Can lid and manufacturing method therefor

Abstract

By conducting a strict study on a plate thickness, a pressure resistance is improved while satisfying the demand for further reduction of the plate thickness.A can lid has a center panel part, a panel wall part, a chuck wall radius part, a chuck wall part, and a curl part. t2>t1 holds, where t1 represents a plate thickness of the center panel part, and t2 represents a plate thickness of a bottom end of the panel wall part.

1 . A can lid having a center panel part, a panel wall part, a chuck wall radius part, a chuck wall part, and a curl part,
 wherein t 2 >t 1  holds,   where t 1  represents a plate thickness of the center panel part, and t 2  represents a plate thickness of a bottom end of the panel wall part.   
     
     
         2 . The can lid according to  claim 1 ,
 wherein t 2 >1.01*t 1  holds,   where t 1  represents a plate thickness of the center panel part, and t 2  represents a plate thickness of a bottom end of the panel wall part.   
     
     
         3 . The can lid according to  claim 1 ,
 wherein t 3 >1.01*t 1  holds,   where t 3  represents a plate thickness of the chuck wall radius part.   
     
     
         4 . The can lid according to  claim 1 ,
 wherein t 1 >t 4  holds,   where t 4  represents a plate thickness of a middle part of the chuck wall part.   
     
     
         5 . Canned goods using the can lid according to  claim 1 . 
     
     
         6 . A manufacturing method for the can lid according to  claim 1 ,
 wherein the chuck wall radius part is shaped by relatively pressing down a processed part to be processed into the center panel part.   
     
     
         7 . The manufacturing method for the can lid according to  claim 6 ,
 wherein ironing is added to a part of the chuck wall part.