To effectively and easily enable the dismantling of a waste product such as a household electric appliance and the fractional recovery of parts.
In the product in which a plurality of parts are fastened with a fastener (for example, a screw to be easily dismantled) deforming to release the fastening by heating, structure for increasing buoyancy is provided in a part of the part (for example, casings 1,2 and a button part 4) forming the product. When dismantling with warm water by heating, the difference in specific gravity is given to the component parts 1-4 of the product to make afloat the part of the component parts in a warm water tub 100, so as to enable the dismantling of the product and the separation of the part, and the fractional recovery at the same time.
TANIGAWA MASANOBU
YASUDA TAKEO
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