Process for manufacture of containers for materials being heated

Plastic and nonmetallic article shaping or treating: processes – Pore forming in situ – By mechanically introducing gas into material

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264 60, 264 87, B28B 126

Patent

active

054416817

ABSTRACT:
A process for manufacturing containers for holding heated materials includes the steps of depositing a dispersion of fibers in a liquid onto the interior of a liquid permeable female mold, removing liquid from the deposited dispersion by applying a pressure differential across the mold, with the higher pressure being in the interior of the mold, moving a liquid permeable male mold into the female mold, terminating the pressure differential across the female mold, applying a pressure differential across the male mold, with the higher pressure being on the exterior thereof, to press the container onto the male mold exterior, withdrawing the male mold from the female mold, with the container being held to the male mold, and releasing the container from the male mold. In preferred processes the pressure differentials are effected by application of vacuum, the dispersion of fibers is an aqueous dispersion of quartz and/or glass microfibers, with the percentage by weight of the fibers in the dispersion being in the range of 0.2 to 4%, the container is substantially flat cylindrical in shape and is sintered to permanent shape after release from the male mold. A suitable apparatus for practicing such a process is also described, as are containers made with such an apparatus and by such a process. Also described are improved processes and apparatuses in which microperforated and microporous molds are utilized.

REFERENCES:
patent: 5252274 (1993-10-01), Thomas

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