CN213896228U - Melt-blown fabric preparation facilities - Google Patents
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- CN213896228U CN213896228U CN202022527849.8U CN202022527849U CN213896228U CN 213896228 U CN213896228 U CN 213896228U CN 202022527849 U CN202022527849 U CN 202022527849U CN 213896228 U CN213896228 U CN 213896228U
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Abstract
The utility model discloses a melt-blown fabric preparation device, which comprises a melt-blown non-woven fabric manufacturing device and a reaction kettle body, wherein raw materials used by the melt-blown non-woven fabric manufacturing device are treated by carbon dioxide permeation in a supercritical state; an electrostatic field generating device is arranged between a melt-blown nozzle and a receiving device in a melt-blown non-woven fabric manufacturing device, fluid sprayed from the melt-blown nozzle is pulled and stretched to the receiving device under the combined action of high-temperature hot air flow and static electricity, a reaction kettle body device is used with the melt-blown non-woven fabric manufacturing device, raw materials subjected to supercritical carbon dioxide permeation treatment are supplied to the melt-blown non-woven fabric manufacturing device, the electrostatic field generating device is additionally arranged, the fluid sprayed by melt-blown is pulled and stretched by the static electricity and the high-temperature hot air flow, and the device can be used for preparing superfine fibers.
Description
Technical Field
The utility model relates to a melt-blown fabric preparation technical field, concretely relates to melt-blown fabric preparation facilities.
Background
In the melt-blown non-woven fabric forming process, common equipment generally comprises a screw extruder, a melt filter, a gear metering pump, a melt-blown die head assembly and a receiving device, the melt is conveyed to the melt filter by the screw extruder, then the filtered melt is conveyed to the gear metering pump, the melt is metered and conveyed to a melt-blown spray head, the melt is sprayed to the receiving device under the pressurization matching of air holes on two sides of a spinneret hole of the melt-blown spray head, the diameter of formed non-woven fabric fibers is generally higher than 3 mu m, NaCL particulate matter filtration detection is carried out, the flow is 85L/min, for 0.3 mu m particulate matter, a double-layer unit area of 50g fiber cloth is difficult to reach 99.99 percent, the filtration effect cannot meet the requirement, but the difficulty of the fibers with thinner forming diameters is very high, and the improvement is needed.
SUMMERY OF THE UTILITY MODEL
In order to solve the technical defect, the utility model provides a following technical scheme:
the melt-blown fabric preparation device comprises a melt-blown non-woven fabric manufacturing device and also comprises
A reaction kettle body, which is used for permeating and treating raw materials used by a melt-blown non-woven fabric manufacturing device by carbon dioxide in a supercritical state;
and an electrostatic field generating device is arranged between a melt-blowing nozzle and a receiving device in the melt-blowing non-woven fabric manufacturing device, and fluid sprayed from the melt-blowing nozzle is drawn and stretched to the receiving device under the action of high-temperature hot air flow and static electricity.
The preparation device connects the reaction kettle body with a melt-blown non-woven fabric manufacturing device, supplies the raw material subjected to the permeation treatment of the supercritical carbon dioxide to the melt-blown non-woven fabric manufacturing device, is additionally provided with an electrostatic field generating device, the electrostatic field has a certain static standing effect on the fiber at the front end, draws and stretches the fluid sprayed by melt by matching with the high-temperature hot air flow through static electricity, can be used for preparing superfine fibers, and improves the filtering performance of the melt-blown fabric after forming.
The electrostatic field generating device comprises a high-voltage insulating plate and a high-voltage electrostatic field generator, wherein the high-voltage insulating plate is arranged on the periphery of a spinneret orifice of the melt-blown spray head, the high-voltage electrostatic field generator is arranged at the far end of the spraying direction of the spinneret orifice, and a movable receiving part in the receiving device penetrates through the high-voltage electrostatic field generator and the high-voltage insulating plate to generate an electric field by matching the high-voltage electrostatic field generator with the high-voltage insulating plate, so that melt-blown fluid is drawn to the receiving device.
Further, the receiving device is a mesh belt receiver, the mesh belt is used as a mobile receiving part, the mesh belt passes between the high-voltage electrostatic field generator and the high-voltage insulating plate to receive the fiber wires, and other receiving devices such as a roller and the like can be adopted.
Further, the electric field voltage generated by the electrostatic field generating device: 1-8 ten thousand volts, and the prepared fiber has smaller diameter.
Further, the melt-blown nonwoven fabric manufacturing device comprises a screw extruder, a filtering device, a metering pump, a melt-blown die head assembly and a receiving device, which are basic devices of the melt-blown nonwoven fabric manufacturing device, and a feeding system, a heating system, a lubricating system, a cooling system and the like can be added according to needs.
In a second aspect, the present application provides a method for preparing ultrafine fiber meltblown, comprising the following steps
Carrying out infiltration treatment on raw material particles suitable for melt-blown non-woven fabric by using supercritical carbon dioxide;
the particles prepared by the steps are used as raw materials for melt-blowing, and a high-voltage electrostatic field is arranged between a melt-blowing nozzle and a receiving device, so that the melt sprayed from the melt-blowing nozzle is pulled and stretched to the receiving device by the cooperation of static electricity and high-temperature hot air flow.
The utility model discloses the people discovers in the process of the test by accident, after the raw materials granule that will melt the non-woven fabrics with supercritical carbon dioxide infiltration treatment, a large amount of little bubble holes can appear on the spun cellosilk surface of remelting, the specific surface area increase, the porosity increase, the fashioned melt-blown cloth filtration performance of cellosilk promotes by a wide margin, melt shower nozzle spun fluid plastification reinforcing from melting in addition, draw the melt-blown cloth that the extension helps the superfine fibre of shaping to constitute through high-pressure electrostatic field cooperation high temperature hot gas stream, its filtration performance further promotes.
Further, the process of osmotically treating raw material particles suitable for melt-blown nonwoven fabric with supercritical carbon dioxide is as follows: placing raw material particles suitable for melt-blown non-woven fabric into a reaction vessel, charging carbon dioxide, pressurizing, heating to a supercritical state, gradually permeating into the raw material particles, then evacuating gas in the reaction vessel, and directly drying the raw material or performing high-temperature foaming treatment on the raw material.
The supercritical carbon dioxide is usually treated by pressurizing and heating to make it in a supercritical state and then permeate into the raw material, and then two treatment methods can be selected, wherein one method is to directly dry the raw material after the pressure of the reaction vessel is released, and then supply the raw material to a melt-blowing device.
Or the raw material is subjected to high-temperature foaming treatment after pressure relief to form melt-blown raw material, for example, the melt-blown raw material is directly prepared into spherulitic slices by a reaction kettle, or the raw material subjected to supercritical foaming treatment is prepared into melt-blown slices.
Furthermore, the pressure in the reaction vessel is above 7.38Mpa, the temperature is above 31 ℃, and the permeation time is above 0.5 h.
Further, the raw material particles are made of any one or more of polypropylene, polyester, polyamide, polyethylene, polytetrafluoroethylene, polystyrene, PBT, EMA and EVA, which are common raw materials of melt-blown non-woven fabrics, and can be freely selected according to requirements, or two or more raw materials are mixed to prepare slices.
Preferably, the electrostatic field voltage: 1-8 ten thousand volts, the receiving distance between the outlet of the spinneret orifice of the melt-blowing die head and the receiving device is as follows: 50mm-300mm, good traction stability and thinner formed fiber.
Further, the raw material particles subjected to the permeation treatment with supercritical carbon dioxide were placed in a screw extruder, and the temperature in each zone of the extruder: the temperature setting range of the 1-12 area is 170-260 ℃, and then the fiber is input into a melt-blown die head through a metering pump, the temperature of the die head is 240-260 ℃, the extrusion speed from the die head is 20HZ, the net forming height is 5-30cm, the hot air rotating speed is 500-plus-1500 Rpm, the air suction rotating speed is 800-plus-3000 Rpm, the forming linear speed is 8-25M/min, the stability is good, and the formed fiber is thinner.
Compared with the prior art, the beneficial effects of the utility model are that:
1. the utility model discloses with the reation kettle body and melt-blow non-woven fabric manufacturing installation and use to the granule melts for the raw materials melts after the supercritical carbon dioxide infiltration, cooperates electrostatic field generating device, and filtering quality promotes by a wide margin, and easy shaping diameter is at the superfine fiber below 1 micron.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
FIG. 1 is a flow diagram of a melt blown nonwoven fabric preparation process;
wherein the reference numerals are:
1. a gas storage tank; 2. a refrigeration unit; 3. a condenser; 4. a booster pump; 5. preheating a storage tank; 6. a temperature controller; 7. A high-pressure reaction kettle; 8. a screw extruder; 9. a melt filter; 10. a gear metering pump; 11. a melt-blown spray head; 12. a high voltage insulation plate; 13. an air compressor; 14. an air heater; 15. an exhaust fan; 16. a high-voltage electrostatic field generator; 17. a mesh belt receiver; 18. an edge cutting winder.
Detailed Description
The invention will be further explained with reference to the drawings and the specific embodiments.
The melt-blown non-woven fabric manufacturing device combines a conventional melt-blown non-woven fabric manufacturing device with a supercritical infiltration device, uses carbon dioxide in a supercritical state to infiltrate and process raw materials used for melt-blowing, melts the raw materials by the melt-blown non-woven fabric manufacturing device, sprays the molten raw materials from a melt-blown nozzle orifice, and draws and stretches the molten raw materials to a receiving device by electrostatic matching high-temperature hot air flow.
Specifically, as shown in fig. 1, the melt-blown nonwoven fabric manufacturing apparatus selects common production process apparatuses, including a screw extruder 8, a melt filter 9, a gear metering pump 10, a melt-blown die head assembly, and a mesh belt receiver 17, wherein air holes at two sides of a spinneret hole of a melt-blown nozzle 11 are pressurized and filled with air by an external air compressor 13 in cooperation with an air heater 14, and certainly, systems such as a feeding system, a heating system, a lubricating system, a cooling system, an electric control system and the like can be added according to needs, such as a 2400 MB full-automatic melt-blown production line of Reifenhause company, and in addition, raw material slices can be dried, pre-crystallized and the like according to needs.
The parameters during melt blowing are set as follows: temperature of each zone of the extruder: the temperature setting range of the 1-12 area is 170-260 ℃, and then the mixture is input into a melt-blown die head through a metering pump, the temperature of the die head is 240-260 ℃, the extrusion speed from the die head is 20HZ, the net forming height is 5-30cm, the hot air rotating speed is 500-3000 Rpm, the air suction rotating speed is 800-3000Rpm, and the forming linear speed is 8-25M/min.
The supercritical penetration device selects a reaction kettle body, such as a high-pressure reaction kettle 7, raw material particles are input into the high-pressure reaction kettle, carbon dioxide is pressurized and heated to reach a supercritical state, the carbon dioxide is continuously kept to penetrate into the raw material particles, then the carbon dioxide in the kettle is discharged to reduce the pressure, then the raw material particles are directly dried or foamed at high temperature again, and the foamed particles can also be used as melt-blown raw materials.
The parameters for supercritical permeation were set as follows: the pressure in the reaction kettle body is more than 7.0Mpa, the temperature is more than 31 ℃, the infiltration time is more than 0.5h, and the filtration performance of the formed melt-blown fabric can be greatly improved.
Or after supercritical infiltration and foaming treatment, the filtering performance of the formed melt-blown fabric can be greatly improved.
Wherein the device as shown in figure 1 is selected for use in the input of carbon dioxide, including the condensation conveyor, preheat storage tank and gas storage tank, the condensation conveyor includes condenser 3, refrigerating unit 2, carbon dioxide gas gets into the condenser through the pipeline in the gas storage tank 1, form the fluid through the refrigeration of refrigerating unit refrigeration, it preheats formation gas to get into preheating storage tank 5 through booster pump 4, it is internal that gas gets into high-pressure reactor 7, constantly input carbon dioxide gas through the booster pump and pressurize, the temperature controller 6 control of the cauldron body heats up, make the internal carbon dioxide of cauldron be in supercritical state, then permeate into the internal raw materials granule of cauldron, keep permeating for a period of time, the internal carbon dioxide of cauldron of later discharging, direct drying, or the heating of cauldron body makes it expand the foaming with higher speed.
In this embodiment, an electrostatic field generating device is disposed between the melt-blowing nozzle and the receiving device, including a high voltage insulating plate 12 and a high voltage electrostatic field generator 16, wherein the high voltage insulating plate is installed around the spinneret orifice of the melt-blowing nozzle, the high voltage electrostatic field generator is disposed at the far end of the spray direction of the spinneret orifice, the mobile receiving part in the receiving device passes through the high voltage electrostatic field generator and the high voltage insulating plate, such as a mesh belt receiver 17, the mesh belt passes through the high voltage electrostatic field generator and the high voltage insulating plate to receive the fiber filaments, of course, other receiving devices, such as a roller, etc., are also applicable, the high voltage electrostatic field generator cooperates with the high voltage insulating plate to generate an electric field, and pulls the melt-blowing fluid to the receiving device, wherein the receiving distance is 50mm-300mm, and the electric field voltage generated by the electrostatic field generating device: 1-8 ten thousand volts, and the prepared fiber has smaller diameter.
Example 1
The melt-blown fabric preparation device in the embodiment is shown in fig. 1, wherein the supercritical osmotic treatment device selects a high-pressure reaction kettle 7, the input device of carbon dioxide comprises a condensation conveying device, a preheating storage tank 5, a booster pump 4 and a gas storage tank 1, the condensation conveying device comprises a condenser 3 and a refrigerating unit 2, carbon dioxide gas in the gas storage tank 1 enters the condenser through a pipeline, the carbon dioxide gas is refrigerated by the refrigerating unit to form fluid, the fluid enters the preheating storage tank 5 through the booster pump 4 to be preheated to form gas, the gas enters the high-pressure reaction kettle 7 body and is continuously input into the carbon dioxide gas through the booster pump to be pressurized, and the temperature controller 6 of the kettle body controls the temperature rise to enable the carbon dioxide in the kettle body to be in a supercritical state.
The melt-blown non-woven fabric manufacturing device comprises a screw extruder 8, a melt filter 9, a gear metering pump 10, a melt-blown die head component and a receiving device, wherein the receiving device adopts a mesh belt receiver 17 and a matched exhaust fan 15, and is additionally provided with an edge cutting winder 18 for winding non-woven fabrics, wherein the air holes at two sides of the spinneret hole of the melt-blown nozzle 11 are pressurized and filled with air by an external air compressor 13 matched with an air heater 14, an electrostatic field generating device is arranged between the melt-blown nozzle 11 and a mesh belt receiver in the embodiment and comprises a high-voltage insulating plate 12 and a high-voltage electrostatic field generator 16, wherein the periphery of the spinneret orifice of the melt-blown nozzle is provided with a high-voltage insulating plate which is 1mm away from the spinneret orifice, the far end in the jet direction of the spinneret orifice is provided with a high-voltage electrostatic field generator, and a mesh belt passes through the high-voltage electrostatic field generator and the high-voltage insulating plate, and the receiving distance is 50-300 mm.
The following PP material commonly used for melt-blown fabric is specifically shown as a raw material, and the process flow is as follows:
1) supercritical infiltration: as shown in fig. 1, the particles prepared from PP material of a type commonly used in melt-blown process are placed in a high-pressure reaction kettle, carbon dioxide enters a preheating storage tank from a gas storage tank through a condensing and conveying device and then enters a preheating storage tank through a booster pump to be heated into gas, the gas is pressurized and enters the kettle, the temperature in the kettle is raised, the pressure is increased to 13Mpa, the temperature is about 52 ℃, the carbon dioxide is in a supercritical state and is maintained for 3 hours, then the gas in the kettle is quickly emptied, the PP particles are placed in air and stand for 3 hours, and the treatment is finished.
2) Placing the treated PP particles into a hopper of a screw extruder shown in figure 1, setting the temperatures of all zones of the extruder, namely the zone 1 temperature 175 ℃, the zone 2 temperature 200 ℃, the zone 3 temperature 245 ℃, the zone 4 temperature 245 ℃, the zone 5 temperature 250 ℃, the zone 6 temperature 250 ℃, the zone 7 temperature 250 ℃, the zone 8 temperature 255 ℃, the zone 9 temperature 250 ℃, the zone 10 temperature 250 ℃, the zone 11 temperature 250 ℃, the zone 12 temperature 250 ℃ and the extrusion speed of 20Rpm, metering and inputting the extruded melt into a melt-blown nozzle through a gear metering pump after passing through a melt filter, wherein the pore diameter of each spinneret orifice is selected from small pore diameter of 0.07-0.3mm, hot air is jetted from air orifices on two sides of each spinneret orifice, the hot air rotating speed is 950Rpm, the hot air is generated by air compressor matched with an air heater, a high-voltage insulating plate is fixed on the peripheral side of each spinneret orifice, a high voltage electrostatic field generator is fixed on the far end along the jetting direction, an electrostatic field of 5 ten thousand volts is generated, and fluid jetted from each spinneret orifice is pulled and stretched to a mesh belt receiver, the take-up distance was 170mm, the web speed was 10.5Rpm, and the take-up was then collected by the trim winder.
And whether the materials commonly used for melt-blown non-woven fabrics are suitable for the process is continuously tested, as shown in the following examples.
Example 2
A preparation method of superfine fiber melt-blown fabric comprises the following steps:
1) supercritical infiltration: as shown in figure 1, the granules prepared from PET material polyester of a type commonly used in a melt-blown process are placed in a high-pressure reaction kettle body, carbon dioxide enters a preheating storage tank from a gas storage tank through a condensing and conveying device and then enters a preheating storage tank through a booster pump to be heated into gas, the gas is pressurized and enters the kettle body, the temperature in the kettle body is raised, the pressure is increased to 14Mpa, the temperature is about 35 ℃, the carbon dioxide is in a supercritical state and is maintained for 4 hours, then the gas in the kettle body is quickly emptied, the PET granules are placed in air and are kept stand for 1 hour, and the treatment is finished.
2) Placing the treated PET particles in a hopper of a screw extruder shown in figure 1, setting the temperatures of all zones of the extruder, namely a zone 1 temperature of 170 ℃, a zone 2 temperature of 210 ℃, a zone 3 temperature of 250 ℃, a zone 4 temperature of 250 ℃, a zone 5 temperature of 260 ℃, a zone 6 temperature of 260 ℃, a zone 7 temperature of 260 ℃, a zone 8 temperature of 265 ℃, a zone 9 temperature of 260 ℃, a zone 10 temperature of 260 ℃, a zone 11 temperature of 260 ℃, a zone 12 temperature of 260 ℃ and an extrusion speed of 30Rpm, metering and inputting the extruded melt into a melt nozzle through a gear metering pump after passing through a melt filter, wherein the pore diameter of a spinneret orifice is selected from a small pore diameter of 0.07-0.3mm, hot air is sprayed out from air holes at two sides of the spinneret orifice, the hot air has a hot air rotating speed of 1000Rpm, the hot air is generated by an air compressor matched with an air heater, a high-voltage insulating plate is fixed at the peripheral side of the spinneret orifice, a high-voltage electrostatic field generator is fixed at the far end along the spraying direction, an electrostatic field generator of 5 ten thousand volts is generated, and fluid sprayed out from the spinneret orifice is pulled and stretched to a mesh belt receiver, the take-up distance was 200mm, the web speed was 12Rpm, and then the take-up was collected and wound by the edge trimmer winder.
Example 3
A preparation method of superfine fiber melt-blown fabric comprises the following steps:
1) supercritical infiltration: as shown in figure 1, particles prepared from PBT materials of a type commonly used in a melt-blown process are placed in a high-pressure reaction kettle, carbon dioxide enters a preheating storage tank from a gas storage tank through a condensing and conveying device and then enters a preheating storage tank through a booster pump to be heated into gas, the gas is pressurized and enters the kettle, the temperature in the kettle is raised, the pressure is increased to 15Mpa, the temperature is about 40 ℃, the carbon dioxide is in a supercritical state and is maintained for 3 hours, then the gas in the kettle is quickly emptied, the PBT particles are placed in air and stand for 1.5 hours, and the treatment is finished.
2) Placing the treated PBT particles in a hopper of a screw extruder shown in figure 1, setting the temperatures of all zones of the extruder, namely a zone 1 temperature of 170 ℃, a zone 2 temperature of 210 ℃, a zone 3 temperature of 250 ℃, a zone 4 temperature of 250 ℃, a zone 5 temperature of 260 ℃, a zone 6 temperature of 260 ℃, a zone 7 temperature of 260 ℃, a zone 8 temperature of 265 ℃, a zone 9 temperature of 260 ℃, a zone 10 temperature of 260 ℃, a zone 11 temperature of 260 ℃, a zone 12 temperature of 260 ℃ and an extrusion speed of 30Rpm, metering and inputting the extruded melt into a melt nozzle through a gear metering pump after passing through a melt filter, wherein the pore diameter of a spinneret orifice is selected from a small pore diameter of 0.07-0.3mm, hot air is sprayed out from air holes at two sides of the spinneret orifice, the hot air has a rotating speed of 800Rpm, the hot air is generated by matching an air heater with an air compressor, a high-voltage insulating plate is fixed at the peripheral side of the spinneret orifice, a high-voltage electrostatic field generator is fixed at the far end along the spraying direction, a 3 ten thousand electrostatic field is generated, and fluid sprayed out from the spinneret orifice is pulled and stretched to a mesh belt receiver, the take-up distance was 150mm, the web speed was 10Rpm, and then the take-up was collected and wound by the edge trimmer winder.
Example 4
A preparation method of superfine fiber melt-blown fabric comprises the following steps:
1) supercritical infiltration: as shown in fig. 1, the granules prepared from PE material of a type commonly used in melt-blown process are placed in a high-pressure reactor, carbon dioxide enters a preheating storage tank from a gas storage tank through a condensing and conveying device and then enters a preheating storage tank through a booster pump, the carbon dioxide is heated into gas, the gas is pressurized and enters a reactor, the temperature in the reactor is raised, the pressure is increased to 16Mpa, the temperature is about 52 ℃, the carbon dioxide is in a supercritical state and is maintained for 3 hours, then the gas in the reactor is rapidly evacuated, the PE granules are placed in air and are kept stand for 1 hour, and the treatment is completed.
2) Placing the treated PBT particles in a hopper of a screw extruder shown in figure 1, setting the temperatures of all zones of the extruder, namely a zone 1 temperature of 160 ℃, a zone 2 temperature of 200 ℃, a zone 3 temperature of 230 ℃, a zone 4 temperature of 230 ℃, a zone 5 temperature of 240 ℃, a zone 6 temperature of 240 ℃, a zone 7 temperature of 240 ℃, a zone 8 temperature of 240 ℃, a zone 9 temperature of 240 ℃, a zone 10 temperature of 240 ℃, a zone 11 temperature of 240 ℃, a zone 12 temperature of 240 ℃ and an extrusion speed of 27Rpm, metering and inputting the extruded melt into a melt nozzle through a gear metering pump after passing through a melt filter, wherein the pore diameter of a spinneret orifice is selected from small pore diameter of 0.07-0.3mm, hot air is sprayed out from wind orifices on two sides of the spinneret orifice, the hot air is generated at a hot air rotating speed of 1100Rpm, the hot air is generated by matching an air heater with an air compressor, a high-voltage insulating plate is fixed on the peripheral side of the spinneret orifice, a high-voltage electrostatic field generator is fixed on the far end along the spraying direction, an electrostatic field generator of 5 ten thousand volts is generated, and fluid sprayed out from the spinneret orifice is pulled and stretched to a mesh belt receiver, take-up distance 210mm, web speed 15Rpm, then collect-wound by trim winder.
The nonwoven prepared in the above example was measured by magnifying 1000 times with an optical microscope, measuring the diameters of the 100 stops and taking the average value, and the filtration effect was tested as follows:
it can be seen that the process is suitable for various materials used by melt-blown fabrics and is suitable for forming superfine fiber non-woven fabrics.
In addition, the test set up in example 1 examined the effect of different parameter sets on meltblown fibers as shown in the following table:
in which the fiber diameter test: the measurement was performed by optical microscopy at 1000 x magnification, and the diameters of the 100 stops were measured and averaged.
And (3) viscosity testing: the polymer viscosity was measured using an ARES-G2 rotational rheometer under a nitrogen blanket with the shear rate increasing from 0.1rad/s to 100rad/s at 230 ℃ with plate spacings of 1mm to 0.6 mm.
Fiber crystallinity test: and an XED-6000X-ray diffractometer is adopted to test the crystallization performance of the crystal.
And (3) testing the filtering effect: PFT-0 adopting melt-blown fabric filtering performance tester1, particulate matter concentration: 20-30mg/m3Salt particles (0.075 + -0.02) μm, oil particles (0.185 + -0.02) μm.
It can be seen from the table that the particle viscosity was about 4.0 before the supercritical foaming treatment, the fiber diameter was 3.5 μm or more after the high-voltage electrostatic field drawing, and the crystallinity was about 23.35%.
As shown in 5-13, after the supercritical infiltration treatment, the crystallinity is reduced, the filtering effect is greatly improved, and it can be seen that the fiber diameter is reduced to below 1 μm along with the increase of the pressure intensity, the infiltration time is prolonged, and the filtering effect is gradually improved, because the inside of the polymer material is subjected to the supercritical carbon dioxide infiltration treatment, and a large amount of saturated gas is contained, micro bubble holes can appear on the surface of the fiber in the melt spinning process, so that the roughness of the fiber is increased, the porosity of the fiber is favorably improved, and the filtering effect is further influenced, in addition, the supercritical carbon dioxide has a strong plasticizing effect on the polymer, the melt viscosity of the polymer material is further reduced, and the polymer material is more suitable for a traction effect with a weaker melt-blown process.
As shown in FIGS. 14 to 16, when the raw material is foamed after the permeation of supercritical carbon dioxide, the diameter of the formed fiber is generally 1 μm or less, and the filtration effect is excellent.
The reason is explored, and the micro bubble holes on the surface of the fiber can be further improved after foaming treatment, so that the roughness of the fiber is increased, the porosity of the fiber is favorably improved, the filtering effect is further influenced, the plasticizing effect on high polymers is favorably enhanced, the melt viscosity of the high polymer material is further reduced, the high polymer material is more suitable for the traction effect weaker in the melt-blowing process, and the superfine fiber with the fiber diameter lower than 1 micron is prepared.
Above only the utility model discloses an it is preferred embodiment, the utility model discloses a scope of protection not only limits in above-mentioned embodiment, and the all belongs to the utility model discloses a technical scheme under the thinking all belongs to the utility model discloses a scope of protection. It should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (5)
1. A melt-blown fabric preparation device comprises a melt-blown non-woven fabric manufacturing device, and is characterized in that: also comprises
A reaction kettle body, which is used for permeating and treating raw materials used by a melt-blown non-woven fabric manufacturing device by carbon dioxide in a supercritical state;
and an electrostatic field generating device is arranged between a melt-blowing nozzle and a receiving device in the melt-blowing non-woven fabric manufacturing device, and fluid sprayed from the melt-blowing nozzle is drawn and stretched to the receiving device under the action of high-temperature hot air flow and static electricity.
2. The meltblown fabric preparation apparatus of claim 1, wherein: the electrostatic field generating device comprises a high-voltage insulating plate and a high-voltage electrostatic field generator, wherein the high-voltage insulating plate is arranged on the periphery of a spinneret orifice of the melt-blown nozzle, the high-voltage electrostatic field generator is arranged at the far end of the spraying direction of the spinneret orifice, and a movable receiving part in the receiving device penetrates through the high-voltage electrostatic field generator and the high-voltage insulating plate.
3. The meltblown fabric preparation apparatus of claim 2, wherein: the receiving device is a mesh belt receiver, the mesh belt is used as a mobile receiving part, and the mesh belt passes between the high-voltage electrostatic field generator and the high-voltage insulating plate to receive the fiber wires.
4. The meltblown fabric preparation apparatus of claim 1, wherein: electric field voltage generated by the electrostatic field generating device: 1 ten thousand volts to 8 ten thousand volts.
5. The meltblown fabric preparation apparatus of claim 1, wherein: the melt-blown non-woven fabric manufacturing device comprises a screw extruder, a filtering device, a metering pump, a melt-blown die head assembly and a receiving device.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202022527849.8U CN213896228U (en) | 2020-11-04 | 2020-11-04 | Melt-blown fabric preparation facilities |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202022527849.8U CN213896228U (en) | 2020-11-04 | 2020-11-04 | Melt-blown fabric preparation facilities |
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| CN213896228U true CN213896228U (en) | 2021-08-06 |
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