Plastic article or earthenware shaping or treating: apparatus – With mechanical means forming or expanding pores
Patent
1989-12-11
1990-06-26
Woo, Jay H.
Plastic article or earthenware shaping or treating: apparatus
With mechanical means forming or expanding pores
249124, 249176, 264 465, 425117, 425577, 425817R, B28B 718, B29C 4536
Patent
active
049367625
ABSTRACT:
This disclosure illustrates and describes a test mold for the quantitative measure of the effects of formulation and/or process variable changes on some kinds of surface problems of a molded part caused by different degrees of imperfection or voiding underneath the part surface. The molded part can be single component or composite, solid or foamed. One example of the surface problem is the so-called "measles or cellulite" problem observed on the vinyl surface of a vinyl/foam composite due to the voids or rattiness within the foam. To accomplish this result, the mold has various sized, spaced apart, aligned openings formed in each of the front and rear walls of the mold, but with the centers thereof at different elevations in the respective front and rear walls. Removable rods inserted through the aligned mold wall openings produce longitudinal openings through the part which is molded around the rods, permitting the effect thereof on the surface of the molded part to be evaluated.
REFERENCES:
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patent: 2829400 (1958-04-01), Morin
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patent: 3318563 (1967-05-01), Downing
patent: 3384335 (1968-05-01), Schwarz
patent: 3482326 (1969-12-01), Brewster
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patent: 4439122 (1984-03-01), Besse et al.
Gaudreau Laurent R.
Grimmer Robert
Lue Ching T.
Davidson Textron Inc.
Evans John C.
Nguyen K. P.
Woo Jay H.
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