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US 12,612,739 B2Granted
Method for producing a moulded pulp material for packaging unit and such packaging unit
AssigneeHuhtamaki Molded Fiber Technology B.V.
InventorHarald John Kuiper
Life of this patent
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Abstract
A method for producing a moulded pulp material that is suitable for manufacturing of a packaging unit and such packaging unit. The method includes the steps of preparing a raw moulded pulp material, providing the raw moulded pulp material to an extruder, extruding the raw moulded pulp material, adding one or more additives, and providing the moulded pulp material at the outlet of the extruder.
Claims15
A method for producing a moulded pulp material for a packaging unit, the method comprising the steps of:
- preparing a raw pulp material;
- wettening a raw pulp material in a tank;
- providing the raw pulp material to an extruder;
- anionically charging the raw pulp material;
- adding one or more additives;
- extruding the raw pulp material;
- and
- providing the moulded pulp material at the outlet of the extruder,
- wherein adding one or more additives comprises adding a cationic fixative followed by a biodegradable anionic pigment to the raw pulp material,
- wherein a weight ratio of pigment to fixative is in the range of 2-25, and
- wherein extruding the raw pulp material comprises:
- reacting the fixative with cellulose fibers of the raw pulp material;
- and
- attaching the pigment to the cellulose fibers of the raw pulp material.
11 more elements
A method for producing a moulded pulp material for a packaging unit, the method comprising the steps of:
- preparing a raw pulp material;
- wettening a raw pulp material in a tank;
- providing the raw pulp material to an extruder;
- anionically charging the raw pulp material;
- adding one or more additives;
- extruding the raw pulp material;
- and
- providing the moulded pulp material at the outlet of the extruder,
- wherein the additives comprise a biodegradable anionic pigment, wherein the biodegradable anionic pigment is added after adding a fixative, wherein the fixative is a cationic fixative, and wherein the weight ratio of pigment to fixative is in the range of 2-25, and
- wherein extruding the raw pulp material comprises:
- reacting the fixative with cellulose fibers of the raw pulp material;
- and
- attaching the biodegradable anionic pigment to the cellulose fibers of the raw pulp material.
10 more elements
Dependencies are inferred from the claim text.