Process and sealing material for producing the lid gasket of syn

Details Process and sealing material for producing the lid gasket of syn Process and sealing material for producing the lid gasket of syn

1992-03-16

1993-07-06

Kuhns, Allan R.

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

Composite article making

264 464, 264 69, 264 80, 264102, 264268, 264300, B29C 6722

Patent

active

052251250

ABSTRACT:
A lid (1) is injection-molded of polyethylene, for a widemouthed barrel of a synthetic resin, and includes an outer rim (4) encompassing the barrel neck (3) and an inner rim (5) dipping into the barrel neck. The outer lid rim (4) and inner lid rim (5) form an annular space (7), an annular web (8) projecting axially from the base of this space. For producing the lid gasket (13), the annular space (7) is exposed to an open flame for activating the annular space surface. Subsequently the sealing material, preferably polyurethane, is injected from a foaming machine into the base of the annular space (7), and thereafter the lid (1) is vibrated in order to degasify the gasket (13). The sealing material, preferably consisting of foamed polyurethane, contains a parting compound having a long-term effect.

REFERENCES:
patent: 2566596 (1951-09-01), Cantor
patent: 3052926 (1962-09-01), Quinche et al.
patent: 3557030 (1971-01-01), Simons
patent: 4060439 (1977-11-01), Rosemund et al.
patent: 4130213 (1978-12-01), Wszolek
patent: 4324601 (1982-04-01), Dembicki et al.
patent: 4473673 (1984-09-01), Williams et al.
patent: 4567106 (1986-01-01), Sano et al.
patent: 4756857 (1988-07-01), Dezio et al.
patent: 4988467 (1991-01-01), Holdsworth et al.

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