DYEING METHOD OF THE DEPRESSED AND PROMINENT SURFACE OF A PRODUCT OF A POLY URETHANE FOAM MATERIAL FOR SIMPLY DYEING CHARACTERS OR FIGURES ON THE CURVED SURFACE OR DEPRESSED AND PROMINENT SURFACE OF THE PRODUCT

摘要

PURPOSE: A dyeing method of the depressed and prominent surface of a product of a PU(Poly Urethane) foam material is provided to enable dyeing although the surface of a product is a curved or depressed and prominent surface and to prevent dyed characters or figures from being erased. CONSTITUTION: A dyeing method of the depressed and prominent surface of a product of a PU foam material comprises steps of indicating characters or figures on the top surface of a PU film(101); covering a lower mold with the PU film in a state of having the dyed surface of the PU film as the top surface(102); injecting a PU foam liquid into the dyed surface of the PU film put on the lower mold(103); integrally combining the lower mold with an upper mold(104); foaming the PU foam liquid by heating the upper and lower molds and adhering the dyed surface of the PU film closely to the surface of the product(105); and separating the upper and lower molds in which the PU-foamed product is inserted and withdrawing and then finishing the PU-foamed product(106).