Patent ID: 6860952

Claim:
A method for forming a thermoplastic film having a closure, the method comprising the steps of: (a) providing a thermoplastic film web having a sealing surface, the temperature of the film web being below a melting temperature of the film web; (b) providing a thermoplastic closure having male and female closure strips that are not interlocked, wherein one of the closure strips includes a binding surface, the temperature of the one closure strip being below a melting temperature of the one closure strip; (c) extruding a thermoplastic binder layer; (d) positioning the film web and the one closure strip such that the film web and the one closure strip are not in overlapping relationship; (e) positioning the binder layer on the scaling surface of the film web and on the binding surface of the one closure strip while the male and female closure strips are not interlocked such that the binder layer contacts the sealing surface of the film web before the binder layer has cooled to a temperature below the melting temperature of the film web and the binder layer contacts the binding surface of the one closure strip before the binder layer has cooled to a temperature below the melting temperature of the one closure strip; and (f) thereafter applying pressure to the binder layer so as to bind the one closure strip and film web to the binder layer.