Stretch denim craft

First, the requirements of elastic denim fabric

Finished product width fluctuation 1.5CM, weft bomb 8 to 12% micro-shells, 12 to 16% shot, 16 to 22% high bomb

Second, the impact of elastic denim fabric width and retraction factors

Elastic yarn

A. Spandex: Spandex belongs to polyurethane fiber. It is a kind of high elasticity fiber. Its biggest feature is high elongation at break and it can quickly return to original shape after being loosened. Compared with an elastic yarn, spandex is more roving The greater the linear elasticity, the higher the spandex yarn, the higher the yarn elasticity;

B. draft multiple: refers to the spandex filament elongation in the spinning process, the greater the draft multiple yarn elastic force is better, spandex yarn specifications are different, the draft multiple is also different, under normal circumstances the draft multiple 40D For 2.5 to 3.5 times, 70D is 3 to 4 times.

C. Number of counts: Due to the limitation of the outer layer yarns on the spandex yarn, when the same type is produced, under the same process conditions, the finer and more flexible the yarn yarns of the elastic yarns, the thicker the weft yarns are, the smaller the weft shrinkage is. .

2. into cloth technology

A. warp density: the more dense, the smaller the shrinkage latitude rebound small, on the contrary the smaller the more dense shrinkage latitudinal rebound;

B. Weft density: elastic variation and the same density, weft big rebound is small, weft small rebound is small;

C Fabric organization: mainly related to warp and weft yarns, the shorter the warp and weft yarns are, the shorter weaving length is, such as plain weaves and three twill weaves; the longer wefts and wefts are, the longer weaving is, the larger weaving is, such as four twills, Coarse twill, various irregularities, etc.

Finishing process

A. Tension: increase the tension of the entire process, in particular, to increase the tension ramp, pre-shrinking into the cloth Department of tension, can effectively reduce the zonal rebound;

B. Temperature: The higher the temperature at the singeing, slurry tank, pre-drying cylinder, the rubber blanket drying cylinder, the felt drying cylinder, etc., the more favorable the full retraction of the weft yarn, the smaller the directional rebound;

C. Time: Appropriately reducing the speed of the vehicle and prolonging the anti-shrinkage time can effectively increase the wet heat treatment time of the elastic yarn, which is beneficial to the full retraction of the spandex yarn and reduce the rebound in the zonal direction.

D. Resurgence: refers to the moisture regain before the fabric into the rubber blanket, the greater the moisture regain, the more fully retracted the weft rebound is smaller, this method can make spandex width ± 1.25CM width changes, while the moisture regain When the small machine is over, it is necessary to prevent the fabric from picking up;

E. stereotypes: the elastic fabric by high temperature treatment, so that the flexibility of spandex to reduce elasticity of the weakened resilience, effectively reducing the zonal rebound, which is the emergence of rebound large width narrow elastic fabric the best finishing method .

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