CONTAINERS MADE BY THE CO-EXTRUSION BLOWING PROCESS

摘要

The invention relates to a self-supporting hollow body of thermoplastic material produced by the co-extrusion blowing process, the wall of which consist of a laminate and contains at least two barrier layers of such a thickness that the blocking action of each individual barrier layer does not meet the requirements, but the entire set of barrier layers does provide a sufficient blocking effect. The distribution of the barrier material over several layers ensures that the latter are less brittle than if all the barrier material needed to achieve the desired blocking effect were concentrated in only one layer. In self-supporting, rigid hollow bodies produced in this way, mechanical stresses which result in marked elastic deformations of the container do not adversely affect its blocking action by damaging the barrier layers.