| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a method in which a cured film excellent in adhesion can be formed by enough curing an ultraviolet curable ink of white color on a resin substrate low in heat resistance. <P>SOLUTION: The curing method includes a process of obtaining a UV cured film by irradiating a layer which includes the ultraviolet curable ink of white color formed on the resin substrate with ultraviolet rays, a first heating process of obtaining a heated cured film by heating the UV cured film at a first temperature t1 higher than the softening point (tm) of the resin substrate and lower than the continuous heat-resisting temperature of the resin substrate for a first heating time s1, a second heating process of enhancing the adhesion between the heated cured film and the resin substrate by heating the heated cured film at a second temperature t2 for a second heating time s2, and a third heating process of giving a deformation resistance to the resin substrate by heating at a third temperature t3 for a third heating time s3 after the second heating. The first, second and third temperatures satisfy tm<t3<t2<t1. The first, second and third times satisfy s3>s2>s1. <P>COPYRIGHT: (C)2013,JPO&INPIT |
