Plastic and nonmetallic article shaping or treating: processes – Forming articles by uniting randomly associated particles – Plural – intermittent pressure applying
Patent
1984-05-14
1986-08-05
Derrington, James
Plastic and nonmetallic article shaping or treating: processes
Forming articles by uniting randomly associated particles
Plural, intermittent pressure applying
264313, 264314, 419 3, 419 42, 419 68, B28B 300
Patent
active
046042520
ABSTRACT:
A process for the production of a hollow or a solid profile (21) from dry powder material (27) is accomplished by means of a flexible form (7), through means of which a mold cavity (25) is enclosed in sleeve fashion. The flexible form (7) is capable of being placed under external pressure, over its entire length, radially from all sides, in order to compact, radially, the powder material (27) found, and capable of being poured, inside the form (7). In order to be able to produce endless solid profiles and/or hollow profiles from dry powder material, provided for is that the production of the profile (21) can be accomplished by sections and, additionally, that the mold form (25), running constant at its one end up to the profile diameter, and here limited by the precompacted profile section (21) and at its other end by the mutually convergent inner surfaces (8) of the flexible form provided with a top supply opening (17), is uniformly filled with a measured amount of powder material (27). The extrusion process is accomplished here such that, because of the convergence of the elastic form (7) mentioned, the tapered, formed-out profile end (23) of a precompacted profile section (21) is covered over by the radially compacted powder material (27) and, in this manner, is joined therewith. In the next step, the thusly pressed profile section (21) is pushed toward the outside by one step.
REFERENCES:
patent: 2936483 (1960-05-01), Deakin
patent: 3092878 (1963-06-01), Conger
patent: 3193900 (1965-06-01), Wendt
patent: 3193901 (1965-07-01), Lee et al.
patent: 3200442 (1965-08-01), Haller
patent: 4370120 (1983-01-01), Foster et al.
Derrington James
Haugen Orrin M.
Nikolai Thomas J.
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