Stock material or miscellaneous articles – Hollow or container type article – Paper containing
Patent
1988-11-30
1991-02-19
Herbert, Thomas J.
Stock material or miscellaneous articles
Hollow or container type article
Paper containing
427404, 427411, 428 359, 4284763, 4284796, B65D 100, B32B 1508
Patent
active
049943103
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 (2) of paper or cardboard and a gas-tight, thin metal foil (5) 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 foils protecting against gas which are sensitive to tension, thus entailing the risk of the intended gas barrier characteristics of the packing container being impaired or wholly lost. To counteract this risk the packing laminate is provided with a layer (6) of ethylvinyl alcohol laminated between the metal foil (5) and the carrier layer (2) 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 (5) is lost during the manufacture of the container. Preferably the laminate is provided also with a further layer (7) of a material permeable to moisture which is laminated between the ethylvinyl alcohol layer (6) and the carrier layer (2) and which is adapted to let through moisture which from the liquid-filled inside of the container might be able to penetrate into the ethylvinyl alcohol layer (5) through such crack formations in the metal foil (5). As a result the moisture content in the ethylvinyl alcohol layer (6) can be kept at a sufficiently low level so as not to have a negative effect on the gas barrier characteristics of the ethylvinyl alcohol layer (6) which otherwise diminish with increasing moisture content.
REFERENCES:
patent: 3574668 (1971-04-01), Cherney
patent: 4095013 (1978-06-01), Burger
patent: 4533576 (1985-08-01), Tanahashi et al.
patent: 4614208 (1986-09-01), Skarelius
patent: 4753832 (1988-06-01), Brown et al.
Frisk Peter
Lofgren Lars
Herbert Thomas J.
Roby Teknik Aktiebolag
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