TH34880A - Laser marked items And laser marking method - Google Patents

Abstract

DC60 (18/12/41) This invention relates to laser-marked objects having two or more thin films on their surface, one of which is not the outermost layer, a thin film made of a laser-marking base color mixture containing a relatively white inorganic powder that absorbs the laser beam and a binder as essential components; and to the method of laser marking, which involves irradiating the laser-marked object with a laser beam as described in this invention, which may produce a clear white mark on the surface of the object even in the case of low-power laser irradiation or even in the case of high-speed marking. This invention relates to laser-marked objects having two or more thin films on their surface, one of which is not the outermost layer, a thin film made of a laser-marking base color mixture containing a relatively white inorganic powder that absorbs the laser beam and a binder as essential components; and to the method of laser marking, which involves irradiating the laser-marked object with a laser beam as described in this invention, which may produce a clear white mark on the surface of the object even in the case of low-power laser irradiation or even in the case of high-speed marking. Clearly visible on the surface of objects, even in the case of low-power laser illumination or even in the case of high-speed marking.

Claims (13)

1. Laser-marked objects that have two or more thin film layers on their surface, one of which is not the outermost layer, is a thin film made of a laser-marking base color mixture consisting of a relatively white inorganic powder that absorbs the laser beam and a binder as an essential component. 2. Items marked with a laser as defined in Claim 1, which are delivered as labels. 3. Items marked by a laser as defined in Claim 1, which are thin films made of a composite material with a base color for laser marking, with a thickness of 1 to 5 micrometers. 4. Items marked by a laser as defined in Claim 1, which are relatively white inorganic powders, namely polyvalent metal hydroxides, organoaluminum, borate, silicate, phosphate or oxalate. 5. A laser-marked item as defined in Reputation 1, which is a relatively white inorganic powder, exhibits an absorption peak in the infrared absorption spectrum in the range of 900 to 1,000 centimeters. 6. Items marked by a laser as defined in Claim 5, which are organic materials with an absorption peak in the infrared absorption spectrum in the range of 900 to 1,000 cm, namely aluminum hydroxide, mica, or talc. 7. Items marked by a laser as defined in Claim 1, where the binder is a solvent-soluble binder. 8. Items marked by laser as defined in Claim 1, in which the proportion of a relatively white inorganic pigment that absorbs the laser beam is 5 to 95 percent by weight and the proportion of a binder is 2 to 70 percent by weight, both terms relating to the total solid components in the composition of the base pigment for laser marking. 9. The method for laser marking of objects consists of projecting a laser beam onto the object to be laser marked as defined in Claim 1. 10. A method for laser marking as defined in claim 9, whereby the laser beam is an infrared laser. 11. Method for laser marking as defined in Claim 10, whereby such infrared laser is a far-infrared laser. 12. Methods for laser marking as defined in claim 11, where the laser beam has an energy of 0.1 to 1.1 joules/square centimeter. 13. A base color mixture for laser marking containing an inorganic, relatively white pigment that absorbs the laser beam and an adhesive as an essential component (13 claims, 2 pages, - image).