| 摘要 |
PROBLEM TO BE SOLVED: To provide a mat for placing on a sand-like substance. SOLUTION: When the mat 1 is placed on sand 5 with a first layer 2 downwards, any sand that passes upwards through the lower surface of the first layer 2 is retained between the first layer 2 and a second layer 3. Any sand that falls on the upper surface of the second layer 3 and passes therethrough is also retained between the first layer 2 and second layer 3. Optionally, a third layer 7 manufactured from a polyvinylchloride-coated nylon mesh material can be positioned over the second layer 3 and the perimeters of first, second, third layers 2, 3 are secured together with overlapping tape 4. The upper surface of the third layer 7 can be screen-printed. Any sand that falls on the upper surface of a third layer 7 passes through that layer and also through the second layer 3 to be retained between the first layer 2 and second layer 3. COPYRIGHT: (C)2009,JPO&INPIT
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