Provided are a shredder assuring greater freedom in designing a feedstock supplier that supplies sheets, and a sheet manufacturing apparatus. The shredder has a feedstock supplier having a supply opening through which a sheet is supplied; and a shredding device configured to shred the sheet supplied from the feedstock supplier. The shredding device includes a rotary cutter that rotates on a first axis, and a circulating cutter that moves in an endless path and cuts the sheet in conjunction with the rotary cutter. The circulating cutter includes a conveyor configured to convey the sheet from the feedstock supplier to the rotary cutter.

Provided are a shredder assuring greater freedom in designing a feedstock supplier that supplies sheets, and a sheet manufacturing apparatus. The shredder has a feedstock supplier having a supply opening through which a sheet is supplied; and a shredding device configured to shred the sheet supplied from the feedstock supplier. The shredding device includes a rotary cutter that rotates on a first axis, and a circulating cutter that moves in an endless path and cuts the sheet in conjunction with the rotary cutter. The circulating cutter includes a conveyor configured to convey the sheet from the feedstock supplier to the rotary cutter.

The thickness of accumulated fiber can be appropriately measured when accumulating and processing fiber. A measuring device includes a distributor 60 that disperses material containing fiber; a mesh belt 72 that accumulates material dispersed by the distributor 60; a roller unit 650 that compresses a second web W2 accumulated on the mesh belt 72; and a measurement device 400 that measures the thickness of the second web W2 after compression by the roller unit 650.

The thickness of accumulated fiber can be appropriately measured when accumulating and processing fiber. A measuring device includes a distributor 60 that disperses material containing fiber; a mesh belt 72 that accumulates material dispersed by the distributor 60; a roller unit 650 that compresses a second web W2 accumulated on the mesh belt 72; and a measurement device 400 that measures the thickness of the second web W2 after compression by the roller unit 650.

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.

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.

Pulp fiber containing little ash is effectively recovered from a used sanitary product containing the pulp fiber and a polymer absorbent. The method according to the present invention comprises: a step for treating the used sanitary product with an ozone-containing gas and thus decomposing and removing at least a portion of the polymer absorbent in the used sanitary product; and a step for stirring the used sanitary product, that has been treated with the ozone-containing gas, in water or an aqueous solution containing an antiseptic and thus decomposing the used sanitary product into constituents. If required, the method may further comprise a step for separating the pulp fiber from the decomposition product obtained by the decomposition step.

Pulp fiber containing little ash is effectively recovered from a used sanitary product containing the pulp fiber and a polymer absorbent. The method according to the present invention comprises: a step for treating the used sanitary product with an ozone-containing gas and thus decomposing and removing at least a portion of the polymer absorbent in the used sanitary product; and a step for stirring the used sanitary product, that has been treated with the ozone-containing gas, in water or an aqueous solution containing an antiseptic and thus decomposing the used sanitary product into constituents. If required, the method may further comprise a step for separating the pulp fiber from the decomposition product obtained by the decomposition step.

A defibrating device and sheet manufacturing apparatus attract and remove metal fragments when metal fragments are mixed with fibrous material. A defibrating device has a main unit with a defibration section configured to defibrate fibrous material, and a swirl section configured to produce a rotational current, and by the rotational current cause the fibrous material to rotate and flow into the defibration section. The main unit has a magnet unit that is disposed to the swirl section, and has a magnet that attracts by magnetic force metal fragments conveyed with the fibrous material to the swirl section.

A defibrating device and sheet manufacturing apparatus attract and remove metal fragments when metal fragments are mixed with fibrous material. A defibrating device has a main unit with a defibration section configured to defibrate fibrous material, and a swirl section configured to produce a rotational current, and by the rotational current cause the fibrous material to rotate and flow into the defibration section. The main unit has a magnet unit that is disposed to the swirl section, and has a magnet that attracts by magnetic force metal fragments conveyed with the fibrous material to the swirl section.