Method for producing a sound-absorbing panel

Abstract

Method for producing of a sound-absorbing panel, including a step of preparing a predetermined amount of cellulose fibres and a step of immersing the cellulose fibres in a first water basin to form a cellulose pulp. The method then includes a step of preparing a predetermined amount of textile fibres and a step of mixing, in water, the cellulose pulp with the textile fibres to obtain a final pulp and a step of depositing the final pulp on a forming mould. The method then includes a step of pressing at least the final pulp in order to cause an at least partial removal of the water contained in the final pulp making a fibre mat and a step of drying the fibre mat so as to cause evaporation of the water remained in the fibre mat making a sound-absorbing panel.

1 . A method for producing a sound-absorbing panel, the method comprising the steps of:
 preparing a predetermined amount of cellulose fibres;   immersing the cellulose fibres into a first water basin to form a cellulose pulp;   preparing a predetermined amount of textile fibres;   mixing, preferably in water, said cellulose pulp with said textile fibres to obtain a final pulp;   depositing said final pulp on a forming mould;   pressing at least said final pulp in order to cause at least partial removal of the water contained in the final pulp making a fibre mat;   drying said fibre mat so as to cause evaporation of the water remained in said fibre mat making a sound-absorbing panel.   
     
     
         2 . The method according to  claim 1 , wherein the method comprises, prior to the mixing step, a step of removing a predetermined amount of cellulose pulp from said cellulose pulp, and wherein in the deposition step, said final pulp is deposited on the mould to define a lower layer and said removed cellulose pulp is deposited on said lower layer to define an upper layer. 
     
     
         3 . The method according to  claim 2 , wherein during said pressing step a mixing sub-step occurs wherein, near an interface surface between the upper layer and the lower layer, part of the final pulp is at least partially amalgamated with part of said removed cellulose pulp defining an interface layer interposed between said lower and upper layer. 
     
     
         4 . The method according to  claim 1 , wherein the method comprises, prior to said step of preparing a predetermined amount of textile fibres, a step of shredding textile material, preferably said textile material being waste textile material, to obtain the textile fibres. 
     
     
         5 . The method according to  claim 1 , wherein said textile fibres are heterogeneous fibres, preferably said textile fibres comprising one or more among: cotton; wool; polyamides; polyester. 
     
     
         6 . The method according to  claim 1 , comprising a step of adding at least one dye in said first water basin so as to give a predetermined colouring to the cellulose pulp, preferably said at least one dye being a natural dye. 
     
     
         7 . The method according to  claim 1 , wherein prior to the mixing step, the method comprises a step of immersing the textile fibres into a second water basin to form a fibre pulp, and wherein in said mixing step, said cellulose pulp is mixed with said fibre pulp to obtain said final pulp. 
     
     
         8 . The method according to  claim 7 , comprising a step of adding at least one dye in said second water basin so as to give a predetermined colouring to the fibre pulp, preferably said at least one dye being a natural dye. 
     
     
         9 . The method according to  claim 7 , wherein said at least one dye is a powder dye, preferably the dye having a particle size between 20 μm and 80 μm. 
     
     
         10 . The method according to  claim 1 , wherein said cellulose fibres have a length between 0.5 mm and 5 mm. 
     
     
         11 . A sound-absorbing panel made according to the method claimed in  claim 1 , having a density value between 100 Kg/m 3  and 700 Kg/m 3 , preferably said density value being between 150 Kg/m 3  and 350 Kg/m 3 . 
     
     
         12 . Use of textile fibres to make a pulp to obtain a sound-absorbing panel according to  claim 11 .