IDROSTATICO - hydrostatic sterilizer

The plant consist of a complete system for the thermal process of tin plate cans, whit the following sections:


The loading section consists of a modular conveyor belt, an electronic count system of cans waiting to be loaded, an air can stop and a system for loading the cans from the conveyor to the carriers of the sterilizer.

The cans arrive on the conveyor belt in horizontal position (the body of the can laying horizontally), a sensor checks that there are enough cans to fill the carrier, and it shuts the can stop. 

A twin rotary loading system shifts the cans from the conveyor to the carrier. An electromechanical control system verifies that the cans are loaded correctly on to the carrier.

The machine can be programmed to decide exactly how many cans are wanted on each carrier.

Independently from the number loaded, the cans will always automatically be situated in the middle of the carrier.

Carriers are programmed for cans which have the same diameter but different lengths.

An electromechanical control system verifies that the cans are loaded correctly on to the carrier.

If a can is loaded wrong-sided then an acoustic alarm goes off and the machine stops. The electrical board will show a detailed explanation for each type of alarm  or problem.


The sterilizing section, where the product is heated, consists of a closed box-shaped chamber with a single inlet at the bottom and a hollow rectangular column flanged on that inlet. A system of shafts, sprockets and rails convey two chains on which metal bars (carriers) are fixed crosswise to carry the cans inside the chamber. The bottom of the chamber and the column inlet are kept full of water, the hydrostatic pressure exerted by the water column is counterbalanced by the pressure inside the chamber. In this way we obtain an environment where the pressure is greater than the atmospheric pressure, and so we can achieve pasteurization temperature of about 110 ° C.

A system of pumps draws water from the bottom of the chamber, sends it to a pipe in pipe heat exchanger (steam / water) which regulates the temperature and evenly distributes the water through a system of manifolds and nozzles.

The nozzles have small holes, and a filter is situated between the pump and the nozzles to avoid the holes getting obstructed by small parts of solid material.

The pasteurization water is not affected by any pollution caused by moisture carryover, it can be continuously filtered and defatted and / or specific products can be added to avoid sediments on treated cans. A level control integrates the water lost by evaporation and moisture carryover. The indirect heat exchange system also allows us to fully recover the condensation of steam obtaining energy conservation.

The whole process is also a lot quicker so that the product is exposed to the heat for a shorter time.


The cooling section, where the cooling of the product takes place, consists of a chamber similar to the hot one, where a pump draws the water from the bottom and sends it to a series of nozzles that evenly distribute it on the product. A temperature control integrates the cooling flow with cool water at 18 ° C for constant cooling temperature. In case of shortage of well water, you can equip the plant with a chiller unit or resize the cold section to work with the cooling tower water at about 32 ° C. The excess water is discharged by an overflow pipe. As with the hot section, the water in circulation can be treated with additives if needed.


The downloading section consists of a modular conveyor belt that gets the cans from the carriers and delivers them in a horizontal position (the body of the can laying horizontally).


The electrical control panel consists of a stainless steel modular cabinet, a set of inverter drives for all motors present and an automated data base management through a graphic interface with PLC and colour touch screen 15". The supervision system stores all data and records all operations on the memory card.






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