Method for increasing entanglement strength of interlaced multifilament

Abstract

The objective of the present invention is to provide a method for increasing the interlace strength of interlace multifilaments. The method for increasing the interlace strength of interlace multifilaments is as follows: by DTY technology, multifilaments are sequentially subjected to initial tension by a tension adjuster, sandwiched by a feed roller and introduced into a yarn guide tube, sandwiched by a guide roller and drawn out, and taken up by a take-up roller to become an interlace yarn; in which, a line passing through the pinching point of the feed roller and the pinching point of the guide roller overlaps with the central axis of the yarn guide tube, and the speed of the feed roller and the guide roller is the same; when the multifilaments pass through the yarn guide tube of the nozzle, compressed air is intermittently injected into the yarn guide tube A and the yarn guide tube B by the nozzle I and the nozzle II, respectively, and the input air pressure of the nozzle I is greater than the input air pressure of the nozzle II. The interlace yarn of the present invention has a high interlace strength and is not easily loosened, so that the weaving process is simplified so that twisting and sizing processes are not required.

Description

Technical Field

[0001] The present invention belongs to the field of spinning technology, and particularly relates to a method for enhancing the entanglement strength of interlaced multifilaments.

Background Art

[0002] Interlace processing is a widely applied and mature technology in chemical fiber manufacturing, with high practicality and potential. As a method for efficiently enhancing the bundling property of filaments without performing a twisting or sizing process, interlace processing can simplify the weaving process of filaments. Regarding the current interlace processing technology, high-pressure airflows are blown onto the filaments introduced into the interlacer through nozzles. The high-pressure airflows form vortices inside the yarn path tube to entangle the single filaments of the filaments and form knots. The factors affecting the entanglement strength of the filaments usually include the pressure of compressed air and the processing speed. Although the entanglement strength can be improved by optimizing the pressure of compressed air and the processing speed, when the obtained interlace yarns are subjected to the friction between the heddles and reeds of a loom, there is still a risk of loosening at the entanglement part, resulting in a decrease in weaving quality.

Summary of the Invention

Problems to be Solved by the Invention

[0003] In view of the deficiencies of the prior art, the present invention provides a method for enhancing the entanglement strength of interlaced multifilaments, that is, using a novel nozzle. In the novel nozzle, airflows incident from two injection ports form vortices in different directions inside the yarn path tube to entangle the single filaments of the filaments in different directions. Thereby, the knots of the yarns become stable, the entanglement strength increases, the entanglement loosening decreases, and the weaving quality of the yarns improves.

Means for Solving the Problems

[0004] The proposal of the present invention for achieving the above object is as follows. A method for increasing the entanglement strength of an interlace multifilament using a DTY spinning process, Grasp the non-interlaced multifilament with the tension adjusted by a tenser by means of a feed roller and a feed roll, pass it through the yarn path of a nozzle, grasp and draw it out by means of a draw roller and a draw roll, and form the interlace multifilament by winding it with a winding roller. The nozzle is formed by processing a cubic structure (the material is a metal material). In the cubic structure, surface a and surface a', surface b and surface b', and surface c and surface c' are parallel to each other respectively. The processing means forming grooves w, v, and u penetrating surface b and surface b' on surface c. Connect surface a and surface a', pass through grooves w, v, and u, and form a through hole serving as the yarn path of the nozzle. The yarn path between groove w and groove v is defined as yarn path A. The yarn path between groove v and groove u is defined as yarn path B. Form a hole x on surface b that communicates with yarn path A and whose connection surface with yarn path A completely enters the side wall of yarn path A. Form a hole y on surface b' that communicates with yarn path B and whose connection surface with yarn path B completely enters the side wall of yarn path B. The central axes of both hole x and hole y are skew perpendicular to the central axis of the yarn path. The projection lines of the central axes of hole x and hole y onto the cross-section of the yarn path are parallel to each other and symmetric with respect to the center point of the cross-section. Hole x is the nozzle I of yarn path A, and hole y is the nozzle II of yarn path B. The line connecting the gripping point between the feed roller and the feed roll and the gripping point between the draw roller and the draw roll overlaps with the central axis of the yarn path. The feed roller and the draw roller have the same linear velocity. When the multifilament passes through the yarn path of the nozzle, compressed airflows are intermittently ejected from nozzle I and nozzle II into yarn paths A and B respectively (that is, in yarn path A, after the multifilament receives the interleaving action of the airflow ejected from nozzle I, in yarn path B, the multifilament receives the interleaving action of the airflow ejected from nozzle II). The time for ejecting the airflow from nozzle I into yarn path A is t 1 Let it be, after Δt has elapsed, the airflow is ejected from nozzle II into yarn path B, and the ejection time is t 2 Let it be, t 1 and t 2 are the same, △t = d / v, where d is the horizontal distance between the central axis of nozzle I and the central axis of nozzle II, and v is the linear velocity of the take-up roller. A method is provided in which the pressure of the airflow ejected from nozzle I into yarn path A is greater than the pressure of the airflow ejected from nozzle II into yarn path B.

[0005] In principle, in an interlaced yarn, when the monofilaments originally parallel are separated into a plurality of bulky fibrillation parts when receiving the impact force of the airflow of the nozzle, and the parts between them are entangled with each other by the vortex flow to form knots, that is, the interlaced parts. There are usually two indicators for evaluating the interlaced yarn. The first is the interlace number N which refers to the number of interlaced parts per unit length (m), and the second is the interlace strength S defined as Nr / N, where Nr is the residual interlace number after applying a load of 132 mN / tex to the yarn per unit length for 3 minutes. The evaluation method is to be carried out according to the "Method for Measuring the Interlace Number of Synthetic Fibers" of the Chinese industrial standard FZ / T 50001-2005.

[0006] The principle of the present invention is as follows.

[0007] The biggest factor in generating the interlaced yarn is the entanglement of the single filaments of the multifilament caused by the airflow in the yarn path tube. Therefore, the movement direction of the yarn follows the swirling direction of the air. For the interlaced yarns in the prior art, since the interlacing directions of the single filaments are almost the same, the interlacing strength of the yarn is low and there is interlacing loosening during weaving.

[0008] In the present invention, first, the line passing through the clamping point of the feed roller and the clamping point of the guide roller overlaps with the central axis of the yarn path tube. By making the linear speeds of the feed roller and the guide roller the same, overfeeding between the feed roller and the guide roller is prevented, ensuring that the multifilament is positioned on the central axis of the yarn path tube. Next, two injection ports are provided on both sides of the nozzle. Furthermore, since both injection ports are located at the helical position of the central axis of the yarn path tube, the air vortex mainly blows the single filaments outside the multifilament to wind the single filaments around the fiber axis. More specifically, injection port I is located above the central axis of yarn path tube A and injection port II is located below the central axis of yarn path tube B. Therefore, the vortex in yarn path tube A is opposite to the vortex in yarn path tube B and they do not affect each other due to the division of groove v. Thus, while the entanglement portions formed in yarn path tube A and the entanglement portions formed in yarn path tube B have opposite entanglement directions, when the single filaments hit the opposite vortices, firmer knots can be formed and the entanglement strength is increased. Additionally, the present invention controls to make the incident air flow pressure of injection port I higher. Therefore, when the entanglement portion formed in yarn path tube A hits the opposite vortex with a weaker strength in yarn path tube B, the entanglement direction does not change much and the entanglement becomes stronger. That is, the interlaced yarn in the present invention has a high entanglement strength and is not easily loosened during weaving.

[0009] Preferably, in the method for increasing the entanglement strength of the interlaced yarn, the diameter of the yarn path tube is 2.5 - 3 mm, the injection ports I and II have the same structure and a diameter of 0.5 - 1 mm, the distance between the projection line of the central axis of the hole x on the cross-section of the yarn path tube and the center point of the cross-section is 0.5 - 0.8 mm; the pressure of the air flow incident from the injection port I into the yarn path tube A is 0.1 - 0.3 MPa, the pressure of the air flow incident from the injection port II into the yarn path tube B is 0.05 - 0.08 MPa; the value range of d is 18 - 20 mm, the value range of v is 30 - 50 m / s; the initial tension is 0.01 - 0.05 N (since the multifilament in the yarn path tube is in a stretched state due to the presence of the feed roller and the guide roller, a single yarn with too large an initial tension is difficult to entangle); t1 is 0.1 - 0.3 ms; the specification of the multifilament is 3 - 15 tex / 10 - 40 F, the interlaced yarn is composed of a plurality of cycle segments along the longitudinal direction, and any cycle segment is composed of an opening part and an entanglement part connected in sequence; the entanglement strength of the interlaced yarn is 97 - 99%.

Advantages of the Invention

[0010] The advantages of the present invention are as follows: 1. The obtained interlaced yarn has a high entanglement strength and is difficult to loosen, so the weaving process is simplified so that the twisting and sizing processes are not required. 2. The processing of the used interlaced nozzle is convenient, easy to implement, and has a wide applicability.

Brief Description of the Drawings

[0011]

Figure 1

Figure 2

Embodiments for Carrying Out the Invention

[0012] Hereinafter, the present invention will be described in more detail with reference to examples. However, the present invention is not limited to the following examples as long as the gist thereof is not exceeded. Even if those skilled in the art who have read the content of the present invention are allowed to modify various aspects of the present invention, it is also limited within the scope of the claims of the present invention as an equivalent form of the present invention.

[0013] Example 1 The nozzle for increasing the entanglement strength of the interlace yarn has the following structure: As shown in Figure 2, the nozzle is a cube of processed metal material. In the described cube, surface a and surface a', surface b and surface b', and surface c and surface c' are parallel to each other respectively; the described processing means digging grooves w, v, and u that penetrate surface b and surface b' from surface c, opening through holes with a diameter of 2.3 - 3 mm from surface a to surface a', and the through holes pass through the grooves, groove w, and groove u to form a yarn passage tube. The part between groove w and groove v in it is called yarn passage tube A6, and the part between groove v and groove u is called yarn passage tube B7; from surface b, a hole x is opened to yarn passage tube A, and from surface b', a hole y is opened to yarn passage tube B; the central axis of hole x and the central axis of hole y are in a helical position with respect to the central axis of the yarn passage tube. The projection lines of the central axis of hole x and the central axis of hole y on the cross-section of the yarn passage tube are parallel to each other and symmetric with respect to the center point of the cross-section; hole x becomes the injection port I of yarn passage tube A and hole y becomes the injection port II of yarn passage tube B; injection port I and injection port II have the same structure and a diameter of 0.5 - 1 mm, and the distance between the projection line of the central axis of hole x on the cross-section of the yarn passage tube and the center point of the cross-section is 0.5 - 0.8 mm.

[0014] Example 2 The method for increasing the entanglement strength of the interlace multifilament is as follows: (1) Prepare 25 tex / 40F polyester POY of a standard as raw material A; (2) By the DTY technology, the multifilament of raw material A1 is sequentially subjected to an initial tension by a tension adjuster 2 as shown in Fig. 1, sandwiched between a feed roller 3 and a feed rubber roller 4, and introduced into the yarn passage tube of a nozzle 5 (the structure is shown in Example 1), sandwiched between a guide roller 8 and a guide rubber roller 9 and drawn out, and wound by a take-up roller 10 to become an interlaced yarn of a standard 15 tex / 40 F; among them, the line passing through the sandwiching point of the feed roller and the sandwiching point of the guide roller overlaps with the central axis of the yarn passage tube, and the speeds of the feed roller and the guide roller are the same; when the multifilament passes through the yarn passage tube of the nozzle, compressed air is intermittently incident into the yarn passage tube A and the yarn passage tube B by the injection port I and the injection port II respectively (that is, the multifilament is sequentially subjected to the intersection action of the airflows of the injection port I of the yarn passage tube A and the injection port II of the yarn passage tube B). Specifically, airflow is incident into the yarn passage tube from the injection port I over a time t1, and after a time Δt, the airflow injection into the yarn passage tube B of the injection port II starts, and the injection time is set as t2; furthermore, t1 and t2 are the same, and △t = d / v, where d is the distance between the central axes of the injection port I and the injection port II, and v is the linear velocity of the guide roller; the incident airflow pressure of the injection port I is greater than that of the injection port II; specifically, regarding the process parameters and the dimensions of the nozzle, the initial tension is 0.05 N, the diameter of the yarn passage tube is 3 mm, the diameter of the injection port is 1 mm, t1 is 0.3 ms, d is 18 mm, v is 35 m / s, the pressure of the airflow incident from the injection port I into the yarn passage tube A is 0.3 MPa, the pressure of the airflow incident from the injection port II into the yarn passage tube B is 0.05 MPa; The obtained interlaced yarn is composed of a plurality of cycle segments along the longitudinal direction, and any cycle segment is composed of an open fiber part and an intersection part connected in sequence; the intersection strength of the interlaced yarn is 99%.

[0015] Example 3 The method for increasing the intersection strength of the interlaced multifilament is as follows: (1) Prepare 17 tex / 30 F polyester POY of the specification as raw material A; (2) By DTY technology, the multifilament of raw material A1 is, as shown in Fig. 1, sequentially subjected to an initial tension by a tension adjuster 2, sandwiched between a feed roller 3 and a feed rubber roller 4, and introduced into a yarn passage tube of a nozzle 5 (the structure is shown in Example 1), sandwiched between a guide roller 8 and a guide rubber roller 9 and drawn out, and wound by a take-up roller 10 to form an interlaced yarn of 10 tex / 40 F of the specification; among them, the line passing through the sandwiching point of the feed roller and the sandwiching point of the guide roller overlaps with the central axis of the yarn passage tube, and the speeds of the feed roller and the guide roller are the same; when the multifilament passes through the yarn passage tube of the nozzle, compressed air is intermittently incident into yarn passage tube A and yarn passage tube B respectively through injection port I and injection port II (that is, the multifilament is sequentially subjected to the intersection action of the airflows of injection port I of yarn passage tube A and injection port II of yarn passage tube B). Specifically, airflow is incident into the yarn passage tube from injection port I over a time of t1 hours, and after a time Δt, the airflow injection into yarn passage tube B of injection port II begins, and the injection time is set as t2; furthermore, t1 and t2 are the same, △t = d / v, d is the distance between the central axes of injection port I and injection port II, and v is the linear velocity of the guide roller; the incident airflow pressure of injection port I is greater than that of injection port II; specifically, regarding the process parameters and the dimensions of the nozzle, The initial tension is 0.01 N, The diameter of the yarn passage tube is 2.5 mm, The diameter of the injection port is 0.5 mm, t1 is 0.2 ms, d is 20 mm, v is 50 m / s, The pressure of the airflow incident from injection port I into yarn passage tube A is 0.1 MPa, The pressure of the airflow incident from injection port II into yarn passage tube B is 0.08 MPa; The obtained interlaced yarn is composed of a plurality of cycle segments along the longitudinal direction, and any cycle segment is composed of an opening fiber part and an intersection part connected in sequence; the intersection strength of the interlaced yarn is 97%.

[0016] Example 4 The method for increasing the entanglement strength of an interlace multifilament is as follows: (1) Prepare 20 tex / 35F polyester POY of the standard as raw material A; (2) By means of DTY technology, the multifilament of raw material A1 is, as shown in FIG. 1, sequentially subjected to an initial tension by a tension adjuster 2, sandwiched between a feed roller 3 and a feed rubber roller 4, and introduced into a yarn path tube of a nozzle 5 (the structure is shown in Example 1), sandwiched between a guide roller 8 and a guide rubber roller 9, pulled out, and wound by a take-up roller 10 to form an interlace yarn of 12 tex / 35F of the standard; among them, the line passing through the sandwiching point of the feed roller and the sandwiching point of the guide roller overlaps with the central axis of the yarn path tube, and the speeds of the feed roller and the guide roller are the same; when the multifilament passes through the yarn path tube of the nozzle, compressed air is intermittently injected into the yarn path tube A and the yarn path tube B by the injection port I and the injection port II respectively (that is, the multifilament is sequentially subjected to the entanglement action of the airflows of the injection port I of the yarn path tube A and the injection port II of the yarn path tube B). Specifically, air is injected into the yarn path tube from the injection port I over a time t1, and after a time Δt, the air injection into the yarn path tube B of the injection port II starts, and the injection time is set as t2; furthermore, t1 and t2 are the same, △t = d / v, d is the distance between the central axes of the injection port I and the injection port II, and v is the linear velocity of the guide roller; the incident air pressure of the injection port I is greater than the incident air pressure of the injection port II; specifically, for the process parameters and the dimensions of the nozzle, the initial tension is 0.01 N, the diameter of the yarn path tube is 3 mm, the diameter of the injection port is 0.5 mm, t1 is 0.1 ms, d is 20 mm, v is 50 m / s, the pressure of the air incident from the injection port I into the yarn path tube A is 0.1 MPa, the pressure of the air incident from the injection port II into the yarn path tube B is 0.08 MPa; The obtained interlace yarn is composed of a plurality of cycle segments along the longitudinal direction, and any cycle segment is composed of an opening fiber part and an entanglement part connected in sequence; the entanglement strength of the interlace yarn is 98%.

[0017] Example 5 The method for increasing the entanglement strength of an interlace multifilament is as follows: (1) Polyester POY with a standard of 14 tex / 20 F is prepared as raw material A; (2) By DTY technology, the multifilament of raw material A1 is successively subjected to an initial tension by a tension adjuster 2 as shown in Fig. 1, sandwiched between a feed roller 3 and a feed rubber roller 4, and introduced into the yarn path tube of a nozzle 5 (the structure is shown in Example 1), sandwiched between a guide roller 8 and a guide rubber roller 9, pulled out, and wound by a take-up roller 10 to form an interlace yarn with a standard of 8 tex / 20 F; among them, the line passing through the sandwiching point of the feed roller and the sandwiching point of the guide roller overlaps with the central axis of the yarn path tube, and the speeds of the feed roller and the guide roller are the same; when the multifilament passes through the yarn path tube of the nozzle, compressed air is intermittently injected into the yarn path tube A and the yarn path tube B by the injection port I and the injection port II respectively (that is, the multifilament is successively subjected to the entanglement action of the airflows of the injection port I of the yarn path tube A and the injection port II of the yarn path tube B). Specifically, air is injected into the yarn path tube from the injection port I over a time of t1 hours, and after a time Δt, the air injection into the yarn path tube B of the injection port II starts, and the injection time is set as t2; furthermore, t1 and t2 are the same, and △t = d / v, where d is the distance between the central axes of the injection port I and the injection port II, and v is the linear velocity of the guide roller; the incident air pressure of the injection port I is greater than that of the injection port II; specifically, regarding the process parameters and the dimensions of the nozzle, the initial tension is 0.05 N, the diameter of the yarn path tube is 2.5 mm, the diameter of the injection port is 1 mm, t1 is 0.3 ms, d is 18 mm, v is 30 m / s, the pressure of the air incident from the injection port I into the yarn path tube A is 0.3 MPa, the pressure of the air incident from the injection port II into the yarn path tube B is 0.05 MPa; The obtained interlaced yarn is composed of a plurality of cycle segments along the longitudinal direction, and any cycle segment is composed of an opening part and an entanglement part that are sequentially connected; the entanglement strength of the interlaced yarn is 99%.

[0018] Comparative Example 1 The interlacing processing method is almost the same as that of Example 2, and the difference is only that compressed air does not enter through injection port II. The entanglement strength of the obtained interlaced yarn is 87%. Comparing Comparative Example 1 with Example 2, it can be seen that the entanglement strength of Comparative Example 1 decreases. The reason is that compressed air does not enter through injection port II, and the multifilament only receives the action of the compressed air entering through injection port I, and its entanglement strength is at the same level as the entanglement strength in the prior art.

[0019] Comparative Example 2 The interlacing processing method is almost the same as that of Example 2, and the difference is only that the pressure of the compressed air entering through injection port I is set to 0.3 MPa, which is the same as the pressure of the compressed air entering through injection port II. The entanglement strength of the obtained interlaced yarn is 82%. Comparing Comparative Example 2 with Example 2, it can be seen that the entanglement strength of Comparative Example 2 decreases. The reason is that when the pressure of the compressed air entering through injection port I is the same as the pressure of the compressed air entering through injection port II, the two airflows have opposite directions and the same pressure. Therefore, the airflow at injection port II gives a relatively strong untwisting effect to the entanglement formed by injection port I, reducing the entanglement strength of the yarn.

[0020] Comparative Example 3 The interlacing processing method is almost the same as that of Example 2, and the difference is only that the nozzle used is different from the nozzle shown in Example 1, that is, the distance between the projection line of the central axis of holes x and y on the cross-section of the yarn duct and the center point of the cross-section is set to 0. The entanglement strength of the obtained interlaced yarn is 83%. Comparing Comparative Example 3 with Example 2, it can be seen that the entanglement strength of Comparative Example 3 decreases. The reason is that when the air flow directions of both the injection port I and the injection port II are directly facing the central axis of the yarn duct, the air flow directly reaches the central axis of the yarn and further diffuses to both sides, resulting in a weaker and more unstable vortex, so the entanglement of the yarn decreases and the entanglement strength decreases.

[0021] Comparative Example 4 The interlacing processing method is almost the same as that of Example 2. The difference is that the nozzle used is different from the nozzle shown in Example 1, that is, the projection lines of the central axes of the holes x and y on the cross-section of the yarn duct are parallel to each other and not symmetric about the center point of the cross-section, and the distance between the projection line of the central axis of the hole x on the cross-section of the yarn duct and the center point of the cross-section is set to 0, and only the distance between the projection line of the central axis of the hole y on the cross-section of the yarn duct and the center point of the cross-section is the same as the distance in Example 1. The entanglement strength of the obtained interlaced yarn is 88%. Comparing Comparative Example 4 with Example 2, it can be seen that the entanglement strength of Comparative Example 4 decreases. The reason is that when the air flow of the injection port I is directly facing the central axis of the yarn and the air flow of the injection port II is directed to the side of the yarn, the action of the air flow with higher pressure at the injection port I reaches the central axis of the yarn and a weaker vortex is formed, so the entanglement strength decreases.

[0022] Comparative Example 5 The interlacing processing method is almost the same as that of Example 2. The difference is that the nozzle used is different from the nozzle shown in Example 1, that is, the projection lines of the central axes of the holes x and y on the cross-section of the yarn duct are parallel to each other and not symmetric about the center point of the cross-section, and the distance between the projection line of the central axis of the hole x on the cross-section of the yarn duct and the center point of the cross-section is the same as the distance in Example 1, and only the distance between the projection line of the central axis of the hole y on the cross-section of the yarn duct and the center point of the cross-section is set to 0. The entanglement strength of the obtained interlaced yarn is 90%. Comparing Comparative Example 5 with Example 2, it can be seen that the entanglement strength of Comparative Example 5 decreases. The reason is that when the air flow from nozzle I is directed to the side of the yarn and the air flow from nozzle II is facing the central axis of the yarn, although the working mechanism is similar to that of Comparative Example 4, nozzle I can form a stronger vortex than nozzle II, so Comparative Example 5 can obtain a higher entanglement strength than Comparative Example 4.

[0023] Comparative Example 6 The interlacing method is almost the same as that of Example 2, and the difference is that the nozzle used is different from the nozzle shown in Example 1, that is, only holes x and y are formed by plane b. The entanglement strength of the obtained interlaced yarn is 92%. Comparing Comparative Example 6 with Example 2, it can be seen that the entanglement strength of Comparative Example 6 decreases. The reason is that when the directions of the air flow from nozzle I and the air flow from nozzle II are the same, there is no twisting action of the counteracting air flow, so the entanglement strength of the yarn decreases.

Claims

1. A method for increasing the entanglement strength of an interlaced multifilament using a DTY spinning process, comprising: Gripping a non-interlaced multifilament with adjusted pretension by a tenser, passing it through the yarn path of a nozzle by a feed roller and a feed roll, pulling it out by gripping with a draw roller and a draw roll, and winding the interlaced multifilament by a winding roller to form; The nozzle is formed by processing a rectangular parallelepiped structure, in which surface a and surface a', surface b and surface b', and surface c and surface c' are parallel to each other respectively; The processing means forming grooves w, v, and u penetrating through surface b and surface b' on surface c; Connecting surface a and surface a', passing through grooves w, v, and u, and forming a through hole serving as the yarn path of the nozzle; The yarn path between groove w and groove v is defined as yarn path A; The yarn path between groove v and groove u is defined as yarn path B; Forming a hole x on surface b that communicates with yarn path A and whose connection surface with yarn path A completely enters the side wall of yarn path A; Forming a hole y on surface b' that communicates with yarn path B and whose connection surface with yarn path B completely enters the side wall of yarn path B; The central axis of hole x and the central axis of hole y are both skew perpendicular to the central axis of the yarn path, the projection lines of the central axes of hole x and hole y on the cross-section of the yarn path are parallel to each other, hole x is the nozzle I of yarn path A, and hole y is the nozzle II of yarn path B; The line connecting the gripping point between the feed roller and the feed roll and the gripping point between the draw roller and the draw roll overlaps with the central axis of the yarn path, and the feed roller and the draw roller have the same linear velocity; When the multifilament passes through the yarn path of the nozzle, compressed airflows are intermittently ejected from the nozzles I and II into the yarn paths A and B respectively, and the time for ejecting the airflow from the nozzle I into the yarn path A is t １ Let it be so. After Δt has elapsed, the airflow is ejected from the nozzle II into the yarn path B, and the ejection time is t ２ Let it be so. t １ and t ２ are the same, and △t = d / v, where d is the horizontal distance between the central axis of the nozzle I and the central axis of the nozzle II, and v is the linear velocity of the take-up roller The pressure of the air flow ejected from nozzle I into yarn path A is greater than the pressure of the air flow ejected from nozzle II into yarn path B A method for increasing the entanglement strength of an interlaced multifilament, characterized by the above.

2. The pressure of the air flow ejected from nozzle I into yarn path A is 0.1 to 0.3 MPa; The pressure of the air flow ejected from nozzle II into yarn path B is 0.05 to 0.08 MPa A method for increasing the entanglement strength of an interlaced multifilament according to Claim 1, characterized by the above.

3. The range of d is 18 to 20 mm; The range of v is 30 to 50 m / s A method for increasing the entanglement strength of an interlaced multifilament according to Claim 1, characterized by the above.

4. The pretension is 0.01 to 0.05 N A method for increasing the entanglement strength of an interlaced multifilament according to claim 1, characterized in that...

5. t １ is 0.1 to 0.3 ms A method for increasing the entanglement strength of an interlaced multifilament according to claim 1, characterized in that...

6. The specification of the interlaced multifilament is 3 to 15 tex / 10 to 40 F A method for increasing the entanglement strength of an interlaced multifilament according to claim 1, characterized in that...

7. The interlaced multifilament is composed of a plurality of cycle segments continuous in the longitudinal direction, each cycle segment consisting of an opening part and an entanglement part connected in sequence, A method for increasing the entanglement strength of an interlaced multifilament according to claim 1, characterized in that...

8. The entanglement strength of the interlaced multifilament is 97 to 99% A method for increasing the entanglement strength of an interlaced multifilament according to claim 1, characterized in that...

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