Nanofiber composite membrane and production equipment

Abstract

The utility model discloses a nanofiber composite membrane and production equipment, the nanofiber composite membrane comprises a first nanofiber membrane and a second nanofiber membrane which are laminated, the first nanofiber membrane is provided with a first deposition bottom surface and a first deposition surface, and the second nanofiber membrane is provided with a second deposition bottom surface and a second deposition surface. The first deposition surface is attached to the second deposition surface. According to the nanofiber composite membrane, the first deposition surface and the second deposition surface with many flaws are attached to each other, namely in the nanofiber composite membrane, so that the surface of the nanofiber composite membrane is smooth, and the flaws on the first deposition surface and the flaws on the second deposition surface can make up for each other in probability; in addition, the thickness of the first nanofiber membrane and the thickness of the second nanofiber membrane can be reduced, so that the production speed of the first nanofiber membrane and the second nanofiber membrane can be increased, the uniformity of membrane material stacking is improved, and the performance of the nanofiber composite membrane is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of nanofiber membranes, in particular to a nanofiber composite membrane and production equipment. Background Art

[0002] Nanofiber membranes are formed by electrospinning to produce filaments or fine mist jet deposition. However, due to the many factors that affect the deposition of membrane materials during the production process, the deposition effect is unstable and difficult to control, which may cause the deposition surface of the membrane material 01 (i.e. the surface formed after deposition) to have many spots and other defects 03. Figure 1 Some defects are difficult to improve by adjusting the process; moreover, during the membrane production process, the jet is disturbed by the charge on the surface of the deposited fiber membrane, which will cause uneven stacking. Especially when producing thicker membrane materials, the production speed needs to be controlled relatively slowly, which will aggravate the uneven stacking phenomenon and reduce the anti-permeability and other properties of the nanofiber membrane. Utility Model Content

[0003] The main purpose of the utility model is to propose a nanofiber composite membrane and production equipment, aiming to solve the technical problems in the prior art that the surface of the nanofiber membrane has many defects, the membrane material is not evenly stacked, and the performance of the nanofiber membrane is reduced.

[0004] To achieve the above-mentioned objectives, the first aspect of the present invention proposes a nanofiber composite membrane, comprising a first nanofiber membrane and a second nanofiber membrane stacked together, wherein the first nanofiber membrane has a first deposition bottom surface and a first deposition surface, and the second nanofiber membrane has a second deposition bottom surface and a second deposition surface, and the first deposition surface and the second deposition surface are in contact with each other.

[0005] The present nanofiber composite membrane is formed by stacking two layers of a first nanofiber membrane and a second nanofiber membrane, and the first deposition surface with more defects and the second deposition surface are attached to each other, that is, inside the nanofiber composite membrane, while the relatively flat first deposition bottom surface and the second deposition bottom surface are on the outside of the nanofiber composite membrane, so that the surface of the nanofiber composite membrane is relatively flat, and the defects on the first deposition surface and the defects on the second deposition surface can compensate each other in probability, thereby improving the uniformity of the nanofiber composite membrane. In addition, since the thickness of the nanofiber composite membrane is composed of the first nanofiber membrane and the second nanofiber membrane, the thickness of the first nanofiber membrane and the thickness of the second nanofiber membrane can be produced thinner, thereby speeding up the production speed of the first nanofiber membrane and the second nanofiber membrane, reducing the interference of the surface charge of the deposited fibers on the deposition area of the subsequent deposition jet, improving the uniformity of the membrane material stacking, and improving the performance of the nanofiber composite membrane.

[0006] Preferably, the first nanofiber membrane and the second nanofiber membrane are composited by hot pressing.

[0007] Preferably, the nanofiber composite membrane further comprises an outer protective film, which is arranged on the outer side of the first nanofiber membrane and / or the second nanofiber membrane. The outer protective film can play a protective role on the outer side.

[0008] Preferably, the outer protective film is composited with the first nanofiber membrane and the second nanofiber membrane by hot pressing.

[0009] In a second aspect, the present invention further provides a production device for producing the above-mentioned nanofiber composite membrane, the production device comprising a first electrospinning component, a second electrospinning component and a first hot pressing component;

[0010] The first electrospinning assembly includes a first fiber generating device and a first fiber receiving and conveying device, wherein the first fiber generating device is capable of generating fibers and ejecting the fibers toward the first fiber receiving and conveying device, and the first fiber receiving and conveying device is capable of receiving the jet ejected from the first fiber generating device and depositing the jet into the first nanofiber membrane, such that the first deposition bottom surface faces the first fiber receiving and conveying device and the first deposition surface faces the first fiber generating device, and the first fiber receiving and conveying device is capable of conveying the first nanofiber membrane to the first hot pressing assembly;

[0011] The second electrospinning assembly includes a second fiber generating device and a second fiber receiving and conveying device, the second fiber generating device is capable of generating fibers and ejecting them toward the second fiber receiving and conveying device, the second fiber receiving and conveying device is capable of receiving the jet ejected from the second fiber generating device and depositing it into the second nanofiber film, so that the second deposition bottom surface faces the second fiber receiving and conveying device and the second deposition surface faces the second fiber generating device, and the second fiber receiving and conveying device is capable of conveying the second nanofiber film to the second hot pressing assembly;

[0012] The first hot pressing component is arranged in a position corresponding to the first electrospinning component and the second electrospinning component. The first hot pressing component includes two first hot pressing rollers, and the two first hot pressing rollers can perform hot pressing and compounding on the first nanofiber membrane separated from the first fiber receiving and conveying device and the second nanofiber membrane separated from the second fiber receiving and conveying device.

[0013] The first fiber generating device and the first fiber receiving and conveying device can continuously produce the first nanofiber membrane and continuously convey the first nanofiber membrane to the first hot pressing assembly. The second fiber generating device and the second fiber receiving and conveying device can continuously produce the second nanofiber membrane and continuously convey the second nanofiber membrane to the first hot pressing assembly. The first nanofiber membrane and the second nanofiber membrane are hot-pressed and composited on the two first hot pressing rollers.

[0014] This production equipment adopts online production to form nanofiber composite membranes. The first nanofiber membranes and the second nanofiber membranes produced by the first electrospinning component and the second electrospinning component are successively transported to the first hot pressing component for compounding, which can reduce the equipment space and the difficulty of equipment implementation. Moreover, since the thickness of the first nanofiber membrane and the second nanofiber membrane is relatively thin, the online production using this production equipment does not require the first nanofiber membrane and the second nanofiber membrane to be separately rolled up and then unrolled at another position for compounding. The structure of the membrane itself is not easily damaged by multiple processing, so as not to affect the performance of the membrane.

[0015] Preferably, the production equipment further comprises a protective film discharge device and a second hot pressing assembly, the second hot pressing assembly being arranged on a side of the first hot pressing assembly away from the first electrospinning assembly and the second electrospinning assembly, and the protective film discharge device is arranged correspondingly to the second hot pressing assembly;

[0016] The protective film unloading device includes a protective film unloading roller, which can place the outer protective film coil and unload the outer protective film;

[0017] The second hot pressing assembly includes two second hot pressing rollers, and the two second hot pressing rollers can perform hot pressing on the outer protective film discharged from the protective film discharge roller and the composite film of the first nanofiber membrane and the second nanofiber membrane.

[0018] Preferably, the production equipment also includes a composite membrane receiving device, which includes a composite membrane receiving roller. The composite membrane receiving roller is arranged corresponding to the positions of the first electrospinning component and the second electrospinning component, and the composite membrane receiving roller can roll up the nanofiber composite membrane.

[0019] Preferably, the first fiber receiving and conveying device and the second fiber receiving and conveying device are arranged in opposite directions, the first fiber generating device is located above the first fiber receiving and conveying device, the second fiber generating device is located above the second fiber receiving and conveying device, and the first electrospinning assembly and the second electrospinning assembly are respectively located on either side of the upper side of the first hot pressing assembly. This arrangement facilitates the proximity of the first deposition surface of the first nanofiber membrane and the second deposition surface of the first nanofiber membrane, reducing equipment space.

[0020] In a third aspect, the present invention further provides a method for producing the above-mentioned nanofiber composite membrane, the method comprising the following steps:

[0021] S1: producing the first nanofiber membrane by deposition through an electrospinning process, and producing the second nanofiber membrane by deposition through an electrospinning process;

[0022] S2: attaching the first deposition surface of the first nanofiber membrane to the second deposition surface of the second nanofiber membrane;

[0023] S3: Compounding the first nanofiber membrane and the second nanofiber membrane by hot pressing.

[0024] By adopting the production method, a nanofiber composite membrane with a smoother surface and higher membrane uniformity can be produced, thereby improving the performance of the nanofiber composite membrane.

[0025] Preferably, the first nanofiber membrane is formed by continuous deposition between a first fiber generating device and a first fiber receiving and conveying device, with the conveying direction of the first nanofiber membrane being the first direction, and the position of the first nanofiber membrane and the second nanofiber membrane being hot-pressed and composited relative to the position of the first fiber receiving and conveying device in the first direction being the front side, the first fiber generating device comprises at least two first fiber generating units arranged along the first direction, and the first fiber generating unit located at the rearmost side in the first direction is called a first rear-end generating unit, and the absolute value of the potential difference between the first rear-end generating unit and the first fiber receiving and conveying device is greater than the absolute value of the potential difference between at least one of the first fiber generating units located at the front side and the first fiber receiving and conveying device;

[0026] The second nanofiber membrane is formed by continuous deposition between a second fiber generating device and a second fiber receiving and conveying device, with the conveying direction of the second nanofiber membrane being the second direction, and the position of the first nanofiber membrane and the second nanofiber membrane being hot-pressed and composited relative to the position of the second fiber receiving and conveying device in the second direction being the front side, and the second fiber generating device includes at least two second fiber generating units arranged along the second direction, and the second fiber generating unit located at the rearmost side in the second direction is called the second rear end generating unit, and the absolute value of the potential difference between the second rear end generating unit and the second fiber receiving and conveying device is greater than the absolute value of the potential difference between at least one second fiber generating unit located on the front side and the second fiber receiving and conveying device.

[0027] Since the absolute value of the potential difference between the first rear-end generating unit and the first fiber receiving and conveying device is large, and the absolute value of the potential difference between the second rear-end generating unit and the second fiber receiving and conveying device is large, the diameter of the first deposited fiber is larger, that is, the diameter of the fiber close to the first deposition bottom surface in the first nanofiber membrane is relatively large, and the diameter of the fiber close to the second deposition bottom surface in the second nanofiber membrane is relatively large, which can improve the strength and mechanical properties of the surface of the nanofiber composite membrane.

[0028] Preferably, the production method further comprises step S4: superimposing an outer protective film on the composite film formed by the first nanofiber membrane and the second nanofiber membrane and compounding them by hot pressing. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0030] Figure 1 Schematic diagram of the structure of an existing single-layer nanofiber membrane with defects on the deposited surface;

[0031] Figure 2 The structure of the nanofiber composite membrane of the utility model is shown as follows Figure 1 ;

[0032] Figure 3 The structure of the nanofiber composite membrane of the utility model is shown as follows Figure 2 ;

[0033] Figure 4 It is a structural schematic diagram of the production equipment of the present utility model.

[0034] In the accompanying drawings: 1-first nanofiber membrane, 11-first deposition bottom surface, 12-first deposition surface, 2-second nanofiber membrane, 21-second deposition bottom surface, 22-second deposition surface, 3-outer protective film, 41-first fiber generating device, 411-first fiber generating unit, 412-first rear end generating unit, 42-first fiber receiving and conveying device, 51-second fiber generating device, 511-second fiber generating unit, 512-second rear end generating unit, 52-second fiber receiving and conveying device, 61-first hot pressing roller, 71-protective film discharge roller, 81-second hot pressing roller, 91-composite membrane receiving roller.

[0035] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0036] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described 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 those skilled in the art without making creative efforts shall fall within the scope of protection of the present invention.

[0037] It should be noted that if the embodiments of the present invention involve directional indications, such as up, down, left, right, front, and back, the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0038] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of such features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0039] First, refer to Figure 2 A nanofiber composite membrane includes a first nanofiber membrane 1 and a second nanofiber membrane 2 stacked together, the first nanofiber membrane 1 having a first deposition bottom surface 11 and a first deposition surface 12, the second nanofiber membrane 2 having a second deposition bottom surface 21 and a second deposition surface 22, and the first deposition surface 12 and the second deposition surface 22 are in contact with each other.

[0040] The present nanofiber composite membrane is formed by stacking a first nanofiber membrane 1 and a second nanofiber membrane 2, and the first deposition surface 12 and the second deposition surface 22 with more defects are in contact with each other, that is, on the inside of the nanofiber composite membrane, while the relatively flat first deposition bottom surface 11 and the second deposition bottom surface 21 are on the outside of the nanofiber composite membrane, making the surface of the nanofiber composite membrane relatively flat, and the defects on the first deposition surface 12 and the defects on the second deposition surface 22 can compensate for each other in probability, thereby improving the uniformity of the nanofiber composite membrane. In addition, since the thickness of the nanofiber composite membrane is composed of the first nanofiber membrane 1 and the second nanofiber membrane 2, when compared with the production of a single-layer nanofiber membrane of the same thickness and the present nanofiber composite membrane, the existing single-layer nanofiber membrane is thicker and the production is slower, while the thickness of the first nanofiber membrane 1 and the thickness of the second nanofiber membrane 2 in the present nanofiber composite membrane can be produced thinner, thereby speeding up the production speed of the first nanofiber membrane 1 and the second nanofiber membrane 2, reducing the interference of the surface charge of the deposited fibers on the deposition area of the subsequent deposition jet, improving the uniformity of the membrane material stacking, and improving the performance of the nanofiber composite membrane.

[0041] In some specific embodiments, the first nanofiber membrane 1 and the second nanofiber membrane 2 are laminated by hot pressing, which is more convenient for bonding and fixing the first nanofiber membrane 1 and the second nanofiber membrane 2. In other embodiments, the first nanofiber membrane 1 and the second nanofiber membrane 2 can also be bonded by glue.

[0042] In some specific embodiments, referring to Figure 3 The nanofiber composite membrane further includes an outer protective film 3, which is disposed on the outside of the first nanofiber membrane 1 and / or the second nanofiber membrane 2. The outer protective film 3 can provide protection on the outside. The outer protective film 3 can be made of a PE film or other thermoplastic film.

[0043] Furthermore, the outer protective film 3 is composited with the first nanofiber membrane 1 and the second nanofiber membrane 2 by hot pressing.

[0044] Secondly, refer to Figure 4 , a production equipment for producing the above-mentioned nanofiber composite membrane, the production equipment includes a first electrospinning component, a second electrospinning component and a first hot pressing component.

[0045] The first electrospinning component includes a first fiber generating device 41 and a first fiber receiving and conveying device 42. An electric field is provided between the first fiber generating device 41 and the first fiber receiving and conveying device 42. The first fiber generating device 41 can generate fibers and eject them toward the first fiber receiving and conveying device 42. The first fiber receiving and conveying device 42 can receive the jet ejected from the first fiber generating device 41 and deposit it into a first nanofiber membrane 1, so that the first deposition bottom surface 11 faces the first fiber receiving and conveying device 42 and the first deposition surface 12 faces the first fiber generating device 41. The first fiber receiving and conveying device 42 can convey the first nanofiber membrane 1 to the first hot pressing component. The first nanofiber membrane 1 is separated at one end of the first fiber receiving and conveying device 42 close to the first hot pressing component.

[0046] The second electrospinning component includes a second fiber generating device 51 and a second fiber receiving and conveying device 52. An electric field is provided between the second fiber generating device 51 and the second fiber receiving and conveying device 52. The second fiber generating device 51 can generate fibers and eject them toward the second fiber receiving and conveying device 52. The second fiber receiving and conveying device 52 can receive the jet ejected from the second fiber generating device 51 and deposit it into a second nanofiber membrane 2, so that the second deposition bottom surface 21 faces the second fiber receiving and conveying device 52 and the second deposition surface 22 faces the second fiber generating device 51. The second fiber receiving and conveying device 52 can convey the second nanofiber membrane 2 to the second hot pressing component. The second nanofiber membrane 2 is separated at one end of the second fiber receiving and conveying device 52 close to the first hot pressing component.

[0047] The first hot pressing assembly is arranged in a corresponding position to the first electrospinning assembly and the second electrospinning assembly. The first hot pressing assembly includes two first hot pressing rollers 61. The two first hot pressing rollers 61 can perform hot pressing and compounding on the first nanofiber membrane 1 separated from the first fiber receiving and conveying device 42 and the second nanofiber membrane 2 separated from the second fiber receiving and conveying device 52.

[0048] The first fiber generating device 41 and the first fiber receiving and conveying device 42 can continuously produce the first nanofiber membrane 1 and continuously convey the first nanofiber membrane 1 to the first hot pressing component. The second fiber generating device 51 and the second fiber receiving and conveying device 52 can continuously produce the second nanofiber membrane 2 and continuously convey the second nanofiber membrane 2 to the first hot pressing component. The first nanofiber membrane 1 and the second nanofiber membrane 2 are hot-pressed and composited on two first hot pressing rollers 61.

[0049] The present production equipment adopts online production to form nanofiber composite membranes. The first nanofiber membrane 1 and the second nanofiber membrane 2 produced by the first electrospinning component and the second electrospinning component are successively transported to the first hot pressing component for compounding, which can reduce the equipment space and the difficulty of equipment implementation. Moreover, since the thickness of the first nanofiber membrane 1 and the second nanofiber membrane 2 is relatively thin, the online production using the present production equipment does not require first separately winding up the first nanofiber membrane 1 and the second nanofiber membrane 2 and then unwinding them at another location for compounding. The structure of the membrane itself is not easily damaged by multiple processing, so as not to affect the performance of the membrane.

[0050] In some specific embodiments, the first fiber generating device 41 and the second fiber generating device 51 may be nozzles or other fiber jet generating structures. The first fiber receiving and conveying device 42 and the second fiber receiving and conveying device 52 may be belt conveying structures.

[0051] In some specific embodiments, the production equipment also includes a protective film discharge device and a second hot pressing component. The second hot pressing component is arranged on the side of the first hot pressing component away from the first electrospinning component and the second electrospinning component. The protective film discharge device is arranged in a corresponding position to the second hot pressing component.

[0052] The protective film unloading device includes a protective film unloading roller 71, which can place the outer protective film coil and unload the outer protective film 3. The outer protective film coil is placed on the protective film unloading roller 71 and the outer protective film 3 can be continuously unloaded.

[0053] The second hot pressing assembly includes two second hot pressing rollers 81, which can hot press the outer protective film 3 released from the protective film discharge roller 71 and the composite film of the first nanofiber membrane 1 and the second nanofiber membrane 2, so that the outer protective film 3 and the composite film of the first nanofiber membrane 1 and the second nanofiber membrane 2 are continuously composited and fixed, which is convenient for production.

[0054] In some specific embodiments, the production equipment further includes a composite film receiving device, which includes a composite film receiving roller 91. Composite film receiving roller 91 is positioned corresponding to the first electrospinning assembly and the second electrospinning assembly, and is capable of receiving the nanofiber composite film. After the nanofiber composite film is produced, the nanofiber composite film is continuously transported to the composite film receiving roller 91, where it is rolled into a finished roll, facilitating production.

[0055] In some specific embodiments, the conveying directions of the first fiber receiving and conveying device 42 and the second fiber receiving and conveying device 52 are arranged to face each other, the first fiber generating device 41 is located on the upper side of the first fiber receiving and conveying device 42, the second fiber generating device 51 is located on the upper side of the second fiber receiving and conveying device 52, and the first electrospinning component and the second electrospinning component are respectively located on both sides of the upper side of the first hot pressing component.

[0056] In this way, the first deposition surface 12 of the first nanofiber membrane 1 is facing upward on the first fiber receiving and conveying device 42, and the second deposition surface 22 of the second nanofiber membrane 2 is facing upward on the second fiber receiving and conveying device 52. The first nanofiber membrane 1 and the second nanofiber membrane 2 are conveyed toward each other and downward. This arrangement facilitates the proximity of the first deposition surface 12 of the first nanofiber membrane 1 and the second deposition surface 22 of the first nanofiber membrane 1, thereby reducing equipment space.

[0057] In a third aspect, a method for producing the above-mentioned nanofiber composite membrane comprises the following steps:

[0058] S1: producing a first nanofiber membrane 1 by deposition through an electrospinning process, and producing a second nanofiber membrane 2 by deposition through an electrospinning process;

[0059] S2: attaching the first deposition surface 12 of the first nanofiber membrane 1 to the second deposition surface 22 of the second nanofiber membrane 2;

[0060] S3: Compounding the first nanofiber membrane 1 and the second nanofiber membrane 2 by hot pressing.

[0061] By adopting the production method, a nanofiber composite membrane with a smoother surface and higher membrane uniformity can be produced, thereby improving the performance of the nanofiber composite membrane.

[0062] In some specific embodiments, the first nanofiber membrane 1 is formed by continuous deposition between the first fiber generating device 41 and the first fiber receiving and conveying device 42, with the conveying direction of the first nanofiber membrane 1 being the first direction, and the position in the first direction where the first nanofiber membrane 1 and the second nanofiber membrane 2 are hot-pressed and composited relative to the position of the first fiber receiving and conveying device 42 being the front side, the first fiber generating device 41 includes at least two first fiber generating units 411 arranged along the first direction, and the first fiber generating unit 411 located at the rearmost side in the first direction is called the first rear end generating unit 412, and the absolute value of the potential difference between the first rear end generating unit 412 and the first fiber receiving and conveying device 42 is greater than the absolute value of the potential difference between at least one first fiber generating unit 411 located at the front side and the first fiber receiving and conveying device 42;

[0063] The second nanofiber membrane 2 is formed by continuous deposition between the second fiber generating device 51 and the second fiber receiving and conveying device 52, with the conveying direction of the second nanofiber membrane 2 as the second direction, and the position of the first nanofiber membrane 1 and the second nanofiber membrane 2 hot-pressed and composited relative to the position of the second fiber receiving and conveying device 52 in the second direction as the front side. The second fiber generating device 51 includes at least two second fiber generating units 511 arranged along the second direction, and the second fiber generating unit 511 located at the rearmost side in the second direction is called the second rear end generating unit 512. The absolute value of the potential difference between the second rear end generating unit 512 and the second fiber receiving and conveying device 52 is greater than the absolute value of the potential difference between at least one second fiber generating unit 511 located on the front side and the second fiber receiving and conveying device 52.

[0064] Since the absolute value of the potential difference between the first rear-end generating unit 412 and the first fiber receiving and conveying device 42 is large, and the absolute value of the potential difference between the second rear-end generating unit 512 and the second fiber receiving and conveying device 52 is large, the diameter of the first deposited fiber is larger, that is, the fiber diameter close to the first deposition bottom surface 11 in the first nanofiber membrane 1 is relatively large, and the fiber diameter close to the second deposition bottom surface 21 in the second nanofiber membrane 2 is relatively large, which can improve the strength and mechanical properties of the surface of the nanofiber composite membrane.

[0065] Specifically, the absolute value of the potential difference between the first rear end generating unit 412 and the first fiber receiving and conveying device 42 can be the maximum value among the multiple first fiber generating units 411, and the absolute value of the potential difference between the second rear end generating unit 512 and the second fiber receiving and conveying device 52 can be the maximum value among the multiple second fiber generating units 511.

[0066] In some specific embodiments, the production method further includes step S4: superimposing the outer protective film 3 onto the composite film formed by the first nanofiber membrane 1 and the second nanofiber membrane 2 and combining them by hot pressing. The outer protective film 3 forms a protective film on the composite film formed by the first nanofiber membrane 1 and the second nanofiber membrane 2, and the hot pressing facilitates the fixation of the composite phase.

[0067] The above description is only a preferred embodiment of the present invention and does not limit the patent scope of the present invention. All equivalent structural transformations made by using the contents of the present invention specification and drawings under the utility model concept, or direct / indirect application in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A nanofiber composite membrane, characterized in that The invention comprises a first nanofiber membrane (1) and a second nanofiber membrane (2) which are stacked, wherein the first nanofiber membrane (1) has a first deposition bottom surface (11) and a first deposition surface (12), and the second nanofiber membrane (2) has a second deposition bottom surface (21) and a second deposition surface (22), and the first deposition surface (12) and the second deposition surface (22) are in contact with each other.

2. The nanofiber composite membrane according to claim 1, wherein The first nanofiber membrane (1) and the second nanofiber membrane (2) are composited by hot pressing.

3. The nanofiber composite membrane according to claim 1, wherein The nanofiber composite membrane further comprises an outer protective membrane (3), and the outer protective membrane (3) is arranged on the outer side of the first nanofiber membrane (1) and / or the second nanofiber membrane (2).

4. The nanofiber composite membrane according to claim 3, wherein The outer protective film (3) is composited with the first nanofiber membrane (1) and the second nanofiber membrane (2) by hot pressing.

5. A production equipment, characterized in that, Used to produce the nanofiber composite membrane according to any one of claims 1 to 4, the production equipment comprises a first electrospinning component, a second electrospinning component and a first hot pressing component; The first electrospinning assembly comprises a first fiber generating device (41) and a first fiber receiving and conveying device (42), wherein the first fiber generating device (41) is capable of generating fibers and ejecting the fibers toward the first fiber receiving and conveying device (42), and the first fiber receiving and conveying device (42) is capable of receiving the jet ejected from the first fiber generating device (41) and depositing the jet into the first nanofiber membrane (1), so that the first deposition bottom surface (11) faces the first fiber receiving and conveying device (42), and the first deposition surface (12) faces the first fiber generating device (41), and the first fiber receiving and conveying device (42) is capable of conveying the first nanofiber membrane (1) to the first hot pressing assembly; The second electrospinning assembly comprises a second fiber generating device (51) and a second fiber receiving and conveying device (52), the second fiber generating device (51) is capable of generating fibers and ejecting them toward the second fiber receiving and conveying device (52), the second fiber receiving and conveying device (52) is capable of receiving the jet ejected from the second fiber generating device (51) and depositing it into the second nanofiber membrane (2), so that the second deposition bottom surface (21) faces the second fiber receiving and conveying device (52) and the second deposition surface (22) faces the second fiber generating device (51), and the second fiber receiving and conveying device (52) is capable of conveying the second nanofiber membrane (2) to the second hot pressing assembly; The first hot pressing component is arranged in a position corresponding to the first electrospinning component and the second electrospinning component, and the first hot pressing component includes two first hot pressing rollers (61), and the two first hot pressing rollers (61) can perform hot pressing and compounding on the first nanofiber membrane (1) separated from the first fiber receiving and conveying device (42) and the second nanofiber membrane (2) separated from the second fiber receiving and conveying device (52).

6. The production equipment according to claim 5, characterized in that The production equipment further includes a protective film discharge device and a second hot pressing assembly, wherein the second hot pressing assembly is arranged on a side of the first hot pressing assembly away from the first electrospinning assembly and the second electrospinning assembly, and the protective film discharge device is arranged correspondingly to the position of the second hot pressing assembly; The protective film discharge device comprises a protective film discharge roller (71), and the protective film discharge roller (71) is capable of placing the outer protective film coil and discharging the outer protective film (3); The second hot pressing assembly includes two second hot pressing rollers (81), and the two second hot pressing rollers (81) can perform hot pressing on the outer protective film (3) discharged from the protective film discharge roller (71) and the composite film of the first nanofiber membrane (1) and the second nanofiber membrane (2).

7. The production equipment according to claim 5, characterized in that The production equipment also includes a composite film receiving device, which includes a composite film receiving roller (91). The composite film receiving roller (91) is arranged corresponding to the positions of the first electrospinning component and the second electrospinning component. The composite film receiving roller (91) can roll up the nanofiber composite film.

8. The production equipment according to claim 5, characterized in that The conveying directions of the first fiber receiving and conveying device (42) and the second fiber receiving and conveying device (52) are arranged to face each other, the first fiber generating device (41) is located on the upper side of the first fiber receiving and conveying device (42), the second fiber generating device (51) is located on the upper side of the second fiber receiving and conveying device (52), and the first electrospinning component and the second electrospinning component are respectively located on both sides of the upper side of the first hot pressing component.

Images