Plastic article or earthenware shaping or treating: apparatus – Female mold and charger to supply fluent stock under... – With means to evacuate mold or provide controlled environment
Patent
1998-08-28
2000-12-26
Davis, Robert
Plastic article or earthenware shaping or treating: apparatus
Female mold and charger to supply fluent stock under...
With means to evacuate mold or provide controlled environment
2643281, 425556, 425577, 425812, B29C 3310
Patent
active
061649538
ABSTRACT:
A method and mold and assembly for use in the mold are provided to make plastic articles having reduced surface defects wherein gases and/or volatiles normally trapped at at least one surface of the article are absorbed by at least one porous part to degas the at least one surface. In one embodiment, first and second porous parts such as porous metal parts can be fit within the first and second mold halves, respectively, to degas opposite surfaces of the article while preventing the passage of plastic from the article-defining cavity in the closed position of the mold. In a second embodiment, a sintered metal plug is utilized to locally degas a single surface of the article. In a third embodiment, an ejector pin and a core pin are formed from sintered metal to degas spaced local surfaces on the same side of the article. The porous metal parts may be sized so that the porous metal parts help to form at least one "Class A" surface formed in the article-defining cavity so that the article can be used in applications which require such Class A surfaces such as in automotive applications.
REFERENCES:
patent: 3555620 (1971-01-01), Bucy
patent: 3645492 (1972-02-01), Edlis
patent: 4009978 (1977-03-01), Hanning
patent: 4123218 (1978-10-01), Krall
patent: 4531703 (1985-07-01), Underwood
patent: 5169577 (1992-12-01), Feichtinger
patent: 5217729 (1993-06-01), Terauchi et al.
patent: 5284429 (1994-02-01), Schneider et al.
patent: 5316605 (1994-05-01), Rakonjac et al.
patent: 5342191 (1994-08-01), Shah et al.
patent: 5356281 (1994-10-01), Katsuno et al.
patent: 5431873 (1995-07-01), Vandenberghe
patent: 5516551 (1996-05-01), Anderson et al.
patent: 5545366 (1996-08-01), Lust et al.
patent: 5599630 (1997-02-01), Smith et al.
patent: 5635221 (1997-06-01), Han
patent: 5665281 (1997-09-01), Drummond
patent: 5730926 (1998-03-01), Matsumoto et al.
Davis Robert
Patent Holding Company
LandOfFree
Method and mold to make plastic articles having reduced surface does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method and mold to make plastic articles having reduced surface , we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and mold to make plastic articles having reduced surface will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-988729