Method of producing a pulp product
AssigneeCelwise AB
InventorDavid Pierce
Life of this patent
Estimating the term…
Abstract
A method of producing a 3D molded product comprises applying a pulp slurry layer to a porous forming face of a first mold, pressing the pulp slurry layer against the porous forming face of the first mold, while heating the pulp slurry layer and drawing a vacuum through the porous forming face of the first mold, transferring the pulp slurry layer to a porous forming face of a second mold, in a subsequent forming step, pressing the pulp slurry layer against the porous forming face of the second mold, while heating the pulp slurry layer and drawing a vacuum through the porous forming face of the second mold. In the method, a first pressure at the rear side of the forming face of the porous forming face of the first mold is lower than a second pressure at the rear side of the porous forming face of the second mold.
Claims20
A method of producing a 3D molded product from a pulp slurry, comprising:
- providing a first mold comprising a porous wall portion through which a vacuum can be drawn, the porous wall portion having a porous forming face and a rear face,
- providing a second mold comprising a porous wall portion through which a vacuum can be drawn, the porous wall portion having a porous forming face and a rear face,
- applying a pulp slurry layer to a porous forming face of the first mold,
- in a first forming step, pressing the pulp slurry layer against the porous forming face of the first mold with a pressing tool, while heating the pulp slurry layer and drawing a vacuum through the porous forming face of the first mold by applying a first pressure to the rear face of first mold,
- transferring the pulp slurry layer to the porous forming face of the second mold,
- in a second, subsequent, forming step, pressing the pulp slurry layer against the porous forming face of the second mold with a pressing tool, while heating the pulp slurry layer and drawing a vacuum through the porous forming face of the second mold by applying a second pressure to the rear face of second mold,
- wherein the first pressure at the rear face of the first mold is lower than the second pressure at the rear face of the second mold, and
- wherein the first pressure is from about 22.2% to about 88.5% of the second pressure.
Dependencies are inferred from the claim text.