Manufacturing method of moisture-regulating black cotton-like fiber

Abstract

The objective of the present invention is to provide a method for producing black flocculent fibers, in which polyester fiber POY containing carbon black and polyester fiber FDY are sequentially processed by DTY processing technology through a first yarn guide, a guide roller, a tensor, a first feed roller, a pre-entangler, a second feed roller, a first heating box, a cooling plate, a pre-twister, a third feed roller, an intermediate entangler, a heat setting chamber, a heat setting feed roller, oiling and winding to become black flocculent fibers, in which the first yarn guide is a guide wheel, the running strand contacts the groove bottom of the first guide wheel to drive the rotation of the first guide wheel, the tensor is a magnetic tensor, the strand passes through the tensor to form an angle of 140°~160°, the tensor tension is set to 7~10CN, and the linear speed ratio between the first feed roller and the second feed roller is 1.03~1.04. According to the present invention, wear on the first yarn guide can be reduced, the number of entanglements of the strands can be increased, and the entanglement of the strands is less likely to come loose.

Description

[Technical field]

[0001] The present invention relates to the field of cotton-like fiber technology, and in particular to a method for producing moisture-regulating black cotton-like fiber. [Background technology]

[0002] Cotton-like fibers generally refer to fibers made from polyethylene terephthalate, a polymer of terephthalic acid and ethylene glycol, and are the synthetic fibers most widely used and produced. Cotton-like fibers currently on the market are mainly divided into partially oriented yarn (POY), fully drawn yarn (FDY), and drawn textured yarn (DTY), etc.

[0003] POY refers to undrawn yarn produced by high-speed spinning (spinning speed: 3000~3600m / min) and has a lower degree of orientation and crystallinity than drawn yarn produced by normal spinning, but a higher degree of orientation than undrawn yarn produced by normal spinning. With the commercialization of high-speed winding machines, high-speed spinning technology has developed rapidly since the 1970s, enabling the industrial production of POY. POY has a certain degree of orientation and can be made into DTY directly through the drawing and deformation processes, simplifying yarn processing.

[0004] FDY is a fiber that is given sufficient orientation by adding a drawing process to high-speed POY spinning and integrating spinning, drawing and winding technology. It has almost the same degree of orientation as POY, but has a higher degree of crystallinity. Although POY and FDY have a certain degree of orientation, they are not yet stable in other properties compared to finished fibers, so they cannot be directly made into fabrics and require post-processing, of which more than 90% of post-processing is to make DTY through drawing and deformation processes. Polyester DTY is a yarn that uses the thermoplasticity of the fiber to give it a spring-like crimp shape through deformation and heat setting, giving it bulkiness and elasticity. Fabrics made from DTY have excellent bulkiness and heat retention, and are usually used for clothing, tents, bags, etc.

[0005] In addition, the masterbatch containing carbon black is currently widely used for dyeing polyester filaments, but the inorganic additives such as carbon black cause the surface roughness of the yarn to increase. Therefore, in the deformation processing of black floss-like fibers, the yarn guide is easily worn out, shortening its service life, while the high friction between the yarn and the yarn guide has a negative effect on the performance of the yarn. For example, the yarn guide has grooves on its surface due to wear, which increases the roughness and provides a large resistance tension to the yarn, and if the yarn tension is too high, the entanglement by the interlacing nozzle is easily loosened, and the initial interlacing of the yarn cannot be achieved. Therefore, it is necessary to optimize the manufacturing technology of black polyester DTY in order to overcome the problems of yarn guide wear and high yarn tension and improve the stability of the initial interlacing of the yarn. Summary of the Invention [Problem to be solved by the invention]

[0006] The present invention provides a method for producing a moisture-regulating black floss fiber to overcome the problems in the prior art. [Means for solving the problem]

[0007] The method for producing the moisture-conditioning black cotton-like fiber of the present invention is briefly as follows. Polyester fiber POY and polyester fiber FDY are processed by DTY processing technology, and then passed through the first yarn guide, guide roller, tensor, first feed roller, pre-entangler, second feed roller, first heating box, cooling plate, pre-twister, third feed roller, intermediate entangler, heat setting chamber, heat setting feed roller, oiling and winding to become moisture-regulating black cotton fiber. Both polyester fiber POY and polyester fiber FDY contain carbon black, The first yarn guide is a guide wheel, The running starter comes into contact with the bottom of the groove of the first guide wheel, driving the rotation of the first guide wheel. The tensor is a magnetic tensor (a tension control device that converts torque using a magnetic field to generate damping force, has no mechanical friction, is small in size and easy to install), and the tension is set to 7~10CN (when the first yarn guide is a guide wheel instead of a bar guide, the strand tension can be significantly reduced, but it becomes difficult to control the strand tension and becomes unstable, causing sudden strand vibration; by doing this, the strand vibration can be suppressed). The linear velocity ratio between the first feed roller and the second feed roller is set to 1.03 to 1.04 (to provide a certain amount of supercharge and facilitate the execution of initial entanglement).

[0008] Preferably, in the method for producing the moisture-conditioning black cotton-like fiber, The rim width of the first yarn guide (see FIG. 2) is 20-25 mm, the housing outer diameter is 9.4-10.7 mm, and the rolling bearing hole diameter is 6-7.4 mm; The material of the housing of the first yarn guide is ceramic, its surface hardness is 1500 to 2000HV (Vickers hardness), and the friction coefficient between the housing and the stand is 0.2 to 0.22 (according to the method described in the literature "Measurement and Analysis of the Friction Coefficient of High Performance Fibers"); The tension of the strand at the initial entanglement is 2.5~5.0CN (after DTY processing is continued for one year, the strand tension is still limited within this range). The carbon black content in the polyester fiber POY and polyester fiber FDY is 1.2 to 1.5 wt%. The average particle size of the carbon black is 0.3 to 0.5 μm. The specifications of the polyester fiber POY and the polyester fiber FDY are both 120 detx / 96 f, and the linear density of the obtained moisture-regulating black cotton-like fiber is 232 dtex. The main process parameters in the deformation process are: pre-entangler nozzle air pressure 2.5-2.9 bar, pre-entangler nozzle hole diameter 1.5-1.7 mm, first heating box temperature 175-190°C, heat setting chamber temperature 150-160°C, linear speed ratio (draw ratio) between the third feed roller and the second feed roller 1.1-1.14, heat setting supercharge rate 4.0-5.0%, winding speed 500-600 m / min, winding supercharge rate 2.0-2.3%; The moisture-regulating black cotton fiber has a breaking strength of 2.1-2.3cN / dtex (measurement standard: GB / T 14344), an intertwining number of 90-100 pieces / m (measurement standard: FZ / T 50001-2005), and a breaking strength CV value of ≦6.00%. The changes in breaking strength, entanglement number and breaking strength CV value of the moisture-regulating black cotton-like fiber produced continuously for 60 days were all less than 10%, i.e., compared with the moisture-regulating black cotton-like fiber produced on the first day, the decrease in breaking strength and entanglement number of the fiber obtained after continuous production for two months was less than 10%, and the increase in breaking strength CV value did not exceed 10%.

[0009] The principle of the present invention is as follows.

[0010] When polyester filaments are colored with carbon black masterbatch, the surface roughness of the strands increases. The yarn guide commonly used in conventional deformation processing technology does not have a driven shaft and cannot rotate, so sliding friction occurs between the strands and the yarn guide. After just 3 to 5 days from the start of polyester DTY processing, the first yarn guide is already worn out and grooves appear on its surface. When the strands pass through these grooves, the tension increases due to the greater frictional resistance, and can reach 20 to 25 cN. In addition, the first feed roller pinch is based on two rolls pressing against each other, and there is a possibility of strand slippage when the pinch force is insufficient, so the tension of 20~25cN in the first yarn guide increases the initial strand tension to 6~8cN (with sufficient pinch force, the strand tension is only affected by the overfeed rate, but if the pinch force is insufficient, the strand tension before the first feed roller affects the next strand tension. In other words, if the strand tension before the first feed roller is too large, the next strand tension is improved). Under too large strand tension, the pre-interlacer can hardly tighten the strand entanglement, and the interlacing is easy to loosen. Therefore, if the number of interlacings of POY / FDY bicomponent blended yarns with different physical properties is small, the bundling ability decreases, and when passing through the subsequent weaving process, it is easy to cause yarn breakage and pilling, which significantly deteriorates the quality of the fabric.

[0011] In the present invention, by using the guide wheel as the first yarn guide for deformation processing, the sliding friction between the yarn and the yarn guide is converted into rolling friction, which not only reduces wear on the yarn guide but also significantly reduces the tension of the strand passing through the first yarn guide.

[0012] If the first yarn guide is replaced with a guide wheel, the strand tension can be significantly reduced, but it becomes difficult to stably control the strand tension within a certain range, and sudden vibration of the strand may occur, making it impossible to carry out production. Therefore, the present invention applies a certain tension to the strand by using a magnetic tensor and a guide roller. Specifically, the magnetic tensor and guide roller are located between the first yarn guide and the first feed roller, and the steric tensor is located next to the first feed roller. When the strand passes through the magnetic tensor, the running direction is changed and the strand is made to have a certain angle and pressure is applied to the tensor. Conversely, the tensor applies resistance to the strand by magnetic attenuation, stabilizing the angle, and thus tension is generated in the strand. In addition, the guide roller can suppress the strand vibration and cooperate with the tensor in controlling the strand tension.

[0013] In the present invention, the tension of the magnetic tensor is set within the range of 7 to 10 cN to significantly suppress the vibration of the strands and stably control the movement of the strands. If the tension is too large or too small, it is disadvantageous for stabilizing the initial entanglement.

[0014] In the present invention, the tension of the strand undergoing initial entanglement is set to 2.5-5.0 cN so that the linear speed ratio (supercharge rate) between the first feed roller and the second feed roller is 1.03-1.04 (if the clamping force of the first feed roller is insufficient, the tension of the strand before the first feed roller affects the tension of the next strand. However, by adopting a guide wheel instead of a bar guide and controlling the strand tension with a magnetic tensor, the tension of the strand before the first feed roller is significantly reduced, thereby overcoming the difficulty of controlling the strand tension by the supercharge rate and realizing the tension of the strand undergoing initial entanglement to be 2.5-5.0 cN). This makes it possible to perform stable interlacing processing and tight entanglement of the strands. Effect of the Invention

[0015] The advantages of the manufacturing method of the moisture-regulating black cotton-like fiber of the present invention are: 1. The number of entanglements of the strands is high, so that the entanglements are less likely to come loose, and the resulting moisture-regulating black cotton-like fiber is less likely to break and is suitable for weaving fabrics with flat surfaces; 2. It is suitable for strands that undergo DTY processing and can provide stable tension; 3. The resulting moisture-regulating black cotton-like fiber has excellent performance; and 4. It reduces wear on the first yarn guide and avoids part loss. [Brief description of the drawings]

[0016] [Figure 1] FIG. 2 is a schematic diagram showing the flow of the processing steps of the present invention. [Diagram 2] 1 is a schematic diagram showing a cross-sectional structure of a guide wheel of the present invention, 1-polyester fiber POY and polyester fiber FDY, 2-first yarn guide, 3-guide roller, 4-tensor, 5-first feed roller, 6-pre-entangler, 7-second feed roller, 8-first heating box, 9-cooling plate, 10-pre-twister, 11-third feed roller, 12-intermediate entangler, 13-thermal fixation chamber, 14-thermal fixation feed roller, 15-oiling DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0017] The present invention will be described in more detail below with reference to examples, but the present invention is not limited to the following examples as long as it does not exceed the gist of the present invention. Even if various modifications of the present invention are permitted by a person skilled in the art who has read the contents of the present invention, they are also limited within the scope of the claims of the present invention as equivalent forms of the present invention.

[0018] In Example 1, the breaking strength, entanglement number, and breaking strength CV value of the moisture-regulating black cotton-like fiber obtained on the first day refer to the average values ​​of the performance indexes of the fiber produced in one day, and the breaking strength, entanglement number, and breaking strength CV value of the moisture-regulating black cotton-like fiber obtained after continuous production for 60 days refer to the average values ​​of the performance indexes of the fiber produced in the 11 days on the 60th day.

[0019] Referring to FIG. 1, the flow of producing moisture-regulating black cotton-like fiber by DTY processing technology is as follows: 1-polyester fiber POY and polyester fiber FDY containing carbon black with an average particle size of 0.3 to 0.4 μm are sequentially passed through 2-first yarn guide, 3-guide roller, 4-tensor, 5-first feed roller, 6-pre-entangler, 7-second feed roller, 8-first heating box, 9-cooling plate, 10-pre-twister, 11-third feed roller, 12-intermediate entangler, 13-thermal setting chamber, 14-thermal setting feed roller, and 15-oiling and winding to become moisture-regulating black cotton-like fiber.

[0020] Example 1 The manufacturing method of moisture-regulating black cotton fiber is carried out by the above-mentioned DTY processing process, in which the specifications of polyester fiber POY and polyester fiber FDY are both 120detx / 96f, and the carbon black content of both is 1.2wt%. The first yarn guide is a guide wheel, and the running starter comes into contact with the groove bottom of the first guide wheel to drive the rotation of the first guide wheel. The material of the guide wheel housing is ceramic, its surface hardness is 1500HV, and the friction coefficient between the housing and the starter is 0.2. As shown in Figure 2, the rim width of the guide wheel is 20mm, the outer diameter of the housing is 9.4mm, the rolling bearing hole diameter is 6mm, the tensor is a magnetic tensor, and the tensor tension is set to 10CN. Further, the process parameters are as follows: pre-entangler nozzle air pressure 2.5 bar, pre-entangler nozzle hole diameter 1.5 mm, first heating box temperature 175°C, heat setting chamber temperature 160°C, linear velocity ratio between the first feed roller and the second feed roller 1.03, linear velocity ratio between the third feed roller and the second feed roller 1.1, heat setting supercharge rate 4%, winding speed 500 m / min, and winding supercharge rate 2%. Using the above technology, continuous production was carried out, with the tension of the strands at the initial entanglement being 3.7cN. The moisture-regulating black cotton-like fiber obtained on the first day had a breaking strength of 2.3cN / dtex, an entanglement number of 90 pieces / m, and a breaking strength CV value of 5.15%. After 60 days of continuous production, the moisture-regulating black cotton-like fiber obtained has a breaking strength of 2.2 cN / dtex, an entanglement number of 85 / m, and a breaking strength CV value of 5.65%.

[0021] Referring to FIG. 1 and FIG. 2, an embodiment of the present invention includes: Comparative Example 1 The manufacturing method of the moisture-conditioning black flocculent fiber is almost the same as that of Example 1, except that the first yarn guide and the tensor are replaced with bar guides that cannot rotate, and the fiber does not pass through a guide roller. The breaking strength of the moisture-conditioning black flocculent fiber obtained on the first day was 2.1 cN / dtex, the number of entanglements was 93 / m, and the breaking strength CV value was 6.2%. After continuous production for 10 days, the breaking strength of the moisture-conditioning black flocculent fiber obtained was 1.8 cN / dtex, the number of entanglements was 74 / m, and the breaking strength CV value was 7.6%, and production could not be continued after 60 days. Comparing Example 1 with Comparative Example 1, it can be seen that the breaking strength, number of entanglements, and breaking strength CV value of the moisture-conditioning black flocculent fiber all change significantly. The reason for this is that the wear of the first yarn guide has a significant effect on the fiber quality.

[0022] Example 2 The manufacturing method of moisture-regulating black cotton fiber is carried out by the above-mentioned DTY processing process, in which the specifications of polyester fiber POY and polyester fiber FDY are both 120detx / 96f, and the carbon black content of both is 1.3wt%. The first yarn guide is a guide wheel, and the running starter comes into contact with the groove bottom of the first guide wheel to drive the rotation of the first guide wheel. The material of the guide wheel housing is ceramic, its surface hardness is 1800HV, and the friction coefficient between the housing and the starter is 0.2. As shown in Figure 2, the rim width of the guide wheel is 20mm, the outer diameter of the housing is 9.4mm, the rolling bearing hole diameter is 6.2mm, the tensor is a magnetic tensor, and the tensor tension is set to 9.2CN. Further, the process parameters are as follows: pre-entangler nozzle air pressure 2.6 bar, pre-entangler nozzle hole diameter 1.5 mm, first heating box temperature 178°C, heat setting chamber temperature 152°C, linear velocity ratio between the first feed roller and the second feed roller 1.03, linear velocity ratio between the third feed roller and the second feed roller 1.12, heat setting supercharge rate 4.2%, winding speed 520 m / min, and winding supercharge rate 2.2%. Using the above technology, continuous production was carried out, with the tension of the strands at the initial entanglement being 2.5cN. The moisture-regulating black cotton-like fiber obtained on the first day had a breaking strength of 2.2cN / dtex, an entanglement number of 97 pieces / m, and a breaking strength CV value of 5.05%. After 60 days of continuous production, the moisture-regulating black cotton-like fiber obtained has a breaking strength of 2.1 cN / dtex, an entanglement number of 89 / m, and a breaking strength CV value of 5.46%.

[0023] Example 3 The manufacturing method of moisture-regulating black cotton fiber is carried out by the above-mentioned DTY processing process, in which the specifications of polyester fiber POY and polyester fiber FDY are both 120detx / 96f, and the carbon black content of both is 1.4wt%. The first yarn guide is a guide wheel, and the running starter comes into contact with the groove bottom of the first guide wheel to drive the rotation of the first guide wheel. The material of the guide wheel housing is ceramic, its surface hardness is 1880HV, and the friction coefficient between the housing and the starter is 0.22. As shown in Figure 2, the rim width of the guide wheel is 23mm, the outer diameter of the housing is 10.2mm, the rolling bearing hole diameter is 7mm, the tensor is a magnetic tensor, and the tensor tension is set to 8.7CN. Further, the process parameters are as follows: pre-entangler nozzle air pressure 2.8 bar, pre-entangler nozzle hole diameter 1.6 mm, first heating box temperature 184°C, heat setting chamber temperature 155°C, linear velocity ratio between the first feed roller and the second feed roller 1.04, linear velocity ratio between the third feed roller and the second feed roller 1.13, heat setting supercharge rate 4.5%, winding speed 565 m / min, winding supercharge rate 2.7%. Using the above technology, continuous production was carried out, with the tension of the strands at the initial entanglement being 4.5cN. The moisture-regulating black cotton-like fiber obtained on the first day had a breaking strength of 2.3cN / dtex, an entanglement number of 100 pieces / m, and a breaking strength CV value of 5.32%. After 60 days of continuous production, the moisture-regulating black cotton-like fiber obtained has a breaking strength of 2.2 cN / dtex, an entanglement number of 92 pieces / m, and a breaking strength CV value of 5.86%.

[0024] Example 4 The manufacturing method of moisture-regulating black cotton fiber is carried out by the above-mentioned DTY processing process, in which the specifications of polyester fiber POY and polyester fiber FDY are both 120detx / 96f, and the carbon black content of both is 1.5wt%. The first yarn guide is a guide wheel, and the running starter comes into contact with the groove bottom of the first guide wheel to drive the rotation of the first guide wheel. The material of the guide wheel housing is ceramic, its surface hardness is 2000HV, and the friction coefficient between the housing and the starter is 0.22. As shown in Figure 2, the rim width of the guide wheel is 25mm, the outer diameter of the housing is 10.7mm, the rolling bearing hole diameter is 7.4mm, the tensor is a magnetic tensor, and the tensor tension is set to 7CN. Further, the process parameters are as follows: pre-entangler nozzle air pressure 2.9 bar, pre-entangler nozzle hole diameter 1.7 mm, first heating box temperature 190°C, heat setting chamber temperature 160°C, linear velocity ratio between the first feed roller and the second feed roller 1.04, linear velocity ratio between the third feed roller and the second feed roller 1.14, heat setting supercharge rate 4.2%, winding speed 600 m / min, and winding supercharge rate 3%. Using the above technology, continuous production was carried out, with the tension of the strands at the initial entanglement being 5.0 cN. The moisture-regulating black cotton-like fiber obtained on the first day had a breaking strength of 2.2 cN / dtex, an entanglement number of 93 pieces / m, and a breaking strength CV value of 5.25%. After 60 days of continuous production, the moisture-regulating black cotton-like fiber obtained has a breaking strength of 2.1 cN / dtex, an entanglement number of 87 / m, and a breaking strength CV value of 5.86%.

Claims

1. A method for manufacturing filamentary black imitation cotton fibers using a DTY drawing process, comprising: Passing polyester fiber POY and polyester fiber FDY through a first yarn guide, a guide roller, a tensiometer, a first feed roller, a preliminary interlacer, a second feed roller, a first heat box for texturing, a cooling plate, a false twister, a third feed roller, an intermediate interlacer, a heat setting heat box, and a heat setting feed roller in sequence, oiling them, and winding up and obtaining the black imitation cotton fibers; Both the polyester fiber POY and the polyester fiber FDY contain carbon black; The first yarn guide is a guide wheel having grooves formed on its outer peripheral surface; During the running of the strand, it contacts the bottom of the groove of the guide wheel which is the first yarn guide to drive the rotation of the first yarn guide; The tensiometer is a magnetic tensiometer and has a guide wheel with grooves formed on its outer peripheral surface; During the running of the strand, it contacts the bottom of the groove of the guide wheel which the tensiometer has; The tension of the tensiometer is set to 7 - 10 cN; The linear velocity ratio between the first feed roller and the second feed roller is 1.03 - 1.

04. A method for manufacturing black imitation cotton fibers, characterized in that.

2. The first yarn guide is made of ceramics, the surface hardness of its groove bottom is 1500 - 2000 HV, and the friction coefficient between the groove bottom and the strand is 0.2 - 0.

22. The method for manufacturing black imitation cotton fibers according to Claim 1, characterized in that.

3. The tension of the strand during preliminary interlacing is 2.5 - 5.0 cN. The method for manufacturing black imitation cotton fibers according to Claim 1, characterized in that.

4. The carbon black content in both the polyester fiber POY and the polyester fiber FDY is 1.2 - 1.5 wt%. The method for manufacturing black imitation cotton fibers according to Claim 1, characterized in that.

5. The average particle size of the carbon black is 0.3 - 0.4 μm. The method for manufacturing black imitation cotton fibers according to Claim 4, characterized in that.

6. The black imitation cotton fibers have a breaking strength of 2.1 - 2.3 cN / dtex, an interlacing degree of 90 - 100 pieces / m, and a CV value of the breaking strength of ≤ 6.00%; The change rates of the breaking strength, interlacing degree, and CV value of the breaking strength of the black imitation cotton fibers continuously manufactured over 60 days are all 10% or less. The method for manufacturing black imitation cotton fibers according to Claim 1, characterized in that.

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