Patent ID: 9248622
Filing Date: 2016-02-02
CPC Classification: B29C,B29K,B29L,B31B

Claim Text:
1. A method for sealing a polymer-coated fibre-based material to a counter-surface, comprising: providing a multilayer polymer coating disposed on a fibre layer of the material with a radiation-absorbing light-shielding pigment dispersed in an inner polymer coating layer adjacent to a transparent outer polymer coating layer, said pigment being dispersed over the entire area of said inner polymer coating layer, selecting a sealing area as a portion of the area of said fibre-based material with the pigmented coating, directing a laser beam of wavelength not greater than 1500 nm from a diode or Nd:YAG laser source to said fibre layer of the material, said fibre layer having a weight of 210-420 g/m said second part of the laser beam absorbed by the pigment heat-melts polymer of said pigmented inner polymer coating layer and said transparent outer polymer coating layer present at the sealing area and seals the polymer-coated fibre-based material to said counter-surface.