| 摘要 |
PURPOSE:To prevent elution of a thermally transferrable dye from occurring even when a key cap is exposed to high temperature or a long period of time in the condition wherein a hand cream, a lotion or the like is adhered to the surface of the key cap, by a method wherein a key cap provided with a pattern such as a character and a symbol by a transfer thermal dyeing method is subjected to a dry heat treatment at a temperature at which dyeing can be performed. CONSTITUTION:When the key cap 1 provided with a pattern such as a character and a symbol by a transfer thermal dyeing method is subjected to a dry heat treatment at a temperature at which dyeing can be performed, the molecular motion in the resin at the surface of the base material of the key cap becomes vigorous, resulting in an enlargement of the spacing between molecules, and a molecules of a thermally transferable dye 2 deposited in a surface layer part 3 are diffused into an inner layer part 4. As a result, the dye concentration at the surface layer part 3 is lowered, while that at the inner layer part 4 is increased. and the difference in dye concentration between the two parts becomes comparatively small, resulting in uniformization. |
