Method of manufacturing natural cork film

A method of manufacturing a natural cork film, comprising:

• forming a cork layer by slicing a prepared natural cork material;
• forming a fiber layer by attaching a fiber sheet to one surface of the cork layer;
• pre-treating a lamination of the cork layer and the fiber layer for preventing discoloration of the cork layer;
• and
• forming a resin layer by attaching a resin sheet to the fiber layer during the pre-treating a lamination of the cork layer and the fiber layer step;
• wherein the pre-treating a lamination of the cork layer and the fiber layer step comprises decolorizing the cork layer of the lamination with a decolorant,
• wherein the decolorizing is performed by impregnating the lamination with decolorant and agitating, and
• wherein the decolorant is a hydrogen peroxide dilute solution comprising 20 wt. % to 50 wt. % of hydrogen peroxide with respect to a total weight of the hydrogen peroxide dilute solution wherein the hydrogen peroxide solution further comprises ammonia, and wherein a weight ratio ammonia to hydrogen peroxide is 1:20 to 1:5.