CANNED FISHERY PRODUCTS 



319 



so that the can may be withdrawn from the chuck. A knockout rod and pad 

 to control the cover prior to its contact with the chuck and finally a turret 

 or timing device to control the can as it passes through the closing ma- 

 chine. The sequence of operations involved in seaming a can end onto a 

 can body are shown in Figure 24.3. 



1ST OPERATION 

 SEAMING ROLL 



SEAMING CHUCK 



BEFORE SEAMING 



Double seaming is performed in two 

 operations. The first operation 

 roll curls the end hook around the 

 inside of the body hook to provide 

 an interlock. 1 



1ST OPERATION 

 SEAMING ROLL 



SEAMING CHUCK 



L 



AFTER SIART OF 

 1ST OPERATION SEAM 



1ST OPERATION 

 SEAMING ROLL 



SEAMING CHUCK 



\ 



/ 



^P^ 



FINISHED 1ST OPERATION 



The 2nd operation roll tightens 

 the seam and flattens the metal. 



2ND OPERATION 

 SEAMING ROLL 



SEAMING CHUCK 



FINISHED DOUBLE SEAM 



Figure 24.3. Sequence of operations for seaming a can end on to a 

 can body. {Continental Can Co., Inc.) 



In addition, a cover feed mechanism is built into the closing machine 

 to feed, transfer, and index the cover with the can body at the point of 

 assembly. 



Methods of Obtaining a Vacuum. Besides obtaining a hermetic seal, 

 it is also highly desirable to obtain a vacuum in canned foods to mini- 



