Production process of POY (polyester pre-oriented yarn)

Abstract

The invention belongs to the technical field of fiber production, and relates to a POY (polyester pre-oriented yarn) production process, which comprises the following steps of: applying oil by adopting a one-inlet one-outlet oil pump, collecting tension of tows at each spindle position once every 1-10 minutes in the oil applying process, and judging the change trend of the tension of the tows at each spindle position along with time after each time of collection; when the tension of a certain spindle position tow becomes smaller along with time, and the tension of the adjacent spindle position tow participating in the filament separation process of the same tow together with the spindle position tow does not change along with time, the spindle position is subjected to oiling abnormity treatment; when the tension of a certain ingot position tow is reduced along with time and the tension of the adjacent ingot position tow participating in the filament separation process of the same tow together with the ingot position tow is increased along with time, carrying out filament separation abnormity treatment on the two ingot positions; and when the tension of the tows at all the spindle positions becomes smaller or larger along with time, vehicle speed abnormity processing is carried out on all the spindle positions. The method can timely and accurately monitor the tension abnormity of the tow, timely correct the abnormal condition, improve the product quality and reduce the loss.

Description

Technical Field

[0001] The invention belongs to the technical field of fiber production, and in particular relates to a production process of POY yarn. Background Art

[0002] In the field of POY yarn production, fiber fineness, oiling rate and spinning speed are one of the important process parameter values. When the fiber passes through the oiling unit, the chemical fiber oil will be evenly covered on the surface of the tow, making the fiber soft and smooth, reducing the friction between the single filaments and between the tow and the wire guide porcelain, thereby effectively preventing the POY yarn from generating hair and static electricity. Therefore, in the production process of POY yarn, maintaining the continuity of the tow oiling has a great impact on the quality of the raw yarn. In addition, during the spinning process, if the yarn is mis-separated due to the head of the board or the floating yarn, the fineness of the tow will change; and the abnormal spinning speed will also cause the fineness and elongation to not meet the requirements, which will seriously affect the quality of the raw yarn.

[0003] In order to deal with the above situation, in the current production process, a variety of measures have been taken to monitor the relevant physical properties of the tow to reflect the stability of the quality of the raw silk product. For example, for the oiling rate problem, it mainly relies on periodic sampling and uses a nuclear magnetic resonance fiber oiling rate analyzer for testing. However, this method has obvious shortcomings: first, the periodic sampling time is long, sampling and testing require additional time, and real-time online monitoring cannot be achieved; second, for abnormalities occurring during the sampling interval, there is no timely feedback, which not only affects product quality, but may also lead to increased losses. For the problem of misclassified yarns, measures taken include periodic weighing and manual visual inspection. However, periodic weighing also has the problems of long cycle, inability to monitor online in real time and timely feedback of abnormalities, and the uncertainty caused by human factors is large, and abnormalities are easily missed. Finally, for the spinning speed problem, periodic sampling and elongation testing using a tensile tester are used to determine whether there is a problem. However, this method also has the defects of long periodic sampling time and inability to monitor online in real time, and it is impossible to respond to abnormalities during the sampling interval in a timely manner. Trying to shorten the cycle sampling time may increase feedback speed, but it will lead to a significant increase in workload, which will increase the unit cost of the product.

[0004] Therefore, it is necessary to propose a new POY yarn production process in order to provide timely feedback on various abnormalities so that operators can correct the abnormalities in a timely and correct manner, thereby improving product quality and reducing losses. Summary of the invention

[0005] The purpose of the present invention is to solve the problems in the prior art and provide a production process for POY yarn.

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

[0007] The present invention firstly explores the relationship between the change of the tow tension and the corresponding abnormalities (abnormal oiling, abnormal yarn splitting, abnormal vehicle speed) when the 1-input and 1-output oil pump is used for oiling after the filament splitter splits the filaments in the production process of POY filaments;

[0008] Abnormal oiling: 83dtex / 144f yarn was used for the experiment. The oiling rate was artificially changed (the speed of the oil pump was changed), including 5 oiling rate values: 0.48% (standard value), 0.41%, 0.29%, 0.20%, and 0.00%. The tension changes of the yarn bundles corresponding to the same wire separator on 10 spindles were observed, that is, the tension of the yarn bundles on spindles 1 and 2, the tension of the yarn bundles on spindles 3 and 4, and so on. The results are as follows: Figure 3 shown; from Figure 3 It can be seen from the tension changes of each spindle that when the oil application rate of a certain spindle changes abnormally (becomes smaller), the yarn bundle tension on this spindle becomes smaller, and the yarn bundle tension of another spindle corresponding to the same wire divider remains unchanged.

[0009] Abnormal yarn splitting: 137dtex / 48f yarn was used for the experiment. The yarn was split wrongly intentionally. The tension changes of the yarn bundles corresponding to the same yarn splitter on 10 spindles were observed, that is, the tension of the yarn bundles on spindles 1 and 2, the tension of the yarn bundles on spindles 3 and 4, and so on. The results are as follows: Figure 4 shown; from Figure 4 It can be seen from the changes in the tension of the yarn bundles at each spindle position that when mis-wire separation occurs, the changes in the tension of the yarn bundles at the two spindle positions corresponding to the same wire divider are opposite, that is, the tension of the yarn bundle on one spindle position increases, and the tension of the yarn bundle on the other spindle position becomes smaller.

[0010] Abnormal speed: 83dtex / 144f yarn was used for the experiment. The speed was artificially changed to cause abnormal speed (normal process speed is 2480m / min). The tension changes of the yarn bundles corresponding to the same wire separator on 10 spindles were observed, that is, the tension of the yarn bundles on spindles 1 and 2, the tension of the yarn bundles on spindles 3 and 4, and so on. The results are as follows: Figure 5 shown; from Figure 5 It can be seen from the tension changes of the yarn bundles at each spindle position that when the vehicle speed is abnormal, the tension changes of the yarn bundles at the two spindle positions corresponding to the same wire divider are consistent, that is, the yarn bundles on the two spindle positions become larger or smaller at the same time.

[0011] Based on the relationship between the change in the tow tension and the corresponding anomaly obtained from the above research, this application proposes the following technical solutions:

[0012] A POY yarn production process, in the POY yarn production process, a 1-in 1-out oil pump is used for oiling, during the oiling process, the tension of the yarn bundle at each spindle position is collected once every 1 to 5 minutes, after each collection, the change trend of the tension of the yarn bundle at each spindle position over time is judged, and corresponding adjustments are made;

[0013] When the tension of a certain spindle bundle decreases with time, and synchronously, the tension of the spindle bundle adjacent to it and participating in the same bundle splitting process does not change with time, the spindle is subjected to abnormal oiling treatment;

[0014] When the tension of a certain spindle position's silk bundle decreases over time, and synchronously, the tension of the spindle position's silk bundle that is adjacent to it and participates in the silk splitting process of the same silk bundle increases over time, the two spindle positions are subjected to silk splitting abnormality processing;

[0015] When the tension of the yarn bundles at all spindle positions decreases or increases over time, abnormal speed processing is performed on all spindle positions.

[0016] A POY wire production process as described above, wherein the tension of the wire bundle at each spindle position is collected synchronously with the wire guiding, and the devices used by the two include a wire guiding porcelain piece, a metal rod, a metal round tube, a resistance strain gauge and a computer;

[0017] The guide wire porcelain piece is formed by bending and deforming a cylinder a, and the metal rod is a cylinder b. The diameters of cylinder a and cylinder b are the same. One end of the guide wire porcelain piece is connected to the metal rod by a pin and glue, and the other end is a free end.

[0018] The metal rod is inserted into the metal round tube, and the two can rotate relative to each other;

[0019] The resistance strain gauge is fixed on the inner wall of the metal round tube and clamped between the metal rod and the metal round tube;

[0020] The horizontal force applied by the wire bundle to the guide wire porcelain is transmitted to the resistance strain gauge. When the resistance strain gauge is subjected to pressure, its shape and size will change, causing the resistance to change, thereby generating an electrical signal. The computer is used to collect the electrical signal of the resistance strain gauge, and perform conversion analysis to obtain the tension.

[0021] In the production process of a POY wire as described above, the resistance strain gauge is a foil-type resistance gauge, adopts a rectangular sensitive grid design, and is made of alloy materials such as Constantan foil or nickel-chromium foil. It consists of four resistance gauges evenly distributed around the circumference of the central axis of a metal circular tube and connected in a Wheatstone full-bridge manner (this connection method has the advantages of high sensitivity, high measurement accuracy, and good reliability). One of the resistance gauges is a measuring resistance gauge, and the other three resistance gauges are temperature compensation resistance gauges for improving test accuracy.

[0022] In the production process of POY yarn as described above, the devices used by the two also include an oil collecting tank; the lower surface of the guide wire porcelain piece is wrapped by the oil collecting tank, and a gap is left between the guide wire porcelain piece and the oil collecting tank. The oil collecting tank can receive the oil droplets generated by the yarn bundle on the guide wire porcelain piece and recycle them.

[0023] In the above-mentioned POY yarn production process, each spindle position corresponds to an oil pump, and the spindle position is subjected to abnormal oiling treatment, that is, the speed of the oil pump of the spindle position is adjusted to R2. , F1 is the tension value when the tension of the tow at this spindle position does not change, F2 is the current value of the tension of the tow at this spindle position, and R1 is the speed of the oil pump when the tension of the tow at this spindle position does not change.

[0024] In the production process of a POY yarn as described above, the method for handling abnormal yarn separation for these two spindle positions is the same, specifically: first determine whether the yarn bundle of the spindle position is less than 1.5kg in the machine set weight. If not, the spindle position is manually restored, and after it is fully wound, the product of the spindle position with the wrong yarn separation is downgraded; otherwise, it is manually restored, and the spinning position is switched immediately after the restoration.

[0025] In the production process of POY yarn as described above, all spindles are subjected to abnormal speed processing, that is, the yarn bundles of all spindles are cut off, spinning is stopped at all spindles, and all process parameters are checked to be accurate before resuming production.

[0026] As described above, in a production process for POY yarn, the specifications of the POY yarn are that the thickness of the single yarn is between 50D and 200D, the number of yarns is between 48F and 144F, the oiling abnormality unqualified rate calculated within a sampling period of 20 days does not exceed 0.50%, the silk splitting abnormality unqualified rate calculated within 2 days of the previous actual longest silk splitting abnormal time does not exceed 0.6%, and the vehicle speed abnormality unqualified rate calculated within 1.5 days of the previous actual longest vehicle speed abnormal time does not exceed 3%; if the tension is not monitored and adjusted, the oiling abnormality unqualified rate calculated within a sampling period of 20 days will reach 10%, the silk splitting abnormality unqualified rate calculated within 2 days of the previous actual longest silk splitting abnormal time will reach 2.00%, and the vehicle speed abnormality unqualified rate calculated within 1.5 days of the previous actual longest vehicle speed abnormal time will reach 8.00%.

[0027] Beneficial Effects

[0028] A POY yarn production process of the present invention can timely and accurately reflect tension abnormalities, determine the specific abnormal cause based on the abnormal tension information, and enable the abnormality to be corrected in time, thereby improving product quality and reducing losses caused by abnormal tension. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1It is a partial structural schematic diagram of the device for synchronously collecting the tension of the wire bundles at each spindle position and the wire guide used in the present invention;

[0030] Figure 2 A schematic diagram of the positional relationship between the oil collecting tank, the wire guiding porcelain parts and the wire bundle in the device for synchronously collecting the tension of the wire bundle at each spindle position and the wire guiding used in the present invention;

[0031] Figure 3 This is a diagram showing the variation of the tow tension at each spindle position obtained when the abnormal oiling experiment is carried out in the present invention;

[0032] Figure 4 This is a diagram of the variation of the tension of the yarn bundle at each spindle position obtained when the abnormal yarn separation experiment of the present invention is carried out;

[0033] Figure 5 This is a diagram showing the variation of the tow tension at each spindle position obtained when the vehicle speed abnormality experiment is carried out in the present invention;

[0034] Among them, 1-metal rod, 3-resistance strain gauge, 4-pin, 5-guide wire porcelain part, 6-wire bundle, 7-metal round tube, 8-oil collecting tank. DETAILED DESCRIPTION

[0035] 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.

[0036] Explanation of relevant indicators in the embodiment:

[0037] The oiling abnormality failure rate calculated within a 20-day sampling period refers to the ratio of the unqualified products produced within 20 days to the total output of a single spinning position in 20 days, which is the period required for complete sampling and oil content measurement of 10 spindles of raw silk at a spinning position;

[0038] The abnormal unqualified rate of yarn splitting is calculated within the actual longest abnormal time of 2 days in the past: it is based on the longest time (2 days) from the occurrence of abnormality to the discovery of abnormality by manual inspection and the corrective measures taken during the production process, and the proportion of unqualified products produced within these 2 days to the total output of a single spinning position in 20 days;

[0039] The speed abnormality failure rate was calculated based on the longest actual speed abnormality time of 1.5 days in the past: it is based on the longest time (1.5 days) from the occurrence of the abnormality to the corrective measures taken during the manual inspection to discover the abnormality in the production process, and the proportion of unqualified products produced within 1.5 days to the total output of the spinning position in 20 days.

[0040] A device for synchronously collecting the tension and guide wire of each spindle position, such as Figure 1 As shown, it includes a guide wire porcelain part 5, a metal rod 1, a metal round tube 7, an oil collecting tank 8, a resistance strain gauge 3 and a computer;

[0041] The guide wire porcelain piece 5 is formed by bending and deforming the cylinder a;

[0042] The metal rod 1 is a cylinder b, and the diameters of the cylinder a and the cylinder b are the same;

[0043] One end of the guide wire porcelain 5 is connected to the metal rod 1 through a pin 4 and glue, and the other end is a free end; the metal rod 1 is inserted into the metal round tube 7, and the two can rotate relative to each other;

[0044] The lower surface of the guide wire porcelain 5 is wrapped by the oil collecting groove 8. Figure 2 As shown, there is a gap between the wire guide porcelain piece 5 and the oil collecting groove 8; the oil collecting groove 8 can receive the oil droplets generated by the wire bundle 6 on the wire guide porcelain piece 5;

[0045] like Figure 1 As shown, the resistance strain gauge 3 is fixed on the inner wall of the metal tube 7 and clamped between the metal rod 1 and the metal tube 7; the resistance strain gauge 3 is a foil-type resistance gauge (made of alloy materials such as Constantan foil or nickel-chromium foil), adopts a rectangular sensitive grid design, and is composed of four resistance gauges evenly distributed around the circumference of the central axis of the metal tube 7 and connected in a Wheatstone bridge manner, one of which is a measuring resistance gauge, and the other three are temperature compensation resistance gauges;

[0046] The computer is used to collect the electrical signal of the resistance strain gauge 3, and perform conversion analysis to obtain the tension.

[0047] Example 1

[0048] A POY yarn production process, wherein oiling is performed using a 1-in 1-out oil pump, and during the oiling process, the above-mentioned device for synchronously collecting the tension of the yarn bundle at each ingot position and guiding the yarn is used to collect the tension of the yarn bundle at each ingot position once every 1 minute (collecting the tension of the yarn bundle at each ingot position and guiding the yarn synchronously), and after each collection, the change trend of the tension of the yarn bundle at each ingot position over time is judged, and corresponding adjustments are made;

[0049] When the tension of a certain spindle bundle decreases over time, and synchronously, the tension of the spindle bundles adjacent to it and participating in the same bundle splitting process does not change over time, the spindle is subjected to abnormal oiling treatment: each spindle corresponds to an oil pump, and the oiling abnormal treatment of the spindle is to adjust the speed of the oil pump of the spindle to R2, , F1 is the tension value when the tension of the tow at this spindle position does not change, F2 is the current value of the tension of the tow at this spindle position, and R1 is the speed of the oil pump when the tension of the tow at this spindle position does not change;

[0050] When the tension of a certain spindle bundle decreases over time, and synchronously, the tension of the spindle bundle adjacent to it and participating in the same spinning process increases over time, the two spindles are subjected to abnormal spinning process; the methods for abnormal spinning process of the two spindles are the same, specifically: first determine whether the fixed weight of the spindle bundle on the machine is less than 1.5kg, if not, manually restore the spindle, and after the full roll, downgrade the product of the spinning position with wrong spinning; otherwise, manually restore it, and switch the spinning position immediately after restoration;

[0051] When the tension of the tows at all spindle positions decreases or increases over time, all spindle positions are subjected to abnormal speed processing: that is, the tows at all spindle positions are cut off, spinning is stopped at all spindle positions, all process parameters are checked to be accurate, and then production is resumed;

[0052] The specification of the produced POY yarn is 50D / 144f. During the spinning process, the number of spindles is 10, the temperature after the heat exchanger is 278.2℃, the heat medium temperature of the melt tube is 282.7℃, the cooling air speed is 0.28m / s, the cooling air temperature is 19℃, the cooling air pressure is 460Pa, the cooling air humidity is 88%, the spinning speed is 2480m / s, and the oil content is 0.48%;

[0053] The oiling abnormality unqualified rate calculated within the 20-day sampling period was 0.25%, the silk separation abnormality unqualified rate calculated within the previous actual longest silk separation abnormality time of 2 days was 0.51%, and the vehicle speed abnormality unqualified rate calculated within the previous actual longest vehicle speed abnormality time of 1.5 days was 2.53%.

[0054] Example 2

[0055] A production process for POY yarn, the spinning equipment used is the same as that in Example 1.

[0056] The specification of the produced POY yarn is 75D / 72f. During the spinning process, the tension of the yarn bundle at each spindle position is collected every 2 minutes. The number of spindle positions is 10, the temperature after the heat exchanger is 282.5℃, the heat medium temperature of the melt tube is 282.7℃, the cooling air speed is 0.4m / s, the cooling air temperature is 19.5℃, the cooling air pressure is 480Pa, the cooling air humidity is 92%, the spinning speed is 2950m / s, and the oil content is 0.36%;

[0057] The oiling abnormality unqualified rate calculated within the 20-day sampling period was 0.13%, the silk separation abnormality unqualified rate calculated within the previous actual longest silk separation abnormality time of 2 days was 0.26%, and the vehicle speed abnormality unqualified rate calculated within the previous actual longest vehicle speed abnormality time of 1.5 days was 1.29%.

[0058] Example 3

[0059] A production process for POY yarn, the spinning equipment used is the same as that in Example 1.

[0060] The specification of the produced POY yarn is 150D / 48F. During the spinning process, the tension of the yarn bundle at each spindle position is collected every 3 minutes. The number of spindle positions is 10, the temperature after the heat exchanger is 277.6℃, the heat medium temperature of the melt tube is 282.7℃, the cooling air speed is 0.62m / s, the cooling air temperature is 18℃, the cooling air pressure is 450Pa, the cooling air humidity is 83%, the spinning speed is 3200m / s, and the oil content is 0.28%;

[0061] The oiling abnormality unqualified rate calculated within the 20-day sampling period was 0.06%, the silk separation abnormality unqualified rate calculated within the previous actual longest silk separation abnormality time of 2 days was 0.12%, and the vehicle speed abnormality unqualified rate calculated within the previous actual longest vehicle speed abnormality time of 1.5 days was 0.60%.

[0062] Example 4

[0063] A production process for POY yarn, the spinning equipment used is the same as that in Example 1.

[0064] The specification of the produced POY yarn is 200D / 48f. During the spinning process, the tension of the yarn bundle at each spindle position is collected every 4 minutes. The number of spindle positions is 10, the temperature after the heat exchanger is 278℃, the heat medium temperature of the melt tube is 283℃, the cooling air speed is 0.66m / s, the cooling air temperature is 18℃, the cooling air pressure is 450Pa, the cooling air humidity is 86%, the spinning speed is 3200m / s, and the oil content is 0.33%;

[0065] The oiling abnormality unqualified rate calculated within the 20-day sampling period was 0.05%, the silk separation abnormality unqualified rate calculated within the previous actual longest silk separation abnormality time of 2 days was 0.09%, and the vehicle speed abnormality unqualified rate calculated within the previous actual longest vehicle speed abnormality time of 1.5 days was 0.46%.

[0066] Example 5

[0067] A POY yarn production process uses a spinning device that is basically the same as that in Example 1, with the only difference being that the computer in the device for synchronously collecting the tension of the yarn bundle at each spindle position and the yarn guide is removed, and during the production process, the tension of the yarn bundle at each spindle position is collected once every 1 minute through an additional tension meter.

[0068] The specification of the produced POY yarn is 50D / 144f, and the process parameters during the spinning process are the same as those in Example 1;

[0069] The oiling abnormality unqualified rate calculated within the 20-day sampling period was 0.48%, the silk separation abnormality unqualified rate calculated within the previous actual longest silk separation abnormality time of 2 days was 0.8%, and the vehicle speed abnormality unqualified rate calculated within the previous actual longest vehicle speed abnormality time of 1.5 days was 2.9%.

[0070] Compared with Example 1, the abnormal unqualified rate of oiling and the abnormal unqualified rate of wire separation in Example 5 are increased. This is because in the POY yarn production process of Example 5, the wire guiding and the collection of the tension of the yarn bundles at each spindle position are not carried out at the same time, and the tension abnormality of the yarn bundle cannot be monitored timely and accurately, resulting in the inability to correct the abnormality in time, which increases the unqualified rate of the produced products.

[0071] Example 6

[0072] A production process of POY yarn, the spinning equipment used is basically the same as that of Example 1, the only difference is that:

[0073] The resistance strain gauge is composed of four resistors distributed on both sides of the inner wall of the metal tube and adopting a 1 / 4 bridge connection method (single-arm bridge connection method). One of the resistors is a measuring resistor, which is located on one side of the inner wall of the metal tube. The other three are standard resistors (with fixed resistance values), which are located on the other side of the inner wall of the metal tube and are evenly distributed along the axial direction of the metal tube.

[0074] The specification of the produced POY yarn is 50D / 144f, and the process parameters during the spinning process are the same as those in Example 1;

[0075] The oiling abnormality unqualified rate calculated within the 20-day sampling period was 0.35%, the silk separation abnormality unqualified rate calculated within the previous actual longest silk separation abnormality time of 2 days was 0.6%, and the vehicle speed abnormality unqualified rate calculated within the previous actual longest vehicle speed abnormality time of 1.5 days was 2.7%.

[0076] Compared with Example 1, the abnormal oiling unqualified rate and the abnormal wire separation unqualified rate of Example 6 are increased. This is because the resistor sheet of Example 6 adopts a 1 / 4 bridge connection method (single-arm bridge connection method). In the single-arm bridge, the standard resistor sheet and the measuring resistor sheet are connected on a proportional arm. This connection method has relatively low sensitivity, and the temperature changes of the measuring resistor sheet and the standard resistor sheet will have a greater impact on the measurement results, resulting in inaccurate detection results, making it impossible to correct the abnormalities in time, and increasing the unqualified rate of the produced products.

Claims

1. A production process for POY yarn, characterized in that: In the production process of POY yarn, a 1-in 1-out oil pump is used for oiling. During the oiling process, the tension of the yarn bundle at each spindle position is collected once every 1-5 minutes. After each collection, the change trend of the tension of the yarn bundle at each spindle position over time is judged and corresponding adjustments are made; When the tension of a certain spindle bundle decreases with time, and synchronously, the tension of the spindle bundle adjacent to it and participating in the same bundle splitting process does not change with time, the spindle is subjected to abnormal oiling treatment; When the tension of a certain spindle position's silk bundle decreases over time, and synchronously, the tension of the spindle position's silk bundle that is adjacent to it and participates in the silk splitting process of the same silk bundle increases over time, the two spindle positions are subjected to silk splitting abnormality processing; When the tension of the yarn bundles at all spindle positions decreases or increases over time, abnormal speed processing is performed on all spindle positions.

2. A POY yarn production process according to claim 1, characterized in that: The tension of the wire bundle at each spindle position is collected synchronously with the wire guiding, and the devices used by the two include a wire guiding porcelain piece (5), a metal rod (1), a metal round tube (7), a resistance strain gauge (3) and a computer; The guide wire porcelain component (5) is formed by bending and deforming a cylinder a, the metal rod (1) is a cylinder b, the cylinder a and the cylinder b have the same diameter, one end of the guide wire porcelain component (5) is connected to the metal rod (1), and the other end is a free end; The metal rod (1) is inserted into the metal round tube (7), and the two can rotate relative to each other; The resistance strain gauge (3) is fixed on the inner wall of the metal round tube (7) and clamped between the metal rod (1) and the metal round tube (7); The computer is used to collect the electrical signal of the resistance strain gauge (3), and perform conversion analysis to obtain the tension.

3. A POY yarn production process according to claim 2, characterized in that: The resistance strain gauge is a foil resistance gauge, adopts a rectangular sensitive grid design, and is composed of four resistance gauges evenly distributed around the circumference of the central axis of the metal circular tube (7) and connected in a Wheatstone full-bridge manner, one of which is a measuring resistance gauge, and the other three are temperature compensation resistance gauges.

4. A POY yarn production process according to claim 2, characterized in that: The devices used in both devices also include an oil collecting groove (8); the lower surface of the guide wire porcelain component (5) is wrapped by the oil collecting groove (8), and a gap is left between the guide wire porcelain component (5) and the oil collecting groove (8).

5. A POY yarn production process according to claim 1, characterized in that: Each spindle position corresponds to an oil pump. The oiling abnormality treatment of the spindle position is to adjust the speed of the oil pump of the spindle position to R2. , F1 is the tension value when the tension of the tow at this spindle position does not change, F2 is the current value of the tension of the tow at this spindle position, and R1 is the rotation speed of the oil pump when the tension of the tow at this spindle position does not change.

6. A POY yarn production process according to claim 1, characterized in that: The method for handling abnormal silk separation for these two spindle positions is the same, specifically: first determine whether the yarn bundle of the spindle position is less than 1.5kg in the machine weight. If not, the spindle position is manually restored, and after it is fully wound, the product of the spindle position with mis-separated silk is downgraded; otherwise, it is manually restored, and the spinning position is switched immediately after the restoration.

7. A POY yarn production process according to claim 1, characterized in that: All spindles are handled for abnormal speed, that is, the yarn bundles of all spindles are cut off, spinning is stopped at all spindles, all process parameters are checked to be accurate, and then production is resumed.

8. A POY yarn production process according to any one of claims 1 to 7, characterized in that: The specifications of POY yarn are that the thickness of single yarn is between 50D-200D, the number of yarn roots is between 48-144F, the oiling abnormality unqualified rate calculated within the sampling period of 20 days does not exceed 0.50%, the silk splitting abnormality unqualified rate calculated within the actual longest silk splitting abnormal time of 2 days does not exceed 0.6%, and the speed abnormality unqualified rate calculated within the actual longest speed abnormal time of 1.5 days does not exceed 3%.

Images