Patent ID: 9302453
Filing Date: 2016-04-05
CPC Classification: B26F,B29C,B29L,B31B,B31F,B32B,Y10T

Claim Text:
1. A composite film ( 10 ), having at least one sealing layer ( 12 ), which consists of sealable material and is connected, at least indirectly, to a first layer ( 11 ) which acts as an outer layer, wherein the sealing layer ( 12 ) has a lower melting point than the first layer ( 11 ), wherein on that side of the sealing layer ( 12 ) which is directed away from the first layer ( 11 ), a second layer ( 13 ), which acts as an inner layer, is arranged in operative connection with said sealing layer ( 12 ), in that the second layer ( 13 ) has a higher melting point than said sealing layer ( 12 ), wherein a plurality of through-openings ( 17 ; 17 a to 17 c ) is configured in the second layer ( 13 ), the through-openings being arranged evenly spaced in relation to each other, wherein at least two rows of through-openings ( 17 , 17 a to 17 c ) are provided, in that a strip-like zone ( 19 ) without any through-openings ( 17 ; 17 a to 17 c ) is formed between the rows, the composite film ( 10 ) forming a folding edge such that the through-openings ( 17 ; 17 a to 17 c ) of the second layer ( 13 ) laid against each other are arranged relative to one another in an overlapping manner and aligned, and wherein said second layer ( 13 ) has at least one through-opening ( 17 ; 17 a to 17 c ) which is covered over by said sealing layer ( 12 ).