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RAPID EVALUATION METHOD CONCERNING DURABILITY OF POLYETHYLENE RESIN PIPE AND RAPID QUALITY JUDGEMENT METHOD OF POLYETHYLENE RESIN FOR PIPE
RAPID EVALUATION METHOD CONCERNING DURABILITY OF POLYETHYLENE RESIN PIPE AND RAPID QUALITY JUDGEMENT METHOD OF POLYETHYLENE RESIN FOR PIPE
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机译:聚乙烯管材耐久性的快速评估方法及聚乙烯管材快速质量判定方法
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摘要
PROBLEM TO BE SOLVED: To provide a method by which the durability evaluation of a gas pipe made of a polyethylene resin and the quality judgement of a polyethylene resin for gas pipe can be executed rapidly. ;SOLUTION: In this evaluation method, the durability of a pipe is judged good in the case where the condition shown by (1) is fulfilled by a polyethylene resin composing a pipe, and besides, it is judged better in the case where the condition shown by (2) is fulfilled additionally. (1) A temperature dependency curve, obtained by measuring temperature dependency of sound wave propagation characteristics from room temperature to a temperature of perfect fluidization, has a sub-peak other than a main absorption peak caused by fusion or solidification of the whole. (2) The curve has two or more sub-peaks.;COPYRIGHT: (C)1999,JPO
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