Canning and Fish Packaging Technology

Unit 3 - Unit operations in canning

3.2.5.5.1.1.Hydrostatic sterilizer
In this pressure of water Colum is used. There are 3 inter connected towers of about 40’ high as shown in the figure. The conveyor belt carrying the can enters from the top of one of the towers and comes down and enters the middle tower where there is steam under pressure. The difference in levels of water between the side and middle tower determines the steam pressure or temperature. After the cans receive the required heat process it enters the third tower where it gets partially cooled, then it gets cooled by air spray of water and finally in running cold water.

The important advantage of this sterilizer is that there is no sudden variation in pressure while the can enter and exit from it. The defects such as panelling or denting or loose seam formation are not there.