Method of making a plastic material sensitive to laser radiation and enabling it to be marked by a laser, and articles obtained thereby
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United States of America Patent
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Mar 28, 1989
Grant Date -
N/A
app pub date -
Apr 9, 1986
filing date -
Apr 12, 1985
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An opacifier substance is added to a plastic material which is naturally transparent to laser radiation. The opacifier substance is added in powder form as a concentration of 2% to 6% by weight of the plastic material. The opacifier substance is preferably antimony oxide and the resulting plastic material is capable of being permanently marked by a laser beam and is suitable for providing animal ear tags. These tags may be marked with an automatically readable bar code and this code continues to be automatically readable over a period of several years use on the animal.
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