US 4,731,171 AGranted

Process for making a lid having a tear-away opening

AssigneeSchmalbach-Lubeca AG

InventorGeorg Bolte

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Abstract

The process and apparatus of the invention provide a coat of lacquer or varnish covering a tear-off cover, which is formed from a thin ferromagnetic metal, has a circumferential supporting lip and is equipped with a tear-off opening made by scoring and/or punching in or out the cover surface. To provide the coat of lacquer or varnish the cover is moved through an electric coating tank, a washing tank and drying zone with the plane of the cover oriented substantially vertically while being supported exclusively on the surface of the inner wall of the supporting lip. The entire surface of the cover is completely covered by the lacquer or varnish coating except for a small portion on the inner wall of the supporting lip which is positioned inside the closed container in a folded seam and/or covered by a sealing material.

Claims1

Dependent claims

A method of coating a container cover of ferromagnetic material having a turned rim with an anticorrosive lacquer, comprising the steps of:

engaging said cover and holding said cover vertically on a holder having three generally horizontal pins extending into said rim and contacting said cover only within said rim;
transporting said holder with said cover engaged thereon along a transport path;
retaining said cover on said pins by maintaining said holder in a predetermined space relationship alongside a magnetic rail extending along the length of said transport path whereby a magnetic field from said rail attracts said cover onto said pins;
providing a bath of said lacquer along said path so that while said cover is maintained vertical, it is displaced through said immersed in said bath;
and
electrophoretically depositing said lacquer from said bath on said cover while it is immersed in said bath.

3 more elements

Dependencies are inferred from the claim text.