A production method for stabilizing the orientation of polyester industrial yarn

Abstract

The invention belongs to the technical field of polyester industrial yarns, and relates to a production method for stabilizing the orientation of polyester industrial yarns. The method comprises the following steps: oiling the spun yarn bundles, and then drawing and shaping them through five pairs of drawing rollers, and winding them to obtain polyester industrial yarns, wherein the fineness of the polyester industrial yarns is not less than 840D; all the drawing rollers along the running direction of the yarn bundles are respectively recorded as one roller, two rollers, three rollers, four rollers, five rollers, six rollers, seven rollers, eight rollers, nine rollers, and ten rollers; along the length direction, the five rollers include seven heating zones of equal length, which are one zone, two zones, three zones, four zones, five zones, six zones, and seven zones in sequence from the free end to the other end; during the drawing and shaping process, the temperature of one zone on the five rollers is controlled to exceed the set temperature of the five rollers by 15-25°C, and the temperature of the two zones is controlled to exceed the set temperature of the five rollers by 5-10°C. The invention regulates the temperature of the first zone and the second zone on the five rollers by a control system, thereby ensuring that the yarn bundles are heated normally on the hot rollers, thereby ensuring the stability of the quality of the polyester industrial yarns.

Description

Technical Field

[0001] The invention belongs to the technical field of polyester industrial yarns and relates to a production method for stabilizing the orientation of polyester industrial yarns. Background Art

[0002] In the production process of polyester industrial yarn, polyester industrial yarn needs to be stretched, heat-set and other processes to produce high-strength polyester industrial yarn. In this process, the polyester macromolecular chain will move more rapidly due to heat, and the molecular chain will curl in a disordered manner. When the polyester macromolecular chain is stretched, the molecular chain will be straightened, and the molecular chain will be relatively regularly arranged to form an orientation.

[0003] At present, in the actual process, the existing technology will affect the drawing and heating changes of the tow on the hot roller due to the coking of the hot roller oil agent and the periodic washing of the roller, so that the polyester industrial yarn will have color difference due to whiteness becoming white or dark, poor orientation of the polyester polymer chain and other problems. In order to ensure the high strength and quality stability of the produced polyester industrial yarn, it is necessary to ensure that the polyester polymer is heated normally during the drawing and heating process, so that the orientation of the polyester polymer chain is stable.

[0004] Therefore, a production method for stabilizing the orientation of polyester industrial yarn is needed to solve the above problems, which is of great significance. Summary of the invention

[0005] The purpose of the present invention is to solve the problems existing in the prior art and provide a production method for stabilizing the orientation of polyester industrial yarns.

[0006] To achieve the above object, the technical solution adopted by the present invention is as follows:

[0007] A production method for stabilizing the orientation of polyester industrial yarns. The yarn bundles obtained by spinning are oiled, stretched and shaped by five pairs of drafting rollers, and then wound to obtain polyester industrial yarns. All the drafting rollers along the running direction of the yarn bundles are respectively recorded as roller one, roller two, roller three, roller four, roller five, roller six, roller seven, roller eight, roller nine, and roller ten. The fineness of the polyester industrial yarn is not less than 840D (the core of the present invention is to control the over-temperature of the first and second zones of the five rollers within a certain range to achieve the purpose of stabilizing the orientation of the polyester industrial yarns during the production process. If the fineness of the polyester industrial yarns is too small, the heat carried is not enough to make the hot rollers obviously overheated); along the length direction of the five rollers, the five rollers include seven heating zones of equal length, which are zone one, zone two, zone three, zone four, zone five, zone six, and zone seven from the free end to the other end; during the stretching and shaping process, the temperature of zone one on the five rollers is controlled to exceed the set temperature of the five rollers by 15-25°C, and the temperature of zone two exceeds the set temperature of the five rollers by 5-10°C;

[0008] The allowable temperature range of the first and second zones on the five rollers is set, and the temperature of the first and second zones is respectively monitored in real time by temperature sensors. When the temperature of the first and / or second zones exceeds the set allowable temperature range, the temperature of the first and / or second zones is changed by adjusting the speed of the fifth and sixth rollers.

[0009] As the preferred technical solution:

[0010] In the production method for stabilizing the orientation of polyester industrial yarn as described above, the yarn bundle is wound around each pair of rollers for 3 to 6 turns.

[0011] The present invention monitors and automatically controls the over-temperature of the first and second zones of the five-roller. When the over-temperature of the first and second zones of the five-roller becomes smaller, the control system transmits the information to the computer end, and the computer end transmits the information to the fifth and sixth hot rollers to reduce the speed of the fifth and sixth rollers. After the speed of the fifth and sixth rollers is reduced, the temperature of the first and second zones of the five-roller will increase. In this way, by monitoring the temperature of the first and second zones of the five-roller, the speed of the fifth and sixth rollers is automatically adjusted, so that the temperature of the first and second zones of the five-roller is increased, the temperature of the first and second zones of the five-roller is kept stable, and the product quality fluctuation caused is avoided.

[0012] The speed adjustment of the fifth and sixth rollers keeps the temperature of the first and second zones of the five rollers basically stable. The change in the speed of the fifth and sixth rollers will only change the first and second step drafting ratios, while the total drafting ratio will not change (first step drafting ratio = third pair of rollers speed / first pair of rollers speed, two-step drafting ratio = fourth pair of rollers speed / third pair of rollers speed, total drafting ratio = fourth pair of rollers speed / first pair of rollers speed), which will not affect the strength of the polyester industrial yarn.

[0013] The production method for stabilizing the orientation of polyester industrial yarn as described above, wherein the specifications of the polyester industrial yarn are 930dtex / 192f, 1100dtex / 192f or 3300~3400dtex / 384f.

[0014] According to the production method for stabilizing the orientation of polyester industrial yarn, when the specification of the polyester industrial yarn is 930dtex / 192f, during the drafting and shaping process, the temperatures and speeds of the five pairs of drafting rollers are as follows: the speed of the first pair of rollers (i.e., the first and second rollers) is 480-490m / min, and the temperature is 60-65°C; the speed of the second pair of rollers (i.e., the third and fourth rollers) is 490-500m / min, and the temperature is 95-100°C; the speed of the third pair of rollers (i.e., the fifth and sixth rollers) is 1850-1900m / min, and the temperature is 130-140°C; the speed of the fourth pair of rollers (i.e., the seventh and eighth rollers) is 2800-2900m / min, and the temperature is 220-230°C; the speed of the fifth pair of rollers (i.e., the ninth and tenth rollers) is 2800-2850m / min, and the temperature is 140-160°C;

[0015] When the specification of polyester industrial yarn is 1100dtex / 192f, during the drafting and setting process, the temperature and speed of the five pairs of drafting rollers are as follows: the speed of the first pair of rollers is 470~480m / min, the temperature is 60~65℃; the speed of the second pair of rollers is 480~490m / min, the temperature is 95~100℃; the speed of the third pair of rollers is 1850~1900m / min, the temperature is 130~140℃; the speed of the fourth pair of rollers is 2800~2900m / min, the temperature is 220~230℃; the speed of the fifth pair of rollers is 2800~2850m / min, the temperature is 140~160℃;

[0016] When the specification of polyester industrial yarn is 3300~3400dtex / 384f, during the stretching and shaping process, the temperature and speed of the five pairs of stretching rollers are: the speed of the first pair of rollers is 460~470m / min, the temperature is 60~65℃; the speed of the second pair of rollers is 470~480m / min, the temperature is 95~100℃; the speed of the third pair of rollers is 1850~1900m / min, the temperature is 130~140℃; the speed of the fourth pair of rollers is 2800~2900m / min, the temperature is 220~230℃; the speed of the fifth pair of rollers is 2800~2850m / min, the temperature is 140~160℃.

[0017] The above-mentioned production method for stabilizing the orientation of polyester industrial yarn has a winding speed of 2680~2720m / min.

[0018] In the production method for stabilizing the orientation of polyester industrial yarn as described above, during the drawing and shaping process, the temperature of the first zone on the five rollers is controlled in the range of 145-165°C, and the temperature of the second zone is controlled in the range of 135-150°C.

[0019] Principle of the invention:

[0020] One-step drafting is from one or two rollers to five or six rollers, and five rollers are the end of one-step drafting. Two-step drafting is from five or six rollers to seven or eight rollers, and five rollers are the beginning of two-step drafting, so five rollers play a linking role in one or two-step drafting. The tow is wound around the hot roller for multiple turns to improve the heating effect of the tow and the hot roller. Generally, 16 heads are spun, and the tow is wound around each hot roller for 4 to 5 turns. If the number of turns of the tow roller is sorted from the free end to the end of the hot roller, the one or two turns of the tow on the five rollers are in the one or two zones of the five rollers, and the one or two zones of the five rollers are exactly the key points in the key hot rollers, and the drafting ratio is mainly concentrated in the one or two zones of the five rollers. The temperature of the hot roller is the superposition of the actual hot roller heating control temperature and the heat of the tow itself. The five rollers are in close contact with the tow (equivalent to pulling at both ends). The closer the contact between the tow and the hot roller, the easier it is for the heat of the tow to be transferred to the hot roller. At the same time, heat will be generated during the drafting and friction between the tow and the hot roller, causing the one or two zones of the five rollers to overheat.

[0021] In the actual production process, oil is needed to protect the tow. However, after the oil carried by the tow comes into contact with the high-temperature hot roller, the hot roller will gradually coke. The more coke there is between the tow and the hot roller, the more it affects the heating between the tow and the hot roller. When the heating between the tow and the hot roller decreases, the temperature of the first and second zones of the five rollers decreases, the orientation of the polyester polymer chain deteriorates, and the whiteness of the polyester industrial yarn products will appear darker. After the rollers are washed periodically, there is no coke between the tow and the hot roller, the heating between the tow and the hot roller is normal, the temperature of the first and second zones of the five rollers is overheated, the orientation of the polyester polymer chain improves, and the whiteness of the polyester industrial yarn products becomes whiter. This makes the whiteness of the polyester industrial yarn periodically white and dark, which has a great impact on the product quality.

[0022] The invention discloses a method for producing stable polyester industrial yarn orientation, which monitors and automatically controls the over-temperature of the first and second zones of the five-roller, keeps the temperature of the first and second zones of the five-roller always stable within a specific over-temperature range, stabilizes the orientation of the yarn bundle, and avoids the problem of product quality fluctuation.

[0023] Beneficial effects:

[0024] The present invention monitors the temperature of the first zone and the second zone on the five-roller in real time. When the temperature exceeds the set allowable temperature range, the temperature of the first zone and the second zone of the five-roller is adjusted by controlling the speed of the fifth roller and the sixth roller to ensure that the filament bundle is heated normally on the hot roller, thereby ensuring the stability of the quality of the polyester industrial yarn without reducing the physical properties of the product and avoiding the occurrence of quality problems such as color difference or uneven dyeing in the later stage caused by the coking period of the hot roller during the production process due to the use of oil; in addition, the present invention does not reduce the physical properties of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the distribution of the drafting rollers and the filament bundles of the present invention;

[0026] Among them, 1-tow, 2-one roller, 3-two rollers, 4-three rollers, 5-four rollers, 6-five rollers, 7-six rollers, 8-seven rollers, 9-eight rollers, 10-nine rollers, 11-ten rollers. DETAILED DESCRIPTION

[0027] The present invention will be further described below in conjunction with specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and are not intended to limit the scope of the present invention. In addition, it should be understood that after reading the content taught by the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms fall within the scope limited by the appended claims of the application equally.

[0028] The testing methods of the relevant performance indicators in the following embodiments and comparative examples are as follows:

[0029] Whiteness qualified rate: The polyester industrial yarns prepared in each embodiment and comparative example (4 spindles were taken from each spinning position and samples were taken every 8 hours) were respectively wound with the standard yarns of corresponding specifications on the YG088 raw yarn colorimeter (the same colorimeter used in patent CN115029909A) for the same number of turns, and then color graded according to the gray card color difference grade (refer to GB / T 250-2008 standard), grade ≥4.5 is qualified (i.e. AA grade), grade <4.5 is unqualified (i.e. A grade), and then the qualified rate is calculated based on the total number of samples and the qualified number of samples; among them, the speed is set at 250r / min, and the number of wire windings for each specification on the colorimeter is required: 300 turns for 500D and below, 200 turns for 500D and above and 840D and below, 150 turns for 1000D to 1500D, 100 turns for 2000D, 75 turns for 3000D, and 50 turns for 6000D.

[0030] Breaking strength: first, the polyester industrial yarn prepared in each embodiment and comparative example is used as a sample, and its linear density is measured with reference to GB / T 14343-2008 standard (the standard atmosphere for humidity adjustment and testing is implemented as specified in 4.3.2.2, the pre-tension per unit linear density is specified to be 0.05 cN / dtex, and 50 turns are wound using a YG086 yarn length measuring instrument), and then the measured linear density is input into an automatic tensile tester (model: STATIMAT 4U), and with reference to GB / T 14344-2022 standard, the sample is stretched by the automatic tensile tester under the test conditions (nominal clamping length: 500 mm, test speed: 500 mm / min, pre-tension: 0.05 cN / dtex) until it breaks, and the breaking strength value is automatically calculated by a computer, and the breaking strength is the ratio of strength to linear density. Each sample is tested 5 times, and then the average value is calculated.

[0031] CV value of breaking strength: The polyester industrial yarn prepared in each embodiment and comparative example was used as a sample, and with reference to GB / T14344-2022 standard, an automatic tensile tester (model: STATIMAT 4U) was used to stretch the sample until it broke under the test conditions (nominal clamping length: 500 mm, test speed: 500 mm / min, pre-tension: 0.05 cN / dtex). The breaking strength value was automatically calculated by a computer. The breaking strength is the ratio of strength to linear density. Each sample was measured 5 times, and the breaking strength CV value (i.e., coefficient of variation) of the sample was calculated based on the 5 measured results. The coefficient of variation CV is the ratio of the standard deviation of the 5 measured results to the arithmetic mean.

[0032] Elongation at break: The polyester industrial yarn prepared in each embodiment and comparative example was used as a sample. Referring to GB / T 14344-2022 standard, an automatic tensile tester (model: STATIMAT 4U) was used to stretch the sample until it broke under the test conditions (nominal clamping length: 500 mm, test speed: 500 mm / min, pre-tension: 0.05 cN / dtex). Each sample was tested 5 times, and then the average value was calculated. The elongation at break is the ratio of the elongation value of the sample when it is stretched from the initial length to the initial length.

[0033] Elongation at break CV value: The polyester industrial yarn prepared in each embodiment and comparative example was used as a sample, and with reference to GB / T14344-2022 standard, an automatic tensile tester (model: STATIMAT 4U) was used to stretch the sample until it broke under the test conditions (nominal clamping length: 500 mm, test speed: 500 mm / min, pre-tension: 0.05 cN / dtex). The elongation at break is the ratio of the elongation value of the sample when it is stretched from the initial length to the initial length. Each sample was measured 5 times, and the CV value (i.e., coefficient of variation) of the elongation at break of the sample was calculated based on the 5 measurement results. The coefficient of variation CV is the ratio of the standard deviation of the 5 measured results to the arithmetic mean.

[0034] Dry heat shrinkage rate: The polyester industrial yarn prepared in each embodiment and comparative example was used as a sample. Referring to GB / T 16604-2017 standard, a BlueJin TST510 dry heat instrument was used to perform hot air treatment on a sample with a length of 250 mm under given pretension (0.05 cN / dtex), temperature (177°C) and time (10 min). The percentage of length shrinkage of the sample before and after heating was calculated.

[0035] Example 1

[0036] A production method for stabilizing the orientation of polyester industrial yarn, the specific process is as follows:

[0037] The spun yarn is oiled and then drawn and shaped by five pairs of drawing rollers, and then wound at a speed of 2680 m / min to obtain polyester industrial yarn; Figure 1 As shown, all the drafting rollers along the running direction of the tow 1 are respectively recorded as roller 1 2, roller 2 3, roller 3 4, roller 4 5, roller 5 6, roller 6 7, roller 7 8, roller 8 9, roller 9 10, and roller 11. The roller 5 6 includes seven heating zones of equal length along the length direction, which are zone 1, zone 2, zone 3, zone 4, zone 5, zone 6, and zone 7 from the free end to the other end.

[0038] During the drafting and shaping process, the temperature, speed and number of windings of the five pairs of drafting rollers are set as follows: the speed of the first pair of rollers is 460m / min and the temperature is 60°C; the speed of the second pair of rollers is 470m / min and the temperature is 95°C; the speed of the third pair of rollers is 1850m / min and the temperature is 130°C; the speed of the fourth pair of rollers is 2800m / min and the temperature is 220°C; the speed of the fifth pair of rollers is 2800m / min and the temperature is 140°C; the number of windings of the tow on the first pair of rollers to the fifth pair of rollers is 2, 3, 3, 3 and 3 respectively;

[0039] First, set the allowable temperature range of the first zone on the five rollers to 152~155℃, and the allowable temperature range of the second zone to 139~140℃. During the stretching and shaping process, the temperature of the first zone and the second zone are respectively monitored in real time by the temperature sensor. When the temperature of the first zone is lower than 152℃ or the temperature of the second zone is lower than 139℃, the control system will transmit the information to the computer, and the computer will transmit the information to the fifth and sixth rollers, and the fifth and sixth rollers will be lowered at a speed of 1m / min, so that the temperature of the first and second zones on the five rollers will be increased to within the allowable temperature range; when the temperature of the first zone is greater than 155℃ or the temperature of the second zone is greater than 140℃, the fifth and sixth rollers will be increased at a speed of 1m / min by the control system, so as to reduce the temperature of the first and second zones on the five rollers to within the allowable temperature range;

[0040] The specification of the produced polyester industrial yarn is 3350dtex / 384f, and the whiteness qualified rate is 99.9%; the breaking strength of the polyester industrial yarn is 8.45cN / dtex, the breaking strength CV value is 0.9%, the breaking elongation is 14.7%, the breaking elongation CV value is 2.7%, and the dry heat shrinkage rate is 7.4%.

[0041] Comparative Example 1

[0042] A method for producing polyester industrial yarn is basically the same as that of Example 1, except that the temperature of the first and second zones on the five rollers is not controlled during the drawing process.

[0043] The specifications of the obtained polyester industrial yarn are the same as those in Example 1, and the whiteness qualified rate is 97.5%; the breaking strength CV value of the polyester industrial yarn is 1.2%, and the breaking elongation CV value is 3.3%.

[0044] By comparing Comparative Example 1 with Example 1, it can be seen that Comparative Example 1 will be affected by the coke on the hot roller during the preparation of the polyester industrial yarn, resulting in a low whiteness pass rate and increased breaking strength CV value and breaking elongation CV value. This is because when coke appears on the hot roller, the polyester industrial yarn on the hot roller will be affected by the heating, which makes the orientation degree of the polyester polymer chain smaller. After the roller is washed periodically, the orientation degree of the polyester polymer chain will increase again, which leads to a large fluctuation in the orientation of the polyester polymer chain, thereby reducing the whiteness pass rate; in addition, when the orientation degree of the polyester polymer chain deteriorates, it will also affect the mechanical properties of the polyester industrial yarn, and ultimately cause the breaking strength CV value and the breaking elongation CV value to increase.

[0045] Comparative Example 2

[0046] A method for producing polyester industrial yarn is basically the same as that in Example 1, except that during the drawing and shaping process, the temperature of the first zone on the five rollers is controlled within the range of 149-151° C., and the temperature of the second zone is controlled within the range of 137-138° C.

[0047] The specifications of the obtained polyester industrial yarn were the same as those in Example 1, and the whiteness qualified rate was 0%; the breaking strength of the polyester industrial yarn was 8.40 cN / dtex, and the breaking elongation was 14.8%.

[0048] By comparing Comparative Example 2 with Example 1, it can be seen that the polyester industrial yarns obtained in Comparative Example 2 are all darker, deviating from the product standard in Example 1, and the whiteness qualified rate is 0%. This is because the allowable temperature range of the first and second zones on the five rollers in Comparative Example 2 is controlled at a lower level, which will make the actual temperature of the first and second zones on the five rollers higher than the control temperature in actual production, so it is necessary to increase the speed of the fifth and sixth rollers, which also leads to a smaller molecular chain orientation of the polyester industrial yarn and a darker whiteness of the polyester industrial yarn.

[0049] Comparative Example 3

[0050] A method for producing polyester industrial yarn is basically the same as that in Example 1, except that during the drawing and shaping process, the temperature of the first zone on the five rollers is controlled within the range of 156-158° C., and the temperature of the second zone is controlled within the range of 141-143° C.

[0051] The specifications of the obtained polyester industrial yarn were the same as those in Example 1, and the whiteness qualified rate was 0%; the breaking strength of the polyester industrial yarn was 8.50 cN / dtex, and the breaking elongation was 14.6%.

[0052] By comparing Comparative Example 3 with Example 1, it can be seen that the polyester industrial yarns obtained in Comparative Example 3 are all white, deviating from the standard sample of the standard product of this specification, and the whiteness qualified rate is 0%. This is because the allowable temperature range of the first and second zones of the five rollers in Comparative Example 3 is controlled to be relatively high, which will make the actual temperature of the first and second zones of the five rollers lower than the control temperature in actual production, so it is necessary to reduce the speed of the fifth and sixth rollers, which also leads to a larger orientation degree of the molecular chain of the polyester industrial yarn and a whiteness of the polyester industrial yarn.

[0053] Example 2

[0054] A production method for stabilizing the orientation of polyester industrial yarn, the specific process is as follows:

[0055] The spun yarn bundles were oiled, stretched and shaped by five pairs of drafting rollers, and then wound at a speed of 2720 m / min to obtain polyester industrial yarns; wherein, all the drafting rollers along the running direction of the yarn bundles were respectively recorded as one roller, two rollers, three rollers, four rollers, five rollers, six rollers, seven rollers, eight rollers, nine rollers, and ten rollers, and the five rollers along the length direction included seven heating zones of equal length, which were zone one, zone two, zone three, zone four, zone five, zone six, and zone seven from the free end to the other end;

[0056] During the drafting and shaping process, the temperature, speed and number of windings of the five pairs of drafting rollers are set as follows: the speed of the first pair of rollers is 470 m / min and the temperature is 65°C; the speed of the second pair of rollers is 480 m / min and the temperature is 100°C; the speed of the third pair of rollers is 1900 m / min and the temperature is 140°C; the speed of the fourth pair of rollers is 2850 m / min and the temperature is 225°C; the speed of the fifth pair of rollers is 2830 m / min and the temperature is 160°C; the number of windings of the tow on the first pair of rollers to the fifth pair of rollers is 3, 5, 5, 5 and 5 respectively;

[0057] First, set the allowable temperature range of the first zone on the five rollers to 162~165℃, and the allowable temperature range of the second zone to 149~150℃. During the stretching and shaping process, the temperature of the first zone and the second zone are respectively monitored in real time by the temperature sensor. When the temperature of the first zone is lower than 162℃ or the temperature of the second zone is lower than 149℃, the control system will transmit the information to the computer, and the computer will transmit the information to the fifth and sixth rollers, and the fifth and sixth rollers will be lowered at a speed of 1m / min, so that the temperature of the first and second zones on the five rollers will be increased to within the allowable temperature range; when the temperature of the first zone is greater than 165℃ or the temperature of the second zone is greater than 150℃, the fifth and sixth rollers will be increased at a speed of 1m / min by the control system, so as to reduce the temperature of the first and second zones on the five rollers to within the allowable temperature range;

[0058] The specification of the produced polyester industrial yarn is 3450dtex / 384f, and the whiteness qualified rate is 99.9%; the breaking strength of the polyester industrial yarn is 8.35cN / dtex, the breaking strength CV value is 1.0%, the breaking elongation is 14.9%, the breaking elongation CV value is 2.9%, and the dry heat shrinkage rate is 7.2%.

[0059] Example 3

[0060] A production method for stabilizing the orientation of polyester industrial yarn, the specific process is as follows:

[0061] The spun yarn bundles were oiled and then drawn and shaped by five pairs of drawing rollers, and then wound at a speed of 2700 m / min to obtain polyester industrial yarns; wherein, all the drawing rollers along the running direction of the yarn bundles were respectively recorded as one roller, two rollers, three rollers, four rollers, five rollers, six rollers, seven rollers, eight rollers, nine rollers, and ten rollers, and the five rollers along the length direction included seven heating zones of equal length, which were one zone, two zones, three zones, four zones, five zones, six zones, and seven zones from the free end to the other end;

[0062] During the drafting and shaping process, the temperature, speed and number of windings of the five pairs of drafting rollers are set as follows: the speed of the first pair of rollers is 465m / min and the temperature is 63°C; the speed of the second pair of rollers is 475m / min and the temperature is 98°C; the speed of the third pair of rollers is 1880m / min and the temperature is 135°C; the speed of the fourth pair of rollers is 2900m / min and the temperature is 230°C; the speed of the fifth pair of rollers is 2850m / min and the temperature is 150°C; the number of windings of the tow on the first to fifth pairs of rollers is 2, 4, 4, 4 and 4 respectively;

[0063] First, set the allowable temperature range of the first zone on the five rollers to 157~160℃, and the allowable temperature range of the second zone to 144~145℃. During the stretching and shaping process, the temperature of the first zone and the second zone are respectively monitored in real time by the temperature sensor. When the temperature of the first zone is lower than 157℃ or the temperature of the second zone is lower than 144℃, the control system will transmit the information to the computer, and the computer will transmit the information to the fifth and sixth rollers, and the fifth and sixth rollers will be lowered at a speed of 1m / min, so that the temperature of the first and second zones on the five rollers will be increased to within the allowable temperature range; when the temperature of the first zone is greater than 160℃ or the temperature of the second zone is greater than 145℃, the fifth and sixth rollers will be increased at a speed of 1m / min by the control system, so as to reduce the temperature of the first and second zones on the five rollers to within the allowable temperature range;

[0064] The specification of the produced polyester industrial yarn is 3400dtex / 384f, and the whiteness qualified rate is 99.9%; the breaking strength of the polyester industrial yarn is 8.4cN / dtex, the breaking strength CV value is 0.95%, the breaking elongation is 14.8%, the breaking elongation CV value is 2.8%, and the dry heat shrinkage rate is 7.0%.

[0065] Example 4

[0066] A production method for stabilizing the orientation of polyester industrial yarn, the specific process is as follows:

[0067] The spun yarn bundles were oiled and then drawn and shaped by five pairs of drawing rollers, and then wound at a speed of 2700 m / min to obtain polyester industrial yarns; wherein, all the drawing rollers along the running direction of the yarn bundles were respectively recorded as one roller, two rollers, three rollers, four rollers, five rollers, six rollers, seven rollers, eight rollers, nine rollers, and ten rollers, and the five rollers along the length direction included seven heating zones of equal length, which were one zone, two zones, three zones, four zones, five zones, six zones, and seven zones from the free end to the other end;

[0068] During the drafting and shaping process, the temperature, speed and number of windings of the five pairs of drafting rollers are set as follows: the speed of the first pair of rollers is 490 m / min and the temperature is 60°C; the speed of the second pair of rollers is 500 m / min and the temperature is 98°C; the speed of the third pair of rollers is 1870 m / min and the temperature is 133°C; the speed of the fourth pair of rollers is 2815 m / min and the temperature is 224°C; the speed of the fifth pair of rollers is 2750 m / min and the temperature is 155°C; the number of windings of the tow on the first to fifth pairs of rollers is 2, 4, 4, 4 and 4 respectively;

[0069] First, set the allowable temperature range of the first zone on the five rollers to 148~151℃, and the allowable temperature range of the second zone to 138~139℃. During the stretching and shaping process, the temperature of the first zone and the second zone are respectively monitored in real time by the temperature sensor. When the temperature of the first zone is lower than 148℃ or the temperature of the second zone is lower than 138℃, the control system will transmit the information to the computer, and the computer will transmit the information to the fifth and sixth rollers, and the fifth and sixth rollers will be lowered at a speed of 1m / min, so that the temperature of the first and second zones on the five rollers will be increased to within the allowable temperature range; when the temperature of the first zone is greater than 151℃ or the temperature of the second zone is greater than 139℃, the control system will increase the speed of the fifth and sixth rollers at 1m / min, so as to reduce the temperature of the first and second zones on the five rollers to within the allowable temperature range;

[0070] The specification of the produced polyester industrial yarn is 930dtex / 192f, and the whiteness qualified rate is 99.9%; the breaking strength of the polyester industrial yarn is 8.40cN / dtex, the breaking strength CV value is 0.8%, the breaking elongation is 14.5%, the breaking elongation CV value is 2.55%, and the dry heat shrinkage rate is 7.4%.

[0071] Example 5

[0072] A production method for stabilizing the orientation of polyester industrial yarn, the specific process is as follows:

[0073] The spun yarn bundles were oiled and then drawn and shaped by five pairs of drawing rollers, and then wound at a speed of 2700 m / min to obtain polyester industrial yarns; wherein, all the drawing rollers along the running direction of the yarn bundles were respectively recorded as one roller, two rollers, three rollers, four rollers, five rollers, six rollers, seven rollers, eight rollers, nine rollers, and ten rollers, and the five rollers along the length direction included seven heating zones of equal length, which were one zone, two zones, three zones, four zones, five zones, six zones, and seven zones from the free end to the other end;

[0074] During the drafting and shaping process, the temperature, speed and number of windings of the five pairs of drafting rollers are set as follows: the speed of the first pair of rollers is 480 m / min and the temperature is 60°C; the speed of the second pair of rollers is 490 m / min and the temperature is 98°C; the speed of the third pair of rollers is 1870 m / min and the temperature is 133°C; the speed of the fourth pair of rollers is 2820 m / min and the temperature is 233°C; the speed of the fifth pair of rollers is 2790 m / min and the temperature is 158°C; the number of windings of the tow on the first to fifth pairs of rollers is 3, 5, 5, 5 and 5 respectively;

[0075] First, set the allowable temperature range of the first zone on the five rollers to 151~154℃, and the allowable temperature range of the second zone to 140~141℃. During the stretching and shaping process, the temperature of the first zone and the second zone are respectively monitored in real time by the temperature sensor. When the temperature of the first zone is lower than 151℃ or the temperature of the second zone is lower than 140℃, the control system will transmit the information to the computer, and the computer will transmit the information to the fifth and sixth rollers, and the fifth and sixth rollers will be lowered at a speed of 1m / min, so that the temperature of the first and second zones on the five rollers will be increased to within the allowable temperature range; when the temperature of the first zone is greater than 154℃ or the temperature of the second zone is greater than 141℃, the fifth and sixth rollers will be increased at a speed of 1m / min by the control system, so as to reduce the temperature of the first and second zones on the five rollers to within the allowable temperature range;

[0076] The specification of the produced polyester industrial yarn is 1100dtex / 192f, and the whiteness qualified rate is 99.9%; the breaking strength of the polyester industrial yarn is 8.43cN / dtex, the breaking strength CV value is 0.85%, the breaking elongation is 14.6%, the breaking elongation CV value is 2.6%, and the dry heat shrinkage rate is 7.45%.

Claims

1. A production method for stabilizing the orientation of polyester industrial yarns, wherein the yarn bundles obtained by spinning are oiled, stretched and shaped by five pairs of drafting rollers, and then wound to obtain polyester industrial yarns; all the drafting rollers along the running direction of the yarn bundles are respectively recorded as one roller, two rollers, three rollers, four rollers, five rollers, six rollers, seven rollers, eight rollers, nine rollers, and ten rollers, characterized in that: The fineness of polyester industrial yarn is not less than 840D; along the length direction of the five rollers, the five rollers include seven heating zones of equal length, which are zone 1, zone 2, zone 3, zone 4, zone 5, zone 6 and zone 7 from the free end to the other end; during the drafting and shaping process, the temperature of zone 1 on the five rollers is controlled to exceed the set temperature of the five rollers by 22-25°C, and the temperature of zone 2 is controlled to exceed the set temperature of the five rollers by 9-10°C; The five-roller temperature setting is 130-140°C; Set the allowable temperature range of zone 1 and zone 2 on the five-roller, and monitor the temperature of zone 1 and zone 2 in real time through temperature sensors. When the temperature of zone 1 and zone 2 exceeds the set allowable temperature range, change the temperature of zone 1 and zone 2 by adjusting the speed of the five-roller and the six-roller.

2. The method for producing a stable orientation of polyester industrial yarn according to claim 1, characterized in that: The tow is wound around each pair of rollers 3 to 6 times.

3. The method for producing a stable orientation of polyester industrial yarn according to claim 1, characterized in that: The specifications of polyester industrial yarn are 930dtex / 192f, 1100dtex / 192f or 3300-3400dtex / 384f.

4. The method for producing a stable orientation of polyester industrial yarn according to claim 3, characterized in that: When the specification of polyester industrial yarn is 930dtex / 192f, during the drafting and shaping process, the temperature and speed of the five pairs of drafting rollers are as follows: the speed of the first pair of rollers is 480-490m / min, the temperature is 60-65℃; the speed of the second pair of rollers is 490-500m / min, the temperature is 95-100℃; the speed of the third pair of rollers is 1850-1900m / min, the temperature is 130-140℃; the speed of the fourth pair of rollers is 2800-2900m / min, the temperature is 220-230℃; the speed of the fifth pair of rollers is 2800-2850m / min, the temperature is 140-160℃; When the specification of polyester industrial yarn is 1100dtex / 192f, during the drafting and shaping process, the temperature and speed of the five pairs of drafting rollers are as follows: the speed of the first pair of rollers is 470-480m / min, the temperature is 60-65℃; the speed of the second pair of rollers is 480-490m / min, the temperature is 95-100℃; the speed of the third pair of rollers is 1850-1900m / min, the temperature is 130-140℃; the speed of the fourth pair of rollers is 2800-2900m / min, the temperature is 220-230℃; the speed of the fifth pair of rollers is 2800-2850m / min, the temperature is 140-160℃; When the specification of polyester industrial yarn is 3300-3400dtex / 384f, during the stretching and shaping process, the temperature and speed of the five pairs of stretching rollers are: the speed of the first pair of rollers is 460-470m / min, and the temperature is 60-65℃; the speed of the second pair of rollers is 470-480m / min, and the temperature is 95-100℃; the speed of the third pair of rollers is 1850-1900m / min, and the temperature is 130-140℃; the speed of the fourth pair of rollers is 2800-2900m / min, and the temperature is 220-230℃; the speed of the fifth pair of rollers is 2800-2850m / min, and the temperature is 140-160℃.

5. The method for producing a stable orientation of polyester industrial yarn according to claim 4, characterized in that: The winding speed is 2680~2720m / min.

6. The method for producing a stable orientation of polyester industrial yarn according to claim 5, characterized in that: During the stretching and shaping process, the temperature of the first zone on the five rollers is controlled in the range of 152-165°C, and the temperature of the second zone is controlled in the range of 139-150°C.

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