Laminated non-woven fabric and application thereof

Abstract

The invention discloses a laminated non-woven fabric and application thereof.The laminated non-woven fabric comprises multiple melt-blown non-woven fabric layers, at least one melt-blown non-woven fabric layer is subjected to film pressing treatment to form a film material, and the remaining melt-blown non-woven fabric layer is not subjected to film pressing treatment; and the melt-blown non-woven fabric layer subjected to film pressing treatment and the melt-blown non-woven fabric layer not subjected to film pressing treatment are finally hot-pressed into a whole. The laminated non-woven fabric disclosed by the invention has high barrier property and high air permeability, and is low in material thickness and good in material comfort and softness.

Description

[0001] This application is a divisional application of the invention patent application with the application date of January 8, 2025, application number 2025100248202, and invention name “Laminated non-woven fabric, preparation method and application thereof, and online production equipment”. Technical Field

[0002] The present invention belongs to the technical field of non-woven fabrics, and specifically relates to a laminated non-woven fabric that can simultaneously have high barrier properties and high air permeability, and the application of the laminated non-woven fabric in protective materials. Background Art

[0003] Non-woven fabric, also known as nonwoven fabric, is a fabric made directly from fiber material without going through the weaving process. It is widely used in industry, agriculture, hygiene and medical fields.

[0004] Nonwoven fabrics, especially spunbond / meltblown / spunbond (SMS), possess certain barrier properties and breathability due to their inclusion of an M layer. They are widely used in medical surgical gowns, medical protective clothing, isolation suits, cleanroom suits, surgical drapes, sterile wraps, industrial dust-proof clothing, cleanroom suits, and protective clothing for liquid splashes and sprays. However, conventional SMS has limited barrier properties and, when used alone, is only suitable for low-level protective products, such as those meeting ANSI / AAMI Level 1 and Level 2, and EN 13795 standard performance levels. To achieve higher-level performance levels, such as ANSI / AAMI Level 3 and Level 4, or EN 13795, coating reinforcement or the use of multi-layer composite materials containing plastic films is required.

[0005] Barrier properties can be improved by laminating an intermediate M layer. For example, Chinese patent CN102115954B discloses a high-barrier nonwoven composite material, its manufacturing method, and dedicated equipment. This material is formed by heating and calendering a meltblown fabric to form a microfiber membrane, which is then composited with a spunbond nonwoven fabric to form a high-barrier nonwoven material. However, it has the following defects: 1. It cannot be produced because its high barrier performance is achieved by heating and calendering the meltblown cloth material to form a microfiber membrane. At the same time, the formation of the spunbond non-woven fabric requires suction under the workbench and then laying the spunbond non-woven fabric material on the workbench. However, due to the high barrier properties of the microfiber membrane formed by calendering the meltblown cloth material, its air permeability is poor, which will cause the subsequent non-woven fabric material to be unable to be laid, and the high-barrier non-woven fabric composite material claimed in the patent cannot be obtained; 2. It heats and calenders the meltblown cloth material to form a microfiber membrane to achieve high barrier properties, but the microfiber membrane formed by the meltblown cloth material alone has low strength and poor toughness. Even if the two sides of the microfiber membrane are covered with spunbond non-woven fabric and hot-pressed, the spunbond non-woven fabric can only play a protective role and cannot improve the characteristics of the microfiber membrane itself; 3. As mentioned above, heating and calendering the meltblown cloth material to form a microfiber membrane improves the barrier properties, but the air permeability is greatly reduced.

[0006] The disclosure of the above background technology content is only used to assist in understanding the inventive concept and technical solution of the present invention. It does not necessarily belong to the prior art of this patent application. In the absence of clear evidence that the above content has been disclosed before the filing date of this patent application, the above background technology should not be used to evaluate the novelty and creativity of this application. Summary of the Invention

[0007] In view of this, in order to overcome the defects of the prior art, one of the objects of the present invention is to provide a laminated non-woven fabric that can simultaneously achieve better high barrier properties and high air permeability.

[0008] In order to achieve the above object, the present invention adopts the following technical solutions:

[0009] A laminated nonwoven fabric adopts a multi-layer M (meltblown nonwoven fabric) design, wherein a portion of the M layers (at least one layer) are laminated, while the remaining M layers (at least one layer) are not laminated. The laminated M layers and the non-laminated M layers are finally hot-rolled to form a whole. Specifically, the laminated nonwoven fabric includes at least one film formed by laminating a first spunbond nonwoven fabric and a first meltblown nonwoven fabric, at least one second spunbond nonwoven fabric layer, and / or at least one second meltblown nonwoven fabric layer. The film and the second meltblown nonwoven fabric are hot-pressed to form the laminated nonwoven fabric.

[0010] Preferably, the laminated nonwoven fabric comprises at least one layer of a second meltblown nonwoven fabric covering the membrane material.

[0011] More preferably, the laminated non-woven fabric includes at least one layer of a second spunbond non-woven fabric covering a second meltblown non-woven fabric, and the membrane material, the second spunbond non-woven fabric and the second meltblown non-woven fabric are formed into the laminated non-woven fabric by hot pressing, and the second spunbond non-woven fabric covers the side of the second meltblown non-woven fabric away from the membrane material.

[0012] According to some preferred embodiments of the present invention, the laminated non-woven fabric has a gram weight of 30-70 gsm; a longitudinal tensile strength of 80-140 N / 5 cm, a transverse tensile strength of 30-70 N / 5 cm, a hydrostatic pressure resistance of 95-135 cmH2O, an air permeability of 35-50 cfm, a longitudinal softness of 90-170 g, and a transverse softness of 25-65 g.

[0013] Preferably, the laminated non-woven fabric has a gram weight of 35-61 gsm; a longitudinal tensile strength of 81-136 N / 5 cm, a transverse tensile strength of 35-62 N / 5 cm, a hydrostatic pressure resistance of 100-132 cmH2O, an air permeability of 35-46 cfm, a longitudinal softness of 92-167 g, and a transverse softness of 29-62 g.

[0014] More preferably, the total mass ratio of the first meltblown nonwoven fabric in the membrane material to the total mass ratio of the second meltblown nonwoven fabric outside the membrane material is 1-1.1: 1. In some embodiments, the total mass ratio of the first meltblown nonwoven fabric in the membrane material to the total mass ratio of the second meltblown nonwoven fabric outside the membrane material is preferably 1:1.

[0015] In some embodiments, the film material preferably comprises multiple layers of the first meltblown non-woven fabric, and the mass of each layer of the first meltblown non-woven fabric is equal.

[0016] In some embodiments, the mass ratio of the first meltblown nonwoven fabric to the first spunbond nonwoven fabric is preferably 1:1.8-3.0; the mass ratio of the second meltblown nonwoven fabric to the second spunbond nonwoven fabric is 1:2.5-6.0; and the mass ratio of the meltblown nonwoven fabric to the spunbond nonwoven fabric in the laminated nonwoven fabric is 1:2.5-6.

[0017] According to some preferred embodiments of the present invention, the gram weight of the first spunbond nonwoven fabric and / or the second spunbond nonwoven fabric is 10-15 gsm; the gram weight of the first meltblown nonwoven fabric and / or the second meltblown nonwoven fabric is 2-5 gsm.

[0018] Preferably, the gram weight of the first spunbond non-woven fabric and / or the second spunbond non-woven fabric is 12-14 gsm; the gram weight of the first meltblown non-woven fabric and / or the second meltblown non-woven fabric is 2.25-4.5 gsm.

[0019] According to some preferred embodiments of the present invention, the parameters of the first spunbond nonwoven fabric and the second spunbond nonwoven fabric are the same or different; and / or the parameters of the first meltblown nonwoven fabric and the second meltblown nonwoven fabric are the same or different.

[0020] According to some preferred embodiments of the present invention, the membrane has at least one layer of a third spunbond nonwoven fabric and / or at least one layer of a third meltblown nonwoven fabric on a side away from the second spunbond nonwoven fabric and / or the second meltblown nonwoven fabric.

[0021] According to some preferred embodiments of the present invention, the third spunbond non-woven fabric has a gram weight of 10-15 gsm; the third meltblown non-woven fabric has a gram weight of 2-5 gsm.

[0022] According to some preferred embodiments of the present invention, the parameters of the first spunbond non-woven fabric, the second spunbond non-woven fabric, and the third spunbond non-woven fabric are the same or different; and / or the parameters of the first meltblown non-woven fabric, the second meltblown non-woven fabric, and the third meltblown non-woven fabric are the same or different.

[0023] In some preferred embodiments of the present invention, the structure of the laminated non-woven fabric is specifically preferably as follows: FMS, FMSS, SFMS, SFMSS; wherein F represents a film material formed by pressing at least one layer of a first spunbond non-woven fabric and at least one layer of a first meltblown non-woven fabric, S represents a spunbond non-woven fabric, and M represents a meltblown non-woven fabric.

[0024] A second object of the present invention is to provide a method for preparing the laminated nonwoven fabric as described above, comprising the following steps:

[0025] forming a first spunbond nonwoven fabric and a first meltblown nonwoven fabric respectively;

[0026] Laminating the first spunbond nonwoven fabric and the first meltblown nonwoven fabric to form a film material;

[0027] forming a second meltblown nonwoven fabric;

[0028] The second meltblown nonwoven fabric and the film material are hot-pressed to form the laminated nonwoven fabric.

[0029] According to some preferred embodiments of the present invention, lamination is performed using two opposing smooth rollers. Preferably, the first lamination roller is positioned above the second lamination roller and is a smooth metal roller with pressure compensation to ensure uniform linear pressure. The second lamination roller is a smooth rubber roller. Lamination parameters are: first lamination roller temperature of 135-145°C, second lamination roller temperature of 135-145°C, and linear pressure of 25-35 N / mm.

[0030] According to some preferred embodiments of the present invention, the hot pressing is performed using two rollers positioned opposite each other, one of which is a patterned roller and the other is a smooth roller. The hot pressing parameters are: a temperature of 145-150°C for the patterned roller, a temperature of 140-145°C for the smooth roller, and a linear pressure of 70-80 N / mm.

[0031] According to some preferred embodiments of the present invention, a second spunbond nonwoven fabric is formed at the same time as the second meltblown nonwoven fabric is formed, and the film material, the second spunbond nonwoven fabric and the second meltblown nonwoven fabric are hot-pressed to form the laminated nonwoven fabric.

[0032] According to some preferred embodiments of the present invention, the steps include: forming a third spunbond nonwoven fabric and / or a third meltblown nonwoven fabric, and the membrane material is located between the third spunbond nonwoven fabric and / or the third meltblown nonwoven fabric and the second spunbond nonwoven fabric and / or the second meltblown nonwoven fabric.

[0033] A third object of the present invention is to provide a use of the laminated nonwoven fabric as described above in protective materials such as protective clothing, surgical gowns, isolation gowns, scrub suits, bed sheets, etc.

[0034] The third object of the present invention is to provide an online production equipment for the laminated non-woven fabric as described above, comprising a first web-forming machine, a second web-forming machine and a hot rolling device, wherein the second web-forming machine is arranged between the first web-forming machine and the hot rolling device; the first web-forming machine comprises a first mesh curtain, a first spunbond non-woven fabric forming device, a first meltblown non-woven fabric forming device and a film pressing device, and the second web-forming machine comprises a second meltblown non-woven fabric forming device, a second spunbond non-woven fabric forming device and a second mesh curtain; the film pressing device is used to press the first spunbond non-woven fabric formed by the first spunbond non-woven fabric forming device and the first meltblown non-woven fabric formed by the first meltblown non-woven fabric forming device into a film material, and the hot rolling device is used to hot-press the second meltblown non-woven fabric formed by the second meltblown non-woven fabric forming device and the second spunbond non-woven fabric formed by the second spunbond non-woven fabric forming device with the film material to form the laminated non-woven fabric.

[0035] According to some preferred embodiments of the present invention, the lamination device includes a first lamination roller, a second lamination roller, a first guide roller, and a second guide roller. The first guide roller is used to guide the first spunbond nonwoven fabric and the first meltblown nonwoven fabric from the first mesh curtain between the first lamination roller and the second lamination roller for lamination. The second guide roller is used to guide the film formed by lamination between the first and second lamination rollers onto the first mesh curtain. Preferably, the first lamination roller is located above the second lamination roller, and the first lamination roller is a metal smooth roller with pressure compensation to ensure uniform linear pressure; the second lamination roller is a rubber smooth roller.

[0036] According to some preferred embodiments of the present invention, the lamination device includes a cooling roller located between the first lamination roller or the second lamination roller and the second guide roller.

[0037] According to some preferred embodiments of the present invention, the transmission directions of the first net curtain and the second net curtain are the same or opposite.

[0038] According to some preferred embodiments of the present invention, a third web-forming machine is included, the third web-forming machine including a third spunbond nonwoven fabric forming device and / or a third meltblown nonwoven fabric forming device, and a third web curtain; the first web curtain and the second web curtain have the same transmission direction, which is opposite to the transmission direction of the third web curtain. That is, when only the first web curtain and the second web curtain are provided, the transmission directions of the first web curtain and the second web curtain are preferably opposite to each other; when the third web curtain is also provided, the transmission directions of the first web curtain and the second web curtain are preferably the same, which is opposite to the transmission direction of the third web curtain.

[0039] According to some preferred embodiments of the present invention, each spunbond nonwoven fabric forming device includes a spunbond spinning module located above the mesh curtain, a spunbond suction module located below the mesh curtain, and a pre-pressing roller, wherein the spunbond spinning module and the spunbond suction module are located in the same vertical direction; the pre-pressing roller is used to pre-press the spunbond nonwoven fabric on the mesh curtain.

[0040] According to some preferred embodiments of the present invention, each meltblown nonwoven fabric forming device includes a meltblown spinning module located above the mesh curtain and a meltblown suction module located below the mesh curtain, and the meltblown spinning module and the meltblown suction module are located in the same vertical direction.

[0041] The net curtain is provided with a channel communicating with the upper part and the lower part of the net curtain, so that the fibers from the spinning module above the net curtain are deposited on the net curtain through the suction module below the net curtain to form a fiber web.

[0042] Due to the adoption of the above technical solution, compared with the existing technology, the benefit of the present invention is that: the laminated non-woven fabric of the present invention is formed by directly hot-pressing the first spunbond non-woven fabric and the first meltblown non-woven fabric into a film material, and then hot-pressing with the second meltblown non-woven fabric and the second spunbond non-woven fabric to form a laminated non-woven fabric, so that the final product has high barrier properties and high air permeability, and the material thickness is low, and the material is comfortable and soft. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0044] Figure 1 Schematic diagram of the cross-sectional structure of the laminated nonwoven fabric in Example 3 of the present invention;

[0045] Figure 2 Schematic diagram of the cross-sectional structure of the laminated nonwoven fabric in Example 4 of the present invention;

[0046] Figure 3 Schematic diagram of the cross-sectional structure of the laminated nonwoven fabric in Example 5 of the present invention;

[0047] Figure 4 Schematic diagram of the cross-sectional structure of the laminated nonwoven fabric in Example 6 of the present invention;

[0048] Figure 5 Schematic diagram of the cross-sectional structure of the laminated nonwoven fabric in Example 7 of the present invention;

[0049] Figure 6 Schematic diagram of the cross-sectional structure of the laminated nonwoven fabric in Example 8 of the present invention;

[0050] Figure 7 Schematic diagram of the structure of the online production equipment in the preferred embodiment of the present invention;

[0051] Figure 8 Schematic diagram of the structure of an online production device in another preferred embodiment of the present invention;

[0052] In the accompanying drawings, online production equipment-1, the first web forming machine-21, the second web forming machine-22, the third web forming machine-23, the hot rolling device-3, the roller-31, the roller-32, the first web curtain-41, the second web curtain-42, the third web curtain-43, the first spunbond non-woven fabric forming device-51, the second spunbond non-woven fabric forming device-52, the third spunbond non-woven fabric forming device-53, the first meltblown non-woven fabric forming device-61, the second meltblown non-woven fabric forming device-62, the film pressing device-7, the first film pressing roller-71, the second film pressing roller-72, the first guide roller-73, the second guide roller-74, the cooling roller-75, the spunbond spinning module-81, the spunbond suction module-82, the pre-pressing roller-83, the meltblown spinning module-91, the meltblown suction module-92, the guide roller-10, and the support roller-11. DETAILED DESCRIPTION

[0053] In order to enable those skilled in the art to better understand the technical solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0054] The present invention adopts a multi-layer M (meltblown nonwoven fabric) design, in which a portion of the M layer is laminated and the remaining M layer is not laminated. The laminated M and the non-laminated M are finally hot-rolled to form a whole, achieving high barrier and high air permeability. It has the following advantages:

[0055] 1. Under the premise of producing the same melt-blown weight, the multi-layer design makes the extrusion volume of each layer of M smaller than that of the single-layer design. The smaller the extrusion volume, the easier it is to obtain finer melt-blown fibers, making the barrier properties of the final product better.

[0056] 2. In a single-layer design, if defects such as uneven web laying, holes, or meltblown fiber penetration occur in individual areas during the spinning and laying process, their resistance to hydrostatic pressure will be seriously affected. A multi-layer design can effectively avoid these defects (the more layers, the more uniform the material. Even if one layer has defects such as uneven web laying, holes, or meltblown fiber penetration in individual areas, the probability of defects in other layers corresponding to these locations is very low, thus reducing the impact of single-layer defects on hydrostatic pressure resistance). This makes it easier to obtain a more uniform material with fewer defects, while also improving barrier properties and enhancing softness.

[0057] 3. It adopts a multi-layer M design, with part of the M being laminated and the remaining M layers not being laminated. It can achieve barrier properties equivalent to or better than a single-layer M laminate. At the same time, it has better air permeability and more flexible adjustment than a single-layer laminated M.

[0058] 4. Simultaneously laminating at least one layer of M and S can not only effectively improve the barrier properties and air permeability, but also improve the strength and toughness of the film material and the final product.

[0059] The laminated nonwoven fabric of the present invention comprises at least one film material formed by laminating a first layer of spunbond nonwoven fabric and a first layer of meltblown nonwoven fabric, at least one layer of a second spunbond nonwoven fabric and / or at least one layer of a second meltblown nonwoven fabric, and the film material and the second spunbond nonwoven fabric and / or the second meltblown nonwoven fabric are formed into a laminated nonwoven fabric by hot pressing.

[0060] Preferably, the laminated nonwoven fabric comprises at least one layer of a second meltblown nonwoven fabric covering the membrane. More preferably, the laminated nonwoven fabric comprises at least one layer of a second spunbond nonwoven fabric covering the second meltblown nonwoven fabric, and the membrane, the second spunbond nonwoven fabric, and the second meltblown nonwoven fabric are hot-pressed to form the laminated nonwoven fabric.

[0061] Preferably, the side of the laminated nonwoven film away from the second spunbond nonwoven and / or the second meltblown nonwoven has at least one layer of a third spunbond nonwoven and / or at least one layer of a third meltblown nonwoven.

[0062] More preferably, the specific structure of the laminated non-woven fabric is as follows: FM'S', FM'S'S', S"FM'S', S"FM'S'S'; wherein F represents a film material, S' represents a second spunbond non-woven fabric, M' represents a second meltblown non-woven fabric, and S" represents a third spunbond non-woven fabric. Specifically, F may preferably be formed by laminating SM or SMM, S represents a first spunbond non-woven fabric, and M represents a first meltblown non-woven fabric.

[0063] The specific structures of the preferred laminated nonwoven fabrics are: F(SM)M'S', F(SM)M'S'S', F(SMM)M'S'S', S"F(SM)M'S', S"F(SM)M'S'S', S"F(SMM)M'S'S', S"F(SMMM)M'S'S', most preferably F(SM)M'S'S' or S"F(SM)M'S'S'.

[0064] The prepared laminated non-woven fabric has a gram weight of 30-70gsm; a longitudinal tensile strength of 80-140N / 5cm, a transverse tensile strength of 30-70N / 5cm, a hydrostatic pressure resistance of 95-135cmH2O, an air permeability of 35-50cfm, a longitudinal softness of 90-170g, and a transverse softness of 25-65g.

[0065] The first spunbond nonwoven fabric and / or the second spunbond nonwoven fabric and / or the third spunbond nonwoven fabric have a grammage of 10-15 gsm; the first meltblown nonwoven fabric and / or the second meltblown nonwoven fabric and / or the third meltblown nonwoven fabric have a grammage of 2-5 gsm. The total mass ratio of the first meltblown nonwoven fabric within the membrane to the total mass ratio of the second meltblown nonwoven fabric outside the membrane is 1-1.1:1. Preferably, the membrane comprises multiple layers of the first meltblown nonwoven fabric, each layer having equal mass; and the total mass ratio of the first meltblown nonwoven fabric within the membrane to the total mass ratio of the second meltblown nonwoven fabric outside the membrane is 1:1.

[0066] Preferably, the mass ratio between the first meltblown nonwoven fabric and the first spunbond nonwoven fabric is 1:1.8-3.0; the mass ratio between the second meltblown nonwoven fabric and the second spunbond nonwoven fabric is 1:2.5-6.0; and the mass ratio between the meltblown nonwoven fabric and the spunbond nonwoven fabric in the laminated nonwoven fabric is 1:2.5-6.

[0067] The parameters of the first spunbond non-woven fabric, the second spunbond non-woven fabric, and the third spunbond non-woven fabric are the same or different; and / or the parameters of the first meltblown non-woven fabric, the second meltblown non-woven fabric, and the third meltblown non-woven fabric are the same or different.

[0068] The present invention also provides a method for preparing the laminated non-woven fabric, comprising the following steps:

[0069] forming a first spunbond nonwoven fabric and a first meltblown nonwoven fabric respectively;

[0070] Laminating the first spunbond nonwoven fabric and the first meltblown nonwoven fabric to form a film material;

[0071] forming a second spunbond nonwoven fabric and / or a second meltblown nonwoven fabric;

[0072] The second spunbond nonwoven fabric and / or the second meltblown nonwoven fabric and the membrane material are hot-pressed to form a laminated nonwoven fabric.

[0073] Lamination is performed using two opposing smooth rollers. Preferably, the first roller is positioned above the second roller. The first roller is a smooth metal roller with pressure compensation to ensure uniform linear pressure. The second roller is a smooth rubber roller. Lamination parameters are: first roller temperature 135-145°C, second roller temperature 135-145°C, and linear pressure 25-35 N / mm.

[0074] Hot pressing is performed using two rollers placed opposite each other, one of which is a patterned roller and the other is a smooth roller. The parameters for hot pressing are: the temperature of the patterned roller is 145-150℃, the temperature of the smooth roller is 140-145℃, and the linear pressure is 70-80N / mm.

[0075] Preferably, the preparation method of the laminated nonwoven fabric is:

[0076] 1) The first S layer and the first M layer pass through the first mesh curtain and enter the film pressing device, and are subjected to high temperature and high pressure to form a high-barrier film material.

[0077] 2) at least one second S' layer and a second M' layer are pre-pressed by a pre-pressing roller through a second mesh curtain and then covered on the barrier film material;

[0078] 3) The high barrier film material, the second S' layer and the second M' layer are conveyed into the hot rolling device through the first mesh curtain and reinforced under high temperature and high pressure to form a laminated nonwoven fabric of a high barrier film material / nonwoven fabric composite material.

[0079] Preferably, the step further includes: forming a third spunbond nonwoven fabric and / or a third meltblown nonwoven fabric, and the membrane material is located between the third spunbond nonwoven fabric and / or the third meltblown nonwoven fabric and the second spunbond nonwoven fabric and / or the second meltblown nonwoven fabric.

[0080] Example 1 Online production equipment 1

[0081] like Figure 2 and Figure 7As shown, the following describes an online production apparatus 1 for laminated nonwoven fabrics using F(SM)M'S'S' as an example. The apparatus 1 includes a first web-forming machine 21, a second web-forming machine 22, and a hot-calendering device 3. The second web-forming machine 22 is disposed between the first web-forming machine 21 and the hot-calendering device 3. The first web-forming machine 21 includes a first web curtain 41, a first spunbond nonwoven fabric forming device 51, a first meltblown nonwoven fabric forming device 61, and a laminating device 7. The second web-forming machine 22 includes a second spunbond nonwoven fabric forming device 52, a second meltblown nonwoven fabric forming device 62, and a second web curtain 42. The second web-forming machine 22 is disposed above the first web curtain 41, and the first and second web curtains 41, 42 have opposite transmission directions.

[0082] The hot pressing device 3 is used to hot press the second spunbond nonwoven fabric formed by the second spunbond nonwoven fabric forming device 52 and the second meltblown nonwoven fabric formed by the second meltblown nonwoven fabric forming device 62 with the film material to form a laminated nonwoven fabric. The hot pressing device 3 includes two rollers (31, 32) arranged opposite to each other to achieve hot pressing, one of which is a patterned roller and the other is a smooth roller. The hot pressing parameters are: the temperature of the patterned roller is 145-150°C, the temperature of the smooth roller is 140-145°C, and the linear pressure is 70-80N / mm.

[0083] The laminating device 7 is used to press the first spunbond nonwoven fabric formed by the first spunbond nonwoven fabric forming device 51 and the first meltblown nonwoven fabric formed by the first meltblown nonwoven fabric forming device 61 into a film material.

[0084] The lamination device 7 includes a first lamination roller 71, a second lamination roller 72, a first guide roller 73, a second guide roller 74, and a cooling roller 75 located between the first lamination roller 71 or the second lamination roller 72 and the second guide roller 74. The first guide roller 73 is used to guide the first spunbond nonwoven fabric and the first meltblown nonwoven fabric from the first mesh screen 41 between the first lamination roller 71 and the second lamination roller 72 for lamination. The second guide roller 74 is used to guide the film formed by the first and second lamination rollers 71 and 72 onto the first mesh screen 41. Preferably, the first lamination roller 71 is located above the second lamination roller 72 and is a smooth metal roller with pressure compensation to ensure uniform linear pressure. The second lamination roller 72 is a smooth rubber roller. Lamination parameters are: temperature of the first lamination roller 71 is 135-145°C, temperature of the second lamination roller 72 is 135-145°C, and linear pressure is 25-35 N / mm.

[0085] In this embodiment, a guide roller 10 is further provided between the second web-forming machine 22 and the hot-calendering device 3 to guide the second spunbond nonwoven fabric and the second meltblown nonwoven fabric formed on the second web-forming machine 22 onto the film material of the first web-forming machine 21 so that they can subsequently enter the hot-calendering device 3 for hot-calendering. In this embodiment, a support roller 11 is provided below each of the first guide roller 73, the second guide roller 74, and the guide roller 10.

[0086] like Figure 8 As shown, if a third spunbond nonwoven fabric and / or a third meltblown nonwoven fabric needs to be covered on the side of the membrane away from the second meltblown nonwoven fabric, the online production equipment 1 also needs to include a third web-forming machine 23, which includes a third spunbond nonwoven fabric forming device 53 and / or a third meltblown nonwoven fabric forming device, and a third mesh curtain 43. In this case, the first mesh curtain 41 and the second mesh curtain 42 have the same transmission direction, which is opposite to the transmission direction of the third mesh curtain 43. At the same time, the first web-forming machine 21 and the second web-forming machine 22 are located at the same height and both are located above the third mesh curtain 43, so that the membrane material is covered on the third spunbond nonwoven fabric and / or the third meltblown nonwoven fabric, and the second spunbond nonwoven fabric and the second meltblown nonwoven fabric are covered on the membrane material, and then enter the hot rolling device 3 together for hot rolling.

[0087] Each spunbond nonwoven fabric forming device includes a spunbond spinning module 81 located above the mesh curtain, a spunbond suction module 82 located below the mesh curtain, and a pre-pressing roller 83. The spunbond spinning module 81 and the spunbond suction module 82 are located in the same vertical direction. The pre-pressing roller 83 is used to pre-press the spunbond nonwoven fabric on the mesh curtain.

[0088] Each melt-blown nonwoven fabric forming device includes a melt-blown spinning module 91 located above the mesh curtain and a melt-blown suction module 92 located below the mesh curtain. The melt-blown spinning module 91 and the melt-blown suction module 92 are located in the same vertical direction.

[0089] Example 2 Preparation method

[0090] like Figure 2 and Figure 7 As shown, the following steps for preparing laminated nonwoven fabrics are described using F(SM)M'S'S' as an example:

[0091] Step 1: Prepare the first S layer

[0092] The fibers formed by the spunbond nonwoven fabric forming device 51 are sucked by the spunbond suction module 82, and are laid on the first mesh curtain 41 of the first web forming machine 21 to complete the web laying and form the first S layer. After the fiber web passes through the pre-pressing roller 83, it is transported forward by the first mesh curtain 41 of the first web forming machine 21. Figure 7 As shown by the arrow direction on the first net curtain 41.

[0093] Step 2: Prepare the first M layer

[0094] The meltblown ultrafine fibers formed by the meltblown spinning module 91 are sucked by the meltblown suction module 92 through the first meltblown nonwoven fabric forming device 61 and laid on the first S layer fiber web conveyed by the first mesh curtain 41 of the first web forming machine 21 to form the first M layer. The web laying is completed to form a composite fiber web SM, which is conveyed forward by the first mesh curtain 41 of the first web forming machine 21. Figure 7As shown by the arrow direction on the first net curtain 41.

[0095] Step 3: Preparation of membrane material

[0096] The SM composite fiber web is conveyed from the first mesh curtain 41 to the laminating device 7 via the first guide roller 73, and is formed into a high-barrier film material (abbreviated as F) under high temperature and high pressure. After being cooled by the cooling roller 75, the web is re-laid on the first mesh curtain 41 via the second guide roller 74, and is conveyed forward by the first mesh curtain 41 of the first web forming machine 21. Figure 7 As shown by the arrow direction on the first net curtain 41.

[0097] Step 4: Prepare the second S' layer

[0098] The fibers formed by the spunbond spinning module 81 are laid on the second mesh curtain 42 of the second web forming machine 22 after being sucked by the spunbond suction module 82 through the second spunbond nonwoven fabric forming device 52, completing the web laying and forming the second S' layer. After the fiber web passes through the pre-pressing roller 83, it is transported forward by the second mesh curtain 42 of the second web forming machine 22, as shown in FIG. Figure 7 As shown by the arrow direction on the second net curtain 42.

[0099] Step 5: Prepare another second S' layer

[0100] Similar to step 4 above, another second S' layer is formed on the second S' layer to form an S'S' composite fiber web, which is then transported forward by the second mesh curtain 42 of the second web forming machine 22. Figure 7 As shown by the arrow direction on the second net curtain 42. That is, the second S' layer in this embodiment has two layers.

[0101] Step 6: Prepare the second M' layer

[0102] The meltblown ultrafine fibers formed by the meltblown spinning module 91 are formed by the second meltblown nonwoven fabric forming device 62 and sucked by the meltblown suction module 92, and are laid on the S'S' composite fiber web conveyed by the second mesh curtain 42 of the second web forming machine 22 to form a second M' layer, and the web laying is completed to form a S'S'M' composite fiber web, which is conveyed forward by the second mesh curtain 42 of the second web forming machine 22. Figure 7 As shown by the arrow direction on the second net curtain 42.

[0103] Step 7: Forming multi-layer laminated non-woven fabric

[0104] The composite fiber web of S'S'M' is conveyed by the second mesh curtain 42 of the second web-forming machine 22 to the top of the first mesh curtain 41 of the first web-forming machine 21. After passing through guide rollers 10, it is covered with the membrane material formed in step 3, forming a composite structure of FM'S'S' from bottom to top. The composite fiber web, conveyed from the first mesh curtain 41 of the first web-forming machine 21, enters the hot calendering device 3, where it is consolidated under high temperature and high pressure to form a high-barrier, highly breathable, multi-layer laminated nonwoven fabric.

[0105] Example 3F(SM)M'S'

[0106] like Figure 1 As shown, the laminated nonwoven fabric in this embodiment includes, from bottom to top, a film material formed by laminating a first spunbond nonwoven fabric S and a first meltblown nonwoven fabric M, a second meltblown nonwoven fabric M', and a second spunbond nonwoven fabric S'. The parameters (gram weight) of each layer are as follows:

[0107] S M M’ S’ 13gsm 4.5gsm 4.5gsm 13gsm

[0108] The laminated nonwoven fabric in this example was produced using the online production equipment described in Example 1 and the method described in Reference Example 2. The lamination parameters during production were: a first lamination roller temperature of 135°C, a second lamination roller temperature of 140°C, and a linear pressure of 30 N / mm. The hot pressing parameters were: a pattern roller temperature of 145°C, a smooth roller temperature of 140°C, and a linear pressure of 75 N / mm. The parameters of the resulting laminated nonwoven fabric are shown in Table 1.

[0109] Example 4F(SM)M'S'S'

[0110] like Figure 2 As shown, the laminated nonwoven fabric in this embodiment includes, from bottom to top, a film material formed by laminating a first spunbond nonwoven fabric S and a first meltblown nonwoven fabric M, a second meltblown nonwoven fabric M', a second spunbond nonwoven fabric S1', and another second spunbond nonwoven fabric S2'. The parameters (gram weight) of each layer are as follows:

[0111] S M M’ S1’ S2’ 13gsm 4.5gsm 4.5gsm 13gsm 13gsm

[0112] The laminated nonwoven fabric in this example was produced using the online production equipment described in Example 1 and the method described in Example 2. The lamination parameters during production were: first lamination roller temperature of 145°C, second lamination roller temperature of 145°C, and linear pressure of 25 N / mm. The hot pressing parameters were: pattern roller temperature of 145°C, smooth roller temperature of 145°C, and linear pressure of 70 N / mm. The parameters of the resulting laminated nonwoven fabric are shown in Table 1.

[0113] Example 5F(SMM)M'S'S'

[0114] like Figure 3 As shown, the laminated nonwoven fabric in this embodiment includes, from bottom to top, a film material formed by laminating a first spunbond nonwoven fabric S, a first meltblown nonwoven fabric M1, and another first meltblown nonwoven fabric M2, a second meltblown nonwoven fabric M', a second spunbond nonwoven fabric S1', and another second spunbond nonwoven fabric S2'. The parameters (gram weight) of each layer are as follows:

[0115] S M1 M2 M’ S1’ S2’ 13gsm 2.25gsm 2.25gsm 4.5gsm 13gsm 13gsm

[0116] The laminated nonwoven fabric in this example was produced using the online production equipment described in Example 1 and the method described in Reference Example 2. The lamination parameters during production were: a first lamination roller temperature of 135°C, a second lamination roller temperature of 145°C, and a linear pressure of 35 N / mm. The hot pressing parameters were: a pattern roller temperature of 150°C, a smooth roller temperature of 140°C, and a linear pressure of 80 N / mm. The parameters of the resulting laminated nonwoven fabric are shown in Table 1.

[0117] Example 6S"F(SM)M'S'

[0118] like Figure 4 As shown, the laminated non-woven fabric in this embodiment includes, from bottom to top, a layer of a third spunbond non-woven fabric S", a film material formed by laminating a layer of a first spunbond non-woven fabric S and a layer of a first meltblown non-woven fabric M, a layer of a second meltblown non-woven fabric M', and a layer of a second spunbond non-woven fabric S'. The parameters (gram weight) of each layer are as follows:

[0119] S” S M M’ S’ 13gsm 13gsm 4.5gsm 4.5gsm 13gsm

[0120] The laminated nonwoven fabric in this example was produced using the online production equipment described in Example 1 and the method described in Reference Example 2. The lamination parameters during production were: a first lamination roller temperature of 145°C, a second lamination roller temperature of 135°C, and a linear pressure of 30 N / mm. The hot pressing parameters were: a pattern roller temperature of 150°C, a smooth roller temperature of 145°C, and a linear pressure of 75 N / mm. The parameters of the resulting laminated nonwoven fabric are shown in Table 1.

[0121] Example 7S"F(SM)M'S'S'

[0122] like Figure 5 As shown, the laminated non-woven fabric in this embodiment includes, from bottom to top, a layer of a third spunbond non-woven fabric S", a film material formed by laminating a layer of a first spunbond non-woven fabric S and a layer of a first meltblown non-woven fabric M, a layer of a second meltblown non-woven fabric M', a layer of a second spunbond non-woven fabric S1', and another layer of a second spunbond non-woven fabric S2'. The parameters (gram weight) of each layer are as follows:

[0123] S” S M M’ S1’ S2’ 13gsm 13gsm 4.5gsm 4.5gsm 13gsm 13gsm

[0124] The laminated nonwoven fabric in this example was produced using the online production equipment described in Example 1 and the method described in Reference Example 2. The lamination parameters during production were: a first lamination roller temperature of 140°C, a second lamination roller temperature of 135°C, and a linear pressure of 35 N / mm. The hot pressing parameters were: a pattern roller temperature of 145°C, a smooth roller temperature of 140°C, and a linear pressure of 70 N / mm. The parameters of the resulting laminated nonwoven fabric are shown in Table 1.

[0125] Example 8 S"F(SMM)M'S'S'

[0126] like Figure 6 As shown, the laminated non-woven fabric in this embodiment includes, from bottom to top, a layer of a third spunbond non-woven fabric S", a film material formed by laminating a layer of a first spunbond non-woven fabric S, a layer of a first meltblown non-woven fabric M1 and another layer of a first meltblown non-woven fabric M2, a layer of a second meltblown non-woven fabric M', a layer of a second spunbond non-woven fabric S1', and another layer of a second spunbond non-woven fabric S2'. The parameters (gram weight) of each layer are as follows:

[0127] S” S M1 M2 M’ S1’ S2’ 13gsm 13gsm 2.25gsm 2.25gsm 4.5gsm 13gsm 13gsm

[0128] The laminated nonwoven fabric in this example was produced using the online production equipment described in Example 1 and the method described in Reference Example 2. The lamination parameters during production were: first lamination roller temperature of 140°C, second lamination roller temperature of 140°C, and linear pressure of 25 N / mm. The hot pressing parameters were: pattern roller temperature of 150°C, smooth roller temperature of 145°C, and linear pressure of 75 N / mm. The parameters of the resulting laminated nonwoven fabric are shown in Table 1.

[0129] Example 9F (SMMM) M'S'S'

[0130] The laminated nonwoven fabric in this embodiment includes, from bottom to top, a first spunbond nonwoven fabric S, a first meltblown nonwoven fabric M1, another first meltblown nonwoven fabric M2, another first meltblown nonwoven fabric M3 formed by lamination, a second meltblown nonwoven fabric M', a second spunbond nonwoven fabric S1', and another second spunbond nonwoven fabric S2'. The parameters (gram weight) of each layer are as follows:

[0131] S M1 M2 M3 M’ S1’ S2’ 13gsm 2.25gsm 2.25gsm 2.25gsm 4.5gsm 13gsm 13gsm

[0132] The preparation method and other parameters are basically the same as those in Example 5. The parameters of the final laminated nonwoven fabric are shown in Table 1.

[0133] Comparative Example 1S"F(M)S'

[0134] The difference between this comparative example and Example 3 is that the laminated non-woven fabric in this comparative example includes, from bottom to top, a layer of a third spunbonded non-woven fabric S", a layer of a film material formed by laminating the first meltblown non-woven fabric M, and a layer of a second spunbonded non-woven fabric S', and the gram weight of the first meltblown non-woven fabric M is the same as the total gram weight of the first meltblown non-woven fabric M and the second meltblown non-woven fabric M' in Example 3. That is, the laminated non-woven fabric in this comparative example uses the first meltblown non-woven fabric M in the film material of Example 3 and the second meltblown non-woven fabric M' outside the film material to form the film material. The parameters (gram weight) of each layer are as follows:

[0135] S” M S’ 13gsm 9gsm 13gsm

[0136] The parameters of the final laminated nonwoven fabric are shown in Table 1.

[0137] Comparative Example 2

[0138] The structure of the laminated nonwoven fabric in this comparative example is essentially the same as that in Example 3, namely, from bottom to top, it comprises, in order: a first spunbond nonwoven fabric S, a first meltblown nonwoven fabric M, a second meltblown nonwoven fabric M', and a second spunbond nonwoven fabric S'. The difference is that the first spunbond nonwoven fabric S and the first meltblown nonwoven fabric M in this comparative example are not pre-laminated. Instead, all layers are directly hot-calendered in a hot-calendering device. In other words, the laminated nonwoven fabric in this comparative example is not laminated and does not contain any film-like material.

[0139] S M M’ S’ 13gsm 4.5gsm 4.5gsm 13gsm

[0140] The parameters of the final laminated nonwoven fabric are shown in Table 1.

[0141] Comparative Example 3

[0142] The difference between this comparative example and Example 4 is that in this comparative example, the laminated non-woven fabric includes, from bottom to top, a layer of first spunbond non-woven fabric S and a layer of first meltblown non-woven fabric M1, another layer of first meltblown non-woven fabric M2 formed by lamination, a layer of second spunbond non-woven fabric S1', and another layer of second spunbond non-woven fabric S2'.

[0143] That is, in this comparative example, the second meltblown nonwoven fabric in Example 4 was moved onto the first meltblown nonwoven fabric to form another layer of the first meltblown nonwoven fabric, which was then laminated together with a layer of the first spunbond nonwoven fabric and a layer of the first meltblown nonwoven fabric to form a membrane. The membrane contained two layers of meltblown nonwoven fabric, and no meltblown nonwoven fabric was present outside the membrane.

[0144] S M1 M2 S1’ S2’ 13gsm 4.5gsm 4.5gsm 13gsm 13gsm

[0145] The parameters of the final laminated nonwoven fabric are shown in Table 1.

[0146] Comparative Example 4

[0147] The difference between this comparative example and Example 4 is that: in this comparative example, the laminated nonwoven fabric includes By one A first spunbond nonwoven fabric S, a first meltblown nonwoven fabric M1, and another first meltblown nonwoven fabric are pressed together. The membrane material formed by the membrane M2, a layer of second meltblown non-woven fabric M', a layer of second spunbond non-woven fabric S1', and another layer of second spunbond non-woven fabric S2'.

[0148] That is, in this comparative example, the membrane material contains two layers of the first meltblown non-woven fabric, and the parameters of each layer of the first meltblown non-woven fabric are consistent with the first meltblown non-woven fabric in Example 4. There are two layers of meltblown non-woven fabric in the membrane material, and there is also a meltblown non-woven fabric outside the membrane material.

[0149] S M1 M2 M’ S1’ S2’ 13gsm 4.5gsm 4.5gsm 4.5gsm 13gsm 13gsm

[0150] The parameters of the final laminated nonwoven fabric are shown in Table 1.

[0151] Results and Discussion

[0152] The nonwoven fabrics obtained in the Examples and Comparative Examples were tested for tensile strength, hydrostatic pressure resistance, air permeability, and softness. The tensile strength test was based on the ASTM D5035-11 method, with a sample width of 50 mm, a fixture of 75 mm, and a speed of 30 mm / min. The hydrostatic pressure test was based on the AATCC 127 method, with a speed of 60 mbar / min. The air permeability test was based on the ASTM D737-18 method, with a test area of 38 cm. 2 , test pressure: 125Pa; softness reference test method: WSP 90.3, sample size: 200mm×200mm. The test results are shown in Table 1 below.

[0153] Table 1 Test results

[0154]

[0155] MD stands for machine direction, which is longitudinal direction; CD stands for cross direction.

[0156] The above results show that, compared with Comparative Examples 1 and 2, Example 3 has the same total mass of meltblown nonwoven fabric. In Example 3, half the weight of the meltblown nonwoven fabric is laminated with the first spunbond nonwoven fabric to form a membrane, with the other half positioned outside the membrane. This significantly improves both barrier properties and air permeability compared to Comparative Example 1, and significantly improves barrier properties while maintaining comparable air permeability compared to Comparative Example 2. This demonstrates that, while maintaining the same weight, providing more layers of meltblown nonwoven fabric can balance air permeability and barrier properties, while achieving improved performance.

[0157] Compared to Example 4, Example 5 contains two layers of the first meltblown nonwoven fabric in the membrane, and the total mass of the first meltblown nonwoven fabric in the membrane is equal to that in Example 4. The barrier properties of Example 5 are significantly improved, while the air permeability is comparable. This indicates that, while maintaining the same grammage, evenly disposing more meltblown nonwoven fabric to form a membrane can effectively improve the barrier properties while maintaining comparable air permeability. Furthermore, compared to Comparative Example 3, Examples 4 and 5 achieve significantly improved air permeability while maintaining comparable barrier properties.

[0158] Compared with Comparative Example 4, although the total mass of the first meltblown non-woven fabric in the membrane material of Example 9 is less than the total mass of the first meltblown non-woven fabric in Comparative Example 4, since the membrane material of Example 9 uses 3 layers of 2.25gsm first meltblown non-woven fabric, the barrier property of the product of Example 9 is equivalent to that of Comparative Example 4, but the air permeability is significantly improved.

[0159] The multi-layer nonwoven fabric product of the present invention utilizes a multi-layer M design, with a portion of the M layer being laminated and the remaining M layer being unlaminated. This achieves barrier properties equivalent to or superior to those of a single-layer M laminate, while also offering improved breathability and greater controllability compared to a single-layer M laminate of corresponding weight. Simultaneously laminating at least one M layer with S not only effectively improves barrier properties and breathability, but also enhances the strength and toughness of the film and the final product. This achieves superior performance at the same material weight, reduces production costs, and increases material comfort and softness.

[0160] In the single web forming method of the existing technology, the air permeability of the meltblown nonwoven fabric will theoretically be greatly reduced after the film is pressed. The spunbond nonwoven fabric laying process in the next step requires suction from the bottom of the mesh to complete the web laying. After the meltblown nonwoven fabric is pressed, the air permeability is greatly reduced, which will affect the effect of the suction from the bottom of the mesh, thereby affecting the uniformity of the spunbond nonwoven fabric laying and even making it impossible to complete the web laying. The double web forming method used in this application can avoid this problem. The second spunbond nonwoven fabric and the second meltblown nonwoven fabric are web-formed on another web-forming machine and then composited with the membrane material after the web is formed. This avoids the impact of the reduced air permeability of the membrane material after the film is pressed on the subsequent spunbond nonwoven or meltblown nonwoven web laying. At the same time, since meltblown non-woven fabric is a superfine fiber, after lamination, the barrier performance is mainly achieved by the meltblown non-woven fabric layer. Compared with the spunbond non-woven fabric layer, the meltblown non-woven fabric layer has the disadvantages of low strength and poor toughness. The use of spunbond non-woven fabric and meltblown non-woven fabric for lamination has the advantage of enhancing the strength and toughness after lamination and protecting the meltblown non-woven fabric layer. The material is more durable during subsequent processing and use.

[0161] The above-described embodiments, prepared by the methods of the present invention, are intended only to illustrate the technical concepts and features of the present invention. Their purpose is to enable those skilled in the art to understand the present invention and implement it accordingly. They are not intended to limit the scope of protection of the present invention. Any equivalent variations or modifications made in accordance with the spirit and substance of the present invention are intended to be encompassed within the scope of protection of the present invention.

Claims

1. A laminated nonwoven fabric, characterized in that: It includes multiple layers of meltblown non-woven fabric layers, at least one of which is subjected to lamination to form a film material, and the remaining meltblown non-woven fabric layers are not subjected to lamination. The meltblown non-woven fabric layers subjected to lamination and the meltblown non-woven fabric layers not subjected to lamination are finally hot-pressed to form a whole.

2. The laminated nonwoven fabric according to claim 1, wherein The membrane material formed by the lamination treatment includes at least one layer of a first spunbond non-woven fabric and a layer of a first meltblown non-woven fabric, and the meltblown non-woven fabric layer that has not been subjected to the lamination treatment includes at least one layer of a second meltblown non-woven fabric. The membrane material and the second meltblown non-woven fabric are formed into the laminated non-woven fabric by hot pressing.

3. The laminated nonwoven fabric according to claim 2, characterized in that The laminated non-woven fabric includes at least one layer of second spunbond non-woven fabric covered on a second meltblown non-woven fabric, and the membrane material, the second spunbond non-woven fabric and the second meltblown non-woven fabric are hot pressed to form the laminated non-woven fabric, and the second spunbond non-woven fabric is covered on the side of the second meltblown non-woven fabric away from the membrane material.

4. The laminated nonwoven fabric according to claim 3, characterized in that The side of the membrane away from the second spunbond non-woven fabric and / or the second meltblown non-woven fabric has at least one layer of a third spunbond non-woven fabric and / or at least one layer of a third meltblown non-woven fabric.

5. The laminated nonwoven fabric according to claim 2, characterized in that The total mass ratio of the first meltblown non-woven fabric in the membrane material to the total mass of the second meltblown non-woven fabric outside the membrane material is 1-1.1:

1.

6. The laminated nonwoven fabric according to claim 5, characterized in that The total mass ratio of the first meltblown non-woven fabric in the membrane material to the total mass of the second meltblown non-woven fabric outside the membrane material is 1:

1.

7. The laminated nonwoven fabric according to claim 1, wherein The membrane material contains multiple layers of first meltblown non-woven fabrics; each layer of the first meltblown non-woven fabrics has the same mass.

8. The laminated nonwoven fabric according to claim 2, wherein: The mass ratio of the first meltblown nonwoven fabric to the first spunbond nonwoven fabric is 1:1.8-3.0; the mass ratio of the second meltblown nonwoven fabric to the second spunbond nonwoven fabric is 1:2.5-6.0; and the mass ratio of the meltblown nonwoven fabric to the spunbond nonwoven fabric in the laminated nonwoven fabric is 1:2.5-6.

9. The laminated nonwoven fabric according to claim 4, characterized in that The first spunbond nonwoven fabric and / or the second spunbond nonwoven fabric and / or the third spunbond nonwoven fabric has a gram weight of 10-15 gsm; the first meltblown nonwoven fabric and / or the second meltblown nonwoven fabric and / or the third spunbond nonwoven fabric has a gram weight of 2-5 gsm.

10. The laminated nonwoven fabric according to claim 9, characterized in that The first spunbond nonwoven fabric and / or the second spunbond nonwoven fabric and / or the third spunbond nonwoven fabric has a gram weight of 12-14 gsm; the first meltblown nonwoven fabric and / or the second meltblown nonwoven fabric and / or the third spunbond nonwoven fabric has a gram weight of 2.25-4.5 gsm.

11. The laminated nonwoven fabric according to claim 4, characterized in that The parameters of the first spunbond non-woven fabric, the second spunbond non-woven fabric, and the third spunbond non-woven fabric are the same or different; and / or the parameters of the first meltblown non-woven fabric, the second meltblown non-woven fabric, and the third meltblown non-woven fabric are the same or different.

12. The laminated nonwoven fabric according to claim 1, wherein The laminated non-woven fabric has a gram weight of 30-70 gsm; a longitudinal tensile strength of 80-140 N / 5 cm and a transverse tensile strength of 30-70 N / 5 cm as measured according to standard ASTM D5035-11; a hydrostatic pressure resistance of 95-135 cmH2O as measured according to standard AATCC 127; an air permeability of 35-50 cfm as measured according to standard ASTM D737-18; and a longitudinal softness of 90-170 g and a transverse softness of 25-65 g as measured according to standard WSP 90.

3.

13. The laminated nonwoven fabric according to claim 1, wherein The lamination is performed by two oppositely arranged smooth rollers, the first lamination roller is located above the second lamination roller, and the first lamination roller is a metal smooth roller with pressure compensation to ensure uniform linear pressure; The second lamination roller is a rubber smooth roller.

14. The laminated nonwoven fabric according to claim 13, wherein: The lamination parameters are as follows: the temperature of the first lamination roller is 135-145° C., the temperature of the second lamination roller is 135-145° C., and the linear pressure is 25-35 N / mm.

15. The laminated nonwoven fabric according to claim 1, wherein The hot pressing is performed by using two rollers arranged opposite to each other, one of which is a patterned roller and the other is a smooth roller.

16. The laminated nonwoven fabric according to claim 15, characterized in that The parameters of the hot pressing are: the temperature of the pattern roller is 145-150° C., the temperature of the smooth roller is 140-145° C., and the linear pressure is 70-80 N / mm.

17. Use of the laminated nonwoven fabric according to any one of claims 1 to 16 in protective materials.

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