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US 10,865,280 B2Granted
Method of producing films from high consistency enzyme fibrillated nanocellulose
AssigneeTeknologian tutkimuskeskus VTT Oy
InventorsVesa Kunnari, Jaakko Pere, Jaakko Hiltunen, Katariina Kemppainen
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Abstract
According to an example aspect of the present invention, there is provided a method of producing films from nanocellulose based raw materials having high consistency and thereby providing low energy consuming and feasible manufacturing process of CNF films and film materials.
Claims12
A method for producing a film from enzyme fibrillated nanocellulose raw material, the method comprising:
- mixing the enzyme fibrillated nanocellulose raw material with additives and forming a fiber web, wherein the enzyme fibrillated nanocellulose raw material comprises a consistency of between 15% and 40%,
- laying the fiber web onto a metal substrate, wherein the laying of the fiber web is carried out by extrusion,
- drying the fiber web on the metal substrate and forming a film material, wherein the film material adheres to the metal substrate to prevent shrinkage of the film material,
- delaminating the film material from the metal substrate,
- rewinding the film material onto a roll, and
- calandering the film material from the roll and forming a film having a desired thickness;
- wherein the additives comprise TEMPO-oxidized cellulose nanofibrils, and wherein the TEMPO-oxidized cellulose nanofibrils are present in an amount of 1-2% by dry weight of the fiber web.
4 more elements
A method for producing a film from enzyme fibrillated nanocellulose raw material comprising:
- mixing an enzyme fibrillated nanocellulose raw material having a consistency of between 15% and 40% with a bio-based polymer to form a fiber web,
- extruding the fiber web onto a metal substrate,
- drying the fiber web on the metal substrate to form a film material, wherein the film material adheres to the metal substrate to prevent shrinkage of the film material, and
- delaminating the film material from the metal substrate to provide the film;
- wherein the bio-based polymer comprises TEMPO-oxidized cellulose nanofibrils, and wherein the TEMPO-oxidized cellulose nanofibrils are present in an amount of 1-2% by dry weight of the fiber web.
2 more elements
Dependencies are inferred from the claim text.