Plastic article or earthenware shaping or treating: apparatus – With foraminous or absorbent means for removal of vehicle or... – Vacuum means
Patent
1993-10-04
1995-11-21
Davis, Robert B.
Plastic article or earthenware shaping or treating: apparatus
With foraminous or absorbent means for removal of vehicle or...
Vacuum means
264 87, 425256, 425422, 425437, B29C 4336
Patent
active
054681359
ABSTRACT:
A process for manufacturing containers that are suitable for containing materials that are to be heated by microwave radiation or other heating equipment includes making a dilute liquid dispersion of quartz and/or glass fibers (very preferably microfibers), depositing them on the interior of a permeable female mold or form, from the dispersion by way of a pressure differential across the female mold, with the liquid passing through the mold, moving a male mold or form which matches the female mold, into and against the container in the female mold, terminating the pressure differential across the female mold, applying a pressure differential across the male mold to release the container from the female mold and press it against the male mold exterior, withdrawing the male mold, with the container held to it, releasing the container from the male mold and sintering the container, to make it form retaining. A suitable apparatus for practicing such process is also described, as are containers made with such apparatus and by such process, which containers are preferably light weight and porous microfibrous ashing containers for use in analytical processes. Also described are improved processes and apparatuses for molding fibers from a liquid dispersion by utilizing microperforated molds, especially those that have tapered perforations, with the larger diameter openings thereof being adjacent to the fibers, which facilitates withdrawal of the molded items from such molds.
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CEM Corporation
Davis Robert B.
Kramer Raymond F.
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