Image-transfer apparatus with a transfer cylinder having a specific surface form

An image-transfer apparatus, comprising:

• a rotatable platen having a platen surface and a cut-off portion on the surface;
• a rotatable transfer cylinder having a transfer cylinder surface and a cut-off portion on said transfer cylinder surface, said transfer cylinder being disposed adjacent to said platen such that said transfer cylinder and said platen form a nip therebetween during rotation thereof;
• wherein said transfer cylinder has the properties of, at a transfer temperature in the range of 80.degree. C. to 150.degree. C., and at said transfer cylinder surface thereof other than said cut-off portion on the said transfer cylinder surface, a cylindricity of no more than 100 .mu.m, a circumferential deviation measured in the radial direction of said transfer cylinder of no more than 60 .mu.m and a straightness measured on said transfer cylinder surface of no more than 60 .mu.m.

An image-transfer apparatus made by the process of providing a rotatable platen having a platen surface and a cut-off portion on the surface, manufacturing a rotatable transfer cylinder having a transfer cylinder surface and a cut-off portion on the transfer cylinder surface at a transfer temperature in the range of 80.degree. C. to 150.degree. C. such that the transfer cylinder has the properties of, at the transfer temperature in the range of 80.degree. C. to 150.degree. C., and at the transfer cylinder surface thereof other than said cut-off portion on the transfer cylinder surface, a cylindricity of no more than 100 .mu.m, a circumferential deviation measured in the radial direction of the transfer cylinder of no more than 60 .mu.m and a straightness measured on the transfer cylinder surface of no more than 60 .mu.m, and disposing the transfer cylinder adjacent to said platen such that said transfer cylinder and said platen can form a nip therebetween during rotation thereof.