Plastic article or earthenware shaping or treating: apparatus – Means feeding fluent stock from plural sources to common...
Patent
1994-06-20
1995-08-08
Heitbrink, Tim
Plastic article or earthenware shaping or treating: apparatus
Means feeding fluent stock from plural sources to common...
264572, B29C 4516
Patent
active
054393655
ABSTRACT:
A mold apparatus and method is used to form a solid injection molded plastic part having no internal voids, a Class A finish, a sink-free exterior appearance surface, and unevenly distributed structural detail extending from the opposite surface, the detail including free-standing reinforcement ribs, attachment bosses, and the like. A charge of hot melted thermoplastic and pressurized gas are sequentially injected into a mold cavity defining the shape of the desired part, the plastic not filling the cavity and being simultaneously received in shaped recesses and grooves which form the structural detail. The pressurized gas forces the hot plastic from one mold half against the other mold half, and into the recesses and grooves, and is maintained during cooling. A gas seal is formed by the plastic to prevent gas in the mold cavity from reaching the finished exterior surface of the part during shrinkage of the plastic. Gas inlets and plastic volume areas cooperate with rib forming chambers to enhance resin distribution in the cavity. Importantly, the gas can be reclaimed, such as for recirculation and cooling.
REFERENCES:
patent: 3329198 (1967-07-01), Manning
patent: 3345687 (1967-10-01), Marx
patent: 4101617 (1978-07-01), Friedrich
patent: 4140672 (1979-02-01), Kataoka
patent: 4201742 (1980-05-01), Hendry
patent: 4309380 (1982-01-01), Sauer
patent: 4474717 (1984-10-01), Hendry
patent: 4479914 (1984-10-01), Baumrucken
patent: 4531703 (1985-07-01), Underwood
patent: 4740150 (1988-04-01), Sayer
patent: 4755128 (1988-07-01), Alexander
patent: 4923666 (1990-05-01), Yamazaki
patent: 4948547 (1990-08-01), Hendry
patent: 5162122 (1992-11-01), Loren
"Gas Injection Molding, Plastics Technology," Sep., 1991, pp. 43-49.
"Gas Assisted Injection Molding--The New Thermoplastic Molding Technology for Exterior Body Panels," Dr. Ken C. Rusch, 890699, presented at the 1989 meeting of the Society of Automotive Engineers, Mar. 2, 1989.
Heitbrink Tim
ICP Systems, Inc.
LandOfFree
Apparatus for fluid compression of injection molded plastic mate does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Apparatus for fluid compression of injection molded plastic mate, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Apparatus for fluid compression of injection molded plastic mate will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-967719