Packaging material made of a biaxially oriented polyolefin film

Details Packaging material made of a biaxially oriented polyolefin film Packaging material made of a biaxially oriented polyolefin film

B - Operations, Transporting

32

B

B32B 27/32 (2006.01) B29C 65/16 (2006.01) B65D 65/40 (2006.01)

Patent

CA 2394143

The 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.

L'invention concerne un emballage à base d'une pellicule en polyoléfine à orientation multicouche, qui comprend une couche de base et au moins une première couche de couverture. Cette première couche de couverture est en contact avec elle-même ou avec la surface opposée de la pellicule ou avec la surface d'une autre pellicule. Cette première couche de couverture contient un additif qui présente, dans la plage de longueur d'ondes d'un laser, une telle absorption qu'en cas d'exposition locale de la pellicule au rayonnement dudit laser, la température augmente à un tel niveau dans la zone d'exposition, que la polyoléfine de la première couche de couverture ramollit ou fond dans la zone exposée et se lie, pendant le refroidissement, à une autre couche.

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