Abstract: The present invention relates to a process for manufacturing a barrier film, wherein the method comprises: —providing an aqueous suspension comprising at least 70 weight-% highly refined cellulose pulp having an SR value of 70-95 and having a content of fibers having a length>0.2 mm of at least 10 million fibers per gram based on dry weight: —forming a wet web; —dewatering and/or drying to form a substrate; —calendering said substrate in at least a first calender nip and a second calender nip; —providing said substrate with at least one first layer of a barrier chemical to form a coated substrate, wherein each first layer has a coat weight of 0.5-5 gsm, and wherein a total coat weight on of the first layers is ?8 gsm, and—drying to form said barrier film having a thickness of <50 ?m. The invention relates also to a barrier film, a barrier film laminate with a polymer layer and a packaging material comprising the barrier film.

Abstract: The present invention is directed to a film or coating comprising a fiber material, wherein at least 60% by weight of said fiber material is microfibrillated cellulose, said film or coating also comprising at least 1% by weight of extractives from wood bark or cork wood. The invention is also directed to products, such as packaging materials, using or incorporating said film or coating. Such packaging materials are for example laminates or multi-layer structures. The films or coatings according to the present invention having advantageous barrier properties and are therefore particularly suitable for sensitive objects that need to be packaged in a controlled or modified atmosphere. The present invention is also directed to a composition comprising a fiber material, wherein at least 60% by weight of said fiber material is microfibrillated cellulose, said composition also comprising at least 1% by weight of extractives from wood bark or cork wood.

Abstract: The present invention relates to a method for manufacturing at least one layer of a film wherein the method comprises the steps of; providing a first suspension comprising microfibrillated cellulose, providing a second suspension comprising microfibrillated dialdehyde cellulose, mixing the first suspension with the second suspension to form a mixture, applying said mixture to a substrate to form a fibrous web and drying said web to form at least one layer of said film. The present invention further relates to a film comprising said at least one layer.

Abstract: A method for the production of highly refined or microfibrillated cellulose (MFC), comprising the steps of treating cellulosic fibres to remove at least a major part of the primary wall of the fibres, drying the treated fibres, rewetting the treated fibres, and disintegrating the wetted fibres by mechanical means to obtain the final product. Dried cellulosic pulp is produced as an intermediate product of the method, having an average fibre length of at least 0.4 mm, while less than 50% of the primary wall material of natural untreated fibres is left in the intermediate product. Instead of transporting large amounts of dilute MFC dispersion the invention enables transport of the dry intermediate product to the MFC end user, who would complete the process by turning the intermediate product to final MFC by use of standard disintegrating devices.

Abstract: The present invention relates to a method for manufacturing at least one layer of a film wherein the method comprises the steps of; providing a first suspension comprising microfibrillated cellulose, providing a second suspension comprising microfibrillated dialdehyde cellulose, mixing the first suspension with the second suspension to form a mixture, applying said mixture to a substrate to form a fibrous web and drying said web to form at least one layer of said film. The present invention further relates to a film comprising said at least one layer.

Abstract: The invention relates to methods of producing microfibrillated cellulose (MFC). According to the invention a fibrous pulp suspension is fibrillated mechanically at a consistency of less than 12.5%, dewatered to raise the consistency of the fibrillated suspension to at least 12.5%, and then subjected in the dewatered condition to further fibrillation. Alternatively an initially fibrillated fibrous pulp suspension may be dewatered and fibrillated in the dewatered condition, after which these dewatering and fibrillating steps are repeated one or more times so that pulp consistency is increased for each fibrillation step. The goals of raising the consistency between subsequent fibrillations are energy saving and an increased aspect ratio in MFC. The invention even comprises uses of the MFC product, e.g. as an additive for papermaking furnish or injection molded plastic composites.

Abstract: The invention relates to methods of producing microfibrillated cellulose (MFC). According to the invention a fibrous pulp suspension is fibrillated mechanically at a consistency of less than 12.5%, dewatered to raise the consistency of the fibrillated suspension to at least 12.5%, and then subjected in the dewatered condition to further fibrillation. Alternatively an initially fibrillated fibrous pulp suspension may be dewatered and fibrillated in the dewatered condition, after which these dewatering and fibrillating steps are repeated one or more times so that pulp consistency is increased for each fibrillation step. The goals of raising the consistency between subsequent fibrillations are energy saving and an increased aspect ratio in MFC. The invention even comprises uses of the MFC product, e.g. as an additive for papermaking furnish or injection molded plastic composites.

Abstract: A method for drying nanofibrillated polysaccharide to obtain a substantially dry nanofibrillated polysaccharide product, comprising the following steps: (i) providing an aqueous suspension of nanofibrillated polysaccharide; (ii) increasing the solid content of said suspension, thereby forming a high solid content microfibrillated cellulose suspension; and (iii) drying said high solid content microfibrillated cellulose suspension, through a simultaneous heating and mixing operation.

Abstract: The present invention provides a method for production of cellulose ethers in a high solids process substantially without use of organic solvents as reaction and/or washing medium. In the method of the invention the first alkalization step is carried out by using high solids content cellulose pulp and solid sodium hydroxide. This is followed by an etherification step where the solids content is preferably further increased and the use of solid etherification reactant is preferred. As no organic solvents are used as reaction media the invented method enables production of cellulose ethers directly from never dried pulp with significant savings in energy and investment costs. The method is especially suitable for the production of carboxymethyl cellulose sodium salt (CMC) with low degree of substitution (DS<0.3). The use of the resulting none or low water soluble carboxymethylated cellulosic fibres is suitable for example for producing microfibrillated cellulose.