Member formed from foamed material, feed/transport roller, and sheet-separation roller

Abstract

The present invention provides a foamed member, a feed/transport roller, and a sheet-separation roll, which prevent generation of anomalous sounds during feeding, transporting, or separating paper sheets. The foamed member is formed from polyurethane foam, the polyurethane foam being produced by reacting a polyisocyanate compound with a first polyol which is selected from among a polytetramethylene ether glycol and a diene polyol having at least one double bond in the molecular chain thereof and the fiest polyol has a number average molecular weight of 1,000 to 4,000, in the presence of a cross-linking agent including a short-chain diol and a second polyol having at least three functionalities and a number average molecular weight of 500 to 5,000, wherein the foamed member is formed from a foamed reaction cured product having a foamed product density (weight of the product in a mold [g]/volume of the mold [cm3]) of 0.3 to 0.9 [g/cm3] and exhibits a ratio of maximum value (Max) of an output waveform to minimum value (Min) of the output waveform (Max/Min ratio) falling within a range of 1.00 to 1.40, the output waveform being obtained during measurement of friction coefficient.

Dependencies are inferred from the claim text.