A method of and an arrangement for adding a chemical to an approach flow system of a fiber web machine by mixing of a retention chemical to a fibrous stock flowing in an approach flow system of a fiber web machine by a mixer (200) between the attenuator (16) and the headbox (18).

The invention relates to a method for treating biomass (1). In a step (S10) of the method, the biomass (1) and an amount of water (2) is fed into a first reactor unit (10) such that the biomass (1) is impregnated using the amount of water (2) while the biomass (1) is transferred through the first reactor unit (10) by a conveyor means (11). In another step (S20), the impregnated biomass (22) is transferred from the first reactor unit (10) to a separation unit (20) in which at least a part (21) of the amount of water (2) used for impregnation can be separated from the impregnated biomass (22). In another step (S30), the impregnated biomass (22) is transferred from the separation unit (20) into a second reactor unit (30) in which the impregnated biomass (22) is subjected to a predetermined pressure (S30). The invention further relates to the use of the method for treating non-wood material as well as to a device for treating biomass (1).

The invention pertains to a device and a process for the production of nanofibers, in particular, nanocellulose from a fiber-containing mixture of substances, whereby the device is formed including at least one discharge element with a discharge opening for the passage of a fiber-containing mixture of substances, at least one feeding device for the supply of the fiber-containing mixture of substances to the discharge element with a predeterminable process pressure, at least one positioning device for the positioning of the discharge element and whereby, for the disintegrating of the fiber-containing mixture of substances, a moveable processing body is arranged opposite relative to at least one discharge element whereby on the passage of the fiber-containing mixture of substances through the discharge element a slit-like processing area is formed between the discharge element and the substance mixture-affected partial surface of the moveable processing body.

The invention pertains to a device and a process for the production of nanofibers, in particular, nanocellulose from a fiber-containing mixture of substances, whereby the device is formed including at least one discharge element with a discharge opening for the passage of a fiber-containing mixture of substances, at least one feeding device for the supply of the fiber-containing mixture of substances to the discharge element with a predeterminable process pressure, at least one positioning device for the positioning of the discharge element and whereby, for the disintegrating of the fiber-containing mixture of substances, a moveable processing body is arranged opposite relative to at least one discharge element whereby on the passage of the fiber-containing mixture of substances through the discharge element a slit-like processing area is formed between the discharge element and the substance mixture-affected partial surface of the moveable processing body.

A method of and an arrangement for adding a chemical to an approach flow system of a fiber web machine by mixing of a retention chemical to a fibrous stock flowing in an approach flow system of a fiber web machine by a mixer (200) between the attenuator (16) and the headbox (18).

The invention relates to a method for treating biomass (1). In a step (S10) of the method, the biomass (1) and an amount of water (2) is fed into a first reactor unit (10) such that the biomass (1) is impregnated using the amount of water (2) while the biomass (1) is transferred through the first reactor unit (10) by a conveyor means (11). In another step (S20), the impregnated biomass (22) is transferred from the first reactor unit (10) to a separation unit (20) in which at least a part (21) of the amount of water (2) used for impregnation can be separated from the impregnated biomass (22). In another step (S30), the impregnated biomass (22) is transferred from the separation unit (20) into a second reactor unit (30) in which the impregnated biomass (22) is subjected to a predetermined pressure (S30). The invention further relates to the use of the method for treating non-wood material as well as to a device for treating biomass (1).

An accept tank arrangement for mixing of pulped fiber suspension including sidewalls (3,4) including opposite arched ends (2) and an elongated section (1) between the arched ends (2). The accept tank has mixers (10) each located within one of the arched ends (2). The mixers (10) have axles (11) on which are mounted propellers (12). The mixers (10) are aligned horizontally and each axle points to a respective point on the elongated section (1) of the sidewall (3) which away from an end of the elongate section by at least 25% of the length of the elongated section (1). The propellers (12) are symmetrically positioned with respect to a center-point of the accept tank. Within the center of the elongated section is an elongated centerpiece (6) having rounded ends. The accept tank has a substantially flat bottom at least at the elongated section (1) of the accept tank.

Cellulose nanofilaments from cellulose fibers, a method and a device to produce them are disclosed. The nanofilaments are fine filaments with widths in the sub-micron range and lengths up to a couple of millimeters. These nanofilaments are made from natural fibers from wood and other plants. The surface of the nanofilaments can be modified to carry anionic, cationic, polar, hydrophobic or other functional groups. Addition of these nanofilaments to papermaking furnishes substantially improves the wet-web strength and dry sheet strength much better than existing natural and synthetic polymers. The cellulose nanofilaments produced by the present invention are excellent additives for reinforcement of paper and paperboard products and composite materials, and can be used to produce superabsorbent materials.

A stirring device has a storage tank and a stirring member that stirs an inside of the storage tank, and the stirring member has a humidified air release port through which humidified air, which is air humidified, is released into the storage tank.

A sheet production apparatus includes a tank configured to store paper pieces, a motor, a blade provided in the tank and rotated by a force of the motor, a tube configured to take in the paper pieces transported outward by the rotation of the blade, a transport path configured to transport the paper pieces from the tube, a production mechanism configured to defibrate the transported paper pieces and produce a sheet, a measuring instrument configured to measure an amount of paper pieces from the tube, and a processor configured to correct a next operation of the tube based on the amount of paper pieces and correct an operation of the motor based on a moving average value of the amount of paper pieces.