Membrane compounding device

Abstract

The utility model discloses a film compounding device which comprises a drying oven and a compression roller, and the drying oven is used for heating two or more layers of films to be compounded; the compression rollers at least comprise a first compression roller and a second compression roller, and the first compression roller and the second compression roller apply pressure to the two or more layers of films heated by the drying oven so as to enable the two or more layers of films to form a composite film; the drying oven is provided with an inlet and an outlet, and the to-be-compounded two-layer or multi-layer film enters the drying oven from the inlet, is heated in the drying oven and then is output from the outlet; a heat source is arranged in the oven and used for increasing the temperature of the oven. The heating process and the rolling process of two or more layers of films are divided into two stages, the films can be fully preheated and then pressed instantly by adopting the oven for heating, the composite film with stable performance and uniform aperture can be obtained, the performance of the composite film is prevented from being reduced, and the service life of the roller can be prolonged.

Description

TECHNICAL FIELD

[0001] The utility model relates to a film composite device. BACKGROUND

[0002] PTFE (polytetrafluoroethylene) membranes are widely used in various industrial fields due to their unique physical and chemical properties as filtration and separation membranes. PTFE membranes are typically prepared through special processing techniques, such as biaxial stretching technology, to form microporous membranes with node structures. This structure endows PTFE membranes with air permeability but water impermeability, while maintaining high filtration efficiency and low operating resistance. In liquid filtration, PTFE membranes can effectively filter and purify liquids, especially in situations where precise control of filtration accuracy and stability of the filtration medium are required. Multi-layer PTFE membrane hot pressing composite technology is a process that combines multiple layers of PTFE membranes together through high temperature and pressure. During the hot pressing composite process, the multiple layers of PTFE membranes are fused under controlled temperature and pressure to form a more robust and durable multi-layer composite PTFE membrane material. This can improve the overall mechanical properties of the PTFE membrane, such as strength and toughness, while maintaining the chemical stability and high-temperature resistance of the PTFE membrane.

[0003] In the prior art, multi-layer PTFE membrane hot pressing composite equipment usually adopts a "roller heating + roller pressing composite" process, generally two rollers are set, one is a metal heating roller for heating the PTFE membrane, and the other is a rubber non-heating roller. The metal heating roller and the rubber non-heating roller cooperate with each other to apply pressure to two or more layers of PTFE membranes to composite the multiple layers of PTFE membranes together. In this equipment, the heating and roller pressing of the membrane are completed at the same time, but there are the following defects:

[0004] Firstly, if both rollers are metal heating rollers, since the PTFE membrane is very thin, with a thickness of microns, the two metal heating rollers are prone to wear and damage the surface of the PTFE membrane, and cannot achieve the composite effect. However, when using one metal heating roller, the PTFE membrane in contact with the rubber roller cannot be effectively heated, and the adhesion of the two layers of membrane is realized only by the heat of the PTFE membrane in contact with the metal roller, resulting in performance differences on both sides of the composite membrane.

[0005] Secondly, since the heating and roller pressing of the membrane are completed at the same time, the area or length of the PTFE membrane in contact with the metal heating roller is short, and the PTFE membrane cannot be fully heated. When the two layers of PTFE membrane enter the roller gap, it is very easy to cause insufficient temperature and cannot be bonded, even if the roller pressure is increased, it cannot be bonded.

[0006] Third, during the two-roll hot-pressing lamination process, the temperature of the rollers needs to be precisely controlled to ensure that the PTFE film can bond at a suitable temperature. Improper temperature control may lead to a decrease in the performance of the laminated PTFE film or a poor lamination effect. In existing technologies, because the metal heating rollers are exposed to the air, they have significant heat dissipation, making it difficult to ensure that the PTFE film is sufficiently heated, and even more difficult to ensure the stability of the heating temperature or environment. In addition, maintaining the high temperature of the rollers requires a large amount of energy, which leads to high production costs.

[0007] Fourth, during long-term operation, the repeated heating-cooling-heating of the pressure rollers can easily cause quality problems on the surface of the metal rollers, such as a decrease in roundness. This will affect the quality of the composite film and may require periodic replacement or maintenance.

[0008] Fifth, the roller heating efficiency is relatively low, which may limit the production speed of two-roll hot pressing composite, especially in mass production.

[0009] Sixth, because roller heating does not easily heat the PTFE membrane evenly, and the air environment has a great influence on the temperature field, the pore size of the PTFE membrane varies greatly, which seriously affects the performance of the PTFE membrane. Summary of the Invention

[0010] In order to solve the aforementioned technical problems in the prior art, this utility model provides a membrane composite device.

[0011] The technical solution to achieve the purpose of this utility model is: a membrane composite device, including an oven and a pressure roller, wherein the oven is used to heat two or more layers of membrane to be composited; the pressure roller includes at least a first pressure roller and a second pressure roller, wherein the first pressure roller and the second pressure roller apply pressure to the two or more layers of membrane heated in the oven so that the two or more layers of membrane form a composite membrane.

[0012] In a preferred embodiment, the oven is provided with an inlet and an outlet. The two or more layers of film to be laminated enter the oven through the inlet, are heated inside the oven, and are then output through the outlet.

[0013] As a preferred embodiment, a heat source is provided inside the oven to increase the oven temperature.

[0014] In one preferred embodiment, the heat source is one or more of a heating rod, a resistance wire, an infrared heating device, and a medium-wave heating plate.

[0015] In a preferred embodiment, the film also includes a film feeding device and a film taking device. The two or more layers of film to be laminated are placed on the corresponding film feeding devices. The front ends of the two or more layers of film pass through the oven and the seam between the first pressure roller and the second pressure roller 22 and are then fixed on the film taking device, which provides traction force.

[0016] In a preferred embodiment, the membrane is a PTFE membrane.

[0017] In a preferred embodiment, the heating time of two or more layers of film in the oven and the bonding speed of the first and second pressure rollers on the film are adjusted by controlling the traction speed of the film taking device.

[0018] As a preferred embodiment, the oven has several heating rods distributed vertically inside, with a PTFE membrane passageway in the middle.

[0019] As a preferred embodiment, a guide roller is provided on the outside of the oven near the inlet to guide the film to be laminated into the inlet.

[0020] As a preferred embodiment, a guide roller is provided outside the oven near the outlet to guide the film to be laminated into the crimping gap between the first pressure roller and the second pressure roller.

[0021] Compared with the prior art, the significant advantages of this utility model are:

[0022] (1) It is easier to control the pore size and obtain uniform product performance. This utility model divides the heating process and rolling process of two or more layers of film into two stages. The oven heating can fully preheat the PTFE film and then press it instantly to obtain a composite film with stable performance and uniform pore size.

[0023] (2) This utility model is equipped with an independent heating oven, which first heats the PTFE film to a predetermined temperature before it enters the roller gap for pressing. The oven temperature is precisely controlled, the heating is rapid, and the production energy consumption is low. At the same time, the pressure roller is not heated, which can extend the service life of the roller.

[0024] Other features and advantages of this invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of this invention may be realized and obtained by means of the structures particularly pointed out in the written description, claims, and drawings. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of a membrane composite device in the prior art.

[0026] Figure 2 This is a front view of the membrane composite device in an embodiment of this utility model.

[0027] Figure 3 This is a cross-sectional view of the membrane composite device in an embodiment of this utility model. Detailed Implementation

[0028] It is readily understood that, based on the technical solution of this utility model, those skilled in the art can conceive of various embodiments of this utility model without altering its essential spirit. Therefore, the following detailed embodiments and accompanying drawings are merely illustrative descriptions of the technical solution of this utility model and should not be considered as the entirety of this utility model or as limitations or restrictions on its technical solution.

[0029] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that, unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the present invention.

[0030] The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the invention or its application or use.

[0031] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and equipment should be considered part of the specification.

[0032] In all the examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values.

[0033] The inventive concept of this utility model is to separate the heating and rolling processes of two or more layers of film into two stages, rather than performing rolling simultaneously with heating as in existing technologies. Therefore, the film laminating device of this utility model includes an oven 1 and pressure rollers. The oven 1 is used to heat the two or more layers of film 31 to be laminated. The pressure rollers include at least a first pressure roller 21 and a second pressure roller 22. The first pressure roller 21 and the second pressure roller 22 cooperate to apply pressure to the two or more layers of film 31 after heating in the oven, thus completing the rolling process and laminating the two or more layers of film 31 to form a composite film 32. The oven 1 is used to heat the two or more layers of film 31 to soften them, so that they can better adhere together to form the composite film 32 during the subsequent rolling process. The heating temperature and holding time of the oven 1 need to be precisely controlled to ensure that the two or more layers of film 31 reach a suitable processing state, while avoiding overheating that could lead to a decline in the performance of the composite film 32.

[0034] The oven 1 can be rectangular or square, etc. The oven 1 is equipped with an inlet 11 and an outlet 12. Two or more layers of film 31 to be laminated enter the oven 1 through the inlet 11, are heated inside the oven 1, and then exit through the outlet 12. By setting the inlet 11 and outlet 12 on the oven 1, the film heating area is made into a relatively enclosed structure. This not only improves heating efficiency and reduces energy consumption, but also avoids the influence of environmental changes on the heating temperature, and is beneficial for maintaining the temperature of the film after heating. The inlet 11 and outlet 12 not only facilitate the entry and exit of the film from the oven 1, but also minimize heat loss from the oven 1, maintain a relatively constant heating temperature inside the oven 1, and facilitate temperature adjustment.

[0035] The oven 1 is equipped with a heat source, such as a heating rod 14, which provides heat to raise the internal temperature of the oven. When two or more layers of film 31 enter the oven 1, they can be heated to a predetermined temperature. The heat source can also be a resistance wire, an infrared heating device, a medium-wave heating plate, etc., depending on the material properties and process requirements of the film 31 to be heated.

[0036] After being heated, two or more layers of film 31 leave the oven 1 through the outlet 12 and enter the seam between the first pressure roller 21 and the second pressure roller 22. The first pressure roller 21 and the second pressure roller 22 apply pressure to the two or more layers of film 31, and the two or more layers of film 31 are bonded together to form a composite film 32.

[0037] The heating time of the two or more layers of film 31 in the oven 1 and the lamination speed of the first pressure roller 21 and the second pressure roller 22 can be set or optimized according to the material characteristics and process requirements of the film 31 to be heated, as well as the material characteristics and process requirements of the composite film 32. Therefore, in this embodiment, a film feeding device 41 and a film receiving device 42 are also provided. The two or more layers of film 31 to be laminated are placed on their respective film feeding devices 41. The front end of the film 31 passes through the oven 1 and the seam and is then fixed on the film receiving device 42. The film receiving device 42 provides power to pull the film out of the oven 1 and the seam. Thus, by controlling the traction speed of the film receiving device 42, the heating time of the two or more layers of film 31 in the oven 1 and the lamination speed of the first pressure roller 21 and the second pressure roller 22 can be further controlled. Of course, the first pressure roller 21 and the second pressure roller 22 will also generate a certain traction force on the film when they roll two or more layers of film 31. This can coordinate the rolling traction force and the film taking device 42 traction force at the same time, so that the film is always at an ideal forward speed during the heating and rolling process.

[0038] The membrane composite device described in this utility model can be used for various membranes that need to be composited, and is not limited to PTFE membranes or PTFE filter membranes. The specific heating parameters and rolling parameters are determined according to the membrane to be composited and the material and process requirements of the composite membrane.

[0039] This embodiment uses a PTFE membrane for filtration as an example to further illustrate the technical solution of this utility model. As one implementation, a membrane composite device for composite PTFE membranes is used to composite two layers of PTFE membrane 31 into a composite PTFE membrane 32. This membrane composite device includes an oven 1, a first pressure roller 21, a second pressure roller 22, a first membrane unwinding device 411, a second membrane unwinding device 412, and a membrane winding device 42. A heating rod 14 is installed inside the oven to control the temperature inside the oven. The first membrane unwinding device 411 and the second membrane unwinding device 412 serve as the unwinding device 41, and the membrane winding device 42 serves as the winding device 42. The oven 1 has two inlets 11 on the left side and one outlet 12 on the right side. Before lamination, the two layers of PTFE film 31 are respectively rolled up by the previous process and placed on the first film unwinding device 411 and the second film unwinding device 412. When the PTFE film 31 is pulled or stretched, the first film unwinding device 411 and the second film unwinding device 412 can release the PTFE film 31. The PTFE film 31 on the first film unwinding device 411 and the second film unwinding device 412 enter the drying oven 1 through the upper and lower inlets 11 respectively. It is heated in the drying oven 1, and then leaves the drying oven 1 from the outlet 12. After passing through the seam between the first pressure roller 21 and the second pressure roller 22, it is fixed to the film winding device 42. The film winding device 42 provides traction power to the PTFE film 32 by rotating the winding drum, and winds up the laminated PTFE film 32. After being heated, the two layers of PTFE membrane 31 leave the oven 1 from the outlet 12 and enter the pressure gap between the first pressure roller 21 and the second pressure roller 22. The first pressure roller 21 and the second pressure roller 22 apply pressure to the two layers of PTFE membrane 31, and roll the two layers of PTFE membrane 31 together to form a composite PTFE membrane 32.

[0040] In this invention, the oven 1 can be rectangular or square, etc. The oven 1 is equipped with an inlet 11 and an outlet 12. The two or more layers of film 31 to be laminated enter the oven 1 through the inlet 11, are heated inside the oven 1, and then exit through the outlet 12. By providing the film inlet 11 and outlet 12 on the oven 1, the film heating area is made into a relatively enclosed structure. This not only improves heating efficiency and reduces energy consumption, but also avoids the influence of environmental changes on the heating temperature, and is beneficial for maintaining the film's heat after heating. The inlet 11 and outlet 12 not only facilitate the entry and exit of the film from the oven 1, but also minimize heat loss from the oven 1, maintaining a relatively constant heating temperature inside the oven 1, and facilitating temperature adjustment.

[0041] In one implementation, when the heating rod 14 is used as a heat source, several heating rods 14 can be distributed on the top and bottom of the oven, with a PTFE membrane 31 passageway in the middle.

[0042] The first pressure roller 21 and the second pressure roller 22 can both be metal rollers or both be rubber rollers. In a preferred embodiment, the first pressure roller 21 is a metal roller, and the second pressure roller 22 is a rubber roller. In this invention, the metal roller serving as the first pressure roller 21 may or may not have a heating function. Specific optimization is performed according to the technical parameters of the composite film 32.

[0043] In a preferred embodiment, the film to be laminated 31 comprises upper and lower layers, and two inlets 11 are provided on one side of the oven 1. The upper and lower layers of the film to be laminated 31 enter the oven 1 through the two inlets 11 respectively. This better conforms to the forward path of the film to be laminated 31.

[0044] In a preferred embodiment, a guide roller 23 is provided on the outside of the oven 1 near the inlet 11 to guide the film to be laminated 31 into the inlet 11. This allows the film to enter the oven 1 more smoothly without scratching the edge of the inlet 11. Similarly, the guide roller 23 can also be provided on the outside of the oven 1 near the outlet 12. This prevents the heated film to be laminated 31 from scratching the edge of the outlet 12 and allows it to be smoothly guided into the gap between the first pressure roller 21 and the second pressure roller 22.

[0045] With the above structure, the present invention divides the heating process and rolling process of two or more layers of film 31 into two stages, thereby enabling precise control of the heating process and rolling process, improving the performance of the composite film and preventing damage to the composite film.

[0046] It should be understood that, in order to simplify the present invention and help those skilled in the art understand its various aspects, in the above description of exemplary embodiments of the present invention, various features of the present invention are sometimes described in a single embodiment or with reference to a single figure. However, the present invention should not be construed as implying that all features included in the exemplary embodiments are essential technical features of the claims of this patent.

Claims

1. A membrane composite device, characterized in that, Includes an oven (1) and pressure rollers, The oven (1) is used to heat the two or more layers of film (31) to be laminated; The pressure rollers include at least a first pressure roller (21) and a second pressure roller (22), which apply pressure to the two or more layers of film (31) heated in the oven (1) to form a composite film (32).

2. The membrane composite device as described in claim 1, characterized in that, The oven (1) is provided with an inlet (11) and an outlet (12). The two or more layers of film (31) to be laminated enter the oven (1) through the inlet (11), and after being heated in the oven (1), they are output from the outlet (12).

3. The membrane composite device as described in claim 1, characterized in that, The oven (1) is equipped with a heat source to raise the temperature of the oven (1).

4. The membrane composite device as described in claim 3, characterized in that, The heat source is one or more of the following: heating rod (14), resistance wire, infrared heating device, and medium wave heating plate.

5. The membrane composite device according to any one of claims 1 to 4, characterized in that, It also includes a film feeding device (41) and a film taking device (42). The two or more layers of film (31) to be laminated are placed on the corresponding film feeding device (41). The front ends of the two or more layers of film (31) pass through the oven (1) and the seam between the first pressure roller (21) and the second pressure roller (22) and are fixed on the film taking device (42). The film taking device (42) provides traction force.

6. The membrane composite device as described in claim 5, characterized in that, The membrane is a PTFE membrane.

7. The membrane composite device as described in claim 6, characterized in that, By controlling the traction speed of the film taking device (42), the heating time of two or more layers of film (31) in the oven (1) and the bonding speed of the first pressure roller (21) and the second pressure roller (22) on the film are adjusted.

8. The membrane composite device as described in claim 7, characterized in that, The oven has several heating rods (14) distributed inside, with a PTFE membrane passage in the middle.

9. The membrane composite device as described in claim 7, characterized in that, A guide roller (23) is provided on the outside of the oven (1) near the inlet (11) to guide the film (31) to be laminated into the inlet (11).

10. The membrane composite device as described in claim 7, characterized in that, A guide roller (23) is provided outside the oven (1) near the outlet (12) to guide the film to be laminated (31) into the seam between the first pressure roller (21) and the second pressure roller (22).

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