Patent ID: 7128802

Claim:
A manufacturing method of a compressible printing layer, comprising a vulcanizing step comprising: a first heating process in which one surface of a compressible printing layer including an unvulcanized compressible layer containing microcapsules is heated by bringing the one surface of the compressible printing layer into contact with a surface of at least one first heated metal roll while applying tension to the compressible printing layer; and a second heating process in which the other surface of the compressible printing layer is heated by bringing the other surface of the compressible printing layer into contact with a surface of at least one second heated metal roll while applying tension to the compressible printing layer, wherein said microcapsules contain microcapsules having a low melting point and microcapsules having a high melting point, and each of said at least one first heated metal roll and said at least one second heated metal roll has a temperature falling within a range not lower than the melting point of the microcapsules having a low melting point and lower than the melting point of the microcapsules having a high melting point.