Provided is a paper roll production apparatus that saves installation space and enables production of paper rolls of different qualities and a shortening of production time. The paper roll production apparatus includes: a sheet-forming and dewatering part 5 forming paper stock into a sheet and for dewatering the paper stock; a drying machine 6 drying the paper stock dewatered by the sheet-forming and dewatering part 5 to form a dry paper material; a switching mechanism part switching to feed, into the drying machine 6, the paper stock dewatered by a first sheet-forming machine included in the sheet-forming and dewatering part 5 or the paper stock dewatered by a second sheet-forming machine included in the sheet-forming and dewatering part 5; and a winder 8 winding up the dry paper material provided by the drying machine 6 to form a paper roll. The first sheet-forming machine operates at a sheet-forming speed at which a fiber orientation of the paper stock is maintained. The second sheet-forming machine operates at a sheet-forming speed faster than the sheet-forming speed of the first sheet-forming machine. The winder 8 winds up the dry paper material at a speed corresponding to the sheet-forming speed of the first sheet-forming machine or to the sheet-forming speed of the second sheet-forming machine to form the paper roll material.

Provided is a paper roll production apparatus that saves installation space and enables production of paper rolls of different qualities and a shortening of production time. The paper roll production apparatus includes: a sheet-forming and dewatering part 5 forming paper stock into a sheet and for dewatering the paper stock; a drying machine 6 drying the paper stock dewatered by the sheet-forming and dewatering part 5 to form a dry paper material; a switching mechanism part switching to feed, into the drying machine 6, the paper stock dewatered by a first sheet-forming machine included in the sheet-forming and dewatering part 5 or the paper stock dewatered by a second sheet-forming machine included in the sheet-forming and dewatering part 5; and a winder 8 winding up the dry paper material provided by the drying machine 6 to form a paper roll. The first sheet-forming machine operates at a sheet-forming speed at which a fiber orientation of the paper stock is maintained. The second sheet-forming machine operates at a sheet-forming speed faster than the sheet-forming speed of the first sheet-forming machine. The winder 8 winds up the dry paper material at a speed corresponding to the sheet-forming speed of the first sheet-forming machine or to the sheet-forming speed of the second sheet-forming machine to form the paper roll material.

A method of making a fibrous sheet. The method includes forming a nascent web from an aqueous solution of papermaking fibers, moving a dewatered web on a transfer surface, and applying a vacuum at a molding zone defined between the transfer surface and a molding roll. The molding roll includes a permeable patterned surface on an exterior of the molding roll. The method also includes transferring the dewatered web from the transfer surface to the permeable patterned surface at the molding zone. The vacuum is applied during the transferring of the dewatered web, and the papermaking fibers of the dewatered web are (i) redistributed on the permeable patterned surface and (ii) drawn into a plurality of recess of the permeable patterned surface, in order to form a molded paper web. The method further includes drying the molded paper web in a drying section to form a fibrous sheet.

A dust collecting device includes a cylindrical filter, a backwash auxiliary member that is disposed at an end portion of the filter and of which at least a part is disposed in a cylinder of the filter, and an air current generation unit that generates a backwash air current that passes through the backwash auxiliary member and flows into the cylinder of the filter, in which the backwash auxiliary member includes a rectification unit that extends spirally in an axial direction of a center axis of the filter.

A dust collecting device includes a cylindrical filter, a backwash auxiliary member that is disposed at an end portion of the filter and of which at least a part is disposed in a cylinder of the filter, and an air current generation unit that generates a backwash air current that passes through the backwash auxiliary member and flows into the cylinder of the filter, in which the backwash auxiliary member includes a rectification unit that extends spirally in an axial direction of a center axis of the filter.

According to an example aspect of the present invention, there is provided a cost-effective method of producing cellulose based films by introducing an intense water removal system to the process, and cellulose based films thereof having improved properties.

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 defibrating unit that defibrates a raw material including fibers in an atmosphere, an accumulating unit that discharges defibrated matter 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 on which the defibrated matter is accumulated, a sheet forming unit that forms a sheet from the second web, a cutting unit that cuts the sheet into a preset size, and a control unit that executes a stop control with a cut operation of the cutting unit as a trigger in a case where an instruction to stop an apparatus is provided are included. In the stop control, the control unit stops operation of the defibrating unit after stopping rotation of the drum unit and movement of the mesh belt.

A sheet manufacturing apparatus includes: a second web former that forms a web of defibrated substances obtained by defibrating a raw material containing fibers; and a sheet former that forms a sheet of the web formed by the second web former. The sheet former has a former roller unit and a cleaning unit that has an oil impregnated web for cleaning a roller surface of the former roller unit.

The sheet manufacturing apparatus includes: a rough crushing unit that roughly crushes a raw material containing fibers; and a defibration unit that defibrates the roughly crushed raw material in a gas atmosphere. In addition, the sheet manufacturing apparatus includes: first and second web formers that accumulate defibrated substances obtained through a defibrating process and form webs; and a sheet former that forms a sheet of the second web. In addition, the sheet manufacturing apparatus includes: a vaporization-type humidifying unit that humidifies a space in which the raw material is roughly crushed by the rough crushing unit; and a mist-type humidifying unit that humidifies the webs that are formed by the first and second web formers.