Urethane foam member, seal structure, toner storage container, process cartridge, image forming apparatus

摘要

A urethane foam member that after cutting into the desired shape from sheet urethane foam is applied with adhesive on one face of the urethane foam, an edge portion of the non-adhesive applied face at least at one side of the urethane foam member being of a low edge profile, to which permanent thermal distortion has been induced such that the thickness of the edge portion of the side is thinnest at the end portion thereof and the thickness gradually increases with distance from the end portion.

主权项

1. A sealing member consisting of a single layer of a urethane foam member, a skin layer provided on the urethane foam member and an adhesive layer, wherein the urethane foam member is an elongated body forming a closed loop frame comprising:
a first surface comprising the adhesive layer disposed thereon; and a second surface comprising an edge portion which is opposed to the first surface, wherein a width of the elongated body increases from the edge portion of the second surface to the first surface, such that the width at the edge portion of the second surface is smaller than remaining portions of the elongated body and such that a cross-section of the elongated body has a substantially D-shape, wherein the second surface comprises two opposing sides thereof having chamfered edges, wherein the urethane foam member consists of urethane foam, wherein a specific gravity of the skin layer is higher than a specific gravity of the urethane foam member apart from the skin layer, wherein the urethane foam is thermally compressed to form the skin layer, and wherein the skin layer has parting lines resulting from waste portions having been parted-off.