| 摘要 |
<p>A container has a layer structure, comprises at least two compatible layers, integrally bonded together, one layer being formed of a substantially rigid plastic material, to allow said layer structure to be used or formed according to mechanical properties of said one layer. The other layer is formed of a substantially flexible plastic material to allow said layer structure to keep tightness properties of said flexible plastic material when being used or formed according to said properties of said one layer. This layer structure fulfils the three following conditions: a) to maintain a shape into which it is brought, b) to allow for frequent change of this shape and c) to maintain tightness even on frequent changements of that shape. </p> |
