Process for printing characters or the like on a thermoplastic resin molding

A method of making a thermoplastic resin article having printed indicia fixed on at least one surface thereof, comprising the steps of:

• (a) applying liquid printing media in the form of preselected indicia upon at least one surface of a molded article which consists essentially of a crystalline thermoplastic resin selected from the group consisting of polyester resin, polyacetal resins, polyphenylene sulfide resins and polyamide resins;
• and then
• (b) fixing said applied liquid printing media in the form of said indicia by (i) directing, towards said at least one surface having said applied liquid printing media thereon, a flow of gas at a pressure of between 0.05 to 5 kg/cm.sup.2 and at a temperature between 100.degree. to 300.degree. C. which is greater than a softening temperature of said resin, and (ii) maintaining said directed flow of gas in contact with said at least one surface for a time between 1 to 120 seconds sufficient to dry said applied liquid printing media and to fix the same onto said at least one surface, yet insufficient to cause distortion and/or discoloration of said molded thermoplastic resin article, whereby said thermoplastic resin article having printed indicia thereupon is obtained.