- - Printing Method by change of optical property of plastics through crystallization and the ink-free label-free plastic product thereof

摘要

The present invention relates to a method of printing plastic products by changing the optical properties of plastics through crystallization, and ink-free and label-free plastic products printed by the method, and more particularly, to a part of the plastic material that has not been crystallized. It provides a method for printing a plastic product, comprising the step of crystallizing and printing, and an ink-free and label-free plastic product thereby. According to the present invention, characters, pictures, logos, etc. can be printed through crystallization of a plastic material, and since printing is possible without using ink, recycling can be facilitated and the amount of plastic used can be reduced by reducing label production. can be reduced