Plastic and nonmetallic article shaping or treating: processes – Removal of liquid component or carrier through porous mold... – By direct application of vacuum or pneumatic pressure
Patent
1986-08-04
1989-11-21
Silbaugh, Jan H.
Plastic and nonmetallic article shaping or treating: processes
Removal of liquid component or carrier through porous mold...
By direct application of vacuum or pneumatic pressure
249 661, 264335, 264336, 425437, B28B 126, B28B 712
Patent
active
048821110
ABSTRACT:
A method for drain-casting a slip to obtain a substantially hollow molded article 42 is provided, by the use of an apparatus including a divisible mold 21 including an upper mold portion 22, a lower mold portion 23, and at least two side mold portions 24, 25 to form a mold cavity 38, each mold portion containing a filter member and a water-drainage means, and the lower portion having a slip supply duct 40. The method includes pressurizing a slip introduced into the mold cavity 38 to deposit the slip onto the filter members, draining an undeposited slip through the slip supply duct 40, removing the upper and lower mold portions 22, 23 by applying compressed air to the water-drainage means 34, 35 of the mold portions to exude some water between the filter members 30, 31 and the resulting molded article 42, holding and supporting the molded article 42 between the side mold portions 24, 25, applying compressed air to the water-drainage means 36, 37 as described above, and thus demolding the molded article 42 on the stand 43 safely.
REFERENCES:
patent: 2669762 (1954-02-01), Blackburn et al.
patent: 3206534 (1965-09-01), Vogele et al.
patent: 3461194 (1969-08-01), Alexander
patent: 3594462 (1971-07-01), Vrijma
patent: 3594465 (1971-07-01), Vrijma
patent: 3792149 (1974-02-01), Derror
patent: 4528152 (1985-07-01), Aoyama et al.
Inax Corporation
Kutach Karen D.
Silbaugh Jan H.
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