Developments in Textile Continuous Processing Machineries
367
Fig. 22 Line diagram of chemical metering station
2.5.3 Chemical Metering Station
A chemical metering station is used to dose the desired chemicals and auxiliaries
which are used for scouring and bleaching. In a usual pretreatment recipe, wetting
agent, sequestering agent, sodium hydroxide, hydrogen peroxide and hydrogen peroxide stabiliser are used. These chemicals are dosed according to the recipe set. It is
important to dose these chemicals precisely as per recipe and also every time consistently. Thus, reproducibility of dosing is extremely important for successful and
consistent results. Specially designed pumps are used for this purpose which ensure
uniform and reproducible results. Usually, following points are required for PLC to
dispense desired chemicals uniformly: weight of fabric, capacity of tank so as to
decide initial filling and dosage in ml/kg (Fig. 22).
2.5.4 Impregnation Chamber
An impregnation chamber is used to impregnate fabric with desired chemicals and
auxiliaries, followed by reaction chamber, neutralisation chamber and fabric delivery
section. Following are impregnation chambers manufactured by various machine
manufactureres.
Impacta
The technology is developed by M/s Benninger. Important feature of the machine is
a specially designed nip, which ensures uniform pick up. It is independent of speed
367
Fig. 22 Line diagram of chemical metering station
2.5.3 Chemical Metering Station
A chemical metering station is used to dose the desired chemicals and auxiliaries
which are used for scouring and bleaching. In a usual pretreatment recipe, wetting
agent, sequestering agent, sodium hydroxide, hydrogen peroxide and hydrogen peroxide stabiliser are used. These chemicals are dosed according to the recipe set. It is
important to dose these chemicals precisely as per recipe and also every time consistently. Thus, reproducibility of dosing is extremely important for successful and
consistent results. Specially designed pumps are used for this purpose which ensure
uniform and reproducible results. Usually, following points are required for PLC to
dispense desired chemicals uniformly: weight of fabric, capacity of tank so as to
decide initial filling and dosage in ml/kg (Fig. 22).
2.5.4 Impregnation Chamber
An impregnation chamber is used to impregnate fabric with desired chemicals and
auxiliaries, followed by reaction chamber, neutralisation chamber and fabric delivery
section. Following are impregnation chambers manufactured by various machine
manufactureres.
Impacta
The technology is developed by M/s Benninger. Important feature of the machine is
a specially designed nip, which ensures uniform pick up. It is independent of speed