Patent ID: 8790478

Claim:
A transfer printing method for printing images on a workpiece with supercritical fluid, the transfer printing method comprising: disposing the workpiece inside a first mold and disposing a transfer film above the workpiece; closing the first mold with a second mold and injecting pressurized gas, whose pressure is greater than a critical pressure, into the first mold and the second mold; ensuring a temperature of the pressurized gas being greater than a critical temperature so as to convert into supercritical fluid; softening the transfer film with the supercritical fluid; discharging the pressure inside the first mold for generating a pressure drop between the first mold and the second mold so as to paste the transfer film on the workpiece after softening the transfer film with the supercritical fluid; transferring an adhesive layer, a print layer and a hardening layer of the transfer film onto the workpiece; and opening the first mold and the second mold to take out the workpiece.