Preparation method of non-woven fabric capable of providing strength of hot air

Abstract

The invention provides a preparation method for providing strength of a hot air non-woven fabric, and belongs to the technical field of non-woven fabric preparation, the preparation method comprises the following steps: taking a double-component spun-bonded non-woven fabric and a hot air non-woven fabric fiber net in a weight ratio of (11-13): (12-14) as raw materials, and blowing and drying with hot air to obtain the hot air non-woven fabric. According to the preparation method for providing the strength of the hot air non-woven fabric, the strength of the prepared hot air non-woven fabric can be remarkably improved, and meanwhile high bulkiness and softness of the hot air non-woven fabric are effectively kept.

Description

Technical Field

[0001] The invention relates to the technical field of non-woven fabric preparation, in particular to a method for preparing a hot air non-woven fabric with high strength. Background Art

[0002] Hot air nonwoven fabric is a nonwoven fabric that uses hot air to bond ES bicomponent fibers. Due to its high fluffiness and high softness, it is widely used in the field of personal hygiene products, such as diapers and sanitary napkins. However, due to the low strength of hot air nonwoven fabric (lateral and longitudinal strength), this greatly limits its scope of application. In some application scenarios that require higher strength, hot air nonwoven fabrics often cannot meet the requirements. Therefore, how to increase the strength of hot air nonwoven fabrics while maintaining their excellent softness and fluffiness has become a technical problem that needs to be solved urgently. Summary of the invention

[0003] In order to improve the strength of hot air nonwoven fabrics, expand their application fields, and provide the market and sellers with more comfortable nonwoven fabric choices, the present invention provides a preparation method for providing the strength of hot air nonwoven fabrics.

[0004] To achieve the above purpose, the technical solution adopted by the present invention is:

[0005] A preparation method for providing hot air nonwoven fabric with strength is to take a bicomponent spunbonded nonwoven fabric and a hot air nonwoven fabric fiber web with a weight ratio of 11-13:12-14 as raw materials, and blow and dry them with hot air to obtain the hot air nonwoven fabric.

[0006] Furthermore, the preparation method comprises the following specific steps:

[0007] Put the two-component spunbond nonwoven fabric on the hot air nonwoven fabric web to form a double-layer web;

[0008] The double-layer fiber web is passed through an unwinding mechanism and enters a hot air oven together, and is blown and dried by hot air to bond the double-component spunbond and hot air nonwoven fabrics together to obtain the hot air nonwoven fabric.

[0009] Furthermore, the hot air drying oven is divided into five drying chambers for drying.

[0010] Furthermore, the temperatures of the five oven chambers of the hot air oven are:

[0011] The oven temperature of the first chamber is 120-124°C and the wind pressure is 17.5-18.5Hz;

[0012] The oven temperature of the second chamber is 128-132°C and the wind pressure is 21.5-22.5Hz;

[0013] The oven temperature of the third chamber is 136-140°C and the wind pressure is 21.5-22.5Hz;

[0014] The oven temperature of the fourth chamber is 136-140°C and the wind pressure is 23.5-24.5Hz;

[0015] The oven temperature of the fifth chamber is 128-132°C and the wind pressure is 21.5-22.5Hz.

[0016] Furthermore, the machine speed of the unwinding mechanism is 95 to 105 m / min.

[0017] Furthermore, the double-layer fiber web is prepared by placing a two-component spunbond nonwoven fabric on a hot air nonwoven fabric production line, placing the hot air nonwoven fabric fiber web on a layer of an oven mesh belt, and placing the two-component spunbond nonwoven fabric on top of the hot air nonwoven fabric fiber web to form a double-layer fiber web.

[0018] Furthermore, in terms of weight percentage, the raw materials for making the two-component spunbonded nonwoven fabric include: 35-65% of polyethylene chips (abbreviated as PE) and the remainder of polypropylene chips (abbreviated as PP).

[0019] Furthermore, the preparation process of the bicomponent spunbonded nonwoven fabric is as follows:

[0020] Take polyethylene and polypropylene, soften and melt them under high temperature and shear extrusion to form corresponding polymers, then filter to remove impurities, and then spin them separately to form corresponding spinning, and then spin them, and cool and solidify to form PE+PP fibers;

[0021] The PE+PP fibers are stretched and thinned, and then form a fiber web under the action of web-forming suction wind;

[0022] The fiber web is subjected to hot air consolidation treatment to obtain the bicomponent spunbonded nonwoven fabric.

[0023] The beneficial effects of the method for preparing hot air nonwoven fabric of the present invention are as follows:

[0024] The present invention provides a preparation method for providing the strength of a hot air nonwoven fabric, which can significantly improve the strength of the prepared hot air nonwoven fabric, while effectively maintaining the high fluffiness and softness of the hot air nonwoven fabric;

[0025] The invention significantly improves the longitudinal and transverse strength of the nonwoven fabric by compounding the two-component spunbonded nonwoven fabric and the hot air nonwoven fabric;

[0026] Due to the improved strength of the hot air nonwoven fabric prepared by the present invention, the composite nonwoven fabric can be applied to more scenes requiring high strength, thus expanding its application range;

[0027] In the preparation process of the present invention, no glue or mechanical embossing is required, thus avoiding additional chemical addition and mechanical damage and maintaining the natural characteristics of the non-woven fabric. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the present invention are described clearly and completely below. In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention can also be implemented in other ways different from those described herein, and those skilled in the art can make similar generalizations without violating the connotation of the present invention, so the present invention is not limited by the specific embodiments disclosed below.

[0029] Example 1 A method for preparing a hot air nonwoven fabric with high strength

[0030] This embodiment is a method for preparing a hot air nonwoven fabric with high strength, which specifically includes the following steps:

[0031] S1. Use the traditional production process of two-component spunbond nonwoven fabric to prepare two-component spunbond nonwoven fabric

[0032] S11, taking polyethylene chips (PE for short) and polypropylene chips (PP for short) at a weight percentage of 50%:50% and adding them to a screw extruder through a hopper respectively, softening and melting under the action of high temperature and shear extrusion to form corresponding polymers, and then filtering through a melt filter to remove impurities, and then respectively entering a spinning box through a spinning pump to spin to form corresponding spinning, and then spinning through a spinneret at a weight ratio of 1:1, and cooling and solidifying by a cooling method to form PE+PP fibers;

[0033] S12, PE+PP fibers enter the drafter together with the drafting airflow, are further stretched and refined, and then are guided by the mesh belt into the web-forming machine to form a fiber web under the action of the web-forming suction air;

[0034] S13, the formed fiber web is subjected to hot air consolidation treatment by a winder to obtain a two-component spunbond nonwoven fabric.

[0035] The entire preparation process of the bicomponent spunbond nonwoven fabric is exactly the same as the production process of the conventional bicomponent spunbond nonwoven fabric, so those skilled in the art can prepare the bicomponent spunbond nonwoven fabric through the conventional production process of the bicomponent spunbond nonwoven fabric.

[0036] S2. Preparation of hot air nonwoven fabric

[0037] S21, taking a two-component spunbond nonwoven fabric with a weight ratio of 12:13 and putting it on a hot air nonwoven fabric production line, placing the hot air nonwoven fabric fiber web on a layer of the oven mesh belt, and placing the two-component spunbond nonwoven fabric on the hot air nonwoven fabric fiber web to form a double-layer fiber web;

[0038] S22. Take the double-layer fiber web and pass it through the unwinding mechanism and enter the hot air oven together. After hot air drying, the two-component spunbond and hot air non-woven fabrics are bonded together to obtain 25g high-strength hot air non-woven fabric (25g refers to the gram weight of the high-strength hot air non-woven fabric, that is, the weight of high-strength hot air non-woven fabric per square meter is 25g), marked as RB1.

[0039] The hot air oven is divided into five oven chambers, and the temperature of each oven chamber is set as follows:

[0040] The oven temperature in the first chamber is 122°C and the wind pressure is 18Hz;

[0041] The oven temperature in the second chamber is 130°C and the wind pressure is 22Hz;

[0042] The oven temperature of the third chamber is 138°C and the wind pressure is 22Hz;

[0043] The oven temperature of the fourth chamber is 138°C and the wind pressure is 24Hz;

[0044] The oven temperature of the fifth chamber is 130°C and the wind pressure is 22Hz;

[0045] The machine speed of the unwinding mechanism is 100 m / min.

[0046] The high-strength hot air nonwoven fabric RB1 has both high strength and high fluffy softness. Further testing of the high-strength hot air nonwoven fabric RB1 showed that its MD strength was 60N and CD strength was 25N, which is significantly improved compared to the existing 25g hot air fabric with MD strength of 40N and CD strength of 11N.

[0047] Example 2 A method for preparing a hot air nonwoven fabric with high strength

[0048] This embodiment is a method for preparing a hot air nonwoven fabric with high strength, which specifically includes the following steps:

[0049] S1. Use the traditional production process of two-component spunbond nonwoven fabric to prepare two-component spunbond nonwoven fabric

[0050] S11, according to the weight percentage of 35%:65%, PE and PP are added to the screw extruder through the hopper respectively, softened and melted under the action of high temperature and shear extrusion to form corresponding polymers, and then filtered through the melt filter to remove impurities, and then respectively enter the spinning box through the spinning pump to spin to form corresponding spinning, and then spin through the spinneret at a weight ratio of 1:1, and cool and solidify by cooling method to form PE+PP fiber;

[0051] S12, PE+PP fibers enter the drafter together with the drafting airflow, are further stretched and refined, and then are guided by the mesh belt into the web-forming machine to form a fiber web under the action of the web-forming suction air;

[0052] S13, the formed fiber web is subjected to hot air consolidation treatment by a winder to obtain a two-component spunbond nonwoven fabric.

[0053] The entire preparation process of the bicomponent spunbond nonwoven fabric is exactly the same as the production process of the conventional bicomponent spunbond nonwoven fabric, so those skilled in the art can prepare the bicomponent spunbond nonwoven fabric through the conventional production process of the bicomponent spunbond nonwoven fabric.

[0054] S2. Preparation of hot air nonwoven fabric

[0055] S21, taking a bicomponent spunbond nonwoven fabric with a weight ratio of 11:14 and putting it on a hot air nonwoven fabric production line, placing the hot air nonwoven fabric web on a layer of the oven mesh belt, and placing the bicomponent spunbond nonwoven fabric on the hot air nonwoven fabric web to form a double-layer fiber web;

[0056] S22, take the double-layer fiber web through the unwinding mechanism and put it into the hot air oven together, and bond the two-component spunbond and hot air non-woven fabrics together through hot air drying to obtain 25g high-strength hot air non-woven fabric, which is marked as RB2.

[0057] The hot air oven is divided into five oven chambers, and the temperature of each oven chamber is set as follows:

[0058] The oven temperature in the first chamber is 120°C and the wind pressure is 18.5Hz;

[0059] The oven temperature in the second chamber is 128°C and the wind pressure is 22.5Hz;

[0060] The oven temperature of the third chamber is 136°C and the wind pressure is 22.5Hz;

[0061] The oven temperature of the fourth chamber is 136°C and the wind pressure is 24.5Hz;

[0062] The oven temperature of the fifth chamber is 128°C and the wind pressure is 22.5Hz;

[0063] The machine speed of the unwinding mechanism is 95 m / min.

[0064] The high-strength hot air nonwoven fabric RB2 has both high strength and high fluffy softness. Further testing of the high-strength hot air nonwoven fabric RB2 showed that its MD strength was 59N and its CD strength was 24N.

[0065] Example 3 A method for preparing a hot air nonwoven fabric with high strength

[0066] This embodiment is a method for preparing a hot air nonwoven fabric with high strength, which specifically includes the following steps:

[0067] S1. Use the traditional production process of two-component spunbond nonwoven fabric to prepare two-component spunbond nonwoven fabric

[0068] S11, taking PE and PP at a weight percentage of 65%:35% and adding them to a screw extruder through a hopper respectively, softening and melting under the action of high temperature and shear extrusion to form corresponding polymers, and then filtering through a melt filter to remove impurities, and then respectively entering a spinning box through a spinning pump to spin to form corresponding spinning, and then spinning through a spinneret at a weight ratio of 1:1, and cooling and solidifying by a cooling method to form PE+PP fibers;

[0069] S12, PE+PP fibers enter the drafter together with the drafting airflow, are further stretched and refined, and then are guided by the mesh belt into the web-forming machine to form a fiber web under the action of the web-forming suction air;

[0070] S13, the formed fiber web is subjected to hot air consolidation treatment by a winder to obtain a two-component spunbond nonwoven fabric.

[0071] The entire preparation process of the bicomponent spunbond nonwoven fabric is exactly the same as the production process of the conventional bicomponent spunbond nonwoven fabric, so those skilled in the art can prepare the bicomponent spunbond nonwoven fabric through the conventional production process of the bicomponent spunbond nonwoven fabric.

[0072] S2. Preparation of hot air nonwoven fabric

[0073] S21, taking a bicomponent spunbond nonwoven fabric with a weight ratio of 13:12 and putting it on a hot air nonwoven fabric production line, placing the hot air nonwoven fabric web on a layer of the oven mesh belt, and placing the bicomponent spunbond nonwoven fabric on the hot air nonwoven fabric web to form a double-layer fiber web;

[0074] S22, take the double-layer fiber web through the unwinding mechanism and put it into the hot air oven together, and bond the two-component spunbond and hot air non-woven fabrics together through hot air drying to obtain 25g high-strength hot air non-woven fabric, which is marked as RB3.

[0075] The hot air oven is divided into five oven chambers, and the temperature of each oven chamber is set as follows:

[0076] The oven temperature in the first chamber is 124°C and the wind pressure is 17.5Hz;

[0077] The oven temperature in the second chamber is 132°C and the wind pressure is 21.5Hz;

[0078] The oven temperature of the third chamber is 140°C and the wind pressure is 21.5Hz;

[0079] The oven temperature of the fourth chamber is 140°C and the wind pressure is 23.5Hz;

[0080] The oven temperature in the fifth chamber is 132°C and the wind pressure is 21.5Hz;

[0081] The machine speed of the unwinding mechanism is 105 m / min.

[0082] The high-strength hot air nonwoven fabric RB3 has both high strength and high fluffy softness. Further testing of the high-strength hot air nonwoven fabric RB3 showed that its MD strength was 60N and its CD strength was 24N.

[0083] Comparative Examples 1 to 7 provide a method for preparing a strong hot air nonwoven fabric

[0084] Comparative Examples 1 to 4 are respectively a method for preparing a hot air nonwoven fabric with high strength, and their steps are basically the same as those of Example 1, and the two-component spunbond nonwoven fabrics used are all the two-component spunbond nonwoven fabrics prepared in Example 1, and the only difference is that:

[0085] In step S21 of comparative example 1, a bicomponent spunbond nonwoven fabric and a hot air nonwoven fabric with a weight ratio of 6:19 are used as raw materials, and other process steps and parameters are exactly the same as those in example 1, to obtain 25 g of hot air nonwoven fabric, which is marked as DRB1. The MD strength of the hot air nonwoven fabric DRB1 is 45N and the CD strength is 13N.

[0086] In step S21 of comparative example 2, a bicomponent spunbond nonwoven fabric and a hot air nonwoven fabric with a weight ratio of 15:10 are used as raw materials, and other process steps and parameters are exactly the same as those in example 1, to obtain 25 g of hot air nonwoven fabric, which is marked as DRB2. The MD strength of the hot air nonwoven fabric DRB2 is 50N and the CD strength is 22N.

[0087] By comparing Comparative Examples 1 and 2 with Example 1, it can be seen that whether increasing the proportion of the two-component spunbond nonwoven fabric (i.e., Comparative Example 2) or reducing the proportion of the two-component spunbond nonwoven fabric (i.e., Comparative Example 1) will result in different degrees of reduction in the MD strength and CD strength of the hot air nonwoven fabric. Therefore, a high-strength hot air nonwoven fabric can only be made when a specific proportion of the two-component spunbond nonwoven fabric and the hot air nonwoven fabric are used as raw materials.

[0088] The temperature of the hot air oven in step S22 of comparative example 3 is changed to:

[0089] The oven temperature in the first chamber is 122°C and the wind pressure is 18Hz;

[0090] The oven temperature of the second chamber is 152°C and the wind pressure is 22Hz;

[0091] The oven temperature of the third chamber is 156°C and the wind pressure is 22Hz;

[0092] The oven temperature of the fourth chamber is 156°C and the wind pressure is 24Hz;

[0093] The oven temperature in the fifth chamber is 128°C and the wind pressure is 22Hz;

[0094] The machine speed of the unwinding mechanism is 100 m / min;

[0095] The other process steps and parameters in Comparative Example 3 are exactly the same as those in Example 1, and 25 g of hot air nonwoven fabric is prepared, which is marked as DRB3. The MD strength of the hot air nonwoven fabric DRB3 is 35N and the CD strength is 8.5N.

[0096] The temperature of the hot air oven in step S22 of comparative example 4 is changed to:

[0097] The oven temperature in the first chamber is 102°C and the wind pressure is 18Hz;

[0098] The oven temperature in the second chamber is 112°C and the wind pressure is 22Hz;

[0099] The oven temperature of the third chamber is 116°C and the wind pressure is 22Hz;

[0100] The oven temperature of the fourth chamber is 116°C and the wind pressure is 24Hz;

[0101] The oven temperature in the fifth chamber is 108°C and the wind pressure is 22Hz;

[0102] The machine speed of the unwinding mechanism is 100 m / min;

[0103] The other process steps and parameters in Comparative Example 4 are exactly the same as those in Example 1, and 25 g of hot air nonwoven fabric is prepared, which is marked as DRB4. The MD strength of hot air nonwoven fabric DRB4 is 15N and the CD strength is 3.5N.

[0104] By comparing Comparative Examples 3 and 4 with Example 1, it can be seen that whether the temperature of the oven is increased (i.e., Comparative Example 3) or decreased (i.e., Comparative Example 4), the MD strength and CD strength of the hot air nonwoven fabric produced will be reduced to varying degrees. Therefore, a specific oven temperature must be used for hot air blowing to produce a high-strength hot air nonwoven fabric.

[0105] Comparative Examples 5 to 6 are respectively a method for preparing hot air nonwoven fabrics with high strength, and their steps are basically the same as those of Example 1, except that:

[0106] In step S1 of comparative example 5, only PE is used as a raw material to replace the original PE and PP raw materials (i.e., PP is not used), and a PE spunbond nonwoven fabric is made by a conventional production process of a two-component spunbond nonwoven fabric (i.e., a single PE component replaces two components for two-component spunbond production); and then the two-component spunbond nonwoven fabric in step S2 is replaced by a PE spunbond nonwoven fabric, and 25 g of hot air nonwoven fabric is prepared according to step S2 of example 1. The other process steps and parameters in the entire preparation process are exactly the same as those in example 1, and the obtained 25 g of hot air nonwoven fabric is marked as DRB5. The MD strength of the hot air nonwoven fabric DRB5 is 42N, and the CD strength is 11.5N.

[0107] In step S1 of comparative example 6, only PP is used as a raw material to replace the original PE and PP raw materials (i.e., PE is not used), and the PP spunbond nonwoven fabric is made by the traditional production process of the two-component spunbond nonwoven fabric (i.e., a single PP component replaces two components for the two-component spunbond production); and then the PP spunbond nonwoven fabric is used to replace the two-component spunbond nonwoven fabric in step S2, and 25g of hot air nonwoven fabric is prepared according to step S2 of example 1. The other process steps and parameters in the whole preparation process are exactly the same as those in example 1, and the obtained 25g of hot air nonwoven fabric is marked as DRB6. The MD strength of the hot air nonwoven fabric DRB6 is 42N and the CD strength is 15N.

[0108] By comparing Comparative Examples 5 and 6 with Example 1, it can be seen that whether the spunbonded nonwoven fabric prepared from PE is used alone as the raw material (Comparative Example 5) or the spunbonded nonwoven fabric prepared from PP is used alone as the raw material (i.e., Comparative Example 6), the MD strength and CD strength of the hot air nonwoven fabric produced will be reduced to varying degrees. It can be seen that only when a two-component spunbonded nonwoven fabric made of PE and PP is used as the raw material can a high-strength hot air nonwoven fabric be produced.

[0109] The preparation steps of Comparative Example 7 (conventional hot air nonwoven fabric) are as follows:

[0110] Take the hot air non-woven fabric fiber web and put it on a layer of the oven mesh belt, then pass it through the unwinding mechanism and enter the hot air oven together. After being blown with hot air, 25g of hot air non-woven fabric is obtained, which is marked as DRB7.

[0111] Among them, the temperature of the hot air oven is specifically set as follows:

[0112] The oven temperature in the first chamber is 122°C and the wind pressure is 18Hz;

[0113] The oven temperature in the second chamber is 130°C and the wind pressure is 22Hz;

[0114] The oven temperature of the third chamber is 138°C and the wind pressure is 22Hz;

[0115] The oven temperature of the fourth chamber is 138°C and the wind pressure is 24Hz;

[0116] The oven temperature of the fifth chamber is 130°C and the wind pressure is 22Hz;

[0117] The machine speed of the unwinding mechanism is 105 m / min.

[0118] The hot air nonwoven fabric DRB7 was further tested and found to have an MD strength of 40N and a CD strength of 11N.

[0119] Experimental Example 1 Hot air nonwoven fabric thickness and softness test

[0120] The high-strength hot air nonwoven fabric RB1 prepared in Example 1 and the hot air nonwoven fabric DRB7 prepared in Comparative Examples 1 to 7 were respectively tested for thickness and softness, as follows:

[0121] Thickness test: Place the sample under the presser foot, make sure the sample is flat and in full contact with the presser foot, place a 125CN weight on the presser foot, apply constant pressure, the presser foot area is 2500 square millimeters, record the thickness value displayed by the digital thickness tester, accurate to 0.01mm, repeat the measurement three times for each sample, and take the average value. The specific results are shown in Table 1.

[0122] Softness test: The samples were taken and passed through a panel of 10 people to evaluate the softness of the non-woven fabric (1 point is the worst and 5 points is the best softness). The specific results are shown in Table 1.

[0123] Table 1 Thickness and softness test results list

[0124] Group Example 1 Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Comparative Example 5 Comparative Example 6 Comparative Example 7 Thickness(mm) 0.51 0.42 0.28 0.65 0.40 0.38 0.40 0.70 Softness 5 4 3 3 5 3 2 5

[0125] As can be seen from Table 1, the high-strength hot air nonwoven fabric RB1 prepared in Example 1 has a greater thickness (i.e., better fluffiness) and better softness. Compared with the high-strength hot air nonwoven fabric RB1 prepared by the method of the present invention, increasing or decreasing the proportion of the two-component spunbond nonwoven fabric, increasing or decreasing the temperature of the oven, using spunbond nonwoven fabric prepared by PE alone as a raw material or using spunbond nonwoven fabric prepared by PP alone as a raw material will all lead to varying degrees of deterioration in fluffiness and softness. Even the traditional hot air nonwoven fabric is not better in softness than the hot air nonwoven fabric RB1 prepared by the present invention, but its MD strength and CD strength are significantly deteriorated, and it is not suitable as a raw material in the field of personal hygiene products.

[0126] Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

Claims

1. A method for providing a strong hot air nonwoven fabric, characterized in that: The preparation method comprises taking a bicomponent spunbonded nonwoven fabric and a hot air nonwoven fabric web in a weight ratio of 11 to 13:12 to 14 as raw materials, and drying them by hot air to obtain the hot air nonwoven fabric.

2. The method for providing hot air nonwoven fabric with high strength according to claim 1, characterized in that: The preparation method comprises the following specific steps: Put the two-component spunbond nonwoven fabric on the hot air nonwoven fabric web to form a double-layer web; The double-layer fiber web is unwound and put into a hot air oven together, and is blown with hot air to bond the two-component spunbond and hot air nonwoven fabrics together to obtain the hot air nonwoven fabric.

3. The method for providing hot air nonwoven fabric with high strength according to claim 2, characterized in that: The hot air drying oven is divided into five drying chambers for drying.

4. The method for providing hot air nonwoven fabric with strength according to claim 3, characterized in that: The temperatures of the five oven chambers of the hot air oven are: The oven temperature of the first chamber is 120-124°C and the wind pressure is 17.5-18.5Hz; The oven temperature of the second chamber is 128-132°C and the wind pressure is 21.5-22.5Hz; The oven temperature of the third chamber is 136-140°C and the wind pressure is 21.5-22.5Hz; The oven temperature of the fourth chamber is 136-140°C and the wind pressure is 23.5-24.5Hz; The oven temperature of the fifth chamber is 128-132°C and the wind pressure is 21.5-22.5Hz.

5. The method for providing a strong hot air nonwoven fabric according to any one of claims 2 to 4, characterized in that: The unwinding speed is 95-105 m / min.

6. The method for providing a strong hot air nonwoven fabric according to any one of claims 2 to 4, characterized in that: The double-layer fiber web is formed by placing a two-component spunbond nonwoven fabric on a hot air nonwoven fabric production line, placing the hot air nonwoven fabric fiber web on a layer of a drying oven mesh belt, and placing the two-component spunbond nonwoven fabric on top of the hot air nonwoven fabric fiber web.

7. The method for providing a strong hot air nonwoven fabric according to any one of claims 1 to 4, characterized in that: In terms of weight percentage, the raw materials for making the two-component spunbonded nonwoven fabric include: 35-65% polyethylene and the remainder polypropylene.

8. The method for providing a strong hot air nonwoven fabric according to any one of claims 1 to 3, characterized in that: The preparation process of the bicomponent spunbonded nonwoven fabric is as follows: Take polyethylene and polypropylene, soften and melt them under high temperature and shear extrusion to form corresponding polymers, then filter to remove impurities, and then spin them separately to form corresponding spinning, and then spin them, and cool and solidify to form PE+PP fibers; The PE+PP fibers are stretched and thinned, and then form a fiber web under the action of web-forming suction wind; The fiber web is subjected to hot air consolidation treatment to obtain the bicomponent spunbonded nonwoven fabric.