Patents Assigned to LPF Verpakkingen B.V.
  • Method of forming lines of weakness in or grooving a plastic material, especially a packaging material
    Patent number: 5010231
    Abstract: A method of forming lines of weakness in or grooving a plastic material, especially a packaging material, by local vaporization or degradation by means of a laser beam, which laser beam and which plastic or packaging material can be moved in relation to each other, wherein the laser beam is generated by means of a wavelength tunable laser tuned to a wavelength selected on the basis of the wavelength depending absorption spectrum of the material to be processed.
    Type: Grant
    Filed: May 17, 1990
    Date of Patent: April 23, 1991
    Assignee: LPF Verpakkingen B.V.
    Inventor: Gert J. Huizinga
  • Method of providing score lines in packaging material
    Patent number: 5001325
    Abstract: A method of providing score lines in packaging material by local evaporation using a laser beam, wherein the laser beam and the packaging material are movable relative to each other. The score lines are provided in a recurring pattern on at least one side of a web of packaging material as it advances at a uniform, adjustable speed. The intensity of the laser beam is adjustable, and the laser beam is moved in two mutually perpendicular directions under the control of pattern-dependent signals.
    Type: Grant
    Filed: August 31, 1989
    Date of Patent: March 19, 1991
    Assignee: LPF Verpakkingen B.V.
    Inventor: Gert J. Huizinga