Stock material or miscellaneous articles – Hollow or container type article – Cellular material derived from plant or animal source
Patent
1984-11-20
1986-10-07
Kittle, John E.
Stock material or miscellaneous articles
Hollow or container type article
Cellular material derived from plant or animal source
206518, 215 1C, 229 15B, B65D 2500, B65D 144
Patent
active
046159282
ABSTRACT:
A tubular plastic container having a molecularly oriented sidewall portion is made by bringing the peripheral portion of a solid blank in engagement with the shoulder portion of a die, introducing the blank into a cavity of the die while compressing with a first and second plungers, such that in the former stage of the introduction, the speed is relatively low and the pressure is relatively high, and then the speed is increased at a controlled rate and the pressure is decreased, thereby forming a hollow molded piece, and then expanding the molded piece to bringing the sidewall portion thereof into contact with the inner surface of the cavity.
In the similar manner a tubular plastic container having a sidewall portion formed with thick wall portions axially extending and having a relatively large wall thickness and a large curvature, and thin wall portions axially extending and having a relatively small wall thickness and a small curvature which are formed alternately in the circumferential direction, is made by using the second plunger having recesses corresponding to the thick wall portions and having open edge portions.
REFERENCES:
patent: 3169688 (1965-02-01), Schad
patent: 3871541 (1975-03-01), Adomaitis
patent: 3944124 (1976-03-01), Hexel
Kaufman, Intro to Polymer Science & Technology, an SPE Textbook, pp. 538-547, 1977.
Kawaguchi Kiyoshi
Yamada Muneki
Kittle John E.
Toyo Seikan Kaisha Ltd.
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