Process for improving the efficiency of graphite firing

Abstract

The application provides a process for improving the efficiency of graphite baking, comprising the following steps: step S1, pre-cutting, pre-cutting a PI film mother roll according to a preset width, any pre-cutting incision being discontinuous in the length direction, to obtain a pre-cut PI film; step S2, reverse winding treatment, to obtain a PI film roll; step S3, carbonization treatment, placing the PI film roll in a carbonization furnace for carbonization treatment, to obtain a carbonized film roll; step S4, graphitization treatment, placing the carbonized film roll in a graphitization furnace for graphitization treatment, to obtain a foamed graphite film roll; and step S5, cutting treatment, to obtain a graphite film roll. The application improves the cutting method, pre-cuts the PI film mother roll, and further improves the loading method during carbonization treatment and graphitization treatment, thereby improving the utilization rate of the baking furnace volume and reducing the cost.

Description

Technical Field

[0001] This invention belongs to the field of graphite firing, and particularly relates to a process method for improving the efficiency of graphite firing. Background Technology

[0002] The biggest cost in graphite firing is energy, which is used to heat the raw materials. This primarily involves carbonization and graphitization heating processes, using firing furnaces, including carbonization and graphitization furnaces. These furnaces have a certain effective volume; however, due to manufacturing limitations, this volume is often underutilized, resulting in waste. Figure 1 The diagram shows a common slitting method used in the prior art, where the PI film master roll is slit into individual PI film rolls, which are then loaded into a furnace for firing. Figure 2 As shown, this is the main furnace loading method in the prior art, which involves loading the furnace according to the specifications of the firing furnace. That is, when loading the slit single rolls of PI film into the furnace, a jig is used to separate each layer of material roll. The jig in this method also occupies part of the firing space, and each layer will generate volume waste, which leads to the inability to effectively utilize the volume of the firing furnace in the graphite production process, resulting in wasted space. Summary of the Invention

[0003] To address at least one technical problem in the prior art, a process method for improving graphite firing efficiency is provided, effectively utilizing the space of the firing furnace and reducing firing costs. To achieve the above technical objectives, the technical solution adopted in this invention is as follows: This invention provides a process method for improving the efficiency of graphite sintering, comprising the following steps: Step S1, pre-cutting: the PI film master roll is pre-cut according to a preset height, and any of the pre-cut cuts are discontinuous in the length direction to obtain the pre-cut PI film. Step S2, rewinding process: The pre-cut PI film obtained in step S1 is rewound on a rewinding machine to obtain PI film rolls. Step S3, carbonization treatment: The PI film roll obtained in step S2 is placed in a carbonization furnace for carbonization treatment to obtain a carbonized film roll. Step S4, graphitization treatment: The carbonized film roll obtained in step S3 is placed in a graphitization furnace for graphitization treatment to obtain a foamed graphite film roll. Step S5: Slitting process. The foamed graphite film roll obtained in step S4 is slitting process to obtain graphite film roll material.

[0004] Further, in step S2, the carbonization process involves placing the PI film roll directly onto the firing fixture in single roll form and moving it to the carbonization furnace for firing.

[0005] Further, in step S2, the carbonization process involves stacking PI film rolls along the width direction, placing them as a whole on the tray of the carbonization fixture, and moving them to the carbonization furnace for firing, wherein any two adjacent PI film rolls are separated by graphite paper.

[0006] Further, in step S3, the graphitization process involves placing the carbonized film roll directly onto the firing fixture in single roll form and moving it to the graphitization furnace for firing. Further, in step S3, the graphitization process involves stacking the carbonized film rolls along the width direction, placing them as a whole on the tray of the graphitization fixture, and moving them to the graphitization furnace for firing, wherein any two adjacent carbonized film rolls are separated by graphite paper.

[0007] The beneficial effects of the technical solution provided by the embodiments of the present invention are as follows: 1) This embodiment of the invention improves the slitting method by pre-slitting the PI film master roll, so that the pre-slitting PI film has a cut portion and a continuous portion. The cut portion ensures that impurities generated in the subsequent carbonization and graphitization processes of the PI film are discharged, and the continuous portion ensures that the PI film does not break during the subsequent carbonization and graphitization processes, thereby effectively supporting the PI film and preventing the PI film from deforming or being damaged due to heat treatment.

[0008] 2) The embodiments of the present invention improve the furnace loading method during carbonization and graphitization treatment, including single roll placement and stacked placement, with the stacks separated by graphite paper. These two furnace loading methods greatly improve the utilization rate of the firing furnace volume, increase the furnace loading amount, and save the firing cost of the carbonization furnace and graphitization furnace. The volume utilization rate of the carbonization furnace or graphitization furnace can be increased by 25-40%, reducing the firing cost. Attached Figure Description

[0009] Figure 1 This is a schematic diagram of the slicing method in the existing technology.

[0010] Figure 2 This is a schematic diagram of the furnace loading method for PI film rolls in the prior art.

[0011] Figure 3 This is a schematic diagram of the first pre-segmentation method in an embodiment of the present invention.

[0012] Figure 4 This is a schematic diagram of the second pre-segmentation method in an embodiment of the present invention.

[0013] Figure 5 This is a schematic diagram of the third pre-slicing method in an embodiment of the present invention.

[0014] Figure 6This is a schematic diagram of the first type of furnace loading for PI film rolls or carbonized film rolls in an embodiment of the present invention.

[0015] Figure 7 This is a schematic diagram of a second type of furnace loading for PI film rolls or carbonized film rolls in an embodiment of the present invention.

[0016] The attached diagram lists the materials represented by each number as follows: 1-Continuous slitting cut in the prior art; 2-Graphite firing fixture; 3-Graphite fixture partition; 4-Graphite fixture core; 5-Slit PI film roll in the prior art; 6-First type of pre-slit PI film roll in this application; 6-Second type of pre-slit PI film roll in this application; 6-Third type of pre-slit PI film roll in this application; 7-Graphite paper. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0018] Furthermore, it should be understood that after reading the contents disclosed in this invention, those skilled in the art can make various alterations or modifications to this invention, and these equivalent forms also fall within the protection scope defined by this invention.

[0019] This invention provides a process method for improving the efficiency of graphite sintering, comprising the following steps: Step S1, pre-cutting: The PI film master roll is pre-cut according to a preset width, and any of the pre-cut cuts are discontinuous in the length direction to obtain the pre-cut PI film. Step S2, rewinding process: The pre-cut PI film obtained in step S1 is rewound on a rewinding machine to obtain PI film rolls. Step S3, carbonization treatment: The PI film roll obtained in step S2 is placed in a carbonization furnace for carbonization treatment to obtain a carbonized film roll. Step S4, graphitization treatment: The carbonized film roll obtained in step S3 is placed in a graphitization furnace for graphitization treatment to obtain a foamed graphite film roll. Step S5: Slitting process. The foamed graphite film roll obtained in step S4 is slitting process to obtain graphite film roll material.

[0020] The PI film master roll is installed onto the slitting equipment and pre-cut by the slitting equipment.

[0021] In any roll of the PI film master roll, the pre-slitting is performed according to a preset width. This preset width is not limited and can be adjusted adaptively as needed. Figure 3 As shown, the pre-splitting can be set to one, two, or more strips, and the width of the PI film after pre-splitting can be the same or different.

[0022] The pre-cut slits are discontinuous along the length direction, as shown in the figure. Along the length direction, there are slit portions and continuous portions. The slit portions ensure that impurities generated during the subsequent carbonization and graphitization processes of the PI film are discharged, while the continuous portions ensure that the PI film does not break during the subsequent carbonization and graphitization processes, thereby effectively supporting the PI film and preventing the PI film from deforming or being damaged due to heat treatment.

[0023] The shape, length, and width of any of the pre-slit portions are not limited. The shape of the slit portion can be dot-shaped, line-shaped, oblong, etc., and the width of the pre-slit portions can be the same or different, and the length of the slit portions can be the same or different.

[0024] It is understandable that the length of the cut and the length of the continuous part can be the same or different.

[0025] In a specific embodiment, such as Figure 3 As shown, the shape of the cut is dot-shaped, and the length of the pre-cut cut portion is the same as the length of the continuous portion.

[0026] In another specific embodiment, such as Figure 4 As shown, the shape of the cut is linear, and the length of the pre-cut cut portion is greater than the length of the continuous portion.

[0027] In yet another specific embodiment, such as Figure 5 As shown, the shape of the cut is a long rectangle, and the length of the pre-cut cut portion is greater than the length of the continuous portion.

[0028] In step S2, the purpose of rewinding is to allow space for the expansion and contraction of the PI film material during the firing process, so as to avoid quality problems such as breakage or deformation caused by internal stress or compression between materials.

[0029] Further, in step S2, the carbonization process involves placing the PI film roll directly onto the firing fixture in single roll form and moving it to the carbonization furnace for firing.

[0030] Further, in step S2, the carbonization process involves stacking PI film rolls along the width direction, placing them as a whole on the tray of the carbonization fixture, and moving them to the carbonization furnace for firing, wherein any two adjacent PI film rolls are separated by graphite paper.

[0031] Further, in step S3, the graphitization process involves placing the carbonized film roll directly onto the firing fixture in single roll form and moving it to the graphitization furnace for firing. Further, in step S3, the graphitization process involves stacking the carbonized film rolls along the width direction, placing them as a whole on the tray of the graphitization fixture, and moving them to the graphitization furnace for firing, wherein any two adjacent carbonized film rolls are separated by graphite paper.

[0032] Since the PI film has undergone pre-slitting, the appropriate PI film roll after pre-slitting and rewinding can be selected directly according to the height of the carbonization furnace during carbonization and graphitization processes.

[0033] When placed in single rolls, the length of a single roll is usually greater than the sum of the lengths of all existing PI film rolls compared to the existing furnace loading method. Therefore, the amount of PI film rolls that can be fired in a single firing increases, reducing the number of firings required for the overall material, saving energy and reducing costs.

[0034] When using a stacking method, it should be noted that at high temperatures, the contact area between the PI film rolls may melt, causing adhesion. Therefore, placing graphite paper between any two adjacent PI film rolls can not only effectively separate the rolls of different PI films and prevent adhesion, but also save space compared to the partitions used in existing fixtures. This allows for full utilization of the space above the fixture, increasing the number of rolls and improving the volume utilization of the firing furnace. Consequently, it can also save on the firing costs of the carbonization and graphitization furnaces. With this placement method, the volume utilization of the carbonization or graphitization furnace can be increased by 25-40%, effectively reducing the number of firing cycles required, resulting in significant cost reduction and efficiency improvement.

[0035] Finally, it should be noted that the above specific embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to examples, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A process for improving the efficiency of graphite firing, characterized in that, Includes the following steps: Step S1, pre-cutting: The PI film master roll is pre-cut according to a preset width. Any of the pre-cut cuts is discontinuous in the length direction and includes a cut portion and a continuous portion along the length direction. The shape of the cut portion is one of round, linear, or oblong, to obtain the pre-cut PI film. Step S2, rewinding process: The pre-cut PI film obtained in step S1 is rewound on a rewinding machine to obtain PI film rolls. Step S3, carbonization treatment: The PI film roll obtained in step S2 is placed in a carbonization furnace for carbonization treatment to obtain a carbonized film roll. The carbonization process involves stacking PI film rolls along their width, placing them as a whole on the tray of a carbonization fixture, and moving them to the carbonization furnace for firing. Graphite paper is used to separate any two adjacent PI film rolls. Step S4, graphitization treatment: The carbonized film roll obtained in step S3 is placed in a graphitization furnace for graphitization treatment to obtain a foamed graphite film roll. The graphitization process involves stacking the carbonized film rolls along the width direction, placing them as a whole on the tray of the graphitization fixture, and moving them to the graphitization furnace for firing. Graphite paper is used to separate any two adjacent carbonized film rolls. Step S5: Slitting process. The foamed graphite film roll obtained in step S4 is slitting process to obtain graphite film roll material.

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