Plastic and nonmetallic article shaping or treating: processes – Pore forming in situ – Composite article making
Patent
1975-07-21
1977-08-23
Silbaugh, Jan H.
Plastic and nonmetallic article shaping or treating: processes
Pore forming in situ
Composite article making
264327, 425526, 425528, B29C 1707
Patent
active
040440869
ABSTRACT:
A molecularly oriented article having a tubular sidewall is blow-molded from a thermoplastic parison which is heat-treated prior to blowing to provide the parison sidewall with a temperature gradient wherein the temperature of the inside of the sidewall is greater than that of the outside, both of said temperatures being within the orientation temperature range of the thermoplastic. The temperature gradient results in the sidewall of the article having a different and more uniform circumferential orientation release stress distribution radially across the sidewall than would be obtained if the parison were blown isothermally.
REFERENCES:
patent: 3141912 (1964-07-01), Goldman et al.
patent: 3873660 (1975-03-01), Reilly et al.
patent: 3882213 (1975-05-01), Uhlig
patent: 3892830 (1975-07-01), Hudson et al.
McChesney Charles Edmund
McHenry Robert J.
Wachtel James Alan
American Can Company
Auber Robert P.
Bock James W.
Silbaugh Jan H.
Ziehmer George P.
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