Plastic and nonmetallic article shaping or treating: processes – Forming articles by uniting randomly associated particles – Plural – intermittent pressure applying
Patent
1987-09-30
1990-06-26
Silbaugh, Jan H.
Plastic and nonmetallic article shaping or treating: processes
Forming articles by uniting randomly associated particles
Plural, intermittent pressure applying
264314, 2642971, 425389, 4254051, 425DIG14, 425DIG44, B29C 4314, B29C 4326, B29C 4336, B29C 4344
Patent
active
049370251
ABSTRACT:
Methods and apparatus for making self-supporting bodies from particulate materials. The apparatus includes a mold with opposed first and second walls defining a particulate chamber therebetween. The second wall is advanceable and retractable toward and away from the first wall. A plurality of chamber reducers may be removably mounted over each of the walls. Thick-walled members can be incrementally built up by pressing successive batches of particulate material at low and high pressures respectively. The chamber reducers can be successively removed between such batches, or can be used to vary the mold for making bodies of different sizes. A long body can be built up in increments, using a shorter mold, by forming a first increment, displacing the increment lengthwise in the mold, adding another batch of particulate material in overlapping relation to the first body increment, and then pressing such other batch to form a second increment bonded to the first. The latter technique is enhanced by applying different forces or pressures to different sections of the second wall along the length of the mold.
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MacJewel Tool Development, Technical Manual, FIGS. 3-6 and Parts List.
Foster Robert D.
Weeden Frank G.
Fertig Mary Lynn
Hydra Corporation
Silbaugh Jan H.
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