B - Operations – Transporting – 65 – D
Patent
B - Operations, Transporting
65
D
217/7
B65D 81/00 (2006.01) B26F 1/31 (2006.01) B65D 33/01 (2006.01)
Patent
CA 1250255
Abstract A plastic bag of polyolefin material such as polyethylene, for packaging materials, comprising particles of less than 50 µm, and a closed bag containing such materials and a foil material for such a bag. The foil wall of the bag is provided with venting apertures with smooth edges, obtained by laser radiation, having a smallest size of 50-100 µm; the distance between the venting perforations is such that the tensile strength of the foil is substantially the same as the tensile strength of the similar non-perforated foil. In a low density polyethylene foil of a thickness of 130-190 µm the distance between the perforations of 80 µm is more than 20 mm, in a linear low density polyethylene foil of about 50-110 µm the perforation distance is at least 5 mm. The bag may consist of two perforated foil layers, the perforations being staggered with respect to each other.
474897
Gowling Lafleur Henderson Llp
Wavin B.v.
LandOfFree
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