Structural members fabricated from waste materials and method of making the same

Abstract

The structural member and fabrication thereof may be formed by mixing wood products chemically treated for durability and thermoplastics products. The fabrication process may included processing the products to a desired particle size; mixing the particles; processing the mixture in a high intensity processor and then processing the mixture in an extruder to obtain a molten state for forming the structural element in a mold. It is emphasized that this abstract is provided to comply with the rules requiring an abstract that will allow a search or other reader to quickly ascertain the subject matter of the technical disclosure. It is submitted with the understanding that it will not be used to interpret or limit the scope or meaning of the claims.

I claim:  
     
         1 . A method for manufacture of structural members from existing wood and thermoplastic products and materials, comprising the steps of: 
 selecting a wood product that has been chemically treated for durability;    processing said wood product in a grinder to form chemically treated wood particles;    selecting a thermoplastic and processing said thermoplastic in a chipper to form thermoplastic particles;    mixing said chemically treated wood particles and said thermoplastic particles in a mixer to form a mixture;    processing said mixture in a high intensity processor to further mix and preheat said mixture;    processing said mixture in an extruder to compress and heat said mixture to form a molten mixture;    placing said molten mixture into a mold for forming a structural member; and    removing from said mold after cooling has occurred said structural member.    
     
     
         2 . The method as in  claim 1  wherein said wood product chemical treatment is creosote oil.  
     
     
         3 . The method as in  claim 1  wherein said wood product is selected from the group of a wood railroad tie, a wood utility pole and a wood sign post.  
     
     
         4 . The method as in  claim 1  wherein said thermoplastic is selected from the group of a polyethylene and a polypropylene.  
     
     
         5 . The method as in  claim 1  wherein said chemically treated wood particles are processed to a size to be a diameter of approximately one to forty millimeters.  
     
     
         6 . The method as in  claim 1  wherein said thermoplastic particles are processed to a size to be a diameter of approximately one to twenty millimeters.  
     
     
         7 . The method as in  claim 1  wherein processing said thermoplastic is performed in a densifier.  
     
     
         8 . The method as in  claim 1  wherein said wood product is a waste material.  
     
     
         9 . The method as in  claim 1  wherein said thermoplastic is a waste material.  
     
     
         10 . The method as in  claim 1  wherein said mixture is comprised of approximately ten to seventy percent by weight of said thermoplastic and approximately thirty to ninety percent by weight of said wood product.  
     
     
         11 . The method as in  claim 1  wherein processing is said high intensity processor further reduces the size of said thermoplastic particles and said chemically treated wood particles.  
     
     
         12 . The method as in  claim 1  wherein said extruder heats said mixture to approximately a temperature of 150 degrees Centigrade to 230 degrees Centigrade.  
     
     
         13 . The method as in  claim 1  further comprising the step of adding a fire retardant substance during the mixing step.  
     
     
         14 . A structural member produced according to the method of  claim 1 .  
     
     
         15 . A method for manufacture of structural members from existing wood and thermoplastic products and materials, comprising the steps of: 
 selecting a wood product that has been chemically treated for durability;    processing said wood product in a grinder to form chemically treated wood particles of a diameter of approximately one to forty millimeters;    selecting a thermoplastic and processing said thermoplastic in a chipper to form thermoplastic particles of a diameter of approximately one to twenty millimeters;    mixing said chemically treated wood particles and said thermoplastic particles in a mixer to form a mixtures comprised of approximately ten to seventy percent by weight of said thermoplastic and approximately thirty to ninety percent by weight of said wood product;    processing said mixture in a high intensity processor to further mix and preheat said mixture;    processing said mixture in an extruder to compress and heat said mixture to approximately a temperature of 150 degrees Centigrade to 230 degrees Centigrade to form a molten mixture;    placing said molten mixture into a mold for forming a structural member; and    removing from said mold after cooling has occurred said structural member.    
     
     
         16 . A structural member produced according to the method of  claim 15 .  
     
     
         17 . A structural member comprising: 
 a mixture of a wood product chemically treated for durability and a thermoplastic;    wherein said mixture is comprised of ten to seventy percent by weight of said thermoplastic and thirty to ninety percent by weight of said wood product; and    wherein said mixture has been compressed and heated to allow said thermoplastic to penetrate in said wood product having molds therein.    
     
     
         18 . The structural member as in  claim 17  wherein said wood products are chemically treated with creosote oil.