Double corona treatment
AssigneeTetra Laval Holdings & Finance S.A.
InventorRicardo Miranda
Life of this patent
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Abstract
A method and apparatus for producing a polyethylene coated paperboard material with a mirror-pocket finish and a predetermined Dyne level is disclosed herein. The apparatus and method utilizes a double corona treatment on a single polyethylene surface to create the material with the predetermined Dyne level. Such paperboard material is often used for fabrication of cups, and the like. The predetermined Dyne level is required for printing requirements. The method and apparatus allow for the production of the predetermined Dyne level material at standard laminator operating speeds.
Claims5
A method for producing a polymer coated paperboard material with a predetermined Dyne level, the method comprising:
- processing a paperboard material through a laminator at a predetermined speed, the paperboard material having a first surface and a second surface;
- extruding a first polymer onto the first surface of the paperboard material;
- treating a surface of the first polymer layer of the paperboard material with a first corona treatment to a Dyne level of about 38;
- extruding a second polymer layer onto the second surface of the paperboard material subsequent to treating the surface of the first polymer layer;
- and
- treating the surface of the first polymer layer of the paperboard material with a second corona treatment to a Dyne level of about 42 to about 44 subsequent to the first corona treatment;
- whereby the first corona treatment and the second corona treatment impart the predetermined Dyne level to the surface of the first polymer layer of the paperboard material.
Dependencies are inferred from the claim text.