Method for making and converting a centerfolded film

Details Method for making and converting a centerfolded film Method for making and converting a centerfolded film

1998-01-20

2000-05-16

Ball, Michael W.

Adhesive bonding and miscellaneous chemical manufacture

Methods

Surface bonding and/or assembly therefor

156218, 156271, B29C 5304

Patent

active

060632216

ABSTRACT:
A method includes the steps of providing a tubing having an inner annular layer comprising a crosslinked polymeric material, and an outer annular layer comprising a non-crosslinked polymeric material, or a material that is crosslinked to a lesser extent than the material of the inner layer; longitudinally slitting the tubing to form a folded film; and reverse centerfolding the folded film to provide a folded film having a lateral slit edge, and a lateral folded edge opposite said lateral slit edge, such that the inner annular layer becomes an outer layer, and the outer annular layer becomes an inner layer. A bag can be made from the reverse centerfolded film, and an article such as food can be packaged in the bag.

REFERENCES:
patent: 3741253 (1973-06-01), Brax et al.
patent: 4064296 (1977-12-01), Bornstein et al.
patent: 4724176 (1988-02-01), Sun
patent: 4863768 (1989-09-01), Ishio et al.
patent: 5055328 (1991-10-01), Evert et al.

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