Forming substantially rectangular articles from preforms of poly

Details Forming substantially rectangular articles from preforms of poly Forming substantially rectangular articles from preforms of poly

1979-03-27

1981-03-03

Silbaugh, Jan H.

Plastic and nonmetallic article shaping or treating: processes

Direct application of fluid pressure differential to...

Including application of internal fluid pressure to hollow...

264532, 264535, B29C 1707

Patent

active

042540801

ABSTRACT:
In forming hollow, molecularly oriented articles having substantially rectangular cross sections from thermoplastic preforms by a method which includes distending the preforms in a mold while at molecular orientation temperature, the improvement providing improved material distribution in regions furthest from the central axes of the articles (e.g. in the corner areas) when the thermoplastic is moldable polyalkylene terephthalate having an inherent viscosity of at least 0.55 which involves limiting the corner definition ratio to between about 2 to about 14 and the circular deviation ratio to no greater than about 2.4 at the cross section during distension and controlling axial and maximum radial stretch of the preforms within predetermined limits.

REFERENCES:
patent: 3632713 (1972-01-01), Seefluth
patent: 3662048 (1972-05-01), Turner
patent: 3733309 (1973-05-01), Wyeth et al.
patent: 3775524 (1973-11-01), Seefluth
patent: 3892830 (1975-07-01), Hudson et al.
patent: 3900120 (1975-08-01), Sincock
patent: 3917095 (1975-11-01), Seefluth
patent: 3989784 (1976-11-01), Uhlig
patent: 4117050 (1978-09-01), Appel et al.
patent: 4131666 (1978-12-01), Agrawal et al.
J. A. Antonopoulos and F. G. Hohmann, Modern Plastics, "Stretch-blow molding PVC and Nitriles", 9-1976.

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