Plastic article or earthenware shaping or treating: apparatus – With mechanical means forming or expanding pores
Patent
1997-12-29
2000-09-05
Kuhns, Allan R.
Plastic article or earthenware shaping or treating: apparatus
With mechanical means forming or expanding pores
425 73, 425325, 425388, B29C 4434, B29C 4778
Patent
active
061133744
ABSTRACT:
An extrusion system utilizes single or tandem extruders and a mixer-cooler to extrude a foamable extrudate through a die in a sealable chamber. The foamable extrudate is shaped and calibrated within the chamber. The die is mounted on the end of a gel tube projecting through a gland seal in a fixed bulkhead forming the upstream end of the chamber. The gel tube and mixer-cooler are mounted on a movable carriage, movement of which may be used to adjust the die with respect to shaping and calibrating equipment inside the chamber. The mixer-cooler achieves a selected narrow range of uniform viscosity of the melt at the die depending on the size of the product and density. The chamber is preferably a vacuum chamber producing low density foams. The product exits the chamber to atmosphere on a continuous basis through a submerged orifice in a water baffle immersion seal. The mixer-cooler enables a large size low density product to be produced with uniform cellular structure without cell collapse or density gradients, as the product is subjected to the pressure and temperature transformations passing from the chamber to atmosphere through the water. The seal includes the submerged orifice with a free wheeling guiding system upstream of the orifice. Immediately ahead of the guiding system, the parameters of the foam extrudate are sensed to control the configuration of the orifice on a continuous basis. Before the extrudate passes into the water baffle seal it moves over a floating dancer roll, the position of which controls a haul-off such as a vacuum belt at the tail end of the system. This avoids pushing on the extrudate.
REFERENCES:
patent: 3751377 (1973-08-01), Buckner
patent: 4211739 (1980-07-01), Phipps
patent: 4244897 (1981-01-01), Moon
patent: 4247276 (1981-01-01), Phipps
patent: 4324493 (1982-04-01), Colombo
patent: 4436679 (1984-03-01), Winstead
patent: 4454087 (1984-06-01), Hayashi et al.
patent: 4556369 (1985-12-01), Braun
patent: 4689355 (1987-08-01), Treptow et al.
patent: 4746478 (1988-05-01), Fujisaki et al.
patent: 4783291 (1988-11-01), Pagan
patent: 4966540 (1990-10-01), Taguchi et al.
patent: 5176925 (1993-01-01), Weber et al.
Brackman Joseph A.
Breindel Raymond M.
Sadinski Robert L.
Chi Anthony R.
Eckert Inger H.
Kuhns Allan R.
Owens Corning Fiberglass Technology, Inc.
LandOfFree
Foam extrusion apparatus does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Foam extrusion apparatus, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Foam extrusion apparatus will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2206296