Characteristics Of Polyester FDY
Polyester FDY has the advantages of high strength, good filament tube formation, small fineness, strength, elongation, and uniform dyeing.
1) The surface of polyester FDY is smooth and the internal molecules are closely arranged.
2) The heat resistance and thermal stability of polyester are the best among synthetic fabrics.
3) Polyester FDY has high strength. The strength of short fiber is 2.6-5.7cN/dtex, and the strength of high-strength fiber is 5.6-8.0cN/dtex. Due to its low hygroscopicity, its wet strength is basically the same as its dry strength. The impact strength is 4 times higher than that of nylon and 20 times higher than that of viscose fiber.
4) Polyester FDY has good abrasion resistance. The abrasion resistance of polyester is second only to nylon with the best abrasion resistance, and it is better than other natural fibers and synthetic fibers.
5) Polyester FDY has good light resistance. Lightfastness is second only to acrylic.
6) Polyester FDY is corrosion resistant. Resistant to bleaches, hydrocarbons, ketones, petroleum products and inorganic acids. Dilute alkali resistance, not afraid of mildew, but hot alkali can make it decompose.
7) Polyester FDY has poor dyeability, but has good color fastness and is not easy to fade. The main varieties of polyester are short fiber, drawn yarn, textured yarn, decorative filament, industrial filament and various differentiated fibers.
Polyester FDY Use
Polyester FDY is generally used directly for weaving or warp knitting, and the specifications are generally 50D, 68D, 75D, 100D, 150D, 200D, etc.
It is suitable for the requirements of high-speed warping machine and high-speed shuttleless loom, and can be directly used for knitting and warp knitting. Widely used in spring Asian spinning, polar fleece, single-sided fleece, golden fleece, mercerized fleece, corduroy, flower dot fleece, warp knitted fleece, warp knitted short fleece, warp knitted striped fleece, warp knitted plain fleece, warp knitted fleece Mesh fabric, warp-knitted mercerized silk, loop velvet, velveteen, five-piece satin, polyester taffeta, mercerized silk, water-jet light spinning (simulated silk), water-jet eight-piece satin, weft Oxford cloth, lattice Oxford cloth, jacquard Curtains, printed curtains and other fabrics.
Polyester FDY Physical Index
The following table is the physical index of different grades of polyester FDY products produced by our factory.
| index | dpf≤0.6dtex | 0.6dtex<dpf≤1.0dtex |
| project | AA | A | B | AA | A | B |
| 1 | Linear density deviation rate% | M1±1.5 | M1±2.0 | M1±3.5 | M1±1.5 | M1±2.0 | M1±3.5 |
| 2 | Linear density unevenness CV%≤ | 1 | 1.3 | 2 | 1 | 1.3 | 2 |
| 3 | Breaking strength, cN/dtex≥ | 3.6 | 3.5 | 3.1 | 3.8 | 3.5 | 3.1 |
| 4 | Breaking strength unevenness CV%≤ | 5 | 9 | 11 | 5 | 8 | 11 |
| 5 | Elongation at break% | M2±4.0 | M2±5.0 | M2±7.0 | M2±3.0 | M2±5.0 | M2±7.0 |
| 6 | Unevenness of elongation at break CV%≤ | 10 | 16 | 19 | 10 | 16 | 19 |
| 7 | Boiling water shrinkage% | M3±0.8 | M3±0.8 | M3±1.2 | M3±0.8 | M3±0.8 | M3±1.2 |
| 8 | Dyeing uniformity (gray card) level≥ | 4.5 | 4 | 44624 | 4.5 | 4 | 44624 |
| 9 | Oil content % | M4±0.2 | M4±0.3 | M4±0.3 | M4±0.2 | M4±0.3 | M4±0.3 |
| 10 | Evenness CV%≤ | 2 | 2 | 2.5 | 1.8 | 2 | 2.5 |
| 11 | network degree/m | M5±4 | M5±6 | M5±8 | M5±4 | M5±6 | M5±8 |
| index | 1.0dtex<dpf≤5.6dtex |
| project | AA | A | B |
| 1 | Linear density deviation rate, % | M1±1.5 | M1±2.0 | M1±3.5 |
| 2 | Linear density unevenness CV,%≤ | 0.8 | 1 | 1.8 |
| 3 | Breaking strength, cN/dtex≥ | 3.8 | 3.5 | 3.1 |
| 4 | Breaking strength unevenness CV,%≤ | 5 | 8 | 11 |
| 5 | Elongation at break, % | M2±3.0 | M2±5.0 | M2±7.0 |
| 6 | Unevenness of elongation at break CV,%≤ | 8 | 15 | 17 |
| 7 | Boiling water shrinkage, % | M3±0.8 | M3±0.8 | M3±1.2 |
| 8 | Dyeing uniformity (gray card) level≥ | 4.5 | 4 | March 4 |
| 9 | Oil content, % | M4±0.2 | M4±0.3 | M4±0.3 |
| 10 | Evenness rate CV, %≤ | 1.5 | 2 | 2.3 |
| 11 | Network degree, units/m | M5±5 | M5±6 | M5±8 |
Polyester FDY Production Process
The preliminary preparation of polyester FDY process operation mainly includes two parts: the preparation of raw materials and the basic equipment: the raw materials of polyester FDY mainly include PET chips, color masterbatch and FDY oily agent. The required equipment mainly includes continuous PET cleaning and drying equipment for drying PET chips, screw extruder, pre-pressing filter, spinning box, color masterbatch injection machine, and automatic tensile tester and other large-scale equipment. instrument. These raw materials and equipment are the basis and guarantee for the smooth and effective production process of polyester FDY.
The production process of polyester FDY is roughly as follows: First, the PET chips and color masterbatch should be dried, the masterbatch should be dried directly, and injected with a masterbatch syringe. The PET chips should be pre-crystallized first, then dried, and then The two are mixed in a certain amount and proportion, and the obtained mixture is extruded in the prepared screw extruder, and then the melt is filtered, placed in the spinning box, and subjected to side blowing. Oil the oil roller, heat the roller, form a pre-network, stretch, shape, and finally roll to form the finished FDY. The following briefly discusses the precautions and operations in the production process of polyester FDY.
1 Drying Of PET Chips
The selection of PET chips is also an important part of the FDY yarn production process. The selection criteria are the specified intrinsic viscosity and end value. After selecting the PET chips, an important step is to select appropriate conditions to dry them. If the drying conditions adopted are not suitable, it will have a great impact on the results of the slicing, and it will also interfere with the formation of the final polyester FDY. Therefore, the selected drying conditions should ensure that the various indicators of the dried slices meet certain requirements. , First of all, the moisture content should not be too high, the water mass fraction must be lower than 20×10-6, and secondly, the intrinsic viscosity should be less than 0.005 dL/g. Tests have shown that in order to achieve such a standard, the general pre-crystallization temperature should be At around 170°C, the drying temperature of the drying tower is around 165°C.
2 Drying Of Masterbatch
Like PET chips, the drying treatment of color masterbatch also requires high drying conditions. Continuous drying treatment of color masterbatch is required. The indicator after drying of color masterbatch should be the color masterbatch water obtained after drying. The mass fraction should be 25×10-6 lower. If you want to achieve this effect, the selected drying conditions should control the drying temperature at 125°C to 135°C, control the drying time at 5h, and continuously adjust the drying time during the 5h period. The masterbatch is dried.
3 The Temperature Required For Polyester FDY Spinning
In the production of polyester FDY, not only a specific temperature is required for the drying of PET chips and masterbatches, but other operating steps also require a high temperature of the instrument, among which the temperature of the screw extruder and the spinning box has an impact on the formation of FDY. If the temperature is too high, the mixture will be easily degraded at high temperature due to the addition of dyes to the PET melt. The more dyes are added, the more obvious the degradation phenomenon. Therefore, the temperature of the screw extruder and spinning box is slightly lower than that of ordinary spinning to ensure that the PET and fuel mixture is not degraded.
4 The Pressure Problem Of The Pre-Filter
As a raw material of the FDY production process, the color masterbatch causes the equipment to rapidly increase the pressure when the mixture with PET chips is filtered in the pre-filter, so the filtration cycle of the filter is required to be shorter, and the pressure after filtration is higher than ordinary The pressure setting of conventional spinning is large, and the pressure is generally reached after filtration. When the pressure increases, the rotation speed of the screw is also accelerated, which can make the mixture of raw materials and dyes quickly and uniformly mix in the screw, so as to reduce the color difference and improve the performance of the product.
5 Cool Down
When it is cooled by side blowing, the size of the wind speed directly affects the product performance of polyester FDY. If the wind speed of the blowing is properly selected, the evenness rate of the obtained polyester FDY will decrease, and the tension and strength of the tow will be greatly improved. If the wind speed is low, the tow is not easy to cool, the process is long, and it is easily affected by the outside world, resulting in uneven products and poor quality. It will cause uneven product formation and cannot form high-quality products.
6 Problems Related To Winding And Shaping
There are still many problems that need to be paid attention to in the final process steps of polyester FDY formation. First, the temperature of the hot roller should be properly selected. The temperature of the hot roller is mainly divided into two parts: stretching temperature and setting temperature. The stretching temperature should not be too low. If it is too low, there will be no stretched filaments. It should be selected above the crystallization temperature, but not too high, which will make the tow jitter too large, resulting in uneven colored filaments; the setting temperature should also be selected appropriately. If the temperature is too high, there will also be a common problem that the tow shakes too much during the formation process. If the temperature is too low, the crystallization effect will be poor, the crystallization will be uneven, and the product quality will be poor. Secondly, there must be a suitable winding angle. The winding angle will determine the final formation effect of polyester FDY. If the angle is too large, there will be mesh holes, and a better and complete silk cake cannot be formed. If the angle is too small, the silk layer will not be formed. Obviously, a bulging belly will be formed. Tests have shown that the optimal winding angle should be around 6° to 7°.
Polyester FDY Manufacturer - Salud Style
We are a polyester FDY manufacturer who manufactures and supplies high-quality polyester FDY in different colors and specifications at competitive prices. We offer our customers tailor-made solutions that meet their specific requirements. Our products are reliable and performance-oriented.
Our products are used in a variety of applications, such as clothing, home furnishings, and automotive components. Please feel free to contact us for more information about our products or for any other inquiries related to the textile industry.
