the bell section of the outer wall.

416840

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