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- Rolling Page 61 24/06/2022
- Checking the finished fabric Page 60 13/06/2022
- The Airo Treatment Page 59 06/06/2022
- Brushing Page 58 26/05/2022
- Mercerization Page 57 25/05/2022
- Sodium plating 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
Processing that is carried out both wet and dry, lifting the fibers of the warp and weft yarns
with gauzes equipped with metal tips, to give the fabric:
woolly and velvety appearance;
softness and softness;
hairy surface, which hides the intertwining of the fabric and increases the quantity of entrained air
in the fabric;
better thermal insulation properties of the fabric.
Keep it going
The gauze consists of a large cylindrical drum called a barrel (see figure A, point 1) placed on sturdy sides and surrounded by raising cylinders (from 24 to 36)
steel pipes covered with metal gaskets with elastic points, of different fineness and density according to the type of fabric and the desired raising. The raising cylinders are moved by trapezoidal ring belts at constant tension, to ensure uniformity of power and a homogeneous, light and superficial or energetic and deep raising of two types: "hair" cylinder (fig. A, 2) and "counter-hair" "(Fig. A, 3), usually alternating between them
or a cylinder with pile and 2 or 3 with counter-pile. Those with hair work energetically on the surface by parallelizing the fibers with points pointing in the direction of rotation of the barrel and advancement
of the canvas, the others instead act in the opposite direction and in depth, bringing in disorderly
surface the fibers. Both series run in the opposite direction to the barrel with independent speeds
each other and variable with appropriate variator groups.
By reducing the speed of the hair cylinders there is greater raising due to the direction of the
spikes with respect to the barrel rotation. While those against the grain to reach the point of
raising will have to turn faster, to cancel the speed of the barrel that rotates in the direction
contrary to the inclination of their tips.
The degree of raising depends on: type of seals and speed of the raising cylinders and of the fabric.
The speed of advancement of the fabric is regulated by a series of conveyor cylinders and by a cylinder
wrinkled (fig. A, 4) which prevents slippage of the fabric and which by varying speed with respect to the conveyors,
it can act as a brake or as a power supply for this at the point of contact with the barrel. On two
rotating cylinders in opposition to each other (fig. A, 5), two plates per cylinder fitted with steel points
flexible, called "brushes", brush the hair and counter-hair cylinders, at the point where the barrel does not
touches the fabric, sharpening the tips and cleaning them of the residual fibers that a suction box, placed
also under the barrel, conveyed into special bags.
The perfect leveling of brushes and cylinders is an important operation that avoids unevenness
of rubbing of the tips.
Current machines also have an inverter to work the right and the wrong side of the fabric
and allow the repetition of the process with continuous "trains" of garzi.
Raising machines both on the right and on the reverse side (see figure B).
They employ two series of complete raising groups: in these the fabric is worked by the first group
on the reverse and then from the second, placed in the upper part that gauze the right side of the fabric.
The operation must be repeated until the desired hair effect is achieved. This processing can
be continuously associated with a trimming machine.
Based on the characteristics that the fabric must have, the raising operation can take place:
wet, for a very full effect, hair lying all in the same direction and reduced weight loss;
dry, for very confused hair on the surface, more swollen, with greater weight loss.
The gauze for knitwear must be equipped at the entrance with special expanding groups.
Execution of processing
Raising is one of the most demanding and difficult finishing operations. The many adjustments of the
machine, to vary according to the types of fabric, are entrusted to the skill and experience of the raiser.
The raiser must:
check the suitability of the pieces, with particular reference to the tension of the selvedges;
carry out a head-to-tail seam between several pieces when they have to undergo several passages;
To “walk” the fabric over the entire working height of the machine, that is, to move the pieces
from one side of the barrel to the other, avoiding prolonged processing of the fabric in the same position
which would cause a different wear of the seals and defects on the fabric.
This processing device is usually managed and automatically adjusted by
appropriate equipment
manually and visually check the results achieved in relation to the reference sample,
in particular length, density and uniformity of the pile, resistance of the fabric both on the sides
of the piece is in the center.
Most recurring defects
Insufficient strength of the fabric on the sides of the piece, near the selvedges.
Difference in raising (amount of pile) between the center of the piece and the selvedge.
Difference in raising between the two ends of the piece.
Hair streaks due to uneven tension of the pieces during processing.
Non-compliance with the reference sample of the brushed fabric.
Stripes in the direction of the warp, for taut or slow threads that accentuate the color difference between the warp
and plot.
Reduction of fabric height, due to "aggressive" raising and / or excessive tension of the fabric on the
barrel.
Crossing of the pile, for folded fabric in spring raising. It is necessary to win and regarzare.
Labor management
At the end of the work or in case of prolonged stop, the raiser must:
run in the machine with a neutral cloth;
remove the fluff produced during processing with vacuum cleaners and compressed air;
in particular clean the brush and the raising cylinders.
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 the machinery.