| 摘要 |
The invention concerns a method of marking articles having a polyolefin surface by exposure to a laser beam. The polyolefin contains a sufficient amount of a laser radiation absorbing substance for decomposing the polyolefin so that a black mark of decomposed polyolefin will be formed. <??>The laser radiation absorbing substance is a silicon compound, preferably a metal silicate, e.g. calcium-metasilicate or kaoline. <??>The invention also comprises an article having a polyolefin surface provided with a black mark of decomposed polyolefin formed by a laser beam. |
