Manufacturing method of high-efficiency meltblown non-woven fabric and its extrusion equipment

Abstract

A method for manufacturing a high-efficiency meltblown non-woven fabric and its extrusion equipment, wherein the manufacturing method includes the following steps: providing raw materials; heating and liquefying the raw materials and then spraying them out to form a plurality of meltblown filaments; cooling, collecting and shaping the meltblown filaments to form a meltblown non-woven fabric; blowing hot air on the meltblown non-woven fabric; and performing electrostatic electret treatment on the meltblown non-woven fabric to form a high-efficiency meltblown non-woven fabric. The high-efficiency meltblown non-woven fabric is tested for its filtration efficiency and pressure difference at air flow rates of 32 LPM and 8 LPM respectively, and the filtration efficiency is increased from 86.0% to 95.0% on average (the filtration efficiency is increased by 10.47%), and the pressure difference is reduced from 2.3 mmH2O / cm 2 to 2.1 mmH2O / cm 2 (the pressure difference is reduced by 8.70%). Thus, the high-efficiency meltblown non-woven fabric has the characteristics of high filtration efficiency and high air permeability (i.e., low pressure difference).

Description

Technical Field

[0001] The present invention relates to the technical field of meltblown non-woven fabric manufacturing and its equipment, and particularly to a manufacturing method for high-efficiency meltblown non-woven fabric and its extrusion equipment. Background Art

[0002] Meltblown non-woven fabric (also known as "meltblown non-woven cloth"), known as the "heart of masks", is made by heating and dispersing plastics at high speed to melt them, and then spinning the polymer melt through a spinneret of an ultra-fine nozzle to form a high-performance polypropylene meltblown filter material with finer fibers than other materials. Through the electrostatic electret technology, the meltblown non-woven fabric fibers adsorb static electricity, enabling them to adsorb viruses, bacteria or dust passing through the surface layer, thereby improving the filtration efficiency of masks and other filtration products.

[0003] A general meltblown non-woven fabric extrusion equipment (also known as "meltblown non-woven fabric extrusion equipment" or "production equipment for meltblown non-woven fabric") includes a feeding mechanism, an extruder, a forming machine, an electret treatment machine and a winding machine. The feeding mechanism stores and supplies a sufficient amount of plastic raw materials; the extruder heats and liquefies the raw materials in the screw and then sprays them through an ultra-fine nozzle to form extremely fine fibers; the forming machine vertically blows the extremely fine fibers onto a collecting net, cools, collects and shapes them, piling them up into an ultra-fine fiber network structure; the electret treatment machine performs electrostatic electret treatment on the ultra-fine fiber network structure to form a meltblown filter non-woven fabric (also known as "meltblown filter non-woven cloth").

[0004] When testing the filtration efficiency (filtration rate) and pressure difference (air exchange pressure difference) of the meltblown filter non-woven fabric obtained by the above equipment, a meltblown filter non-woven fabric with a basis weight of 25 ± 3 gsm is selected. At an average ambient temperature of 35.8 °C and a relative humidity of 45%, it is tested at an air flow rate of 32 liters per minute (LPM), and the average filtration efficiency is measured to be 86.0%. When tested at an air flow rate of 8 liters per minute (LPM), the average pressure difference is measured to be 2.3 mmHg2O / cm 2 It can be seen that although it has a relatively low pressure difference, its filtration efficiency is relatively low, the effect of adsorbing viruses and bacteria passing through the surface layer is poor, and it has a low protection efficiency.

[0005] Furthermore, in the process of heating and liquefying the raw materials by the extruder, it is necessary to wait until the heating is complete before starting subsequent processing operations. And after the raw materials are used up for heating, it is necessary to supplement the raw materials manually, which will lead to a slow production rate. In addition, if the raw materials are wet or the environmental humidity is too high, it will also affect the product quality and yield (i.e., product qualification rate). Summary of the Invention

[0006] One of the objectives of the present invention is to provide a method for manufacturing a high-efficiency meltblown non-woven fabric and its extrusion equipment (also known as "high-efficiency meltblown non-woven fabric extrusion equipment" or "high-efficiency meltblown non-woven fabric production equipment"), which blows hot air on the meltblown non-woven fabric through an air bed to quickly remove the moisture and dampness inside the meltblown non-woven fabric, and performs electrostatic electret treatment through an electret treatment machine to form a high-efficiency meltblown non-woven fabric.

[0007] Another objective of the present invention is to provide a method for manufacturing a high-efficiency meltblown non-woven fabric and its extrusion equipment, wherein the average filtration efficiency of the high-efficiency meltblown non-woven fabric is increased from 86.0% to 95.0% (the filtration efficiency is increased by 10.47%) after filtration efficiency testing, and it has a high filtration efficiency and high protection efficiency.

[0008] A third objective of the present invention is to provide a method for manufacturing a high-efficiency meltblown non-woven fabric and its extrusion equipment, wherein the average pressure difference of the high-efficiency meltblown non-woven fabric is reduced from 2.3 mmH2O / cm 2 to 2.1 mmH2O / cm 2 (the pressure difference is reduced by 8.70%), and it has high air permeability, that is, low pressure difference characteristics while having a high filtration efficiency.

[0009] In order to achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0010] A high-efficiency meltblown non-woven fabric extrusion equipment includes a feeding system for storing and supplying a sufficient amount of raw materials; an extruder, which includes a heating device and a meltblown die head, and the heating device heats and liquefies the raw materials in the screw and then sprays them out through the meltblown die head into a plurality of meltblown filaments; a forming machine, which has a collector screen to cool, collect and shape the meltblown filaments into a meltblown non-woven fabric; an air bed for blowing hot air on the meltblown non-woven fabric; and an electret treatment machine located behind the air bed for performing electrostatic electret treatment on the meltblown non-woven fabric to form a high-efficiency meltblown non-woven fabric (also known as "high-efficiency meltblown non-woven fabric").

[0011] Preferably, the high-efficiency meltblown non-woven fabric extrusion equipment further includes a coiler, which is arranged corresponding to the electret treatment machine to wind up the high-efficiency meltblown non-woven fabric.

[0012] Preferably, the feeding system includes an automatic suction machine and a storage dryer, and the automatic suction machine sucks the raw materials into the storage dryer for prior drying treatment.

[0013] Preferably, the air bed includes a bed frame and an air duct installed on the bed frame. The air duct is arranged corresponding to the meltblown non-woven fabric, and the air duct is a porous air duct or a multi-nozzle air duct.

[0014] A method for manufacturing a high-efficiency meltblown non-woven fabric, comprising the following steps: providing raw materials; heating and liquefying the raw materials and then spraying them out to form a plurality of meltblown filaments; cooling, collecting and shaping the meltblown filaments to form a meltblown non-woven fabric; blowing hot air on the meltblown non-woven fabric; and performing electrostatic electret treatment on the meltblown non-woven fabric to form a high-efficiency meltblown non-woven fabric.

[0015] Preferably, the manufacturing method further comprises the following step: winding up the high-efficiency meltblown non-woven fabric.

[0016] Preferably, after the step of providing raw materials in the manufacturing method, the following steps are further included: drying the raw materials.

[0017] Preferably, the step of blowing hot air on the meltblown non-woven fabric in the manufacturing method further comprises: blowing hot air on the meltblown non-woven fabric from bottom to top.

[0018] Preferably, the step of blowing hot air on the meltblown non-woven fabric in the manufacturing method further comprises: blowing hot air on the meltblown non-woven fabric.

[0019] Preferably, the step of blowing hot air on the meltblown non-woven fabric in the manufacturing method further comprises: blowing inert gas on the meltblown non-woven fabric.

[0020] In view of the above technical features, the present invention has the following beneficial effects:

[0021] (1) By using hot air technology to blow hot air on the meltblown non-woven fabric, the internal moisture, dampness and odor are effectively removed, and while improving its filtration efficiency, it also has the characteristics of high air permeability, that is, low pressure difference.

[0022] (2) Drying the raw materials to shorten the process time, accelerate the production rate, and at the same time improve the quality and yield of the product (i.e., the product qualification rate).

[0023] (3) Winding up the high-efficiency meltblown non-woven fabric, and it can be wound into individual rolls separately for transportation and production.

[0024] (4) The production extrusion process speed reaches 10-100 m / min, the width is 600-3200 mm, and the maximum production capacity can reach 500 KG / H, with high output and low cost. Description of the Drawings

[0025] Figure 1 It is a schematic plan view of the high-efficiency meltblown non-woven fabric extrusion equipment in Example 1.

[0026] Figure 2A It is a three-dimensional perspective schematic view of the air bed in Example 1.

[0027] Figure 2B It is Figure 2A The front view of the use state.

[0028] Figure 3Flow chart (1) of the manufacturing method of the high-efficiency meltblown non-woven fabric in Embodiment 1.

[0029] Figure 4 Flow chart (2) of the manufacturing method of the high-efficiency meltblown non-woven fabric in Embodiment 2.

[0030] Figure 5 Flow chart (3) of the manufacturing method of the high-efficiency meltblown non-woven fabric in Embodiment 3.

[0031] In the figure:

[0032] 10. Feeding system; 11. Raw material

[0033] 13. First automatic suction feeder; 13'. Second automatic suction feeder;

[0034] 15. Storage dryer;

[0035] 20. Extruder; 21. Heating device;

[0036] 23. Meltblown die head; 30. Forming machine;

[0037] 31. Collector screen; 40. Air bed;

[0038] 41. Air duct; 411. Air injection hole;

[0039] 43. Bed frame; 50. Electret treatment machine;

[0040] 60. Rewinder; 70. Meltblown filaments;

[0041] 80. Meltblown non-woven fabric; 90. High-efficiency meltblown non-woven fabric;

[0042] Steps (S101 to S110). Detailed implementation manners

[0043] The applicant hereby states that all the adjectives related to directions such as inside, outside, above, below, left, right, or top, bottom, etc. referred to throughout the specification are based on the directions in the drawings of the present invention.

[0044] The structure and its characteristic functions of the present invention will be described in detail below with reference to the listed embodiments and the accompanying drawings. First, in the following described embodiments and drawings, the same reference numerals represent the same or similar elements, components, objects, structures or devices, which are hereby stated in advance.

[0045] The present invention will be further described below in conjunction with specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and not to limit the scope of the present invention. In addition, it should be understood that after reading the content taught by the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms also fall within the scope defined by the appended claims of this application.

[0046] Please refer to Figure 1 、 Figure 2A and Figure 2B , Specific Embodiment 1. This Embodiment 1 provides a high-efficiency meltblown non-woven fabric extrusion device, which includes a feeding system 10, an extruder 20, a forming machine 30, an air bed 40 and a charge storage treatment machine 50, which are described as follows:

[0047] The feeding system 10 stores and supplies a sufficient amount of raw materials 11. The feeding system 10 includes a first automatic suction machine 13, a second automatic suction machine 13' and a storage dryer 15. The first automatic suction machine 13 sucks the raw materials 11 into the storage dryer 15 for drying treatment first, and then through the second automatic suction machine 13', the dried raw materials 11 are sucked into the extruder 20 for heating. The feeding system 10 may further include a storage tank for pre-storing the raw materials 11. The storage dryer 15 includes a storage barrel, a condenser and a heat exchange device, etc., and has functions such as drying and dehumidifying. Among them, the raw materials 11 include a charge storage agent (or charge storage masterbatch), and use polypropylene (PP) resin / masterbatch / granules (Polymer Chips) or high molecular materials as the main raw materials. The color of the polypropylene (PP) masterbatch can be white. The raw materials 11 may further include a color masterbatch and a dispersant. The color masterbatch can be, for example, a black masterbatch, and the dispersant is used to uniformly disperse the color masterbatch.

[0048] The extruder 20 includes a heating device 21 and a meltblown die head 23. The heating device 21 heats and liquefies the raw materials 11 in the screw and then sprays them out through the meltblown die head 23 into a plurality of meltblown filaments 70. The meltblown die head 23 includes an ultra-fine nozzle and its spinneret plate, and the aperture range High production efficiency and good quality. The molten molecular raw materials 11 are extruded into a high-speed hot air stream through the extruder 20, and then the polymer raw material 11 melt is spun out through the spinneret plate of the ultra-fine nozzle to form meltblown filaments 70 of extremely fine fibers, and through the air duct design, they are vertically blown onto the forming machine 30.

[0049] The forming machine 30 has a collector screen 31. The meltblown filaments 70 are vertically blown onto the collector screen 31, cooled, collected and shaped, and piled up into an ultra-fine fiber network structure to form a meltblown non-woven fabric 80. A linear track is provided at the bottom of the forming machine 30, and the forming machine 30 can move linearly along the track to facilitate adjusting the position of the collector screen 31 so that the meltblown filaments 70 are spray-formed.

[0050] The air bed 40 includes a bed frame 43 and an air duct 41 installed above it. The air duct 41 is a porous air duct 41 or a multi-jet hole air duct 41, which has an air inlet and a plurality of air blowing holes 411 (such as Figure 2A shown), and these air blowing holes 411 are arranged in an array and are correspondingly arranged opposite to the melt-blown non-woven fabric 80. Among them, the cross-section of the air duct 41 can be circular, square, rectangular or oval, and the air blowing holes 411 can be circular, square, rectangular or oval.

[0051] The electret treatment machine 50 is located behind the air bed 40 and is used to perform electrostatic electret treatment on the melt-blown non-woven fabric 80 added with an electret to form a high-efficiency filtration melt-blown non-woven fabric 90. The electret refers to a dielectric material with the function of storing charges for a long time, and has the advantages of high efficiency, low flow resistance, antibacterial energy saving, etc. The electret treatment machine 50 includes electrodes, rollers, electrostatic generators, step-up transformers, electret treatment frames, etc., and its operation is simple and the output voltage is stable.

[0052] It should only be noted that the position of the air bed 40 between the forming machine 30 and the electret treatment machine 50 can be in the front section, the rear section or the middle section, that is, it can be set adjacent to the forming machine 30 or adjacent to the electret treatment machine 50 or set in the center between the two. The air bed 40 can also be set at the front section, the middle section and the rear section at the same time.

[0053] A high-efficiency filtration melt-blown non-woven fabric extrusion device of the first embodiment further includes a coiler 60, which is arranged corresponding to the electret treatment machine 50 and is used to wind up the high-efficiency filtration melt-blown non-woven fabric 90, and can be wound into individual rolls in strips for transportation and production.

[0054] When using a high-efficiency filtration melt-blown non-woven fabric extrusion device of the first embodiment, the molten molecular raw material 11 is heated and extruded into the air stream at a high speed by the extruder 20, and then the polymer raw material 11 melt is spun out through the spinneret of the ultra-fine nozzle to form a melt-blown filament floc 70 of extremely fine fibers, and then it is vertically blown onto the collector screen 31 to form an ultra-fine fiber network structure and form a melt-blown non-woven fabric 80. According to the fiber diameter produced, a high output rate can be achieved, the extrusion process speed reaches 10 m / min to 100 m / min (meters per minute), the width is 600 mm to 3200 mm (millimeters), and the maximum production capacity can reach 500 KG / H (kilograms per hour). The extremely fine fibers of the melt-blown non-woven fabric 80 are made into a high-efficiency filtration melt-blown non-woven fabric 90 through hot air treatment and electrostatic electret technology. The fibers are charged and can adsorb viruses and bacteria passing through the surface layer, and the filtration efficiency is as high as 95.0%.

[0055] When using the air bed 40, such as Figure 2BAs shown, the air bed 40 is arranged below the meltblown non-woven fabric 80 and the air duct 41 is arranged adjacent to the meltblown non-woven fabric 80. Hot air is blown upward from the lower part through the air holes 411 of the air duct 41 to blow hot air on the meltblown non-woven fabric 80, so as to quickly remove moisture, dampness and peculiar smell inside the meltblown non-woven fabric 80. Preferably, the hot air temperature is controlled between and, and due to the characteristic that hot air will flow upward, the blowing method from bottom to top is adopted, which can make the meltblown non-woven fabric 80 receive wind more evenly. In addition, the air duct 41 can also be arranged above the meltblown non-woven fabric 80 to blow hot air on the meltblown non-woven fabric 80 from top to bottom, or air ducts 41 can be arranged on both the upper and lower sides of the meltblown non-woven fabric 80. Among them, hot air can be used to blow the meltblown non-woven fabric 80 or nitrogen, inert gas, etc. can be used to blow the meltblown non-woven fabric 80, but it is not limited. Because nitrogen and inert gas have the characteristics of not being easy to react with other substances and are relatively stable in nature, better effects can usually be obtained by using them.

[0056] In addition, the air bed 40 can also include a pressure controller (not shown in the drawings) and a flow controller (not shown in the drawings). The pressure controller is used to control the pressure of the hot air blown out by the air duct 41 to maintain a certain value. If the pressure is too high or too low, an alarm sound will be generated. The flow controller is used to control the flow rate of the hot air blown out by the air duct 41. Furthermore, the air bed 40 can also include a screen (not shown in the drawings), which is arranged above the air duct 41 to evenly disperse the hot air blown out by the air duct 41, so that the meltblown non-woven fabric 80 is heated more evenly. Thus, the prepared high-efficiency meltblown non-woven fabric 90 has higher filtration efficiency and lower pressure difference.

[0057] Furthermore, various different colors of high-efficiency meltblown non-woven fabric 90 can be produced by a high-efficiency meltblown non-woven fabric extrusion device of Embodiment 1. When using the polypropylene PP masterbatch raw material 11 with the color of white, the white high-efficiency meltblown non-woven fabric 90 can be produced. When it is desired to produce the high-efficiency meltblown non-woven fabric 90 in gray or black, about 2% - 5% of black masterbatch is added to the raw material 11, and the high-efficiency meltblown non-woven fabric 90 in gray or black can be produced. If color masterbatch of other colors is added, high-efficiency meltblown non-woven fabric 90 of other colors can be produced.

[0058] Please refer to Figure 3 , the present invention provides a method for manufacturing a high-efficiency meltblown non-woven fabric, including the following steps:

[0059] Step S101: Provide the raw material 11. The raw material 11 contains an electret (or electret masterbatch), and uses polypropylene (PP) resin / masterbatch / granules (Polymer Chips) or high molecular materials as the main raw materials. The natural color of the polypropylene (PP) masterbatch is white. In addition, color masterbatch and dispersant can be added and mixed with the raw material 11. The color masterbatch can be, for example, black masterbatch (2% - 5%), and the dispersant is used to evenly disperse the color masterbatch in the raw material 11.

[0060] Step S103: Heat and liquefy the raw material 11 and then eject it to form a plurality of meltblown filaments 70. The molten molecular raw material 11 is extruded into a high-speed hot air stream, and then the melt of the polymer raw material 11 is spun out. After forming the meltblown filaments 70 of extremely fine fibers, they are blown vertically downward.

[0061] Step S105: Cool, collect, and shape the meltblown filaments 70, stack them into an ultra-fine fiber network structure, and form the meltblown non-woven fabric 80.

[0062] Step S107: Blow hot air on the meltblown non-woven fabric 80 to quickly remove moisture, dampness, and peculiar smell inside the meltblown non-woven fabric 80. Preferably, blow hot air on the meltblown non-woven fabric 80 from bottom to top, or blow hot air on the meltblown non-woven fabric 80 from top to bottom, or blow hot air on the meltblown non-woven fabric 80 from top and bottom simultaneously. Among them, hot air can be used to blow the meltblown non-woven fabric 80, or nitrogen or inert gas can be used to blow hot air on the meltblown non-woven fabric 80, but it is not limited.

[0063] Step S109: Perform electrostatic electret treatment on the meltblown non-woven fabric 80 to form a high-efficiency filtration meltblown non-woven fabric 90. Perform electrostatic electret treatment on the meltblown non-woven fabric 80 added with an electret agent to make it carry a single charge (such as a positive charge or a negative charge). The electret agent refers to a dielectric material with the function of storing charges for a long time, and has advantages such as high efficiency, low flow resistance, antibacterial and energy-saving. The electrostatic electret treatment makes the meltblown non-woven fabric 80 carry charges and form a large number of electrodes to attract charged particles in the environment. At the same time, it can also polarize some uncharged particles, and then adsorb some small-particle pollutants. Even viruses at the nanometer level (or "nanoscale") can be electrostatically adsorbed or blocked by charge repulsion.

[0064] When testing its filtration efficiency (filtering efficiency) and pressure difference (air exchange pressure difference), select the high-efficiency filtration meltblown non-woven fabric 90 with a basis weight of 25 ± 3 gsm. At an average ambient temperature of 35.8 °C and a relative humidity of 45%, the pressure difference is based on an air flow rate of 8 liters per minute (LPM), and the filtration efficiency (PFE) is based on an air flow rate of 32 liters per minute (LPM) for each roll Take multiple ([[]] pieces, each 17.5 cm) for testing, and obtain the experimental data as shown in Table 1 below:

[0065] Table 1

[0066]

[0067]

[0068] As can be seen from Table 1, by blowing hot air through the air bed 40 onto the melt-blown non-woven fabric 80, the moisture and dampness inside the melt-blown non-woven fabric 80 are effectively removed, and the high-efficiency filtration melt-blown non-woven fabric 90 produced by electrostatic electret treatment with the electret treatment machine 50 is tested, and its average filtration efficiency is measured to be 95.0%, and the average pressure difference is 2.1 mmH2O / cm 2 .

[0069] Under the same above-mentioned test environment and conditions, for the melt-blown non-woven fabric 80 that has not been blown with hot air and has been electrostatically electret-treated, the experimental data are measured as shown in Table 2 below:

[0070] Table 2

[0071]

[0072] As can be seen from Table 2, for the melt-blown non-woven fabric 80 that has not been blown with hot air and has been electrostatically electret-treated, after testing, its average filtration efficiency is measured to be 86.0%, while the average pressure difference is 2.3 mmH2O / cm 2 . Comparing Table 1 and Table 2, it can be seen that the high-efficiency filtration melt-blown non-woven fabric 90 produced by the high-efficiency filtration melt-blown non-woven fabric extrusion equipment and its manufacturing method of Example 1 has an average filtration efficiency increased from 86.0% to 95.0% (the filtration efficiency is increased by 10.47%) compared with the melt-blown non-woven fabric 80 that has not been blown with hot air and has been electrostatically electret-treated, and the average pressure difference is reduced from 2.3 mmH2O / cm 2 to 2.1 mmH2O / cm 2 (the pressure difference is reduced by 8.70%). Therefore, the high-efficiency filtration melt-blown non-woven fabric 90 produced by the high-efficiency filtration melt-blown non-woven fabric extrusion equipment and its manufacturing method of Example 1 has high air permeability, that is, low pressure difference characteristics while having high filtration efficiency. The calculation formulas for the filtration efficiency and pressure difference improvement rates can be referred to as follows:

[0073] Filtration efficiency improvement rate F% = {(F1 - F0) / F0} × 100, where F1 = the filtration efficiency of the high-efficiency filtration melt-blown non-woven fabric 90 after blowing and electrostatic electret treatment; F0 = the filtration efficiency of the melt-blown non-woven fabric 80 that has not been blown and has been electrostatically electret-treated.

[0074] Pressure difference improvement rate P% = {(P1 - P0) / P0} × 100, where P1 = the pressure difference of the high-efficiency filtration melt-blown non-woven fabric 90 after blowing and electrostatic electret treatment; P0 = the pressure difference of the melt-blown non-woven fabric 80 that has not been blown and has been electrostatically electret-treated.

[0075] Such as Figure 4As shown in the specific embodiment 2, this embodiment 2 provides a method for manufacturing a high-efficiency meltblown non-woven fabric. This embodiment 2 is substantially the same as the foregoing embodiment 1, and the difference lies in that: after step S109, it further includes step S110: winding up the high-efficiency meltblown non-woven fabric 90. The high-efficiency meltblown non-woven fabric 90 is wound up and can be individually wound into strips for transportation and production. It also has the same functions and effects as described above.

[0076] As Figure 5 shown in the specific embodiment 3, this embodiment 3 provides a method for manufacturing a high-efficiency meltblown non-woven fabric. This embodiment 3 is substantially the same as the foregoing embodiments, and the difference lies in that: after step S101, it further includes step S102: drying the raw material 11. The raw material 11 is dried to reduce the moisture in the raw material 11 to facilitate improving the thermal melting efficiency. Thereby, the process time is shortened, the production speed is accelerated, and at the same time, the quality and yield of the product are improved. It also has the same functions and effects as described above.

[0077] It should only be noted that the high-efficiency meltblown non-woven fabric 90 produced by the present invention is very suitable for composite products that require filtration, shielding, heat insulation, and oil absorption properties, such as: mask materials, air and liquid filtration materials, thermal insulation materials, isolation materials, sound insulation materials, environmental protection oil absorption materials, and wiping cloths, etc., but not limited thereto.

[0078] In summary, the present invention has the following effects compared with the prior art: The high-efficiency meltblown non-woven fabric 90 is tested for filtration efficiency and differential pressure. Its average filtration efficiency is increased from 86.0% to 95.0% (the filtration efficiency is increased by 10.47%), and the average differential pressure is reduced from 2.3 mmH2O / cm 2 to 2.1 mmH2O / cm 2 (the differential pressure is reduced by 8.70%). While having high filtration efficiency, it can also maintain high air permeability, that is, low differential pressure characteristics. Moreover, it can shorten the process time, accelerate the production rate, improve the product quality and yield, and has high output and low cost. It truly achieves the purpose of the present invention.

[0079] The above are only the preferred embodiments of the present invention, and do not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the specification and drawings of the present invention, or directly or indirectly applied to other related technical fields, shall be equally included in the patent protection scope of the present invention.

Claims

1. A high filtration efficiency meltblown non-woven fabric extrusion device, characterized in that: The high-efficiency meltblown non-woven fabric extrusion equipment includes: A feeding system that stores and supplies a sufficient amount of raw materials. The feeding system includes at least one automatic material suction machine and a storage dryer. The automatic material suction machine sucks the raw materials into the storage dryer for drying treatment; An extruder that includes a heating device and a meltblown die head. The heating device heats and liquefies the raw materials in the screw and then sprays them out through the meltblown die head to form a plurality of meltblown filaments; A forming machine that has a collector screen to cool, collect, and shape the meltblown filaments to form a meltblown non-woven fabric; A wind bed that is arranged below the meltblown non-woven fabric and blows hot air on the meltblown non-woven fabric. Among them, the wind bed includes a bed frame and an air duct mounted on the bed frame. The air duct is located below the meltblown non-woven fabric and is adjacent to the meltblown non-woven fabric. The air duct is a porous air duct or a multi-nozzle air duct, which has at least one air inlet and a plurality of blow holes communicating with the air inlet. These blow holes are arranged in arrays and are arranged corresponding to the meltblown non-woven fabric. Hot air blows hot air on the meltblown non-woven fabric from bottom to top through the air duct via these blow holes, and the hot air temperature is controlled between 50 and 60 °C; and An electret treatment machine that is located behind the wind bed and is used to perform electrostatic electret treatment on the meltblown non-woven fabric to form a high-efficiency meltblown non-woven fabric.

2. The high-efficiency meltblown non-woven fabric extrusion device according to claim 1, characterized in that: The high-efficiency meltblown non-woven fabric extrusion equipment further includes a coiler that is arranged corresponding to the electret treatment machine to wind up the high-efficiency meltblown non-woven fabric.

3. A method for manufacturing a high-efficiency meltblown non-woven fabric, using the high-efficiency meltblown non-woven fabric extrusion equipment described in claim 1 or 2, includes the following steps: Providing raw materials and drying the raw materials; Heating and liquefying the raw materials and then spraying them out to form a plurality of meltblown filaments; Cooling, collecting, and shaping the meltblown filaments to form a meltblown non-woven fabric; Blowing hot air on the meltblown non-woven fabric, wherein hot air or nitrogen or inert gas blows hot air on the meltblown non-woven fabric from bottom to top and makes the meltblown non-woven fabric evenly receive the wind; And The melt-blown nonwoven fabric is subjected to electrostatic electret treatment to form a high-filtration-efficiency melt-blown nonwoven fabric. Among them, the high-filtration-efficiency melt-blown nonwoven fabric is tested, and its average filtration efficiency is increased from 86.0% to 95.0%, that is, the filtration efficiency is increased by 10.47%. Its average pressure difference is reduced from 2.3 mmH2O / cm 2 to 2.1 mmH2O / cm 2 , that is, the pressure difference is reduced by 8.70%, so it has high filtration efficiency and high air permeability, that is, low pressure difference.

4. The manufacturing method of a high filtration efficiency meltblown non-woven fabric according to claim 3, characterized in that: The manufacturing method includes winding up the high-efficiency meltblown non-woven fabric.

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