Rubber sheet for turntable
专利汇可以提供Rubber sheet for turntable专利检索，专利查询，专利分析的服务。并且PURPOSE: To prevent the howling to ensure a reproduced sound which is faithful to the original sound, by giving a specified form to one surface of a disk-shaped sheet made of the vulcanized molded product of the rubber composition composed of polynorbornene, factice and oil.
CONSTITUTION: The vulcanized molding is given to the rubber composition composed of the 100pts.wt. polynorbornane only or the mixture of the polynorbornene and other rubber, the 5W500pts.wt. of white-color factice only or the mixture of the said factice and other factice, and 200W1,000pts.wt. oil of one type or more among the aromatic-group, naphthene-group, paraffin-groups, vegetable-group and animal-group, respectively. Thus the rubber sheet is obtained for a turntable. The vulcanized molded product requires 1W15 hardness (Shore hardness), 1W50kg/cm
2 tensile strength, 120W1,000% elongation, 40W90% coefficient of impact resilience and 0.93W1.05 specific gravity. Then several units of ribs 2 having a concentric form of 0.3W1.8mm height are provided on one surface of the sheet main body 1, and the notches 3 are given densely to the rib 2. The rib face is turned properly to the turntable or the record disk.
COPYRIGHT: (C)1981,JPO&Japio，下面是Rubber sheet for turntable专利的具体信息内容。
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