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.
Claims14
A method for producing continuous cellulose nanofibril (CNF) or cellulose microfibril (CMF) film, wherein the method comprises the steps of:
- casting of CNF or CMF material layer onto a metal belt, fabric or felt having total length of 10 to 150 m,
- removing at least 30% of the moisture of the CNF or CMF material by an intense water removal system, and
- final drying and reeling of the formed film.
A CNF or CMF film having a thickness of 10-100 μm, comprising a strengthening layer having fibers of length of 0.1 to 1 mm, wherein thickness of the strengthening layer is 5 to 20 μm.
A CNF or CMF film having a thickness of 10-100 μm, comprising a strengthening layer having fibers of length of 0.1 to 1 mm, wherein thickness of the strengthening layer is 5 to 20 μm, and wherein the film is produced by a method comprising the steps of:
- casting of CNF or CMF material layer onto a metal belt, fabric or felt having total length of 10 to 150 m,
- removing at least 30% of the moisture of the CNF or CMF material by an intense water removal system, and
- final drying and reeling of the formed film.
(canceled)
Dependencies are inferred from the claim text.