POLYPROPYLENE MULTI-LAYER SEALANT FILMS FOR RETORT PACKAGING

摘要

Polypropylene multi-layer sealant films for retort packaging, each including a multi-layer film composed mainly of at least one polypropylene polymer and to be laminated on one surface of a heat-resisting film, the multi-layer film having a first surface facing the heat-resisting film when laminated therewith and further having a second surface on the other side, the first surface having a surface roughness as defined below in (1), and the second surface having a surface roughness as defined below in (2):(1)(i) center-line mean roughness (Ra): 0.020 to 0.250 mum;(ii) maximum height (Rmax): 0.3 to 2.9 mum; and(iii) ten-point mean roughness (Rz): 0.2 to 2.4 mum;(2)(i) center-line mean roughness (Ra): 0.050 to 0.300 mum;(ii) maximum height (Rmax): 3.0 to 13.0 mum; and(iii) ten-point mean roughness (Rz): 2.5 to 11.5 mum.