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 fibrous body accumulating device includes: a drum having an opening for releasing a material containing fibers and rotating around a central axis; and a first dispersion member disposed in the drum and at a position unevenly distributed vertically below the central axis, and dispersing the material in the drum. Preferably, the fibrous body accumulating device further includes a second dispersion member disposed in the drum and at a position unevenly distributed vertically above the central axis, and dispersing the material in the drum.

A method of and an arrangement for adding at least one additional stock component to an approach flow system (30) of a fiber web machine by mixing the at least one additional stock component to a fibrous stock such that the stock flow is equalized (50) and the at least one additional stock component is introduced to the stock flow by injection mixing (80).

A fibrous body accumulating device includes: a drum having an opening for releasing a material containing fibers and rotating around a central axis; and a first dispersion member disposed in the drum and at a position unevenly distributed vertically below the central axis, and dispersing the material in the drum. Preferably, the fibrous body accumulating device further includes a second dispersion member disposed in the drum and at a position unevenly distributed vertically above the central axis, and dispersing the material in the drum.

A fibrous body accumulating device includes: a drum having an opening for releasing a material containing fibers and rotating around a central axis; and a first dispersion member disposed in the drum, extending in a direction along the central axis, and dispersing the material in the drum, in which the first dispersion member has a first portion having the material with a high dispersion ability and a second portion having the material with a lower dispersion ability than the first portion, the first portion and the second portion being disposed at different positions in a direction along the central axis.

A method of and an arrangement for adding at least one additional stock component to an approach flow system (30) of a fiber web machine by mixing the at least one additional stock component to a fibrous stock such that the stock flow is equalized (50) and the at least one additional stock component is introduced to the stock flow by injection mixing (80).

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 paper manufacturing system includes a paper machine that has a headbox to contain a slurry of fluid mixed with cellulosic fibers. The headbox has an opening therein to direct the slurry outwardly from the headbox. A turbulence unit is positioned within the headbox to agitate the slurry when the slurry travels through the headbox and out of the opening. In this way the turbulence unit facilitates a random organization of the cellulosic fibers in the slurry when the slurry leaves the headbox. The turbulence unit includes a plurality of cylinders and each of the cylinders urges the slurry to swirl into a plurality of eddies when the slurry passes around each of the cylinders. Each of the cylinders is comprised of a carbon fiber material to inhibit adhesion between the cellulosic fibers and the cylinders.

A method of casting an MFC film on a substrate (52) comprises providing an MFC dispersion having a solids content of 2.5-25% by weight, and a viscosity above 4 Pas at a shear rate of 20 s.sup.?1; exposing the MFC dispersion to a first shearing step (9), providing a shear rate of above 10 s.sup.?1; introducing the MFC dispersion into a film forming device (4), laterally distributing (41) the MFC dispersion: exposing the distributed MFC dispersion to a second shearing step (42), providing a shear rate of above 100 s.sup.?1; decelerating (43) the distributed MFC dispersion: exposing the MFC dispersion to a third shearing step (44), providing a shear rate of above 100 s.sup.?1; and simultaneously with, or subsequent to, the third shearing step (44), depositing the MFC dispersion on the substrate to form a wet MFC film on the substrate.

A paper manufacturing system includes a paper machine that has a headbox to contain a slurry of fluid mixed with cellulosic fibers. The headbox has an opening therein to direct the slurry outwardly from the headbox. A turbulence unit is positioned within the headbox to agitate the slurry when the slurry travels through the headbox and out of the opening. In this way the turbulence unit facilitates a random organization of the cellulosic fibers in the slurry when the slurry leaves the headbox. The turbulence unit includes a plurality of cylinders and each of the cylinders urges the slurry to swirl into a plurality of eddies when the slurry passes around each of the cylinders. Each of the cylinders is comprised of a carbon fiber material to inhibit adhesion between the cellulosic fibers and the cylinders.