Pretreatment Means Of Spandex Fabric

Predetermined shape

In order to improve the running performance of spandex in spinning, silicone oil lubricants and other auxiliaries were used in weaving process.

These auxiliaries will naturally degrade over time, resulting in yellowing of fibers and elasticity of fabrics.

At the same time, spandex fabric will form "cold setting" in long-term storage, resulting in permanent wrinkles which can not be eliminated in fabric processing.

So,

In addition to reducing storage time, it is more important to open the width immediately after weaving.

Avoid the opportunity to generate creases.

The Spandex Knitted fabric contains some spandex inside the fiber and the internal stress formed during weaving.

Therefore, the purpose of preheat setting is to eliminate stress through the relaxation process of the fabric, so that the size of the fabric is sufficiently stable and the permanent creases in the fabric are eliminated.

If the coils formed during the weaving of the cylinder, the second coils are on the left side of the first coil, then the direction of the incoming cloth should also be 7% to 10% (relative width) of the left front, so that the torsion of the finished product is consistent.

Therefore, the best preset plan is: relaxation to steam (without steam conditions of 80 degrees hot water) to super feed preformed to (before fabric pretreatment, shape to printing).

Most dyeing mills directly enter the shape of the water without steam equipment. When the temperature is below 10 degrees (winter), it is easy to crease the spandex fabric.

The fabric will be shaped after loosening through the steam box, and the result will be satisfactory.

The heat setting temperature is between L85 and 190 C, and the setting time is 45~60 S.

The setting temperature is too high, which will make the fabric yellowed.

At the same time, if the impurities and auxiliaries on the fabric are partially degraded due to the influence of baking, the degradation substances will be removed once they are moved into the fibers, and these spots will be difficult to remove in the posterior processing. The stains inside the fibers will first absorb the dye, while in the process of heat preservation and dyeing, they will not be able to run out in time to form deep stains. Even if they are further dyed and dyed again, they will remain on the fabrics. Therefore, avoid the high temperature predetermined shape of 195 degree Celsius, and at the same time, it will also affect them.

Fastness.

The width of the shape is l0% to l5% wider than that of the grey fabric, so that it has a full recovery in the pretreatment of the dyeing cylinder, so that the stress in the fabric is completely eliminated.

Pre-processing

Knitted fabrics need to be printed should also be pre treated to remove impurities such as cotton stains and waxes and waxes. This will increase the whiteness of fabrics and improve the wetting and water absorbing properties of fabrics, so as to achieve good printing effect.

The pretreatment process can be divided into two main categories, namely, traditional alkali treatment and modern biological enzyme treatment, and biological enzyme treatment accords with the requirements of environmental protection. However, at present, it is still difficult to meet the requirements of high whitening or bleaching requirements. Therefore, the conventional alkali treatment process is still widely used, and the gradual washing of water after washing with spandex fabric is very necessary, so as to prevent sudden cooling from causing fiber shrinkage to crease.

Setting requirements for semi finished products

The setting must be carried out according to the original design process. Generally speaking, the width of the setting is 3% to 5% wider than the width of the finished product, and the shrinkage of the finished product is controlled within the shrinkage requirement of the finished product. The elongation of the cloth is equal to the magnification proportion when drawing the manuscript.

If it is a single side knitted fabric, it also needs the control of the blade trimming and the optimal twist control, so as to reduce the printing bias due to twist.

The width of the pulp edge is about LCM, broken point pulp.

It should not be too thin or too thick, too thin to play the proper role. Too thick will affect the printing effect near the edge.

Due to the retention of solid paste on the cloth surface, the square Mick quality of the fabric will be increased, so the quality of the printing can be slightly lighter under the conditions of width and shrinkage.