Method and system for continuously producing composite fiber paper

Abstract

The invention discloses a method and system for continuously producing composite fiber paper. The system comprises a pulping unit, a pulp distributing unit, a graphite paper feeding unit, a collecting unit, a vacuum unit, a conveying unit and a control unit. According to the system, continuous production of the composite fiber paper is achieved, the production efficiency is improved, the automation degree of equipment is high, the labor intensity of workers is reduced, the labor cost is reduced, further, the problem of product quality fluctuation caused by manual operation is solved, the obtained composite fiber paper product is high in consistency, and the product quality is stable and controllable.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of composite fiber paper, in particular to a method and system for continuously producing composite fiber paper. BACKGROUND

[0002] At present, the production mode of composite fiber paper is still trapped in the limitations of intermittent operation, and the whole process relies on manual intervention and is fragmented. Each product needs to repeat a complete and tedious process, and its inherent defects are particularly prominent in production practice. The raw material allocation and quantitative scooping need to be completed manually in the pulp preparation stage, and then the slurry is transferred to a plastic bucket. In the forming stage, non-woven fabric is laid on the filtration platform by manual operation, then the slurry is poured and the first filtration is started manually. After preliminary forming, a single-side adhesive film is covered manually, and the second filtration is completed by operating the button again. Finally, the product is taken out manually.

[0003] This intermittent mode of "manual operation-equipment operation-shutdown waiting" directly leads to three major problems: first, workers need to monitor all process nodes throughout the process, and repeat mechanical actions such as laying cloth, pouring slurry, covering film, and taking out products, which is extremely labor-intensive. Second, the shutdown between processes and manual transfer cause the continuity of production to be broken, the production cycle is lengthened, and the production efficiency is low. Third, the labor cost accounts for a high proportion of the total production cost, and the uncertainty of manual operation may also cause product quality fluctuations, resulting in poor product consistency and unstable quality. SUMMARY

[0004] The present application aims to at least partially solve one of the problems in the related art. To this end, it is an object of the present application to propose a method and system for continuously producing composite fiber paper.

[0005] In one aspect of the present application, a system for continuously producing composite fiber paper is proposed. The system comprises:

[0006] a pulp preparation unit for providing a fiber slurry;

[0007] a cloth slurry unit for covering the fiber slurry with the non-woven fabric to form a first fiber paper;

[0008] a graphite paper feeding unit for coating the graphite paper with glue to form a graphite paper with glue;

[0009] a collection unit for cutting and collecting the second fiber paper after the first fiber paper and the graphite paper with glue are compounded, to obtain a composite fiber paper;

[0010] a vacuum unit for filtering the liquid on the non-woven fabric;

[0011] a conveying unit, which provides conveying power for the distributing unit, the graphite paper feeding unit, and the collecting unit;

[0012] a control unit, which is used for controlling the working of the pulp preparation unit, the distributing unit, the graphite paper feeding unit, the vacuum unit, the conveying unit, and the collecting unit.

[0013] In the second aspect of the present application, a method for continuously producing composite fiber paper by using the system described in the first aspect of the present application is provided. The method comprises:

[0014] (1) mixing fibers and water and feeding them into the pulp preparation unit to obtain a fiber slurry;

[0015] (2) compounding the fiber slurry and the non-woven fabric through the distributing unit to obtain a first fiber cloth;

[0016] (3) compounding the graphite paper and the glue through the graphite paper feeding unit to obtain a graphite paper coated with glue;

[0017] (4) compounding, cutting, and collecting the first fiber cloth and the graphite paper coated with glue through the collecting unit to obtain the composite fiber paper.

[0018] The present application has the following advantages:

[0019] (1) The continuous production of the composite fiber paper is realized, and the production efficiency is improved;

[0020] (2) The degree of automation of the equipment is high, the labor intensity of the workers is reduced, and the labor cost is reduced;

[0021] (3) The product quality fluctuation caused by human operation is solved, and the consistency of the composite fiber paper produced by the continuous production is high, and the product quality is stable and controllable.

[0022] Additional aspects and advantages of the present application will be in part apparent and in part pointed out hereinafter. BRIEF DESCRIPTION OF DRAWINGS

[0023] The above and / or additional aspects and advantages of the present application will become apparent and be readily appreciated from the following description, including the accompanying drawings, in which:

[0024] Figure 1 is a schematic diagram of a system for continuously producing composite fiber paper according to one specific embodiment of the present application;

[0025] Wherein, 101 - equipment control cabinet, 102 - button box; 201 - stirring tank, 202 - liquid level sensor, 203 - electric diaphragm pump, 204 - flow meter, 205 - pneumatic ball valve, 206 - pulp pipe; 301 - non-woven fabric roll, 302 - first flattening wheel, 303 - cloth pulp pipe, 304 - homogenizing wheel, 305 - second flattening wheel, 306 - slurry storage tank; 601 - vacuum filter, 602 - air exhaust pipe, 603 - vacuum pump, 604 - water storage tank; 701 - transmission wheel, 702 - conveying belt; 401 - graphite paper roll, 402 - brush pair of rollers, 403 - glue box, 404 - third flattening wheel; 501 - transmission pair of rollers, 502 - automatic paper cutting device, 503 - finished product collecting device. DETAILED DESCRIPTION

[0026] Embodiments of the present application are described in detail below with reference to examples illustrated in the accompanying drawings, in which the same or similar components have the same or similar designations throughout the various figures. The embodiments described below are examples for explaining the present application and are not intended to be limiting of the present application.

[0027] Further, the terms "first", "second", "third", "fourth", "fifth", "sixth" are used only for descriptive purposes and are not to be construed as indicating or implying relative importance or a specific order of importance of the indicated technical features. Thus, features having a "first", "second", "third", "fourth", "fifth", "sixth" designation can implicitly or explicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, for example, two, three, etc., unless otherwise specifically defined.

[0028] In one aspect of the present application, a system for continuously producing a composite fiber paper is provided. As shown in Figure 1 The system comprises:

[0029] A pulp preparation unit for providing a fiber slurry;

[0030] A cloth pulp preparation unit for combining the fiber slurry with the non-woven fabric to form a first fiber paper;

[0031] A graphite paper feeding unit for gluing the graphite paper to form a glued graphite paper;

[0032] A collecting unit for cutting and collecting the second fiber paper after the first fiber paper and the glued graphite paper are combined to obtain a composite fiber paper;

[0033] A vacuum unit for filtering the liquid on the non-woven fabric;

[0034] The transmission unit provides transmission power for the pulping unit, the graphite paper feeding unit, and the collection unit;

[0035] The control unit is used to control the operation of the pulping unit, the pulp distribution unit, the graphite paper feeding unit, the vacuum unit, the transmission unit, and the collection unit.

[0036] In some embodiments, the pulping unit includes a mixing tank 201, a level sensor 202, an electric diaphragm pump 203, a flow meter 204, a valve 205, and a pulp delivery pipe 206.

[0037] Specifically, the fiber and water are added to the mixing tank 201 and stirred evenly to form a fiber slurry. The fiber slurry is transported through the slurry delivery pipe 206, and the electric diaphragm pump 203 provides power for the transport of the slurry in the mixing tank 201. The flow meter 204 monitors the slurry delivery rate, and the control system controls the opening and closing of the valve 205 based on the monitoring results of the flow meter 204. The liquid level sensor 202 is used to monitor the liquid level of the slurry in the mixing tank 201. When the liquid level of the slurry in the mixing tank 201 is lower than the set value, it will be transmitted to the control system through the liquid level sensor 202, and the control system will issue an alarm.

[0038] In some embodiments, the sizing unit includes, in sequence according to the direction of nonwoven fabric travel, a nonwoven fabric roll 301, a first flattening roller 302, a sizing pipe 303, a homogenizing roller 304, and a second flattening roller 305.

[0039] In some embodiments, one end of the slurry delivery pipe 206 is connected to the outlet end of the mixing tank 201, and the other end is connected to the slurry distribution pipe 303.

[0040] Specifically, along the direction of nonwoven fabric travel, it first passes through the first flattening roller 302, which flattens, stretches, and smooths the rolled nonwoven fabric so that the fiber slurry is evenly distributed. Then, the slurry tube 303 releases the fiber slurry onto the nonwoven fabric. The homogenizing roller 304 prevents the fiber slurry from accumulating and evenly disperses it onto the nonwoven fabric. Finally, the second flattening roller 305 tightly adheres the filtered fibers to the nonwoven fabric.

[0041] In some embodiments, the slurry distribution unit further includes a slurry storage tank 306, and the slurry distribution pipe 303, the homogenizing wheel 304, and the second flattening wheel 305 are all disposed inside the slurry storage tank 306.

[0042] In some embodiments, the graphite paper feeding unit includes a graphite paper roll 401, a brush roller 402, and a third flattening roller 403 in the direction of graphite paper travel, wherein one of the brush rollers 402 is placed in a glue box 404.

[0043] In some embodiments, the first fiber paper and the glue-coated graphite paper are flattened by the third flattening roller 403 to form a second fiber paper.

[0044] Specifically, the glue box 404 has a hole structure in the area where the two brush rollers contact. The brush roller in the glue box 404 picks up glue and evenly applies it to the lower surface of the graphite paper. Thus, the glue bonds the graphite paper and the first fiber cloth to form a second fiber paper. The third flattening roller 403 tightly presses the graphite paper with glue onto the first fiber cloth.

[0045] In some embodiments, the collection unit includes a transmission pair of rollers 501, an automatic cutting device 502, and a finished product collection device 503 according to the direction in which the second fiber paper travels.

[0046] Specifically, the transmission pair of rollers 501 rotate relatively to transport and compress the second fiber paper. Then, the automatic cutting device 502 cuts the second fiber paper according to requirements. Finally, the finished product collection device 503 collects the cut composite fiber paper.

[0047] In some embodiments, the control system includes a device control cabinet 101 and a button box 102.

[0048] In some embodiments, the vacuum unit includes a vacuum filter 601, an air suction pipe 602, a vacuum pump 603, and a water storage tank 604.

[0049] Specifically, the lower part of the vacuum filter 601 is connected to the vacuum pump 603 through the air suction pipe 602. Opening the vacuum pump 603 and utilizing the porous properties of non-woven fabric achieve the effect of filtration, realize solid-liquid separation, and make the fiber adhere to the non-woven fabric. At the same time, the water after vacuum filtration is collected in the water storage tank 604 for reuse.

[0050] In some embodiments, the transmission device includes a transmission roller 701 and a transmission belt 702.

[0051] In some embodiments, the transmission belt is a porous transmission belt 701. The porous properties are conducive to the penetration of liquid during solid-liquid separation, ensuring that the fiber remains on the non-woven fabric.

[0052] In the second aspect of the present application, a method for continuously producing composite fiber paper using the system described in the first aspect of the present application is proposed. The method includes:

[0053] (1) mixing and feeding fibers and water into the pulping unit to obtain a fiber slurry;

[0054] (2) the fiber slurry and non-woven fabric are compounded through the cloth pulp unit to obtain a first fiber cloth;

[0055] (3) The graphite paper and the glue are compounded by the graphite paper feeding unit to obtain the graphite paper coated with glue;

[0056] (4) The first fiber cloth and the graphite paper coated with glue are compounded, cut and collected by the collecting unit to obtain the composite fiber paper.

[0057] In some embodiments, the conveying speed v1 of the non-woven fabric is 0.4-1.0 m / s, for example, 0.5 m / s, 0.6 m / s, 0.7 m / s, 0.8 m / s, 0.9 m / s, etc.

[0058] In some embodiments, the conveying speed v3 of the graphite paper is 0.4-1.0 m / s, for example, 0.5 m / s, 0.6 m / s, 0.7 m / s, 0.8 m / s, 0.9 m / s, etc.

[0059] In some embodiments, the speed v2 of the fiber slurry in the slurry pipe is 0.5-1.2 m / s, for example, 0.6 m / s, 0.7 m / s, 0.8 m / s, 0.9 m / s, 1.0 m / s, 1.1 m / s, etc.

[0060] In some embodiments, in step (1), the concentration of the fiber slurry is 3-8 wt%, for example, 4 wt%, 5 wt%, 6 wt%, 7 wt%.

[0061] In some embodiments, the content of glue in the graphite paper coated with glue is 5-15 g / m2, for example, 6 g / m2, 7 g / m2, 8 g / m2, 9 g / m2, 10 g / m2, 11 g / m2, 12 g / m2, 13 g / m2, 14 g / m2, etc. 2 2 2 2 2 2 2 2 2

[0062] In some embodiments, the fiber is one or more of ceramic fiber, aerogel fiber, carbon fiber or glass fiber.

[0063] In some embodiments, the glue comprises one or more of epoxy resin glue, polyurethane glue, acrylate glue.

[0064] The present application is described below with reference to specific examples, it should be noted that these examples are merely descriptive and do not limit the present application in any way.

[0065] Example 1

[0066] As described above, the present application provides a method for preparing a composite fiber paper, which comprises the following steps: Figure 1 ​​​​​​​​​The shown system continuously produces composite fiber paper, and the specific steps are as follows:

[0067] (1) The aerogel fibers and water are mixed and put into the pulp preparation unit, and the fiber slurry concentration is controlled to be 5% so as to obtain a fiber slurry;

[0068] (2) The fiber slurry and the non-woven fabric are compounded through the cloth pulp unit to obtain a first fiber cloth;

[0069] (3) The graphite paper and the epoxy resin glue are compounded through the graphite paper feeding unit to obtain a glue-coated graphite paper;

[0070] (4) The first fiber cloth and the glue-coated graphite paper are compounded, cut and collected through the collection unit to obtain a composite fiber paper.

[0071] Among them, the transmission speed v1 of the non-woven fabric is 0.6 m / s, the conveying speed v3 of the graphite paper is 0.6 m / s, the speed v2 of the fiber slurry in the pulp conveying pipe is 0.7 m / s, the concentration of the fiber slurry is 5 wt%, and the glue content in the glue-coated graphite paper is 8 g / m 2 .

[0072] Example 2

[0073] The transmission speed v1 of the non-woven fabric is 0.8 m / s, the speed v2 of the fiber slurry in the pulp conveying pipe is 0.9 m / s, and the others are the same as in Example 1.

[0074] Example 3

[0075] The transmission speed v1 of the non-woven fabric is 0.5 m / s, the speed v2 of the fiber slurry in the pulp conveying pipe is 0.6 m / s, and the others are the same as in Example 1.

[0076] Comparative Example 1

[0077] The transmission speed v1 of the non-woven fabric is 0.3 m / s, the speed v2 of the fiber slurry in the pulp conveying pipe is 0.7 m / s, and the others are the same as in Example 1.

[0078] Comparative Example 2

[0079] The transmission speed v1 of the non-woven fabric is 0.6 m / s, the speed v2 of the fiber slurry in the pulp conveying pipe is 0.4 m / s, and the others are the same as in Example 1.

[0080] The composite fiber paper obtained in each example and comparative example is tested, and the test method is as follows:

[0081] (1) Quantitative determination: according to the standard of GB / T 451.2-2002 "Determination of the mass per unit area of paper and paperboard", the weight of the composite fiber paper per unit area is detected;

[0082] (2) Tensile strength determination: According to GB / T 12914-2018 "Determination of tensile strength of paper and board - Constant rate of elongation method", the test was carried out to evaluate the mechanical properties of paper;

[0083] (3) Interlayer bonding strength determination: According to GB / T 26203-2010 "Determination of interlayer bonding strength of paper and board", the test was carried out to determine the adhesion strength of the composite interlayer.

[0084] The test results are shown in Table 1 below:

[0085] Table 1

[0086] Group Quantitative (g / m 2 ) Tensile strength (MPa) Interlaminar bond strength (N / m) Example 1 125 18.6 128 Example 2 128 19.2 132 Example 3 126 18.9 130 Comparative Example 1 152 15.3 95 Comparative Example 2 98 12.6 82

[0087] In the description of the present specification, the description referring to the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Also, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. Furthermore, the person skilled in the art can combine and combine the different embodiments or examples described in the present specification and the features of the different embodiments or examples without contradiction.

[0088] Although the embodiments of the present application have been shown and described above, it is understood that the above-described embodiments are exemplary and are not to be construed as limiting the present application, and those skilled in the art can make changes, modifications, replacements and variations to the above-described embodiments within the scope of the present application.

Claims

1. A system for continuously producing a composite fiber paper, characterized by, The system comprises: a pulp preparation unit for providing a fiber slurry; a pulp distribution unit for forming a first fiber paper by combining the fiber slurry with the non-woven fabric; a graphite paper feeding unit for forming a graphite paper coated with glue by combining the graphite paper with glue; a collection unit for cutting and collecting a second fiber paper after the first fiber paper and the graphite paper coated with glue are combined; a vacuum unit for filtering the liquid on the non-woven fabric; a transmission unit for providing transmission power for the pulp distribution unit, the graphite paper feeding unit, and the collection unit; a control unit for controlling the operation of the pulp preparation unit, the pulp distribution unit, the graphite paper feeding unit, the vacuum unit, the transmission unit, and the collection unit.

2. The system of claim 1, wherein, The pulp preparation unit comprises a stirring tank, a liquid level sensor, an electric diaphragm pump, a flow meter, a valve, and a pulp pipe; and / or The pulp distribution unit comprises, in sequence according to the running direction of the non-woven fabric, a non-woven fabric roll, a first flattening roller, a pulp distribution pipe, a homogenizing roller, and a second flattening roller; and / or One end of the pulp pipe is connected to the stirring tank, and the other end is connected to the pulp distribution pipe; and / or The pulp distribution unit further comprises a slurry storage tank, and the pulp distribution pipe, the homogenizing roller, and the second flattening roller are arranged inside the slurry storage tank.

3. The system of claim 1, wherein, The graphite paper feeding unit comprises, in sequence according to the running direction of the graphite paper, a graphite paper roll, a brush pair of rollers, and a third flattening roller, wherein one brush roller in the brush pair of rollers is arranged in a glue box; and / or The first fiber paper and the graphite paper coated with glue are flattened by the third flattening roller to form a second fiber paper.

4. The system of claim 3, wherein, The collection unit comprises, in sequence according to the running direction of the second fiber paper, a transmission pair of rollers, an automatic cutting device, and a finished product collection device; The control system comprises an equipment control cabinet and a button box.

5. The system of claim 1, wherein, The vacuum unit comprises a vacuum filter, an air exhaust pipe, a vacuum pump, and a water storage tank; and / or The transmission device comprises a transmission roller and a transmission belt.

6. A method for continuous production of fibrous paper using the system according to any one of claims 1 to 5, characterized in that, The method comprises: (1) mixing fibers and water and feeding them into a pulp preparation unit to obtain a fiber slurry; (2) combining the fiber slurry and a non-woven fabric by a pulp distribution unit to obtain a first fiber paper; (3) combining a graphite paper and glue by a graphite paper feeding unit to obtain a graphite paper coated with glue; (4) combining, cutting, and collecting the first fiber paper and the graphite paper coated with glue by a collection unit to obtain a composite fiber paper.

7. The method of claim 6, wherein, The ratio of the fiber slurry conveying speed v2 in the pulp pipe to the transmission speed v1 of the non-woven fabric is 0.8-1.

2.

8. The method of claim 6, wherein, The fiber slurry conveying speed v2 in the pulp pipe is 0.5-1.2 m / s; and / or The transmission speed v1 of the non-woven fabric is 0.4-1.0 m / s; and / or The graphite paper conveying speed v3 is 0.4-1.0 m / s.

9. The method of claim 6, wherein, In step (1), the concentration of the fiber slurry is 3-8 wt%; and / or In step (3), the glue content in the glue-coated graphite paper is 5-15 g / m 2 .

10. The method of claim 6, wherein, The fibers are one or more of ceramic fibers, aerogel fibers, carbon fibers, or glass fibers; and / or The glue comprises one or more of epoxy resin glue, polyurethane glue, and acrylate glue.

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