Sheet material and its production method

Abstract

PROBLEM To effectively utilize plant residue such as soybean hulls, rapeseed meal, rice bran, rice husk, and cacao husk. SOLUTION When forming sheet material from a mixture of burned plant material and fibrous material by a wet-process sheet production method, the burned plant material is one of a burned material of rice husk, a burned material of rice bran, a burned material of soybean hulls, a burned material of inner skin of peanut, a burned material of conduit side wall portion of seed plant or a burned material of cacao husk, and the fibrous material is one of a organic fiber derived from thermoplastic resin including polyolefin consisting of polyethylene and polypropylene, polyester, polyamide, vinyl chloride, polyacrylonitrile, polyvinyl chloride and aramid, a fiber derived from thermosetting resin including kynol, a natural fiber including cotton, wool, etc., a semisynthetic fiber, an inorganic fiber including glass fiber and carbon fiber, a metal fiber including iron, copper, stainless steel and steel, a metalized fiber with electroless plating applied on short fibers including synthetic resin and inorganic material, furthermore, a combination of these short fibers.

1 . A sheet material formed by a wet-process sheet production method from a mixture of burned plant material and fibrous material. 
     
     
         2 . The sheet material as claimed in  claim 1 , wherein the burned plant material is a burned material of rice husk, a burned material of rice bran, a burned material of soybean hulls, a burned material of rapeseed meal, a burned material of inner skin of peanut, a burned material of conduit side wall portion of seed plant, or a burned material of cacao husk. 
     
     
         3 . The sheet material as claimed in  claim 1 , wherein the burned plant material contains a spiral portion. 
     
     
         4 . The sheet material as claimed in  claim 1 , wherein the fibrous material is a thermoplastic resin fiber, a thermosetting resin fiber, a natural fiber, a semisynthetic fiber, a glass fiber, an inorganic fiber, a metal fiber, or one of these combinations. 
     
     
         5 . The sheet material as claimed in  claim 1 , in addition, wherein a metal filler is mixed. 
     
     
         6 . The sheet material as claimed in  claim 1 , wherein a mixing ratio of the fibrous material and the metal filler is 1:3 to 3:1. 
     
     
         7 . The sheet material as claimed in  claim 1 , wherein, after the wet-process sheet production, the sheet material is pressurized under a condition that a bulk density becomes 0.5 [g/cm 3 ] or above. 
     
     
         8 . The sheet material as claimed in  claim 1 , wherein, in addition, a matrix consisting of a thermosetting resin, or, a thermoplastic resin is mixed. 
     
     
         9 . A burned plant material included in the sheet material as claimed in  claim 1 . 
     
     
         10 . A method producing for a sheet material, wherein the method is to form a sheet by wet-process sheet production using a sheet making slurry obtained by mixing a fibrous material and a burned plant material in water. 
     
     
         11 . An electromagnetic shielding member, wherein the electromagnetic shielding member consists of a sheet material using a burned plant material. 
     
     
         12 . An electromagnetic shielding member consisting of a sheet material formed by a wet-process sheet production method from a mixture of burned plant material, fibrous material and metal filler. 
     
     
         13 . An electromagnetic shielding member laminated a sheet material using a burned plant material and a sheet material formed by a wet-process sheet production method from a mixture of burned plant material, fibrous material and metal filler.