Polyester sewing thread and artificial silk thread need to be oiled before winding dyeing. Its purpose is to make the surface of the silk thread lubricious and beautiful. The additives required for post-treatment have the functions of deepening, smoothing, and enhancing the cohesive force of the fibre, especially the high-temperature resistance anti-fuse function.
Because of the advancement of high-speed sewing skills, the machine sewing speed target is above 4000 stitches/minute, and some even reach more than 10,000 stitches/minute. The sewing thread passes through the needle hole at high speed and generates heat by friction, causing the needle to heat up and the thread to fuse, causing the operation to stop. Therefore, the chemical treatment of sewing thread is necessary to meet the requirements of ultra-smooth, anti-friction, and high-temperature resistance.
Ⅰ. The softening agent for thread products: processing requirements
It is not as high as other fabrics. On the contrary, if it is too soft, it will increase the resistance coefficient of the thread. In addition, softness is related to looseness. Excessive softness causes the fibers to spread out, which will inevitably affect the cohesive force of the thread. Therefore, the softness of the thread products should be moderate and soft with rigidity, patience and elasticity.
Ⅱ. The softening agent for thread products: smoothness requirements
It is usually considered first. After years of research and development and sales, the methods to check the slippage of line products are as follows:
1. When the pulling force is insufficient, the float tube will collapse and slip off when winding the drum.
2. The yarn turns smoothly.
3. Tie the end of the thread with a knot, tighten the thread and push it forward at a distance of 10-15 cm from the end of the thread, and the end of the thread rarely rotates.
4. Assuming that the hand feels greasy and slippery, the skein is intertwined. Otherwise, it will affect the yarn winding and contaminate the fabric in severe cases.
Ⅲ. The softening agent for thread products: deepen
The deepening of silicone is because siloxane changes the refractive index of the raw material, not because it darkens the color. Therefore, for excellent deepening, light colors should be lighter and dark colors should be darker. Silicone has a greater impact on the color of a single dye, and it is necessary to consider the effect of post-processing deepening when matching colors.
Ⅳ. The softening agent for thread products: cohesion
The effect of the soft and smooth treatment can not weaken the inherent fiber cohesion of the finished thread. Otherwise, the tensile strength of the wire will be reduced. When planning the line for processing softeners, the cross-linking characteristics of the additives should be considered, perhaps with water-based resins and water-based waxes, further to improve the cohesive force of the finished line.
Ⅴ. The softening agent for thread products: elasticity
The flexibility of the finished thread is related to the data. Take artificial silk as an example. Tighten more than a dozen strands simultaneously, which has good elasticity and will naturally loosen. After tightening, the wire will deform and have good elasticity. After a few minutes, it will naturally return to its original straight line.
In addition, for the comprehensive feel of the softening agent of the thread products, select the special additives, through the compounding, maximize the strengths and avoid the weaknesses, achieve the optimal results, make the induction feel the best, and include the best cost performance. And this is the most significant advantage of compounding skills.