Resin member
AssigneeNippon Pillar Packing Co., Ltd.
InventorsKazukiyo Teshima, Naoto Yamada
Life of this patent
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Abstract
A resin member capable of inhibiting generation of particles due to repeated bending thereof is provided. A rolling diaphragm 5 composed of a resin member has one surface formed as a liquid contact surface 37a, repeatedly bends when used, and has flexibility. A surface roughness of the liquid contact surface 37a at a portion 371 that bends is less than 0.40 μm as an arithmetic average roughness, and a total light reflectance of the liquid contact surface 37a at the portion 371 that bends is not less than 2.0%.
Claims1
A resin member having one surface formed as a liquid contact surface, the resin member repeatedly bending when used, the resin member having flexibility, wherein
- the resin member is a diaphragm for a pump, the diaphragm having:
- a surface roughness of the liquid contact surface at a portion that bends is less than 0.40 μm as an arithmetic average roughness,
- a total light reflectance of the liquid contact surface at the portion that bends is not less than 2.0%,
- a cross-sectional shape of the liquid contact surface at the portion that bends is a shape in which recesses and projections are alternately continuous,
- the recesses are formed by concave curved surfaces, wherein the recesses have no flat surface at a bottom of the concave curved surfaces, and
- ends of the projections are formed as sharp ends, wherein the projections have no flat surfaces at an end of the sharp ends.
Dependencies are inferred from the claim text.