Composite elastic spandex wrap yarn and preparation method thereof
By adjusting the outlet air velocity and process parameters of the cooling device, the problem of loose bonding between spandex and polyester in composite elastic spandex-coated yarn was solved, achieving fiber uniformity and excellent elasticity.
Patent Information
- Application Number
- CN202511081169.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-08-04
- Publication Date
- 2025-11-21
AI Technical Summary
Existing composite elastic spandex-covered yarns are insufficient in terms of elasticity, and the spandex and polyester-covered yarns are not tightly bonded, making them prone to separation.
By adjusting the wind speed generated by the outlet of the cooling device on the yarn bundle during the texturing process of polyester POY yarn, the difference between different segments of fibers in the yarn cake is reduced, ensuring the uniformity of fiber physical properties. The air volume at the inlet of the cooling device is controlled by an electric valve to adjust the wind speed. Combined with appropriate process parameters such as texturing speed, draw ratio and hot box temperature, the tight composite of spandex and polyester is achieved.
It improves the elasticity and overall performance of the composite elastic spandex-covered yarn, avoids phase separation between spandex and polyester, and ensures that the fiber is soft to the touch and has excellent elasticity.
Smart Images
Figure CN120989780A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The application belongs to the technical field of covering yarn preparation and relates to a composite elastic spandex covering yarn and a preparation method thereof. BACKGROUND
[0002] With the improvement of people's living standards, elastic fabrics are more and more favored by people due to their good elasticity and comfort, and the composite elastic spandex covering fiber is a spandex covering yarn formed by spandex and polyester filament elasticization. The composite elastic spandex covering fiber can fully exert the high elastic performance of spandex filaments and has the excellent properties of the outer polyester filaments, and has broad development prospects in the fields of clothing and industrial textiles.
[0003] The composite elastic spandex covering fiber is prepared by compounding spandex with polyester pre-oriented yarn during elasticization. However, the above-mentioned fiber has great deficiencies in elasticity, and the conventional spandex covering yarn has poor combination between the covering yarn and the core yarn, and the covering yarn and the core yarn can be separated during use.
[0004] Patent CN114150412A discloses a preparation method of spandex composite covering yarn. The low-melting-point polyamide 6 and polyester FDY mixed filaments are combined with spandex through a network nozzle, and hot air with a temperature of 90-150 DEG C is sprayed from the network nozzle to heat the low-melting-point polyamide 6 and the surface of the low-melting-point polyester FDY, and the spandex is adhered to solve the problem of separation of spandex and covering yarn. However, the elastic recovery force of polyamide is much lower than that of spandex, which leads to insufficient elasticity of the composite elastic spandex covering yarn.
[0005] Therefore, it is of great significance to study a composite elastic spandex covering yarn and a preparation method thereof to solve the problems in the prior art. SUMMARY
[0006] The application aims to solve the problems in the prior art and provide a composite elastic spandex covering yarn and a preparation method thereof.
[0007] To achieve the above-mentioned purposes, the technical solutions adopted by the application are as follows.
[0008] The application discloses a preparation method of a composite elastic spandex covering yarn. The spandex is combined with a polyester POY yarn between a false twister and a second roller in an elasticizing process of the polyester POY yarn, and sequentially passes through the second roller, a networker, a second heat box, a guide, a third roller, oiling and winding to obtain the composite elastic spandex covering yarn. The polyester POY yarn is prepared by extruding a polyester melt through a spinneret, and sequentially passing through cooling, oiling, a first guide roller, pre-networking, a second guide roller and winding to obtain the polyester POY yarn. In the preparation process of the polyester POY yarn, the set value of the air speed generated by the cooling device outlet to the yarn bundle is a, the air speed generated by the cooling device outlet to the yarn bundle is adjusted to 88%a-92%a at the starting point of the winding process of the polyester POY cake, the air speed of the cooling device outlet is adjusted to 93%a-97%a at the third second, and the air speed generated by the cooling device outlet to the yarn bundle is adjusted to a at the xth second. The xth second refers to the time when the yarn is wound on the paper tube for 1306-1500 m. According to experience, the paper tube is full of one layer of yarn at this time. Specifically, according to the outer diameter of the paper tube, the moving distance of the traversing mechanism (the yarn is wound on the paper tube to form a cake, the moving distance of the traversing mechanism controls the width of the cake, and the width of the cake is smaller than the length of the wound paper tube), and the specification of the fiber, the length of the full layer of yarn is different.
[0009] The process parameters in the preparation process of the polyester POY yarn include that the intrinsic viscosity of the polyester POY yarn raw material is 0.620-0.635 dL / g, the temperature of the spinning box is 285-290 DEG C, the spinneret assembly pressure is 15-18 MPa, the spinneret hole diameter is 0.2-0.25 mm, the height of the windless zone is 40-60 mm, the cooling air temperature is 20-22 DEG C, a is 2.1-2.5 m / s, and the winding speed is 2800-3100 m / min. The above parameters have a great influence on the breaking elongation, and under the value range of the process parameters, the difference of the surface yarn of the cake prepared according to the above setting is negligible.
[0010] In the preparation process of polyester POY yarn, the speed of spindle is usually increased 5-10s before full winding head switching to increase the tension of the yarn, so as to avoid the failure of switching caused by too small tension when the friction roller leaves the spindle, which is called switching overfeed; when the full winding head switching is completed, the spindle is still in the state of overfeed, and it needs to be restored to the original winding speed in 3s; however, the winding speed is still greater than the original winding speed in the 3s, and in the process of fiber preparation, when the winding speed increases, the fiber is cold stretched between the second guide disc and the winding speed, the stretching degree of macromolecules in polyester fiber is higher, the fiber property is more stable, the orientation degree is increased, the birefringence and strength are increased, and the fiber exhibits thermal stress increase, so the breaking elongation is reduced. Therefore, the breaking elongation of the fiber produced in 3s is lower than the normal level. In the process of winding the yarn, the fiber is affected by the oil and water absorption of the paper tube, and the moisture of the fiber close to the paper tube (i.e. the fiber produced before the xth second is affected) is less, so the fiber is hardened, and the breaking elongation is also reduced.
[0011] Under the premise of ensuring cooling, reducing the wind speed generated by the cooling device outlet to the yarn is equivalent to moving down the cooling solidification point of the fiber, and the radial velocity gradient in the fiber forming process is small, so as to reduce the radial birefringence and strength of the fiber, and the fiber exhibits thermal stress reduction and breaking elongation increase.
[0012] Therefore, the fiber produced before the xth second can increase the breaking elongation by reducing the wind speed generated by the cooling device outlet to the yarn, and the fiber produced before the 3rd second is affected by two factors, and the fiber produced between the 3rd and xth seconds is affected by only one factor, so the wind speed generated by the cooling device outlet to the yarn needs to be reduced more in the production process of the fiber produced before the 3rd second.
[0013] The present application finds through experiments that when the wind speed generated by the cooling device outlet to the yarn is adjusted to 88%a-92%a at the starting point of the POY cake winding process, the wind speed generated by the cooling device outlet to the yarn is adjusted to 93%a-97%a at the 3rd second, and the wind speed generated by the cooling device outlet to the yarn is a at the xth second, the difference between the fibers in different sections of the cake can be reduced, and the physical indexes of the whole fiber are more uniform.
[0014] Wherein, the speed of the spindle is increased 5-10s before the full winding head switching, and the wind speed generated by the cooling device outlet to the yarn has not been adjusted at this time, so the quality of the yarn between the cooling device and the winding head is poor, and the outermost layer of the cake will be wound, but in the subsequent stripping process, the surface yarn of the cake will be stripped, that is, the yarn will be stripped, so as to not affect the quality of the cake.
[0015] In the preparation of composite elastic spandex-covered yarn, the insufficient tightness of the spandex and polyester coating is due to the inconsistent quality of the bottom and outer layers of the yarn cake. The breaking elongation of the bottom layer is lower than that of the outer layer. The lower the breaking elongation, the greater the thermal stress. The greater the thermal stress, the stiffer the fiber feels (i.e., the greater the thermal stress, the tighter the fiber molecular chain structure and the higher the crystallinity, which increases the twisting tension above the false twister and the untwisting tension below the false twister, which is equivalent to increasing the tension of the fiber in the upper heating box. This makes it difficult for the fiber to stretch under stress during subsequent texturing, resulting in a still tight internal fiber structure and poor deformation effect. After untwisting, the elasticity and bulkiness become worse, hence the stiffer feel). Under the same process, the bottom layer and spandex cannot be bonded together, resulting in weak network points and phase separation of spandex and polyester. This invention overcomes the above problems by reducing the differences between different fiber segments in the yarn cake, making the physical properties of the entire fiber more uniform.
[0016] As a preferred technical solution:
[0017] The preparation method of the composite elastic spandex covered yarn as described above is as follows: the polyester POY passes through the pre-network, the first roller, the first heating box, the cooling plate and the false twister in sequence, and then is twisted with the spandex passing through the unwinding disc by the guide hook. Then it passes through the second roller, the networker, the second heating box, the guide, the third roller, oiling and winding in sequence to obtain the composite elastic spandex covered yarn.
[0018] The preparation method of the composite elastic spandex covered yarn as described above includes the following process parameters: texturing speed 500-750 m / min, draft ratio 1.6-1.72, ratio of linear velocity of the friction disc surface on the false twister to the linear velocity of the yarn leaving the friction disc (dy) 1.6-1.75, first heating box temperature 175-200℃, network pressure 0.28-0.35 MPa, networker aperture 1.4-1.6 mm, second heating box temperature 160-175℃, and oiling speed 1.4-1.8 rpm.
[0019] As described above, in the preparation method of composite elastic spandex covered yarn, a valve is provided at the inlet of the cooling device. By adjusting the valve, the air intake of the cooling device is controlled, thereby controlling the wind speed generated on the yarn bundle at the outlet of the cooling device. When the air intake decreases, the cross-sectional area of the cooling device outlet remains unchanged, the wind speed at the cooling device outlet decreases, and thus the wind speed on the yarn bundle decreases. When the air intake increases, the cross-sectional area of the cooling device outlet remains unchanged, the wind speed at the cooling device outlet increases, and thus the wind speed on the yarn bundle increases.
[0020] The preparation method of the composite elastic spandex covered yarn as described above, the valve is an electric valve; the device used in the preparation process of the polyester POY yarn further comprises a winding head, a winding head control cabinet, a control instrument and an electric valve adjustment control module;
[0021] The winding head and the winding head control cabinet are electrically connected, and the winding head control cabinet is used to control the winding head to wind the cake;
[0022] The winding head control cabinet is electrically connected with the control instrument, the control instrument is electrically connected with the electric valve adjustment control module, and the electric valve adjustment control module is electrically connected with the electric valve; the winding head control cabinet is used to send signals to the control instrument at the starting point, the third second and the xth second of the polyester POY yarn cake winding process, and the control instrument is used to receive the signals sent by the winding head control cabinet and control the opening of the electric valve, so that the wind speed generated by the cooling device outlet to the yarn at the starting point of the polyester POY yarn cake winding process is 88%a~92%a, the wind speed of the cooling device outlet at the third second is 93%a~97%a, and the wind speed generated by the cooling device outlet to the yarn at the xth second is a; wherein the signal sent by the winding head control cabinet is an analog model, and the electric valve adjustment control module is used to convert the analog signal sent by the winding head control cabinet into a micro-current electric signal that can be recognized by the electric valve.
[0023] The composite elastic spandex covered yarn prepared by the preparation method as described above, the specification of the polyester POY yarn is 125~355dtex / 36~96f; the polyester POY yarn wound in the 0~3 seconds of the winding process is denoted as polyester POY yarn I, the polyester POY yarn wound in the 3~x seconds of the winding process is denoted as polyester POY yarn II, and the polyester POY yarn wound after the xth second is denoted as polyester POY yarn III; the breaking elongation of the polyester POY yarn III is 122~130%, the deviation of the breaking elongation of the polyester POY yarn I and the polyester POY yarn III is ≤2.5%, and the deviation of the breaking elongation of the polyester POY yarn II and the polyester POY yarn III is ≤2%.
[0024] As a preferred technical solution:
[0025] The composite elastic spandex covered yarn prepared by the preparation method as described above, the network degree of the composite elastic spandex covered yarn formed by the polyester POY yarn wound in the 0~x seconds of the winding process and the spandex is 110~120 / m, and the network degree of the composite elastic spandex covered yarn formed by the polyester POY yarn III and the spandex is 110~120 / m; the crimp shrinkage of the composite elastic spandex covered yarn formed by the polyester POY yarn wound in the 0~x seconds of the winding process and the spandex is 65~71%, and the crimp stability is >98%; the crimp shrinkage of the composite elastic spandex covered yarn formed by the polyester POY yarn III and the spandex is 66~70%, and the crimp stability is >98%.
[0026] Beneficial effects:
[0027] (1) The preparation method of the composite elastic spandex covered yarn of the present application reduces the differences between fibers in different sections of the cake by adjusting the wind speed generated by the cooling device outlet at different times, making the physical indicators of the whole fiber more uniform, and solving the problem of phase separation of spandex and polyester in the cake; in the patent CN114150412A, the hot air with a temperature of 90-150℃ is sprayed from the network nozzle, and the higher temperature easily causes the nylon to stick to the tight point, thereby affecting the elasticity of the covered yarn, while the network nozzle of the present application does not use heating, so there is no problem of sticking to the tight point caused by deformation of POY due to heating.
[0028] (2) The composite elastic spandex covered yarn prepared by the preparation method of the present application is tightly combined when spandex and polyester are combined, and the prepared composite elastic spandex covered yarn has excellent elasticity. BRIEF DESCRIPTION OF DRAWINGS
[0029] Figure 1 The preparation device of the polyester POY yarn;
[0030] Among them, 1-electric valve, 2-electric valve adjustment and control module, 3-control instrument, 4-winding head, 5-winding head control cabinet. DETAILED DESCRIPTION
[0031] The present application will be further described in conjunction with specific embodiments. It should be understood that these embodiments are only used to illustrate the present application and not to limit the scope of the present application. In addition, it should be understood that after reading the content taught by the present application, those skilled in the art can make various modifications or modifications to the present application, and these equivalent forms also fall within the scope defined by the claims attached to the present application.
[0032] The performance indicators in the examples and comparative examples of the present application involve the following test methods:
[0033] Elongation at break: the polyester POY prepared in each example was used as a sample, and then the sample was measured by a full-automatic single yarn strength machine (model YG023B-III) according to the standard GB / T 14344-2022 "Chemical fiber filament tensile property test method", the specific process was as follows: first, the polyester fiber was placed in an environment with a temperature of 20℃ and a humidity of 65% for 4h, then it was clamped by upper and lower clamps (clamping length was 250mm), and a 0.05cN / dtex pre-tension was applied by a mechanical hand to stabilize the polyester fiber, when starting the test, the lower clamp stretched the yarn bundle at a speed of 1000mm / min, until the yarn bundle broke, at the same time, the real-time data of the force sensor during the stretching process was recorded, and the relationship curve between the strength and the elongation was drawn through the data collection system, finally, the elongation at break of the sample was obtained through data processing and analysis.
[0034] Network degree: According to the standard of "Synthetic fiber filament network degree test method" (FZ / T 50001-2016), the method D water bath needle moving method is used for testing.
[0035] Crimp shrinkage and crimp stability: According to the standard of "Synthetic fiber textured yarn crimp performance test method" (GB / T 6506-2017), a full-automatic filament crimp tester (model YG368-III) is used for testing.
[0036] Example 1
[0037] A preparation method of a composite elastic spandex covering yarn, the specific steps are as follows:
[0038] (1) Preparation process of polyester POY yarn:
[0039] The polyester melt is extruded through the spinneret, and then sequentially passes through cooling, oiling, first guide roller, pre-networking, second guide roller and winding to form a polyester POY yarn with a specification of 125 dtex / 36 f;
[0040] As shown in Figure 1 , a valve is arranged at the inlet of the cooling device, and the air inlet amount of the cooling device inlet is controlled by adjusting the valve, so as to control the air speed generated by the cooling device outlet to the yarn bundle;
[0041] The valve is an electric valve 1; The device used in the preparation process of the polyester POY yarn further includes a winding head 4, a winding head control cabinet 5, a control instrument 3 and an electric valve adjustment control module 2;
[0042] The winding head and the winding head control cabinet are electrically connected, and the winding head control cabinet is used to control the winding of the yarn cake by the winding head;
[0043] The winding head control cabinet is electrically connected with the control instrument, the control instrument is electrically connected with the electric valve adjustment control module, and the electric valve adjustment control module is electrically connected with the electric valve; The winding head control cabinet is used to send signals to the control instrument at the starting point, the 3rd second and the 30th second of the winding process of the polyester POY yarn cake, and the control instrument is used to receive the signals sent by the winding head control cabinet and control the opening of the electric valve;
[0044] In the preparation process of the polyester POY yarn, the set value of the air speed generated by the cooling device outlet to the yarn bundle is a, the air speed generated by the cooling device outlet to the yarn bundle is adjusted to 90% a at the starting point of the winding process of the polyester POY yarn cake, the air speed of the cooling device outlet is adjusted to 95% a at the 3rd second, and the air speed generated by the cooling device outlet to the yarn bundle is adjusted to a at the 30th second;
[0045] The process parameters in the preparation process of the polyester POY filament include that the inherent viscosity of the polyester POY filament raw material is 0.62 dL / g, the temperature of the spinning box is 285℃, the spinning plate assembly pressure is 18 MPa, the spinning hole diameter is 0.2 mm, the height of the windless zone is 40 mm, the cooling wind temperature is 20℃, a is 2.3 m / s, and the winding speed is 3000 m / min; the outer diameter of the paper tube is 125 mm, and the moving distance of the traversing mechanism is 125.5 mm;
[0046] The polyester POY filament wound in the 0-3 seconds in the winding process is denoted as polyester POY filament I, the polyester POY filament wound in the 3-30 seconds in the winding process is denoted as polyester POY filament II, and the polyester POY filament wound after 30 seconds is denoted as polyester POY filament III; the elongation at break of the polyester POY filament III is 122.7%, the deviation of the elongation at break of the polyester POY filament I and the polyester POY filament III is 2.1%, and the deviation of the elongation at break of the polyester POY filament II and the polyester POY filament III is 1.8%;
[0047] (2) The polyester POY filament sequentially passes through a pre-networking device, a first roller, a first heat box, a cooling plate and a false twister, is combined with a spandex through a guide hook and a spool, and then sequentially passes through a second roller, a networker, a second heat box, a guide device, a third roller, an oiling device and a winding device to obtain a composite spandex covered yarn;
[0048] In the process of the polyester POY filament, the spandex is combined between the false twister and the second roller, and sequentially passes through the second roller, the networker, the second heat box, the guide device, the third roller, the oiling device and the winding device to obtain the composite spandex covered yarn; wherein the spandex is a core yarn.
[0049] The process parameters include that the false-twisting speed is 500 m / min, the draft ratio is 1.6, the ratio of the surface linear speed of the friction disc of the false twister to the linear speed of the yarn leaving the friction disc is 1.75, the temperature of the first heat box is 175℃, the network pressure is 0.28 MPa, the networker hole diameter is 1.4 mm, the temperature of the second heat box is 160℃, and the oiling speed is 1.4 rpm.
[0050] The network degree of the composite spandex covered yarn formed by the polyester POY filament wound in the 0-30 seconds in the winding process and the spandex is 112 / m, and the network degree of the composite spandex covered yarn formed by the polyester POY filament III and the spandex is 113 / m; the crimping shrinkage of the composite spandex covered yarn formed by the polyester POY filament wound in the 0-30 seconds in the winding process and the spandex is 68.4%, and the crimping stability is 98.6%; the crimping shrinkage of the composite spandex covered yarn formed by the polyester POY filament III and the spandex is 68.1%, and the crimping stability is 99%.
[0051] Example 2
[0052] A preparation method of a composite elastic spandex covering yarn, the specific steps are as follows:
[0053] (1) The preparation process of the polyester POY yarn:
[0054] The polyester melt is extruded through the spinneret, and then sequentially passes through cooling, oiling, first guide roller, pre-networking, second guide roller and winding to form a polyester POY yarn with a specification of 155 dtex / 36 f;
[0055] A valve is arranged at the inlet of the cooling device, and the air inlet amount of the cooling device inlet is controlled by adjusting the valve, so as to control the wind speed generated by the cooling device outlet to the yarn bundle;
[0056] The valve is an electric valve; the device used in the preparation process of the polyester POY yarn also includes a winding head, a winding head control cabinet, a control instrument and an electric valve adjustment control module;
[0057] The winding head and the winding head control cabinet are electrically connected, and the winding head control cabinet is used to control the winding of the yarn cake by the winding head;
[0058] The winding head control cabinet is electrically connected with the control instrument, the control instrument is electrically connected with the electric valve adjustment control module, and the electric valve adjustment control module is electrically connected with the electric valve; the winding head control cabinet is used to send signals to the control instrument at the starting point, the 3rd second and the 28th second of the winding process of the polyester POY yarn cake, and the control instrument is used to receive the signals sent by the winding head control cabinet and control the opening of the electric valve;
[0059] In the preparation process of the polyester POY yarn, the set value of the wind speed generated by the cooling device outlet to the yarn bundle is a, the wind speed generated by the cooling device outlet to the yarn bundle is adjusted to 89%a at the starting point of the winding process of the polyester POY yarn cake, the wind speed of the cooling device outlet is adjusted to 94%a at the 3rd second, and the wind speed generated by the cooling device outlet to the yarn bundle is adjusted to a at the 28th second;
[0060] The process parameters in the preparation process of the polyester POY yarn include: the intrinsic viscosity of the polyester POY yarn raw material is 0.625 dL / g, the temperature of the spinning box is 289℃, the pressure of the spinneret assembly is 16 MPa, the spinneret hole diameter is 0.21 mm, the height of the windless zone is 50 mm, the cooling wind temperature is 21℃, a is 2.4 m / s, and the winding speed is 3060 m / min; the outer diameter of the paper tube is 125 mm, and the moving distance of the traversing mechanism is 125.3 mm;
[0061] The polyester POY yarns wound in the 0-3 seconds of the winding process are denoted as polyester POY yarn I, the polyester POY yarns wound in the 3-28 seconds of the winding process are denoted as polyester POY yarn II, and the polyester POY yarns wound after the 28 seconds are denoted as polyester POY yarn III. The elongation at break of the polyester POY yarn III is 124.1%, the deviation of the elongation at break of the polyester POY yarn I and the polyester POY yarn III is 2.3%, and the deviation of the elongation at break of the polyester POY yarn II and the polyester POY yarn III is 1.6%.
[0062] (2) The polyester POY yarns sequentially pass through a pre-networking device, a first roller, a first heat box, a cooling plate and a false twister, are combined with the spandex yarns passing through a yarn unwinding disc through a yarn guide hook, and then sequentially pass through a second roller, a networker, a second heat box, a yarn guide, a third roller, oiling and winding to obtain the composite elastic spandex covered yarn.
[0063] In the process of the polyester POY yarns, the spandex yarns are combined between the false twister and the second roller, and sequentially pass through the second roller, the networker, the second heat box, the yarn guide, the third roller, the oiling and the winding to obtain the composite elastic spandex covered yarn. The spandex yarns are the core yarns.
[0064] The process parameters include: the elasticizing speed of 730 m / min, the draft ratio of 1.71, the ratio of the surface linear speed of the friction disc of the false twister to the linear speed of the yarn bundle leaving the friction disc of 1.6, the temperature of the first heat box of 180°C, the network pressure of 0.29 MPa, the networker aperture of 1.45 mm, the temperature of the second heat box of 162°C, and the oiling speed of 1.45 rpm.
[0065] The network degree of the composite elastic spandex covered yarn formed by the polyester POY yarns wound in the 0-28 seconds of the winding process and the spandex yarns is 110 / m, and the network degree of the composite elastic spandex covered yarn formed by the polyester POY yarn III and the spandex yarns is 112 / m. The crimping shrinkage of the composite elastic spandex covered yarn formed by the polyester POY yarns wound in the 0-28 seconds of the winding process and the spandex yarns is 67.6%, and the crimping stability is 98.1%. The crimping shrinkage of the composite elastic spandex covered yarn formed by the polyester POY yarn III and the spandex yarns is 67.9%, and the crimping stability is 99.2%.
[0066] Example 3
[0067] A preparation method of a composite elastic spandex covered yarn, and the specific steps are as follows:
[0068] (1) The preparation process of the polyester POY yarns:
[0069] The polyester melt extruded through the spinneret passes through cooling, oiling, a first guide roller, pre-networking, a second guide roller and winding in sequence to form the polyester POY yarns with a specification of 260 dtex / 48 f.
[0070] The cooling device is provided with a valve at the inlet, and the air inlet amount of the cooling device inlet is controlled by adjusting the valve, and then the air speed generated by the cooling device outlet to the filament is controlled;
[0071] The valve is an electric valve; the device used in the preparation process of the polyester POY filament further comprises a winding head, a winding head control cabinet, a control instrument and an electric valve adjustment control module;
[0072] The winding head and the winding head control cabinet are electrically connected, and the winding head control cabinet is used to control the winding of the filament cake by the winding head;
[0073] The winding head control cabinet is electrically connected with the control instrument, the control instrument is electrically connected with the electric valve adjustment control module, and the electric valve adjustment control module is electrically connected with the electric valve; the winding head control cabinet is used to send signals to the control instrument at the starting point, the 3rd second and the 27th second of the winding process of the polyester POY filament cake, and the control instrument is used to receive the signals sent by the winding head control cabinet and control the opening of the electric valve;
[0074] In the preparation process of the polyester POY filament, the set value of the air speed generated by the cooling device outlet to the filament is a, the air speed generated by the cooling device outlet to the filament is 88%a at the starting point of the winding process of the polyester POY filament cake, the air speed of the cooling device outlet is 93%a at the 3rd second, and the air speed generated by the cooling device outlet to the filament is a at the 27th second;
[0075] The process parameters in the preparation process of the polyester POY filament include that the intrinsic viscosity of the polyester POY filament raw material is 0.63 dL / g, the temperature of the spinning beam is 287℃, the pressure of the spinneret assembly is 17 MPa, the spinneret hole diameter is 0.22 mm, the height of the windless zone is 60 mm, the cooling air temperature is 22℃, a is 2.5 m / s, and the winding speed is 3100 m / min; the outer diameter of the paper tube is 124 mm, and the moving distance of the traversing mechanism is 125 mm;
[0076] The polyester POY filament wound in the 0th-3rd second of the winding process is denoted as polyester POY filament I, the polyester POY filament wound in the 3rd-27th second of the winding process is denoted as polyester POY filament II, and the polyester POY filament wound after the 27th second is denoted as polyester POY filament III; the elongation at break of the polyester POY filament III is 126.4%, the deviation of the elongation at break of the polyester POY filament I and the polyester POY filament III is 2.5%, and the deviation of the elongation at break of the polyester POY filament II and the polyester POY filament III is 2%;
[0077] (2) the polyester POY yarn passes through the pre-networking device, the first roller, the first heat box, the cooling plate and the false twister in sequence, is combined with the spandex through the guide hook and the unwinding disc, and then passes through the second roller, the networker, the second heat box, the guide, the third roller, the oiling device and the winding device in sequence to prepare the composite spandex covered yarn with elasticity;
[0078] the spandex is combined with the polyester POY yarn between the false twister and the second roller in the process of the polyester POY yarn, and then passes through the second roller, the networker, the second heat box, the guide, the third roller, the oiling device and the winding device in sequence to prepare the composite spandex covered yarn with elasticity; wherein the spandex is the core yarn;
[0079] the process parameters include: the elasticizing speed is 600 m / min, the draft ratio is 1.65, the ratio of the surface linear speed of the friction disc on the false twister to the linear speed of the yarn leaving the friction disc is 1.65, the temperature of the first heat box is 185℃, the network pressure is 0.3 MPa, the networker aperture is 1.5 mm, the temperature of the second heat box is 165℃, and the oiling speed is 1.5 rpm.
[0080] the network degree of the composite spandex covered yarn with elasticity formed by the polyester POY yarn and the spandex wound in the 0th-27th second in the winding process is 115 / m, and the network degree of the composite spandex covered yarn with elasticity formed by the polyester POY yarn III and the spandex is 116 / m; the crimping shrinkage of the composite spandex covered yarn with elasticity formed by the polyester POY yarn and the spandex wound in the 0th-27th second in the winding process is 70.5%, and the crimping stability is 99.2%; the crimping shrinkage of the composite spandex covered yarn with elasticity formed by the polyester POY yarn III and the spandex is 69.8%, and the crimping stability is 99.7%.
[0081] Embodiment 4
[0082] A preparation method of a composite spandex covered yarn with elasticity, and the specific steps are as follows:
[0083] (1) the preparation process of the polyester POY yarn:
[0084] the polyester melt extruded through the spinneret passes through the cooling device, the oiling device, the first guide roller, the pre-networking device, the second guide roller and the winding device in sequence to prepare the polyester POY yarn with a specification of 178 dtex / 96 f;
[0085] a valve is arranged at the inlet of the cooling device, and the air inlet of the cooling device is controlled by adjusting the valve, so as to control the air speed generated by the outlet of the cooling device on the yarn;
[0086] the valve is an electric valve; the device used in the preparation process of the polyester POY yarn further includes a winding head, a winding head control cabinet, control instruments and an electric valve adjustment control module;
[0087] the winding head and the winding head control cabinet are electrically connected, and the winding head control cabinet is used to control the winding head to wind the yarn cake.
[0088] The winding head control cabinet is electrically connected with the control instrument, the control instrument is electrically connected with the electric valve adjusting control module, and the electric valve adjusting control module is electrically connected with the electric valve; the winding head control cabinet is used for sending signals to the control instrument at the starting point, the third second and the 28th second of the polyester POY cake winding process, and the control instrument is used for receiving the signals sent by the winding head control cabinet and controlling the opening of the electric valve;
[0089] In the preparation process of the polyester POY yarn, the set value of the wind speed generated by the cooling device outlet to the yarn bundle is a, the wind speed generated by the cooling device outlet to the yarn bundle is adjusted to 92%a at the starting point of the winding process of the polyester POY cake, the wind speed of the cooling device outlet is adjusted to 97%a at the third second, and the wind speed generated by the cooling device outlet to the yarn bundle is adjusted to a at the 28th second;
[0090] The process parameters in the preparation process of the polyester POY yarn include that the intrinsic viscosity of the polyester POY yarn raw material is 0.633 dL / g, the temperature of the spinning box is 290 DEG C, the jet plate assembly pressure is 18 MPa, the jet hole diameter is 0.23 mm, the height of the windless zone is 45 mm, the cooling wind temperature is 20 DEG C, a is 2.1 m / s, and the winding speed is 2980 m / min; the outer diameter of the paper tube is 125 mm, and the moving distance of the traversing mechanism is 125 mm;
[0091] The polyester POY yarns wound in the 0th-3rd second of the winding process are denoted as polyester POY yarn I, the polyester POY yarns wound in the 3rd-28th second of the winding process are denoted as polyester POY yarn II, and the polyester POY yarns wound after the 28th second are denoted as polyester POY yarn III; the breaking elongation of the polyester POY yarn III is 129.3%, the deviation of the breaking elongation of the polyester POY yarn I and the polyester POY yarn III is 2.2%, and the deviation of the breaking elongation of the polyester POY yarn II and the polyester POY yarn III is 1.8%;
[0092] (2) The polyester POY yarn sequentially passes through a pre-networking device, a first roller, a first heat box, a cooling plate and a false twister, is combined with a spandex yarn through a guide hook and an unwinding disc, and then sequentially passes through a second roller, a networker, a second heat box, a guide device, a third roller, oiling and winding to obtain a composite elastic spandex covered yarn;
[0093] In the process of the polyester POY yarn, the spandex yarn is combined between the false twister and the second roller, and sequentially passes through the second roller, the networker, the second heat box, the guide device, the third roller, the oiling and the winding to obtain the composite elastic spandex covered yarn; wherein the spandex yarn is a core yarn;
[0094] The process parameters include: elasticizing speed 690 m / min, draft ratio 1.68, ratio of the surface line speed of the friction disc on the false twister to the line speed of the yarn leaving the friction disc 1.67, first heat box temperature 190℃, network pressure 0.32 MPa, network disc aperture 1.55 mm, second heat box temperature 168℃, and oiling speed 1.6 rpm.
[0095] The network degree of the composite elastic spandex covered yarn formed by the polyester POY yarn and the spandex in the 0-28 seconds of the winding process is 116 / m, and the network degree of the composite elastic spandex covered yarn formed by the polyester POY yarn III and the spandex is 116 / m; the crimping shrinkage of the composite elastic spandex covered yarn formed by the polyester POY yarn and the spandex in the 0-28 seconds of the winding process is 65.1%, and the crimping stability is 98.6%; the crimping shrinkage of the composite elastic spandex covered yarn formed by the polyester POY yarn III and the spandex is 66%, and the crimping stability is 98.9%.
[0096] Example 5
[0097] A preparation method of a composite elastic spandex covered yarn, and the specific steps are as follows:
[0098] (1) Preparation process of the polyester POY yarn:
[0099] The polyester melt is extruded through the spinneret, and then sequentially passes through a cooling device, an oiling device, a first guide roller, a pre-networking device, a second guide roller, and a winding device to form a polyester POY yarn with a specification of 196 dtex / 96 f;
[0100] A valve is arranged at the inlet of the cooling device, and the air inlet amount of the cooling device inlet is controlled by adjusting the valve, so as to control the air speed generated by the outlet of the cooling device on the yarn;
[0101] The valve is an electric valve; the device used in the preparation process of the polyester POY yarn further comprises a winding head, a winding head control cabinet, a control instrument, and an electric valve adjustment and control module;
[0102] The winding head and the winding head control cabinet are electrically connected, and the winding head control cabinet is used to control the winding of the yarn cake by the winding head;
[0103] The winding head control cabinet is electrically connected with the control instrument, the control instrument is electrically connected with the electric valve adjustment and control module, and the electric valve adjustment and control module is electrically connected with the electric valve; the winding head control cabinet is used to send signals to the control instrument at the starting point, the third second, and the 29th second of the winding process of the polyester POY yarn cake, and the control instrument is used to receive the signals sent by the winding head control cabinet and control the opening of the electric valve;
[0104] In the preparation process of the polyester POY yarn, the set value of the air speed generated by the cooling device outlet to the yarn bundle when producing the polyester POY yarn is a, the air speed generated by the cooling device outlet to the yarn bundle is adjusted to 91%a at the starting point of the winding process of the polyester POY cake, the air speed of the cooling device outlet is adjusted to 96%a at the third second, and the air speed generated by the cooling device outlet to the yarn bundle is adjusted to a at the 29th second;
[0105] The process parameters in the preparation process of the polyester POY yarn include that the intrinsic viscosity of the polyester POY yarn raw material is 0.635 dL / g, the temperature of the spinning beam is 288℃, the jet plate assembly pressure is 17.5 MPa, the jet hole diameter is 0.24 mm, the height of the windless zone is 55 mm, the cooling wind temperature is 22℃, a is 2.3 m / s, and the winding speed is 2860 m / min; the outer diameter of the paper tube is 125 mm, and the moving distance of the traversing mechanism is 124.7 mm.
[0106] The polyester POY yarn wound in the 0th-3rd second in the winding process is denoted as polyester POY yarn I, the polyester POY yarn wound in the 3rd-29th second in the winding process is denoted as polyester POY yarn II, and the polyester POY yarn wound after the 29th second is denoted as polyester POY yarn III; the elongation at break of the polyester POY yarn III is 128.5%, the deviation of the elongation at break of the polyester POY yarn I and the polyester POY yarn III is 2.3%, and the deviation of the elongation at break of the polyester POY yarn II and the polyester POY yarn III is 1.9%.
[0107] (2) The polyester POY yarn successively passes through a pre-networking device, a first roller, a first heat box, a cooling plate and a false twister, is combined with spandex through a guide hook and an unwinding disc, and then successively passes through a second roller, a networker, a second heat box, a guide, a third roller, oiling and winding to obtain a composite elastic spandex covered yarn.
[0108] In the process of the polyester POY yarn, the spandex is combined between the false twister and the second roller, and successively passes through the second roller, the networker, the second heat box, the guide, the third roller, the oiling and the winding to obtain the composite elastic spandex covered yarn; wherein the spandex is a core yarn.
[0109] The process parameters include that the elasticizing speed is 700 m / min, the draft ratio is 1.7, the ratio of the surface linear speed of the friction disc of the false twister to the linear speed of the yarn bundle leaving the friction disc is 1.7, the first heat box temperature is 195℃, the network pressure is 0.34 MPa, the networker hole diameter is 1.6 mm, the second heat box temperature is 170℃, and the oiling speed is 1.7 rpm.
[0110] The network degree of the composite elastic spandex covered yarn formed by the polyester POY yarn and spandex wound in the 0-29 seconds of the winding process is 118 / m, and the network degree of the composite elastic spandex covered yarn formed by the polyester POY yarn III and spandex is 118 / m; the crimping shrinkage of the composite elastic spandex covered yarn formed by the polyester POY yarn and spandex wound in the 0-29 seconds of the winding process is 66.1%, and the crimping stability is 98.4%; the crimping shrinkage of the composite elastic spandex covered yarn formed by the polyester POY yarn III and spandex is 66.8%, and the crimping stability is 99.1%.
[0111] Example 6
[0112] A preparation method of a composite elastic spandex covered yarn, and the specific steps are as follows:
[0113] (1) The preparation process of the polyester POY yarn:
[0114] The polyester melt is extruded through the spinneret, and then sequentially passes through a cooling device, an oiling device, a first guide roller, a pre-networking device, a second guide roller, and a winding device to form a polyester POY yarn with a specification of 355 dtex / 96 f;
[0115] A valve is arranged at the inlet of the cooling device, and the air inlet amount of the cooling device inlet is controlled by adjusting the valve, so as to control the air speed generated by the cooling device outlet to the yarn;
[0116] The valve is an electric valve; the device used in the preparation process of the polyester POY yarn further comprises a winding head, a winding head control cabinet, a control instrument, and an electric valve adjustment and control module;
[0117] The winding head and the winding head control cabinet are electrically connected, and the winding head control cabinet is used to control the winding of the yarn cake by the winding head;
[0118] The winding head control cabinet is electrically connected with the control instrument, the control instrument is electrically connected with the electric valve adjustment and control module, and the electric valve adjustment and control module is electrically connected with the electric valve; the winding head control cabinet is used to send signals to the control instrument at the starting point, the third second, and the 28th second of the winding process of the polyester POY yarn cake, and the control instrument is used to receive the signals sent by the winding head control cabinet and control the opening of the electric valve;
[0119] In the preparation process of the polyester POY yarn, the set value of the air speed generated by the cooling device outlet to the yarn is a, the air speed generated by the cooling device outlet to the yarn is adjusted to 90%a at the starting point of the winding process of the polyester POY yarn cake, the air speed of the cooling device outlet is adjusted to 95%a at the third second, and the air speed generated by the cooling device outlet to the yarn is adjusted to a at the 28th second;
[0120] The process parameters in the preparation process of the polyester POY filament include that the inherent viscosity of the polyester POY filament raw material is 0.631 dL / g, the temperature of the spinning box is 285℃, the spinneret assembly pressure is 15 MPa, the spinneret aperture is 0.25 mm, the height of the windless zone is 50 mm, the cooling wind temperature is 21℃, a is 2.4 m / s, and the winding speed is 2800 m / min; the outer diameter of the paper tube is 124 mm, and the moving distance of the traversing mechanism is 124.5 mm;
[0121] The polyester POY filament wound in the 0-3 seconds in the winding process is denoted as polyester POY filament I, the polyester POY filament wound in the 3-28 seconds in the winding process is denoted as polyester POY filament II, and the polyester POY filament wound after 28 seconds is denoted as polyester POY filament III; the elongation at break of the polyester POY filament III is 124.6%, the deviation of the elongation at break of the polyester POY filament I and the polyester POY filament III is 2.5%, and the deviation of the elongation at break of the polyester POY filament II and the polyester POY filament III is 1.9%;
[0122] (2) The polyester POY filament sequentially passes through a pre-networking device, a first roller, a first heat box, a cooling plate and a false twister, is combined with a spandex through a guide hook and a spool, and then sequentially passes through a second roller, a networker, a second heat box, a guide device, a third roller, oiling and winding to obtain a composite elastic spandex covered yarn;
[0123] In the process of the polyester POY filament, the spandex is combined between the false twister and the second roller, and sequentially passes through the second roller, the networker, the second heat box, the guide device, the third roller, the oiling and the winding to obtain the composite elastic spandex covered yarn; wherein the spandex is a core yarn;
[0124] The process parameters include that the elasticizing speed is 750 m / min, the draft ratio is 1.72, the ratio of the surface linear speed of the friction disc of the false twister to the linear speed of the yarn leaving the friction disc is 1.69, the temperature of the first heat box is 200℃, the network pressure is 0.35 MPa, the networker aperture is 1.5 mm, the temperature of the second heat box is 175℃, and the oiling speed is 1.8 rpm.
[0125] The network degree of the composite elastic spandex covered yarn formed by the polyester POY filament wound in the 0-28 seconds in the winding process and the spandex is 120 / m, and the network degree of the composite elastic spandex covered yarn formed by the polyester POY filament III and the spandex is 120 / m; the crimping shrinkage of the composite elastic spandex covered yarn formed by the polyester POY filament wound in the 0-28 seconds in the winding process and the spandex is 66.3%, and the crimping stability is 98.3%; the crimping shrinkage of the composite elastic spandex covered yarn formed by the polyester POY filament III and the spandex is 67%, and the crimping stability is 98.9%.
Claims
1. A method for preparing a composite stretch-covered yarn, comprising the steps of: splicing the spandex yarn between the false twister and the second roller during the stretch process of the polyester POY yarn, and sequentially passing through the second roller, the netter, the second heat box, the guide, the third roller, the oiling and the winding to obtain the composite stretch-covered yarn; wherein, The core yarn is spandex. The characteristic feature is that, during the preparation of polyester POY yarn, the set value of the wind speed generated by the cooling device outlet on the yarn bundle during the production of polyester POY yarn is set to 'a'. At the starting point of the winding process of the polyester POY yarn cake, the wind speed generated by the cooling device outlet on the yarn bundle is adjusted to 88%a to 92%a. At the 3rd second, the wind speed at the cooling device outlet is adjusted to 93%a to 97%a. At the xth second, the wind speed generated by the cooling device outlet on the yarn bundle is adjusted to 'a'. The xth second refers to the moment when the yarn has been wound on the paper tube for 1306 to 1500 m. The process parameters for preparing polyester POY yarn include: the intrinsic viscosity of the polyester POY yarn raw material is 0.620~0.635dL / g, the temperature of the spinning box is 285~290℃, the pressure of the spinneret assembly is 15~18MPa, the spinneret orifice diameter is 0.2~0.25mm, the height of the windless zone is 40~60mm, the cooling air temperature is 20~22℃, a is 2.1~2.5m / s, and the winding speed is 2800~3100m / min.
2. The method for preparing a composite elastic spandex-coated yarn according to claim 1, characterized in that, The specific preparation process of composite elastic spandex covered yarn is as follows: after polyester POY passes through the pre-network, first roller, first hot box, cooling plate and false twister in sequence, it is twisted with spandex passing through the unwinding disc by the guide hook, and then passes through the second roller, networker, second hot box, guideer, third roller, oiling and winding in sequence to obtain composite elastic spandex covered yarn.
3. The method for preparing a composite elastic spandex-coated yarn according to claim 2, characterized in that, The process parameters for composite elastic spandex covered yarn include: texturing speed 500-750 m / min, draft ratio 1.6-1.72, ratio of linear velocity of the friction disc surface on the false twister to linear velocity of the yarn leaving the friction disc 1.6-1.75, first heating box temperature 175-200℃, network pressure 0.28-0.35 MPa, networker aperture 1.4-1.6 mm, second heating box temperature 160-175℃, and oiling speed 1.4-1.8 rpm.
4. The method for preparing a composite elastic spandex-coated yarn according to claim 1, characterized in that, A valve is installed at the inlet of the cooling device. By adjusting the valve, the air intake of the cooling device can be controlled, which in turn controls the wind speed generated by the cooling device outlet on the filament bundle.
5. The method for preparing a composite elastic spandex-coated yarn according to claim 4, characterized in that, The valve is an electric valve; the equipment used in the preparation process of polyester POY yarn also includes a winding head, a winding head control cabinet, control instruments, and an electric valve adjustment and control module; The winding head and the winding head control cabinet are electrically connected. The winding head control cabinet is used to control the winding head to wind the yarn cake. The winding head control cabinet is electrically connected to the control instrument, the control instrument is electrically connected to the electric valve regulating control module, and the electric valve regulating control module is electrically connected to the electric valve. The winding head control cabinet is used to send signals to the control instrument at the start point, the 3rd second, and the xth second of the polyester POY yarn cake winding process. The control instrument is used to receive the signals sent by the winding head control cabinet and control the opening degree of the electric valve.
6. The composite elastic spandex-coated yarn prepared by the preparation method according to any one of claims 1 to 5, characterized in that, The specifications of polyester POY yarn are 125~355dtex / 36~96f; the polyester POY yarn wound in the first 0-3 seconds of the winding process is designated as polyester POY yarn I, the polyester POY yarn wound in the first 3-x seconds of the winding process is designated as polyester POY yarn II, and the polyester POY yarn wound after x seconds is designated as polyester POY yarn III. The breaking elongation of polyester POY yarn III is 122-130%, the deviation of the breaking elongation of polyester POY yarn I from that of polyester POY yarn III is ≤2.5%, and the deviation of the breaking elongation of polyester POY yarn II from that of polyester POY yarn III is ≤2%.
7. The composite elastic spandex-coated yarn prepared by the method according to claim 6, characterized in that, The network density of the composite elastic spandex-covered yarn formed by the polyester POY yarn and spandex during the winding process from 0 to x seconds is 110 to 120 yarns / meter, and the network density of the composite elastic spandex-covered yarn formed by polyester POY yarn III and spandex is 110 to 120 yarns / meter. The crimp shrinkage rate of the composite elastic spandex-covered yarn formed by the polyester POY yarn and spandex during the winding process from 0 to x seconds is 65 to 71%, and the crimp stability is >98%. The crimp shrinkage rate of the composite elastic spandex-covered yarn formed by polyester POY yarn III and spandex is 66 to 70%, and the crimp stability is >98%.