A meltblown nonwoven production line

Abstract

The present invention discloses a melt-blown nonwoven production line, comprising a material extrusion part, a web forming part, a gram weight detection part, an electret part and a winding part connected in sequence, wherein the material extrusion part is provided with a die head, and a heating part is connected to the die head; the electret part comprises a high-voltage electrostatic generator and a molybdenum wire across the surface of the melt-blown nonwoven fabric, and the two ends of the molybdenum wire are respectively connected to two tensioning mechanisms, and the tensioning mechanism comprises a fixed frame and an insulating tensioning support, the fixed frame is fixed to the equipment wallboard, and a mounting long hole extending vertically is provided on the fixed frame, and the insulating tensioning support is installed in the mounting long hole of the fixed frame and is locked with an insulating nut. The present invention is convenient for improving the electret effect, and can make the filtration efficiency of the melt-blown cloth reach more than 99%, which is convenient for increasing the output, can accurately control the product quality, can reduce the generation of defective products, and reduce the production cost.

Description

Technical Field

[0001] The invention belongs to the field of textiles, and in particular relates to a melt-blown nonwoven fabric production line. Background Art

[0002] In recent years, the demand for meltblown nonwovens has been increasing. Meltblown nonwovens are widely used as filter materials, medical and sanitary materials, environmental protection materials, clothing materials, etc. The meltblown nonwoven process uses high-speed hot air to stretch the polymer melt stream extruded from the die spinneret, thereby forming ultra-fine fibers and condensing them on the receiving mesh curtain or roller, and relying on self-bonding to become nonwovens.

[0003] Patent document CN101962877A discloses a small meltblown nonwoven fabric production line, including an extruder, an air supply device and a receiving device. The production line has a simple structure and low processing cost, but its output is low, and the production line is imperfect, there is no detection part, and the meltblown fabric cannot be tested for quality online. Patent document CN110820173A discloses a meltblown nonwoven fabric production process and carbon spreading equipment, which includes meltblowing production and carbon spreading process, mainly introducing the process of ejecting materials from the die head and the carbon spreading process, but does not clarify the entire meltblown nonwoven fabric production line. Summary of the invention

[0004] The present invention provides a meltblown nonwoven fabric production line to solve the technical problems existing in the known technology. The filtration efficiency of the meltblown fabric produced by the production line can reach more than 99%, and the output is high and the quality is good.

[0005] The technical solution adopted by the present invention to solve the technical problems existing in the known technology is: a melt-blown non-woven fabric production line, comprising a material extrusion part, a web forming part, a gram weight detection part, an electret part and a winding part connected in sequence, the material extrusion part is provided with a die head, and a heating part is connected to the die head; the electret part comprises a high-voltage electrostatic generator and a molybdenum wire across the surface of the melt-blown non-woven fabric, the two ends of the molybdenum wire are respectively connected to two tensioning mechanisms, and the high-voltage electrostatic generator is arranged near any one of the tensioning mechanisms; the tensioning mechanism comprises a fixing frame and an insulating tensioning support, and the fixing frame is fixedly connected to On the equipment wall panel, a long installation hole extending vertically is provided on the fixing frame, the insulating tensioning support is inserted into the long installation hole of the fixing frame and is locked with an insulating nut, the insulating tensioning support is provided with a center guide hole, a tensioning conductive slider slidably connected to it is installed in the center guide hole of the insulating tensioning support, the tensioning conductive slider is threadedly connected to the insulating lead screw, the insulating lead screw passes through the center guide hole of the insulating tensioning support and is supported by the insulating tensioning support, the end of the molybdenum wire is fixedly connected to the tensioning conductive slider, and the tensioning conductive slider is electrically connected to the high-voltage electrostatic generator.

[0006] The web-forming part is arranged directly below the die head at a distance of 300 to 400 mm, and is provided with an air duct part and a mesh belt mechanism directly opposite to the die head. The air duct part is arranged in the mesh belt mechanism, and the air duct part includes an air suction port and a first-level wind box connected thereto, a perforated plate is fixedly connected to the air suction port, the bottom of the first-level wind box is connected to the bottom of the second-level wind box through a U-shaped air duct arranged symmetrically on the left and right, an exhaust pipe is connected to the second-level wind box, and the perforated plate is attached to the lower surface of the mesh belt of the mesh belt mechanism.

[0007] A negative pressure sensor is installed on the first-stage wind box, and the negative pressure sensor is located at the outlet of the air suction port.

[0008] The orifice plate is provided with downward-turned connecting edges around it, and a connecting long hole extending vertically is opened on the downward-turned connecting edge. The orifice plate is connected to the air suction port by screws, and the screws are connected to the air suction port through the connecting long hole.

[0009] The air suction port adopts a gradually expanding structure, with a large opening at the inlet and a small opening at the outlet.

[0010] A wire passing plate is fixedly connected to the inner end of the insulating tensioning support. The longitudinal section of the wire passing plate is Z-shaped, and is provided with a hanging section, a horizontal section and an upward extension section from the inside to the outside. The hanging section, the horizontal section and the upward extension section of the wire passing plate are all provided with wire passing holes. The end of the molybdenum wire passes through the wire passing hole on the wire passing plate, enters the central hole of the insulating tensioning support, and is connected with the tensioning conductive slider.

[0011] The tensioning conductive slider is provided with a wire connection screw hole and a molybdenum wire connection screw hole. The end of the molybdenum wire passes through the wire hole on the wire plate and enters the central guide hole of the insulating tensioning support, and is connected to the tensioning conductive slider by tightening the screw I in the molybdenum wire connection screw hole; the conductive wire of the high-voltage electrostatic generator passes through the wire entry hole on the insulating tensioning support and enters the central hole of the insulating tensioning support, and is connected to the tensioning conductive slider by tightening the screw II in the wire connection screw hole.

[0012] The material extrusion part is installed on a supporting platform, and comprises a feeder, a screw extruder, a screen changer, a metering pump, a melt pipe and the die head which are connected in sequence.

[0013] The mesh belt mechanism and the air duct part are both mounted on a bracket, the bracket is mounted on a frame in an adjustable manner up and down, a roller is mounted on the bottom of the frame, the roller is mounted on a track, and the track is laid on the ground.

[0014] The heating part is installed below the supporting platform and is provided with a hot air outlet. The hot air outlet of the heating part is connected to the two sides of the die head through a pipeline.

[0015] The advantages and positive effects of the present invention are: by adopting more complete devices, the production process of meltblown nonwoven fabrics is more complete, which is convenient for increasing output and ensuring quality. By adding a detection part in the production line, the meltblown fabric can be subjected to online, continuous and non-contact quality detection, accurately controlling product quality, reducing the generation of defective products and reducing production costs. The electret part uses molybdenum wire instead of the electret discharge rod to add static electricity to the meltblown fabric, which can greatly reduce the space occupied; the molybdenum wire can be tightened and adjusted, and the working position can be adjusted to facilitate improving the electret effect, thereby improving the filtering performance of the meltblown fabric, so that its filtering efficiency can reach more than 99%. The air duct part connects the first-level wind box and the bottom of the second-level wind box by adopting a left-right symmetrically arranged U-shaped air duct, which greatly improves the uniformity of air suction and makes the non-woven fabric dissipate heat evenly; by installing a negative pressure sensor on the first-level wind box and at the outlet of the air suction port, the size of the wind pressure in the air duct can be monitored at any time, and feedback can be given in time. The size of the wind force can be adjusted at any time through dynamic detection, which can improve product quality, reduce energy consumption, and reduce the production cost of meltblown nonwoven fabrics. Furthermore, the invention has a simple structure and is easy to install, use and maintain. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the present invention;

[0017] Figure 2 It is a structural schematic diagram of the electret part of the present invention;

[0018] Figure 3 It is a schematic structural diagram of the tensioning mechanism of the electret part of the present invention;

[0019] Figure 4 for Figure 3 A cross-sectional view of

[0020] Figure 5 It is a structural schematic diagram of the air duct part of the present invention;

[0021] Figure 6 It is an assembly diagram of the air inlet and the first-stage bellows of the air duct part of the present invention;

[0022] Figure 7 It is a schematic diagram of the orifice plate structure of the air duct part of the present invention;

[0023] Figure 8 for Figure 5 Enlarged view of part A.

[0024] In the figure: 1. Feeder, 2. Screw extruder, 3. Screen changer, 4. Metering pump, 5. Melt tube, 6. Die head, 7. Air duct part, 7-1. Orifice plate; 7-1-1. Downturned connecting edge; 7-1-2. Long connecting hole; 7-2. Air suction port; 7-3. First-stage bellows; 7-4. U-shaped air duct; 7-5. Second-stage bellows; 7-6. Exhaust duct; 7-7. Negative pressure sensor; 7-8. Screw; 8. Mesh belt mechanism; 9. Gram weight detection part; 10. Electret part; 10-1. Molybdenum wire; 10-2. Wire passing Plate, 10-2-1, wire hole, 10-3, insulating nut, 10-4, tightening conductive slider, 10-4-1, wire connection screw hole; 10-4-2, molybdenum wire connection screw hole; 10-5, fixing bracket, 10-5-1, installation long hole, 10-6, insulating tensioning support, 10-6-1, center guide hole, 10-6-2, wire entry hole, 10-7, insulating screw rod, 11, cutting part, 12, meltblown cloth, 13, winding part, 14, track, 15, heating part, 16, support platform. DETAILED DESCRIPTION

[0025] In order to further understand the content, features and effects of the present invention, the following embodiments are given as examples and described in detail with reference to the accompanying drawings:

[0026] See also Figure 1 A meltblown nonwoven fabric production line includes a material extrusion part, a web forming part, a gram weight detection part 9, an electret part 10 and a winding part 13 which are connected in sequence. The material extrusion part is provided with a die head 6, and a heating part 15 is connected to the die head 6.

[0027] The electret part 10 includes a high-voltage electrostatic generator (not shown in the figure) and a molybdenum wire 10-1 across the surface of the meltblown non-woven fabric. The two ends of the molybdenum wire 10-1 are respectively connected to two tensioning mechanisms, and the high-voltage electrostatic generator is arranged near any one of the tensioning mechanisms.

[0028] The tensioning mechanism includes a fixing frame 10-5 and an insulating tensioning support 10-6. The fixing frame 10-5 is provided with a long mounting hole 10-5-1 extending vertically. The insulating tensioning support 10-6 is inserted into the long mounting hole 10-5-1 of the fixing frame and is locked with an insulating nut 10-3. The insulating tensioning support 10-6 is provided with a central guide hole 10-6-1. A tensioning conductive slider 10-4 slidably connected to the central guide hole 10-6-1 of the insulating tensioning support is installed in the central guide hole 10-6-1 of the insulating tensioning support. The tensioning conductive slider 10-4 is threadedly connected to the insulating lead screw 10-7. The insulating lead screw 10-7 passes through the central guide hole 10-6-1 of the insulating tensioning support and is supported by the insulating tensioning support 10-6. The end of the molybdenum wire 10-1 is fixedly connected to the tensioning conductive slider 10-4, and the tensioning conductive slider 10-4 is electrically connected to the high-voltage electrostatic generator.

[0029] When producing meltblown cloth for masks, a slitting part 11 should be added between the electret part 10 and the winding part 13 to separate the meltblown cloth into strips before winding.

[0030] The above production line has complete process equipment. By adding a gram weight detection part 9 in the production line, the meltblown cloth can be subjected to online, continuous and contactless quality detection, accurately controlling product quality and reducing production costs. By setting a molybdenum wire adjustment mechanism, the electret effect can be better improved. Therefore, the above production line is used to produce meltblown cloth, with high output and good quality, and the filtration efficiency can reach more than 99%.

[0031] On the basis of the above scheme, the present invention also makes the following improvements:

[0032] A wire passing plate 10-2 is fixedly connected to the inner end of the insulating tension support 10-6. The longitudinal section of the wire passing plate 10-2 is Z-shaped, and a drooping section, a horizontal section and an upward extension section are provided from the inside to the outside. A wire passing hole 10-2-1 is provided on the drooping section, the horizontal section and the upward extension section of the wire passing plate 10-2. The end of the molybdenum wire 10-1 passes through the wire passing hole 10-2-1 on the wire passing plate and enters the central guide hole 10-6-1 of the insulating tension support to connect with the tension conductive slider 10-4. The above structure facilitates the installation, adjustment and maintenance of the molybdenum wire 10-1. A wire connecting screw hole 10-4-1 and a molybdenum wire connecting screw hole 10-4-2 are provided on the tensioning conductive slider 10-4. The end of the molybdenum wire 10-1 passes through the wire hole 10-2-1 on the wire plate and enters the central guide hole 10-6-1 of the insulating tensioning support, and is connected to the tensioning conductive slider 10-4 by tightening the screw I (not shown in the figure) in the molybdenum wire connecting screw hole 10-4-2; the conductive wire of the high-voltage electrostatic generator passes through the wire entry hole 10-6-2 on the insulating tensioning support and enters the central guide hole 10-6-1 of the insulating tensioning support, and is connected to the tensioning conductive slider 10-4 by tightening the screw II (not shown in the figure) in the wire connecting screw hole 10-4-1.

[0033] The above-mentioned electret part uses molybdenum wire for electret discharge, which occupies a small space and has a good electret effect. The molybdenum wire is provided with a tensioning structure, and the tensioning structure adopts a spiral transmission mechanism composed of an insulating screw rod 10-7 and a tensioning conductive slider 10-4, and the performance is stable and reliable; the tensioning structure uses an insulating nut 10-3 to lock on the vertical mounting long hole on the fixed bracket 10-5, so that the upper and lower positions of the molybdenum wire 10-1 can be adjusted, and the adjustment range is large, that is, the distance between the molybdenum wire and the cloth surface has a large adjustment range. In summary, the molybdenum wire 10-1 used for electret is adjustable in tightness and adjustable in upper and lower positions, which is convenient for improving the electret effect of the melt-blown non-woven fabric and making the melt-blown non-woven fabric have better filtering performance. In addition, the present invention has a simple structure and is easy to use and maintain.

[0034] The web forming part is arranged at a distance of 300 to 400 mm from the die head, and is provided with an air duct part 7 and a mesh belt mechanism 8 facing the die head 6. The air duct part 7 is arranged in the mesh belt mechanism 8.

[0035] The air duct part includes an air suction port 7-2 and a primary wind box 7-3 connected thereto, a perforated plate 7-1 is fixedly connected to the air suction port 7-2, the bottom of the primary wind box 7-3 is connected to the bottom of the secondary wind box 7-5 through a left-right symmetrically arranged U-shaped air duct 7-4, an exhaust pipe 7-6 is connected to the secondary wind box 7-5, and the perforated plate 7-1 is attached to the lower surface of the mesh belt of the mesh belt mechanism 8. By using the left-right symmetrically arranged U-shaped air duct 7-4 to connect the bottom of the primary wind box 7-3 with the bottom of the secondary wind box 7-5, the uniformity of air suction is greatly improved.

[0036] In order to make the positions of the air duct part 7 and the mesh belt mechanism 8 adjustable, the mesh belt mechanism 8 and the air duct part 7 are both installed on a bracket, and the bracket is adjustably installed on the frame up and down, and rollers are installed at the bottom of the frame, and the rollers are installed on the track 14, and the track 14 is laid on the ground.

[0037] A negative pressure sensor 7-7 is installed on the first-level wind box 7-3. The negative pressure sensor 7-7 is located at the outlet of the air suction port 7-2. The negative pressure sensor 7-7 can monitor the size of the wind pressure in the air duct at any time and give feedback in time. The size of the wind force can be adjusted at any time through dynamic detection, which can improve product quality, reduce energy consumption, and reduce the production cost of melt-blown nonwoven fabrics. The orifice plate 7-1 is provided with a downward-turned connecting edge 7-1-1 around it, and a connecting long hole 7-1-2 extending vertically is opened on the downward-turned connecting edge 7-1-1. The orifice plate 7-1 is connected to the air suction port 7-2 by a screw 7-8, and the screw 7-8 is connected to the air suction port 7-2 through the connecting long hole 7-1-2. This connection structure can make the upper and lower positions of the orifice plate 7-1 adjustable, which is convenient for installation and improving the air suction effect. The air suction port 7-2 adopts a gradually expanding structure, with a large opening at the entrance and a small opening at the exit, which can enhance the air suction effect. The cross-sections of the primary wind box 7-3, the secondary wind box 7-5 and the U-shaped air duct 7-4 are rectangular, and the cross-section of the exhaust duct 7-6 is circular, which is convenient for connection.

[0038] When in use, the orifice plate 7-1 is connected to the large opening of the air suction port 7-2, the small opening of the air suction port is connected to the top of the first-level bellows 7-3, the negative pressure sensor 7-7 is installed on the side wall of the first-level bellows 7-3, close to the small opening of the air suction port 7-2, the first-level bellows 7-3 is connected to the bottom of the second-level bellows 7-5 through two left-right symmetrical U-shaped air ducts 7-4, one side of the second-level bellows 7-5 is connected to the exhaust pipe 7-6, the exhaust pipe 7-6 is connected to the exhaust fan, then align the orifice plate 7-1 with the place where air suction is required on the net-making machine, adjust the distance between the orifice plate 7-1 and the air suction place, start the exhaust fan to implement air suction.

[0039] In this embodiment, the material extrusion part is installed on the support platform 16, and includes a feeder 1, a screw extruder 2, a screen changer 3, a metering pump 4, a melt pipe 5 and the die head 6 connected in sequence. The heating part is installed below the support platform 16 and is provided with a hot air outlet, and the hot air outlet of the heating part is connected to both sides of the die head through a pipeline.

[0040] Working process of the present invention:

[0041] First, the material is added to the screw extruder 2 through the feeder 1. When the screw extruder 2 is working, the material is transported to the screen changer 3. The material is filtered by the screen changer 3 and enters the metering pump 4. Then, after being accurately metered by the metering pump 4 and heated by the melt pipe 5, it enters the die head 6. Under the action of the heating part 15, the material is ejected from the die head 6 and sprayed onto the web forming mechanism 8 below the die head 6. The heat of the material is absorbed by the air duct part 7, and the material is cooled on the mesh belt of the web forming mechanism 8 to form a meltblown cloth 12. Then the finished meltblown cloth is The meltblown cloth 12 is conveyed toward the gram weight detection part 9, and the meltblown cloth 12 enters the gram weight detection part, which will perform online, continuous and contactless quality detection on the meltblown cloth, and make timely feedback; then the meltblown cloth 12 is conveyed toward the electret part 10, and the meltblown cloth 12 enters the electret part 10, static electricity is added to the meltblown cloth 12, and its filtering performance is improved; the meltblown cloth 12 comes out of the electret part 10 and then enters the slitting part 11, and the meltblown cloth 11 is slit into long strips of set width, and finally enters the winding part 13 to wind the meltblown cloth.

[0042] Although the preferred embodiments of the present invention have been described above in conjunction with the accompanying drawings, the present invention is not limited to the above-mentioned specific embodiments, which are merely illustrative and not restrictive. Under the guidance of the present invention, ordinary technicians in this field can make many forms without departing from the scope of protection of the present invention and the claims, all of which fall within the scope of protection of the present invention.

Claims

1. A meltblown nonwoven fabric production line, characterized in that: It includes the material extrusion part, web forming part, weight detection part, electret part and winding part connected in sequence. The material extrusion part is provided with a die head, and the die head is connected with a heating part; The electret part includes a high-voltage electrostatic generator and a molybdenum wire across the surface of the melt-blown non-woven fabric, the two ends of the molybdenum wire are respectively connected to two tensioning mechanisms, and the high-voltage electrostatic generator is arranged near any one of the tensioning mechanisms; The tensioning mechanism comprises a fixing frame and an insulating tensioning support, the fixing frame is fixedly connected to the equipment wall panel, the fixing frame is provided with a vertically extending mounting long hole, the insulating tensioning support is inserted into the mounting long hole of the fixing frame and is locked with an insulating nut, the insulating tensioning support is provided with a central guide hole, a tensioning conductive slider slidably connected thereto is installed in the central guide hole of the insulating tensioning support, the tensioning conductive slider is threadedly connected to the insulating lead screw, the insulating lead screw passes through the central guide hole of the insulating tensioning support and is supported by the insulating tensioning support, the end of the molybdenum wire is fixedly connected to the tensioning conductive slider, and the tensioning conductive slider is electrically connected to the high-voltage electrostatic generator; The web forming part is arranged at a distance of 300 to 400 mm directly below the die head, and is provided with an air duct part and a mesh belt mechanism directly opposite to the die head. The air duct part is arranged inside the mesh belt mechanism, and the air duct part includes an air suction port and a first-level wind box connected thereto, a perforated plate is fixedly connected to the air suction port, the bottom of the first-level wind box is connected to the bottom of the second-level wind box through a U-shaped air duct arranged symmetrically on the left and right, an exhaust pipe is connected to the second-level wind box, and the perforated plate is attached to the lower surface of the mesh belt of the mesh belt mechanism; A wire-passing plate is fixedly connected to the inner end of the insulating tension support, the longitudinal section of the wire-passing plate is Z-shaped, and is provided with a drooping section, a horizontal section and an upward extension section from the inside to the outside, and wire-passing holes are provided on the drooping section, the horizontal section and the upward extension section of the wire-passing plate. The end of the molybdenum wire passes through the wire-passing hole on the wire-passing plate and enters the central hole of the insulating tension support to be connected with the tensioning conductive slider; The tensioning conductive slider is provided with a wire connection screw hole and a molybdenum wire connection screw hole. The end of the molybdenum wire passes through the wire hole on the wire plate and enters the central guide hole of the insulating tensioning support, and is connected to the tensioning conductive slider by tightening the screw I in the molybdenum wire connection screw hole; the conductive wire of the high-voltage electrostatic generator passes through the wire entry hole on the insulating tensioning support and enters the central hole of the insulating tensioning support, and is connected to the tensioning conductive slider by tightening the screw II in the wire connection screw hole.

2. The meltblown nonwoven production line according to claim 1, characterized in that: A negative pressure sensor is installed on the first-stage wind box, and the negative pressure sensor is located at the outlet of the air suction port.

3. The meltblown nonwoven fabric production line according to claim 1, characterized in that: The orifice plate is provided with downward-turned connecting edges around it, and a connecting long hole extending vertically is opened on the downward-turned connecting edge. The orifice plate is connected to the air suction port by screws, and the screws are connected to the air suction port through the connecting long hole.

4. The meltblown nonwoven production line according to claim 1, characterized in that: The air suction port adopts a gradually expanding structure, with a large opening at the inlet and a small opening at the outlet.

5. The meltblown nonwoven fabric production line according to claim 1, characterized in that: The material extrusion part is installed on a supporting platform, and comprises a feeder, a screw extruder, a screen changer, a metering pump, a melt pipe and the die head which are connected in sequence.

6. The meltblown nonwoven production line according to claim 1, characterized in that: The mesh belt mechanism and the air duct part are both mounted on a bracket, the bracket is mounted on a frame in an adjustable manner up and down, a roller is mounted on the bottom of the frame, the roller is mounted on a track, and the track is laid on the ground.

7. The meltblown nonwoven production line according to claim 5, characterized in that: The heating part is installed below the supporting platform and is provided with a hot air outlet. The hot air outlet of the heating part is connected to the two sides of the die head through a pipeline.

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