Patent ID: 7449211

Claim:
A method of manufacturing a bio-sheet material, said method comprising the steps of: preparing a first material ( 1 ) by mixing together a material selected from the group consisting of: natural minerals, plants, ocher processed at a high temperature above 1,000 C, ocher, jade, tourmalin, white earth, mugwort, charcoal, elvan stone, silver, zeolite, aluminum, copper, and gold, and a bonding agent selected from the group consisting of: an extract from natural raw material and a binder of a synthetic polymer group: dipping a second material ( 2 ) in the first material ( 1 ) so as to permeate the first material into the second material ( 2 ) and to apply the first material ( 1 ) thinly to opposite surfaces of the second material ( 2 ), the second material ( 2 ) being one of non-woven cloth, cotton cloth or gauze; evenly distributing the first material ( 1 ) applied to, and permeated into, the second material ( 2 ) using a pair of thickness-control and mixture-leveling rollers ( 35 , 55 , 75 ) so as to make an overall thickness of the second material ( 2 ) with the first material ( 1 ) constant and uniform between about 0.2 mm and 3 mm, and so as to return the remaining first material ( 1 ), by vertically and upwardly passing the second material ( 2 ) with the first material ( 1 ) through a constant gap of the pair of thickness-control and mixture-leveling rollers ( 35 , 55 , 75 ) after the dipping step; drying the second material ( 2 ) with the first material ( 1 ) applied thereto and permeated thereinto in a first drying step at a temperature of 80˜180 degrees C. while vertically and upwardly transporting the second material ( 2 ) with the first material ( 1 ) in a first drying furnace ( 37 a , 57 a , 77 a ) on condition that the first material ( 1 ) does not flow by being subjected to no interference by external force and the overall thickness can be maintained constant during the first drying step, and to the extent that at least fluid and adhesion of the first material ( 1 ) does not occur so that, although the second material ( 2 ) with the first material ( 1 ) comes in contact with guide rollers ( 36 , 56 , 76 a ) and upper transportation and leveling rollers ( 38 a , 58 a ), the first material ( 1 ) can not be separated from the second material ( 2 ); transporting and leveling the second material ( 2 ) with the first material ( 1 ) by passing the second material ( 2 ) with the first material ( 1 ) through the upper transportation and leveling rollers ( 38 a , 58 a ) after the first drying step; and completely drying the second material ( 2 ) with the first material ( 1 ) in a second drying step by descending and raising it approximately in a V or U letter shape under hot wind circulation at a temperature of 50˜120 degrees C. in a second drying furnace ( 37 b , 57 b , 77 b ) after the transporting and leveling step.