| 摘要 |
PURPOSE:To prevent the deformation or destruction of a laminate obtained by laminating a plurality of layers due to bonding inferiority at the time of use. CONSTITUTION:The distribution density of the bonded surface of a laminate is made dense in the central part 13A of the bonded surface and rough in the peripheral part 13B thereof or a hard binder is arranged to the central part and a soft binder is arranged to the peripheral part thereof. |
