Plastic article or earthenware shaping or treating: apparatus – With mechanical means forming or expanding pores
Patent
1995-06-07
1996-12-24
Nguyen, Khanh P.
Plastic article or earthenware shaping or treating: apparatus
With mechanical means forming or expanding pores
425546, 425812, 425817R, 249141, B29C 3310, B29C 3340, B29C 4458
Patent
active
055871836
ABSTRACT:
A mold for producing foamed articles includes an upper mold and a lower mold which define a mold cavity. A vent is provided in communication with the mold cavity and has a vent passageway with an entrance and an exit. Structure is also provided for sealingly engaging the upper mold with the lower mold to cause, in cooperation with the predetermined size and shape of the vent passageway, liquid foam polymeric composition expanding inside the mold cavity to enter the vent entrance but to not exit from the vent exit to cause at least partial curing of the foam composition within the vent passageway. Preferably, the vent may be ribbon-shaped so that a ribbon of foamed composition adheres to the foamed article and may be folded flat against the article thus avoiding the labor step of trimming the flash from the product. Additionally, or alternatively, the vent may comprise a vent passageway with an obstruction disposed therein to provide one or more openings between the outer surface of the obstruction and the inner surface of the vent passageway. The foam composition in these openings may be expelled by driving the obstruction axially within the passageway. Again, the labor step of hand trimming the flash is avoided.
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Cheng Wilfred W. T.
Clark Leslie E.
Hunter Craig A.
Magee Robert B.
Vande Wetering Gerry
Nguyen Khanh P.
Woodbridge Foam Corporation
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