PURPOSE: To increase no weight even when rainwater is permeated and generate no odor following the decomposition of rainwater by setting and fixing in parallel bar-shaped pieces composed of closed-cell bodies between sheets composed of closed-cell bodies facing each other in a manner of interposing and bonding together with spaces.
CONSTITUTION: An impact absorbing board B is constituted of cylindrical bodies 4 of same diameter and of same length as the vertical length of sheets 1 and 2 are set and fixed in parallel between two sheets 1 and 2 composed of closed- cell bodies facing one another. The cylindrical bodies 4 are interposed between both sheets 1 and 2 in a manner in which side faces facing one another are brought into contact with and adjacent to, and bonded together by a conventional method such as heat fusion bonding, bonding by a binder or the like. Spaces 3 as air layers are formed among both sheets 1 and 2 and the cylindrical bodies 4 on the impact absoring board B and also in the inner diameters of the cylindrical bodies 4 respectively. Pillar bodies 5 of the same material are interposed and bonded together along the both side edges in the vertical length direction of the sheets 1 and 2.
NAGAOKA ISAO
OKAYAMA KUICHI
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