Method for manufacturing a lid for closing a container comprisin

Details Method for manufacturing a lid for closing a container comprisin Method for manufacturing a lid for closing a container comprisin

1989-03-23

1990-04-24

Dawson, Robert A.

Adhesive bonding and miscellaneous chemical manufacture

Methods

Surface bonding and/or assembly therefor

156256, 156257, 156324, 220276, 220359, B32B 3118

Patent

active

049197428

ABSTRACT:
The lid according to the invention is for closing, by thermosealing, a container having a thermoplastic material sealing zone (3) defined by an internal closed line and an external closed line, of the type comprising a closure material (5), a varnish (7) applied to one of the faces of the closure material and an added thermoplastic material layer (6) fixed separably to the closure material and covering at least a part of the varnish which is intended to face the sealing zone of the container to be closed, said lid being characterized in that the added layer (6) has a thickness of the order of 100 to 1000.mu. (10.sup.-4 to 10.sup.-3 m), its thickness being chosen so that the thermoplastic material forming it may, by locally melting during closure of the container by thermosealing, encapsulate the traces of product finding its way on to the sealing zone during filling of the container. Such a lid can be manufactured by forming in a strip of plastic material a first series of openings whose periphery corresponds substantially to the inward closed line.

REFERENCES:
patent: 3973719 (1976-08-01), Johnson et al.
patent: 4109818 (1978-08-01), Hascoe et al.
patent: 4418834 (1983-12-01), Helms et al.
patent: 4636273 (1987-01-01), Wolfersperger
patent: 4735335 (1988-04-01), Torterotot
patent: 4738374 (1988-04-01), Ingemann
patent: 4757914 (1988-07-01), Roth et al.
patent: 4801041 (1989-01-01), Takata et al.

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