A used paper recycling apparatus includes a defibration unit that defibrates used paper to generate a defibrated product, an accumulation unit that accumulates the defibrated product to form a web, a sheet forming unit that forms a sheet by applying at least one of heating and compression to the web, a cutting unit that cuts the sheet into a predetermined length, and an optical sensor that is provided at an exit of the sheet forming unit and that measures density information of the sheet.

An accumulating unit that discharges fibers by rotating a drum unit in which a plurality of openings are formed, a second web forming unit that forms a second web by operating a mesh belt, a sheet forming unit that forms a sheet from the second web, and a control unit that performs a start control for operating the accumulating unit and the second web forming unit from the stop state are included. In a case where the start control is performed from a state where the fibers are present in the drum unit, the control unit adjusts a thickness of the second web by controlling at least one of a timing at which rotation of the drum unit is initiated, a rotational speed of the drum unit, a timing at which movement of the mesh belt is initiated, and a movement speed of the mesh belt.

A powder collection unit includes a powder storage having an inlet through which powder including fibers enters and an outlet through which the powder exits, a delivery screw having an elongated shape, disposed in the powder storage, and configured to rotate about a rotation axis to send out and discharge the powder through the outlet, and a powder collection portion coupled to the outlet and having an inner space that collects the powder discharged through the outlet. An end portion of the delivery screw that is adjacent to the outlet protrudes outwardly from the powder storage through the outlet and resides in the inner space of the powder collection portion.

A fiber structure manufacturing apparatus including: an accumulation portion that accumulates a material containing a resin and a fiber in air to generate a fiber web; a transport portion that transports the generated fiber web in a transport direction; and a heating and pressurizing portion that pressurizes the transported fiber web with a heated lower flat plate and an upper flat plate to melt the resin, in which a liquid absorbent having a first region where pressurization by the heating and pressurizing portion is performed the predetermined number of times and a second region where the pressurization is performed more than a predetermined number of times is formed by alternately repeating transport at a predetermined pitch shorter than a length of the flat plate in the transport direction by the transport portion and the pressurization.

A sheet manufacturing apparatus includes: a defibration unit that defibrates a raw material containing fibers in a gas atmosphere; and a sheet former that forms a sheet by using at least a part of defibrated substances obtained through a defibrating process performed by the defibration unit. The defibration unit and the sheet former are thermally blocked from each other.

A tissue machine (1) has a Yankee (3) and a shoe roll (4) that forms a nip with the Yankee (3). The nip has a maximum extension from an entry point (7) to an exit point (8). A flexible belt (9) forms an outer circumference of the roll (4). A fabric (10) carries a fibrous web (W) to the nip and passes through the nip with the web. The fabric (10) reaches the circumference of the roll (4) at a first contact point (11) and wraps the roll (4) from the first contact point to the nip. A mechanical support (12) inside the belt (9) supports the belt (9) between the first contact point (11) and the nip. The fabric (10) wraps the roll (4) from the first contact point (11) by more than 80°. The invention also relates to a method of operating the machine.

A method of forming a fibrous web including the steps of providing a fiber slurry, depositing the fiber slurry between an inner forming wire and an outer forming wire, wherein the outer forming wire comprises a structured fabric and the inner forming wire contacts a segment of a forming roll, and rotating the forming roll so that the fiber slurry moves into contact with the structured fabric.

The vaporization type humidification unit includes a vaporization unit that evaporates moisture, a first blower that sucks humidification air humidified by the vaporization unit, a transport tube that is connected to the first blower and through which the air discharged from the first blower is transported, a second blower connected to the transport tube and discharging the humidification air discharged from the first blower side toward outside, an opening provided in a middle of the transport tube, a humidity measurement unit installed on a discharging side of the second blower, and a control unit that controls an air flow rate discharged from the first blower and the second blower, in which the control unit controls the air flow rate discharged from the second blower to a desired value and controls the air flow rate discharged from the first blower based on a humidity measured by the humidity measurement unit.

A method is disclosed for increasing strength properties, preferably burst strength and SCT strength, of a paper or board product. The paper or board product is manufactured from a fibrous web produced by a multilayer headbox, where an aqueous layer is formed between at least a first and a second fibre layer formed from fibrous stock suspension(s), and where feed water for the aqueous layer includes at least one cationic polymer. The method of the invention includes adding an anionic additive selected from a group comprising anionic synthetic organic polymers, anionic polysaccharides, and any of their combinations to the feed water before formation of the aqueous layer.

A fibrous material accumulating apparatus includes a dispersing section which disperses a material containing fibers, a belt which accumulates the dispersed material, and a suction section provided on a side of the belt opposite to the dispersing section, in which the dispersing section includes a storage section including a screen, a supply section which supplies the material to the storage section, and a rotating body which is provided inside the storage section and agitates the material supplied into the storage section, and the storage section includes a communicating port which causes an inside and an outside of the storage section to communicate with each other and is provided at a different position from the screen.