Method for manufacturing laser marked polycarbonate film and sheet

Abstract

The invention belongs to the technical field of polycarbonate film processing, and in particular relates to a method for manufacturing a laser marked polycarbonate film and a sheet, which comprises the following steps of: a) mechanical premixing: mixing a pulverized polycarbonate base stock, a laser powder body and an auxiliary agent in a high-speed blender mixer; b) fusion mixing: placing the mixture which is mixed in the high-speed blender mixer into a double-screw extruder, then fusing, mixing and extruding the mixture; c) cooling and pelletizing: cooling the fused mixture after extruding in a water bath at a room temperature and then palletizing the mixture; and d) film forming: processing the processed resin particles into the film or the sheet with a specific surface texture by using a special film forming production line of the polycarbonate. The special-purpose film or the sheet can generate different colors and patterns under the irradiation of the laser beams, can be applied in various aspect cards, identification cards and credit cards, and has the characteristics of environment protection and fast color.

Description

technical field [0001] The invention belongs to the technical field of processing polycarbonate films, in particular to a method for manufacturing laser-marked polycarbonate films and sheets. Background technique [0002] The laser was called "a tool to solve problems" not long after its birth. Scientists realized from the very beginning that something as exotic as a laser would become the most important technological factor of this era. So far, in just a few decades of initial use, lasers have had a major impact on the way we live. [0003] Laser marking technology is one of the largest application areas of laser processing. Laser marking is a marking method that uses a high-energy-density laser to locally irradiate the workpiece to vaporize the surface material or undergo a chemical reaction of color change, thereby leaving a permanent mark. Laser marking can print various characters, symbols and patterns, etc., and the character size can range from millimeters to micro...

AI Technical Summary

Problems solved by technology

[0007] 2. Low definition of marking: the substrate plastic depolymerizes after absorbing a certain amount of laser energy, and the marking is not clear

[0009] 4. Melting leads to darkening of the plastic surface: such marks can only be observed from certain angles