| 摘要 |
A filter comprises a mesh of filaments stretched across a frame. Each filament is a synthetic resin monofilament coated with a metallic film and with black or gray paint. The frame is pref. generally rectangular to conform to the tube, and is of black or gray plastics with reinforcements embeded at the corners. The monofilament is pref. of polyester, the film is of nickel, and the paint is of synthetic resin mixed with carbon black. The monofilament is e.g. of 20 denier and the nickel is nonelectrolytically plated or vacuum deposited, while the paint is polyurethane based.
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