A cellulose based pressboard for insulation in an electrical power transformer, the pressboard includes polyvinylamine (PVAm), and polyacrylamide (PAM), in a combined amount of between 0.01% and 20% by weight of the pressboard.

Method for producing a sound absorbing panel including the step of providing a predetermined amount of cellulose fibres. Cellulose fibres have an average length between 0.5 mm and 5 mm, preferably between 1.3 mm and 2.5 mm. The method further includes a step of soaking the cellulose fibres in a water basin to form a pulp and a step of depositing the pulp on a moulding die. The method further includes a step of pressing said the pulp in order to cause at least a partial removal of the water contained making a fibre mat. The method also includes a step of drying the fibre mat so as to cause evaporation of the water remained in the fibre mat making the sound absorbing panel.

Gas-permeable devices which absorb VOC and pollutants and/or are biocidal, containing molded parts or consisting of molded parts, containing materials or consisting of materials on the basis of wood, biodegradable fibers, biodegradable films and/or separated manure, containing geometrically regular and/or irregular, free and/or aggregated and/or agglomerated carbon nanoparticles, carbon microparticles and/or carbon macroparticles. Carbon is selected from the group consisting of biocarbons, biochar, charcoal, screening residues of charcoal, wood ash, activated carbons, hard coal, animal charcoal, carbons from animal waste, pyrogenic carbon having different degrees of pyrolysis, functionalized carbons, pretreated carbons, washed carbons, and extracted carbons.

Gas-permeable devices which absorb VOC and pollutants and/or are biocidal, containing molded parts or consisting of molded parts, containing materials or consisting of materials on the basis of wood, biodegradable fibers, biodegradable films and/or separated manure, containing geometrically regular and/or irregular, free and/or aggregated and/or agglomerated carbon nanoparticles, carbon microparticles and/or carbon macroparticles. Carbon is selected from the group consisting of biocarbons, biochar, charcoal, screening residues of charcoal, wood ash, activated carbons, hard coal, animal charcoal, carbons from animal waste, pyrogenic carbon having different degrees of pyrolysis, functionalized carbons, pretreated carbons, washed carbons, and extracted carbons.

Described herein is an acoustic building panel comprising a body comprising inorganic fiber in an amount ranging from about 60.0 wt. % to about 90.0 wt. % based on the total weight of the body; and microfibrillated fiber in an amount ranging from about 0.5 wt. % to about 10 wt. % based on the total weight of the body.

Described herein is an acoustic building panel comprising a body comprising inorganic fiber in an amount ranging from about 60.0 wt. % to about 90.0 wt. % based on the total weight of the body; and microfibrillated fiber in an amount ranging from about 0.5 wt. % to about 10 wt. % based on the total weight of the body.

The disclosure provides a method of forming an acoustical panel base mat, including providing a green board including an alkyl ether sulfate surfactant, wherein the green board includes from about 10 to about 40 wt. % solids, and dewatering the green board slurry to form a dewatered green board, wherein the dewatering comprises supplying hot air and applying a vacuum to the green board.

Wood-fiber insulation board is pressed to a uniform thickness and continuously advanced in a horizontal travel direction on a conveyor prior to subdivision into individual panels. The strength of the wood-fiber insulation board is determined by first pressing with an actuator a contact element downward at an actual pressure on a subregion of the advancing wood-fiber insulation board so as produce an actual deformation of the wood-fiber insulation board of between 1% to 7% of its thickness. Then a force sensor determines the actual pressure applied by the contact element to the board that produces the actual deformation and this the determined pressure and the actual deformation are transmitted to a central processor that extrapolates to a standardized deformation based on the determined pressure and actual deformation.

Wood-fiber insulation board is pressed to a uniform thickness and continuously advanced in a horizontal travel direction on a conveyor prior to subdivision into individual panels. The strength of the wood-fiber insulation board is determined by first pressing with an actuator a contact element downward at an actual pressure on a subregion of the advancing wood-fiber insulation board so as produce an actual deformation of the wood-fiber insulation board of between 1% to 7% of its thickness. Then a force sensor determines the actual pressure applied by the contact element to the board that produces the actual deformation and this the determined pressure and the actual deformation are transmitted to a central processor that extrapolates to a standardized deformation based on the determined pressure and actual deformation.

The disclosure provides a method of forming an acoustical panel base mat, including providing a green board including an alkyl ether sulfate surfactant, wherein the green board includes from about 10 to about 40 wt. % solids, and dewatering the green board slurry to form a dewatered green board, wherein the dewatering comprises supplying hot air and applying a vacuum to the green board.