Decatizing - Textile Section

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Decatizing

This processing can be carried out with three process modes which differ in the duration of the processing and for the type of effects produced:
discontinuous decatissage at atmospheric pressure;
continuous decatissage at atmospheric pressure;
discontinuous decatissage in an autoclave.
Whatever the mode, the decatissage substantially changes the hand of the fabric on the basis of the support on which the piece is laid, called "sub-piece": the thick, soft and hairy "mollettone" type undercoat gives a woolly and soft touch;
the "silky" type undercoat gives a shiny, rather flattened, silky and stable effect.

Processing technology
Process that gives the fabric a full, compact and sustained hand, also giving it a light touch
dimensional stability and allowing the elimination of any resulting excessive polish
by calendering.
The machine consists of two sides on which the decatrix cylinder is placed (see figure A,
point 1) - in stainless steel or copper, with many small holes over its entire surface, to which they are
tubes applied, facing the inside of the cylinder, which collect any condensation - and a
small cylinder on which the fabric is wound (fig. A, 2) for which the
"Silky" (compact and thin) or the "mollettone" (soft and often due to the raising)
suffered on both sides), chosen according to the type of fabric to be treated and the desired effect, considering
that a greater rigidity of the blanket gives the fabric a more nervous, snappy and
glossy.
The operation begins by wrapping together, on the decatrix cylinder, the blanket and fabric to be treated, which
they are kept tightly adhered by an adjustable pressure roller (fig. A, 3). At the end of rolling up,
it is introduced into the steam cylinder which, passing through the holes, hits and passes through
blanket and fabric rolled together for as long as the operator deems appropriate. Then closed on
steam flow, a pump is activated which, sucking air through the holes of the decatrix cylinder,
determines the cooling of the two fabrics and a more sustained hand. During these two
phases (steam injection and pump operation), the decatrix roller maintains a movement
alternating rotation constant, to move the fabric and favor the penetration of steam and
air. Outside the machine there may be an air cooler (fig. A, 4) for the purpose of
bring the fabric to room temperature. The machine is completed by a suction system, which
eliminates the vapors that come out of the roll formed on the drum.
Finally, the treated fabric is removed while the blanket rewinds on the appropriate cylinder.
The characteristics assumed by the tissues after this treatment will depend on
choice of fabric under the piece,
time of administration of the steam,
cooling time.
Longer time of steam administration and shorter suction with the pump confer
a softer hand to the fabric; the opposite treatment, on the other hand, will cause the fabric to assume one
hardest hand.
Used decatizing

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