APPARATUS FOR LAMINATING THERMOPLASTIC FILM MATERIALS

摘要

A laminate of thermoplastic film materials exhibiting throughgoing porosity and comprising plies A and B, A having an inner surface A1 partly in contact with B and an outer surface A2, and B having an inner surface BI partly in contact with A and an outer surface B2, A and B consisting of continuous material except for a multitude of perforations in each ply, whereby essentially no perforation in A corresponds directly to a perforation in B, the lamination between A and B on surfaces A1 and B1 being a) through a coextruded lower melting lamination layer on A and/or B and b) established in such discontinuous manner that there is formed a channel system between A1 and B1 connecting the majority of the perforations in A each with at least one of the perforations in B, and connecting the majority of the perforations in B each with at least one of the perforations in A is provided in addition to a process and apparatus for producing such a laminate.

主权项

1. A laminate of thermoplastics material comprising:
plies A and B, a lamination between the plies A and B on the surfaces A1 and B1 being through a coextruded lower melting lamination layer on the ply A and/or the ply B, where the ply A is fluted with flutes which extend linearly in a longitudinal or a transverse direction, with a basis of the flutes bonded to a substantially flat ply B, a wavelength of the flutes being about 3 mm or less and a height of the flutes being about 0.3 mm or more and the ply B exhibits a pattern of linear, segmentally stretched receding portions separated by linear bosses extending under an angle to the direction of the flutes.