Developments in Textile Continuous Processing Machineries
387
Fig. 52 Schematic representation of air flow inside chamber
The exhaust fan draws the exhaust air with the evaporated water and any finishing agent vapours out of the heat treatment chamber and discharges them into the
atmosphere.
The exhausted mixture is replaced by fresh air. The exhaust air volume can be
regulated via mechanically adjustable air valves.
2.7.16 Heat Recovery Unit
A heat recovery system can be installed in order to save heating energy, thereby
saving on utilities.
The excess heat generated during process is directly exhausted through the exhaust
air ducts. In the heat recovery system, this excess heat which is simply wasted is used
to heat up the incoming process air using heat exchangers. Up to 60% of total volume
of the required air can be heated in this way. The savings are in the range of 10–30%,
depending on the production volume.
2.7.17 Selvedge Cutter and Suction Duct
Selvedge cutter assembly is primarily used when processing knitted fabric. The
knitted fabric has a tendency to curl at the selvedges. Hence, these are glued at the
selvedges using gluing device. When the process is completed, these glued portions
are removed by using a combination of optical and electronic control with pneumatic
support which ensure minimum selvedge cut-off. The latest technique involving laser
controlled pinning and top selvedge glueing, selvedge cut-off can be reduced by up
to 60% (Fig. 53).
387
Fig. 52 Schematic representation of air flow inside chamber
The exhaust fan draws the exhaust air with the evaporated water and any finishing agent vapours out of the heat treatment chamber and discharges them into the
atmosphere.
The exhausted mixture is replaced by fresh air. The exhaust air volume can be
regulated via mechanically adjustable air valves.
2.7.16 Heat Recovery Unit
A heat recovery system can be installed in order to save heating energy, thereby
saving on utilities.
The excess heat generated during process is directly exhausted through the exhaust
air ducts. In the heat recovery system, this excess heat which is simply wasted is used
to heat up the incoming process air using heat exchangers. Up to 60% of total volume
of the required air can be heated in this way. The savings are in the range of 10–30%,
depending on the production volume.
2.7.17 Selvedge Cutter and Suction Duct
Selvedge cutter assembly is primarily used when processing knitted fabric. The
knitted fabric has a tendency to curl at the selvedges. Hence, these are glued at the
selvedges using gluing device. When the process is completed, these glued portions
are removed by using a combination of optical and electronic control with pneumatic
support which ensure minimum selvedge cut-off. The latest technique involving laser
controlled pinning and top selvedge glueing, selvedge cut-off can be reduced by up
to 60% (Fig. 53).