| 摘要 |
Two sheets of water soluble film are cemented together with a waterproof adhesive which forms a thin membrane. If either side of the laminated film is exposed to water, that side is dissolved quickly, but the membrane prevents the other side from becoming wet. The other water soluble side provides a mechanical strength, adequate to support the weight of water or other substances resting on the membrane. When the laminate is discarded into a water substance, the other side dissolves leaving only the membrane which is too weak to survive as a mechanical structure.
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