Method and apparatus for joining tubular plastic parts by weldin

Details Method and apparatus for joining tubular plastic parts by weldin Method and apparatus for joining tubular plastic parts by weldin

1989-08-15

1991-08-06

Wityshyn, Michael G.

Adhesive bonding and miscellaneous chemical manufacture

Surface bonding means and/or assembly means therefor

Means joining flexible indefinite length or endless bodies...

156158, 1563042, 1563046, 156502, 1565834, 219535, B29C 6530

Patent

active

050375008

ABSTRACT:
A heating arrangement (2) embracing tubular parts (1a, 1b) of plastic material which have to be joined by welding, comprises electrically heatable jaws (26).
A bladder (50) expandable by compressed air is arranged inside the tubular parts (1a, b), which includes a centrally arranged tensile part (56) such as, for instance, cable for the purpose of limiting the length. The air pressure in the bladder is higher than the pressure generated by the material when melting, this for the purpose of producing an adequate welding pressure.

REFERENCES:
patent: 2763910 (1956-09-01), Braatelien
patent: 3022209 (1962-02-01), Campbell
patent: 4792374 (1988-12-01), Rianda
patent: 4801349 (1989-01-01), Dommer et al.

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