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- The Rolling Page 61 24/06/2022
- Checking the finished fabric Pag.60 13/06/2022
- The Airo Treatment Pag.59 06/06/2022
- Brushing Page 58 26/05/2022
- The Mercerization P.57 25/05/2022
- Sodating and Bleaching Pag.56 20/05/2022
Mission and Vision
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info
Mobile Phone : +393319020189
Timetables
Working hours: 09.30 / 12.30 - 16.00/18.00 From Monday to Friday.
Purpose of processing
Fixing is a preliminary treatment to finishing processes that stabilizes those types of fabric
which, subjected to the action of water, can distort and deform as a result of tension
internal to the fabric itself.
DISCONTINUOUS FIXING (POTTING). Processing technology and execution
The wide fabric is wound under tension on a perforated roller (see figure A, point 1) placed in the
boiling tank (fig. A, 2) at a suitable temperature, in water with added wetting agent.
A pressure cylinder placed above the roller (fig. A, 3) presses on the rolled fabric.
A special reversible volumetric pump (internal-external and vice versa) (fig. A, 4), ensures a
uniform circulation of the bath through the holes of the rotating roller on which the fabric is wound, in cycles
automated and with a programmable duration from 30 to 60 minutes.
Once the cycle is finished, the fabric is unloaded by reversing the direction of rotation of the roller and passing
above the pressure cylinder, it reaches two squeezing cylinders (fig. A, 5), then to a tray (fig.
A, 6), where cold water spray nozzles generate a violent thermal shock on the fabric.
Once the treatment is finished, the piece can be stacked (fig. A, 7) or rolled up.
Most recurring defects
The main defects resulting from this treatment are:
differences in treatment between the head and tail of the piece. Re-wash the cloth in the hot bath in the
tail-head direction;
Marbling (“moiré” effect), on the surface, usually caused by
– a local pressure of the cylinders on the tissue,
– too high chain tension which deforms the threads and causes their refraction to vary;
weakening of the fabric due to unsuitable chemical action (chemical fixation).
CONTINUOUS FIXING (CRABBING)
Processing Technology
Procedure that increases the productivity of the treatment and avoids differences between head and tail.
The wide fabric (see figure B, point a) passes through a tray (fig. B, 1) with hot water and
any wetting substances. It is then squeezed by a pair of cylinders (fig. B, 2), guided and laid down
on a drum (fig. B, 3) and covered by an endless cloth (fig. B, b), to rest motionless in the
reaction zone between the heated drum and the sheet.
The higher temperatures, caused by the pressure of the sheet and the particular materials it is made of
compound, cause greater fixation and dimensional stability to the fabric.
Passing through a cold tray (fig. B, 4) generates the stabilizing hot-cold shock.
After squeezing between two cylinders (fig. B, 5), the fabric is collected on pallets or wrapped.
This machine ensures good results without the use of chemicals, guarantees very high productions
high and is useful as a preparation for dyeing to avoid creasing effects.
Processing technology - Continuous fixing
An additional machine for continuous chemical fixing (crabbing) is illustrated in figure C.
The incoming fabric is soaked in a bisulfite-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 exit of the
steam, which in this process reaches temperatures above 100°C.
At the end the fabric passes through a cooling tray (fig. C, 3).
Attention: the outgoing fabric must always be rolled up to avoid indelible streaks
from groundwater.
The speed of the machine is adjusted according to the heaviness of the fabric.
The cooling of the cylinder, at the end of the work, must be gradual to avoid thermal excursions
sudden deterioration of the rubber or silicone material mat.
Another discontinuous chemical fixation system involves the following phases:
1. impregnation of the scarf fabric in a solution of the “Angra™” product;
2. upon exiting the scarf, rolling the fabric into a large roller;
3. drying of the stenter fabric;
4. product development in decatization or KD, thanks to the combined action of heat and steam.
Services
After the sale of the machinery, we also assist you in logistics and, if desired by the customer, we have technicians capable of reassembling and starting up the machinery.
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