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.

The present invention refers to a method and respective system for producing reconstituted vegetable strips, whose said process comprises of milling steps of the vegetable materials to achieve specific particle sizes between 10 to 200 MESH; mixture of cellulose fibers in an intensive mixer to 1 to 10 min; mixture of vegetable material to a binding compound added to the nanocellulose fibers; adding at least one humectant agent and water to the mixture; submitting the mixture to a shearing step through a pre-lamination system comprised of at least two linear and parallel lamination rollers; submitting a strip to a mixture in an intensive mixer for obtainment of an homogeneous mass; lamination of the mixture between at least two linear and parallel lamination rollers, obtaining a continuous strip with a specific thickness; drying the vegetable strip through its passage through a thermal chamber in a specific temperature, between 90° C. and 900° C., through a conveyor belt; and cutting and final processing of the dry strip to obtain the final product.

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.

Methods of manufacturing a sheet or a board comprising recycled cellulose-containing materials, a binder composition comprising microfibrillated cellulose and one or more inorganic particulate material, and optionally one or more additive, wherein the sheet or board has an increased modulus of elasticity and modulus of rupture compared to a board prepared in a comparable method without microfibrillated cellulose, and to board, panel and construction products manufactured therefrom.

A pulper for circulating a fibrous stock suspension. The pulper includes at least one screen, having a screen surface which is provided with screen openings, and over which a rotor passes. The rotor is formed by a rotor head, to which a plurality of rotor blades are attached on the outer circumference. The rotor circle of the screen, which is passed over by the rotor wings, includes a plurality of bar-shaped elevations. In the process, pulping is to be improved, while wear is to be minimized, in that the angle of intersection between the working edge of the rotor blades pointing in the direction of rotation and the shear edge of the elevations pointing counter to the direction of rotation does not decrease radially outwardly.

A method is disclosed for predicting the microbial status of a paper or board making process and/or quality of the dry board or paper obtained from the process for controlling microbial status of a paper or board making process or quality of the dry board or paper obtained from the process. Surface level and duration of time in at least one storage tower or pulper are monitored and correlated with respective predetermined values for the tower or pulper in order to predict the risk of microbial activity.

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).

A sheet manufacturing apparatus includes a case that accommodates raw material pieces including fibers, a rotator that rotates inside the case to stir the raw material pieces, a stirring motor that rotates the rotator, a transport apparatus that transports the raw material pieces through a transport path coupled to a side wall of the case, and a control apparatus that controls rotation states of the rotator and the transport apparatus, in which the transport apparatus includes a discharge pipe that rotates on a central axis along the transport path, and a transport motor that rotates the discharge pipe.

A stirring apparatus includes a case that houses fiber pieces containing fibers, and a rotary body that is disposed inside the case and that stirs the fiber pieces, in which the rotary body includes a rotary portion that forms a portion of a bottom surface of the case and that rotates, and blades that stand upright on the rotary portion.