Measuring and testing – Specimen stress or strain – or testing by stress or strain... – By loading of specimen
Patent
1990-02-27
1991-03-26
Myracle, Jerry W.
Measuring and testing
Specimen stress or strain, or testing by stress or strain...
By loading of specimen
73 37, G01N 1908
Patent
active
050019350
ABSTRACT:
A method and apparatus for determining the environmental stress crack resistance of plastic articles, such as polyethylene terephthalate containers, are provided. In accordance with the method of the invention, the internal chamber of a hollow plastic article is pressurized, the exterior of the base is then exposed to an environmental stress cracking agent, and it is then determined if crazing and/or changes in the base clearance of the plastic article have occurred. Subsequent increases in pressure and subsequent exposures and determinations yield information on the environmental stress cracking characteristics of the container.
REFERENCES:
patent: 3710616 (1973-01-01), Smith et al.
patent: 4107979 (1978-08-01), Saeda et al.
patent: 4285230 (1981-08-01), Hartness
patent: 4829839 (1989-05-01), Fisher et al.
ASTM-D-2561-70, "Standard Test Method for Environmental Stress-Crack Resistance of Blow-Molded Polyethylene Containers", pp. 302-307 (Reapproved 1984).
Kovacich Alan A.
McKinney Bryan L.
Tekkanat Bora
Tiedemann William H.
Hoover Universal Inc.
Myracle Jerry W.
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