B - Operations – Transporting – 32 – B
Patent
B - Operations, Transporting
32
B
117/114.6
B32B 15/08 (2006.01) B32B 27/08 (2006.01) B65D 65/40 (2006.01)
Patent
CA 1316777
ABSTRACT In the manufacture of packing containers by means of folding of laminate in the form of sheets or of a web of the type which comprises a relatively thick carrier layer of paper or cardboard and a gas-tight, thin metal foil the laminate is subjected to stresses which, particularly within folding regions comprising multiple material thicknesses, may be so strong that crack formations occur in the metal falls protecting against gas which are senstive to tension, thus entailing the risk of the intended gas barrier characteristica of the packing container being impaired or wholly lost. To counteract this risk the packing laminate is provided with a layer of ethylvinyl alcohol laminated between the metal foil and the carrier layer which for one thing is mechanically sufficiently durable to withstand the external stresses during the folding of the laminate, and for another has sufficiently good gas barrier properties to compensate for the loss in gas tightness which thus may arise if the integrity of the metal foil is lost during the manufacture of the container. Preferably the laminate is provided also with a further layer of a material permeable to moisture which is laminated between the ethylvinyl alcohol layer and the carrier layer and which is adapted to let through moisture whihc from the liquld-filled inside of the container might be able to penetrate into the ethylvinyl alcohol layer through such crack formations in the metal foil . As a result the moisture content in the ethylvinyl alcohol layer can be kept at a sufficiently low level so as not to have a negative effect on the gas barrier characteristics of the ethylvinylalcohol layer which otherwise diminish with increasing moisture content.
584554
Frisk Peter
Lofgren Lars
Marks & Clerk
Roby Teknik Aktiebolag
LandOfFree
Flexible packing laminate in the form of sheets or of a web,... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Flexible packing laminate in the form of sheets or of a web,..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Flexible packing laminate in the form of sheets or of a web,... will most certainly appreciate the feedback.
Profile ID: LFCA-PAI-O-1240778