Method of manufacturing a flame-retardant heat insulating formed product

Abstract

A method of manufacturing a flame-retardant heat insulating formed product in the shape of a mat includes pouring water in used paper or a pulp material to defibrate and obtain defibrated cotton. A flame retardant such as a boric acid is charged into the defibrated cotton. By stirring and heating, a flame-retardant heat insulating defibrated cotton is obtained. Short fibers with a low melting point made of polyester or the like are charged into the flame-retardant heat insulating defibrated cotton. By mixing and stirring, a flame-retardant heat insulating loose material is obtained. A forming die made of corrugated cardboard provided with a lid having air vents is filled with the flame-retardant heat insulating loose material. The flame-retardant heat insulating loose material together with the forming die are heated with a microwave heating apparatus to form. A mat-shaped formed product is removed from the forming die.

1 . A method of manufacturing a flame-retardant heat insulating formed product, including:
 pouring water in used paper or a pulp material to defibrate and obtain defibrated cotton;   charging a flame retardant into the defibrated cotton, and by stirring and heating, obtaining flame-retardant heat insulating defibrated cotton;   charging short fibers with a low melting point into the flame-retardant heat insulating defibrated cotton, and by mixing and stirring, obtaining a flame-retardant heat insulating loose material;   filling a forming die made of paper provided with a lid with the flame-retardant heat insulating loose material;   heating the flame-retardant heat insulating loose material together with the forming die with a microwave heating apparatus to form; and   removing a formed product from the forming die.   
     
     
         2 . The method of manufacturing a flame-retardant heat insulating formed product according to  claim 1 , wherein the forming die made of paper is a forming die made of corrugated cardboard. 
     
     
         3 . The method of manufacturing a flame-retardant heat insulating formed product according to  claim 1 , wherein the lid of the forming die has an air vent. 
     
     
         4 . The method of manufacturing a flame-retardant heat insulating formed product according to  claim 1 , wherein the flame retardant is a boric acid or boron. 
     
     
         5 . The method of manufacturing a flame-retardant heat insulating formed product according to  claim 1 , wherein the short fibers with a low melting point are made of polyester, polyethylene or polypropylene. 
     
     
         6 . The method of manufacturing a flame-retardant heat insulating formed product according to  claim 1 , wherein the flame-retardant heat insulating formed product is a mat-shaped formed product.