How to increase yarn strength? During the production and processing of yarn, there will be many processes and many problems will be encountered. Among these problems, color and texture are the added value, and the physical properties of the yarn are the core issues. If the physical properties of the yarn (such as strength ) is affected, and then the beautiful colors and good textures are all castles in the air and no longer exist.

1. Pay attention to the properties of raw materials:

Such as length, fineness, breaking length, maturity, short fiber content, etc. The fiber length is long, the uniformity is good, and the fiber fineness is fine. The more fibers on a unit cross-section, the higher the twisting efficiency, the higher the yarn strength and the smaller the strength unevenness; the larger the fineness unevenness, the lower the yarn strength.

2. Improve the spinning process:

(1) The influence of the pre-spinning process on the strength of the yarn: Reasonable selection of the opening and impurity removal process parameters in the cleaning and carding process, under the premise of sufficient opening and carding, avoid excessive fiber damage, and eliminate short piles and impurities as much as possible. .

(2) At the same time, control the difference in the ration of cooked sliver, reduce the ingot difference of winding elongation, strengthen the maintenance and basic management of equipment, and reduce the generation of weak rings.

(3) Reduce the property difference rate of raw materials, enhance the uniform mixing of raw materials in pre-spinning, improve the carding effect, increase the mixing between single fibers, increase the number of combinations in the combing and drawing processes, etc., and the raw material components are evenly distributed in the yarn. , so that the strength of each fiber of the yarn can be reasonably and fully utilized during the stretching process.

3. Improve yarn uniformity:

Such as weight unevenness, unevenness and unevenness of twist, etc. affect the evenness of spun yarn, mainly in the process of the front area and the reasonable distribution of the friction field, the distance of the front drafting area, the length of the floating area, the apron The size of the jaws, etc., the unevenness of the yarn weight per 100 meters is controlled within 2%, the unevenness of the lap is within 1%, and the rate of combed short staple is within 8%, which can improve the unevenness of the yarn weight. The speed consistency between spindles is the direct factor that affects the uneven twist of the yarn. The spindle belt and splice method, and the spindle belt tension device are the basis for ensuring the stability of the spindle speed. The improvement of yarn strength should start from the reasonable selection of raw materials, reducing mixing differences, improving the quality of pre-spun semi-finished products, improving semi-finished products and yarn structure, improving spun yarn evenness and rationally selecting twist coefficients.

4. Optimize the yarn structure:

For example, the straightness and parallelism of the fibers and their arrangement and distribution in the yarn, the twist of the yarn, etc., the tension, width, tightness, fiber arrangement and straightening of the strands before twisting have certain effects on the yarn strength. influence. Compact spinning is a good method to improve the structure of the beard before twisting, reduce the hairiness of the finished yarn and improve the strength of the yarn.

Yarn tenacity is a reflection of the inherent quality of the yarn and is a necessary condition for the yarn's processability and end use. The quality index is the main basis for determining the pure or blended yarn of cotton yarn or cotton-type chemical fiber, so the yarn strength is one of the most important routine inspection items in textile production.