Coreless bidirectional two-for-one twisting wrap yarn and spinning process thereof

Abstract

The invention particularly relates to a coreless bidirectional two-for-one twisting wrap yarn and a wrapping process thereof. The invention provides a coreless two-way two-for-one twisting wrap yarn spinning process, which does not adopt core yarns, and two strands of wrap yarns are twisted and wound in opposite directions. Through verification, no matter how many times the twist degree is, the yarn cannot be twisted and knotted, the rubbing fastness of the cloth cover is greatly improved, and the industrial pain point that the cloth cover of a textile product is prone to pilling is effectively solved.

Description

Technical Field

[0001] The invention relates to the technical field of covered yarn textile technology, in particular to a coreless bidirectional double-twisted covered yarn and a covering process thereof. Background Art

[0002] Covered yarn, also known as parallel yarn or covered yarn, usually uses filament or staple fiber as the core yarn, and the outer layer tightly wraps filament or staple fiber of other materials in a spiral manner. When the elastic modulus of the outer covered yarn is large, the yarn is prone to twisting, knotting, and lumps. Since the covered yarn is mechanically coated, the twist cannot be automatically eliminated. The twist can only be removed by steaming the yarn and setting a tensioner or detwister during the textile process. However, the above removal method can only be applied to slight twists, and severely knotted yarn can only be scrapped, increasing costs.

[0003] In view of the above situation, the inventors believe that the coating speed of fine yarns is slow, the shipment rate is low, and the problem of yarn knotting further increases the production cost. Providing a process to reduce yarn knotting during the coating process is of great significance for enriching the categories of special structural yarns and obtaining higher quality woven products. Summary of the invention

[0004] The present invention finds that when the main yarn and the covering yarn are twisted in opposite directions and the twist difference is controlled within a certain range, the yarn twisting and lumping can be basically eliminated. The covering yarn produced by this process is woven into fabric, which greatly improves the friction fastness of the fabric surface and is not easy to pilling, further enriching the choice of high-end textile fabrics.

[0005] The present invention provides a coating process for a coreless bidirectional double-twisted coated yarn. The coreless bidirectional double-twisted coated yarn comprises a main yarn and a coated yarn, and the two yarns are twisted and wound in opposite directions; wherein the twist of the main yarn is A, the twist of the coated yarn is B, and B is 70% to 90% of A.

[0006] Twisting is a common method for winding filaments into wires and enhancing the properties of yarn strength, elongation, elasticity, flexibility, gloss and feel. However, for yarns with larger elastic modulus, the probability of yarn twisting and knotting will be higher as the twist increases. The above process provided by the present invention can be applied to a wide range of yarns, which can be used for different materials, strands and counts, and technicians can flexibly adjust according to the production needs of downstream enterprises. It has been verified that the materials available for the above main yarn and covering yarn include natural fibers, chemical fibers or other new fibers; natural fibers include but are not limited to cotton, kapok, ramie, flax, hemp, ramie, sisal, mulberry silk, tussah silk, wool, rabbit hair, mohair, alpaca hair, mulberry silk, tussah silk, camel hair, yak hair, coconut shell fiber, asbestos, etc.; chemical fibers include but are not limited to polyester, nylon, acrylic fiber, polypropylene fiber, spandex, vinylon, aramid, nylon, rubber fiber, glass fiber, metal fiber, ceramic fiber, carbon fiber, viscose fiber, modal fiber, lyocell fiber, tencel fiber, cuprammonium fiber, milk fiber, soybean fiber, corn fiber, peanut fiber, diacetate fiber, triacetate fiber, and imitation acetate fiber. In addition, the main yarn and covering yarn can be of the same material or different materials, depending on the processing requirements.

[0007] In addition, the applicable deniers of main yarn and covering yarn include common yarn counts. Expressed in metric count, the deniers of main yarn and covering yarn are 15~450 (N), and common counts are 10, 16, 21, 32, 40, 50, 60, 80, 100, 120 (N); expressed in imperial count, it is 8.78~262.35 (S); expressed in fixed length system, it is 600~20 (denier) or 666.6~22.2 (tex); the two can be the same denier or different deniers.

[0008] The main yarn and the covering yarn may be single-strand or multiple-strand, and the number of strands of the main yarn and the covering yarn may be the same or different. Specifically, the number of strands may be single-strand, two-strand or three-strand.

[0009] The above-mentioned coating process is realized based on a coating yarn machine, and the twist difference is set by adjusting the spindle speed in the coating yarn machine. The coating yarn machine structure and the implementation method of realizing the coreless bidirectional double-twisted coated yarn coating process are as follows: the yarn tube corresponding to the main yarn is fixed at the spindle a of the coating yarn machine, and the yarn tube corresponding to the coated yarn is fixed at the spindle b. The free end of the main yarn passes upward from the internal cavity of the spindle b and is coated, wound and wound with the coated yarn; the above-mentioned twist A and twist B are realized by adjusting the rotation speed of spindles a and spindle b.

[0010] The existing covered yarn machine generally realizes the yarn twisting by rotating the covered spindle. The higher the speed, the higher the twist. Furthermore, the twist of the main yarn and the covered yarn is adjusted according to the material and purpose of the yarn. In some embodiments verified by the present invention, the difference between B and A is more appropriately controlled at 15-25%, that is, B is 75-85% of A; further, B is 78-85% of A, and accordingly, the speed of spindle b is 78-85% of the speed of spindle a. In the best implementation, B is 79%, 80% or 81% of A.

[0011] Specifically, the main yarn and the covered yarn are both nylon filaments with a fineness of 10~3 tex, A is 1100~1300 twists / m, and B is 900~1100 twists / m; the speed of spindle a is 16000~20000 rpm, and the speed of spindle b is 14000~16000 rpm.

[0012] The main yarn and the covering yarn are both spandex filaments with a fineness of 50~30 tex, A is 500~700 twists / m, and B is 400~600 twists / m; the speed of spindle a is 9000~11000 rpm, and the speed of spindle b is 7000~9000 rpm.

[0013] Both the main yarn and the covered yarn are polytetrafluoroethylene filaments with a fineness of 120~100 tex, A is 800~1000 twists / m, and B is 700~800 twists / m; the speed of spindle a is 11000~13000 rpm, and the speed of spindle b is 9000~11000 rpm.

[0014] The main yarn is imitation acetate fiber with a fineness of 90~80 tex, and the covering yarn is nylon with a fineness of 80~70 tex; A is 700~900 twists / m, and B is 550~750 twists / m; the speed of spindle a is 11000~13000 rpm, and the speed of spindle b is 9000~11000 rpm.

[0015] In a second aspect, a coreless bidirectional double-twisted covered yarn prepared by the process of the first aspect is provided.

[0016] Beneficial effects: The coreless bidirectional double-twisted covered yarn provided in the present invention does not use a core wire, but only uses two strands of yarn for covering and winding, so it has better spinnability and lower defect rate. The common technical improvements brought by the above process to the covered yarn are mainly reflected in improving the cohesion of the main yarn and the covered yarn, making the obtained covered yarn uniform, smooth, and stronger, without twisting or lumps, and improving the wear resistance of the covered yarn. During the yarn coating and subsequent weaving process, the covered yarn will not knot or lumps, and the surface of the fabric obtained by weaving will be smoother. Depending on the material of the yarn, the effects brought by the above process also include improving the strength and elasticity of the yarn, and improving the corrosion resistance and wear resistance of the fabric. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a three-dimensional diagram of a covering yarn machine; Figure 2 yes Figure 1 A partial enlarged view of the middle covered yarn machine; Figure 3 It is a partial front view of the covering yarn machine; Figure 4 for Figure 3 A partial enlarged view of the middle covered yarn machine; Figure 5 It is a three-dimensional diagram of the structure of the coated spindle and the bobbin; Figure 6 An exploded view of the cooperation between the covered spindle and the bobbin; Figure 7 It is a bar graph of the strength and elongation of 5.5dex / 3F F coreless double package and 11dtex / 6F in Example 1; Figure 8 It is a bar graph of the strength and elongation of 22dtex / 12F coreless double-wrapped and 44dtex / 36F in Example 1; Fig. 9 The sample is the one used in the pilling and snagging effect test in Example 1; The left side shows the black stockings made by the coreless two-way twist coating process, and the right side shows the skin-colored stockings of the control group; Fig.10 The pilling test results are shown in Example 1 with no weight added and the pilling was repeated 20 times. in, Fig.10 A is the result of black stockings being raised 20 times; Fig.10 B is the result of pilling of black stockings 20 times; Fig.10 C is the result of skin-colored stockings being raised 20 times; Fig.10 D is the result of 20 times of pilling of skin-colored stockings; Fig.11 The pilling results of 50 times without adding weight in the pilling test in Example 1; in, Fig.11 A is the result of black stockings being raised 50 times; Fig.11 B is the result of pilling of black stockings 50 times; Fig.11 C is the result of skin-colored stockings being raised 50 times; Fig.11 D is the result of 50 times of pilling of skin-colored stockings; Fig.12 The pilling test results in Example 1 are as follows: 100g of weight was added to the pilling test 10 times; Among them, among them, Fig.12 A is the result of raising the weight of black stockings 10 times; Fig.12 B is the result of pilling of black stockings with added weight 10 times; Fig.12 C is the result of skin-colored stockings being raised 10 times with added weight; Fig.12 D is the result of 10 times of pilling of skin-colored stockings with added weight; Fig.13 This is the test result of the sock surface with 40 snags; The left side shows the skin-colored stockings of the control group, and the right side shows the black stockings of the experimental group; Fig.14 This is the test result of the sock surface after 100 snags; The left side shows the skin-colored stockings of the control group, and the right side shows the black stockings of the experimental group; Fig.15 This is the test result of the sock surface with 150 snags; The left side shows the skin-colored stockings of the control group, and the right side shows the black stockings of the experimental group; In the figure, 1, spindle a; 2, spindle b; 3, belt I; 4, belt II; 5, frame; 6, bobbin; 7, yarn winding device; 8, main yarn; 9, covered yarn. DETAILED DESCRIPTION

[0018] Example In this embodiment, a coreless bidirectional double-twisted covered yarn and a spinning process thereof are provided. The spinning process is implemented based on a covered yarn machine, such as Figure 1-6 As shown, the coated yarn machine includes a frame 5, on which are provided two layers of coated spindles arranged up and down, namely spindle a1 located at the lower layer and spindle b2 located at the upper layer, the spindle a1 and the spindle b2 have the same structure, which is a hollow structure; spindle a1 and spindle b2 are respectively adapted to be installed with yarn tube 6, which is a detachable structure and can rotate; spindle a1 and spindle b2 are respectively provided with pulleys for driving the yarn tube 6 to rotate; the whole machine also includes transmission belts adapted to the pulleys, namely belt I3 and belt II4, belt I3 and belt II4 can be in close contact with the corresponding pulleys of the coated spindles, and when the belt is driven, the pulley 124 rotates accordingly, and the yarn tube 6 also rotates accordingly.

[0019] A yarn take-up device 7 is installed on the top of the frame 5. The yarn take-up device 7 includes a winding roller and a driving mechanism for driving the winding roller to rotate, so as to achieve the winding of the yarn.

[0020] The main yarn 8 is wound around the bobbin 11 of the spindle a1, and the bobbin 11 on the spindle a1 rotates under the drive of the belt I3 to achieve the twisting of the free end of the main yarn 8. The twist of the main yarn 8 can be adjusted by adjusting the transmission direction and transmission speed of the belt I3. The coated yarn 9 is wound around the bobbin 11 corresponding to the spindle b2, and the spindle b2 is driven by the belt II4 to achieve the twisting of the coated yarn 9. The twist of the coated yarn 9 can be adjusted by adjusting the transmission direction and transmission speed of the belt II4.

[0021] The free end of the main yarn 8 passes upward through the internal cavity of the spindle b2 and is entangled with the two strands of the covered yarn 9 to form a bidirectional double-twisted yarn, which is then wound up in the yarn winding device 7.

[0022] This embodiment provides a coating process for the coreless bidirectional double-twisted coated yarn, and the steps are as follows: The main yarn 8 and the covering yarn 9 are threaded and fixed according to the above scheme, and the belt I3, the belt II4 and the yarn winding device 7 are started to start covering. Among them, the main yarn 8 and the covering yarn 9 are respectively twisted by S and Z. In this embodiment, the type of yarn wound on the spindle a1 and the spindle b2 and the rotation speed of the covering rotor are adjusted.

[0023] In order to verify the influence of the above process on the performance of the coated yarn, the present invention designs the following performance test: 1. Strength and elastic elongation performance verification 1. Experimental Materials Table 1 Test materials 2. Experimental methods: The two yarns described in "2. Experimental Materials" were made into corresponding coreless bidirectional double-twisted covered yarns using the covering machine in the embodiment, and the elongation and strength of the coreless bidirectional double-twisted covered yarn and the raw yarn of the same length and thickness were measured using an electronic single yarn strength tester (model: YG020).

[0024] Covering process: For Huading 5.5dtex / 3F yarn, the main yarn twist is 1000 and the covered yarn twist is 800; for Meihua 22dtex / 12F yarn, the main yarn twist is 800 and the covered yarn twist is 640.

[0025] 3. Experimental data: 3.1 Spun yarn measurement results Table 25. Comparison between 5dex / 3F coreless double package and 11dtex / 6F The comparison results are as follows Figure 7 shown.

[0026] 3.2 Roving measurement results Table 3 Comparison results between 22dtex / 12F coreless double-wrapped and 44dtex / 36F The comparison results are as follows Figure 8 According to the results shown in 3.1 and 3.2, the strength and elastic elongation of coreless double-covered yarn with the same fineness (thickness) are higher than those of the original yarn with the same thickness.

[0027] 2. Coreless bidirectional twisted covered yarn Table 4 Process and effect of coreless bidirectional twisted covered yarn of different materials In the four examples recorded in Table 4 above, the twist direction of the covered yarn is S, and the twist direction of the main yarn is Z. Table 4 is only an example of different material yarns and different performances, and does not mean that the process of the present invention has only the above four feasible implementation methods.

[0028] In Example 1, the nylon prepared by the coreless bidirectional double-twisted covered yarn process has improved wear resistance, good filament yarn bonding, uniform yarn winding, and no knots. After being woven into cloth, the surface is smooth and not prone to snagging.

[0029] In Example 2, the spandex coated yarn prepared by the coreless bidirectional double-twisted coated yarn process can further increase the elasticity and recovery of the spandex filaments, and can be applied to special-purpose clothing such as swimwear and body shapers to obtain better elasticity and extend the service life of the above clothing.

[0030] In Example 3, the polytetrafluoroethylene filament coated yarn prepared by the coreless bidirectional double-twisted coated yarn process has good yarn bonding tightness, which is more conducive to subsequent processing, and the textile film-forming material has good high and low temperature resistance, wear resistance, and corrosion resistance.

[0031] In Example 4, due to the different hydrophilicity of acetate fiber and hydrophobicity of nylon, wrinkles and hairiness are likely to appear on the surface of the blended fabric. The acetate fiber and nylon covered yarn prepared by the coreless two-way double twisted covered yarn process can effectively improve the wear resistance of the yarn and increase the strength. After being spun into fabrics, the disadvantage of acetate fiber's poor wear resistance is effectively improved, and the surface of the fabric will not wrinkle or hair.

[0032] 3. Pilling and snagging effect verification 1. Experimental instruments: YG502 pilling tester; YG518-IIA fabric snagging tester; 2. Experimental samples: Fig. 9 , the left side is the black stockings of the experimental group, and the right side is the skin-colored stockings of the control group, both of which are prepared using the process of Example 1 in Table 4.

[0033] 1. Pilling effect test 1. Experimental methods The stockings of the experimental group and the control group were fixed, and the pilling tester was adjusted to test the pilling of the stockings on their surfaces for 20 times without weight, 50 times without weight, and 10 times with a weight of 100 g.

[0034] 2. Experimental results like Figure 10-12 As shown in the figure, under the same strength, the pilling and fuzzing degree of black stockings is significantly weaker than that of skin-colored stockings. The comparison results prove that the process of coreless two-way double-twisted covered yarn can effectively improve the anti-pilling and fuzzing effect of covered yarn and fabric.

[0035] (II) Test of the hooking effect 1. Experimental methods Put the above experimental group and control group stockings on a white sock board, adjust the instrument speed to 40 rpm, 100 rpm, and 150 rpm respectively, and compare the surfaces of the two stockings.

[0036] 2. Experimental results like Figure 13-15 As shown in the figure, the left side shows the results of skin-colored stockings snagging in the control group, and the right side shows the results of black stockings snagging. It can be seen that no matter what the rotation speed is, no holes are produced on the black socks, while the skin-colored stockings are snagging at low rotation speeds, and holes appear directly at high rotation speeds. The above results show that the anti-snagging effect of black stockings is better than that of skin-colored stockings, proving that the coreless bidirectional double-twisted covered yarn process provided by the present invention can effectively improve the mechanical strength of the fabric, improve the surface firmness, and reduce the probability of fuzzing and snagging.

Claims

1. A coating process for coreless bidirectional double-twisted coated yarn, characterized in that: The coreless bidirectional double-twisted covered yarn includes a main yarn and a covering yarn, and the two yarns are twisted and wound in opposite directions; wherein the twist of the main yarn is A, and the twist of the covering yarn is B, and B is 70% to 90% of A.

2. The coating process of coreless bidirectional double twisted coated yarn as claimed in claim 1, characterized in that: The materials of the main yarn and the covering yarn are selected from natural fibers, chemical fibers or other new fibers; the main yarn and the covering yarn are made of the same or different materials.

3. The coating process of coreless bidirectional double twisted coated yarn as claimed in claim 1, characterized in that: The deniers of the main yarn and the covering yarn are selected from 15-450N, or 8.78-262.35S, or 600-20 denier, or 666.6-22.2 tex; the main yarn and the covering yarn have the same or different deniers.

4. The coating process of coreless bidirectional double twisted coated yarn as claimed in claim 1, characterized in that: The main yarn and the covering yarn are selected from single-ply, two-ply or three-ply yarns respectively.

5. The coating process of coreless bidirectional double twisted coated yarn as claimed in claim 1, characterized in that: B is 75~85% of A; further, B is 78~85% of A.

6. The coating process of coreless bidirectional double twisted coated yarn as claimed in claim 1, characterized in that: The covering process is realized based on a covering yarn machine, and the twist difference is set by adjusting the speed of the covering spindle in the covering yarn machine. The covering yarn machine structure and the implementation method of realizing the coreless bidirectional double-twisted covered yarn covering process are as follows: the yarn tube corresponding to the main yarn is fixed at spindle a of the covering yarn machine, and the yarn tube corresponding to the covered yarn is fixed at spindle b. The free end of the main yarn passes upward from the internal cavity of spindle b and is covered, wound and taken up with the covering yarn; A and B are realized by adjusting the rotation speed of spindle a and spindle b, and the rotation speed of spindle b is 78~85% of the rotation speed of spindle a.

7. The coating process of coreless bidirectional double twisted coated yarn as claimed in claim 6, characterized in that: The main yarn and the covering yarn are both nylon filaments with a fineness of 10-3 tex, A with a twist / m of 1100-1300, and B with a twist / m of 900-1100; the speed of spindle a is 16000-20000 rpm, and the speed of spindle b is 14000-16000 rpm; Or, the main yarn and the covering yarn are both spandex filaments with a fineness of 50-30 tex, A with a twist / m of 500-700, and B with a twist / m of 400-600; the speed of spindle a is 9000-11000 rpm, and the speed of spindle b is 7000-9000 rpm; Or, the main yarn and the covering yarn are both polytetrafluoroethylene filaments, the fineness is 120-100 tex, A is 800-1000 twists / m, B is 700-800 twists / m; the speed of spindle a is 11000-13000 rpm, and the speed of spindle b is 9000-11000 rpm; Or, the main yarn is imitation acetate fiber with a fineness of 90~80 tex, the covering yarn is nylon with a fineness of 80~70 tex; A is 700~900 twists / m, B is 550~750 twists / m; the speed of spindle a is 11000~13000 rpm, and the speed of spindle b is 9000~11000 rpm.

8. A coreless bidirectional double-twisted covered yarn prepared by the process of any one of claims 1 to 7.

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