A processing method for high-elastic non-woven fabric

Abstract

The present invention discloses a processing method of a high-elastic non-woven fabric, and belongs to the field of high-elastic non-woven fabric preparation. A processing method of a high-elastic non-woven fabric, the formula of the non-woven fabric includes a high-elastic fiber formula and a parallel bicomponent fiber formula, the parallel bicomponent fiber formula is made of the following raw materials in weight proportion: 95~99 parts of polypropylene, 0.5~1.5 parts of white masterbatch, 1~3 parts of lubricant and 3~5 parts of polybutylene succinate; the high-elastic fiber formula is made of the following raw materials in weight proportion, 66~72 parts of styrene-ethylene-butylene-styrene block copolymer, 27~34 parts of thermoplastic polyester elastomer TPEE, 1~3 parts of lubricant and 3~5 parts of polybutylene succinate; the polypropylene is homopolymer polypropylene or copolymer polypropylene. In the present invention, the addition of thermoplastic polyester elastomer TPEE not only improves the elasticity of the non-woven fabric, but also enhances the softness and air permeability of the non-woven fabric.

Description

Technical Field

[0001] The invention relates to the field of high-elastic non-woven fabric preparation, and more specifically, to a processing method of high-elastic non-woven fabric. Background Art

[0002] Nonwoven fabrics, also known as non-woven fabrics, are made of directional or random fibers and are a new generation of environmentally friendly materials. However, the lack of elasticity of traditional nonwoven fabrics has always been a technical challenge. In order to give nonwoven fabrics elasticity, a common solution is to embed elastic films, spandex yarns and other elastic materials between two layers of nonwoven fabrics; another method is to spray elastic materials on the surface of nonwoven fabrics, but these methods often significantly increase the weight of the product and increase the difficulty of subsequent processing.

[0003] To solve the above problems, a Chinese patent with announcement number CN107780047B announced on June 12, 2020 provides a method for preparing an elastic non-woven fabric, an elastic non-woven fabric and its application. The non-woven fabric provided in the document is endowed with elasticity by adding elastomers to the raw materials of the three-layer fiber web. However, this method requires the addition of a large amount of elastomer, which will increase the material cost and affect the wear resistance of the non-woven fabric, thereby shortening the service life of the non-woven fabric. In addition, the most fatal defect of the non-woven fabric is that the non-woven fabric is directly elastic and difficult to roll, which may affect the subsequent processing and efficiency of the non-woven fabric. In addition, the raw materials used in the non-woven fabric are mainly non-degradable materials such as polypropylene and vinyl polymers. After the service life of the non-woven fabric ends, it may have a long-term impact on the environment.

[0004] Therefore, it is necessary to provide a new processing method for high-elastic non-woven fabrics; using the processing method, non-woven fabrics with good elasticity and wear resistance can be prepared. Summary of the invention

[0005] In view of the problems existing in the prior art, the object of the present invention is to provide a processing method of a high-elastic non-woven fabric.

[0006] To solve the above problems, the present invention adopts the following technical solutions.

[0007] A formula for a high-elastic nonwoven fabric, comprising a high-elastic fiber formula and a parallel bicomponent fiber formula, wherein the parallel bicomponent fiber formula is made of the following raw materials in a weight ratio: 95-99 parts of polypropylene, 0.5-1.5 parts of white masterbatch, 1-3 parts of a lubricant and 3-5 parts of polybutylene succinate; the high-elastic fiber formula is made of the following raw materials in a weight ratio: 66-72 parts of styrene-ethylene-butylene-styrene block copolymer, 27-34 parts of thermoplastic polyester elastomer TPEE, 1-3 parts of a lubricant and 3-5 parts of polybutylene succinate;

[0008] The polypropylene is homopolypropylene or copolymer polypropylene.

[0009] Furthermore, the white masterbatch is one of wollastonite, mica powder and titanium dioxide; and the lubricant is one of erucamide, oleamide, fatty acid amide and acetic acid amide.

[0010] The present invention also provides a method for processing a high-elastic non-woven fabric, the method comprising the following steps:

[0011] Step 1: the raw materials of the parallel bicomponent fiber are mixed according to the formula and added to two different screw extruders of die head A for extrusion melting, filtering, and then metered and transported to the spinneret assembly of die head A for converging spinning and filament separation to obtain the first parallel bicomponent fiber;

[0012] Step 2: The raw materials of the high-elastic fiber are mixed according to the formula and added to two different screw extruders of the B die head for extrusion melting, filtering, and then metered and transported to the spinneret assembly of the B die head for converging spinning and filament separation to obtain the high-elastic fiber;

[0013] Step 3: the raw materials of the parallel bicomponent fiber are mixed according to the formula and added to two different screw extruders of the C die head for extrusion melting, filtering, and then metered and transported to the spinneret assembly of the C die head for converging spinning and filament separation to obtain the second parallel bicomponent fiber;

[0014] Step 4: On the mesh curtain, the high elastic fiber in step 2 is used as the middle layer, the first parallel bicomponent fiber in step 1 is used as the upper layer, and the second parallel bicomponent fiber in step 3 is used as the lower layer, and the high elastic non-woven fabric is obtained after online laying, pre-consolidation, reinforcement and bonding.

[0015] Furthermore, in step 1, the temperatures of the two different screw extruders of the A die are 200-250°C and 180-260°C, respectively; in step 2, the temperatures of the two different screw extruders of the B die are 200-250°C and 180-260°C, respectively; in step 3, the temperatures of the two different screw extruders of the C die are 200-250°C and 180-260°C, respectively.

[0016] Furthermore, the temperatures of the two different screw extruders of die head A are 200~250℃ and 180~260℃ respectively; the temperature of the spinneret assembly of die head A is 220~260℃; spinning is carried out by cold air duct drawing, the temperature of the cold air is 15~25℃, and the wind pressure is 1000~4000Pa.

[0017] Furthermore, the temperatures of the two different screw extruders of the B die are 200~250℃ and 180~260℃ respectively; the metered extrusion amount is 450~500kg / h, and the temperature of the spinneret assembly of the B die is 200~450℃; the spinning is carried out by cold air duct drawing, the temperature of the cold air is 8~30℃, and the wind pressure is 500~3000Pa.

[0018] Furthermore, the temperatures of the two different screw extruders of the C die are 200~250℃ and 180~260℃ respectively; the temperature of the spinneret assembly of the C die is 220~260℃; the spinning is carried out by cold air duct drawing, the temperature of the cold air is 15~25℃, and the wind pressure is 1000~4000Pa.

[0019] Furthermore, in step 4, the web laying speed is 50-400 m / min.

[0020] Furthermore, after laying the web, a fiber web is formed, and the fiber web is transported to a pre-consolidation device under the negative pressure of the suction wind.

[0021] Furthermore, in step 4, the pre-consolidation device is a pre-pressing roller or a hot air knife, the temperature of the pre-pressing roller is 50-120°C; the temperature of the hot air knife is 100-160°C.

[0022] Furthermore, in step 4, the consolidation operation is hot pressing consolidation, hot air consolidation, water entanglement consolidation or needle punching consolidation.

[0023] Furthermore, the device used for hot pressing consolidation is a hot rolling mill, the hot pressing temperature of the hot rolling mill is 100-150° C., and the line pressure is 75-105 N / mm.

[0024] Furthermore, the device used for water-entanglement consolidation is a water-entanglement machine, the water-entanglement pressure of the water-entanglement machine is 10-40Mpa, and the drying temperature is 100-130°C.

[0025] Furthermore, the device used for hot air blower consolidation is an oven, and the temperature of the oven is 100-150°C.

[0026] Furthermore, the frequency of the acupuncture machine used for acupuncture consolidation is 1000-3000 punctures / minute.

[0027] Furthermore, the processing method also includes mechanical activation, and the mechanical activation is online activation or offline activation.

[0028] Furthermore, according to the downstream use requirements, the elasticity of the non-woven fabric can be activated online or offline. The specific operation of the activation is: after the non-woven fabric is heated by a hot roller at a temperature of 60~150℃, it is passed through a cooling roller at a temperature of 8~25℃ for low-temperature shaping.

[0029] Compared with the prior art, the advantages of the present invention are:

[0030] 1. This solution effectively improves the thermal stability of styrene-ethylene-butylene-styrene block copolymer (SEBS) by introducing thermoplastic polyester elastomer TPEE into SEBS. This improvement makes SEBS less likely to degrade during high-temperature preparation, thereby improving the breaking strength and breaking force of the non-woven fabric and significantly improving the elasticity of the non-woven fabric. In addition, the addition of TPEE not only improves the elasticity and recovery force of the non-woven fabric, but also makes the prepared non-woven fabric have good elongation at break and elongation at break; it also makes the non-woven fabric have good air permeability and softness.

[0031] 2. The non-woven fabric raw material formula and the ratio between the components in the formula provided by this scheme significantly improve the elastic properties of the non-woven fabric. In addition, the polybutylene succinate used in the formula of this scheme is a degradable particle. The addition of this substance improves the environmental performance of the non-woven fabric, so that the non-woven fabric prepared by this scheme can be naturally decomposed after the end of its service life, thereby reducing the impact on the environment.

[0032] 3. The processing method provided in this scheme consolidates the parallel bicomponent fibers prepared by die A and die C and the elastic fibers prepared by die B, thereby limiting the stretching of the elastic fibers prepared by die B in the middle layer, so that the high elastic nonwoven fabric before activation does not show an elastic effect. This process and fiber combination are designed to ensure the softness of the product and enable the nonwoven fabric to have excellent elongation after activation, thereby increasing the efficiency of nonwoven fabric winding and slitting. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 The present invention is a flow chart of the processing method of preparing the high-elastic nonwoven fabric formula. DETAILED DESCRIPTION

[0034] Embodiment 1:

[0035] A high-elastic non-woven fabric, the processing method of which is as follows:

[0036] (1) Preparation of the first parallel bicomponent fiber

[0037] 95 parts of homopolypropylene, 0.5 parts of titanium dioxide, 2 parts of erucamide and 4 parts of polybutylene succinate were weighed, mixed and added to the first screw extruder of die head A; extrusion melting was carried out under the condition that the temperature of the first screw extruder was 200-250° C. to obtain a hot melt; then, the hot melt was filtered and metered through a filtration system and a metering pump, and the metering pump transmitted the hot melt to the spinneret assembly of die head A at a rate of 450-500 kg / h. At the same time, 95 parts of copolymerized polypropylene, 0.5 parts of titanium dioxide, 2 parts of erucamide and 4 parts of polybutylene succinate are weighed, mixed and added to the second screw extruder of die head A, and extruded and melted at a temperature of 180-260° C. in the second screw extruder to obtain a second hot melt; then the second hot melt is filtered and metered through a filtration system and a metering pump, and the metering pump transfers the hot melt to the spinneret assembly of die head A at a rate of 450-500 kg / h, and convergent spinning is carried out at a temperature of 220-260° C. in the spinneret assembly of die head A, and monomers or other low molecular weight substances that do not meet the requirements are discharged at the same time, and then the nascent filaments are drawn in a cold air duct with a cold air temperature of 15-25° C. and a wind pressure of 1000-4000 Pa. The nascent filaments are passed through a bellows with a main draft of 10-80% and an auxiliary draft of 20-90%, and the auxiliary filaments are drawn under the action of the main and auxiliary drafts to obtain the first parallel bicomponent fibers.

[0038] (2) Preparation of high elastic fibers

[0039] 31 parts of thermoplastic polyester elastomer TPEE, 67 parts of styrene-ethylene-butylene-styrene block copolymer, 2 parts of erucamide and 4 parts of polybutylene succinate were weighed, mixed and added to the third screw extruder of the B die head; 33 parts of thermoplastic polyester elastomer TPEE, 69 parts of styrene-ethylene-butylene-styrene block copolymer, 2 parts of erucamide and 4 parts of polybutylene succinate were weighed, mixed and added to the fourth screw extruder of the B die head; the temperature of the third screw extruder was 200-250°C and the fourth screw The extruder is extruded and melted at a temperature of 180-260°C to obtain a hot melt; the two hot melts are filtered and metered by the filtration system and the metering pump respectively, and the metering pump transmits the hot melt to the spinneret assembly of the B die at an extrusion rate of 450-500 kg / h, and performs converging spinning at a temperature of 200-450°C, while discharging monomers or other low molecular weight substances that do not meet the requirements; then the primary filaments are drawn through a cold air duct at a temperature of 8-30°C and a wind pressure of 500-3000 Pa to obtain the primary filaments. The primary filaments are drawn under the joint action of 10-80% main exhaust and 20-90% auxiliary exhaust to obtain high elastic fibers.

[0040] (3) Preparation of the second parallel bicomponent fiber

[0041] 95 parts of homopolypropylene, 2 parts of erucamide, 0.5 parts of titanium dioxide and 4 parts of polybutylene succinate are weighed by weight, mixed and added to the fifth screw extruder and the sixth screw extruder of the C die respectively, and extruded and melted at a temperature of 200-250° C. in the fifth screw extruder; extruded and melted at a temperature of 180-260° C. in the sixth screw extruder, and the two hot-melt materials are filtered and metered by a filtration system and a metering pump respectively, and the metering pump transmits them to the C die spinneret assembly at an extrusion rate of 450-500 kg / h, and convergent spinning is carried out at a temperature of 220-260° C., and monomers or other low molecular weight substances that do not meet the requirements are discharged at the same time; then, the nascent filaments are drawn through a cold air duct at a temperature of 15-25° C. and a wind pressure of 1000-4000 Pa. The primary filaments are drawn under the combined action of the main draft of 10-80% and the auxiliary draft of 20-90% to obtain the second parallel bicomponent fibers.

[0042] (4) Preparation of non-woven fabrics

[0043] The first parallel bicomponent fiber, high elastic fiber and second parallel bicomponent fiber are compounded online in order from top to bottom, and then the fiber is laid on the mesh curtain of the mesh belt machine at a speed of 50~400m / min to form a uniform fiber web. The fiber web is conveyed to a pre-pressing roller or a hot air knife for pre-consolidation to obtain a pre-consolidated fiber web; the pre-consolidated fiber web is conveyed to a hot rolling mill or a spunlace machine or a hot air machine or a needle punch machine for bonding and reinforcement to obtain an unactivated non-woven fabric. The non-woven fabric is conveyed to a hot roller at a temperature of 60~150℃ for online mechanical activation, and then the activated non-woven fabric is passed through a cooling roller at a temperature of 8~25℃ for low-temperature shaping to obtain an activated non-woven fabric; finally, it is rolled into a cloth roll by a winding machine and divided according to needs.

[0044] Embodiment 2:

[0045] The difference between this embodiment and embodiment 1 is that:

[0046] The raw materials added to the first screw extruder of die head A in step (1) are: by weight, 97 parts of homopolymer polypropylene, 1 part of titanium dioxide, 2 parts of erucic acid amide and 4 parts of polybutylene succinate; the raw materials added to the second screw extruder of die head A are: by weight, 97 parts of copolymer polypropylene, 1 part of titanium dioxide, 2 parts of erucic acid amide and 4 parts of polybutylene succinate.

[0047] The raw materials added to the third screw and the fourth screw extruder of the B die in step (2) are: by weight, 68 parts of styrene-ethylene-butylene-styrene block copolymer, 30 parts of thermoplastic polyester elastomer TPEE, 2 parts of erucamide and 5 parts of polybutylene succinate.

[0048] The raw materials added to the fifth screw extruder of the C die in step (3) are: by weight, 97 parts of homopolymer polypropylene, 1 part of titanium dioxide, 2 parts of erucamide and 3 parts of polybutylene succinate; the raw materials added to the sixth screw extruder of the C die are: by weight, 97 parts of copolymer polypropylene, 1 part of titanium dioxide, 2 parts of erucamide and 3 parts of polybutylene succinate.

[0049] Embodiment 3:

[0050] The difference between this embodiment and embodiment 1 is that:

[0051] The raw materials added to the first screw extruder of die head A in step (1) are: by weight, 99 parts of homopolypropylene, 1.5 parts of titanium dioxide, 3 parts of erucic acid amide and 5 parts of polybutylene succinate; the raw materials added to the second screw extruder of die head A are: by weight, 99 parts of copolymer polypropylene, 1.5 parts of titanium dioxide, 3 parts of erucic acid amide and 5 parts of polybutylene succinate.

[0052] The raw materials added to the B-die third screw extruder and the fourth screw extruder in step (2) are: by weight, 72 parts of styrene-ethylene-butylene-styrene block copolymer, 34 parts of thermoplastic polyester elastomer TPEE, 3 parts of erucamide and 5 parts of polybutylene succinate.

[0053] The raw materials added to the C-die fifth screw extruder and the sixth screw extruder in step (3) are: 99 parts of homopolymer polypropylene, 1.5 parts of titanium dioxide, 3 parts of erucamide and 5 parts of polybutylene succinate, by weight.

[0054] Embodiment 4:

[0055] The difference between this embodiment and embodiment 1 is that:

[0056] The raw materials added to the A die first screw extruder and the second screw extruder in step (1) are: 95 parts of homopolymer polypropylene, 0.5 parts of titanium dioxide, 1 part of erucic acid amide and 3 parts of polybutylene succinate, by weight.

[0057] The raw materials added to the B-die third screw extruder and the fourth screw extruder in step (2) are: in parts by weight, 66 parts of styrene-ethylene-butylene-styrene block copolymer, 27 parts of thermoplastic polyester elastomer TPEE, 1 part of erucamide and 3 parts of polybutylene succinate.

[0058] The raw materials added to the C-die fifth screw extruder and the sixth screw extruder in step (3) are: 95 parts of homopolymer polypropylene, 0.5 parts of titanium dioxide, 1 part of erucamide and 3 parts of polybutylene succinate, by weight.

[0059] Embodiment 5:

[0060] The difference between this embodiment and embodiment 1 is that:

[0061] In step (1), the raw materials added to the first screw extruder and the second screw extruder by die head A are: 93 parts of homopolymer polyethylene, 0.2 parts of titanium dioxide, 0.5 parts of oleic acid amide and 2 parts of polyalkyl fatty acid, by weight.

[0062] The raw materials added to the B-die third screw extruder and the fourth screw extruder in step (2) are: 63 parts by weight of styrene-ethylene-butylene-styrene block copolymer, 26 parts of thermoplastic polyester elastomer TPEE, 0.5 parts of oleic acid amide and 2 parts of polyalkyl fatty acid.

[0063] The raw materials added to the C-die fifth screw extruder and the sixth screw extruder in step (3) are: 93 parts of homopolymer polyethylene, 1 part of titanium dioxide, 1 part of oleic acid amide and 3 parts of polyalkyl fatty acid, by weight.

[0064] Embodiment 6:

[0065] The difference between this embodiment and embodiment 1 is that:

[0066] The raw materials added to the first screw extruder of die head A in step (1) are: by weight, 100 parts of homopolymer polypropylene, 2 parts of titanium dioxide, 4 parts of erucic acid amide and 7 parts of polybutylene succinate; the raw materials added to the second screw extruder of die head A are: by weight, 101 parts of copolymer polypropylene, 2 parts of titanium dioxide, 4 parts of erucic acid amide and 7 parts of polybutylene succinate.

[0067] The raw materials added to the B-die third screw extruder and the fourth screw extruder in step (2) are: by weight, 75 parts of styrene-ethylene-butylene-styrene block copolymer, 37 parts of thermoplastic polyester elastomer TPEE, 5 parts of erucamide and 7 parts of polybutylene succinate.

[0068] The raw materials added to the C-die fifth screw extruder and the sixth screw extruder in step (3) are: by weight, 103 parts of homopolymer polypropylene, 3 parts of titanium dioxide, 7 parts of erucamide and 9 parts of polybutylene succinate.

[0069] Comparative Example 1:

[0070] This comparative example is different from Example 1 in that:

[0071] The raw materials added to the first screw extruder of die head A in step (1) are: by weight, 95 parts of homopolymer polypropylene, 2 parts of titanium dioxide and 0.5 parts of erucamide; the raw materials added to the second screw extruder of die head A are: by weight, 95 parts of copolymer polypropylene, 0.5 parts of titanium dioxide, 2 parts of erucamide and 4 parts of polybutylene succinate.

[0072] The raw materials added to the B-die third screw extruder and the fourth screw extruder in step (2) are: 68 parts by weight of styrene-ethylene-butylene-styrene block copolymer and 2 parts of erucamide.

[0073] The raw materials added to the C-die fifth screw extruder and the sixth screw extruder in step (3) are: 95 parts of homopolymer polypropylene, 0.5 parts of titanium dioxide and 2 parts of erucamide, by weight.

[0074] Test Example 1:

[0075] The nonwoven fabrics involved in Examples 1 to 6 and Comparative Example 1 were subjected to tensile tests, and the test results are shown in the following table:

[0076] Table 1 Tensile test results of nonwoven fabrics involved in Examples 1 to 6 and Comparative Example 1

[0077]

[0078] As can be seen from Table 1, when the parallel two-component formula is 95-99 parts of polypropylene, 0.5-1.5 parts of white masterbatch, 1-3 parts of lubricant and 3-5 parts of polybutylene succinate; when the high elastic fiber formula is 66-72 parts of styrene-ethylene-butylene-styrene block copolymer, 27-34 parts of thermoplastic polyester elastomer TPEE, 1-3 parts of lubricant and 3-5 parts of polybutylene succinate, its breaking strength can reach more than 21.71N, and the breaking strength can reach more than 0.37N / mm; as can be seen from Example 5, when the weight parts of each component are reduced, the breaking strength of the non-woven fabric is reduced to 13.75N, and the breaking strength is reduced to 0.11N / mm; as can be seen from Example 6, when the weight parts of each component in the formula are increased, the breaking strength of the prepared non-woven fabric is reduced by 15.73N, and the breaking strength is reduced to 0.18N / mm. These data indicate that increasing or decreasing the weight fraction of each group in the formula cannot increase the breaking strength and breaking tenacity of the nonwoven fabric.

[0079] As can be seen from Table 1, the breaking strength and breaking force of the nonwoven fabrics prepared in Examples 1 to 6 are significantly greater than the breaking strength and breaking strength of the nonwoven fabrics prepared in Comparative Example 1. The breaking elongation and breaking elongation of the nonwoven fabrics prepared in Examples 1 to 6 are significantly greater than the breaking elongation and breaking elongation of the nonwoven fabrics prepared in the comparative example; this indicates that the nonwoven fabrics prepared in this scheme can not only withstand one-time stretching, but also maintain stable performance in repeated stretching and compression. This lasting elasticity and deformation resistance ensure the durability and reliability of the nonwoven fabrics during long-term use.

[0080] It can be seen from Examples 1 to 4 that the elongation at break of the non-woven fabric prepared by this scheme can reach more than 113.83 mm, and the elongation at break can reach more than 41.20%. These data show that the non-woven fabric prepared by this scheme can not only withstand one-time stretching, but also maintain stable performance in repeated stretching and compression. This long-lasting elasticity and deformation resistance ensure the durability and reliability of the non-woven fabric during long-term use.

[0081] Test Example 2:

[0082] The physical properties of the non-woven fabrics in the unactivated state involved in Examples 1 to 6 and Comparative Example 1 were tested, and the specific test results are shown in Table 2.

[0083] Table 2 Physical properties of nonwoven fabrics in an unactivated state

[0084]

[0085] Test Example 3:

[0086] The physical properties of the activated nonwoven fabrics involved in Examples 1 to 6 and Comparative Example 1 were tested, and the specific test results are shown in Table 3.

[0087] Table 3 Physical properties of nonwoven fabrics in activated state

[0088]

[0089] It can be seen from the data in Table 2 and Table 3 that the nonwoven fabric processed by the present invention can have good lightness, softness and air permeability. In addition, whether before or after mechanical activation, these characteristics of the nonwoven fabric prepared by the present invention can be maintained, and the increase in elasticity does not sacrifice other physical properties. This means that the nonwoven fabric prepared by the present invention increases the elasticity of the nonwoven fabric after activation treatment, while still maintaining the original lightness, softness and air permeability, thereby ensuring the comprehensiveness and reliability of the nonwoven fabric prepared by the method in practical applications.

Claims

1. A method for processing a high-elastic nonwoven fabric, characterized in that: The formula of the nonwoven fabric includes a high-elastic fiber formula and a parallel bicomponent fiber formula, wherein the parallel bicomponent fiber formula is made of the following raw materials in weight proportion: 95-99 parts of polypropylene, 0.5-1.5 parts of white masterbatch, 1-3 parts of lubricant and 3-5 parts of polybutylene succinate; the high-elastic fiber formula is made of the following raw materials in weight proportion: 66-72 parts of styrene-ethylene-butylene-styrene block copolymer, 27-34 parts of thermoplastic polyester elastomer TPEE, 1-3 parts of lubricant and 3-5 parts of polybutylene succinate; the polypropylene is homopolymer polypropylene or copolymer polypropylene; The processing method comprises the following steps: Step 1: the raw materials of the parallel bicomponent fiber are mixed according to the formula and added to two different screw extruders of die head A for extrusion melting, filtering, and then metered and transported to the spinneret assembly of die head A for converging spinning and filament separation to obtain the first parallel bicomponent fiber; Step 2: The raw materials of the high-elastic fiber are mixed according to the formula and added to two different screw extruders of the B die head for extrusion melting, filtering, and then metered and transported to the spinneret assembly of the B die head for converging spinning and filament separation to obtain the high-elastic fiber; Step 3: The raw materials of the parallel bicomponent fiber are mixed according to the formula and added to two different screw extruders of the C die head for pressurized melting, filtering, and then metered and transported to the spinneret assembly of the C die head for converging spinning and filament separation to obtain the second parallel bicomponent fiber; Step 4: On the mesh curtain, the high elastic fiber in step 2 is used as the middle layer, the first parallel bicomponent fiber in step 1 is used as the upper layer, and the second parallel bicomponent fiber in step 3 is used as the lower layer, and the high elastic non-woven fabric is obtained after online laying, pre-consolidation, reinforcement and bonding.

2. The method for processing a high-elastic nonwoven fabric according to claim 1, characterized in that: The white masterbatch is one of wollastonite, mica powder and titanium dioxide; the lubricant is one of erucamide, oleamide, fatty acid amide and acetic acid amide.

3. The method for processing a high-elastic nonwoven fabric according to claim 1, characterized in that: The processing method also includes mechanical activation, which is online activation or offline activation; the specific operation of the mechanical activation is: after the non-woven fabric is heated by a hot roller with a temperature of 60-150°C, it is passed through a cooling roller with a temperature of 8-25°C for low-temperature shaping.

4. The method for processing a highly elastic nonwoven fabric according to claim 1, characterized in that: In step 1, the temperatures of the two different screw extruders of die head A are 200-250°C and 180-260°C respectively; In step 2, the temperatures of the two different screw extruders of die head B are 200-250°C and 180-260°C respectively; In step 3, the temperatures of the two different screw extruders of the C die are 200-250°C and 180-260°C, respectively.

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