Patent ID: 6471877
Filing Date: 2002-10-29
Classification: B01D,B29B,B29K,C08G

Abstract:
A filtration apparatus for a polycarbonate comprising as constituent elements:(a) a filtration container having a polymer inlet passage and an opening; (b) a flange plate interfitting with the opening; (c) one or more leaf disc-shaped filters for filtering a polymer introduced into the filtration container through the polymer inlet passage; (d) a filter presser for fixing the disc-shaped filters to each other and applying sealing pressure on junction parts of the leaf disc-shaped filters; and (e) a center pole placed on a space formed by inner circumferences of the leaf disc-shaped filters, for collecting the polymer filtered by the leaf disc-shaped filters and for discharging it outside the filtration apparatus, and integrated with the filter presser, wherein the center pole includes a penetration part that penetrates the flange plate, the flange plate has a sealing part for preventing the intrusion of a polymer down along the center pole into the penetration part of the center pole on a filtration container side of the flange plate, and the flange plate has a fixture nut for fixing the center pole with the flange plate on a side opposite to the filtration container of the flange plate.