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US 11,047,091 B2Granted
Cellulose based film structure and method for producing the same
AssigneeTeknologian tutkimuskeskus VTT Oy
InventorsRiku Pihko, Vesa Kunnari
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Abstract
According to an example aspect of the present invention, there is provided a cost-effective method of producing cellulose based films by introducing an intense water removal system to the process, and cellulose based films thereof having improved properties.
Claims12
A method for producing continuous cellulose nanofibril (CNF) or cellulose microfibril (CMF) film, wherein the method comprises the steps of:
- casting a CNF or CMF material layer comprising a CNF or CMF material onto a metal belt, fabric or felt having total length of 10 to 150 m, wherein a bottom side of the CNF or CMF material layer is in contact with the metal belt, fabric or felt,
- producing a strengthening layer on a top side of the CNF or CMF material layer before, after or simultaneously with the casting, wherein the top side is opposite the bottom side of the CNF or CMF material layer, wherein the strengthening layer comprises longer fibers than the CNF or CMF material and at least one filler material, and wherein the strengthening layer is thinner than the CNF or CMF layer,
- removing at least 30% of the moisture of the CNF or CMF material, and
- final drying and reeling of the formed film.
1 more element
A method for producing continuous cellulose nanofibril (CNF) or cellulose microfibril (CMF) film, wherein the method comprises:
- casting a CNF or CMF material layer comprising a CNF or CMF material onto a metal belt, wherein the CNF or CMF material layer and the metal belt each comprise a top side and an opposed bottom side, and wherein the bottom side of the CNF or CMF material layer contacts the top side of metal belt,
- removing moisture from the CNF or CMF material, wherein the removing comprises:
- applying an amount of steam to the bottom side of the metal belt to transfer heat to the CNF or CMF material layer;
- and
- drying the CNF or CMF material layer by directing an air flow to the top side of the CNF or CMF material layer.
2 more elements
Dependencies are inferred from the claim text.