Special screw rod for degradable film

The utility model discloses a special screw rod for a degradable film, and belongs to the technical field of degradation. The screw mainly comprises a screw body, a sealing cavity is formed in the screw body, a built-in sealing pipe is arranged in the sealing cavity, an electric heating block is fixedly installed on the inner wall of the right end of the built-in sealing pipe, deformation memory metal is fixedly installed on the left side of the electric heating block, and the other end of the deformation memory metal is fixedly connected with a sealing sliding plug. The sealing sliding plug is slidably connected into the built-in sealing pipe, and degradation liquid is arranged between the left side of the sealing sliding plug and the inner wall of the built-in sealing pipe. Degradation liquid is injected into the built-in sealing pipe of the screw, the deformation memory metal is heated to deform and extend, then the sealing sliding plug is pushed to move towards the left side, the degradation liquid in the