PELLICOLA POLIMERICA GOFFRATA ALLO STATO FUSO STIRABILE PER TRASORMAZIONE IN RETE E PROCEDEIMENTO EPR LA SUA FABBRICAZIONE

摘要

1496786 Perforated plastic sheets SMITH & NEPHEW RESEARCH Ltd 19 June 1975 [19 June 1974] 27218/74 Headings B5A and B5B Net-like plastics material is formed by grooving a sheet on both sides to form two sets of parallel ribs so that at the crossover points of the grooves the sheet is reduced to a thin membrane which ruptures when the sheet is biaxially stretched. In order to produce orientation through the rib sections on stretching and thus ensure greater tensile strength the ratio between the area of the intersection common to two ribs of sets Ia and the cross-sectional area of either rib II is not greater than 2 : 1.