As the saying goes, “If you do something, love something”, you need to do the industry you are engaged in well and do it well. In fact, it is not simple. In addition to strong interest, solid basic professional knowledge is the top priority. An excellent salesperson can not only perform freely in work and communication, but also have a solid professional knowledge base, which will also add a lot of points to the salesperson’s comprehensive ability.
Although professional basic knowledge is important, most things will be ignored or forgotten by everyone. The product types are unfamiliar, there are too many specifications that are not understood, the advantages and disadvantages of each type of product are unclear, and the reasons for product quality problems cannot be analyzed. etc. are the direct consequences of not being familiar with basic professional knowledge. Therefore, the understanding and in-depth knowledge of professional basic knowledge is particularly important for every salesperson.
1. Introduction to spandex yarn
Cotton and spandex constitute spandex core-spun yarn.Spandex (alias: polyurethane fiber) and spandex core-spun yarn are high-quality raw materials for the production of health-care stretch fabrics. It consists of cotton and spandex. Composition. Spandex is inner thread (covered), spandex The core-spun yarn is made of a variety of fibers and can be used as outer yarn, such as cotton T/C, CVC, T/R including wool, modal, and spandex yarn according to the customer’s needs for different fabrics: Lycra, Elesbon, Dong. China, the brand is currently produced in many domestic factories.
Currently, commonly used yarn counts are 16+70D, 10+40D, 12+70D, 12+40D, 16+40D, 16+70D, 21+40D, 21+70D, 32+20D, 40+40D ,40+2 0D, 50+20D, 60+20D. Spandex core-spun yarn has a wide range of uses. It is one of the main raw materials for stretch denim, corduroy, strong poplin and women’s clothing fabrics on the market, and the fabrics made are also widely used because of its unique characteristics. For the production of commonly used items
2. Advantages of spandex yarn
Spandex core-spun yarn elasticity and durability, breathability, strong hygroscopicity and other advantages. Spandex core-spun yarn has its own unique advantages, with relatively high technological content and strict spinning process requirements. It also has excellent elasticity, durability, breathability, and strong hygroscopicity. Therefore, it has a wide range of uses in the market, and the finished fabrics made from it are deeply loved by manufacturers and consumers.
Elastic yarn is divided into two categories: covered elastic yarn and core-spun elastic yarn. The covered elastic yarn is composed of a polyester filament and a spandex, which are mechanically connected by dots in the spandex and polyester filament. After coming out, elastic yarn is mainly formed: 100D+40D 200+70D 300+40D. 300+70D. The covered yarn is divided into empty package and machine package. The machine package is nylon yarn. The spandex core-spun elastic yarn is formed by wrapping the spandex yarn with the outer fiber, so the uses are different. Same.
Three. Problems that are prone to occur during the weaving, printing and dyeing process of spandex yarn
Different yarn draft ratios and uneven evenness are the main causes of cloth surface problems.Spandex core-spun yarn is generally used as weft yarn in weaving. In the finished product, there are mainly the following situations: The width of the fabric is irregular, the fabric is uneven, the elasticity is poor, and the rebound is not in place, resulting in wide leakage spots (white spots) on the fabric.
The main reasons for the uneven width and unevenness of the cloth are: in the same batch number, the yarn draft ratio is different, and the yarn dryness is uneven; on the air-jet loom, the width will also be different, and the cloth will be uneven. The reason for the uneven surface is that when the two nozzles are used to spray air, the air volume of the two nozzles is different, and the yarn feeding process is faster or slower, resulting in differences in the rebound of the spandex core-spun yarn on the cloth surface; mixed batchesIt’s a serious one. Ninety-nine percent of the time, the door width will become narrow; in the spandex core-spun yarn, there is a section of yarn without spandex yarn (we call it hollow yarn), mainly because the yarn on the guide plate breaks during the spinning process, and the roller keeps Ribbon roving is formed in the spinning thread.
On the cloth surface, the white spots that appear after dyeing are the spandex core-spun yarn. During the production process, the bell mouth and the guide plate are not on the same line, causing the finished spandex yarn to leak out. We call this eccentricity yarn; if the door width does not meet the requirements, the main reason for the narrowing of the door width is that the spandex core-spun yarn is too elastic and the warp density is too thin, and the principle is opposite.
When the above situation occurs, when taking orders or selling elastic yarn, you must communicate well with customers and make calculations The width of the upper machine and the width of the lower machine can be adjusted to achieve multiple warp and weft densities. The spandex yarn factory will adjust the draft ratio of the spandex yarn according to the fabric surface during the production process so that it will not affect the finished width during weaving.
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