Provided are a paper strengthener coating device, a sheet manufacturing apparatus, a sheet, and a paper strengthener coating method capable of suppressing production of paper dust from sheets when printing on sheets of paper. The paper strengthener coating device has: a solution supply device configured to supply a solution containing a paper strengthener; an inkjet head having nozzles for ejecting the solution supplied from the solution supply device; and a paper strengthener coating unit configured to apply the solution ejected from the nozzles onto a sheet; the inkjet head preferentially or selectively applying the solution to an edge part of the sheet.

The present disclosure provides an improved process for making paper or paper board. The process comprises providing a cellulosic fibre suspension comprising recycled fibre material, and having a conductivity of at least 1.5 ms/cm; and adding a glyoxalated copolymer of acrylamide and cationic monomers and inorganic siliceous microparticles to the fibre suspension, sequentially or simultaneously. Advantages comprise improved productivity of the process, and paper strength.

The present disclosure provides an improved process for making paper or paper board. The process comprises providing a cellulosic fibre suspension comprising recycled fibre material, and having a conductivity of at least 1.5 ms/cm; and adding a glyoxalated copolymer of acrylamide and cationic monomers and inorganic siliceous microparticles to the fibre suspension, sequentially or simultaneously. Advantages comprise improved productivity of the process, and paper strength.

A system and method for producing cellulose insulation fiberizes the input cellulose material and removes cellulose dust before the resulting cellulose fibers and matrices of cellulose fibers are sprayed with a liquid fire-retardant chemical. A cellulose material metering bin supplies cellulose material to one or more fiberizers. A dryer operates to dry the liquid fire-retardant chemical to produce cellulose insulation.

A system and method for producing cellulose insulation fiberizes the input cellulose material and removes cellulose dust before the resulting cellulose fibers and matrices of cellulose fibers are sprayed with a liquid fire-retardant chemical. A cellulose material metering bin supplies cellulose material to one or more fiberizers. A dryer operates to dry the liquid fire-retardant chemical to produce cellulose insulation.

A method and a reactor to crystalize calcium carbonate and to form crystals in a liquid flow (F) with the concentration of 2.5% to 5% inside or on the surfaces of a fiber dispersion containing solid matter. The method includes feeding carbon dioxide (CO.sub.2) and lime milk (LM) (Ca(OH).sub.2) into the liquid flow and reacting the CO.sub.2 with the Ca(OH).sub.2 wherein the carbon dioxide (CO.sub.2) and/or lime milk (LM) is injected with a mixer crosswise into the liquid flow (F) and the injection is performed with a feed tube (2) to cause a dwell time of the crystallizing reaction of 0.5 to 10 seconds before a nozzle (20) of the reactor (1), after which the liquid flow (F) is mixed with the liquid or fiber suspension in container (4)