Definition of Heat setting finishing
(1) Definition: At a certain temperature of the setting machine, a variety of physical or chemical reactions are produced by using some machines and auxiliaries to remove the internal stress of the fibers in the fabric, stabilize the fabric in a certain size, reach a reasonable specification (sealing degree, weight, shrinkage, twist, etc.), and improve the flatness and hand feel of the fabric.
Shortly:
1. Control specification
2. Control shrinkage (transverse, straight) and torsion
3. Improve the hand feel
4. Adjust the fabric pattern
5. Special heat setting finishing
* The special treatment that needs to be done in the setting department is as follows: waterproof, deodorant, anti bacteria, anti pollution, anti wrinkle, anti-static, anti infrared, anti ultraviolet, fragrance, cool treatment, quick drying
(2) Type:
A Reversible heat setting: After the cloth is set, after washing, it can basically return to the state after washing before setting, for example: all cotton common setting.
B Irreversible heat setting: After the fabric is set, after washing, it can't return to the state after washing before setting, for example: embryo cloth setting, resin setting, etc. (embryoid is a kind of heat curable type)
(3) Heat setting temperature:
A. Cotton color cloth: usually set at 150 ℃
B. Bleaching cotton fabric: usually set at 150 ℃
C. T / C, CVC, etc. contain poly component, nylon component: light color 130 ℃ deep medium color 110 ℃ below set (to avoid poor washing water fastness)
D. Artificial wool： Generally, 110 ℃ setting (thermoplasticity setting) is adopted
E. Embryo cloth setting: usually set at 190 ℃
F. Resin setting: usually 170 ℃ x 20 "setting
(4) How to control the specification of setting machine
1. Heat setting machine working principle:
Fabric driving --- Padding --- Overfeed --- Tenter system --- Chamber and hot air supply --- Fabric exit
In the process of fabric processing before finalization, there are many mechanical effects, which often cause fabric warp elongation, weft shrinkage, uneven fabric sealing and weft skew in varying degrees. The fabric can reach a uniform and stable fabric size after finishing with a stenter. With the help of the plasticity of the fabric under the hot and humid bear to a certain extent, the irregular fabric will become more regular after being wetted, stretched and stretched by the setting machine, and then it will reach the required specifications under the direct and horizontal adjustment of the overfeeding system and the stretching system, and under the certain thermal effect of the hot air.
The over feeding device can make the feeding speed of the fabric larger than the running speed of the needle chain, so that the fabric will not be stretched in the warp direction, but the shrinkage of the fabric will be reduced. Stretch setting is to widen the fabric to the specified size by mechanical action, eliminate part of the internal stress, adjust the state of warp and weft yarn in the fabric, so as to obtain temporary setting.
2. The evolution of specifications on the setting machine
Specification before setting ---- stretch adjustment, overfeeding adjustment, needle holder adjustment, temperature setting and hot air setting, machine setting, fabric tension adjustment ---- specification after setting
