MEHRSCHICHTIGES VERPACKUNGSMATERIAL, VERFAHREN ZU DESSEN HERSTELLUNG, SOWIE AUS DIESEM MATERIAL HERGESTELLTER VERPACKUNGSBEHÄLTER

摘要

PCT No. PCT/SE96/01320 Sec. 371 Date Apr. 14, 1998 Sec. 102(e) Date Apr. 14, 1998 PCT Filed Oct. 17, 1996 PCT Pub. No. WO97/14629 PCT Pub. Date Apr. 24, 1997The disclosure relates to a laminated packaging material (10) comprising a core layer (11) of paper or paperboard and a layer (12) of polyvinyl alcohol serving as oxygen gas barrier on one side of the core layer. In order to avoid excessively large quantities of polyvinyl alcohol on application of the oxygen gas barrier layer (12), a layer (13) is applied which serves as a binder and consists of a mixture of polyvinyl alcohol and a gel-forming substance, for example agar, between the polyvinyl alcohol layer (12) and the core layer (11), with the aid of which excessive penetration of polyvinyl A alcohol into the core layer (11) is effectively counteracted, at the same time as the applied binder layer (13) smoothes and evens out the coarse surface structure of the core layer (11) and forms a smooth substrate for the polyvinyl alcohol layer (12). The quantity of gel-forming substance in the binder layer (13) may amount to between 1 and 20 per cent of the total weight of the mixture.