Roll core used for winding membrane

The utility model relates to a roll core (100) used for winding a membrane, specifically to a roll core (100) used for winding an optical laminated membrane. The roll core is characterized by comprising a cylindrical hollow resin core tube (1), two metal sleeves (2) fixed to two axial ends of the resin core tube through a fixing device, and an elastic layer (3) covering the outer surface of the resin core tube. The roll core is used for winding membrane in the manufacturing process of polarizing film and other optical membranes. The roll core can bear added weight due to broad width of the optical membrane. Furthermore, the body of the roll core is made of resin. The whole weight of the roll core is reduced, operation is improved. Besides, the outer surface of the resin core tube is covered by the elastic layer, so that the optical membrane near the roll core part is effectively prevented from generating reel marks.