High productivity air-laid web forming apparatus for multi-gauge fiber stable high strength web formation

Abstract

The application discloses a high-yield air-laying device for stably generating high-strength fiber web with multi-specification fibers, and relates to the technical field of air-laying equipment in non-woven fabric machinery. By using the application, the fibers are first subjected to carding and fully stretched into single fibers, and then high-speed air-laying is performed in a web forming air duct with sufficient conveying space and adjustable width by means of the cooperation of a compressed air flow and a suction air flow, so that a high-strength fiber web with uniformity, thickness, and a longitudinal and transverse strength ratio close to 1:1 and a maximum gram weight of 500 g / m2 is finally stably and reliably and efficiently generated, the quality and uniformity of the web surface are obviously improved, the yield of the air-laying is significantly improved, meanwhile, technical problems such as static electricity and high temperature generated during carding of the fibers are effectively solved, the production uncertainty is greatly reduced, the production reliability and stability are improved, the limitation of spinnable fibers is broken, the application range is expanded, and the universality is enhanced.

Description

Technical Field

[0001] This invention relates to the technical field of airflow web forming equipment in nonwoven machinery, and more specifically to a high-yield airflow web forming device for the stable generation of high-strength fiber webs from multi-specification fibers. It is particularly suitable for use with various carding machine bodies to form a carding-type airflow web forming machine, which can generate uniform, thick, high-strength fiber webs with a longitudinal-to-transverse strength ratio close to 1:1 and a maximum weight of up to 500g / m². Background Technology

[0002] Currently, carded air-jet web forming machines used in the production of spunlace and needle-punched nonwoven fabrics in domestic and international markets are mainly used to produce high-strength fiber webs with a basis weight of 35–500 g / m² and a warp-to-wave strength ratio close to 1:1. This type of machine originally had two web forming modes: the first mode involves direct air-jet web forming of fibers on the cylinder (such as the foreign model K12, see...). Figure 4 The second web-forming mode involves the fibers being stretched into extended single fibers by high-speed airflow rollers and a fixed cover plate after carding (see...). Figure 5 Both the high-speed airflow roller and the fixed cover plate are covered with needle cloth, and then the airflow forms a web on the high-speed airflow roller.

[0003] The first type of web-forming method uses an airflow combination of feeding, carding unit, cylinder carding, and blowing / suction to form the web. The advantages of this method are its simple structure and low cost. However, because the carding is insufficient, the fibers exhibit various shapes during carding—straight, vertical, and curled—resulting in the fibers not forming fully extended single fibers in the final web. This leads to drawbacks such as low yield and poor web uniformity.

[0004] The fibers in the second type of web forming mode have undergone sufficient combing and stretching, resulting in fully extended single fibers at the final web formation. Therefore, the advantage of this second type of web forming mode is that it can effectively improve output and web uniformity. The disadvantage of the second type of web forming mode is that the distance between the fixed cover plate and the high-speed airflow roller is very small, and the long arc surface covering mode causes problems such as static electricity and high temperature when the fibers flow, resulting in great production uncertainty. For this reason, the airflow web forming machine of the second type of web forming mode is not suitable for pure polyester or high proportion polyester. The suitable fibers are only pure viscose, viscose + low proportion antistatic polyester, raw cotton and degreased cotton, etc., which has a large limitation on the suitable fibers. At the same time, due to the aforementioned production uncertainty and the limitation of suitable fibers, the airflow web forming machine has extremely high requirements for temperature and humidity in the production workshop. During production, the temperature and humidity of the workshop must be strictly controlled to prevent deviations, so its production reliability is insufficient. Summary of the Invention

[0005] The purpose of this invention is to address the shortcomings of the existing technology by providing a high-yield airflow web-forming device for the stable generation of high-strength fiber webs from multiple fiber specifications. Using this invention, it is possible to stably, reliably, and efficiently generate uniform, thick high-strength fiber webs with a longitudinal-to-transverse strength ratio close to 1:1 and a maximum basis weight of up to 500 g / m². The web surface quality and uniformity are significantly improved, and the output of airflow web-forming is significantly increased. Simultaneously, it effectively solves technical problems such as static electricity and high temperatures generated during fiber combing, greatly reducing production uncertainties, improving production reliability and stability, breaking the limitations of suitable fibers, expanding the scope of application, and enhancing versatility.

[0006] The objective of this invention can be achieved through the following technical solutions: The high-yield airflow web forming device of the present invention for the stable generation of high-strength fiber webs from multi-specification fibers includes a high-speed airflow roller (on the one hand, the high-speed rotating high-speed airflow roller cooperates with the ultra-low-speed combing roller to generate relative motion, which can simply comb the fibers that have been combed in the combing zone and fully stretch them into fully extended, parallel single fibers, laying a good foundation for improving the quality and yield of the subsequent airflow web forming; on the other hand, the high-speed airflow roller generates a strong centrifugal force when rotating at high speed, which can help to smoothly throw most of the fibers off the high-speed airflow roller), and high-speed rotating high-speed rollers are arranged in a gap and tangential manner in front of the high-speed airflow roller. The system includes a transfer roller (whose main function is to transfer the combed fibers from the combing zone to the high-speed airflow roller), two combing rollers positioned above the high-speed airflow roller (which, when rotating clockwise, work with the high-speed airflow roller to comb and stretch the fibers; when rotating counterclockwise, excess fibers hooked on the combing roller are carried away by the high-speed airflow roller and enter the next round of combing, preventing fiber entanglement), and an arc-shaped plate I to the upper right, an arc-shaped plate II above, an arc-shaped plate III to the upper left, a drain bottom I to the lower left, and a drain bottom II below (the aforementioned arc-shaped plates and drain bottoms form a seal with the high-speed airflow roller, ensuring the fibers pass through the high-speed airflow roller). When the airflow roller operates between the high-speed transfer roller and between the high-speed airflow roller and the combing roller, it can be firmly controlled on the outer circumference of the high-speed airflow roller, preventing the overflow of fly wool, thereby improving the web production and web surface uniformity. The cotton stripping knife fixed on the right end face of the bottom plate II can remove fibers that have not been completely removed from the high-speed airflow roller, preventing them from re-entering the high-speed airflow roller for circulation and combing. The pressure roller and the bow-shaped expansion plate are arranged in an intermittent manner to the right of the high-speed airflow roller and are hinged together from bottom to top. On the one hand, the pressure roller cooperates with the support roller to clamp the breathable web curtain from top to bottom; on the other hand, the pressure roller provides the mounting base for the bow-shaped expansion plate; at the same time, the pressure roller presses the web. The web roller linkage adjustment mechanism can move left and right under the push and pull action, driving the bow-shaped expansion plate to move synchronously, thereby changing the width of the airflow web forming channel to adapt to the web forming requirements of different fiber specifications and thicknesses. The airflow web forming channel is formed by the left side of the bow-shaped expansion plate and the right side of the arc plate I, the high-speed airflow roller, and the cotton stripping knife, which is wide at the top and bottom and narrow in the middle. (The airflow web forming channel in this invention is designed to be wide at the top and bottom and narrow in the middle, so that the airflow and fiber encounter resistance at the top of the airflow web forming channel and change direction, thereby forming the fiber into an isotropic three-dimensional state, which is the key factor in forming a high-strength fiber web with a longitudinal and transverse strength ratio close to 1:1.)After passing the narrowest part of the airflow web-forming channel and reaching the wider lower part, with the assistance of the negative pressure suction airflow, the airflow carrying the isotropic fibers no longer deviates in direction, and the fibers can fall smoothly onto the breathable mesh curtain along the direction of the negative pressure airflow. The blowing system (which provides blowing airflow for the fibers to be separated from the high-speed airflow roller) is connected to the upper inlet of the airflow web-forming channel at the outlet end. It is composed of the upper suction air duct and the lower suction air duct, with the inlet end facing and connected to the lower outlet of the airflow web-forming channel. The suction duct is connected to the negative pressure suction system (serving as a connecting channel between the airflow web formation channel and the negative pressure suction system). A support roller is positioned below the pressing roller (on one hand, the support roller and the four corner turning rollers jointly support the breathable mesh curtain; on the other hand, the support roller cooperates with the pressing roller to clamp the breathable mesh curtain from top to bottom). A breathable mesh curtain is looped around the support roller and the four corner turning rollers (the breathable mesh curtain circulates along the support roller and the four corner turning rollers, used to transfer the high-strength fiber web generated by the high-yield airflow to the next workstation). The left side of the bow-shaped expansion plate is processed into a structure with a chamfered top and a rounded bottom, forming a shape that is curved at both ends and bulging in the middle (thus, the airflow web-forming channel formed between the left side of the bow-shaped expansion plate, the arc-shaped plate I, the high-speed airflow roller, and the right side of the cotton stripping knife forms a cavity that is wide at the top and bottom and narrow in the middle). A channel width adjustment linkage is hinged to the upper middle part of the bow-shaped expansion plate (the bow-shaped expansion plate can be rotated around the pressure roller as the axis under the pushing and pulling action of the channel width adjustment linkage, thereby adjusting the overall width and capacity of the airflow web-forming channel to meet different specifications). To accommodate different fiber thicknesses in web formation, a pressing roller linkage adjustment mechanism is connected to the right side of the pressing roller (the pressing roller can move left and right under the pushing and pulling action of the pressing roller linkage adjustment mechanism to adapt to the displacement of the bow-shaped expansion plate). A supporting roller linkage adjustment mechanism is connected to the right side of the supporting roller to adjust the web width by pushing the supporting roller left and right (the supporting roller can move left and right under the pushing and pulling action of the supporting roller linkage adjustment mechanism to change the width of the upper suction duct, and together with the position adjustment of the pressing roller, adjust the web width).

[0007] The blowing system described in this invention consists of a blowing box, two blowing fans arranged symmetrically on the left and right, which are connected in parallel to blowing hose I and blowing hose II through a three-way pipe, and then connected to the inlet end of the blowing box through their respective square-to-round air inlet pipes I. It also consists of a blowing nozzle connected between the outlet end of the blowing box and the upper inlet of the airflow network channel (the inlet end of the blowing box is connected to the two blowing fans through four air inlet branches to provide sufficient blowing airflow for the fibers to be peeled off from the high-speed airflow roller). The blowing box has staggered and spaced air distribution plates (for uniform airflow) arranged inside the blowing box.

[0008] The negative pressure suction system described in this invention consists of two negative pressure suction fans arranged symmetrically on the left and right sides, which are connected to the outlet end of the main suction duct in parallel through square-to-round pipe II. The inlet end of the main suction duct is connected to the outlet end of the lower suction duct. (In this way, the airflow from the airflow meshing channel and the airflow passing through the upper suction duct, lower suction duct and main suction duct are simultaneously drawn from both sides by the two negative pressure suction fans. With the assistance of the negative pressure suction airflow, the direction of the airflow carrying the isotropic fibers no longer deviates when it reaches the wider part below the airflow meshing channel. The fibers can fall smoothly onto the breathable mesh curtain along the direction of the negative pressure airflow.)

[0009] The high-speed airflow roller described in this invention has a rotational speed greater than 4000 m / min (the higher the rotational speed of the high-speed airflow roller, the greater the centrifugal force generated, which facilitates more fibers to be smoothly thrown off the high-speed airflow roller with the help of centrifugal force during high production).

[0010] The operating speed of the combing roller described in this invention is 0.3 to 0.4 m / min (the high-speed airflow roller, which operates at an ultra-low speed, works in conjunction with the high-speed combing roller to generate relative motion, which can simply comb the fibers that have been combed in the combing zone and fully stretch them into fully extended, parallel single fibers). The combing roller can rotate in both directions and the rotation angle is adjustable (when the combing roller rotates clockwise, the high-speed airflow roller plays the role of combing the fibers; when the combing roller rotates counterclockwise, the high-speed airflow roller can remove the excess fibers hooked on the combing roller and enter the next round of combing, preventing tangling).

[0011] The top of the cotton stripping knife in this invention is machined with an arc shape that matches the roller surface of the high-speed airflow roller. The distance between the arc-shaped top of the cotton stripping knife and the roller surface of the high-speed airflow roller is 1mm (which can remove fibers that have not been completely removed from the high-speed airflow roller and prevent them from re-entering the high-speed airflow roller for circulation and combing).

[0012] In this invention, the right-side blocking plate of the upper suction duct can swing left and right as the position of the support roller moves (when the support roller moves left and right under the push and pull action of the support roller connecting rod adjustment mechanism, the right-side blocking plate of the upper suction duct swings left and right accordingly, while the left-side blocking plate of the upper suction duct remains fixed, thereby changing the width of the upper suction duct and thus adjusting the width of the net).

[0013] The design principle of this invention is as follows: This invention enables fibers to first be combed and fully stretched into fully extended single fibers, and then, within a sufficiently spacious and adjustable-width web-forming duct, undergo high-speed airflow web formation through the combined action of compressed and suction airflows. This results in a stable, reliable, and efficient production of a uniform, thick, high-strength fiber web with a longitudinal-to-transverse strength ratio approaching 1:1 and a maximum basis weight of 500 g / m². More specifically, the high-speed rotating high-speed airflow roller and the ultra-low-speed combing roller above it work together to simply comb the fibers already combed in the combing zone and fully stretch them into fully extended, parallel single fibers. Simultaneously, the arc-shaped plate and perforated bottom covering the circumference of the high-speed airflow roller ensure that the fibers remain sealed during operation, preventing leakage and fly waste. These two features guarantee excellent airflow web formation, significantly improved web quality, and a substantial increase in airflow web production. In this invention, a low-speed combing roller replaces the traditional fixed cover plate, working in conjunction with a high-speed airflow roller to form combing and stretching functions. This minimizes the area of ​​the carding cloth docking, effectively solving problems such as static electricity and high temperature generated when the fibers are combed at this position without affecting the function. It reduces the uncertainty of the production process, breaks the limitation of suitable fibers, and improves the reliability and stability of production. At the same time, the combing method of the combing roller combines the advantages of cover plate combing and roller combing, that is, it combines the advantages of easy processing of rollers and easy combing of cover plates, solving the processing problems and achieving full combing. The airflow web-forming channel in this invention is designed to be wider at the top and bottom and narrower in the middle. This design causes the airflow and fibers to encounter resistance at the upper part of the channel, changing their direction and resulting in an isotropic three-dimensional fiber web. This is a key factor in forming a high-strength fiber web with a longitudinal to transverse strength ratio close to 1:1. Beyond the narrowest part of the airflow web-forming channel, at the wider lower part, the airflow carrying the isotropic fibers no longer deviates in direction under the assistance of the negative pressure suction airflow. Following the direction of the negative pressure airflow, the fibers smoothly fall onto the breathable mesh curtain. Simultaneously, this invention features two high-power suction fans on both sides of the lower airflow channel. These fans effectively handle the airflow used to peel the fibers and the centrifugal airflow generated by the high-speed rotation of the airflow rollers, guiding the fibers to fall onto the mesh curtain along the direction of the negative pressure airflow. Therefore, the coordination of the compressed airflow from the blowing system and the suction airflow from the negative pressure suction system, along with the directional guidance of the negative pressure airflow, are key factors for high-yield and high-quality airflow web formation. Furthermore, the bow-shaped expansion plate, pressing roller, supporting roller, and upper suction duct in this invention can all be flexibly adjusted. That is, the width and capacity of the airflow web forming channel can be flexibly adjusted as needed, which can meet the production needs of different fiber varieties, different weights, and different yields, thus expanding the scope of application of this invention and enhancing its versatility and operational flexibility.

[0014] The beneficial technical effects of the present invention are as follows: This invention enables the stable, reliable, and efficient generation of uniform, thick high-strength fiber webs with a longitudinal-to-transverse strength ratio close to 1:1 and a maximum weight of 500 g / m². The quality and uniformity of the web surface are significantly improved, and the output of air-laid webs is significantly increased. At the same time, it effectively solves the technical problems of static electricity and high temperature generated during fiber combing, greatly reduces production uncertainty, improves production reliability and stability, breaks the limitations of suitable fibers, expands the scope of application, and enhances versatility. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of the present invention.

[0016] Figure 2 yes Figure 1 A diagram showing the direction of travel.

[0017] Figure 3 yes Figure 1 The diagram is shown in direction B.

[0018] Figure 4 This is a schematic diagram of the traditional representative structure (i.e., the airflow web structure K12 in which fibers are directly formed by airflow on the cylinder).

[0019] Figure 5 This is a schematic diagram of the traditional representative structure two (that is, after the fiber is combed, it is first stretched into an extended single fiber by a high-speed airflow roller and a fixed cover plate, and then airflowed into a web on the high-speed airflow roller).

[0020] Figures 1-3 Part Number Descriptions: 1. High-speed transfer roller; 2. Arc plate III; 3. High-speed airflow roller; 4. Arc plate II; 5. Combing roller; 6. Arc plate I; 7. Bottom duct I; 8. Bow-shaped expansion plate; 9. Airflow web forming channel; 10. Channel width adjustment linkage; 11. Pressing roller; 12. Supporting roller; 13. Right side blocking plate of upper air duct; 14. Lower suction air duct; 15. Upper suction air duct; 16. Corner deflecting roller; 17. Cotton stripping knife; 18. Bottom duct II; 19. Breathable mesh curtain; 20. Main suction. 21. Air duct, 22. Square-to-round pipe II, 23. Negative pressure suction fan, 24. Air blowing fan, 25. Air blowing box, 26. Air blowing nozzle, 27. T-junction pipe, 28. Air blowing hose I, 29. Air blowing hose II, 30. Square-to-round air inlet pipe I, 31. Pressing roller linkage adjustment mechanism, 32. Supporting roller linkage adjustment mechanism, 33. Left side blocking plate of upper air duct, C. Air blowing system, D. Negative pressure suction system, E. Suction air duct, W. Net width, FK. Width.

[0021] Figure 4Part number descriptions: 36. Feed roller I, 37. Feed roller II, 38. Feed curtain, 39. Pressing roller, 40. Working roller, 41. Stripping roller, 42. Traditional airflow web forming channel I, 43. Adjusting plate for adjusting the width of the airflow web forming channel, 44. Fan impeller with continuous width direction, 45. Cylinder, 46. Traditional pressing roller I, 47. Traditional negative pressure suction system I, 48. Traditional breathable mesh curtain I.

[0022] Figure 5 Part number descriptions: 51. Traditional high-speed transfer roller, 52. Traditional arc plate, 53. Traditional high-speed airflow roller, 54. Traditional fixed cover plate, 55. Traditional air nozzle, 56. Traditional air blower, 57. Traditional bow-shaped expansion plate, 58. Traditional airflow netting channel II, 59. Traditional breathable net curtain II, 60. Traditional net pressing roller II, 61. Traditional net supporting roller, 62. Traditional negative pressure suction system II, 63. Bottom opening below the traditional high-speed airflow roller. Detailed Implementation

[0023] The present invention will be further described below with reference to the accompanying drawings: like Figures 1-5As shown, the high-yield airflow web forming device for the stable generation of high-strength fiber webs from multi-specification fibers of the present invention is characterized in that: the web forming device includes a high-speed airflow roller 3 (on the one hand, the high-speed rotating high-speed airflow roller 3 cooperates with the ultra-low-speed combing roller 5 to generate relative motion, which can simply comb the fibers that have been combed in the combing zone and fully stretch them into fully extended, parallel single fibers, laying a good foundation for improving the quality and yield of the subsequent airflow web forming; on the other hand, the high-speed airflow roller 3 generates a strong centrifugal force when rotating at high speed, which can help to smoothly throw most of the fibers off the high-speed airflow roller 3), and is arranged in a gap-like and tangential manner in front of the high-speed airflow roller 3. The high-speed transfer roller 1 (its main function is to transfer the combed fibers from the combing zone to the high-speed airflow roller 3), two combing rollers 5 arranged above the high-speed airflow roller 3 (when the combing roller 5 rotates clockwise, it works with the high-speed airflow roller 3 to comb and stretch the fibers; when the combing roller 5 rotates counterclockwise, the excess fibers hooked on the combing roller 5 are carried away by the high-speed airflow roller 3 and enter the next round of combing, preventing fiber entanglement), and respectively surround the arc plate I 6 on the upper right, the arc plate II 4 above, the arc plate III 2 on the upper left, the drain bottom I 7 on the lower left, and the drain bottom II 18 below (the above arc plates and drain bottoms form a seal with the high-speed airflow roller 3 to ensure that the fibers are in a sealed environment). When the high-speed airflow roller 3 operates between the high-speed transfer roller 1 and the high-speed airflow roller 3 and the combing roller 5, it can be firmly controlled on the outer circumference of the high-speed airflow roller 3, preventing the overflow of fly wool, thereby improving the web production and web surface uniformity. The cotton stripping knife 17, which is fixed on the right end face of the bottom plate II 18, can remove fibers that have not been cleanly removed from the high-speed airflow roller 3 and prevent them from re-entering the high-speed airflow roller 3 for circulation combing. The pressing roller 11 and the bow-shaped expansion plate 8 are arranged in a gap manner to the right of the high-speed airflow roller 3 and are hinged from bottom to top. On the one hand, the pressing roller 11 cooperates with the supporting roller 12 to clamp the breathable net curtain 19 from top to bottom; on the other hand, the pressing roller 11 provides the mounting base for the bow-shaped expansion plate 8. Meanwhile, the pressing roller 11 can move left and right under the pushing and pulling action of the pressing roller connecting rod adjustment mechanism 31, driving the bow-shaped expansion plate 8 to move synchronously, thereby changing the width of the airflow web forming channel 9 to adapt to the web forming requirements of different fiber specifications and thicknesses. The airflow web forming channel 9 is formed by the left side of the bow-shaped expansion plate 8 and the right side of the arc plate I6, the high-speed airflow roller 3, and the cotton stripping knife 17, which is wide at the top and bottom and narrow in the middle. (The airflow web forming channel in this invention is designed to be wide at the top and bottom and narrow in the middle, so that the airflow and fiber encounter resistance at the top of the airflow web forming channel 9 and change direction, thereby making the fiber form an isotropic three-dimensional state, which is the key factor in forming a high-strength fiber web with a longitudinal and transverse strength ratio close to 1:1.)After passing the narrowest part of the airflow forming channel 9 and reaching the wider part below, with the assistance of the negative pressure suction airflow, the airflow carrying the isotropic fibers no longer deviates in direction, and the fibers can fall smoothly onto the breathable mesh curtain 19 along the direction of the negative pressure airflow. The blowing system C (which provides blowing airflow for the fibers to be separated from the high-speed airflow roller 3) is connected to the upper inlet of the airflow forming channel 9 at its outlet end. It is composed of the upper suction air duct 15 and the lower suction air duct 14 connected together, with its inlet end facing and connected to the lower outlet of the airflow forming channel 9, and its outlet end connected to the negative pressure suction system D. The interconnected suction duct E (serving as a connecting channel between the airflow web-forming channel 9 and the negative pressure suction system D), the support roller 12 arranged below the pressing roller (on one hand, the support roller 12 and the four corner turning rollers 16 jointly support the breathable mesh curtain 19; on the other hand, the support roller 12 cooperates with the pressing roller 11 to clamp the breathable mesh curtain 19 from top to bottom), and the breathable mesh curtain 19 looped around the support roller 12 and the four corner turning rollers 16 (the breathable mesh curtain 19 circulates along the support roller 12 and the four corner turning rollers 16, used to transfer the high-strength fiber web generated by the high-yield airflow to the next process). The left side of the bow-shaped expansion plate 8 is processed into a structure with a chamfered top and a rounded bottom, forming a shape that is curved at both ends and bulging in the middle (thus, the airflow web-forming channel 9 formed between the left side of the bow-shaped expansion plate 8 and the right side of the arc-shaped plate I6, the high-speed airflow roller 3, and the cotton stripping knife 17 forms a cavity that is wide at the top and bottom and narrow in the middle). A channel width adjustment link 10 is hinged to the upper middle part of the bow-shaped expansion plate 8 (the bow-shaped expansion plate 8 can be rotated around the pressure roller 11 as the axis under the pushing and pulling action of the channel width adjustment link 10, thereby adjusting the overall width and capacity of the airflow web-forming channel 9 to meet the needs of different fiber specifications). To accommodate different web thicknesses, a pressing roller linkage adjustment mechanism 31 is connected to the right side of the pressing roller 11 (the pressing roller 11 can move left and right under the pushing and pulling action of the pressing roller linkage adjustment mechanism 31 to adapt to the displacement of the bow-shaped expansion plate 8). A supporting roller linkage adjustment mechanism 32 is connected to the right side of the supporting roller 12 to adjust the web width W by pushing the supporting roller left and right (the supporting roller 12 can move left and right under the pushing and pulling action of the supporting roller linkage adjustment mechanism 32 to change the width of the upper suction duct 15, and together with the position adjustment of the pressing roller 11, adjust the web width W).

[0024] The blowing system C described in this invention consists of a blowing box 25, two blowing fans 23 arranged symmetrically on the left and right sides, which are connected in parallel to blowing hoses I 28 and II 29 through a three-way pipe 27, and then connected to the inlet end of the blowing box 25 through their respective square-to-round air inlet pipes I 30, and a blowing nozzle 26 connecting the outlet end of the blowing box 25 and the upper inlet of the airflow network channel 9 (the inlet end of the blowing box 25 is connected to the two blowing fans 23 through four air inlet branches to provide sufficient blowing airflow for the fibers to be peeled off from the high-speed airflow roller 3). The blowing box 25 has staggered and spaced air distribution plates 24 (for uniform airflow) arranged in the inner cavity of the blowing box 25.

[0025] The negative pressure suction system D described in this invention consists of two negative pressure suction fans 22 arranged symmetrically on the left and right sides, which are connected in parallel to the outlet end of the main suction duct 20 through square-to-round pipe II 21. The inlet end of the main suction duct 20 is connected to the outlet end of the lower suction duct 14. (In this way, the airflow from the airflow mesh channel 9 and the airflow passing through the upper suction duct 15, the lower suction duct 14 and the main suction duct 20 are simultaneously drawn from both sides by the two negative pressure suction fans 22. With the assistance of the negative pressure suction airflow, the direction of the airflow carrying the isotropic fibers no longer deviates when it reaches the wider part below the airflow mesh channel 9. The fibers can fall smoothly onto the breathable mesh curtain 19 along the direction of the negative pressure airflow.)

[0026] The high-speed airflow roller 3 described in this invention has a rotational speed greater than 4000 m / min (the higher the rotational speed of the high-speed airflow roller 3, the greater the centrifugal force generated, which facilitates more fibers to be smoothly thrown off the high-speed airflow roller 3 with the help of centrifugal force during high production).

[0027] The operating speed of the combing roller 5 in this invention is 0.3 to 0.4 m / min (the ultra-low speed operation of the combing roller 5 and the high-speed airflow roller 3 work together to generate relative motion, which can simply comb the fibers that have been combed in the combing zone and fully stretch them into fully extended, parallel single fibers). The combing roller 5 can rotate in both directions and the rotation angle is adjustable (when the combing roller 5 rotates clockwise, the high-speed airflow roller 3 plays the role of combing the fibers; when the combing roller 5 rotates counterclockwise, the high-speed airflow roller 3 can remove the excess fibers hooked on the combing roller 5 and enter the next round of combing to prevent tangling).

[0028] The top of the cotton stripping knife 17 described in this invention is processed with an arc shape that matches the roller surface of the high-speed airflow roller 3. The distance between the arc-shaped top of the cotton stripping knife 17 and the roller surface of the high-speed airflow roller 3 is 1mm (which can remove fibers that have not been cleanly removed from the high-speed airflow roller 3 and prevent them from re-entering the high-speed airflow roller 3 for circulation and combing).

[0029] In this invention, the right side blocking plate 13 of the upper air duct 15 can swing left and right as the position of the net roller 12 moves (when the position of the net roller 12 moves left and right under the pushing and pulling action of the net roller connecting rod adjustment mechanism 32, the right side blocking plate 13 of the upper air duct swings left and right accordingly, while the left side blocking plate 33 of the upper air duct remains fixed, thereby changing the width of the upper air duct 15 and adjusting the width W of the net).

[0030] The specific uses of this invention are as follows: First, the fibers that have been combed in the previous combing station (the combing method can be large roller combing, multi-roller combing, single cylinder combing, double cylinder combing and other combing modes) are stripped off by the high-speed transfer roller 1, and then the high-speed airflow roller 3 with a speed of up to 4000m / min or more is stripped off the high-speed transfer roller 1. At this time, the combed fibers present various forms such as straight, vertical and crimped.

[0031] Next, the fibers enter the area where a high-speed rotating high-speed airflow roller 3 interacts with two ultra-low-speed combing rollers 5 above it (the speed of the combing rollers 5 is set at 0.3-0.4 m / min). The combing rollers 5 can rotate alternately in both forward and reverse directions at a certain frequency. When the combing rollers 5 rotate clockwise, they move towards each other. The high-speed rotating high-speed airflow roller 3 and the ultra-low-speed combing rollers 5 interact to create relative motion, which can perform a simple re-combing of the fibers already combed in the combing zone and further fill the gaps in the fiber's structure. The fibers are drawn into fully extended, parallel single fibers, laying a solid foundation for improving the quality and increasing the yield of the subsequent air-laid web. When the combing roller 5 rotates counterclockwise, that is, when the combing roller 5 moves in opposite directions to the high-speed air-laid roller 3, excess fibers that occasionally wrap around the combing roller 5 are peeled off and carried away by the high-speed air-laid roller 3 to enter the next round of combing, preventing tangling. The arc-shaped plates III2, II4, and I6 surrounding the high-speed air-laid roller 3 and the combing roller 5 also assist the high-speed air-laid roller 3 in peeling fibers from the combing roller 5. At the same time, because the high-speed air-laid roller 3 is equipped with the bottom holes I7 and II18, arc-shaped plates III2, II4, and I6, along with the two combing rollers 5, a sealed area is formed before reaching the air-laid web channel 9. Even if the high-speed air-laid roller 3 rotates at high speed, the fibers can be firmly wrapped around the outer circumference of the roller body and will not overflow to form fly waste. The above two features ensure excellent airflow web formation, significantly improve web quality, and substantially increase airflow web production. Furthermore, this invention replaces the traditional fixed cover plate with an ultra-low-speed combing roller, which works in conjunction with a high-speed airflow roller to form combing and stretching functions. This minimizes the area of ​​the cardioid-cloth interface, effectively solving problems such as static electricity and high temperatures generated during fiber combing at this location without affecting functionality. It reduces uncertainties in the production process, overcomes the limitations of suitable fibers, and improves production reliability and stability.

[0032] Then, due to the large centrifugal force generated by the high-speed airflow roller 3 through high-speed rotation, the fibers at the end of the arc plate I6 are thrown into the upper cavity of the wider airflow web forming channel 9; at the same time, the air nozzle 26 connected to the upper cavity of the airflow web forming channel 9 sprays out the airflow provided by the air blowing system C - that is, the airflow enters from two parallel air blowing fans 23, and flows into the air blowing box 25 through four air intake branches in sequence, and then is sprayed out through the air nozzle 26, thereby ensuring that the fibers are in an extended state for detachment and transport.

[0033] Next, the fibers detached from the high-speed airflow roller 3 are conveyed downwards along the airflow web-forming channel 9 under the action of the blowing airflow. Because the airflow web-forming channel 9 is wider at the top and bottom and narrower in the middle, the airflow and fibers encounter resistance at the upper part of the channel and change direction, thus forming an isotropic three-dimensional state of the fibers. This is a key factor in forming a high-strength fiber web with a longitudinal and transverse strength ratio close to 1:1. This allows for the generation of uniform, thick high-strength fiber webs with a longitudinal and transverse strength ratio close to 1:1 and a maximum basis weight of up to 500 g / m². The web surface quality and uniformity are significantly improved, and the output of airflow web formation is significantly increased. After passing through the airflow web-forming channel... At the narrowest middle section of section 9, and towards the wider lower section, with the assistance of the negative pressure suction airflow provided by the negative pressure suction system D—that is, by two negative pressure suction fans 22 simultaneously drawing airflow from both sides from the airflow forming channel 9 and sequentially passing through the upper suction duct 15, lower suction duct 14, and main suction duct 20—the direction of the airflow carrying isotropic fibers no longer deviates, and the fibers can fall smoothly onto the breathable mesh curtain 19 along the direction of the negative pressure airflow. Therefore, the coordination of the compressed airflow from the blowing system C and the suction airflow from the negative pressure suction system D, as well as the directional guidance of the negative pressure airflow, are key factors for high-yield and high-quality airflow forming.

[0034] Finally, the breathable mesh curtain 19 circulates along the support roller 12 and the four corner turning rollers 16, transferring the high-strength fiber web generated by the high-yield airflow to the next station.

[0035] Meanwhile, since the airflow web forming device of the present invention needs to produce a large range of web basis weights (35-500 g / m²), the width and capacity of the corresponding airflow web forming channel 9 need to be adjusted according to the web basis weight. Therefore, the bow-shaped expansion plate 8 is set to an adjustable mode—that is, the bow-shaped expansion plate 8 can be rotated around the pressure roller 11 as the axis under the pushing and pulling action of the channel width adjustment linkage 10, thereby adjusting the overall width and capacity of the airflow web forming channel 9 to meet the web forming requirements of different fiber specifications and different thicknesses; the pressure roller 11 can move left and right under the pushing and pulling action of the pressure roller linkage adjustment mechanism 31 to adapt to the displacement of the bow-shaped expansion plate 8; at the same time, when When the support roller 12 moves left and right under the push-pull action of the support roller connecting rod adjustment mechanism 32, the right side block plate 13 of the upper air duct 15 can swing left and right as the position of the support roller 12 moves, while the left side block plate 33 of the upper air duct remains fixed, thereby changing the width of the upper air duct 15 and thus adjusting the width W of the net. The support roller 12, the lower air duct 14, and the upper air duct 15 are arranged below the breathable net curtain 19. The support roller 12 can move left and right under the push-pull action of the support roller connecting rod adjustment mechanism 32 to change the width of the upper air duct 15, and together with the position adjustment of the pressing roller 11, adjust the width W of the net. In summary, through the adjustable design of the above-mentioned components, the bow-shaped expansion plate 8, the pressing roller 11, the supporting roller 12, and the upper suction duct 15 in this invention can all be flexibly adjusted. That is, the width and capacity of the airflow web forming channel 9 can be flexibly adjusted as needed, which can meet the production needs of different fiber varieties, different weights, and different yields, expand the scope of application of this invention, and enhance its versatility and operational flexibility.

Claims

1. A high-yield airflow web forming device for the stable generation of high-strength fiber webs from multi-specification fibers, characterized in that: The web forming device includes a high-speed airflow roller (3), a high-speed transfer roller (1) arranged in a gap and tangential manner in front of the high-speed airflow roller (3), two combing rollers (5) arranged above the high-speed airflow roller (3), an arc plate I (6) above the high-speed airflow roller (3), an arc plate II (4) above the high-speed airflow roller (3), an arc plate III (2) above the high-speed airflow roller (3), a bottom drain I (7) below the high-speed airflow roller (3), a bottom drain II (18) below the high-speed airflow roller (3), a cotton stripping knife (17) fixed on the right end face of the bottom drain II (18), a pressing roller (11) and an arc-shaped expansion plate (8) arranged in a gap to the right of the high-speed airflow roller (3) and hinged from bottom to top. The airflow forming channel (9) is formed by the left side of the bow-shaped expansion plate (8) and the right side of the arc plate I (6), the high-speed airflow roller (3), and the cotton stripping knife (17). The outlet end is connected to the blowing system (C) at the inlet of the airflow forming channel. The inlet end of the airflow forming channel (9) is directly opposite to the lower outlet of the airflow forming channel (9) after the upper suction duct (15) and the lower suction duct (14) are connected together. The outlet end is connected to the negative pressure suction system (D) of the suction duct (E). The support roller (12) is arranged below the pressing roller. The breathable net curtain (19) is wrapped around the support roller (12) and the four corner turning rollers (16). After the left side of the bow-shaped expansion plate (8) is processed into a structure with a top chamfer and a bottom arc, it forms a shape with two bends and a middle bulge. A channel width adjustment link (10) is hinged in the upper middle part of the bow-shaped expansion plate (8). A pressure roller link adjustment mechanism (31) is connected to the right side of the pressure roller (11). A support roller link adjustment mechanism (32) for pushing the support roller to move left and right to adjust the width (W) of the net is connected to the right side of the support roller (12). The blowing system (C) consists of a blowing box (25), two blowing fans (23) arranged symmetrically on the left and right, which connect blowing hose I (28) and blowing hose II (29) in parallel through a three-way pipe (27), and then connect to the inlet end of the blowing box (25) through their respective square-to-round air inlet pipe I (30), and a blowing nozzle (26) connecting the outlet end of the blowing box (25) and the upper inlet of the airflow network channel (9). The blowing box (25) is equipped with staggered and spaced air distribution plates (24) in the inner cavity of the blowing box (25). The negative pressure suction system (D) consists of two negative pressure suction fans (22) arranged symmetrically on the left and right, which connect to the outlet end of the main suction duct (20) in parallel through a square-to-round pipe II (21). The inlet end of the main suction duct (20) is connected to the outlet end of the lower suction duct (14). The high-speed airflow roller (3) has a rotational speed greater than 4000 m / min; the combing roller (5) has a running speed of 0.3 to 0.The speed is 4 m / min. The combing roller (5) can rotate in both directions and the rotation angle is adjustable. The top of the cotton stripping knife (17) is machined with an arc shape that matches the roller surface of the high-speed airflow roller (3). The distance between the arc-shaped top of the cotton stripping knife (17) and the roller surface of the high-speed airflow roller (3) is 1 mm. The right-side blocking plate (13) of the upper suction duct (15) can swing left and right as the position of the support roller (12) moves.

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