STOCK ROLLS CONTAINING A FIRST FOLDED FILM WITHIN A SECOND FOLDED FILM AND METHODS OF MAKING THE SAME

摘要

Methods for forming a stock roll including a folded film within another folded film include combining the films and winding them into the stock roll. In particular, one or more implementations of a method of forming a stock roll involve combining films on an extrusion tower. Thus, implementations of the present invention can greatly reduce costs and space requirements, while allowing a single stock roll to feed a bag-making machine in order to produce bag-in-bag structures. One or more implementations further include stock rolls including a first folded film within another folded film.

主权项

1. A method for forming a stock roll including a folded film inserted within a another folded film, the method comprising:
slitting a thermoplastic tube to form a first continuous thermoplastic film and at least a second continuous thermoplastic film; folding one or more of the first continuous thermoplastic film and the at least a second continuous thermoplastic film to form a multi-layer composite folded film comprising an inner folded layer and an outer folded layer folded about the inner folded layer; and winding the multi-layer composite folded film about a tube roll.