Laser marking of plastics objects of any desired shape with spec

Details Laser marking of plastics objects of any desired shape with spec Laser marking of plastics objects of any desired shape with spec

1990-08-10

1991-12-24

Simmons, David A.

Radiation imagery chemistry: process, composition, or product th

Transfer procedure between image and image layer, image...

Imagewise heating, element or image receiving layers...

264 22, 346 76L, 430945, G03C 800

Patent

active

050751956

ABSTRACT:
A method of laser marking plastics objects of any desired shape, wherein the object to be marked contains a radiation-sensitive additive which effects a change in the light reflectance and is subjected to a laser with pulsed light such that the laser beam is deflected through a mask or directed over the surface of the object to be marked, in conformity with the shape of the marking which is to be applied so as to form a visual effect marking at the areas of impact on said object without the surface of said object suffering damage which is visible to the eye. The method includes using molybdenum disulfide as additive and choosing the laser parameters of wavelength, pulse content and pulse duration such that an effect marking is produced whose contrast undergoes visual change depending on the angle of light and observation.

REFERENCES:
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patent: 4391764 (1983-07-01), Edinger et al.
patent: 4401992 (1983-08-01), Vorst et al.
patent: 4654290 (1987-03-01), Spanjer
patent: 4769310 (1988-09-01), Gugger et al.
patent: 4861620 (1989-08-01), Azuma et al.
patent: 4947750 (1990-08-01), Lewis et al.

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