Method and apparatus for forming a double walled thermoplastic t

Details Method and apparatus for forming a double walled thermoplastic t Method and apparatus for forming a double walled thermoplastic t

1983-11-03

1985-08-13

Silbaugh, Jan

Plastic and nonmetallic article shaping or treating: processes

With severing, removing material from preform mechanically,...

Making hole or aperture in article

138121, 138122, 138148, 264508, 264167, 264173, 425503, 425505, 4251331, 425523, 425532, 425290, B29C 1707, B29C 1714, B29D 2304

Patent

active

045349231

ABSTRACT:
Double walled thermoplastic tubes, with corrugated outer walls and smooth inner wall are formed with integral 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.

REFERENCES:
patent: 2898941 (1959-08-01), Kilcup
patent: 3286305 (1966-11-01), Seckel
patent: 3743457 (1973-07-01), Cini
patent: 3859025 (1975-01-01), Maroschak
patent: 3897090 (1975-07-01), Maroschak
patent: 4305703 (1981-12-01), Lupke et al.
patent: 4428591 (1984-01-01), Marissen et al.

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