An experimental system for studying a refining mechanism and characteristic of a refiner plate, including a disc refiner unit, a first storage tank, a second storage tank, a circulating pump, a pipeline system, a detection device for measuring process variables including flow, pressure and temperature, and a data acquisition and control system. An operation parameter control system is provided to control an operation state of valves at different positions of the pipeline system to achieve the switching of the operation mode of the experimental system. The data acquisition and control system is configured to collect the parameters at different detection points. A method for operating the experimental system is also provided.

The present invention is directed to a method of transforming a pulp fibrous into a pre-dispersed semi-dry or dry fibrous material and to the material produced. The method opens, de-entangles and fibrillates the fibrous material of the input pulp. The method mixes the input fibrous with chemicals while evaporating moisture in an updated mechanical disc refiner process. The refiner operates to set three process variables: 1) applied refining specific energy; 2) refiner gap opening and 3) refiner output consistency. Depending on the feed pulp type and consistency, the refiner's output is a pre-dispersed semi-dry fibrous material of 30 to 99% solids with 70 to 100% of separated fibers that depending on chemical treatment are loosely entangled fibrous that disperse in water using common techniques. The pre-dispersed semi-dry output may be further processed inline or by batch process air agitation at velocities sufficient to further separate fibers and loosen fibrous entanglements.

A method of producing conifer-derived pulp fibers for paper includes a beating step of beating conifer-derived material pulp fibers in the presence of a liquid including water; and an ozone treatment step of treating, with ozone water, the beaten conifer-derived material pulp fibers.

The present invention relates to a process for the production of suspensions of nano-fibrillar cellulose by providing cellulose fibres and at least one filler and/or pigment; combining the cellulose fibres and the at least one filler and/or pigment; and fibrillating the cellulose fibres in the presence of at least one filler and/or pigment, as well as the suspensions of nano-fibrillar cellulose obtained by this process and their uses.

The present invention relates to a process for the production of suspensions of nano-fibrillar cellulose by providing cellulose fibres and at least one filler and/or pigment; combining the cellulose fibres and the at least one filler and/or pigment; and fibrillating the cellulose fibres in the presence of at least one filler and/or pigment, as well as the suspensions of nano-fibrillar cellulose obtained by this process and their uses.

A refining member comprising a refining body with a refining surface comprising first and second refiner bars separated by first and second refiner grooves, respectively. The first refiner bars extend from a radially inward position to a first radially outward position. The second refiner bars extend to a second radially outward position that is nearer to an outermost part of the refining body than the first radially outward position. The second refiner bars have a longitudinal length from about 0.6 cm to about 10 cm. The first and second refiner bars have a respective first and second maximum height extending upward from a floor of a respective, adjacent first or second refiner groove. The second maximum height is at least 0.35 mm less than the first maximum height. The first refiner bars are adapted to refine wood fibers and the second refiner bars are adapted to break up fiber bundles.

Disclosed herein is a mixture comprising at least one carbohydrate-active enzyme, at least one liquid natural polymer, and optionally at least one strength agent. The mixture is useful in methods of making paper or board and methods of improving refinability and/or strengthening potential of paper pulp for use in a paper or board mill. In such methods the mixture is added to a cellulosic material containing pulp slurry in the process of making paper or board products.

The invention discloses a method for preparing chitosan and a derivative nanofiber thereof by mechanical means. The method comprises: firstly pre-treating a chitosan fiber or a chitosan derivative fiber material (referred to as chitosan fiber) of a suitable length with water or alkali or acid of an appropriate concentration added, then refining or beating the treated fiber (preferably using a beating device in a beating and papermaking process) to obtain a micro-sized chitosan fiber, and finally homogenizing the micro-sized chitosan fiber under a high pressure to obtain a chitosan nanofiber. According to an electron microscope image, the obtained chitosan nanofiber reaches a nano-level. The method is simple in operation and convenient for industrial production, and the obtained chitosan nanofiber with a new topology has broad application prospects in biomedicine, daily chemical engineering and special materials.

A fiber blend includes a first amount of wood pulp fibers refined in an amount of at least about 150 kWh per metric ton of gross refining energy, and a second amount of wood pulp fibers refined in an amount of at most about 10 kWh per metric ton of gross refining energy.

An arrangement and a method for adjusting a blade gap in a refiner. The arrangement comprises at least one loading device arrangeable to move at least one refining element of the refiner in respect of at least one another refining element of the refiner for adjusting the blade gap between the refining elements, at least one vibration measuring device for measuring a vibration of the refiner in operation, and at least one control unit configurable to adjust the blade gap between the refining elements by controlling the at least one loading device to move the at least one refining element in respect of the at least one another refining element based on the measured vibration of the refiner.