Laminated non-woven fabric, its preparation method and application, and on-line production equipment

Abstract

The present invention discloses a laminated non-woven fabric, a preparation method and application thereof, and an on-line production device. The laminated non-woven fabric comprises a film material formed by laminating at least one layer of a first spunbond non-woven fabric and one layer of a first meltblown non-woven fabric through lamination, at least one layer of a second meltblown non-woven fabric, and at least one layer of a second spunbond non-woven fabric. The film material, the second meltblown non-woven fabric and the second spunbond non-woven fabric are thermally pressed to form the laminated non-woven fabric, and the second spunbond non-woven fabric covers the side of the second meltblown non-woven fabric away from the film material. For the laminated non-woven fabric of the present invention, after directly thermally pressing the first spunbond non-woven fabric and the first meltblown non-woven fabric to form a film material and then thermally pressing the film material with the second meltblown non-woven fabric to form the laminated non-woven fabric, the final product simultaneously has high barrier property and high air permeability, and has a low material thickness, good material comfort and softness.

Description

Technical Field

[0001] The present invention belongs to the technical field of nonwoven fabrics, and specifically relates to a laminated nonwoven fabric that can simultaneously have high barrier properties and high air permeability, a preparation method of the laminated nonwoven fabric, an application of the laminated nonwoven fabric in protective materials, and an integrated online production device for the laminated nonwoven fabric. Background Art

[0002] Non-woven fabric, also known as nonwoven fabric, is a fabric made directly from fiber material without going through a weaving process. It is widely used in industry, agriculture, hygiene, and medical fields.

[0003] Non-woven fabrics, especially spunbond meltblown spunbond (SMS), have certain barrier properties and air permeability due to the M layer. They are widely used in medical surgical gowns, medical protective gowns, isolation gowns, clean gowns, surgical drapes, sterilization wraps, industrial dustproof gowns, clean gowns, liquid splash and spray protective gowns, etc. However, conventional SMS has average barrier properties and is only suitable for some low-level protective products when used alone, such as ANSI / AAMI Level 1, Level 2, and EN 13795 standard performance levels. To achieve high-level ANSI / AAMI Level 3, level 4 or EN 13795 high-performance levels, it is necessary to add coating reinforcement materials or use multi-layer composite materials containing plastic films.

[0004] The barrier property is improved by laminating the middle M layer, such as Chinese patent CN102115954B, which discloses a high-barrier non-woven composite material and its manufacturing method and special equipment. It heats and calenders the melt-blown cloth material to form an ultra-fine fiber membrane, and then compounds it with another spunbond non-woven fabric to form a high-barrier non-woven 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 superfine fiber membrane. At the same time, the formation of the spunbond non-woven fabric requires suction under the workbench and then the spunbond non-woven fabric material is laid on the workbench to form it. However, due to the high barrier property of the superfine fiber 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 lay the net, and the high barrier non-woven composite material claimed in the patent cannot be obtained; 2. It heats and calenders the meltblown cloth material to form a superfine fiber membrane to achieve high barrier properties, but the superfine fiber membrane formed by the meltblown cloth material alone has low strength and poor toughness. Even if the two sides of the superfine fiber membrane are covered with spunbond non-woven fabrics and hot-pressed, the spunbond non-woven fabric can only play a protective role and cannot improve the characteristics of the superfine fiber membrane itself; 3. As mentioned above, heating and calendering the meltblown cloth material to form a superfine fiber membrane improves the barrier properties, but the air permeability is greatly reduced.

[0005] 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 the present application. Summary of the invention

[0006] 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 nonwoven fabric that can simultaneously achieve better high barrier properties and high air permeability.

[0007] In order to achieve the above object, the present invention adopts the following technical solutions:

[0008] A laminated nonwoven fabric adopts a multi-M (meltblown nonwoven fabric) layer design, wherein a portion of the M layers (at least one layer) are subjected to lamination, and the remaining M layers (at least one layer) are not subjected to lamination, and the M layers subjected to lamination and the M layers not subjected to lamination are finally hot-rolled to form a whole. Specifically, it includes at least one film material formed by lamination of a first spunbond nonwoven fabric and a first meltblown nonwoven fabric, at least one second spunbond nonwoven fabric and / or at least one second meltblown nonwoven fabric, and the film material and the second meltblown nonwoven fabric are hot-pressed to form the laminated nonwoven fabric.

[0009] Preferably, the laminated nonwoven fabric comprises at least one layer of a second meltblown nonwoven fabric covering the membrane material.

[0010] More preferably, the laminated nonwoven fabric includes at least one layer of a second spunbond nonwoven fabric covering a second meltblown nonwoven fabric, and the membrane material, the second spunbond nonwoven fabric and the second meltblown nonwoven fabric are formed by hot pressing to form the laminated nonwoven fabric, and the second spunbond nonwoven fabric covers the side of the second meltblown nonwoven fabric away from the membrane material.

[0011] According to some preferred embodiments of the present invention, the laminated nonwoven 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, and a hydrostatic pressure resistance of 95-135 cmH 2 O, air permeability is 35-50cfm, longitudinal softness is 90-170g, and transverse softness is 25-65g.

[0012] Preferably, the laminated nonwoven 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, and a hydrostatic pressure resistance of 100-132 cmH 2 O, air permeability is 35-46cfm, longitudinal softness is 92-167g, and transverse softness is 29-62g.

[0013] 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.

[0014] 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.

[0015] 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.

[0016] According to some preferred embodiments of the present invention, the first spunbond nonwoven fabric and / or the second spunbond nonwoven fabric has a grammage of 10-15 gsm; the first meltblown nonwoven fabric and / or the second meltblown nonwoven fabric has a grammage of 2-5 gsm.

[0017] Preferably, the gram weight of the first spunbond nonwoven fabric and / or the second spunbond nonwoven fabric is 12-14 gsm; the gram weight of the first meltblown nonwoven fabric and / or the second meltblown nonwoven fabric is 2.25-4.5 gsm.

[0018] According to some preferred embodiments of the present invention, parameters of the first spunbond nonwoven fabric and the second spunbond nonwoven fabric are the same or different; and / or parameters of the first meltblown nonwoven fabric and the second meltblown nonwoven fabric are the same or different.

[0019] 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.

[0020] According to some preferred implementation aspects of the present invention, the gram weight of the third spunbond nonwoven fabric is 10-15 gsm; the gram weight of the third meltblown nonwoven fabric is 2-5 gsm.

[0021] According to some preferred embodiments of the present invention, the parameters of the first spunbond nonwoven fabric, the second spunbond nonwoven fabric, and the third spunbond nonwoven fabric are the same or different; and / or the parameters of the first meltblown nonwoven fabric, the second meltblown nonwoven fabric, and the third meltblown nonwoven fabric are the same or different.

[0022] 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 laminating 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.

[0023] The second object of the present invention is to provide a method for preparing the laminated nonwoven fabric as described above, comprising the following steps:

[0024] forming a first spunbonded nonwoven fabric and a first meltblown nonwoven fabric respectively;

[0025] Forming a film material by laminating the first spunbond nonwoven fabric and the first meltblown nonwoven fabric;

[0026] forming a second melt-blown nonwoven fabric;

[0027] The second meltblown nonwoven fabric and the film material are formed into the laminated nonwoven fabric by heat pressing.

[0028] According to some preferred implementation aspects of the present invention, the lamination is performed by two oppositely arranged smooth rollers, 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. The lamination parameters are: 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 25-35N / mm.

[0029] According to some preferred implementation aspects of the present invention, the hot pressing is performed by using two rollers arranged opposite to each other, one of which is a pattern roller and the other is a smooth roller. 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 70-80N / mm.

[0030] According to some preferred embodiments of the present invention, a second spunbond nonwoven fabric is formed while a 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.

[0031] 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.

[0032] The third object of the present invention is to provide a laminated nonwoven fabric as described above for use in protective materials such as protective clothing, surgical gowns, isolation gowns, scrub suits, bed sheets, etc.

[0033] 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.

[0034] According to some preferred implementation aspects of the present invention, the laminating device includes a first laminating roller and a second laminating roller, a first guide roller, and a second guide roller. The first guide roller is used to introduce the first spunbond nonwoven fabric and the first meltblown nonwoven fabric from the first mesh curtain into the first laminating roller and the second laminating roller for lamination. The second guide roller is used to guide the film material pressed by the first laminating roller and the second laminating roller onto the first mesh curtain. Preferably, the first laminating roller is located above the second laminating roller, and the first laminating roller is a metal smooth roller with pressure compensation to ensure uniform line pressure; the second laminating roller is a rubber smooth roller.

[0035] According to some preferred implementation aspects of the present invention, the lamination device comprises a cooling roller located between the first lamination roller or the second lamination roller and the second guide roller.

[0036] According to some preferred implementation aspects of the present invention, the transmission directions of the first net curtain and the second net curtain are the same or opposite.

[0037] According to some preferred embodiments of the present invention, a third web-forming machine is included, and the third web-forming machine includes a third spunbond nonwoven fabric forming device and / or a third meltblown nonwoven fabric forming device, and a third web curtain; the transmission direction of the first web curtain and the second web curtain is the same, and is opposite to the transmission direction of the third web curtain. That is, when there are only the first web curtain and the second web curtain, it is preferred that the transmission directions of the first web curtain and the second web curtain are opposite; when there is also a third web curtain, it is preferred that the transmission directions of the first web curtain and the second web curtain are the same, and are opposite to the transmission direction of the third web curtain.

[0038] 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.

[0039] 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.

[0040] The net curtain is provided with a passage connecting the upper part of the net curtain and the lower part of the net curtain, so that the fibers coming out of the spinning module above the net curtain can be deposited on the net curtain through the suction module below the net curtain to form a fiber net.

[0041] Due to the adoption of the above technical scheme, compared with the prior art, the advantage of the present invention is that: the laminated non-woven fabric of the present invention is formed by directly hot-pressing a first spunbond non-woven fabric and a first meltblown non-woven fabric into a film material and then hot-pressing with a second meltblown non-woven fabric and a 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 comfort and softness are good. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] 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.

[0043] Figure 1 Schematic diagram of the cross-sectional structure of the laminated nonwoven fabric in Example 3 of the present invention;

[0044] Figure 2 Schematic diagram of the cross-sectional structure of the laminated nonwoven fabric in Example 4 of the present invention;

[0045] Figure 3 Schematic diagram of the cross-sectional structure of the laminated nonwoven fabric in Example 5 of the present invention;

[0046] Figure 4 Schematic diagram of the cross-sectional structure of the laminated nonwoven fabric in Example 6 of the present invention;

[0047] Figure 5 Schematic diagram of the cross-sectional structure of the laminated nonwoven fabric in Example 7 of the present invention;

[0048] Figure 6 Schematic diagram of the cross-sectional structure of the laminated nonwoven fabric in Example 8 of the present invention;

[0049] Figure 7 It is a structural schematic diagram of an online production device in a preferred embodiment of the present invention;

[0050] Figure 8It is a structural schematic diagram of an online production device in another preferred embodiment of the present invention;

[0051] 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 mesh curtain-41, the second mesh curtain-42, the third mesh 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

[0052] In order to enable those skilled in the art to better understand the technical solution of the present invention, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the 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 creative work should fall within the scope of protection of the present invention.

[0053] The present invention adopts a multi-M (melt-blown nonwoven fabric) layer design, in which a part of the M layer is subjected to lamination, and the remaining M layer is not subjected to lamination. The M subjected to lamination and the M not subjected to lamination are finally hot-rolled to form a whole, so as to achieve high barrier and high air permeability. It has the following advantages:

[0054] 1. Under the premise of producing the same melt-blown weight, the multi-M-layer design makes the extrusion amount of each layer of M smaller than that of the single-M-layer design. The smaller the extrusion amount, the easier it is to obtain finer melt-blown fibers, making the barrier properties of the final product better.

[0055] 2. When designing a single M layer, if there are defects such as uneven web laying, holes, and melt-blown fiber breakdown in individual areas during the spinning and web laying process, it will seriously affect the resistance to hydrostatic pressure. The multi-M layer design can effectively avoid the occurrence of defects such as uneven web laying, holes, and melt-blown fiber breakdown (the more layers, the more uniform the material. Even if there are defects such as uneven web laying, holes, and melt-blown fiber breakdown in individual areas of one M layer, the probability of defects in other M layers corresponding to this position is very low, which reduces the impact of single-layer defects on resistance to hydrostatic pressure), and it is easy to obtain more uniform materials with fewer defects, while improving barrier properties and better softness.

[0056] 3. It adopts a multi-layer M design, in which a part of the M is laminated and the remaining M layers are not 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.

[0057] 4. Pressing at least one layer of M and S at the same time 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.

[0058] The laminated nonwoven fabric of the present invention comprises at least one film material formed by laminating a first spunbond nonwoven fabric and a first meltblown nonwoven fabric, at least one second spunbond nonwoven fabric and / or at least one 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.

[0059] Preferably, the laminated nonwoven fabric comprises at least one layer of a second meltblown nonwoven fabric covering the membrane material. 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 material, the second spunbond nonwoven fabric and the second meltblown nonwoven fabric are formed into the laminated nonwoven fabric by heat pressing.

[0060] 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.

[0061] More preferably, the specific structure of the laminated nonwoven 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 spunbonded nonwoven fabric, M' represents a second meltblown nonwoven fabric, and S'' represents a third spunbonded nonwoven fabric. Specifically, F may preferably be formed by laminating SM or SMM, S represents a first spunbonded nonwoven fabric, and M represents a first meltblown nonwoven fabric.

[0062] 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', and most preferably F(SM)M'S'S' or S''F(SM)M'S'S'.

[0063] The prepared laminated nonwoven fabric has a gram weight of 30-70gsm; a longitudinal tensile strength of 80-140N / 5cm, a transverse tensile strength of 30-70N / 5cm, and a hydrostatic pressure resistance of 95-135cmH 2 O, air permeability is 35-50cfm, longitudinal softness is 90-170g, and transverse softness is 25-65g.

[0064] The gram weight of the first spunbond nonwoven fabric and / or the second spunbond nonwoven fabric and / or the third spunbond nonwoven fabric is 10-15gsm; the gram weight of the first meltblown nonwoven fabric and / or the second meltblown nonwoven fabric and / or the third meltblown nonwoven fabric is 2-5gsm. 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. Preferably, the membrane material has multiple layers of the first meltblown nonwoven fabric, and the mass of each layer of the first meltblown nonwoven fabric is equal; 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.

[0065] Preferably, the mass ratio between the first meltblown nonwoven fabric and the first spunbonded nonwoven fabric is 1:1.8-3.0; the mass ratio between the second meltblown nonwoven fabric and the second spunbonded nonwoven fabric is 1:2.5-6.0; and the mass ratio between the meltblown nonwoven fabric and the spunbonded nonwoven fabric in the laminated nonwoven fabric is 1:2.5-6.

[0066] The parameters of the first spunbond nonwoven fabric, the second spunbond nonwoven fabric, and the third spunbond nonwoven fabric are the same or different; and / or the parameters of the first meltblown nonwoven fabric, the second meltblown nonwoven fabric, and the third meltblown nonwoven fabric are the same or different.

[0067] The present invention also provides a method for preparing the laminated nonwoven fabric, comprising the following steps:

[0068] forming a first spunbonded nonwoven fabric and a first meltblown nonwoven fabric respectively;

[0069] Forming a film material by laminating the first spunbond nonwoven fabric and the first meltblown nonwoven fabric;

[0070] forming a second spunbond nonwoven fabric and / or a second meltblown nonwoven fabric;

[0071] 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.

[0072] The lamination is performed by two oppositely arranged smooth rollers. 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. The lamination parameters are: the temperature of the first lamination roller is 135-145℃, the temperature of the second lamination roller is 135-145℃, and the linear pressure is 25-35N / mm.

[0073] The hot pressing is performed by using two rollers arranged opposite to each other, one of which is a pattern roller and the other is a smooth roller. The parameters of the hot pressing are: the temperature of the pattern roller is 145-150℃, the temperature of the smooth roller is 140-145℃, and the linear pressure is 70-80N / mm.

[0074] Preferably, the preparation method of the laminated nonwoven fabric is:

[0075] 1) The first S layer and the first M layer enter the film pressing device through the first mesh curtain and are made into high-barrier film materials through high temperature and high pressure.

[0076] 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;

[0077] 3) The high barrier film material and the second S' layer and the second M' layer are transported into the hot rolling device through the first mesh curtain, and reinforced under high temperature and high pressure to form a laminated non-woven fabric of a high barrier film material / non-woven fabric composite material.

[0078] Preferably, the step further includes: forming a third spunbond nonwoven fabric and / or a third meltblown nonwoven fabric, wherein 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.

[0079] Example 1 Online production equipment 1

[0080] like Figure 2 and Figure 7 As shown, the following takes F (SM) M'S'S' as an example to illustrate the online production equipment 1 of laminated non-woven fabrics, including a first web-forming machine 21, a second web-forming machine 22 and a hot rolling device 3, and the second web-forming machine 22 is arranged between the first web-forming machine 21 and the hot rolling device 3. The first web-forming machine 21 includes a first web curtain 41, a first spunbond non-woven fabric forming device 51, a first melt-blown non-woven fabric forming device 61 and a laminating device 7; the second web-forming machine 22 includes a second spunbond non-woven fabric forming device 52, a second melt-blown non-woven fabric forming device 62 and a second web curtain 42. The second web-forming machine 22 is arranged above the first web curtain 41, and the transmission directions of the first web curtain 41 and the second web curtain 42 are opposite.

[0081] The hot rolling 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 rolling device 3 includes two rollers (31, 32) arranged opposite to each other to achieve hot rolling, one of which is a pattern roller and the other is a smooth roller. The parameters of 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 70-80N / mm.

[0082] 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.

[0083] The laminating device 7 includes a first laminating roller 71 and a second laminating roller 72, a first guide roller 73, a second guide roller 74, and a cooling roller 75 located between the first laminating roller 71 or the second laminating roller 72 and the second guide roller 74. The first guide roller 73 is used to introduce the first spunbond nonwoven fabric and the first meltblown nonwoven fabric from the first mesh curtain 41 to the first laminating roller 71 and the second laminating roller 72 for lamination. The second guide roller 74 is used to guide the film material pressed by the first laminating roller 71 and the second laminating roller 72 to the first mesh curtain 41. Preferably, the first laminating roller 71 is located above the second laminating roller 72, and the first laminating roller 71 is a metal smooth roller with pressure compensation to ensure uniform linear pressure; the second laminating roller 72 is a rubber smooth roller. The laminating parameters are: the temperature of the first laminating roller 71 is 135-145°C, the temperature of the second laminating roller 72 is 135-145°C, and the linear pressure is 25-35N / mm.

[0084] In this embodiment, a guide roller 10 is further provided between the second web-forming machine 22 and the hot rolling device 3, for guiding the second spunbonded nonwoven fabric and the second meltblown nonwoven fabric formed on the second web-forming machine 22 to the film material of the first web-forming machine 21, so that they can enter the hot rolling device 3 for hot rolling later. In this embodiment, a support roller 11 is provided below the first guide roller 73, the second guide roller 74, and the guide roller 10.

[0085] like Figure 8 As shown, if it is necessary to cover the third spunbond nonwoven fabric and / or the third meltblown nonwoven fabric on the side of the membrane material away from the second meltblown nonwoven fabric, the online production equipment 1 also needs to include a third web-forming machine 23, and the third web-forming machine 23 includes a third spunbond nonwoven fabric forming device 53 and / or a third meltblown nonwoven fabric forming device, and a third mesh curtain 43. At this time, the transmission direction of the first mesh curtain 41 and the second mesh curtain 42 is the same, and 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 are both located above the third mesh curtain 43, so as to cover the membrane material on the third spunbond nonwoven fabric and / or the third meltblown nonwoven fabric, and cover the second spunbond nonwoven fabric and the second meltblown nonwoven fabric on the membrane material, and enter the hot rolling device 3 together for hot rolling.

[0086] Each spunbond nonwoven fabric forming device comprises 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.

[0087] Each melt-blown nonwoven fabric forming device comprises 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.

[0088] Example 2 Preparation method

[0089] like Figure 2 and Figure 7 As shown, the following steps of preparing laminated nonwoven fabrics are described using F (SM) M'S'S' as an example:

[0090] Step 1: Prepare the first S layer

[0091] The fibers formed by the spunbond spinning module 81 are laid on the first mesh curtain 41 of the first web-forming machine 21 through the first spunbond suction module 82 through the first spunbond nonwoven fabric forming device 51, and the web is laid to 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, as shown in FIG. Figure 7 As shown by the arrow direction on the first net curtain 41.

[0092] Step 2: Prepare the first M layer

[0093] The melt-blown ultrafine fibers formed by the melt-blown spinning module 91 are laid on the first S-layer fiber web conveyed by the first mesh curtain 41 of the first web-forming machine 21 through the first melt-blown nonwoven fabric forming device 61 and the first M-layer fiber web is formed. The web is laid to form a composite fiber web of SM, which 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.

[0094] Step 3: Preparation of membrane material

[0095] The SM composite fiber web is transported from the first mesh curtain 41 to the film pressing device 7 through the first guide roller 73, and is made into a high-barrier film material (abbreviated as F) under high temperature and high pressure. After being cooled by the cooling roller 75 and re-laid on the first mesh curtain 41 through the second guide roller 74, the SM composite fiber web is transported forward by the first mesh curtain 41 of the first web forming machine 21, as shown in FIG. Figure 7 As shown by the arrow direction on the first net curtain 41.

[0096] Step 4: Prepare the second S' layer

[0097] The fibers formed by the spunbond spinning module 81 are laid on the second mesh curtain 42 of the second web forming machine 22 through the second spunbond suction module 82 through the second spunbond nonwoven fabric forming device 52, and the web is laid to form 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.

[0098] Step 5: Prepare another second S' layer

[0099] Similar to step 4, 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.

[0100] Step 6: Prepare the second M' layer

[0101] The melt-blown ultrafine fibers formed by the melt-blown spinning module 91 are spread on the S'S' composite fiber web conveyed by the second mesh curtain 42 of the second web-forming machine 22 through the second melt-blown nonwoven fabric forming device 62 and the melt-blown suction module 92 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.

[0102] Step 7: Forming multi-layer laminated nonwoven fabric

[0103] The composite fiber web of S'S'M' is transported from the second mesh curtain 42 of the second mesh machine 22 to the top of the first mesh curtain 41 of the first mesh machine 21, and then covered on the membrane material formed in step 3 after passing through the guide roller 10, forming a composite structural material of FM'S'S' from bottom to top. The composite fiber web is transported from the first mesh curtain 41 of the first mesh machine 21 to the hot rolling device 3, and is reinforced under high temperature and high pressure to form a high-barrier and high-breathable multi-layer laminated nonwoven fabric.

[0104] Example 3 F(SM)M'S'

[0105] 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:

[0106]

[0107] The laminated nonwoven fabric in this embodiment is prepared according to the online production equipment in Example 1 and the preparation method in Reference Example 2. During preparation, the lamination parameters are: the temperature of the first lamination roller is 135°C, the temperature of the second lamination roller is 140°C, and the line pressure is 30N / mm. The parameters of the hot pressing are: the temperature of the flower roller is 145°C, the temperature of the smooth roller is 140°C, and the line pressure is 75N / mm. The parameters of the final laminated nonwoven fabric prepared are shown in Table 1.

[0108] Example 4 F(SM)M'S'S'

[0109] like Figure 2As 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:

[0110]

[0111] The laminated nonwoven fabric in this embodiment is prepared according to the online production equipment in Example 1 and the preparation method in Example 2. During preparation, the lamination parameters are: the temperature of the first lamination roller is 145°C, the temperature of the second lamination roller is 145°C, and the line pressure is 25N / mm. The parameters of the hot pressing are: the temperature of the pattern roller is 145°C, the temperature of the smooth roller is 145°C, and the line pressure is 70N / mm. The parameters of the final laminated nonwoven fabric prepared are shown in Table 1.

[0112] Example 5 F(SMM)M'S'S'

[0113] 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:

[0114]

[0115] The laminated nonwoven fabric in this embodiment is prepared according to the online production equipment in Example 1 and the preparation method in Reference Example 2. During preparation, the lamination parameters are: the temperature of the first lamination roller is 135°C, the temperature of the second lamination roller is 145°C, and the line pressure is 35N / mm. The parameters of the hot pressing are: the temperature of the flower roller is 150°C, the temperature of the smooth roller is 140°C, and the line pressure is 80N / mm. The parameters of the final laminated nonwoven fabric prepared are shown in Table 1.

[0116] Example 6 S''F(SM)M'S'

[0117] like Figure 4 As shown, the laminated nonwoven fabric in this embodiment includes, from bottom to top, a layer of a third spunbonded nonwoven fabric S'', a film material formed by laminating a layer of a first spunbonded nonwoven fabric S and a layer of a first meltblown nonwoven fabric M, a layer of a second meltblown nonwoven fabric M', and a layer of a second spunbonded nonwoven fabric S'. The parameters (gram weight) of each layer are as follows:

[0118]

[0119] The laminated nonwoven fabric in this embodiment is prepared according to the online production equipment in Example 1 and the preparation method in Reference Example 2. During preparation, the lamination parameters are: the temperature of the first lamination roller is 145°C, the temperature of the second lamination roller is 135°C, and the line pressure is 30N / mm. The parameters of the hot pressing are: the temperature of the flower roller is 150°C, the temperature of the smooth roller is 145°C, and the line pressure is 75N / mm. The parameters of the final laminated nonwoven fabric prepared are shown in Table 1.

[0120] Example 7 S''F(SM)M'S'S'

[0121] like Figure 5 As shown, the laminated nonwoven fabric in this embodiment includes, from bottom to top, a layer of third spunbonded nonwoven fabric S'', a film material formed by laminating a layer of first spunbonded nonwoven fabric S and a layer of first meltblown nonwoven fabric M, a layer of second meltblown nonwoven fabric M', a layer of second spunbonded nonwoven fabric S1', and another layer of second spunbonded nonwoven fabric S2'. The parameters (gram weight) of each layer are as follows:

[0122]

[0123] The laminated nonwoven fabric in this embodiment is prepared according to the online production equipment in Example 1 and the preparation method in Reference Example 2. During preparation, the lamination parameters are: the temperature of the first lamination roller is 140°C, the temperature of the second lamination roller is 135°C, and the line pressure is 35N / mm. The parameters of the hot pressing are: the temperature of the flower roller is 145°C, the temperature of the smooth roller is 140°C, and the line pressure is 70N / mm. The parameters of the final laminated nonwoven fabric prepared are shown in Table 1.

[0124] Example 8 S''F (SMM) M'S'S'

[0125] like Figure 6 As shown, the laminated nonwoven fabric in this embodiment includes, from bottom to top, a layer of third spunbonded nonwoven fabric S'', a film material formed by laminating a layer of first spunbonded nonwoven fabric S, a layer of first meltblown nonwoven fabric M1 and another layer of first meltblown nonwoven fabric M2, a layer of second meltblown nonwoven fabric M', a layer of second spunbonded nonwoven fabric S1', and another layer of second spunbonded nonwoven fabric S2'. The parameters (gram weight) of each layer are as follows:

[0126]

[0127] The laminated nonwoven fabric in this embodiment is prepared according to the online production equipment in Example 1 and the preparation method in Reference Example 2. During preparation, the lamination parameters are: the temperature of the first lamination roller is 140°C, the temperature of the second lamination roller is 140°C, and the line pressure is 25N / mm. The parameters of the hot pressing are: the temperature of the flower roller is 150°C, the temperature of the smooth roller is 145°C, and the line pressure is 75N / mm. The parameters of the final laminated nonwoven fabric prepared are shown in Table 1.

[0128] Example 9 F(SMMM)M'S'S'

[0129] 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:

[0130]

[0131] 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.

[0132] Comparative Example 1 S''F (M) S'

[0133] The difference between this comparative example and Example 3 is that the laminated nonwoven fabric in this comparative example includes, from bottom to top, a layer of a third spunbonded nonwoven fabric S'', a layer of a film material formed by laminating the first meltblown nonwoven fabric M, and a layer of a second spunbonded nonwoven fabric S', and the gram weight of the first meltblown nonwoven fabric M is the same as the total gram weight of the first meltblown nonwoven fabric M and the second meltblown nonwoven fabric M' in Example 3. That is, the laminated nonwoven fabric in this comparative example uses the first meltblown nonwoven fabric M in the film material of Example 3 and the second meltblown nonwoven fabric M' outside the film material to form the film material. The parameters (gram weight) of each layer are as follows:

[0134]

[0135] The parameters of the final laminated nonwoven fabric are shown in Table 1.

[0136] Comparative Example 2

[0137] The structure of the laminated nonwoven fabric in this comparative example is basically the same as that in Example 3, that is, it includes, from bottom to top, 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, but all layers are directly hot-rolled once by a hot rolling device. That is, the laminated nonwoven fabric in this comparative example has not been laminated and does not contain a film-like material.

[0138]

[0139] The parameters of the final laminated nonwoven fabric are shown in Table 1.

[0140] Comparative Example 3

[0141] The difference between this comparative example and Example 4 is that in this comparative example, the laminated nonwoven fabric includes, from bottom to top, a layer of first spunbond nonwoven fabric S and a layer of first meltblown nonwoven fabric M1, another layer of first meltblown nonwoven fabric M2 formed by lamination, a layer of second spunbond nonwoven fabric S1', and another layer of second spunbond nonwoven fabric S2'.

[0142] That is, in this comparative example, the second meltblown nonwoven fabric in Example 4 is moved to the first meltblown nonwoven fabric to form another layer of the first meltblown nonwoven fabric, and is pressed together with a layer of the first spunbond nonwoven fabric and a layer of the first meltblown nonwoven fabric to form a membrane material. There are two layers of meltblown nonwoven fabrics in the membrane material, and there is no meltblown nonwoven fabric outside the membrane material.

[0143]

[0144] The parameters of the final laminated nonwoven fabric are shown in Table 1.

[0145] Comparative Example 4

[0146] The difference between this comparative example and Example 4 is that in this comparative example, the laminated nonwoven fabric includes, from bottom to top, a layer of a first spunbond nonwoven fabric S and a layer of a first meltblown nonwoven fabric M1, another layer of the first meltblown nonwoven fabric formed by lamination M2, a layer of a second meltblown nonwoven fabric M', a layer of a second spunbond nonwoven fabric S1', and another layer of a second spunbond nonwoven fabric S2'.

[0147] That is, in this comparative example, the membrane material contains two layers of the first meltblown nonwoven fabric, and the parameters of each layer of the first meltblown nonwoven fabric are consistent with those of the first meltblown nonwoven fabric in Example 4. There are two layers of meltblown nonwoven fabric in the membrane material, and there is also a meltblown nonwoven fabric outside the membrane material.

[0148]

[0149] The parameters of the final laminated nonwoven fabric are shown in Table 1.

[0150] The nonwoven fabric products obtained in the examples and comparative examples were tested for tensile strength, hydrostatic pressure resistance, air permeability, and softness. The tensile strength was tested according to the following test method: ASTM D5035-11, sample width: 50 mm, fixture: 75 mm, speed: 30 mm / min; the hydrostatic pressure test was tested according to the following test method: AATCC 127, speed: 60 mbar / min; the air permeability test was tested according to the following test method: ASTM D737-18, test area: 38 cm², test pressure: 125 Pa; the softness test was tested according to the following test method: WSP 90.3, sample size: 200 mm×200 mm. The test results are shown in Table 1 below.

[0151]

[0152] MD stands for machine direction, which is longitudinal; CD stands for cross direction.

[0153] From the above results, it can be seen that compared with Comparative Examples 1 and 2, Example 3 has the same total mass of the meltblown nonwoven fabric. In Example 3, half of the meltblown nonwoven fabric with the first spunbonded nonwoven fabric is pressed into a film material, and the other half is located outside the film material. Compared with Comparative Example 1, the barrier properties and air permeability can be significantly improved; compared with Comparative Example 2, the barrier properties can be significantly improved under the condition of equivalent air permeability. This shows that under the condition of unchanged gram weight, by setting more layers of meltblown nonwoven fabric, the air permeability and barrier properties can be balanced and the effect can be improved.

[0154] Compared with Example 4, Example 5 contains two layers of the first meltblown nonwoven fabric in the film material, and the total mass of the first meltblown nonwoven fabric in the film material is equal to the total mass of the first meltblown nonwoven fabric in the film material of Example 4. The barrier property of Example 5 is significantly improved, and the air permeability is equivalent. This shows that when the gram weight remains unchanged, more meltblown nonwoven fabrics are evenly arranged and formed into a film material, which can effectively improve the barrier property while maintaining the same air permeability. At the same time, compared with Comparative Example 3, Examples 4 and 5 can achieve significantly improved air permeability while the barrier property is equivalent.

[0155] Compared with Comparative Example 4, although the total mass of the first meltblown nonwoven fabric in the membrane material of Example 9 is less than the total mass of the first meltblown nonwoven fabric in Comparative Example 4, since three layers of 2.25 gsm first meltblown nonwoven fabric are used in the membrane material of Example 9, the barrier property of the product of Example 9 is equivalent to that of Comparative Example 4, but the air permeability is significantly improved.

[0156] The multi-layer nonwoven fabric product of the present invention adopts a multi-M layer design, a part of the M is subjected to lamination, and the remaining M layer is not subjected to lamination, which can achieve the same or better barrier properties as a single-layer M lamination, and at the same time, the air permeability is better than that of a single-layer lamination M of a corresponding gram weight, and the adjustment is more flexible. Lamination of at least one layer of M and S at the same time 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, with better effects under the same material gram weight, reducing production costs, and increasing the comfort and softness of the material.

[0157] In the single web forming method in the prior art, after the meltblown nonwoven is pressed, the air permeability will theoretically be greatly reduced. In the next process, the web laying of the spunbond nonwoven needs suction at the bottom of the net to complete the web laying. After the meltblown nonwoven is pressed, the air permeability is greatly reduced, which will affect the effect of suction at the bottom of the net, thereby affecting the uniformity of the web laying of the spunbond nonwoven, 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 and the second meltblown nonwoven are webbed on another web forming machine, and then composited with the membrane material after web forming, avoiding the influence of the membrane material on the subsequent web laying of the spunbond nonwoven or meltblown nonwoven due to the reduced air permeability after the film is pressed. 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 advantage of using spunbond non-woven fabric and meltblown non-woven fabric for lamination is that the spunbond non-woven fabric layer can enhance the strength and toughness after lamination, and protect the meltblown non-woven fabric layer, and the material is more durable during subsequent processing and use.

[0158] The above embodiments prepared by the method of the present invention are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with the technology to understand the content of the present invention and implement it accordingly, and they cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit and essence of the present invention should be included in the protection scope of the present invention.

Claims

1. A laminated nonwoven fabric, characterized in that: The invention comprises a film material formed by laminating at least one layer of a first spunbonded nonwoven fabric and a layer of a first meltblown nonwoven fabric, at least one layer of a second meltblown nonwoven fabric, and at least one layer of a second spunbonded nonwoven fabric, wherein the film material, the second meltblown nonwoven fabric, and the second spunbonded nonwoven fabric are hot-pressed to form the laminated nonwoven fabric, and the second spunbonded nonwoven fabric covers the side of the second meltblown nonwoven fabric away from the film material; the film material has multiple layers of the first meltblown nonwoven fabric; the total mass ratio of the first meltblown nonwoven fabric in the film material to the total mass ratio of the second meltblown nonwoven fabric outside the film material is 1-1.1:1; The first spunbond nonwoven fabric and the first meltblown nonwoven fabric are formed on the same web-forming machine, the first meltblown nonwoven fabric is formed by fibers directly meltblown on the first spunbond nonwoven fabric, the first spunbond nonwoven fabric and the first meltblown nonwoven fabric form a composite fiber web, and the composite fiber web is pressed into a high-barrier film-like material by a lamination device.

2. The laminated nonwoven fabric according to claim 1, characterized in that: The mass of each layer of the first melt-blown non-woven fabric is equal.

3. The laminated nonwoven fabric according to claim 1, characterized in that: The first spunbond nonwoven fabric and / or the second spunbond nonwoven fabric has a grammage of 10-15 gsm; the first meltblown nonwoven fabric and / or the second meltblown nonwoven fabric has a grammage of 2-5 gsm.

4. The laminated nonwoven fabric according to claim 1, characterized in that: The side of the membrane material away from the second spunbond nonwoven fabric and / or the second meltblown nonwoven fabric has at least one layer of a third spunbond nonwoven fabric and / or at least one layer of a third meltblown nonwoven fabric.

5. The laminated nonwoven fabric according to claim 1, characterized in that: The mass ratio of the first meltblown nonwoven fabric to the first spunbonded nonwoven fabric is 1:1.8-3.0; the mass ratio of the second meltblown nonwoven fabric to the second spunbonded nonwoven fabric is 1:2.5-6.0; and the mass ratio of the meltblown nonwoven fabric to the spunbonded nonwoven fabric in the laminated nonwoven fabric is 1:2.5-6.

6. A method for preparing a laminated nonwoven fabric as claimed in any one of claims 1 to 5, characterized in that: The steps include: forming a first spunbonded nonwoven fabric and a first meltblown nonwoven fabric respectively; Forming a film material by laminating the first spunbond nonwoven fabric and the first meltblown nonwoven fabric; forming a second meltblown nonwoven fabric and a second spunbonded nonwoven fabric; The second meltblown nonwoven fabric, the second spunbonded nonwoven fabric and the film material are hot-pressed to form the laminated nonwoven fabric.

7. The preparation method according to claim 6, characterized in that: The parameters of the lamination are: roller temperature 135-145° C., linear pressure 25-35 N / mm.

8. The preparation method according to claim 6, characterized in that: The parameters of the hot pressing are: roller temperature 140-150° C., linear pressure 70-80 N / mm.

9. The preparation method according to claim 6, characterized in that: The steps include: forming a third spunbond nonwoven fabric and / or a third meltblown nonwoven fabric, wherein 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.

10. Use of the laminated nonwoven fabric according to any one of claims 1 to 5 in protective materials.

11. An on-line production device for laminated nonwoven fabrics according to any one of claims 1 to 5, characterized in that: The invention comprises 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 web 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 web curtain; the film pressing device is used for pressing 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 for hot-pressing 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.

12. The online production equipment according to claim 11, characterized in that: The lamination device includes a first lamination roller and a second lamination roller, a first guide roller and a second guide roller. The first guide roller is used to introduce the first spunbond nonwoven fabric and the first meltblown nonwoven fabric from the first mesh curtain into the first lamination roller and the second lamination roller for lamination. The second guide roller is used to guide the film material pressed by the first lamination roller and the second lamination roller onto the first mesh curtain.

13. The online production equipment according to claim 12, characterized in that: The lamination device includes a cooling roller located between the first lamination roller or the second lamination roller and the second guide roller.

14. The online production equipment according to claim 11, characterized in that: The transmission directions of the first net curtain and the second net curtain are the same or opposite.

15. The online production equipment according to claim 11, characterized in that: It comprises a third web-forming machine, which comprises a third spunbond nonwoven fabric forming device and / or a third meltblown nonwoven fabric forming device, and a third web curtain; the transmission direction of the first web curtain is the same as that of the second web curtain, and is opposite to that of the third web curtain.

16. The online production equipment according to claim 11, characterized in that: 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.

17. The online production equipment according to claim 11, characterized in that: Each melt-blown nonwoven fabric forming device comprises a melt-blown spinning module located above the mesh curtain and a melt-blown suction module located below the mesh curtain, and the melt-blown spinning module and the melt-blown suction module are located in the same vertical direction.

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