Elastic hybrid filaments, methods of making and using the same

Abstract

The present application discloses an elastic mixed filament, which is composed of fully-drawing elastic polyester filament A and false twist polyester filament B with different dyeing bases, wherein the filament length ratio of the elastic polyester filament A to the polyester filament B is 1.5-2.0 in the natural coiling state, the network point number of the mixed filament is 130-250 / m, the average opening length of the mixed filament under 25 cN tension is 5-12 mm, and the variation coefficient of the opening length is below 65%. The elastic mixed filament has good opening effect in post-processing, has elongation recovery, and can be used to make fabric with excellent mixed color effect.

Description

Technical Field

[0001] This invention relates to a blended fiber, specifically to a blended fiber formed from elastic polyester filaments and polyester filaments with different dyeing mechanisms, which has a different color effect after dyeing. Background Technology

[0002] In the apparel industry, elastic materials with stretch recovery properties are highly popular due to their comfort and ability to accentuate the shape of form-fitting garments, gradually becoming a market trend. Currently available polyester high-elastic yarns offer stretch recovery, but their color options are limited. Therefore, it is necessary to design a high-performance fiber that combines stretch recovery with color mixing capabilities.

[0003] Chinese patent CN107829165A discloses an ETD high-shrinkage elastic bicolor fiber composed of cationic POY yarn as the first filament and a composite yarn formed from the two components as the second filament. The preferred network density of this fiber is 80 to 130 fibers / m, which achieves a bicolor effect while maintaining high fiber elasticity. However, with typical networks, after applying tension during subsequent weaving, knots easily form in the network section, making them difficult to untie, resulting in inconsistent fiber lengths and poor color mixing. Summary of the Invention

[0004] The purpose of this invention is to provide a blended elastic fiber with good fiber opening effect and elongation recovery in post-processing, and a method for preparing the same. This blended fiber can be used to make fabrics with excellent color blending effect.

[0005] The technical solution of the present invention is as follows:

[0006] The elastic blended fiber is composed of fully drawn elastic polyester filament A and false-twist polyester filament B with different dyeing properties. The ratio of the length of elastic polyester filament A to polyester filament B in the natural winding state is 1.5 to 2.0. The number of networking points of the blended fiber is 130 to 250 per m. The average fiber opening length of the blended fiber under a tension of 25 cN is 5 to 12 mm, and the coefficient of variation of the fiber opening length is preferably below 65%.

[0007] The average length between adjacent network points is preferably 1 to 7 mm, and the coefficient of variation of the length between adjacent network points is preferably below 60%.

[0008] The elastic elongation of the elastic blended fiber is preferably 25-40%, and the elastic recovery rate is preferably 85-95%.

[0009] The polyester filament B is preferably a cationic dyeable polyester filament.

[0010] The number of network points is preferably 150 to 210 per m, the average length of the network fiber opening is preferably 7 to 9 mm, and the coefficient of variation of the fiber opening length is preferably below 55%.

[0011] The average length between adjacent network points is 3 to 5 mm, and the coefficient of variation of the length between adjacent network points is less than 50%.

[0012] The present invention also discloses a method for preparing the above-mentioned elastic blended fiber, wherein the pre-oriented yarn B is fed into the first roller through the same spindle position, heated in the first heating box and then introduced into the false twister, and then fed together with the fully drawn elastic polyester filament A that has passed through the zero roller into the second roller for doubling, and then passed through the networker, the second heating box, the third roller and the fourth roller in sequence, and finally wound to obtain the blended fiber, wherein the overfeed rate of the third roller and the second roller is 3.0 to 6.0%.

[0013] The preferred compressed air concentration in the network device is 3.0–5.0 kg / cm³. 2 .

[0014] The stretch ratio between the zero roller and the second roller is preferably 1.00 to 1.100.

[0015] The elastic blended fibers of the present invention have good fiber opening effect under a certain tension, and the fabrics made from them have excellent color mixing effect after dyeing. Attached Figure Description

[0016] Figure 1 This is a schematic engineering drawing of the method for preparing elastic blended fibers according to the present invention.

[0017] In the diagram: 1. Unextended yarn A; 2. Unextended yarn B; 3. First roller; 4. Hot roller; 5. Second roller; 6. First heating box; 7. Cooling plate; 8. False twister; 9. Third roller; 10. Fourth roller.

[0018] Figure 2 This is a side view of the elastic blended fiber of the present invention.

[0019] Figure 3 This is a diagram of the network structure used in the elastic blended fiber of the present invention. Detailed Implementation

[0020] The blended yarn of the present invention comprises two elastic polyester filaments A and B with different dyeing properties, wherein the elastic polyester filament A is a fully drawn yarn and the polyester filament B is a false-twisted yarn, and the polyester filament B is wound around the elastic polyester filament A, so that the final fabric can obtain both a color blending effect and excellent elongation recovery.

[0021] The different dyeing mechanisms refer to the different ways in which the dye combines with the polyester. For example, when the elastic polyester filament A is dyed using an embedded dyeing method, the polyester filament B can be a polyester dyed using a non-embedded dyeing method, such as a combined dyeing method. The polyester filament B described in this invention is preferably a cationic dyeable polyester filament.

[0022] The ratio of the length of the elastic polyester filament A to the length of the polyester filament B in the naturally wound state is 1.5 to 2.0. If the ratio of the length of the elastic polyester filament A to the length of the polyester filament B is less than 1.5, the elasticity of the resulting blended yarn will be greater, and the elasticity of the fabric will be better. However, if the ratio of the length of the filaments is too small, the elasticity of the elastic polyester filament A and the polyester filament B will be too tight, and the color mixing effect of the fabric will be weak. If the ratio of the length of the elastic polyester filament A to the length of the polyester filament B is greater than 2.0, the elasticity of the resulting fabric will be weaker, and due to the excessive length ratio, the polyester filaments A and B will have obvious branching. The polyester filament A will be too long, and the dyeing pattern of the woven fabric will be too monotonous, failing to form a natural color mixing effect.

[0023] The number of network points in the blended fiber network is 130–250 per meter. If the number of network points is greater than 250 per meter, the elastic polyester filament A and polyester filament B will be too tightly bound, making it difficult to open the fibers under tension, resulting in a poor color blending effect after dyeing. If the number of network points is less than 130 per meter, the elastic polyester filament A and polyester filament B will split significantly, easily forming transverse breaks in the fabric, leading to a decrease in quality. To obtain a better color blending effect, the preferred number of network points is 150–210 per meter.

[0024] In order to ensure that the opening length of the blended fiber after being subjected to tension is moderate and the coefficient of variation of the opening length is small, and the resulting fabric has a better color mixing effect, the average length between adjacent network points in the blended fiber of the present invention is preferably 1 to 7 mm, more preferably 3 to 5 mm; the coefficient of variation of the average length between adjacent network points is preferably below 60%, more preferably below 50%.

[0025] Meanwhile, to ensure excellent elasticity in the blended filaments, the elastic polyester filament A is an elastic filament, specifically composed of two different polyesters arranged in parallel composite fibers, such as PET / PBT parallel composite fibers, PPT / PBT parallel composite fibers, etc. The elastic elongation of the blended filaments is preferably 25-40%, and the elastic recovery rate is preferably 85-95%.

[0026] In preparing the elastic blended yarn of the present invention, the false-twisted polyester filament B and the fully drawn elastic polyester filament A are combined by a post-insertion method. Specifically, the pre-oriented yarn B is first fed into the first roller through the same spindle position, heated in the first heating box, and then introduced into the false twister. At the same time, the fully drawn elastic polyester filament A is passed through the zero roller. Then, the yarns coming out of the false twister and the zero roller are fed together into the second roller for doubling, and then sequentially passed through the networker, the second heating box, the third roller, and the fourth roller, and finally wound to obtain the blended yarn.

[0027] The pre-oriented yarn B undergoes a typical false-twisting process via the first roller, first heating box, and false-twisting device to obtain a polyester filament B with a certain degree of elasticity. The fully drawn elastic polyester filament A passes directly through the zero roller and then enters the second roller together with the polyester filament B. It then passes through the networker, second heating box, third roller, and fourth roller again to obtain the finished product.

[0028] Generally, the looser the filament before entering the networker, the lower the filament tension as it passes through the networker, resulting in more network points in the resulting mixed filament; conversely, the tighter the filament before entering the networker, the higher the filament tension as it passes through the networker, resulting in fewer network points in the resulting mixed filament. To obtain mixed filaments with 130–250 network points / m, the overfeed rate of the third roller and the second roller described in this invention is 3.0–6.0% to ensure that the filament is at an appropriate tension before entering the networker.

[0029] This invention does not impose particular limitations on the selection of the network device, but a two-hole network device is preferred. When the polyester filaments A and B are twisted together through the network device, the network device is opened and compressed air is used to allow airflow to ensure that the polyester filaments A and B are twisted together, creating network points. The larger the network compressed air, the more network points there are and the shorter the distance between adjacent network points; the smaller the network compressed air, the fewer network points there are and the longer the distance between adjacent network points. To obtain a suitable number of network points and the distance between adjacent network points, this invention preferably uses a network compressed air of 3.0–5.0 kg / cm² in the network device. 2 .

[0030] The stretch ratio between the zero roller and the second roller of the polyester filament A affects the elastic elongation, elastic recovery, and the length ratio of elastic polyester filament A to polyester filament B in the blended yarn. A smaller stretch ratio between the zero roller and the second roller results in a larger elongation, a smaller recovery, and a smaller length ratio of elastic polyester filament A to polyester filament B in the blended yarn; conversely, a larger stretch ratio results in a smaller elongation, a larger recovery, and a larger length ratio of elastic polyester filament A to polyester filament B. Therefore, to control the elastic elongation, elastic recovery, and the length ratio of elastic polyester filament A to polyester filament B in the blended yarn within a suitable range, so that the fabric made from the blended yarn of this invention has excellent elasticity and a natural color blending style after dyeing, the stretch ratio between the zero roller and the second roller is preferably 1.00 to 1.10.

[0031] This invention does not impose any particular limitation on the stretch ratio between the first roller and the second roller; general requirements for composite production are sufficient. From the perspective of processing stability, the stretch ratio between the first roller and the second roller is preferably 1.50 to 1.80.

[0032] The blended yarn obtained by the above method has a filament length ratio of 1.5 to 2.0 (polyester filament A: polyester filament B), and the number of network points in the blended yarn is in the range of 130 to 250 per meter. Simultaneously, the blended yarn exhibits good fiber opening effect under certain tension, specifically manifested in a moderate fiber opening length and a small coefficient of variation in the fiber opening length; that is, the length between each adjacent unopened network point is relatively uniform after opening, resulting in good color mixing effect after dyeing fabrics made using the blended yarn of this invention.

[0033] The testing method involved in this invention is as follows:

[0034] (1) Fiber length ratio

[0035] In its natural state, the composite elastic blended yarn is cut into 10 strands, each 5cm long, and then separated. The separated filaments A and B are placed on a measuring machine, and their lengths are measured and recorded. The ratio of filament length A to filament length B is obtained.

[0036] (2) Methods for determining elastic elongation and recovery rate:

[0037] Elastic elongation (%) = ((L1-L0) / L0)*100%,

[0038] Elastic recovery rate (%) = ((L1-L2) / (L1-L0))*100%,

[0039] L0: The length of the fiber measured after being treated with hot water at 90 degrees Celsius for 2 minutes under a load of 2 mg / d and then hung to dry for 12 hours is L0.

[0040] L1: After L0 is measured, the initial load at the time of L0 measurement is removed, and after 2 minutes, a constant load of 100 mg / d is applied. The length measured after 30 seconds is L1.

[0041] L2: After L1 measurement, remove the constant load used in L1 measurement, and after 2 minutes, apply an initial load of 2 mg / d. The length measured after 30 seconds is L2.

[0042] (3) Average length and coefficient of variation between adjacent network points

[0043] ① The network measurement instrument ELECTRONIC-TENSIOMETER is used for the needle punch method. 50 points are needled. The pretension (cN) formula is yarn fineness (D) / 5 + yarn fineness (D) / number of yarns (F). The traveling speed is 0.72m / min. The needle travels from the starting position of the network point to the next network node, which is the length between one network point. The equipment automatically calculates the length between network points. The length between network points is calculated for a total of 50 needle punches. The average length between 50 adjacent network points is calculated and measured. This value is the average length between adjacent network points of the yarn.

[0044] ② Method for calculating the coefficient of variation of the length between adjacent network points:

[0045] Standard deviation of the length between adjacent network points / Average of 50 data points representing the length between adjacent network points * 100%

[0046] (4) Network points

[0047] Number of network points = 1000 mm / average of 50 data points between adjacent network points (mm).

[0048] (5) Network fiber opening length and coefficient of variation

[0049] ① The fiber opening length is measured using the ELECTRONIC-TENSIOMETER network measuring instrument and the needle punch method. 50 points are needled, with a pretension of 25.0 cN and a traveling speed of 0.72 m / min. The needle travels from the starting position of the network point to the next network node, which is one fiber opening length. The equipment automatically calculates the fiber opening length. The fiber opening length is calculated from 50 needle punches. The average value of the 50 fiber opening lengths is the fiber opening length of the yarn.

[0050] ② Method for calculating the coefficient of variation of fiber opening length:

[0051] Standard deviation of fiber opening length / average of 50 fiber opening length data * 100%.

[0052] (6) Color mixing effect after fabric dyeing

[0053] Elastic blended fibers are woven into a fabric, dyed with two dyes, and the fabric surface is observed. Uneven dyeing and obvious mixing of light and dark dyes indicate a color difference effect, while uniform dyeing and complete coverage indicate no color difference effect. Ten experienced individuals in this field judge the appearance of the fabric. If 6-9 individuals believe that the stripes or spots are obvious and the natural color mixing is poor, it is judged as Grade 1; if 6-9 individuals believe that the stripes or spots are slight and the natural color mixing is good, it is judged as Grade 2; and if 6-9 individuals believe that the natural color mixing is excellent (uniform), it is judged as Grade 3.

[0054] The present invention will be described in more detail below with reference to the embodiments, but the embodiments are not intended to limit the present invention.

[0055] Example 1

[0056] Polyester filament B with a monofilament fineness of 2.3 dtex is fed into the first roller, passes through the first heating box (temperature set at 170℃), and then sequentially enters the false twister. It then enters the second roller and is stretched and false twisted at a processing speed of 500 m / min. Next, polyester filament A with a monofilament fineness of 1.5 dtex is fed directly from the same spindle through the zero roller into the second roller to be combined with polyester filament B. After being filamented together, it passes through a two-hole rotary mesher into the third roller. The elongation ratio between the zero roller and the second roller is 1.01, and the mesher operates at a pressure of 4.5 kg / cm². 2 The overfeed rate between the second and third rollers is 5.0%. The resulting composite false-twist yarn contains polyester filament A, a composite parallel fully drawn elastic yarn of low-viscosity PET and PBT, and polyester filament B, a cationic dyeable false-twist yarn. The length ratio of polyester filament A to polyester filament B is 1.7. After heat treatment, the elastic elongation of the mixed-color false-twist yarn is 32%, the elastic elongation recovery rate is 91%, the network point count is 185 / m, the average length between adjacent network points is 3mm, the coefficient of variation of adjacent network point length is 50%, the average fiber opening length after pre-tension adjustment is 7mm, and the coefficient of variation of fiber opening length is below 53%. Fabrics made from this elastic blended yarn exhibit excellent color blending and good elastic recovery after dyeing.

[0057] Example 2

[0058] Polyester filament B with a monofilament fineness of 2.3 dtex is fed into the first roller, passes through the first heating box (temperature set at 170℃), and then sequentially enters the false twister. It then enters the second roller and is stretched and false twisted at a processing speed of 500 m / min. Next, polyester filament A with a monofilament fineness of 1.5 dtex is fed directly from the same spindle through the zero roller into the second roller to be combined with polyester filament B. After being filamented together, it passes through a two-hole rotary mesher into the third roller. The elongation ratio between the zero roller and the second roller is 1.00, and the mesher operates at a pressure of 4.5 kg / cm². 2The overfeed rate between the second and third rollers is 5.0%. The resulting composite false-twist yarn contains polyester filament A, a composite parallel fully drawn yarn of low-viscosity PET and PBT, and polyester filament B, a cationic dyeable false-twist yarn. The length ratio of polyester filament A to polyester filament B is 1.5. After heat treatment, the elastic elongation of the mixed-color false-twist yarn is 40%, the elastic elongation recovery rate is 85%, the network point count is 185 / m, the average length between adjacent network points is 3mm, the coefficient of variation of adjacent network point length is 50%, the average fiber opening length after pre-tension adjustment is 7mm, and the coefficient of variation of fiber opening length is below 53%. Fabrics made from this elastic blended yarn exhibit slight pitting after dyeing, good color blending, and excellent elastic recovery.

[0059] Example 3

[0060] Polyester filament B with a monofilament fineness of 2.3 dtex is fed into the first roller, passes through the first heating box (temperature set at 170℃), and then sequentially enters the false twister. It then enters the second roller and is stretched and false twisted at a processing speed of 500 m / min. Next, polyester filament A with a monofilament fineness of 1.5 dtex is fed directly from the same spindle through the zero roller into the second roller to be combined with polyester filament B. After being filamented together, it passes through a two-hole rotary mesher into the third roller. The elongation ratio between the zero roller and the second roller is 1.10, and the mesher operates at a pressure of 4.5 kg / cm². 2 The overfeed rate between the second and third rollers is 5.0%. The resulting composite false-twist yarn contains polyester filament A, a composite parallel fully drawn yarn of low-viscosity PET and PBT, and polyester filament B, a cationic dyeable false-twist yarn. The length ratio of polyester filament A to polyester filament B is 2.0. After heat treatment, the elastic elongation of the mixed-color false-twist yarn is 25%, the elastic elongation recovery rate is 95%, the network point count is 185 / m, the average length between adjacent network points is 3mm, the coefficient of variation of adjacent network point length is 50%, the average fiber opening length after pre-tension adjustment is 7mm, and the coefficient of variation of fiber opening length is below 53%. Fabrics made from this elastic blended yarn exhibit slight stripes after dyeing, good color blending, and excellent elastic recovery.

[0061] Example 4

[0062] Polyester filament B with a monofilament fineness of 2.3 dtex is fed into the first roller, passes through the first heating box (temperature set at 170℃), and then sequentially enters the false twister. It then enters the second roller and is stretched and false twisted at a processing speed of 500 m / min. Next, polyester filament A with a monofilament fineness of 1.5 dtex is fed directly into the second roller from the same spindle via the zero roller to be combined with polyester filament B. After being filamented together, it passes through a two-hole rotary mesher into the third roller. The elongation ratio between the zero roller and the second roller is 1.04, and the mesher operates at a pressure of 4.5 kg / cm². 2 The overfeed rate between the second and third rollers was 5.0%. The resulting composite false-twist yarn contained polyester filament A, a composite parallel fully drawn yarn of low-viscosity PET and PBT, and polyester filament B, a cationic dyeable false-twist yarn. The length ratio of polyester filament A to polyester filament B was 1.6. After heat treatment, the mixed-color false-twist yarn exhibited an elastic elongation of 35%, an elastic elongation recovery rate of 89%, a network point count of 185 / m, an average length between adjacent network points of 3mm, a coefficient of variation of adjacent network point lengths of 50%, and an average fiber opening length of 7mm after pre-tension adjustment, with a coefficient of variation of fiber opening length below 53%. Fabrics made from this elastic blended yarn, after dyeing, exhibited very weak stripes, a color blending effect between good and excellent, and good elastic recovery.

[0063] Example 5

[0064] Polyester filament B with a monofilament fineness of 2.3 dtex is fed into the first roller, passes through the first heating box (temperature set at 170℃), and then sequentially enters the false twister. It then enters the second roller and is stretched and false twisted at a processing speed of 500 m / min. Next, polyester filament A with a monofilament fineness of 1.5 dtex is fed directly into the second roller from the same spindle via the zero roller to be combined with polyester filament B. After being filamented together, it passes through a two-hole rotary mesher into the third roller. The elongation ratio between the zero roller and the second roller is 1.07, and the mesher operates at a pressure of 4.5 kg / cm². 2 The overfeed rate between the second and third rollers was 5.0%. The resulting composite false-twist yarn contained polyester filament A, a composite parallel fully drawn yarn of low-viscosity PET and PBT, and polyester filament B, a cationic dyeable false-twist yarn. The length ratio of polyester filament A to polyester filament B was 1.9. After heat treatment, the elastic elongation of the mixed-color false-twist yarn was 30%, the elastic elongation recovery rate was 93%, the network point count was 185 / m, the average length between adjacent network points was 3mm, the coefficient of variation of adjacent network point length was 50%, and the average fiber opening length after pre-tension adjustment was 7mm, with a coefficient of variation of fiber opening length below 53%. Fabrics made from this elastic mixed-color yarn, after dyeing, exhibited very weak stripes, with a color blending effect between good and excellent, and good elastic recovery.

[0065] Example 6

[0066] Polyester filament B with a monofilament fineness of 2.3 dtex is fed into the first roller, passes through the first heating box (temperature set at 170℃), and then sequentially enters the false twister. It then enters the second roller and is stretched and false twisted at a processing speed of 500 m / min. Next, polyester filament A with a monofilament fineness of 1.5 dtex is fed directly into the second roller from the same spindle via the zero roller to be combined with polyester filament B. After being filamented together, it passes through a two-hole rotary mesher into the third roller. The elongation ratio between the zero roller and the second roller is 1.01, and the mesher operates at a pressure of 4.5 kg / cm². 2 The overfeed rate between the second and third rollers is 3.0%. The resulting composite false-twist yarn contains polyester filament A, a composite parallel fully drawn yarn of low-viscosity PET and PBT, and polyester filament B, a cationic dyeable false-twist yarn. The length ratio of polyester filament A to polyester filament B is 1.7. After heat treatment, the elastic elongation of the mixed-color false-twist yarn is 32%, the elastic elongation recovery rate is 91%, the network point count is 130 / m, the average length between adjacent network points is 7mm, the coefficient of variation of adjacent network point length is 60%, and the average fiber opening length after pre-tension adjustment is 12mm, with a coefficient of variation of fiber opening length below 65%. Fabrics made from this elastic blended yarn exhibit slight stripes after dyeing, good color blending, and excellent elastic recovery.

[0067] Example 7

[0068] Polyester filament B with a monofilament fineness of 2.3 dtex is fed into the first roller, passes through the first heating box (temperature set at 170℃), and then sequentially enters the false twister. It then enters the second roller and is stretched and false twisted at a processing speed of 500 m / min. Next, polyester filament A with a monofilament fineness of 1.5 dtex is fed directly into the second roller from the same spindle via the zero roller to be combined with polyester filament B. After being filamented together, it passes through a two-hole rotary mesher into the third roller. The elongation ratio between the zero roller and the second roller is 1.01, and the mesher operates at a pressure of 4.5 kg / cm². 2 The overfeed rate between the second and third rollers is 3.5%. The resulting composite false-twist yarn contains polyester filament A, a composite parallel fully drawn yarn of low-viscosity PET and PBT, and polyester filament B, a cationic dyeable false-twist yarn. The length ratio of polyester filament A to polyester filament B is 1.7. After heat treatment, the elastic elongation of the mixed-color false-twist yarn is 32%, the elastic elongation recovery rate is 91%, the network point count is 150 / m, the average length between adjacent network points is 5mm, the coefficient of variation of adjacent network point length is 55%, and the average fiber opening length after pre-tension adjustment is 10mm, with a coefficient of variation of fiber opening length below 55%. Fabrics made from this elastic blended yarn exhibit very weak stripes after dyeing, with a color blending effect between good and excellent, and good elastic recovery.

[0069] Example 8

[0070] Polyester filament B with a monofilament fineness of 2.3 dtex is fed into the first roller, passes through the first heating box (temperature set at 170℃), and then sequentially enters the false twister. It then enters the second roller and is stretched and false twisted at a processing speed of 500 m / min. Next, polyester filament A with a monofilament fineness of 1.5 dtex is fed directly into the second roller from the same spindle via the zero roller to be combined with polyester filament B. After being filamented together, it passes through a two-hole rotary mesher into the third roller. The elongation ratio between the zero roller and the second roller is 1.01, and the mesher operates at a pressure of 4.5 kg / cm². 2 The overfeed rate between the second and third rollers was 6.0%. The resulting composite false-twist yarn contained polyester filament A, a composite parallel fully drawn yarn of low-viscosity PET and PBT, and polyester filament B, a cationic dyeable false-twist yarn. The length ratio of polyester filament A to polyester filament B was 1.7. After heat treatment, the elastic elongation of the mixed-color false-twist yarn was 32%, the elastic elongation recovery rate was 91%, the network point count was 250 / m, the average length between adjacent network points was 2mm, the coefficient of variation of adjacent network point length was 45%, and the average fiber opening length after pre-tension adjustment was 5mm, with a coefficient of variation of fiber opening length below 42%. Fabrics made from this elastic blended yarn, after dyeing, exhibited slight pitting, good color blending, and excellent elastic recovery.

[0071] Example 9

[0072] Polyester filament B with a monofilament fineness of 2.3 dtex is fed into the first roller, passes through the first heating box (temperature set at 170℃), and then sequentially enters the false twister. It then enters the second roller and is stretched and false twisted at a processing speed of 500 m / min. Next, polyester filament A with a monofilament fineness of 1.5 dtex is fed directly into the second roller from the same spindle via the zero roller to be combined with polyester filament B. After being filamented together, it passes through a two-hole rotary mesher into the third roller. The elongation ratio between the zero roller and the second roller is 1.01, and the mesher operates at a pressure of 3.0 kg / cm². 2The overfeed rate between the second and third rollers was 5.0%. The resulting composite false-twist yarn contained polyester filament A, a composite parallel fully drawn yarn of low-viscosity PET and PBT, and polyester filament B, a cationic dyeable false-twist yarn. The length ratio of polyester filament A to polyester filament B was 1.7. After heat treatment, the elastic elongation of the mixed-color false-twist yarn was 32%, the elastic elongation recovery rate was 91%, the network point count was 130 / m, the average length between adjacent network points was 7mm, the coefficient of variation of adjacent network point lengths was 60%, and the average fiber opening length after pre-tension adjustment was 12mm, with a coefficient of variation of fiber opening length below 65%. Fabrics made from this elastic blended yarn, after dyeing, exhibited slight stripes, good color blending, and excellent elastic recovery.

[0073] Example 10

[0074] Polyester filament B with a monofilament fineness of 2.3 dtex is fed into the first roller, passes through the first heating box (temperature set at 170℃), and then sequentially enters the false twister. It then enters the second roller and is stretched and false twisted at a processing speed of 500 m / min. Next, polyester filament A with a monofilament fineness of 1.5 dtex is fed directly into the second roller from the same spindle via the zero roller to be combined with polyester filament B. After being filamented together, it passes through a two-hole rotary mesher into the third roller. The elongation ratio between the zero roller and the second roller is 1.01, and the mesher operates at a pressure of 5.0 kg / cm². 2 The overfeed rate between the second and third rollers was 5.0%. The resulting composite false-twist yarn contained polyester filament A, a composite untwisted yarn of low-viscosity PET and PBT, and polyester filament B, a cationic dyeable false-twist yarn. The length ratio of polyester filament A to polyester filament B was 1.7. After heat treatment, the mixed-color false-twist yarn exhibited an elastic elongation of 32%, an elastic elongation recovery rate of 91%, a network point count of 250 / m, an average length between adjacent network points of 2mm, a coefficient of variation of 45% for the length of adjacent network points, and an average fiber opening length of 5mm after pre-tension adjustment, with a coefficient of variation of less than 42%. Fabrics made from this elastic blended yarn, after dyeing, showed slight pitting, good color blending, and excellent elastic recovery.

[0075] Example 11

[0076] A cationic dyeable polyester filament B with a monofilament fineness of 2.3 dtex is fed into the first roller, passes through the first heating box (temperature set at 170℃), and is then sequentially introduced into the false twister. It then enters the second roller and is stretched and false twisted at a processing speed of 500 m / min. Next, a polyester filament A with a monofilament fineness of 1.5 dtex is fed directly into the second roller from the same spindle via the zero roller to be combined with polyester filament B. After being filamented together, it passes through a two-hole rotary mesher into the third roller. The elongation ratio between the zero roller and the second roller is 0.995, and the mesher operates at a pressure of 4.5 kg / cm². 2 The overfeed rate between the second and third rollers was 5.0%. The resulting composite false-twist processed yarn contained polyester filament A, a composite parallel fully drawn yarn of low-viscosity PET and PBT, and polyester filament B, a false-twist processed yarn. The length ratio of polyester filament A to polyester filament B was 1.2. The elongation of the processed yarn was 40%, the elastic elongation recovery rate was 85%, the network point count was 185 / m, the average length between adjacent network points was 3mm, the coefficient of variation of adjacent network point lengths was 50%, and the average fiber opening length after pre-tension adjustment was 7mm, with a coefficient of variation of fiber opening length below 53%. Fabrics made from this elastic blended yarn exhibited excellent color blending and superior elastic recovery after dyeing.

[0077] Example 12

[0078] Polyester filament B with a monofilament fineness of 2.3 dtex is fed into the first roller, passes through the first heating box (temperature set at 170℃), and then sequentially enters the false twister. It then enters the second roller and is stretched and false twisted at a processing speed of 500 m / min. Next, polyester filament A with a monofilament fineness of 1.5 dtex is fed directly into the second roller from the same spindle via the zero roller to be combined with polyester filament B. After being filamented together, it passes through a two-hole rotary mesher into the third roller. The elongation ratio between the zero roller and the second roller is 1.15, and the mesher operates at a pressure of 4.5 kg / cm². 2 The overfeed rate between the second and third rollers was 5.0%. The resulting composite false-twist yarn contained polyester filament A, a composite parallel fully drawn yarn of low-viscosity PET and PBT, and polyester filament B, a cationic dyeable false-twist yarn. The length ratio of polyester filament A to polyester filament B was 2.2. After heat treatment, the mixed-color false-twist yarn exhibited an elastic elongation of 20%, an elastic elongation recovery rate of 96%, a network point count of 185 / m, an average length between adjacent network points of 3mm, a coefficient of variation of adjacent network point lengths of 50%, and an average fiber opening length of 7mm after pre-tension adjustment, with a coefficient of variation of fiber opening length below 53%. Fabrics made from this elastic blended yarn, after dyeing, showed excellent color blending and good elastic recovery.

[0079] Example 13

[0080] Polyester filament B with a monofilament fineness of 2.3 dtex is fed into the first roller, passes through the first heating box (temperature set at 170℃), and then sequentially enters the false twister. It then enters the second roller and is stretched and false twisted at a processing speed of 500 m / min. Next, polyester filament A with a monofilament fineness of 1.5 dtex is fed directly into the second roller from the same spindle via the zero roller to be combined with polyester filament B. After being filamented together, it passes through a two-hole rotary mesher into the third roller. The elongation ratio between the zero roller and the second roller is 1.01, and the mesher operates at a pressure of 2.5 kg / cm². 2 The overfeed rate between the second and third rollers was 5.0%. The resulting composite false-twist yarn contained polyester filament A, a composite parallel fully drawn yarn of low-viscosity PET and PBT, and polyester filament B, a cationic dyeable false-twist yarn. The length ratio of polyester filament A to polyester filament B was 1.7. After heat treatment, the elastic elongation of the mixed-color false-twist yarn was 32%, the elastic elongation recovery rate was 91%, the network point count was 130 / m, the average length between adjacent network points was 7mm, the coefficient of variation of adjacent network point lengths was 60%, and the average fiber opening length after pre-tension adjustment was 12mm, with a coefficient of variation of fiber opening length below 65%. Fabrics made from this elastic blended yarn, after dyeing, exhibited slight stripes, good color blending, and excellent elastic recovery.

[0081] Comparative Example 1

[0082] Polyester filament B with a monofilament fineness of 2.3 dtex is fed into the first roller, passes through the first heating box (temperature set at 170℃), and then sequentially enters the false twister. It then enters the second roller and is stretched and false twisted at a processing speed of 500 m / min. Next, polyester filament A with a monofilament fineness of 1.5 dtex is fed directly into the second roller from the same spindle via the zero roller to be combined with polyester filament B. After being filamented together, it passes through a two-hole rotary mesher into the third roller. The elongation ratio between the zero roller and the second roller is 1.01, and the mesher operates at a pressure of 4.5 kg / cm². 2 The overfeed rate between the second and third rollers was 5.0%. The resulting composite false-twist processed yarn contained polyester filament A, a fully drawn, matte polyethylene terephthalate yarn, and polyester filament B, a cationic dyeable false-twist processed yarn. The length ratio of polyester filament A to polyester filament B was 1.7. The elongation of the processed yarn was 10%, the elastic elongation recovery rate was 91%, the network point count was 185 / m, the average length between adjacent network points was 3mm, the coefficient of variation of adjacent network point lengths was 50%, and the average fiber opening length after pre-tension adjustment was 7mm, with a coefficient of variation of fiber opening length below 53%. Fabrics made from this elastic blended yarn exhibited obvious stripes, poor color mixing, and no elastic recovery effect after dyeing.

[0083] Comparative Example 2

[0084] Polyester filament B with a monofilament fineness of 2.3 dtex is fed into the first roller, passes through the first heating box (temperature set at 170℃), and then sequentially enters the false twister. It then enters the second roller and is stretched and false twisted at a processing speed of 500 m / min. Next, polyester filament A with a monofilament fineness of 1.5 dtex is fed directly into the second roller from the same spindle via the zero roller to be combined with polyester filament B. After being filamented together, it passes through a two-hole rotary mesher into the third roller. The elongation ratio between the zero roller and the second roller is 1.01, and the mesher operates at a pressure of 4.5 kg / cm². 2 The overfeed rate between the second and third rollers is 2.5%. The resulting composite false-twist yarn contains polyester filament A, a composite parallel fully drawn yarn of low-viscosity PET and PBT, and polyester filament B, a cationic dyeable false-twist yarn. The length ratio of polyester filament A to polyester filament B is 1.7. After heat treatment, the elastic elongation of the mixed-color false-twist yarn is 32%, the elastic elongation recovery rate is 91%, the network point count is 110 / m, the average length between adjacent network points is 8mm, the coefficient of variation of adjacent network point length is 92%, and the average fiber opening length after pre-tension adjustment is 15mm, with a coefficient of variation of fiber opening length below 93%. Fabrics made from this elastic blended yarn, after dyeing, exhibit obvious stripes, poor natural color blending, and good elastic recovery.

[0085] Comparative Example 3

[0086] Polyester filament B with a monofilament fineness of 2.3 dtex is fed into the first roller, passes through the first heating box (temperature set at 170℃), and then sequentially enters the false twister. It then enters the second roller and is stretched and false twisted at a processing speed of 500 m / min. Next, polyester filament A with a monofilament fineness of 1.5 dtex is fed directly into the second roller from the same spindle via the zero roller to be combined with polyester filament B. After being filamented together, it passes through a two-hole rotary mesher into the third roller. The elongation ratio between the zero roller and the second roller is 1.01, and the mesher operates at a pressure of 4.5 kg / cm². 2 The overfeed rate between the second and third rollers is 6.5%. The resulting composite false-twist yarn contains polyester filament A, a composite parallel fully drawn yarn of low-viscosity PET and PBT, and polyester filament B, a cationic dyeable false-twist yarn. The length ratio of polyester filament A to polyester filament B is 1.7. After heat treatment, the elastic elongation of the mixed-color false-twist yarn is 32%, the elastic elongation recovery rate is 91%, the network point count is 350 / m, the average length between adjacent network points is 1mm, the coefficient of variation of adjacent network point length is 30%, and the average fiber opening length after pre-tension adjustment is 2mm, with a coefficient of variation of fiber opening length below 35%. Fabrics made from this elastic blended yarn exhibit noticeable pitting after dyeing, poor color mixing, and good elastic recovery.

[0087] Comparative Example 4

[0088] Polyester filament B with a monofilament fineness of 2.3 dtex is fed into the first roller, passes through the first heating box (temperature set at 170℃), and then sequentially enters the false twister. It then enters the second roller and is stretched and false twisted at a processing speed of 500 m / min. Next, polyester filament A with a monofilament fineness of 1.5 dtex is fed directly into the second roller from the same spindle via the zero roller to be combined with polyester filament B. After being filamented together, it passes through a single-hole rotary mesher into the third roller. The elongation ratio between the zero roller and the second roller is 1.01, and the mesher operates at a pressure of 4.5 kg / cm². 2 The overfeed rate between the second and third rollers was 5.0%. The resulting composite false-twist yarn contained polyester filament A, a composite parallel fully drawn yarn of low-viscosity PET and PBT, and polyester filament B, a cationic dyeable false-twist yarn. The length ratio of polyester filament A to polyester filament B was 1.7. After heat treatment, the elastic elongation of the mixed-color false-twist yarn was 32%, the elastic elongation recovery rate was 91%, the network point count was 350 / m, the average length between adjacent network points was 1 mm, the coefficient of variation of adjacent network point lengths was 30%, and the average fiber opening length after pre-tension adjustment was 2 mm, with a coefficient of variation of fiber opening length below 35%. Fabrics made from this elastic blended yarn exhibited noticeable pitting after dyeing, poor color blending, and good elastic recovery.

[0089]

[0090]

Claims

1. Elastic blended fiber, characterized by: The blended fiber is composed of fully drawn elastic polyester filament A and false-twist polyester filament B with different dyeing properties. The ratio of the length of elastic polyester filament A to polyester filament B in the natural winding state is 1.5 to 2.

0. The number of network points in the blended fiber is 130 to 250 per meter. The average opening length of the blended fiber under a tension of 25 cN is 5 to 12 mm, and the coefficient of variation of the opening length is below 65%. The average length between adjacent network points is 1 to 7 mm, and the coefficient of variation of the length between adjacent network points is below 60%.

2. The elastic blended fiber according to claim 1, characterized in that: The elastic elongation of the elastic blended fiber is 25-40%, and the elastic recovery rate is 85-95%.

3. The elastic blended fiber according to claim 1, characterized in that: The polyester filament B is a cationic dyeable polyester filament.

4. The elastic blended fiber according to claim 1, characterized in that: The number of network points is 150 to 210 per m, the average fiber opening length is 7 to 9 mm, and the coefficient of variation of the fiber opening length is below 55%.

5. The elastic blended fiber according to claim 1, characterized in that: The average length between adjacent network points is 3 to 5 mm, and the coefficient of variation of the length between adjacent network points is less than 50%.

6. The method for preparing the elastic blended fiber according to claim 1, characterized in that: The pre-oriented yarn B is fed into the first roller through the same spindle position, heated in the first heating box, and then introduced into the false twister. It is then fed into the second roller together with the fully drawn elastic polyester filament A that has passed through the zero roller for doubling. It then passes through the networker, the second heating box, the third roller, and the fourth roller in sequence, and finally the mixed fiber is wound. The overfeed rate of the third roller and the second roller is 3.0 to 6.0%.

7. The method for preparing the elastic blended fiber according to claim 6, characterized in that: The compressed air in the network device is 3.0–5.0 kg / cm³. 2 .

8. The method for preparing the elastic blended fiber according to claim 6, characterized in that: The stretch ratio between the zero roller and the second roller is 1.00 to 1.

10.

9. The application of the elastic blended yarn of claim 1 in fabrics.

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