HERMETICALLY CLOSED CONTAINER AND PROCESS FOR ITS MANUFACTURE

摘要

Disclosed is a hermetically closed container for packaging humidity sensitive solid food products, comprising a tube-shaped body made of a composite material comprising an outer coating, at least one outer cardboard layer, an oxygen barrier layer covering the cardboard layer on the inside, and an inner, heat-sealable coating of a thermoplastic material; a closure in the form of a sealed tear-off membrane comprising an oxygen barrier layer and an inner coating of a thermoplastic heat-sealable material; and a deep-drawn bottom made of a composite material comprising an outer varnish layer, at least one cardboard layer, an oxygen barrier layer covering the cardboard layer on the inside, and an inner coating of a heat-sealable thermoplastic material, the bottom with its rim being drawn upwards and outwards over the end face of the body and heat-sealed to the inside and the outside of said body, characterized in that the composite material of said bottom has a laminate structure comprising from the outside to the inside: a heat-resistant outer varnish layer providing the coated cardboard surface with a coefficient of friction determined with an Instron apparatus according to the ASTM method D 1894-00 of between about 0.10 and 0.45, preferably between about 0.20 and 0.30, at least one cardboard layer, an oxygen barrier layer, an abuse resistant reinforcing carrier layer for the barrier layer between the cardboard layer and the oxygen barrier layer, and an inner heat-sealable coating of a thermoplastic material and a process for its manufacture.