Stora Enso OYJ

The present invention relates to a biopolymer adhesive system where its parts contain bio-based components and a method of separately applying said parts of the biopolymer adhesive system, wherein the viscosity and distance between the parts are specified to certain parameters when applying onto substrate and usage thereof.

The present invention relates to a multilayer barrier film for a paper or paperboard packaging material, said barrier film comprises a first layer comprising a furnish comprising at least 70 wt-% of highly refined cellulose based on the total fiber content of the first layer, a second layer comprising a furnish comprising cellulosic fibers and less than 50 wt-% of highly refined cellulose based on the total fiber content of the second layer wherein the multilayer barrier film has an air permeance above 1000 pm/Pas and a tear index GM above 4.5. The present invention further relates to a paper and paperboard based packaging material comprising such multilayer barrier film and to methods for manufacturing such multilayer barrier film.

The present invention relates to a method for manufacturing a film comprising highly refined cellulose fibers in a paper-making machine, the method comprising the steps of: a) forming a wet web by applying a pulp suspension comprising at least 50% b dry weight of highly refined cellulose fibers having a Schopper-Riegler (SR) value in the range of 80-100 from a headbox onto a moving wire and partially dewater the web on the wire; and b) feeding the partially dewatered web from the wire into a dewatering nip formed between a suction roll and a lump breaker roll to further dewater the wet web, c) optionally further dewatering the web from the dewatering nip in a press section and drying the web in a drying section to obtain a film comprising the highly refined cellulose fibers.

The present invention relates to an arrangement for determining the permeability of a sample, said arrangement comprising a source of fluid medium arranged such that at least a fraction of said medium can be brought into contact with a first surface of said sample to be tested; means for measuring the electrical properties at a second surface of said sample, wherein the second surface is opposite said first surface of said sample; and a controller for recording said electrical properties, and for determining the transmission rate of the fluid medium through the sample based on the recorded electrical properties.

The present invention relates to a method for manufacturing a barrier film comprising highly refined cellulose, said method comprising: a) providing a highly refined cellulose pulp suspension comprising highly refined cellulose pulp having a Schopper-Riegler (SR) number in the range of 40-98 as determined by standard ISO 5267-1 and a content of fibers having a length >0.2 mm of at least 7 million fibers per gram based on dry weight, at a consistency in the range of 0.1-1.5 wt %; b) forming a web of the highly refined cellulose pulp suspension and dewatering the web in a paper machine former on a wire to a consistency of at least 5 wt % to obtain a substrate web, wherein the white water removed from the pulp contains 2-25 wt %, preferably 5-20 wt % and more preferably at least 5-15 wt % of the solids of the highly refined cellulose pulp suspension provided in step a); c) optionally further dewatering and optionally drying the substrate web; d) coating the optionally further dewatered and optionally dried substrate web with a coating suspension comprising cellulose fines or microfibrillated cellulose to obtain a coated web; and e) dewatering and/or drying the coated web to obtain a barrier film comprising highly refined cellulose.

The present invention relates to a method for reducing the load of microbial contaminants in a pulp stock comprising a recycled fiber fraction, said method comprising the following steps performed in sequence: a) providing a pulp stock comprising a recycled fiber fraction at a consistency in the range of 2-10 wt % in water; b) adding a basic oxide selected from the group consisting of calcium oxide (CaO) and sodium oxide (Na2O) to the pulp stock and allowing the basic oxide to react with water to form the corresponding hydroxide, wherein the amount of the basic oxide added is sufficient to raise the pH value of the pulp stock to above 12.5 and to maintain the pH value of the pulp stock above 12.5 for at least 60 minutes; c) allowing the pulp stock to remain at a pH value above 12.5 for at least 60 minutes; and d) adding an organic oxidative acid to the pulp stock, wherein the amount of the organic oxidative acid added is sufficient to reduce the pH value of the pulp stock to below 10.

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. The composition is useful for example in the preparation of the film or coating.

The present invention relates to a method of forming at least one compressed region in a solid cellulose foam, said method comprising the step of: a) Providing a solid cellulose foam; b) Providing at least one cutting line of a predetermined depth of cut into at least one surface of said solid cellulose foam, whereby the at last one cutting line defining at least one pattern on said at least one surface; and c) Pressing at least one pressing tool into said at leas one pattern of said at least one surface of said cellulose foam thereby forming at le st one compressed region. The invention further relates to a solid cellulose foam product formed by the method.

A packaging insert ( 10 ) comprises multiple cellulose-based air-laid or solid foam substrates ( 20 , 20 A, 20 B, 20 C) having respective first and second main sides ( 22 , 22 A, 22 B, 22 C, 24 , 24 A, 24 B, 24 C). The packaging insert ( 10 ) also comprises a first paper-based sheet ( 30 ) attached to the first main sides ( 22 , 22 A, 22 B, 22 C) and a second paper-based sheet ( 40 ) attached to the second main sides ( 24 , 24 A, 24 B, 24 C). Edges ( 26 , 26 A, 26 B, 28 , 28 B, 28 C) of consecutive cellulose-based air-laid or solid foam substrates ( 20 , 20 A, 20 B, 20 C) facing each other are beveled edges ( 26 , 26 A, 26 B, 28 , 28 B, 28 C) and form an angle (a) between each other that is less than 90°. At least one hinge section ( 50 , 50 A, 50 B) is interposed between the beveled edges ( 26 , 26 A, 26 B, 28 , 28 B 28 C) of the consecutive cellulose-based air-laid or solid foam substrates ( 20 , 20 A, 20 B, 20 C). The packaging insert ( 10 ) is foldable in the hinge section(s) ( 50 , 50 A, 50 B) and can be positioned within a packaging ( 80 ) to protect packaged goods. The invention also relates to a method of producing a packaging insert ( 10 ).

The present invention relates to a method for manufacturing a multilayer film comprising highly refined cellulose fibers, the method comprising the steps of: a) forming a first wet web by applying a first pulp suspension comprising highly refined cellulose fibers on a first wire; b) partially dewatering the first wet web to obtain a first partially dewatered web; c) forming a second wet web by applying a second pulp suspension comprising highly refined cellulose fibers on a second wire; d) partially dewatering the second wet web to obtain a second partially dewatered web; e) joining the first and second partially dewatered web to obtain a multilayer web; and f) further dewatering, and optionally drying, the multilayer web to obtain a multilayer film comprising highly refined cellulose fibers.