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K. S. Kulkarni and R. Adivarekar
Fig. 17 Semi continuous pre-treatment range
In commercial batch process, fabric in open width is treated with desizing recipe
in a suitable machine such as jigger. Usually, the recipe consists of desizing agent,
preferably amylase enzyme, salt and non ionic wetting agent (Fig. 17).
In semi-continuous process, use of pad-roll installation is used. The cloth, in open
width is pre-heated in a steam chamber after impregnation with desizing recipe, which
contains desizing agent, salt and non-ionic wetting agent. The padded goods after
steaming are batched in moveable carriages and are rotated for 8–12 h under steaming
atmosphere. The material is rotated gently to prevent uneven desizing due to drainage
and steam is injected into the chamber slowly to maintain required temperature.
In a continuous process, the padded fabric is steamed for 20–60 s at temperature
of 95–100 °C using saturated steam. The continuous process is described in detail
below.
2.5 Continuous Bleaching Range
The three Processes involved in Continuous Bleaching Range machine:
1. Desize Wash: (To wash the desized fabric so as to removed hydrolysed starch)
2. Scouring: (To remove the natural impurities present in fabric and to improve
absorbency)
3. Bleaching: (To bring uniform whiteness to the fabric) (Fig. 18).
Fig. 18 Continuous pre-treatment range (Goller)
K. S. Kulkarni and R. Adivarekar
Fig. 17 Semi continuous pre-treatment range
In commercial batch process, fabric in open width is treated with desizing recipe
in a suitable machine such as jigger. Usually, the recipe consists of desizing agent,
preferably amylase enzyme, salt and non ionic wetting agent (Fig. 17).
In semi-continuous process, use of pad-roll installation is used. The cloth, in open
width is pre-heated in a steam chamber after impregnation with desizing recipe, which
contains desizing agent, salt and non-ionic wetting agent. The padded goods after
steaming are batched in moveable carriages and are rotated for 8–12 h under steaming
atmosphere. The material is rotated gently to prevent uneven desizing due to drainage
and steam is injected into the chamber slowly to maintain required temperature.
In a continuous process, the padded fabric is steamed for 20–60 s at temperature
of 95–100 °C using saturated steam. The continuous process is described in detail
below.
2.5 Continuous Bleaching Range
The three Processes involved in Continuous Bleaching Range machine:
1. Desize Wash: (To wash the desized fabric so as to removed hydrolysed starch)
2. Scouring: (To remove the natural impurities present in fabric and to improve
absorbency)
3. Bleaching: (To bring uniform whiteness to the fabric) (Fig. 18).
Fig. 18 Continuous pre-treatment range (Goller)