Hardening and Packaging


4 – Hardening and Packaging

Curing in the autoclave

Steam Autoclave:
a): 1 autoclave one time loading capacity: 3 m3 x 14 cakes = 42 m3
b): 1 autoclave steam time will be within 12 hour (usually 10 – 11hours).
It can cycle two times per day, one autoclave one day production: 42 m3 x 2 times = 84 m3
c): 6 pieces autoclave 1 day production, 84 x 6 = 504 m3 >500 m3


A standard autoclave is designed for a pressure of 12 bar and 190 °C. With 31,5 m in length and 2 m in diameter, it carries 6 hardening cars with three pallets of the autoclave each car, in whole there are 18 cakes which find their places in the autoclave.
Steam generator:
6 Ton/hour, with 16 bar pressure. Each m3 block will use 150 kg steam (water),
so 500 m3 x 150 kg = 75 Ton boiler steam.
So average, 6 Ton/hour boiler x 12.5 hours = 75 ton boiler steam, full capacity 


Heat recovery:

The curing of the material in the autoclave is the primary stage of the process consuming the steam. Usually several autoclaves are operated at different times, and a steam accumulator used for the partial recovery of heat.

Heat recovery is to use the condensate and also to the optimum reuse of the steam that is produced for autoclaving.
Upon closing of the autoclave, the steam will be temporarily stored on the one hand for use in autoclaving and secondly to the building heating system and the preheating of the feed water.
Through a heat exchanger, heat can be regained condensate for use in the feed water preheating or to preheat the fermentation chambers or to heat buildings.



After curing in the autoclave cured cake out of the autoclave with a transport portal system will be transported to the separator for separating stones of the cake from each other.

Then the stones will be placed on a pallet, after pallet will be transported to the packaging line to be rimmed with plastic wrap
With this efficient packaging, the blocks are dry, clean and stable on the pallet.
The pallet goes through the marking system and at the end the pallet will be transported to storage.