Stock material or miscellaneous articles – Hollow or container type article – Cellular material derived from plant or animal source
Patent
1981-05-05
1984-02-07
Epstein, Henry F.
Stock material or miscellaneous articles
Hollow or container type article
Cellular material derived from plant or animal source
428192, 4285428, B65D 122
Patent
active
044303700
ABSTRACT:
An improved thermoplastic molded part is disclosed including a stress reducing juncture which is operative to reduce the differential shrinkage of the molded plastic, which would otherwise develop due to the uneven cooling of the plastic to room temperature, thereby inhibiting the warping of the part. More specifically, an improved thermoplastic molded part is provided including at least one wall member formed unitary with another structural element such as another wall, flange or boss area. The thermoplastic part is further provided with a stress reducing juncture, defined by an elongated trough-like recess, located in the wall member adjacent the other structural element. Preferably, the recess has a width approximately equal to the width of the wall member and a depth equal to approximately one half that width. The recess functions to decrease internal stresses that normally develop due to differential shrinkage of the molded plastic during cooling to room temperature. By reducing internal stresses, the unwanted warping of the part is minimized.
REFERENCES:
patent: 3240845 (1966-03-01), Voelker
patent: 3551940 (1971-01-01), Edison
patent: 3816181 (1974-06-01), Buckethal
patent: 3907193 (1975-09-01), Heller
patent: 4249357 (1981-02-01), Cornou
patent: 4341307 (1982-07-01), Shyers
patent: 4359157 (1982-11-01), Horstmann
Epstein Henry F.
General Electric Company
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