Receptacles – Sidewall structure – Contoured sidewall
Patent
1997-03-24
1999-02-02
Pollard, Steven
Receptacles
Sidewall structure
Contoured sidewall
220623, 220908, B65D 4500
Patent
active
058653384
ABSTRACT:
An improved method of blow molding a hollow article is disclosed comprising the adaptation of a die pin (26) to include spaced apart channels (38) therein that extend from top to bottom along the sides of the die pin. The channels create reinforcement ribs (70) along the inside surface (68) of a formed parison (30). The ribs expand with the parison into a final form and serve to reinforce the resultant body while being visible only from the inside. The channels (38) are each bifurcated to provide a segment (44) below a shut-off surface (46) in which plastic exiting the die pin can expand to form ribs (70) of substantial thickness. Portions of the parison sidewalls (66) between the ribs (70) are thinned to reduce part weight and the ribs (70) reinforce the sidewalls to compensate yet, being visible only from the inside, do not detract from the external appearance of the article.
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Nathan Timothy A.
O'Planick Richard B.
Pollard Steven
Rubbermaid Incorporated
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