Method for producing pressed products from fiber-containing raw materials

Abstract

A method produces pressed products from fiber-containing raw materials such as wood, straw, peat or suchlike, which are also referred to as secondary raw materials. In order to produce well pressed products, fiber-containing raw materials are mixed with water, vapor and, if need be, further additives while heating the raw materials and additives, the mixture being held at high temperature for a lengthy period of time before pressing.

1 . A method for producing pressed products from fiber-containing raw materials such as wood, straw, peat or the like in a pressing or expander plant, the method comprising: mixing fiber-containing raw materials with water, vapor and, if need be, further additives while heating the raw materials and additives, wherein the mixture is held at high pressure for a dwell period before pressing. 
   
   
       2 . The method according to  claim 1 , wherein the mixture is held in an intermediate container during the dwell period. 
   
   
       3 . The method according to  claim 1 , wherein the conditioning temperature comprises temperatures up to 200° C. 
   
   
       4 . The method according to  claim 1 , wherein the mixture is preferably held at a temperature up to 150° C. 
   
   
       5 . The method according to  claim 1 , wherein fat and/or lignin are additionally added to the raw materials. 
   
   
       6 . The method according to  claim 1 , wherein the conditioning takes place pressure-less or in the presence of excess pressure. 
   
   
       7 . A device for producing pressed products from fiber-containing raw materials such as wood, straw, peat or the like, the device comprising: a pressing or expander plant performing a method according to  claim 1 , wherein an intermediate container is disposed downstream of a dwell-time unit following a mixer. 
   
   
       8 . The device according to  claim 7 , wherein the intermediate container is disposed upstream of a pellet mill or an expander. 
   
   
       9 . The device according to  claim 7 , further comprising a double screw disposed downstream of the intermediate container, wherein screw flights of the double screw are mechanically coupled offset by 180° with respect to one another. 
   
   
       10 . The device according to  claim 7 , wherein at least the intermediate container is thermally insulated.