Method of manufacturing osb with acoustic dampening properties

Abstract

A manufacturing process for manufacturing wood products with acoustic dampening properties. A noise-dampening polymer is introduced in-line in the manufacturing process to achieve higher acoustic performance. The polymer can be a viscoelastic polymer which is added during blending of the lignocellulosic strands prior to mat formation, or sprayed or otherwise coated on the lignocellulosic strands during mat formation, prior to formation of any boards or panels.

What is claimed is: 
     
         1 . A method for producing a noise-dampening manufactured wood product, comprising the steps of:
 treating a set of core layer lignocellulosic material with one or more chemicals or additives;   treating, in a manufacturing production line, the set of core layer lignocellulosic material with a noise-reducing polymer, wherein the noise-reducing polymer does not form a homogenous layer;   forming a multi-layer mat of lignocellulosic material, said multi-layer mat comprising a core layer comprising the treated set of core layer lignocellulosic material;   applying heat and pressure to the multilayer mat to produce a noise-dampening manufactured wood product.   
     
     
         2 . The method of  claim 1 , wherein the noise-dampening manufactured wood product comprises one or more boards or panels. 
     
     
         3 . The method of  claim 1 , wherein the noise-dampening manufactured wood product comprises a oriented strand board panel. 
     
     
         4 . The method of  claim 1 , wherein the multi-layer mat comprises three layers. 
     
     
         5 . The method of  claim 4 , wherein the three layers are a top layer, a bottom layer, and the core layer therebetween. 
     
     
         6 . The method of  claim 5 , further comprising the steps of:
 treating a set of top layer lignocellulosic material with one or more chemicals or additives; and   treating a set of bottom layer lignocellulosic material with one or more chemicals or additives.   
     
     
         7 . The method of  claim 6 , wherein the step of forming a multi-layer mat of lignocellulosic material comprises the steps of:
 forming, in the production line, the bottom layer from the set of bottom layer lignocellulosic material;   forming, in the production line on the bottom layer, the core layer from the set of core layer lignocellulosic material; and   forming, in the production line on the core layer, the top layer from the set of top layer lignocellulosic material.   
     
     
         8 . The method of  claim 1 , wherein the step of treating the set of core layer lignocellulosic material with the noise-reducing polymer comprises blending the polymer with the core lignocellulosic material prior to formation of the core layer. 
     
     
         9 . The method of  claim 1 , wherein the step of treating the set of core layer lignocellulosic material with the noise-reducing polymer comprises spraying, flowing, curtain coating or otherwise coating the core layer with the polymer. 
     
     
         10 . The method of  claim 7 , further comprising the step of treating the set of bottom layer lignocellulosic material with the noise-reducing polymer. 
     
     
         11 . The method of  claim 7 , further comprising the step of treating the set of top layer lignocellulosic material with the noise-reducing polymer. 
     
     
         12 . The method of  claim 1 , wherein the noise-reducing polymer is integrated with the lignocellulosic material forming the core layer. 
     
     
         13 . The method of  claim 1 , wherein the lignocellulosic material comprises strands.