A brief discussion on heteroshrinkage composite polyester fiber
As a fiber produced by laminating similar or non-similar fibers by spinning, stretching, twisting, etc., the development of different shrinkage laminated polyester has greatly improved the simulation level of fiber in my country. Its series The products are uniformly dry and fixed in length, ensuring the flatness and shrinkage of the fabrics produced by downstream enterprises, and ensuring that the semi-finished products of each process are the same as above and below during finishing, thereby improving efficiency, reducing energy consumption and saving costs.
One-step method or two-step method
At present, the one-step FDY/POY differential shrinkage laminated spinning process technology is mainly used for differential shrinkage laminated polyester. This technology has the advantages of low equipment investment, short process flow, low production cost, high-speed production, stable product quality, and various The components and properties can be matched at will.
The industrialization of such an advanced process technology is not a simple matter. Jiangsu Silk Differential Chemical Fiber Technology Co., Ltd. has been working on it for several years in order to solve the problem of industrialization of one-step differential shrinkage mixed fiber yarn. Sun Derong, chairman of Silke, told reporters that there is no problem in theoretical calculations, but factors such as actual process, operator skill level, equipment accuracy, temperature changes, etc. all affect the progress of research and development. After more than two years of hard exploration, a product that was originally unimaginable was finally made.
“We have designed a one-step process of parallel spinning of POY+FDY on the same machine and high-speed lamination network with multiple machines in one. We have made breakthroughs in key technologies such as lamination point tension matching, precise control of differential shrinkage, and high-speed multiple networks. We have developed key equipment such as dedicated synchronous spinning, synchronous winding, double air chamber and double air duct side blowing system, multi-head precision high-speed winding head, etc. For the first time, we established a website to test and evaluate the product’s differential shrinkage performance, and researched a step forward. With the best fabrics and technical conditions for dyeing and finishing, a number of one-step shrinkage mixed fiber yarn production lines have been built, and large-scale production has been achieved. It reduces labor, space, electricity consumption, and water consumption, and conforms to the low demand. The development trend of carbon economy is in line with the country’s industrial policy,” said Sun Derong.
Although the one-step method of producing different shrinkage laminated polyester is the mainstream in the market now, the products produced by the two-step method also have characteristics and advantages. Cui Li, director of new product research and development of Xinfengming Group Co., Ltd., told reporters that the speed of Xinfengming’s flat pulling machine is generally 700 to 900m/min, and the network pressure of the different shrinkage lamination yarns can be adjusted according to customer requirements to meet the weaving network of different fabrics. degree requirements; the drafting multiple and qualitative temperature can also be adjusted to meet customers’ different boiling water shrinkage requirements; various semi-finished, finished, and cationic different shrinkage bonded fibers can also be customized according to customer requirements.
Whether it is produced by one-step or two-step methods, different shrinkage laminated polyester has excellent covering performance, excellent coloring performance, high bulk and soft feel. At the same time, because the fiber surface has many Silk loops, thus also removing the perfect defects of chemical fiber silk fabrics. After finishing, it can be made into high-end woolen fabrics, spandex jersey, high-end peach skin brushed fabric, woven linen, crystal linen, chiffon, washed velvet, Zhigong cloth, prince cloth, etc., which are the best choice for T-shirts and thermal underwear. Ideal raw material.
Clear pattern and broad prospects
As a new type of differential chemical fiber, heteroshrinkable polyester has a very good market development prospect. At present, some well-known large-scale chemical fiber companies in China have been involved in this field, such as Zhejiang Tongkun Group, Jiangsu Hengli Group and other enterprises. On the one hand, companies can transform existing traditional equipment to produce new types of different-shrink laminated fibers. On the other hand, they can cooperate with domestic textile machinery manufacturers to develop special equipment for different-shrink laminated fibers to develop new types of different-shrink laminated fibers. Gradually, heteroshrink fibers will form an industrialized pattern and be used in more and more chemical fiber market areas, gradually being accepted by the market.
The new type of different shrinkage laminated fiber is a breakthrough in the application and development of general chemical fibers in the field of clothing fiber materials, that is, the improvement and improvement of general chemical fibers, making them closer to natural fibers and easier to produce and finish. People expect chemical fibers to have the excellent properties of natural fibers while maintaining their high strength and uniformity. Therefore, high elasticity, easy coloring, moisture absorption, bulking, and improved luster have become the goals pursued by general chemical fiber deformation and modification. Its future development areas and patterns are as follows: using high elastic shrinkage technology to manufacture high shrinkage yarns, Low-shrinkage yarn is made using the setting elongation technology, and the two are combined into one to make super-double shrinkage multi-differential bonding yarn, which is mostly used for thin piles and new simulated silk fabrics.
The development of three-different (foreign fiber, special-shaped, double shrinkage) polyester and multi-different polyester. Due to its characteristics of different fiber sizes, special-shaped cross-sections, double shrinkage, and fine single-filament fineness, Sanyi fiber is already a good fabric for imitation silk, peach skin brushed, imitation deerskin, and imitation wool fabrics. The fabric feels soft and delicate. Characteristics such as , fullness and comfortable wearing are the current focus and direction of the development of differential chemical fiber fibers in mainland China.
Functionalization of bi-shrunk multi-heterogeneous laminated filaments. As a low-shrinkage component, functional fibers appear on the surface of fabrics after boiling water treatment, providing excellent coverage, fire protection, and antibacterial properties.
Crimping of low-shrinkage component filaments. At present, although a large number of coils appear after double shrinkage and multi-heterogeneous bonding wire is treated with boiling water, the number of coilsThe shape can only be a curved shape due to the shrinkage and extrusion of both ends, and the curved part is not curled. For example, PET/PTT laminating yarn, a fiber with curling properties, can be used as a low shrinkage component to counteract the high shrinkage. Polyester filament mixed fiber is combined into double shrinkage yarn, which will make the hand feel softer.
Double shrinkage and multi-differential lamination yarns are short fiberized. Mostly used for imitating linen and wool.
The development of high double shrinkage laminated yarn. The shrinkage difference is increased by spinning different raw materials or modifying polyester raw materials.
Cui Li introduced: “Currently, Xinfengming has formed an annual production capacity of 38,000 tons of differential shrinkage laminated polyester. Next, we will direct melt spinning of two lines of Zhongxin Chemical Fiber, a subsidiary of the group. The line has been renovated to produce different-shrinkage laminated polyester. It is estimated that our production capacity of different-shrinkage laminated polyester will reach 80,000 tons per year in 2013.”
Sun Derong told reporters that Silke will also add 4 differentiated mixed fiber laminated yarn production lines this year, with an annual new laminated yarn production capacity of 40,000 tons, sales revenue of more than 600 million yuan, and profits and taxes of nearly 100 million yuan. , creating more than 300 new jobs.
The relevant person in charge of Jiangsu Hengli Group told reporters that its one-step differential shrinkage laminated polyester production capacity still has room for expansion in the future, and also raised his concerns: the early sales of differential shrinkage laminated polyester have led to the country following suit, and simply enter Vicious competition.
The relevant person in charge of Tongkun Group said that the company’s new shrink-laminated polyester will gradually expand its industrialization level in the next five years, and it is estimated that the output will reach 35,000 tons/year by 2018.
As for future progress, relevant experts in the industry said that within a certain period of time (estimated to be within 5 years), new products cannot replace the traditional two-step iso-shrink bonding fiber. will exist for a long time and dominate the market. In the next 5 to 10 years, the technical bottleneck of the new product heteroshrink fiber will be gradually overcome, the advantages will be brought into play, and it will gradually occupy the market and be accepted by the market and customers. It will gradually become the leading product of heteroshrink fiber. The traditional two-step method Different shrinkage fibers will be gradually phased out.
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