Title:
RAPID EVALUATION METHOD CONCERNING DURABILITY OF POLYETHYLENE RESIN PIPE AND RAPID QUALITY JUDGEMENT METHOD OF POLYETHYLENE RESIN FOR PIPE
Document Type and Number:
Japanese Patent JP3867236
Kind Code:
B2
Abstract:
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.
Inventors:
Hiroshi Higuchi
Hiroyuki Nishimura
Akira Tanaka
Kurita Tamura
Hiroyuki Nishimura
Akira Tanaka
Kurita Tamura
Application Number:
JP14409498A
Publication Date:
January 10, 2007
Filing Date:
May 26, 1998
Export Citation:
Assignee:
OSAKA GAS CO.,LTD.
International Classes:
G01K11/22; G01N29/00; F16L9/12; (IPC1-7): G01N29/18; G01K11/22; //F16L9/12
Domestic Patent References:
| JP6018493A | ||||
| JP9286820A | ||||
| JP7083888A | ||||
| JP3039089B2 | ||||
| JP10139947A | ||||
| JP5010899A | ||||
| JP11230962A | ||||
| JP11258215A |
Attorney, Agent or Firm:
Tamako Tsutada
Masato Tsuda
Masato Tsuda
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