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False Twist Crimped Type Yarns

Update:31-10-2022
Summary:

  filtration materials Air particulate matter (Par […]

 

filtration materials

Air particulate matter (Particles) in the atmosphere are a major cause of environmental pollution.

Knitted filtration materials are promising due to their production efficiency and high filtration performance. These filtration materials are made from ground yarns, connection yarns, and weft insertion yarns. Polyester draw texturing yarns were used in the production of a series of CKSW samples.

The particle size distribution in CKSW filtration materials was investigated by passing a sample through a fabric that contained tourmaline particles, which can increase the filtration efficiency of the materials. The resulting samples were then placed under a scanning electron microscope. The surface of the fabric showed fine particles, with diameters of about 0.3 to 10 um. These results show that normal conditions, the surface of the yarn will always contain some impurities. Moreover, these particles will not be evenly distributed.

CKSW filtration materials were developed with novel structures. Besides reducing the number of filtration steps, weft-inserted yarns can significantly improve the stability and strength of the filtration materials. In addition, the pore size and porosity of these filtration materials were measured. They have the potential to significantly reduce the processing time and provide an original idea for the development of new filtration materials.
filament yarn

LOY (Low Oriented Yarn) is a continuous filament yarn spun at a low speed of less than 1000 m/s. It was originally used to produce fully drawn flat yarns. Using LOY filament yarn for draw texturing is ideal for a wide variety of textile applications. It is also available in different lustres and cross sections. This yarn can be used for draw texturing and as a weft. FOY is also commonly used in industrial sewing threads, hose reinforcements, and binder yarn.

By adjusting the feed temperature, the texturing tension and dye uptake are increased. The increase in texturing tension is largely due to crystallization of the POY prior to the draw zone. Another method of achieving the same effect involves adding a hot plate or tube between the POY supply and the standard input roll. In either case, the length of the yarn should be held constant.

LOY filament yarn for draw texturing is a good choice for fabrics where a strong, durable, and weather-resistant fabric is needed. LOY filament yarn can be spun at high speeds and has a high degree of stabilisation. LOY filament yarn is used in sports shoes, sarees, and drapes.
Steam-jet textured yarn

Steam-jet textured yarn has more tenacity and strength than ordinary yarn. It is suitable for a wide range of applications. It is available in various thicknesses, ranging from 30 denier to 200 denier. The texturing process results in irregularities, which can cause havoc in subsequent processes. Although jet texturing reduces the risk of deformation, the yarns may still be unstable when loaded with a small force. Different testing methods are available to assess the stability of textured yarns.

Steam-jet textured yarns are more cost-effective than air-jet textured yarns. They can also be used to manufacture sewing threads. Steam-jet texturing is an economical alternative to air-jet texturing, and can help manufacturers reduce production costs and streamline manufacturing capabilities. The cost of high-pressure steam is significantly cheaper than compressed air.

Steam-jet textured yarns are made with a lower loop density than air-jet textured yarns. This is because steam shrinks the loops of the yarn during the texturing process.
False twist crimped type

The first step in creating false twist crimped type yarns is to determine the proper temperature for the yarn. In general, this temperature ranges between 210degC and 230degC. Then, choose the heat setting. A spindle method is preferred for this process.

False twist crimped type polyester yarns are generally made with a density of 1.3800 grams per cm3, and a total percentage crimp of 30%. These yarns are produced by false twisting a polyester multifilament with a birefringence between 0.030 and 0.145. During the process, the tension, twist, and temperature are varied in order to obtain the desired texture. The resulting yarns are compared in terms of visual appearance, breaking load, and extension.

False twist texturing is the most common technique for producing false twist yarns. False twist texturing involves first twisting filament yarn, heat-settling it again, and then re-twisting it. This process is usually carried out on machines with a single or double heating zone. It is also possible to create continuous textured yarns.

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