| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide an environmentally green pass case which can be easily manufactured, securing sufficient abutting strength without reducing the value as a commodity. SOLUTION: This pass case 1 has a pair of synthetic resin boards 2, 3 opposite to each other and crosspieces 4, 5 and 6 fused to the ambient edges of the boards 2 and 3. The boards 2 and 3 are made of amorphous polyethylene terephthalate, and the crosspieces 4, 5 and 6 are made of polyester polyurethane whose elongation is larger than that of the boards 2 and 3.</p> |
