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Recent Articles
- 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
Looking for the best opportunities to satisfy the customer:
info
Mobile Phone : +393319020189
Timetables
Working hours: 09.30 / 12.30 - 16.00/18.00 From Monday to Friday.
Purpose of processing
Drying of fabrics is normally required after wet processing (washing, bleaching, dyeing,
printing, impregnation with chemical solutions, sizing, etc.). In the named machine
ramosa or stenter is carried out by hitting the piece with a flow of hot air.
Flat stenters are less effective and are used on light and knitted fabrics, while those with multiple paths are used
horizontal, with entry at the top and exit at the bottom on the same side, are preferred for fabrics
of wool and drapery in general.
Steam, diathermic oil and combustion can be used to heat the air
direct gas. The last two systems are essential in the presence of a heat-fixing section
in which very high temperatures must be reached.
Processing technology
The fabric circulates on the various levels of the machine (four or more, depending on the capacity) via two
continuous chains (see figure A, point 1), on the links of which metal plates are placed with
stainless steel pins on which the selvages are pinned and held flat by two or three small cylinders
selvage unwinders, independently controlled. Two arms are located on the outside of the machine (fig.
A, 2) - within which the continuous chains slide - equipped with electronic feelers to guarantee the correct
positioning of pins and selvages, which, once pinned, support the widening effort
of the fabric.
The fabric passes between two pulleys superimposed on each side (fig. A, 3) which push it, allowing it to
overfeed it with respect to the path of the chains to obtain, if necessary, a greater return to the
sense of length. A brush (fig. A, 4) forces the fabric to penetrate with its weight
deeply from the pins, so that ventilation does not cause detachment and the consequent
automatic stop of the machine. A velvet brush is placed before the edge unwinders
(fig. A, 5), which smoothes and parallelises the fibres, almost always preceded by a weft straightening device
(fig. A, 6) which guarantees straight weaves and well-squared designs.
The fabric falls into the drying chamber from the top and comes out at the bottom, dry and cooled
from a perforated cylinder (fig. A, 7) equipped with a vacuum cleaner, ready to be stacked or rolled
according to the requirements.
Continues
Finned radiators placed on the walls in each of the two semi-vertical sections (fig. A, 8) generate the
necessary heat and two fans and some blowers (fig. A, 9) convey the air onto the patch, into the
first half section (fig. A, a), from bottom to top and in the second half section (fig. A, b), from top
downwards, to obtain perfect drying over the entire height of the fabric.
The hot air, saturated with the humidity of the fabric, is let out through special suction ducts (fig.
A, 10) equipped with adjustable valves, while heat-insulating panels on the surface of the machine prevent
heat dispersion.
At the bottom of the sliding guides, the two gears driving the chains are connected in parallel by
a shaft covered by a cylinder with three periscopic elements (fig. A, 11), which varies the width of the
field of work.
The machine may have automatic systems that set the optimal speed, based on the humidity of the
pieces.
Some types of fabrics need to be wet or need to be soaked with certain products
before being dried. For this reason a squeezer (foulard) is mounted at the entrance
of the ramosa.
Execution of the work
The quality of the workmanship depends on the loading of the pieces on the machine and on their correctness
programming through the control panel. The coppersmith must:
sew the pieces head-to-tail and position them in the center of the machine;
make sure that the piece is presented on the right thread at the entrance, even with the weft straightening device;
make sure that the difference in height between the wet and dry fabric is not excessive, such
to cause the fabric at the selvages to break and the machine to stop.
In this case it is necessary to let the multi-level stenter cool down to enter it and eliminate the stuck fabric
on chain guide and other parts;
avoid that the height of the incoming damp pieces is too higher than the drying height
in this case the action of the fans can detach the selvages from the tips of the chain
(where there are no stopping clamps);
make sure, when the fabric comes out, that the fabric is neither too dry nor still damp;
check the lubrication of the chain and the regular operation of the fans and exhauster
(the latter to avoid condensation drips on the fabric and consequent stains).
Most recurring defects
Output fabric that is too dry or still damp can cause defects in subsequent finishing.
Breaks or tears near the selvedges.
Stains of condensation or oil from lint soaked in the chain lubricating oil.
Lack of the right thread on the fabric.
Horizontal scratches at regular distances, due to excessive permanence of the piece on the machine
in contact with the periscopic cylinders.
Uneven drying between the center and sides of the piece.
Work management
The coppersmith must organize and manage the work to optimize production both in terms of quality and quantity of processed fabric.
In particular, he must check the correct functioning of the machine, carry out daily maintenance and carry out, when the machine is cold (usually on Mondays), a very thorough weekly cleaning.
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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