Hub ring and supporting plate for a filter and methods for manufacturing these members.

摘要

Disclosed is a hub ring 2 for a filter wherein a supporting member 10 having a plurality of supporting portions 10a is interposed between a pair of keep plates 9a and 9b, a supporting plate for a filter wherein a plurality of wave portions extending substantially in the circumferential direction are arranged in the radial direction, and methods for manufacturing these members. The hub ring has a great opening ratio to achieve a low pressure loss property and causes substantially no residence of polymer, and the hub ring can be manufactured at a low cost. The supporting plate has high pressure resistance, low-pressure loss property, good directivity of polymer flow and excellent polymer mixing effect, and it is suitable for use as a retainer disposed inside of a filter.