No.2（1999）31.Recycling and processing of tortoise-shell parts

Norimitsu HIROSE, Junichi ASAMI, Yoshiaki IMAZU, Kimihiko KANAYA and Yuji YOKOZAWA

A new method of recycling and processing partially used tortoise-shell parts was investigated. The method can produce tortoise-shell block at a low cost because there was no use a hot press. In order to research the optimum condition to recycle tortoise-shell, tortoise-shell parts were pulverized (particle size:<100μm), and compacted at pressure of 30 to 70MPa at room temperature. Die set, fixed with bolts and nuts, was heated at 370 - 390 K in an autoclave. The transverse rupture strength of the recycled tortoise-shell made by optimum condition was two or three times as strong as old type recycled tortoise-shell (already commercialized). The gloss, machinability and bondability of them can be satisfied for tortoise-shell work (Bekko zaiku).

Keywords
tortoise-shell, recycle, transverse rupture strength, die set, autoclave

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