An elastic differential - shrinkage and differential - color imitation cotton yarn, fabric and its preparation method

Abstract

The present invention belongs to the technical field of imitation cotton yarn, and discloses an elastic differential shrinkage and differential color imitation cotton yarn, a fabric and a preparation method thereof. The elastic differential shrinkage and differential color imitation cotton yarn of the present invention comprises three kinds of yarns, namely, two-component polyester POY, cationic polyester POY and high-shrinkage polyester FDY, which greatly reduces the preparation cost. The added two-component polyester POY in the present invention enables the prepared elastic differential shrinkage and differential color imitation cotton yarn to have certain elasticity and a crimp shrinkage rate of more than 30%, thereby enabling the finished fabric to have a certain elongation recovery rate. The present invention feeds the above three raw materials into a specific nozzle through a texturing and composite manner, and under the action of a certain air pressure, an elastic differential shrinkage and differential color imitation cotton yarn with a larger shrinkage rate after dyeing is formed, so that a finished fabric with a high density of warp yarns can be obtained after post-processing and finishing even with a relatively low warp density of the grey fabric. At the same time, the yarn network points will be relatively stable, and the breaking strength of the yarn will increase to a certain extent, thereby increasing the tearing strength of the finished fabric.

Description

Technical Field

[0001] The present invention belongs to the technical field of imitation cotton yarns, and particularly relates to an elastic differential shrinkage and differential color imitation cotton yarn, a fabric and a preparation method thereof. Background Art

[0002] Imitation cotton yarns are similar in texture to natural cotton yarns and have low costs, so they are deeply favored by the market. However, the existing imitation cotton fabrics still have a gap with cotton in terms of hand feeling, and at the same time, the elasticity is relatively insufficient. Existing imitation cotton yarns are generally spun from polyester staple fibers, such as DuPont polyester staple fibers. However, in order to pursue a good hand feeling, the yarns spun from DuPont staple fibers have long hairiness, so the fabric is prone to pilling, seriously affecting the service life and aesthetics of the product; the yarns spun from texturized polyester staple fibers overcome the defect of pilling, but the hand feeling is hard, the advantage of imitating cotton is not obvious, and the fabric is prone to creases during dyeing; high-grade imitation cotton yarns, such as DuPont imitation cotton yarns, also have the disadvantages of relatively high prices and a small popularization area. Summary of the Invention

[0003] In view of this, the purpose of the present invention is to provide an elastic differential shrinkage and differential color imitation cotton yarn, a fabric and a preparation method thereof. The imitation cotton yarn obtained by this preparation method has good elasticity, a good cotton feeling and good shrinkage.

[0004] The present invention provides a preparation method of an elastic differential shrinkage and differential color imitation cotton yarn, comprising the following steps:

[0005] S1. After the first raw material yarn passes through the first roller, it is drawn at a first draft ratio through a hot needle, and then is sent to the second roller together with the second raw material yarn respectively;

[0006] S2. The first raw material yarn and the second raw material yarn are compounded through a first nozzle and then pass through the third roller, and then are drawn at a second draft ratio through a first hot box, and then are subjected to texturing treatment through a disk false twister to obtain a composite yarn;

[0007] S3. The composite yarn passes through a reference roller and is compounded with a third raw material yarn through a second nozzle, and then sequentially passes through an auxiliary roller, a second hot box for shaping treatment and a fourth roller, and finally is wound and formed to obtain the elastic differential shrinkage and differential color imitation cotton yarn;

[0008] The first raw material yarn is a PBT / PET bicomponent polyester POY, the second raw material yarn is a polyester cationic POY, and the third raw material yarn is a high shrinkage polyester FDY.

[0009] Furthermore, the fineness of the PBT / PET bicomponent polyester POY is 44 - 330 dtex, and the U value is 0.3 - 1.2; the fineness of the polyester cationic POY is 44 - 330 dtex; the fineness of the high shrinkage polyester FDY is 33 - 111 dtex. The U value represents the evenness of yarn evenness.

[0010] Furthermore, the first draft ratio is 1.5 - 1.7, and the temperature at the hot needle is 70 - 100 °C.

[0011] Furthermore, the second draft ratio is 1.02 - 1.18, and the temperature at the first hot box is 160 - 200 °C.

[0012] Furthermore, the speed of the first roller is 200 - 350 m / min, the speed of the second roller is 315 - 560 m / min, the speed of the third roller is 300 - 550 m / min; the speed of the reference roller is 350 - 700 m / min.

[0013] Furthermore, after the first raw material yarn and the second raw material yarn are compounded through the first nozzle, they are curled. The first nozzle is sequentially provided with a first through hole, a second through hole, and a third through hole that communicate with each other along the yarn movement direction. The first through hole, the second through hole, and the third through hole form a through portion for the yarn to move through the first nozzle. The first through hole is a supply portion for the yarn to enter, the second through hole is an interlacing portion for the yarn to be compounded and curled, the third through hole is a discharge portion for discharging the compounded yarn. A plurality of air flow through holes communicating with the second through hole are provided on the outer peripheral wall of the first nozzle corresponding to the second through hole. The air flow through holes supply air flow for curling the compounded yarn, and the flow path of the air flow intersects with the second through hole at an acute angle.

[0014] Furthermore, the D / Y ratio of the disk false twister is 1.5 - 1.8, the speed of the disk false twister is 350 - 550 m / min, the speed of the auxiliary roller is 340 - 685 m / min, and the speed of the fourth roller is 320 - 680 m / min.

[0015] The present invention also provides an elastic differential shrinkage and differential color imitation cotton yarn prepared by the above preparation method.

[0016] Furthermore, in the elastic differential shrinkage and differential color imitation cotton yarn, the content of the PBT / PET bicomponent polyester POY accounts for more than 30% of the total weight of the elastic differential shrinkage and differential color imitation cotton yarn.

[0017] The present invention also provides an elastic differential - shrinkage and differential - color cotton - like fabric. The elastic differential - shrinkage and differential - color cotton - like fabric is formed by the interweaving of warp yarns and weft yarns. The warp yarns are PBT / PET bicomponent polyester DTY, and the weft yarns are the elastic differential - shrinkage and differential - color cotton - like yarns prepared by the above - mentioned preparation method or the above - mentioned elastic differential - shrinkage and differential - color cotton - like yarns. The warp density of the elastic differential - shrinkage and differential - color cotton - like fabric is 150 - 160 picks per inch, the weft density is 110 - 120 picks per inch, and the fabric texture is 2 / 2 twill. The fabric (gray fabric) formed by warp - weft interweaving is woven under specific weaving conditions: a water - jet cam loom with the back - rotation speed control range of 480 - 600 rpm. Then, through gray - fabric refining, intermediate setting, dyeing, drying resin treatment, and final setting, the fabric is obtained.

[0018] The polyester cationic composite fabric can develop a color - woven - like effect with distinct stripes through dyeing and processing, and can also achieve a multi - level color tone with a hazy two - color or multi - color effect. Among them, the polyester fibers are dyed with disperse dyes, and the cation - modified polyester fibers are dyed with cationic dyes. By varying the ratio of disperse dyes and cationic dyes, a double - dyeing and differential - color effect of polyester and cation can be achieved.

[0019] Compared with the prior art, the present invention has the following technical effects:

[0020] An elastic differential - shrinkage and differential - color cotton - like yarn of the present invention includes bicomponent polyester POY, polyester cationic POY, and high - shrinkage polyester FDY, which greatly reduces the preparation cost. On the basis of polyester cationic POY and high - shrinkage polyester FDY, bicomponent polyester POY is also added, making the prepared elastic differential - shrinkage and differential - color cotton - like yarn have good elasticity (the crimp shrinkage rate is above 30%), good cotton feel, and high shrinkage, and further enabling the finished fabric to have a certain elongation recovery rate.

[0021] A preparation method of an elastic differential - shrinkage and differential - color cotton - like yarn of the present invention is to feed bicomponent polyester POY, polyester cationic POY, and high - shrinkage polyester FDY into a specific nozzle through the texturing and compounding methods mentioned in the above - mentioned scheme to form an elastic differential - shrinkage and differential - color cotton - like yarn. The dyed shrinkage rate of the cotton - like yarn of the present invention is larger. When applied to fabrics, such as fabrics, it enables a lower warp density of the gray fabric to obtain a high - density warp - yarn finished fabric after post - processing and finishing. At the same time, the yarn network points are relatively stable. On the one hand, the breaking strength of the yarn increases to a certain extent, thereby increasing the tearing strength of the fabric. On the other hand, the application of this yarn to the fabric can reduce the occurrence of cross - entanglement spots on the fabric surface. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a flow chart of the preparation method of the elastic differential - shrinkage and differential - color cotton - like yarn of the invention.

[0023] Figure 2 It is a schematic structural diagram of the first nozzle in the present invention;

[0024] 1 - First raw material yarn; 2 - Second raw material yarn; 3 - Third raw material yarn; 4 - First cutter; 5 - Second cutter; 6 - Third cutter; 7 - First roller; 8 - Hot needle; 9 - Second roller; 10 - First nozzle; 101 - First through hole; 102 - Second through hole; 103 - Third through hole; 104 - Air flow through hole; 11 - Third roller; 12 - First hot box; 13 - Disc false twister; 14 - Reference roller; 15 - Second nozzle; 16 - Auxiliary roller; 17 - Second hot box; 18 - Fourth roller; 19 - Elastic differential shrinkage and differential color imitation cotton yarn. Detailed implementation manners

[0025] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0026] The first raw material yarn 1 adopted in the present invention is PBT / PET bicomponent polyester POY, and the preparation method is as follows: PET chips and PBT chips are respectively crystallized and dried, and the dried PET chips and PBT chips are respectively melted by a screw extruder to obtain a PET spinning melt and a PBT spinning melt. Then, bicomponent composite spinning is carried out by using a bicomponent composite spinning box, and after side blowing cooling, oiling, drawing, and winding, PBT / PET bicomponent polyester POY is obtained.

[0027] Example 1

[0028] The selected raw materials are: the first raw material yarn 136T - 48 - PBTPET.POY; the second raw material yarn 110T - 72 - CD.POY; the third raw material yarn 66T - 24 - high shrinkage.FDY.

[0029] A preparation method of an elastic differential shrinkage and differential color imitation cotton yarn of the present invention includes the following steps:

[0030] Step 1, after the first raw material yarn 1 is led out from the creel and passes through the first cutter 4, the first raw material yarn 1 passes through the first roller 7, and is drawn at a draw ratio of 1.6 through the hot needle 8. The temperature at the hot needle 8 is 85 °C, and the speed of the first roller (7) is 265 m / min;

[0031] Step 2: After the first raw material yarn 1 passes through the second roller (9), it is combined with the second raw material yarn 2 passing through the second cutter 5 at the first nozzle 10 below the second roller 9 and then passes through the third roller 11. The speed of the second roller 9 is 424 m / min, and the speed of the third roller 11 is 418 m / min. Then, it is drawn at a draft ratio of 1.15 through the first hot box 12, and the temperature at the first hot box 12 is 165 °C. Then, it undergoes texturing treatment through the disk false twister 13. The D / Y ratio of the disk false twister 13 is 1.62, and the speed of the disk false twister 13 is 450 m / min.

[0032] Step 3: Then, the yarn passes through the reference roller 14 and is combined with the third raw material yarn 3 passing through the third cutter 6 at the second nozzle 15, and then passes through the auxiliary roller 16. It is shaped through the second hot box 17 and passes through the fourth roller 18, and finally the elastic differential shrinkage and differential color imitation cotton yarn 19 is formed by winding. Among them, the temperature at the second hot box 17 is 142 °C, the speed of the reference roller 14 is 480.7 m / min, the speed of the auxiliary roller 16 is 472.2 m / min, and the speed of the fourth roller 18 is 465.5 m / min.

[0033] Example 2

[0034] The selected raw materials are: the first raw material yarn 185T - 96 - PBTPET.POY; the second raw material yarn 165T - 72 - CD.POY; the third raw material yarn: 99 T - 36 - high shrinkage.FDY.

[0035] A preparation method of an elastic differential shrinkage and differential color imitation cotton yarn of the present invention includes the following steps:

[0036] Step 1: After the first raw material yarn 1 is led out from the creel and passes through the cutter 4, the first raw material yarn 1 passes through the first roller 7. The speed of the first roller (7) is 200 m / min, and it is drawn at a certain draft ratio through the hot needle 8. The draft ratio is 1.7, and the temperature at the hot needle 8 is 100 °C.

[0037] Step 2: After the first raw material yarn 1 passes through the second roller (9), it is combined with the second raw material yarn 2 at the first nozzle 10 below the second roller 9 and then passes through the third roller 11. The speed of the second roller 9 is 340 m / min, and the speed of the third roller 11 is 335 m / min. Then, it is drawn at a certain draft ratio through the first hot box 12. The draft ratio is 1.1, and the temperature at the first hot box 12 is 170 °C. Then, it undergoes texturing treatment through the disk false twister 13. The D / Y ratio of the disk false twister 13 is 1.6, and the speed of the disk false twister 13 is 589.6 m / min.

[0038] Step 3: Then the yarn passes through the reference roller 14 and is then compounded with the third raw material yarn 3 through the second nozzle 15, and then passes through the auxiliary roller 16, and is shaped through the second hot box 17. The temperature at the second hot box 17 is 165°C. It passes through the fourth roller 18, and finally is wound and formed to obtain the elastic differential shrinkage and differential color imitation cotton yarn 19. Among them, the speed of the reference roller 14 is 368.5 m / min, the speed of the auxiliary roller 16 is 360 m / min, and the speed of the fourth roller 18 is 358 m / min.

[0039] Example 3

[0040] The selected raw materials are: the first raw material yarn 97T - 48 - PBTPET.POY; the second raw material yarn 88T - 72 - CD.POY; the third raw material yarn 33T - 12 - high shrinkage.FDY.

[0041] A preparation method of an elastic differential shrinkage and differential color imitation cotton yarn of the present invention comprises the following steps:

[0042] Step 1: The first raw material yarn 1 is led out from the creel and passes through the cutter 4, and then the first raw material yarn 1 passes through the first roller 7. The speed of the first roller (7) is 330 m / min, and it passes through the hot needle 8 with a certain draft. The draft ratio is 1.67, and the temperature at the hot needle 8 is 85°C.

[0043] Step 2: When the first raw material yarn 1 passes through the second roller (9) and is compounded with the second raw material yarn 2 through the first nozzle 10 below the second roller 9 and then passes through the third roller 11. The speed of the second roller 9 is 551.1 m / min, and the speed of the third roller 11 is 541 m / min. Then, it passes through the first hot box 12 with a certain draft. The draft ratio is 1.12, and the temperature at the first hot box 12 is 165°C. Then it passes through the disk false twister 13 for texturing treatment. The D / Y ratio of the disk false twister 13 is 1.6, and the speed of the disk false twister 13 is 969.4 m / min.

[0044] Step 3: Then the yarn passes through the reference roller 14 and is then compounded with the third raw material yarn 3 through the second nozzle 15, and then passes through the auxiliary roller 16, and is shaped through the second hot box 17. The temperature at the second hot box 17 is 165°C. It passes through the fourth roller 18, and finally is wound and formed to obtain the elastic differential shrinkage and differential color imitation cotton yarn 19. Among them, the speed of the reference roller 14 is 605.9 m / min, the speed of the auxiliary roller 16 is 592.5 m / min, and the speed of the fourth roller 18 is 578.2 m / min.

[0045] Test Example

[0046] The elastic differential shrinkage and differential color imitation cotton yarns prepared in Examples 1, 2, and 3 were tested with the imitation cotton yarn prepared by a conventional method (Comparative Example 1) and the differential color imitation cotton yarn prepared by a conventional method (Comparative Example 2). The specific test results are shown in Table 1:

[0047]

[0048] Strength: The strength of the differential color and differential shrinkage imitation cotton silk of the present invention can reach above 3.6 cN / dtex.

[0049] Crimp shrinkage rate: It was measured to be above 30% in the present invention, making the fabric made of this yarn not only elastic, but also have a strong fluffiness and a thicker touch.

[0050] Number of loops: The yarn has the physical index of cotton feel. The more data of the number of loops is measured, the stronger the cotton feel is.

[0051] The above are only the embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, various modifications and changes can be made to the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the scope of the claims of the present invention.

Claims

1. A preparation method of an elastic differential shrinkage and differential color imitation cotton yarn, characterized in that The preparation method includes the following steps: S1. After the first raw material yarn (1) which is PTT / PET two-component polyester POY passes through the first roller (7), it is drawn at a first draft ratio of 1.5-1.7 through a hot needle (8) at a temperature of 70-100°C, and then together with the second raw material yarn (2) which is polyester cationic POY, they are respectively fed into the second roller (9); S2. After the first raw material yarn (1) and the second raw material yarn (2) are compounded through the first nozzle (10), they pass through the third roller (11), and then are drawn at a second draft ratio of 1.02-1.18 through a first hot box (12) at a temperature of 160-200°C, and then pass through a disk false twister (13) with a D / Y ratio of 1.5-1.8 and a speed of 350-550 m / min for texturing treatment to obtain a composite yarn, wherein the feeding speeds of the first roller (7), the second roller (9), and the third roller (11) are respectively any one of the following three: The feeding speed of the first roller (7) is 265 m / min, the feeding speed of the second roller (9) is 424 m / min, and the feeding speed of the third roller (11) is 418 m / min, or The feeding speed of the first roller (7) is 200 m / min, the feeding speed of the second roller (9) is 340 m / min, and the feeding speed of the third roller (11) is 335 m / min, or The feeding speed of the first roller (7) is 330 m / min, the feeding speed of the second roller (9) is 551.1 m / min, and the feeding speed of the third roller (11) is 541 m / min, wherein the feeding speed of the second roller (9) is greater than that of the first roller (7), and the feeding speed of the third roller (11) is less than that of the second roller (9) and greater than that of the first roller (7); S3. After the composite yarn passes through a reference roller (14) at a speed of 320-680 m / min, it is compounded with a third raw material yarn (3) which is high-shrinkage polyester FDY through a second nozzle (15), and then sequentially passes through an auxiliary roller (16) at a speed of 340-685 m / min, a second hot box (17) for shaping treatment, and a fourth roller (18) at a speed of 320-340 m / min, and finally is wound and formed to obtain the elastic differential shrinkage and differential color imitation cotton yarn (19); wherein after the first raw material yarn (1) and the second raw material yarn (2) are compounded through the first nozzle (10), they are curled. The first nozzle (10) is sequentially provided with a first through hole (101), a second through hole (102), and a third through hole (103) which are mutually communicated along the yarn movement direction, The first through hole (101), the second through hole (102), and the third through hole (103) constitute the through part for the yarn to move through the first nozzle (10), The first through hole (101) is a supply part for the yarn to enter, the second through hole (102) is an interlacing part for the yarn to be compounded and curled, and the third through hole (103) is a discharge part for discharging the compounded yarn, A plurality of air flow holes (104) communicating with the second through hole (102) are provided on the outer peripheral wall of the first nozzle (10) corresponding to the second through hole (102). The air flow holes (104) supply air flow for making the yarns be compounded and curled, and the flow path of the air flow intersects with the second through hole (102) at an acute angle.

2. The preparation method according to claim 1, wherein the fineness of the PTT / PET bicomponent polyester POY is 44 - 330 dtex; the fineness of the cationic polyester POY is 44 - 330 dtex; the fineness of the high shrinkage polyester FDY is 33 - 111 dtex.

3. An elastic differential shrinkage and differential color imitation cotton yarn prepared by the preparation method according to any one of claims 1 - 2.

4. The elastic differential shrinkage and differential color imitation cotton yarn according to claim 3, wherein in the elastic differential shrinkage and differential color imitation cotton yarn, the content of the PTT / PET bicomponent polyester POY accounts for more than 30% of the total weight of the elastic differential shrinkage and differential color imitation cotton yarn.

5. An elastic differential shrinkage and differential color imitation cotton fabric, wherein the elastic differential shrinkage and differential color imitation cotton fabric is formed by interweaving warp yarns and weft yarns. The warp yarns are PTT / PET bicomponent polyester DTY, and the weft yarns are the elastic differential shrinkage and differential color imitation cotton yarns prepared by the preparation method according to any one of claims 1 - 2 or the elastic differential shrinkage and differential color imitation cotton yarns according to claim 3 or 4.

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