At ATTSUKLAUS we manufacture autoclaves for vulcanization by means of the following techniques:
1. Direct steam technique
The autoclave is loaded with tires appropriated for this process. The tires are placed inside the autoclave, then it is hermetically sealed and steam is introduced under pressure, for a period of time tires are subjected to pressure and temperature.
2.Indirect steam with third pressure technique
A rubber cover called 'envelope' is placed which covers the tire completely, the envelope is composed by a valve through which releases the third pressure.
The tires are introduced into the autoclave chamber, the hoses are connected for the introduction of pressure and afterwards, the autoclave is hermetically closed.
The steam coming from the boiler is not directly introduced into the chamber, but through a heat exchanger. The steam heats the air introduced into the chamber. As the temperature increases to 125 ° C, the chambers inside the tires are inflated and pressure is introduced into the autoclave, there is a difference of 30 psi (2.1 bar), until the chamber reaches a 80psi pressure (5.5 bar) and tires are at 115 psi (8 bar)
Then, pressure is introduced to the tire covering the tire up to 60psi (4.2 bar), this pressure is known as third pressure. After introducing this pressure inside the process a better bond and finished is guaranteed. This process ends in a period of 150 minutes.
At the end of this period of time pressures are released in the following order: third pressure, pneumatic pressure and finally chamber pressure.