Heat resistant food packing material and method of manufacturing the food packing material

Abstract

A first auxiliary agent containing anionic substances is prepared by mixing aluminum silicate and natural wax emulsion. Pulp containing natural fibers and water are fed to a pulper to mix uniformly with the first auxiliary agent to form a pulp premix. A second auxiliary agent containing non-ionic and cationic substances is prepared by mixing fluorochemical series resin, polymer compound, aliphatic polyamine and alkyl acryl copolymer. The pulp premix and second auxiliary agent are fed to a stock tank for mixing uniformly to form a pulp mixture which is fed to a paper molding machine for thermal forming and producing the packing material. Subsequently, the packing material is coated with releasing agent mixture and dried.

1 . A heat resistant food packing material, comprising: 
 pulp, which is composed of natural fibers;    water;    a first auxiliary agent, which contains anionic substances; and    a second auxiliary agent, which contains non-ionic and cationic substances;    wherein the first auxiliary agent, pulp and water are fed to a pulper for mixing uniformly to form a pulp premix, and the pulp premix and the second auxiliary agent are fed to a stock tank to mix uniformly to form a pulp mixture, and then the pulp mixture is conveyed to a paper molding machine for thermal forming, and subsequently to a releasing agent coating device for coating of releasing agent and to a drier for drying, forming the food packing material.    
     
     
         2 . The food packing material as claimed in  claim 1 , wherein the pulp is selected from the group consisting of  phragmites communis , sugar cane bagasse, straw pulp, wheat straw pulp, bamboo pulp and wood pulp.  
     
     
         3 . The food packing material as claimed in  claim 1 , wherein the first auxiliary agent is composed of aluminum silicate and natural wax emulsion.  
     
     
         4 . The food packing material as claimed in  claim 3 , wherein the aluminum silicate is an anionic hydrophobic substance, and for 100% by wt. (percentage by weight) of pulp, 50˜80% by wt. of aluminum silicate is used.  
     
     
         5 . The food packing material as claimed in  claim 3 , wherein the natural wax emulsion is a water repellent, and for 100% by wt. of pulp, 1.5˜9% by wt. of natural wax emulsion is used.  
     
     
         6 . The food packing material as claimed in  claim 1 , wherein the second auxiliary agent is composed of fluorochemical series resin, polymer compound, aliphatic polyamine and alkyl acryl copolymer.  
     
     
         7 . The food packing material as claimed in  claim 6 , wherein the fluorochemical series resin a non-ionic water repellent and oil repellent, and for 100% by wt. of pulp, 0.75˜5.4% by wt. of fluorochemical series resin is used.  
     
     
         8 . The food packing material as claimed in  claim 6 , wherein the polymer compound is a neutral sizing agent, and for 100% by wt. of pulp, 0.75˜5.4% by wt of polymer compound is used.  
     
     
         9 . The food packing material as claimed in  claim 6 , wherein the aliphatic polyamine is a cationic fixative, and for 100% by wt. of pulp, 0.15˜0.54% by wt of aliphatic polyamine is used.  
     
     
         10 . The food packing material as claimed in  claim 6 , wherein the alkyl acryl copolymer is a cationic water repellent, and for 100% by wt. of pulp, 0.75˜9% by wt of alkyl acryl copolymer is used.  
     
     
         11 . A method for producing a heat resistant food packing material, comprising steps of: 
 (a) separately preparing a pulp, a first auxiliary agent containing anionic substances and a second auxiliary agent containing non-ionic and cationic substances;    (b) mixing the pulp and the first auxiliary agent with water uniformly to form a pulp premix;    (c) mixing the second auxiliary agent with the pulp premix to form a pulp mixture; and    (d) thermal forming of the pulp mixture to form the packing material.    
     
     
         12 . A method as claimed in  claim 11 , wherein the packing material is further coated with a releasing agent mixture containing releasing agent after step (d).  
     
     
         13 . A method as claimed in  claim 12 , wherein the packing material is dried after coating.  
     
     
         14 . A method as claimed in  claim 11 , wherein the first auxiliary agent is composed of aluminum silicate and natural wax emulsion.  
     
     
         15 . A method as claimed in  claim 11 , wherein the second auxiliary agent is composed of fluorochemical series resin, polymer compound, aliphatic polyamine and alkyl acryl copolymer.