A further crabbing machine is shown in figure C.
The incoming fabric is impregnated in a bisulphite-based bath, in addition to the most appropriate wetting agent;
it then passes over a large heated drum (see figure C, point 2) against which it comes
pressed by a rubber mat (fig. C, 1) which crushes the fabric and hinders the escape of the
steam, which in this process reaches temperatures above 100 ° C.
At the end, the fabric passes through a cooling tank (fig. C, 3).
Attention: the outgoing fabric must always be wound on a roll to avoid indelible stripes
from pitch.
The speed of the machine is adjusted according to the weight of the fabric.
The cooling of the cylinder, at the end of the work, must be gradual to avoid the thermal excursion
sudden deterioration of the rubber or silicone mat.
Another discontinuous chemical fixation system involves the following phases:
1. impregnation of the foulard fabric in solution of the “Angra ™” product;
2. at the exit of the foulard, rolling up of the fabric in the format of a large roll;
3. drying of the branched fabric;
4. development of the product in decatizing or in KD, thanks to the combined action of heat and steam.