The present invention relates to a refined cellulose fiber composition useful as a strength enhancing agent for paper and paperboard, wherein the refined cellulose fiber composition has a Schopper-Riegler (SR) number in the range of 80-98 as determined by standard ISO 5267-1, and wherein the refined cellulose fiber composition has a content of fibers having a length >0.2 mm of at least 12 million fibers per gram based on dry weight. The invention further relates to a method for preparing the refined cellulose fiber composition and to pulp paper and paperboard comprising the refined cellulose fiber composition.

A cellulose nanofibrils production method comprising the steps of: identifying a desired level of cellulose nanofibrils pulp purity, partially refining pulp to produce a cellulose nanofibrils pulp purity between 5% and 15% less than the desired desired purity, and then separating out the cellulose nanofibrils from the longer fibers to produce the desired level of cellulose nanofibrils pulp purity.

Textile fibers of different lengths are fractionated in a liquid medium at a predetermined consistency into at least two fractions on the grounds of the fiber length, the two fractions being a first accept and a second accept. The second accept, which has longer fibers than the first accept, is led to a refining step in the liquid medium, and the refined fibers are fractionated in the liquid medium into at least two fractions on the grounds of the fiber length.

The present invention relates to a cellulose-based gas barrier film, said cellulose-based gas barrier film comprising at least 50 wt % of a fines-depleted highly refined cellulose pulp (FD-HRC), wherein said FD-HRC has a Schopper-Riegler (SR) number in the range of 80-100 as determined by standard ISO 5267-1, wherein said FD-HIRC has an amount of long (>0.2 mm) fibers of at least 8 million fibers per gram (based on dry weight), and wherein said FD-HRC has a Fines A value below 46%, wherein the Fines A value is determined using an FS5 optical fiber analyzer. The present invention relates to a method for manufacturing said cellulose-based gas barrier film.

The invention relates to a process and an apparatus for producing a molded fiber article. The process comprises the steps of dissolving fibrous materials in water to form a fibrous material suspension in a pulper, removing moisture from the fibrous material suspension by pressing to form a molded fiber article in a mold and/or drying the molded fiber article by supplying heat, demolding the molded fiber article from the mold. The process is characterized by the feature whereby, in mold drying of the molded fiber article in the mold, a moisture content of the molded fiber article of not more than 10% by weight or not more than 7.5% by weight or not more than 5% by weight is achieved.

The invention relates to a process and an apparatus for producing a molded fiber article. The process comprises the steps of dissolving fibrous materials in water to form a fibrous material suspension in a pulper, removing moisture from the fibrous material suspension by pressing to form a molded fiber article in a mold and/or drying the molded fiber article by supplying heat, demolding the molded fiber article from the mold. The process is characterized by the feature whereby, in mold drying of the molded fiber article in the mold, a moisture content of the molded fiber article of not more than 10% by weight or not more than 7.5% by weight or not more than 5% by weight is achieved.

Disclosed is a pulp dissolving device and a pulp dissolving method for refined cotton. The device includes a supporting base. A pulp dissolving unit A is installed on the top of the supporting base, and a pulp discharging unit is installed in front of the pulp dissolving unit A. A pulp dissolving unit B is installed on the right side of the pulp dissolving unit A, and a pulp dissolving unit C is installed on the pulp dissolving unit A and the pulp dissolving unit B. The number of stirring shafts is two, and the two stirring shafts are rotationally installed on a pulp dissolving frame. The number of stirring supports is two rows, and the two rows of stirring supports are welded to the outside of the two stirring shafts.

Disclosed is a pulp dissolving device and a pulp dissolving method for refined cotton. The device includes a supporting base. A pulp dissolving unit A is installed on the top of the supporting base, and a pulp discharging unit is installed in front of the pulp dissolving unit A. A pulp dissolving unit B is installed on the right side of the pulp dissolving unit A, and a pulp dissolving unit C is installed on the pulp dissolving unit A and the pulp dissolving unit B. The number of stirring shafts is two, and the two stirring shafts are rotationally installed on a pulp dissolving frame. The number of stirring supports is two rows, and the two rows of stirring supports are welded to the outside of the two stirring shafts.

A fiber processing system includes a fiber processing unit having an inlet, accepts outlet, and solid discharge outlet and configured to remove solid contaminants from a fiber-containing stream to produce an accepts stream exiting the accepts outlet and a solid discharge stream exiting the solid discharge outlet. The fiber processing system includes an optical system having an imaging device and image processing system. The imaging device is configured to capture images of the solid discharge stream at or downstream of the solid discharge outlet, and the image processing system is configured to determine relative fiber content, a relative generation rate, types of materials in, or combinations thereof of the solid discharge stream from the captured images. The fiber content, generation rate, and/or types of materials of the solid discharge stream are used to control operation of the fiber processing system or other upstream pulp processing equipment.