Negative angle pulp molded cup lid

Abstract

Disclosed is a negative angle pulp molded cup lid, wherein the cup lid is made of pulp and comprises a top portion ( 1 ) and a side portion ( 2 ) connected to an edge of the top portion ( 1 ). An inner wall of the side portion ( 2 ) has an inner conical surface ( 31 ), the inner conical surface ( 31 ) forms an angle of less than 90° with a lower surface of the top portion ( 1 ), and the inner diameter of the inner conical surface ( 31 ) gradually decreases from top to bottom, such that the sealing property and the structural strength can be improved.

1 . A negative angle pulp molded cup lid, wherein the cup lid is made of pulp and comprises a top portion ( 1 ) and a side portion ( 2 ) connected to an edge of the top portion ( 1 ), characterized in that an inner wall of the side portion ( 2 ) has an inner conical surface ( 31 ), the inner conical surface ( 31 ) forms an angle of less than 90° with a lower surface of the top portion ( 1 ), and the inner diameter of the inner conical surface ( 31 ) gradually decreases from top to bottom. 
     
     
         2 . The negative angle pulp molded cup lid according to  claim 1 , characterized in that the side portion ( 2 ) has an equal wall thickness. 
     
     
         3 . The negative angle pulp molded cup lid according to  claim 1 , characterized in that the side portion ( 2 ) has a wall thickness that gradually increases from top to bottom. 
     
     
         4 . The negative angle pulp molded cup lid according to  claim 1 , characterized in that an outer wall of the side portion ( 2 ) has an outer conical surface ( 32 ) symmetrical to the inner conical surface ( 31 ). 
     
     
         5 . The negative angle pulp molded cup lid according to  claim 1 , characterized in that an outer edge of the lower surface of the top portion ( 1 ) is provided with an annular sealing groove ( 11 ), which allows an opening of a cup to snap therein. 
     
     
         6 . The negative angle pulp molded cup lid according to  claim 1 , characterized in that an end of the side portion ( 2 ) away from the top portion ( 1 ) is provided with a rib ( 4 ) that is folded outward. 
     
     
         7 . The negative angle pulp molded cup lid according to  claim 6 , characterized in that the rib ( 4 ) is parallel to the top portion ( 1 ). 
     
     
         8 . The negative angle pulp molded cup lid according to  claim 6 , characterized in that the rib ( 4 ) is arranged obliquely downward and outward. 
     
     
         9 . The negative angle pulp molded cup lid according to  claim 1 , characterized in that an inner wall of a lower end of the inner conical surface ( 31 ) is provided with an inner convex annular portion ( 33 ). 
     
     
         10 . The negative angle pulp molded cup lid according to  claim 9 , characterized in that the side portion ( 2 ) and the inner convex annular portion ( 33 ) are integrally formed.