US 5,041,072 AGranted

Method of making flapped envelope with peel-off strip for band of pressure-sensitive adhesive

AssigneeCyril-Scott Company

InventorE. Leslie McClelland

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Abstract

In making the product, the manufacturer coats a longitudinal band of a web with a release coating. A longitudinal pressure-sensitive adhesive strip is applied in a longitudinal band on the web. Transverse glue lines are provided and the web is longitudinally folded, bringing two portions of the web into face-to-face contact. As a result, the transverse glue lines define individual envelope pockets and the release-coated surface on the first web portion becomes applied to the longitudinal adhesive strip on the second web portion. At the same time, the release-coated band of the first web portion is longitudinally severed from the remainder of the first web portion, thereby creating a separate peel-off strip removably covering the band of pressure-sensitive adhesive. The peel-off strip is manufactured while the envelope is being manufactured, and out of the same paper or paper-like material. The manufacturer can print, e.g. in multi-colors, on the portion of the web that becomes the peel-off strip, so that it can bear more attractive, more imaginative graphics, and registration of the peel-off strip on the web is a automatic task.

Claims8

Dependent claims

A method for making a plurality of individual flapped envelopes, each with a manufactured-in-line peel-off strip for a band of pressure-sensitive adhesive, comprising:

(a) providing a web of flexible sheet material of indeterminate length, said web having two opposite faces and two laterally opposite edges, a longitudinal direction and a transverse direction;
(b) coating onto one face of said web, a longitudinal strip of release coating material and drying or curing said coating to provide a release coating strip;
(c) coating onto one of a non-release coated region of said one face of said web and said release coating strip, a longitudinal band of pressure-sensitive adhesive;
(d) folding said web longitudinally thereof along a longitudinal fold line so arranged as to cause said band of pressure-sensitive adhesive to become both removably covered by said longitudinal strip of release coating material and preferentially adhered to said one face of said web in said non-release coated region;
(e) longitudinally slitting said web between said release coating strip and said longitudinal fold line, along a longitudinal slit line, to provide a peel-off strip releasably covering said band of pressure-sensitive adhesive;
(f) cutting said web crosswise into a succession of separate elements, each having a left edge and a right edge;
and
(g) connecting plies of each said element together along respective left and right edges thereof, from said longitudinal fold line to said longitudinal slit line to create in each said element a pocket open along said longitudinal slit line.

5 more elements

Dependencies are inferred from the claim text.