Efrain A Davila

US Patent:

41793250, Dec 18, 1979

Filed:

Jun 5, 1978

Appl. No.:

5/912831

Inventors:

Henry N. Staats - Deerfield IL
Waldemar M. Schmidt - Niles IL
Efrain A. Davila - Chicago IL

Assignee:

General Binding Corporation - Northbrook IL

International Classification:

B05C 102
B05C 104
B42C 900

US Classification:

156498

Abstract:

Apparatus and method for the manufacture of adhesive covers in which cover material is conveyed through an apparatus wherein a hot melt adhesive is applied to selected portions of the cover material, a release agent is applied to the adhesive and the adhesive on the cover material is cooled. The apparatus includes a novel hot melt adhesive applicator which is adapted to break the string of adhesive stretching from the hot melt bead on the cover to the applicator nozzle. One embodiment of the unit involves an in-line arrangement in which individual covers are processed. Another embodiment involves an in-line arrangement in which web of cover material flows continuously through various operations and is then cut at the end into individual covers. Another embodiment involves an in-line arrangement in which a web of transparent cover material is incorporated in the process and combined with a web of cover material overlapping a portion of the latter.