Reusable three-component elastic non-woven fabric and production process thereof

Abstract

The present application relates to the field of textile technology, and specifically discloses a reusable three-component elastic non-woven fabric and its production process. A reusable three-component elastic non-woven fabric comprises an upper elastic layer, a middle filter layer and a lower support layer; the upper elastic layer is a two-component meltblown fabric; the middle filter layer is a polypropylene meltblown fabric; the lower support layer is a polyester spunbond non-woven fabric; its preparation method is as follows: the polyester spunbond non-woven fabric is pleated to form wrinkles, and then subjected to heat setting treatment to obtain a pleated polyester spunbond non-woven fabric; the polypropylene meltblown fabric is compounded with the pleated polyester spunbond non-woven fabric to obtain a composite non-woven fabric; the two-component meltblown fabric is compounded with the composite non-woven fabric to obtain a reusable three-component elastic non-woven fabric. The reusable three-component elastic non-woven fabric of the present application has high fluffiness, good elasticity, high dust holding capacity and good backwashing effect, and can significantly improve the service life of the filter material.

Description

Technical Field

[0001] The present application relates to the field of textile technology, and more particularly, to a reusable three-component elastic nonwoven fabric and a production process thereof. Background Art

[0002] With the series of achievements made in reform and opening up, my country's economy has achieved leapfrog development, people's living standards have been continuously improved, and people are increasingly yearning for high-quality life. More and more high-efficiency air filters have entered residents' homes.

[0003] Air filters in my country are categorized into coarse, medium, high, sub-high, and high efficiency air filters. Coarse and medium efficiency filters require less precise filtration, filter larger dust particles, and are easier to clean. High, medium, sub-high, and high efficiency air filters require higher precision, filter mostly very small dust particles, and are difficult to clean, typically requiring external cleaning before use.

[0004] However, the filter elements of high-efficiency, sub-high-efficiency, and high-efficiency air filters are typically made of a composite non-woven fabric made of polypropylene meltblown fabric and polyester spunbond non-woven fabric. This is very rigid and has almost no elasticity. External forces can easily damage the filter element, rendering it inoperable. Therefore, high-efficiency, sub-high-efficiency, and high-efficiency filters need to be replaced after a single use. Summary of the Invention

[0005] In order to increase the service life of high-efficiency, sub-high-efficiency and high-efficiency filters, the present application provides a reusable three-component elastic non-woven fabric and a production process thereof.

[0006] In a first aspect, the present application provides a reusable three-component elastic nonwoven fabric, which adopts the following technical solution:

[0007] A reusable three-component elastic nonwoven fabric comprising an upper elastic layer, a middle filter layer and a lower support layer;

[0008] The upper elastic layer is a two-component melt-blown fabric;

[0009] The middle filter layer is a polypropylene melt-blown cloth;

[0010] The lower support layer is a polyester spunbond nonwoven fabric;

[0011] The two-component melt-blown cloth is prepared by a melt-blowing method from components including polypropylene masterbatch, elastomer masterbatch and maleic anhydride grafted polypropylene copolymer.

[0012] Polypropylene meltblown cloth is a material with good filtering, shielding, thermal insulation and oil absorption properties. It can be used in air and liquid filtration materials, isolation materials, mask materials, thermal insulation materials, oil absorption materials and wiping cloths.

[0013] By adopting the above technical scheme, polypropylene meltblown cloth is used as the middle filter layer, and then an elastic two-component meltblown cloth is used as the upper elastic layer, and a polyester spunbond non-woven fabric with a certain strength is used as the lower support layer. The resulting three-component elastic non-woven fabric, on the one hand, has a higher fluffiness, which is beneficial to increase the dust holding capacity of the three-component elastic non-woven fabric and improve the filtering effect of the three-component elastic non-woven fabric; on the other hand, it has higher elasticity and strength, which increases the pressure required for the three-component elastic non-woven fabric to vibrate during the air supply filtration process, reduces the adverse effects of vibration on the structure of the three-component elastic non-woven fabric itself, and is beneficial to improving the service life of the three-component elastic non-woven fabric.

[0014] At the same time, during the air supply and filtration process of the three-component elastic non-woven fabric, the three-component elastic non-woven fabric of the present application can utilize the rapid rebound performance of the elastic layer to quickly deform, thereby quickly vibrating to make the dust in the three-component elastic non-woven fabric fall off, and does not destroy the structure of the three-component elastic non-woven fabric itself, thereby improving the flushing and backblowing effects of the three-component elastic non-woven fabric and extending the service life of the three-component elastic non-woven fabric.

[0015] Preferably, the two-component meltblown cloth is composed of the following components, calculated by weight percentage:

[0016] Polypropylene masterbatch 40% to 62%;

[0017] Elastomer masterbatch 35% to 55%;

[0018] Maleic anhydride grafted polypropylene copolymer 3% to 5%.

[0019] By adopting the above technical solution, maleic anhydride grafted polypropylene copolymer is blended with polypropylene masterbatch and elastomer masterbatch. Since the maleic anhydride grafted polypropylene copolymer contains strongly polar side groups, it can promote the dispersion of polypropylene masterbatch and elastomer masterbatch, thereby improving the compatibility of polypropylene masterbatch and elastomer masterbatch and improving spinning stability.

[0020] Preferably, the elastomer in the elastomer masterbatch is any one of polyurethane elastomer, polyetherester elastomer, polyamide elastomer and olefin copolymer.

[0021] Preferably, the olefin copolymer is any one of ethylene-vinyl acetate copolymer, polystyrene-polyethylene-polybutylene-polystyrene block copolymer and ethylene-octene copolymer.

[0022] By adopting the above technical solution, the meltblown cloth prepared using the above-mentioned type of elastomer masterbatch as raw material has good elasticity, is not easy to undergo permanent deformation under the action of external force, has strong buffering capacity, and improves the backwashing effect of the three-component elastic non-woven fabric.

[0023] Preferably, the polypropylene meltblown cloth is composed of the following components by weight percentage:

[0024] Polypropylene masterbatch 90%~95.5%;

[0025] Maleic anhydride grafted polypropylene copolymer 0.5% to 6%;

[0026] Electret masterbatch 3% to 4%.

[0027] By adopting the above technical solution, the polarity of the resulting polypropylene meltblown fabric can be increased due to the highly polar side groups contained in the blend of maleic anhydride-grafted polypropylene copolymer, polypropylene masterbatch, and electret masterbatch. Therefore, when the polar polypropylene meltblown fabric is composited with a polar bicomponent meltblown fabric and a polar polyester spunbond nonwoven fabric, the three layers of meltblown fabric exhibit good compatibility, which helps improve the bonding strength between the three layers and enhances the filtration efficiency and strength of the three-component elastic nonwoven fabric.

[0028] Preferably, the polypropylene meltblown cloth is composed of the following components by weight percentage:

[0029] Polypropylene masterbatch 94%~99.5%;

[0030] Maleic anhydride grafted polypropylene copolymer 0.5% to 6%.

[0031] By adopting the above technical solution, a polypropylene meltblown cloth can be prepared by blending polypropylene masterbatch and maleic anhydride grafted polypropylene copolymer. After being compounded with a two-component meltblown cloth and a polyester spunbond non-woven fabric, the final three-component elastic non-woven fabric has high strength, can be used for filtering liquids, and has a high filtration effect.

[0032] Preferably, the weight of the polyester spunbond nonwoven fabric in the upper elastic layer is 50-100 g / m 2 In the middle filter layer, the weight of polypropylene meltblown cloth is 15-60g / m 2 In the lower support layer, the weight of the two-component meltblown cloth is 20-60g / m 2 .

[0033] By adopting the above technical solution, the gram weight of polyester spunbond non-woven fabric, polypropylene meltblown fabric and two-component meltblown fabric can be selected according to the filtration accuracy requirements of the filter. The reusable three-component elastic non-woven fabric finally prepared has good filtration effect and long service life.

[0034] In a second aspect, the present application provides a production process for a reusable three-component elastic nonwoven fabric, which adopts the following technical solution:

[0035] A process for producing a reusable three-component elastic nonwoven fabric comprises the following steps:

[0036] S1: After preparing a polyester spunbond non-woven fabric from a polyester masterbatch by a spunbond process, the fabric is first pleated to form wrinkles, and then heat-set to obtain a pleated polyester spunbond non-woven fabric;

[0037] S2: Mix the components for preparing polypropylene meltblown fabric, prepare the polypropylene meltblown fabric by meltblowing, and directly composite it with the pleated polyester spunbond nonwoven fabric of S1 to obtain a composite nonwoven fabric;

[0038] S3: The components for preparing the two-component meltblown fabric are mixed, and after preparing the two-component meltblown fabric by the meltblowing method, the two-component meltblown fabric is directly compounded with the composite non-woven fabric of S2 to obtain a reusable three-component elastic non-woven fabric.

[0039] By adopting the above technical solution, polyester spunbond nonwovens are produced online, pleated online, and then composited online with polypropylene meltblown fabric. On the one hand, due to the presence of polar groups such as ester, carboxylic acid, and hydroxyl groups in the polyester macromolecular chain, polar groups such as acid anhydride are introduced into the polypropylene meltblown fabric. As a result, the interfacial compatibility between the polyester spunbond nonwoven fabric and the fine filter layer in the polypropylene meltblown fabric is high, enhancing the bonding strength between the polyester spunbond nonwoven fabric and the polypropylene meltblown fabric, and improving the strength of the overall structure of the three-component elastic nonwoven fabric.

[0040] On the other hand, the current preparation process for high and medium efficiency filters is mostly offline compounding followed by folding processing. However, the filtration efficiency of the compounded filter material will decrease during the folding process. This is because the temperature is high during the heat setting process in the folding process, and the meltblown cloth is thin. Under the action of high temperature, the charge stored inside the meltblown cloth will be partially dissipated, resulting in a decrease in filtration efficiency. However, the present application adopts a production process of folding first and then compounding, which reduces or even eliminates the impact of the folding process on the charge dissipation of the polypropylene meltblown cloth, and improves the filtration efficiency of the three-component elastic non-woven fabric; at the same time, online compounding production is conducive to improving production efficiency and reducing costs.

[0041] Preferably, in step S1, the specific steps of the spunbond method are: drying the polyester masterbatch, heating, and extruding to obtain a viscous polymer melt; drawing the viscous polymer melt, dividing it into a web, and then hot-rolling and consolidating it to obtain a polyester spunbond nonwoven fabric;

[0042] During hot rolling, the line pressure is 294-1177 N / m and the temperature is 250-300°C.

[0043] By adopting the above technical solution, in the hot rolling process step, under the above-mentioned linear pressure and temperature conditions, the use of a central convex roller combined with an axis crossing process can compensate for the bending deformation of the roller caused by the working pressure, so that the surface of the polyester spunbond non-woven fabric is subjected to uniform pressure, thereby improving the uniformity of various structural properties of the polyester spunbond non-woven fabric after hot rolling.

[0044] Preferably, in step S1, during the folding process, the fold height is 25 mm to 40 mm, and the fold distance is 4.0 mm to 5.2 mm; during the heat setting process, the heat setting temperature is 80° C. to 100° C., and the time is 1 min to 10 min.

[0045] By adopting the above technical solution, the polyester spunbond nonwoven fabric is folded in a "V" shape, which can increase the filtration area of ​​the folded polyester spunbond nonwoven fabric and reduce its filtration speed and filtration resistance.

[0046] In summary, this application has the following beneficial effects:

[0047] 1. Since the two-component meltblown fabric has high elasticity and the polyester spunbond non-woven fabric has high strength, the three-component elastic non-woven fabric composed of polypropylene meltblown fabric, two-component meltblown fabric and polyester spunbond non-woven fabric has good resilience and high structural strength. It deforms and vibrates rapidly during the air supply and filtration process, which causes the dust in the three-component elastic non-woven fabric to fall off without affecting the structure of the three-component elastic non-woven fabric, thereby improving the backwashing effect of the three-component elastic non-woven fabric and extending the service life of the three-component elastic non-woven fabric.

[0048] 2. The maleic anhydride grafted polypropylene copolymer contains highly polar side groups, which can promote the dispersion of polypropylene masterbatch and elastomer masterbatch, enhance the compatibility of polypropylene masterbatch and elastomer masterbatch. The resulting two-component meltblown fabric has good elasticity, is not prone to permanent deformation under external force, and has strong buffering capacity;

[0049] 3. The three-component elastic non-woven fabric of the present application adopts a production process of first pleating and then compounding, which reduces the impact of the pleating process on the charge dissipation of the polypropylene meltblown fabric and improves the filtration efficiency of the three-component elastic non-woven fabric; at the same time, online compound production is conducive to improving production efficiency and reducing costs. DETAILED DESCRIPTION

[0050] The present application is further described in detail below with reference to the embodiments.

[0051] Performance testing

[0052] The reusable three-component elastic non-woven fabric obtained in the embodiment of the present application and the composite non-woven fabric obtained in the comparative example were tested for breaking strength and breaking elongation, air filtration efficiency, initial resistance and dust holding capacity, and liquid filtration ratio β x , filtration efficiency E (> x) and dirt holding capacity test, the test method is as follows:

[0053] Breaking strength and breaking elongation test: refer to GB / T 24218.3-2010.

[0054] Filtration efficiency, initial resistance, and dust holding capacity testing: refer to GB / T 14295-2019 and GB / T 13554-2020.

[0055] Filtration ratio β x , filtration efficiency E(>x) and dirt holding capacity test: refer to GB / T 18853-2015.

[0056] Example

[0057] Example 1

[0058] A reusable three-component elastic nonwoven fabric, the components of the upper elastic layer, the middle filter layer and the lower support layer and their corresponding weights (kg) are shown in the following table.

[0059]

[0060] In the embodiment of the present application, the upper elastic layer contains polypropylene masterbatch with a density of 0.9 g / cm 3 , the melt index is 1200g / 10min.

[0061] The elastomer masterbatch is a polyurethane elastomer with a melt index of 25g / 10min.

[0062] Maleic anhydride grafted polypropylene copolymer, melting point 158 ​​° C, density 0.934 g / cm 3 , needle penetration is less than 1dmm, hot melt viscosity at 125℃ is 300mmcps, and acid value is 45mg KOH / g.

[0063] In the middle filter layer, the density of polypropylene masterbatch is 0.9g / cm 3 , the melt index is 1200g / 10min.

[0064] The melting point of maleic anhydride grafted polypropylene copolymer is 158°C and the density is 0.934 g / cm 3 , needle penetration is less than 1dmm, hot melt viscosity at 125℃ is 300mmcps, and acid value is 45mg KOH / g.

[0065] The brand of electret masterbatch is CONCHARGE 1593, which was purchased from Kafrit Group.

[0066] The lower supporting layer contains polyester masterbatch with a melting point of 255° C., an intrinsic viscosity of 0.65, a terminal carboxyl content of less than 30 mol / t, and a color b value of 3.

[0067] The production process of the above-mentioned reusable three-component elastic nonwoven fabric includes the following process steps:

[0068] S1: After preparing a polyester spunbond nonwoven fabric from a polyester masterbatch by a spunbond process, the fabric is first pleated to form V-shaped pleats, and then heat-set to obtain a pleated polyester spunbond nonwoven fabric;

[0069] The specific steps of preparing polyester spunbond nonwoven fabrics by the above spunbond method are as follows:

[0070] Dry the polyester masterbatch to a moisture content of less than or equal to 20×10 -6 After that, it is heated and extruded to obtain a viscous polymer melt; the viscous polymer melt is first spun, and then stretched by a wide-narrow gap positive pressure stretching process, the filaments are divided into a web, and finally hot-rolled by a middle convex roller and axis cross process to obtain a polyester spunbond non-woven fabric.

[0071] During stretching, the stretching speed is 5000 m / min to 6500 m / min (5000 m / min in the embodiment of the present application), and the stretching air flow temperature is 20° C. to 30° C.

[0072] During hot rolling, the roll temperature is 260°C, the roll line pressure is 368N / m, and the axis crossing amount is 10mm.

[0073] When the polyester spunbond nonwoven fabric is pleated, the pleat height is 25 mm and the pleat distance is 4.0 mm.

[0074] When the polyester spunbond nonwoven fabric is subjected to heat setting treatment, the heat setting temperature is 80° C. and the time is 8 minutes.

[0075] S2: Polypropylene masterbatch, maleic anhydride grafted polypropylene copolymer and electret masterbatch are mixed to prepare polypropylene meltblown fabric by meltblowing method, which is directly compounded with the pleated polyester spunbond non-woven fabric of S1 to obtain a composite non-woven fabric. The specific steps of preparing polypropylene meltblown fabric by the meltblowing method are as follows:

[0076] The polypropylene masterbatch, maleic anhydride grafted polypropylene copolymer and electret masterbatch are mixed, dried, heated and extruded to obtain a viscous polymer melt; the viscous polymer melt is first spun, then drawn, water-electreted and stacked into a web to obtain a polypropylene meltblown cloth.

[0077] S3: Polypropylene masterbatch, elastomer masterbatch and maleic anhydride grafted polypropylene copolymer are mixed, and a two-component meltblown cloth is prepared by meltblowing. The two-component meltblown cloth is then directly compounded with the composite non-woven fabric of S2 to obtain a reusable three-component elastic non-woven fabric.

[0078] The specific steps of preparing the two-component meltblown cloth by the above meltblowing method are as follows:

[0079] The polypropylene masterbatch, elastomer masterbatch and maleic anhydride grafted polypropylene copolymer are mixed, dried, heated and extruded to obtain a viscous polymer melt; the viscous polymer melt is first spun, then drawn and stacked into a web to obtain a two-component meltblown cloth.

[0080] In the embodiment of the present application, the weight of the polyester spunbond nonwoven fabric in the upper elastic layer is 60g / m 2 ;

[0081] In the middle filter layer, the weight of polypropylene meltblown cloth is 30g / m 2 ;

[0082] In the lower support layer, the weight of the two-component meltblown cloth is 30g / m 2 .

[0083] Examples 2-3

[0084] A reusable three-component elastic nonwoven fabric is different from Example 1 in that the components of the upper elastic layer, the middle filter layer and the lower support layer and their corresponding weights (kg) are shown in the following table.

[0085]

[0086] The reusable three-component elastic non-woven fabrics obtained in Examples 1 to 3 of the present application were tested for breaking strength and breaking elongation, and the air filtration efficiency, initial resistance and dust holding capacity. The test results are shown in the following table.

[0087]

[0088] By analyzing the data in the above table, it can be seen that the reusable three-component elastic non-woven fabrics obtained in Examples 1 to 3 have a longitudinal breaking strength of up to 132.1 to 143.9 N / 5cm and a transverse breaking strength of up to 1135.3 to 144.7 N / 5cm; a longitudinal elongation at break of up to 51 to 75%, and a transverse elongation at break of up to 53 to 77%; an air filtration efficiency of up to 98.73 to 99.90%, an initial resistance as low as 41 to 44 Pa, and a dust holding capacity of up to 460 to 514 g. This shows that the reusable three-component elastic non-woven fabrics obtained in Examples 1 to 3 of the present application have high filtration effect, large dust holding capacity, high strength, high elasticity, good backwashing effect, and long service life.

[0089] Further analysis of the above table shows that, among Examples 1 to 3, the breaking strength and elongation at break of Example 1 are lower than those of Examples 2 and 3, but the air filtration efficiency is higher than that of Examples 2 and 3. The reason for this may be that, in Example 1, the content of the elastomer masterbatch in the upper elastic layer is lower than that of Examples 2 and 3, so the elasticity and strength of Example 1 are reduced; however, the content of the polypropylene masterbatch in the middle filter layer is higher than that of Examples 2 and 3, so the air filtration efficiency of Example 1 is better.

[0090] Example 4

[0091] A reusable three-component elastic non-woven fabric is different from Example 1 in that the elastomer masterbatch in the upper elastic layer is ethylene-vinyl acetate copolymer, the vinyl acetate content in the ethylene-vinyl acetate copolymer is 28%, and the melt flow rate is 400g / 10min.

[0092] Example 5

[0093] A reusable three-component elastic nonwoven fabric, which differs from Example 1 in that the elastomer masterbatch in the upper elastic layer is a polystyrene-polyethylene-polybutylene-polystyrene block copolymer and a polystyrene-polyethylene-polybutylene-polystyrene block copolymer with a density of 0.9 g / cm 3 , the melt flow rate is 14g / 10min, the polystyrene content is 17% to 21%, the antioxidant content is 0.06% to 0.14%, the ash content is 0.02% to 0.12%, and the elongation at break is greater than 600%.

[0094] The reusable three-component elastic non-woven fabrics obtained in Examples 4 to 5 of the present application were tested for breaking strength and breaking elongation, and the air filtration efficiency, initial resistance and dust holding capacity. The test results are shown in the following table.

[0095]

[0096] By analyzing the data in the above table, it can be seen that the reusable three-component elastic non-woven fabrics obtained in Examples 1, 4, and 5 have a longitudinal breaking strength of up to 125.3-132.1 N / 5cm and a transverse breaking strength of up to 121.5-135.3 N / 5cm; a longitudinal elongation at break of up to 37-51%, and a transverse elongation at break of up to 35-53%; an air filtration efficiency of up to 99.90-99.91%, an initial resistance as low as 41-42 Pa, and a dust holding capacity of up to 435-460 g. This shows that in the total raw materials for preparing the reusable three-component elastic non-woven fabric of the present application, the elastic masterbatch in the two-component meltblown fabric is a polyurethane elastomer or an olefin copolymer, and the reusable three-component elastic non-woven fabric finally obtained has good strength, elasticity, and filtration efficiency.

[0097] In the preparation of a two-component meltblown fabric, when the elastic masterbatch is a polyetherester elastomer and a polyamide elastomer, the resulting reusable three-component elastic nonwoven fabric exhibits similar breaking strength, elongation at break, air filtration efficiency, initial resistance, and dust holding capacity to those of Example 1. Therefore, the examples of this application only briefly illustrate elastic masterbatches using polyurethane elastomers or olefin copolymers as examples, but this does not affect the applicability of other types of elastomer masterbatches in this application.

[0098] Example 6

[0099] A reusable three-component elastic non-woven fabric is different from Example 1 in that, in the production process of the reusable three-component elastic non-woven fabric, in process step S1, the roller temperature during hot rolling is 263°C, the roller line pressure is 405N / m, and the axis intersection amount is 13mm.

[0100] Example 7

[0101] A reusable three-component elastic non-woven fabric is different from Example 1 in that, in the production process of the reusable three-component elastic non-woven fabric, in process step S1, the roller temperature during hot rolling is 265°C, the roller line pressure is 475N / m, and the axis intersection amount is 16mm.

[0102] The reusable three-component elastic non-woven fabrics obtained in Examples 6 to 7 of the present application were tested for breaking strength and breaking elongation. The test results are shown in the following table.

[0103]

[0104] Example 8

[0105] A reusable three-component elastic non-woven fabric is different from Example 1 in that in the production process of the reusable three-component elastic non-woven fabric, in process step S1, during the folding treatment, the fold height is 33 mm, the fold distance is 4.5 mm, the heat setting temperature is 85°C, and the time is 6 minutes.

[0106] Example 9

[0107] A reusable three-component elastic non-woven fabric is different from Example 1 in that, in the production process of the reusable three-component elastic non-woven fabric, in process step S1, the fold height is 38 mm, the fold distance is 4.8 mm, the heat setting temperature is 90°C, and the time is 5 minutes.

[0108] Example 10

[0109] A reusable three-component elastic non-woven fabric is different from Example 1 in that in the production process of the reusable three-component elastic non-woven fabric, in process step S1, the fold height is 40 mm, the fold distance is 5.2 mm, the heat setting temperature is 100°C, and the time is 10 minutes.

[0110] Example 11

[0111] A reusable three-component elastic non-woven fabric is different from Example 1 in that, in the production process of the reusable three-component elastic non-woven fabric, in process step S1, the fold height is 40 mm, the fold distance is 5.2 mm, the heat setting temperature is 100°C, and the time is 1 min.

[0112] The reusable three-component elastic non-woven fabrics obtained in Examples 8 to 11 of the present application were tested for breaking strength and breaking elongation, and the air filtration efficiency, initial resistance and dust holding capacity. The test results are shown in the following table.

[0113]

[0114] By analyzing the data in the above table, it can be seen that the breaking strength and elongation at break of the reusable three-component elastic non-woven fabrics obtained in Examples 1, 8, 9, 10 and 11 do not change much, but the filtration efficiency, initial resistance and dust holding capacity fluctuate significantly. This is because the filtration area in the filter changes with the change of fold height and fold distance. However, if the heat setting time is not sufficient, the "fold" cannot be fixed, the filtration area decreases, and the filtration efficiency, initial resistance and dust holding capacity all decrease.

[0115] Example 12

[0116] A reusable three-component elastic nonwoven fabric, which is different from Example 1 in that the polyester spunbond nonwoven fabric in the upper elastic layer has a gram weight of 60 g / m2 In the middle filter layer, the weight of polypropylene meltblown cloth is 20g / m 2 ; In the lower support layer, the weight of the two-component meltblown cloth is 40g / m 2 .

[0117] Example 13

[0118] A reusable three-component elastic nonwoven fabric, which is different from Example 1 in that the polyester spunbond nonwoven fabric in the upper elastic layer has a gram weight of 50 g / m 2 In the middle filter layer, the weight of polypropylene meltblown cloth is 35g / m 2 In the lower support layer, the weight of the two-component meltblown cloth is 35g / m 2 .

[0119] The reusable three-component elastic non-woven fabrics obtained in Examples 12 to 13 of the present application were tested for breaking strength and breaking elongation, and the air filtration efficiency, initial resistance and dust holding capacity. The test results are shown in the following table.

[0120]

[0121] By analyzing the data in the above table, it can be seen from the comparison of Example 1 and Example 12 that with the decrease in the gram weight of the polypropylene filter cloth, the filtration efficiency of the three-component elastic non-woven fabric decreases significantly, but with the increase in the gram weight of the elastic layer two-component melt-blown cloth, the elongation at break of the material increases significantly, and it can be used for medium-efficiency filters to improve the backflushing and cleaning capabilities of the material, thereby increasing the service life of the material.

[0122] By comparing Example 1 and Example 13, it can be seen that as the grammage of the polyester spunbond non-woven fabric decreases, the breaking strength of the three-component elastic non-woven fabric decreases. However, due to the increase in the grammage of the filter layer and the elastic layer, the breaking elongation, filtration efficiency and dust holding capacity of the material are also significantly improved. It can be used for medium-efficiency, high-efficiency and above filters to improve the single-time service life of the material and the backflushing cleaning ability.

[0123] Examples 14 to 16

[0124] A reusable three-component elastic nonwoven fabric, the components of the upper elastic layer, the middle filter layer and the lower support layer and their corresponding weights (kg) are shown in the following table.

[0125]

[0126] The production process of the reusable three-component elastic nonwoven fabric includes the following process steps:

[0127] S1: After preparing a polyester spunbond non-woven fabric from a polyester masterbatch by a spunbond process, the fabric is first pleated to form wrinkles, and then heat-set to obtain a pleated polyester spunbond non-woven fabric;

[0128] The specific steps of preparing polyester spunbond nonwoven fabrics by the above spunbond method are as follows:

[0129] Dry the polyester masterbatch to a moisture content of less than or equal to 20×10 -6 After that, it is heated and extruded to obtain a viscous polymer melt; the viscous polymer melt is first spun, and then stretched by a wide-narrow gap positive pressure stretching process, the filaments are divided into a web, and finally hot-rolled by a middle convex roller and axis cross process to obtain a polyester spunbond non-woven fabric.

[0130] During stretching, the stretching speed is 5000 m / min-6500 m / min (5000 m / min in the embodiment of the present application), and the stretching air flow temperature is 20°C-30°C.

[0131] During hot rolling, the roll temperature is 260°C, the roll line pressure is 368N / m, and the axis crossing amount is 10mm.

[0132] When the polyester spunbond nonwoven fabric is pleated, the pleat height is 25 mm and the pleat distance is 4.0 mm.

[0133] When the polyester spunbond nonwoven fabric is subjected to heat setting treatment, the heat setting temperature is 80° C. and the time is 8 minutes.

[0134] S2: Polypropylene masterbatch and maleic anhydride grafted polypropylene copolymer are mixed to prepare a polypropylene meltblown fabric by meltblowing, which is then directly composited with the pleated polyester spunbond nonwoven fabric of S1 to obtain a composite nonwoven fabric;

[0135] The specific steps of preparing polypropylene meltblown cloth by the meltblowing method are as follows:

[0136] The polypropylene masterbatch and the maleic anhydride grafted polypropylene copolymer are mixed, dried, heated, and extruded to obtain a viscous polymer melt; the viscous polymer melt is first spun, then drawn, and stacked into a web to obtain a polypropylene meltblown cloth.

[0137] S3: Polypropylene masterbatch, elastomer masterbatch and maleic anhydride grafted polypropylene copolymer are mixed, and a two-component meltblown cloth is prepared by meltblowing. The two-component meltblown cloth is then directly compounded with the composite non-woven fabric of S2 to obtain a reusable three-component elastic non-woven fabric.

[0138] The specific steps of preparing the two-component meltblown cloth by the above meltblowing method are as follows:

[0139] The polypropylene masterbatch, elastomer masterbatch and maleic anhydride grafted polypropylene copolymer are mixed, dried, heated and extruded to obtain a viscous polymer melt; the viscous polymer melt is first spun, then drawn and stacked into a web to obtain a two-component meltblown cloth.

[0140] The reusable three-component elastic non-woven fabrics obtained in Examples 14 to 16 of the present application were tested for liquid filtration ratio βx, filtration efficiency E(>x) and dirt holding capacity. The test results are shown in the following table.

[0141]

[0142] Analysis of the data in the table above indicates that the reusable three-component elastic nonwoven fabrics obtained in Examples 14, 15, and 16 achieved a liquid filtration efficiency of up to 99.5% and a dirt-holding capacity of 532-583 g. This demonstrates that the reusable three-component elastic nonwoven fabrics obtained in Examples 16, 17, and 18 of the present application have high liquid filtration efficiency, large dirt-holding capacity, and long service life.

[0143] Example 17

[0144] A reusable three-component elastic non-woven fabric, which differs from Example 14 in that the elastomer masterbatch in the upper elastic layer is ethylene-vinyl acetate copolymer, the vinyl acetate content in the ethylene-vinyl acetate copolymer is 28%, and the melt flow rate is 400g / 10min.

[0145] Example 18

[0146] A reusable three-component elastic nonwoven fabric, which differs from Example 14 in that the elastomer masterbatch in the upper elastic layer is a polystyrene-polyethylene-polybutylene-polystyrene block copolymer and a polystyrene-polyethylene-polybutylene-polystyrene block copolymer with a density of 0.9 g / cm 3 , the melt flow rate is 14g / 10min, the polystyrene content is 17% to 21%, the antioxidant content is 0.06% to 0.14%, the ash content is 0.02% to 0.12%, and the elongation at break is greater than 600%.

[0147] The reusable three-component elastic non-woven fabrics obtained in Examples 17 to 18 of the present application were tested for liquid filtration ratio βx, filtration efficiency E(>x) and dirt holding capacity. The test results are shown in the following table.

[0148]

[0149] Analysis of the data in the table above indicates that the reusable three-component elastic nonwoven fabrics obtained in Examples 14, 17, and 18 achieved a liquid filtration efficiency of up to 99.5% and a dirt holding capacity of 505-532 g. This demonstrates that, in the total raw materials used to prepare the reusable three-component elastic nonwoven fabrics of this application, the elastic masterbatch in the two-component meltblown fabric is a polyurethane elastomer or an olefin copolymer. The resulting reusable three-component elastic nonwoven fabrics all exhibit excellent liquid filtration efficiency and dirt holding capacity, resulting in a long service life.

[0150] Example 19

[0151] A reusable three-component elastic non-woven fabric is different from Example 14 in that in the production process of the reusable three-component elastic non-woven fabric, in process step S1, during the folding treatment, the fold height is 33 mm, the fold distance is 4.5 mm, the heat setting temperature is 85°C, and the time is 6 minutes.

[0152] Example 20

[0153] A reusable three-component elastic non-woven fabric is different from Example 14 in that in the production process of the reusable three-component elastic non-woven fabric, in process step S1, during the folding treatment, the fold height is 38 mm, the fold distance is 4.8 mm, the heat setting temperature is 90°C, and the time is 5 minutes.

[0154] Example 21

[0155] A reusable three-component elastic non-woven fabric is different from Example 14 in that in the production process of the reusable three-component elastic non-woven fabric, in process step S1, during the folding treatment, the fold height is 40 mm, the fold distance is 5.2 mm, the heat setting temperature is 100°C, and the time is 10 minutes.

[0156] Example 22

[0157] A reusable three-component elastic non-woven fabric is different from Example 14 in that in the production process of the reusable three-component elastic non-woven fabric, in process step S1, during the folding treatment, the fold height is 40 mm, the fold distance is 5.2 mm, the heat setting temperature is 100°C, and the time is 1 min.

[0158] The reusable three-component elastic non-woven fabrics obtained in Examples 19 to 22 of the present application were tested for liquid filtration ratio β5, filtration efficiency E (>5) and dirt holding capacity. The test results are shown in the following table.

[0159]

[0160] Analysis of the data in the table above indicates that the reusable three-component elastic nonwoven fabrics obtained in Examples 19 to 22 of the present application have a liquid filtration efficiency of up to 99.5% and a dirt holding capacity of up to 521-604 g. This indicates that in the production process of the reusable three-component elastic nonwoven fabric of the present application, during the pleating process in step S1, the pleats are 25 mm to 40 mm in height and 4.0 mm to 5.2 mm in distance; and during the heat setting process, the heat setting temperature is 80°C to 100°C for 1 min to 10 min. This pleating process can increase the filtration area of ​​the three-layer elastic nonwoven fabric, reduce its filtration speed and filtration resistance, and improve its filtration efficiency and dirt holding capacity.

[0161] Comparative Example

[0162] Comparative Example 1

[0163] A composite non-woven fabric, commercially available, with a total weight of 120g / m 2 , can be used to filter the air.

[0164] Comparative Example 2

[0165] A composite nonwoven fabric, which differs from Example 1 in that the production process of the composite nonwoven fabric includes the following process steps:

[0166] S1: preparing polyester spunbond nonwoven fabric by spunbonding polyester masterbatch;

[0167] The specific steps of preparing polyester spunbond nonwoven fabrics by the above spunbond method are as follows:

[0168] Dry the polyester masterbatch to a moisture content of less than or equal to 20×10 -6 After that, it is heated and extruded to obtain a viscous polymer melt; the viscous polymer melt is first spun, and then stretched by a wide-narrow gap positive pressure stretching process, the filaments are divided into a web, and finally hot-rolled by a middle convex roller and axis cross process to obtain a polyester spunbond non-woven fabric.

[0169] During stretching, the stretching speed is 5000 m / min-6500 m / min (5000 m / min in the comparative example of the present application), and the stretching air flow temperature is 20°C-30°C.

[0170] During hot rolling, the roll temperature is 260°C, the roll line pressure is 368N / m, and the axis crossing amount is 10mm.

[0171] S2: Mixing polypropylene masterbatch, maleic anhydride grafted polypropylene copolymer and electret masterbatch to prepare polypropylene meltblown cloth by meltblowing method;

[0172] The specific steps of preparing polypropylene meltblown cloth by the meltblowing method are as follows:

[0173] The polypropylene masterbatch, maleic anhydride grafted polypropylene copolymer and electret masterbatch are mixed, dried, heated and extruded to obtain a viscous polymer melt; the viscous polymer melt is first spun, then drawn, water-electreted and stacked into a web to obtain a polypropylene meltblown cloth.

[0174] S3: Polypropylene masterbatch, elastomer masterbatch and maleic anhydride grafted polypropylene copolymer are mixed, and a two-component meltblown cloth is prepared by a meltblowing method, which is then directly compounded with the polypropylene meltblown cloth of S2 to obtain non-woven fabric I.

[0175] The specific steps of preparing the two-component meltblown cloth by the above meltblowing method are as follows:

[0176] The polypropylene masterbatch, elastomer masterbatch and maleic anhydride grafted polypropylene copolymer are mixed, dried, heated and extruded to obtain a viscous polymer melt; the viscous polymer melt is first spun, then drawn and stacked into a web to obtain a two-component meltblown cloth.

[0177] S4: spraying hot melt adhesive onto the polyester spunbond nonwoven fabric, and then, under a certain pressure, compounding the polyester spunbond nonwoven fabric sprayed with the hot melt adhesive with the nonwoven fabric I to form a nonwoven fabric II;

[0178] The temperature of the hot melt adhesive is 155℃±2℃;

[0179] The compounding pressure is 0.5 MPa and the speed is 40 m / min;

[0180] The tension of polyester spunbond nonwoven fabric is 35N;

[0181] The tension of the nonwoven fabric I is 1.5N.

[0182] S5: first pleating the non-woven fabric II to form wrinkles, and then performing heat setting treatment to obtain a pleated composite non-woven fabric;

[0183] When the non-woven fabric II is pleated, the pleat height is 25 mm and the pleat distance is 4.0 mm.

[0184] When the non-woven fabric II is subjected to heat setting treatment, the heat setting temperature is 80° C. and the time is 8 minutes.

[0185] The composite non-woven fabrics obtained in Comparative Examples 1 and 2 of the present application were tested for breaking strength and breaking elongation, and the air filtration efficiency, initial resistance and dust holding capacity were tested. The test results are shown in the following table.

[0186]

[0187] By analyzing the data in the above table, it can be seen that compared with the commercially available product of Comparative Example 1, the breaking strength of Example 1 is slightly improved, the elongation at break is significantly improved, and the dust holding capacity is slightly increased.

[0188] Compared to the composite nonwoven fabric prepared in Comparative Example 2 using a lamination-then-pleating process, Example 1 exhibited slightly lower breaking strength, significantly increased elongation at break, and significantly reduced initial resistance. Further analysis revealed that while the off-line chemical bonding and subsequent pleating process improves the bonding strength between the layers of the composite nonwoven fabric, the presence of the adhesive blocks the pores of the nonwoven fabric, leading to increased filtration efficiency and resistance and reduced dust holding capacity.

[0189] The composite non-woven fabrics obtained in Example 1 and Comparative Examples 1-2 of the present application were used as filter elements and installed in the same filter. The air dust holding capacity, single use time, backflush effect, second use time, and third use time of the filter were tested. The testing method is as follows:

[0190] Dust holding capacity: Refer to GB / T 14295-2019, GB / T 13554-2020 for testing.

[0191] Single-use time, second-use time, and third-use time: GB / T 14295-2019, GB / T 13554-2020 testing.

[0192] Backflush effect: The backflush test method is:

[0193] 1. Remove the filter element from the filter;

[0194] 2. Install the filter element into the compressed air backflush device and use clean compressed air to clean the filter element. The backflush pressure is 1.2 times the working pressure. Each backflush time is 3 seconds. Repeat the operation 5 times.

[0195] 3. Remove the filter element from the compressed air backwash device and place the filter element in clean liquid for backwashing. For backwashing, soak the filter element in a clean bucket for 15 minutes, then backwash it with clean liquid for 3 minutes, backwash twice, and then rinse the filter element surface with deionized water until the clean liquid is neutral, and measure the conductivity. The cleaning liquid is 0.1% hydrochloric acid solution.

[0196] 4. Use clean compressed air with a pressure of 0.4Mpa to blow dry or dry naturally in a cool and dark place.

[0197] 5. Cleaning effect: The filter element returns to its original color;

[0198] 6. After drying, the filter element must be leak-tested according to GB / T 14295-2019 and GB / T 13554-2020 before use to ensure that there is no leakage in the filter element.

[0199] The above test results are shown in the following table.

[0200]

[0201] Analysis of the data in the table above shows that, compared to Comparative Examples 1 and 2, Example 1 can slightly increase the filter's single-use time and significantly increase the filter's usable time after cleaning, thereby increasing the material's service life. Further analysis shows that the use of an adhesive for lamination in Comparative Example 2 reduced the porosity and elasticity of the composite nonwoven fabric, thereby reducing the composite nonwoven fabric's dust holding capacity and backflushing capacity, and thus reducing the composite nonwoven fabric's reusability.

[0202] Comparative Example 3

[0203] A composite non-woven fabric, commercially available, with a total weight of 120g / m 2 , which is equivalent to filtering liquid.

[0204] Comparative Example 4

[0205] A composite non-woven fabric, which is similar to Example 14 in that a production process of the composite non-woven fabric comprises the following process steps: S1: preparing a polyester spunbond non-woven fabric by a spunbond method using a polyester masterbatch;

[0206] The specific steps of preparing polyester spunbond nonwoven fabrics by the above spunbond method are as follows:

[0207] Dry the polyester masterbatch to a moisture content of less than or equal to 20×10 -6 After that, it is heated and extruded to obtain a viscous polymer melt; the viscous polymer melt is first spun, and then stretched by a wide-narrow gap positive pressure stretching process, the filaments are divided into a web, and finally hot-rolled by a middle convex roller and axis cross process to obtain a polyester spunbond non-woven fabric.

[0208] During stretching, the stretching speed is 5000 m / min-6500 m / min (5000 m / min in the comparative example of the present application), and the stretching air flow temperature is 20°C-30°C.

[0209] During hot rolling, the roll temperature is 260°C, the roll line pressure is 368N / m, and the axis crossing amount is 10mm.

[0210] S2: Mixing polypropylene masterbatch and maleic anhydride grafted polypropylene copolymer to prepare polypropylene meltblown cloth by meltblowing;

[0211] The specific steps of preparing polypropylene meltblown cloth by the meltblowing method are as follows:

[0212] The polypropylene masterbatch and the maleic anhydride grafted polypropylene copolymer are mixed, dried, heated, and extruded to obtain a viscous polymer melt; the viscous polymer melt is first spun, then drawn, and stacked into a web to obtain a polypropylene meltblown cloth.

[0213] S3: Polypropylene masterbatch, elastomer masterbatch and maleic anhydride grafted polypropylene copolymer are mixed, and a two-component meltblown cloth is prepared by a meltblowing method, which is then directly compounded with the polypropylene meltblown cloth of S2 to obtain non-woven fabric I.

[0214] The specific steps of preparing the two-component meltblown cloth by the above meltblowing method are as follows:

[0215] The polypropylene masterbatch, elastomer masterbatch and maleic anhydride grafted polypropylene copolymer are mixed, dried, heated and extruded to obtain a viscous polymer melt; the viscous polymer melt is first spun, then drawn and stacked into a web to obtain a two-component meltblown cloth.

[0216] S4: spraying hot melt adhesive onto the polyester spunbond nonwoven fabric, and then, under a certain pressure, compounding the polyester spunbond nonwoven fabric sprayed with the hot melt adhesive with the nonwoven fabric I to form a nonwoven fabric II;

[0217] The temperature of the hot melt adhesive is 155℃±2℃;

[0218] The compounding pressure is 0.5 MPa and the speed is 40 m / min;

[0219] The tension of polyester spunbond nonwoven fabric is 35N;

[0220] The tension of the nonwoven fabric I is 1.5N.

[0221] S5: first pleating the non-woven fabric II to form wrinkles, and then performing heat setting treatment to obtain a pleated composite non-woven fabric;

[0222] When the non-woven fabric II is pleated, the pleat height is 25 mm and the pleat distance is 4.0 mm.

[0223] When the non-woven fabric II is subjected to heat setting treatment, the heat setting temperature is 80° C. and the time is 8 minutes.

[0224] The composite non-woven fabric obtained in ratios 2 to 3 of Example 14 of the present application was used as a filter element and installed in the same filter. The liquid dirt holding capacity, single use time, backwash effect, second use time and third use time of the filter were tested. The testing method is as follows:

[0225] Pollution holding capacity: Refer to GB / T 18853-2015 for testing.

[0226] Single-use time, second-use time, and third-use time: tested in accordance with GB / T 18853-2015 and GB / T 14295-2008.

[0227] Backwash effect: The backwash test method is:

[0228] 1. Remove the filter element from the filter;

[0229] 2. Use clean compressed air to clean the impurities on the surface of the filter element. The cleaning pressure is 1.5 times the working pressure and the cleaning time is 5 seconds. Repeat the operation 6 times.

[0230] 3. Soak the filter element in a clean bucket filled with 0.1% hydrochloric acid solution for 30 minutes, backwash with 0.1% hydrochloric acid for 5 minutes, backwash twice, then rinse the filter element surface with deionized water until the clean liquid is neutral, and measure the conductivity;

[0231] 4. Use clean compressed air with a pressure of 0.4MPa to blow dry or dry naturally in a cool and dark place.

[0232] 5. Cleaning effect: The filter element returns to its original color;

[0233] 6. Before using the dried filter element, it is necessary to conduct a structural integrity test according to GB / T 14041.1-2007 to ensure that the filter element can be used normally.

[0234] The above test results are shown in the following table.

[0235]

[0236] Analysis of the data in the table above shows that, compared to Comparative Examples 1 and 2, Example 1 slightly increases the filter's single-use time and significantly increases the filter's usable time after cleaning, thereby extending the material's service life. Further analysis shows that the use of an adhesive for lamination in Comparative Example 4 reduces the porosity and elasticity of the composite nonwoven fabric, thereby reducing the composite nonwoven fabric's dirt-holding capacity and recoil capacity, and diminishing its multiple-use effectiveness.

[0237] This specific embodiment is merely an explanation of the present application and is not a limitation of the present application. After reading this specification, those skilled in the art may make non-creative modifications to the present embodiment as needed, but as long as they are within the scope of the claims of the present application, they are protected by the patent law.

Claims

1. A reusable three-component elastic nonwoven fabric, characterized in that: It includes an upper elastic layer, a middle filter layer and a lower support layer; The upper elastic layer is a two-component meltblown cloth; The middle filter layer is a polypropylene melt-blown cloth; The lower support layer is a polyester spunbond nonwoven fabric; The two-component melt-blown cloth is prepared by melt-blowing from components including polypropylene masterbatch, elastomer masterbatch and maleic anhydride grafted polypropylene copolymer; The two-component meltblown cloth is composed of the following components by weight percentage: Polypropylene masterbatch 40% to 62%; Elastomer masterbatch 35% to 55%; Maleic anhydride grafted polypropylene copolymer 3% to 5%; The elastomer in the elastomer masterbatch is any one of polyurethane elastomer, polyetherester elastomer, polyamide elastomer and olefin copolymer; The production process of the reusable three-component elastic non-woven fabric comprises the following steps: S1: preparing a polyester spunbond nonwoven fabric by a spunbonding process, first pleating the fabric to form wrinkles, and then performing a heat setting process to obtain a pleated polyester spunbond nonwoven fabric; S2: Mix the components for preparing polypropylene meltblown fabric, prepare the polypropylene meltblown fabric by meltblowing, and directly composite it with the pleated polyester spunbond nonwoven fabric of S1 to obtain a composite nonwoven fabric; S3: The components for preparing the two-component meltblown fabric are mixed, and after preparing the two-component meltblown fabric by the meltblowing method, the two-component meltblown fabric is directly compounded with the composite non-woven fabric of S2 to obtain a reusable three-component elastic non-woven fabric.

2. The reusable three-component elastic nonwoven fabric according to claim 1, characterized in that: The olefin copolymer is any one of ethylene-vinyl acetate copolymer, polystyrene-polyethylene-polybutylene-polystyrene block copolymer and ethylene-octene copolymer.

3. The reusable three-component elastic nonwoven fabric according to claim 1, characterized in that: The polypropylene meltblown cloth is composed of the following components by weight: Polypropylene masterbatch 90%~95.5%; Maleic anhydride grafted polypropylene copolymer 0.5% to 6%; Electret masterbatch 3%~4%.

4. The reusable three-component elastic nonwoven fabric according to claim 1, characterized in that: The polypropylene meltblown cloth is composed of the following components by weight: Polypropylene masterbatch 94%~99.5%; Maleic anhydride grafted polypropylene copolymer 0.5%~6%.

5. The reusable three-component elastic nonwoven fabric according to claim 1, characterized in that: In the upper elastic layer, the polyester spunbond non-woven fabric has a gram weight of 50-100 g / m²; in the middle filter layer, the polypropylene meltblown fabric has a gram weight of 15-60 g / m²; and in the lower support layer, the two-component meltblown fabric has a gram weight of 20-60 g / m².

6. The production process of the reusable three-component elastic nonwoven fabric according to any one of claims 1 to 5, characterized in that: The following steps are involved: S1: preparing a polyester spunbond nonwoven fabric by a spunbonding process, first pleating the fabric to form wrinkles, and then performing a heat setting process to obtain a pleated polyester spunbond nonwoven fabric; S2: Mix the components for preparing polypropylene meltblown fabric, prepare the polypropylene meltblown fabric by meltblowing, and directly composite it with the pleated polyester spunbond nonwoven fabric of S1 to obtain a composite nonwoven fabric; S3: The components for preparing the two-component meltblown fabric are mixed, and after preparing the two-component meltblown fabric by the meltblowing method, the two-component meltblown fabric is directly compounded with the composite non-woven fabric of S2 to obtain a reusable three-component elastic non-woven fabric.

7. The process for producing a reusable three-component elastic nonwoven fabric according to claim 6, characterized in that: In step S1, the specific steps of the spunbond method are: drying the polyester masterbatch, heating, and extruding to obtain a viscous polymer melt; drawing the viscous polymer melt, dividing it into a web, and then hot-rolling and consolidating it to obtain a polyester spunbond nonwoven fabric; During hot rolling, the line pressure is 294-1177 N / m and the temperature is 250-300°C.

8. The process for producing a reusable three-component elastic nonwoven fabric according to claim 6, wherein: In the step S1, during the folding process, the fold height is 25 mm to 40 mm, and the fold distance is 4.0 mm to 5.2 mm; during the heat setting process, the heat setting temperature is 80° C. to 100° C., and the time is 1 min to 10 min.

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