Plastic article or earthenware shaping or treating: apparatus – Means applying electrical or wave energy directly to work – Electro-static or inductive field
Patent
1979-10-29
1981-05-19
Derrington, James H.
Plastic article or earthenware shaping or treating: apparatus
Means applying electrical or wave energy directly to work
Electro-static or inductive field
264 25, 264 26, 425174, 4251748R, B29H 526
Patent
active
042682380
ABSTRACT:
A three-dimensional flow molding process and associated molding apparatus for making plastic parts or pieces utilizing a radio frequency heating field and means for applying constant pressure, along with an even temperature gradient, to the plastic part. In the process two metallic mold halves are joined clamping therebetween an imprinted diaphragm having the plastic on one side thereof between the diaphragm and one of the mold halves. In one version which may be preferred in constructing planar (two-dimensional) pieces or parts, pressure is applied directly by closing the mold halves and the diaphragm has a constant thickness therealong to provide even heating of the plastic that is being molded. In another version of the invention preferably for molding three-dimensional parts, a liquid conductor, such as mercury, or a sodium or graphite solution extends about the other side of the diaphragm in a space provided in one of the mold halves. In this version each of the mold halves is preferably provided with means for cooling. After the plastic, which may be in many different forms, is in place and the mold has been closed, the field may be applied for, for example, 5 seconds. The pressure on the mercury is maintained for the initial 5 second interval and for an additional like interval to produce a part of high quality having an excellent and consistent imprint from the diaphragm.
REFERENCES:
patent: 2388824 (1945-11-01), Brown
patent: 2401991 (1946-06-01), Walton et al.
patent: 2423902 (1947-07-01), Peterson
patent: 2492000 (1949-12-01), Morris et al.
patent: 2922865 (1960-01-01), Schattler et al.
patent: 3010157 (1961-11-01), Cizek
patent: 4128375 (1978-12-01), Schubart
Clint, Inc.
Derrington James H.
LandOfFree
Flow molding does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Flow molding, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Flow molding will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1487531