| 摘要 |
Unusually strong and highly perforated plates are formed by pressurized filtration of a suspension of chopped ceramic fibers in an aqueous dispersion of colloidal alumina or colloidal silica through a mold having a perforated filter base and a pin support base having pins that extend through and beyond the perforations of the filter base. Pressurized filtration is preferably conducted by applying vacuum on the down stream side of the mold. When the layer of chopped fibers deposited on the perforated filter base has the desired thickness, filtration is stopped. The perforated filter base and pin support base are moved apart to retract the pins from contact with the perforated layer of chopped fibers which is transferred to a drier operating at a temperature not exceeding 650 DEG F., for conversion into a strong perforated plate.
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