| 摘要 |
The present invention relates to a packaging material made of a multilayer oriented polyolefin film, which comprises a base layer and at least one first outer layer, whereby the first outer layer is placed in contact with itself or in contact with the opposing surface of the film or in contact with the surface of another film. This first outer layer contains an additive which absorbs light within the wavelength range of a laser such that when the film is locally irradiated by the laser, the area of irradiation experiences an increase in temperature that causes the polyolefin of the first outer layer to soften or melt in the irradiated area and to bond to another layer when cooled, whereby the invention is characterized in that said first outer layer additive is present in an amount of 0.01to 10 percent by weight based on the total weight of said first outer layer, and that the average diameter of said aditive particles is in the range of 0.01 to 4 micrometers. |
