386
K. S. Kulkarni and R. Adivarekar
Fig. 51 Gas fired system
2.7.12 Circulation Fan
The circulation fans can be located alongside or above the roof of the treatment
chambers. The air circulation fans ensure the necessary circulation of the treatment
air. The air circulation fans are driven by 3-phase AC motors and variable speed
inverter drives. All drive motors are of maintenance-free design.
2.7.13 Twin-Air
The technology is developed by M/s Monforts for stenter. The technology uses two
independent circulation fans which gives hot air to top and bottom nozzles from
radiator. The frequency of both fans can be adjusted independently. This allows
completely even temperature on the fabric surface (Fig. 52).
2.7.14 Nozzle System
The nozzles are important part of the stenter machine. The air is blown on the fabric
surface in such a way that maximum heat is transferred equally on both surfaces of
fabric. There is a different design for woven fabric and different for knitted fabric.
2.7.15 Exhaust Air Fan
Depending on the type and configuration of the machine, the chamber is connected
via a duct system to one or two exhaust fans.