Ink roller and a method of producing the same
AssigneeBridgestone Tire Company Limited
InventorsTsuneaki Narumiya, Take Sato, Shigeru Iwasawa
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Abstract
An ink roller and a method of producing the same are disclosed. This ink roller is produced by preheating a flexible polyurethane foam havng a three-dimensional skeletal reticulated structure and a pore size of 20-60 pores/cm at 130.degree.-190.degree. C., subjecting the preheated foam to permanent deformation through compression at a temperature of 130.degree.-220.degree. C. and a compressibility of 1/3-1/15 and cutting the resulting compression body having a hardness of 15.degree.-60.degree. into a given shape in such a manner that the axial direction is coincident with the compression direction of the compression body.
Claims5
In an ink roller composed of a compression body, which is obtained by subjecting a flexible polyurethane foam to permanent deformation through compression in a certain direction, and having an axial direction coincident with the compression direction of said compression body, the improvement wherein said compression body is formed by permanently deforming a flexible polyurethane foam having a three-dimensional skeletal reticulated structure and a pore size of 20-60 pores per linear centimeter at a compressibility of 1/3-1/15 and has a hardness of 15.degree.-60.degree. as measured by an Ascar's C-type rubber hardness tester (Japanese Rubber Associate Standard SR 1S-0101).
A method of producing ink rollers comprising preheating a flexible polyurethane foam having a three-dimensional skeletal reticulated structure and a pore size of 20-60 pores per linear centimeter at a temperature of 130.degree.-190.degree. C., compressing the preheated foam at a compressibility of 1/3-1/15 using a hot press heated to a temperature of 130.degree.-220.degree. C. to conduct permanent deformation, and cutting the resulting compression body into a given shape in such a manner that the axial direction is coincident with the compression direction of said compression body.
Dependencies are inferred from the claim text.