Processing that is carried out both wet and dry, lifting the fibers of the warp and weft yarns with gauze with metal points, to give the fabric:
woolly and velvety appearance;
softness and softness;
hairy surface, which hides the weave of the fabric and increases the amount of air incorporated in the fabric;
better thermal insulation properties of the fabric.
The Raising consists of a large drum cylindrical called barrel (see figure A, point 1)
placed on sturdy sides and surrounded by cylinders raising animals (from 24 to 36)
steel pipes covered with metal gaskets with elastic tips, of different fineness and density
based on the type of fabric and the teaseling desired. The raising rolls are moved by
tension ring V-belts constant, to ensure uniformity of power e a homogeneous, light and superficial raising or
energetic and profound of two types: "pile" cylinder (fig. A, 2) and "counter-pile" cylinder (fig. A, 3), normally
alternating with each other or a sleeping cylinder and 2 or 3 counter-sleeping. Sleeping ones work energetically
on the surface parallelizing the fibers with points pointing in the direction of the barrel rotation and advancement
of the canvas, the others instead act in the opposite direction and in depth, bringing disorderly into
surface the fibers. Both series turn in the opposite direction to the barrel with independent speeds
between them and variable with special variator units.
Reducing speed to the sleeping cylinders there is greater raising due to the direction of the
tips with respect to the rotation of the barrel. While those to contropelo 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 rolls and the fabric.
The feed speed of the fabric is regulated by a series of conveyor cylinders and a cylinder
wrinkled (fig. A, 4) which prevents the fabric from slipping 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 equipped with steel points
flexible, called "brushes", touch the sleeping and counter-pile cylinders, at the point where the barrel does not
it touches the fabric, sharpening its points and cleaning them of the fiber residues that a suction box, placed
also under the barrel, conveys in special bags.
The perfect leveling of brushes and cylinders is an important operation that avoids inhomogeneity
of rubbing the tips.
The current machines also have an inverter to work the right and wrong sides of the fabric
and allow the process to be repeated with continuous "trains" of raising.
They employ two series of complete raising groups: in these the fabric is worked by the first group
on the wrong side and then on the second side, placed in the upper part which gauze the right side of the fabric.
The operation must be repeated until the desired hair effect is achieved. This processing can
be associated continuously with a topping machine.
Based on the characteristics that the fabric must have, the raising process 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 drop in weight.
The knitting gauze must be equipped with special widening groups at the entrance.
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