Method of providing score lines in packaging material
AssigneeLPF Verpakkingen B.V.
InventorGert J. Huizinga
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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.
Claims4
A method for providing score lines in single or multi-layered thin film packaging material through local evaporation of a portion of said material using a controllable laser beam, said method comprising the steps of:
- advancing a web of thin-film packaging material at a uniform adjustable speed in a web path past a first laser beam directed onto a first side of said web so as to locally evaporate material from said first side thereby forming score lines thereon, wherein said web has a recurring pattern of printed images appearing on one side thereof;
- moving said first laser beam in two mutually perpendicular directions in the web path from a fixed point in response to pattern dependent control signals, said signals defining a path of said score lines to be provided on said first side and in registration with said pattern and being responsive to the speed of said web;
- and
- adjusting a focal length of said first laser beam so that the focus of the first laser beam is maintained on the first side of said web while said score lines are being formed thereon.
Dependencies are inferred from the claim text.