Methods for making a film material exhibiting textile properties

摘要

A film material formed of thermoplastic polymer material is processed so as to have linearly extending regions (A) linked together by linearly extending webs (B), regions (A) and webs (B) each being oriented, the dominant direction of orientation in regions (A) forming an angle (V) to the direction on which (A) extends and webs (B) comprising arrays of linear furrows of thinner material or splits forming angles (U) higher than (V) to the direction in which (A) extends. The method of producing the new film involves passing an orientated film through a pair of intermeshing grooved rollers to cold-stretch the film in a direction at an angle to the predominant original orientation, at least one of the grooved rollers having crests with sharp edges to form the division between regions A and webs B and to stretch the material to form webs B while stretching the material less or not at all to form regions A. Preferably at least one of the grooved rollers has crests with a waved surface shape.

主权项

1. A method of producing a stretched film comprising thermoplastic polymer material comprising:
obtaining a film or an assembly of films, where each film has a predominate direction of orientation, and stretching the film or the assembly of films through a pair of mutually intermeshing first grooved rollers in a direction different from each predominant direction of orientation, where the direction is at the highest 80° different from any of the predominant directions of orientation, where each crest of each of the first grooved rollers has edges sufficiently sharp to form a distinct division between each parallel, linear extending web (B) coldstretched between the crests of the first grooved rollers and each intervening linearly extending unstretched or minimally stretched band-shaped region (A), which laid on the crests of the first grooved rollers and where more than 50% of a thickness change of the distinct divisions occurs within a zone no wider than 15% of a width of each of the regions (A).