US 12,145,300 B2
Method for testing melt-processible fluororesin injection-molded product and method for producing melt-processible fluororesin injection-molded product
Takahisa Aoyama, Osaka (JP); Hayato Tsuda, Osaka (JP); and Yuuki Kuwajima, Osaka (JP)
Assigned to DAIKIN INDUSTRIES, LTD., Osaka (JP)
Appl. No. 17/259,840
Filed by DAIKIN INDUSTRIES, LTD., Osaka (JP)
PCT Filed Jun. 17, 2019, PCT No. PCT/JP2019/023907
§ 371(c)(1), (2) Date Jan. 12, 2021,
PCT Pub. No. WO2020/017215, PCT Pub. Date Jan. 23, 2020.
Claims priority of application No. 2018-134253 (JP), filed on Jul. 17, 2018.
Prior Publication US 2023/0066133 A1, Mar. 2, 2023
Int. Cl. G01N 3/08 (2006.01); B29C 45/76 (2006.01); G01N 33/44 (2006.01)
CPC B29C 45/7686 (2013.01) [G01N 3/08 (2013.01); G01N 33/442 (2013.01); G01N 2203/0017 (2013.01); G01N 2203/0075 (2013.01)] 7 Claims
OG exemplary drawing
 
1. A method for testing a melt-fabricable fluororesin injection-molded article, the method comprising
performing a tensile test on the injection-molded article to obtain a stress-strain curve or tensile strength-strain curve,
dividing the stress-strain curve or tensile strength-strain curve into two or more regions according to a strain level, obtaining a reduction amount or reduction rate of the stress or tensile strength in a large strain region relative to the stress or tensile strength in a small strain region,
determining an injection-molded article having a small reduction amount or reduction rate of the stress or tensile strength as a non-defective article due to a crack or delamination and an injection-molded article having a large reduction amount or reduction rate of the stress or tensile strength as a defective article due to a crack or delamination, and
sorting out non-defective articles from defective articles among the injection-molded articles.