Graphite sleeve for sintering of pi roll film
By fixing the end of the PI roll film with a graphite sleeve and providing uniform heating, the deformation problem of the PI roll film during high-temperature sintering was solved, and the homogeneity conversion rate of the graphite film was improved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SHENZHEN STONEPLUS THERMAL MANAGEMENT TECHNOLOGIES LIMITED
- Filing Date
- 2025-07-10
- Publication Date
- 2026-06-26
AI Technical Summary
PI roll film is prone to irregular deformation during high-temperature sintering, making it impossible to form a homogeneous graphite film.
Design a graphite sleeve comprising a cylinder and a fixing groove penetrating the side wall for fixing the end of a PI roll film, and possessing intrinsic thermal and electrical conductivity properties, enabling uniform heating of the PI roll film during sintering.
Reducing the irregular deformation of PI roll film improves the conversion rate of PI roll film to form homogeneous graphite film during sintering.
Smart Images
Figure CN224415745U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of artificial graphite film production, and in particular to a graphite sleeve for sintering and fixing PI roll film. Background Technology
[0002] As is well known, graphite film (also known as graphite heat dissipation film or thermally conductive graphite sheet) is a high thermal conductivity nanocomposite material that is widely used in consumer electronics, communication equipment, new energy vehicles and other fields.
[0003] The process of PI roll film firing to produce artificial graphite involves the following steps: PI raw material slitting → PI unwinding → PI roll carbonization → graphitization → rewinding → calendering. This process is inseparable from the use of tooling fixtures.
[0004] However, in the existing tooling and fixtures, the PI roll film is first unwound and placed on the graphite plate of the tooling and fixture, then the graphite rod core is inserted, and then they are placed into the carbonization furnace and graphitization furnace in sequence for the corresponding carbonization and graphitization sintering processes. This causes the PI roll film to deform irregularly during the high-temperature sintering process and cannot form a homogeneous body.
[0005] Therefore, there is an urgent need for a graphite sleeve for sintering and fixing PI roll film to overcome the above-mentioned defects. Utility Model Content
[0006] The purpose of this invention is to provide a graphite sleeve for fixing PI roll film during sintering, so as to improve the conversion rate of PI roll film forming a homogeneous graphite film during the sintering process.
[0007] To achieve the above objectives, the graphite sleeve for sintering and fixing PI roll film of this utility model includes a cylinder for fitting around or inside the PI roll film and a fixing groove formed on the side wall of the cylinder and arranged through the cylinder in the axial direction, the fixing groove being used to fix the end of the PI roll film.
[0008] Compared with the prior art, by using a fixing groove opened on the side wall of the cylinder and arranged through the cylinder in an axial direction, the end of the PI roll film is fixed in the fixing groove and constrained by the cylinder before sintering, reducing the irregular deformation of the PI roll film during the sintering process. In addition, since the graphite sleeve of this invention has intrinsic thermal and electrical conductivity, it can heat the PI roll film from the outside or inside during the PI roll film sintering process, improving the heating uniformity of the PI roll film, and thus improving the conversion rate of the PI roll film to form a homogeneous graphite film during the sintering process.
[0009] Preferably, the fixing groove is also arranged through the inner and outer directions of the cylinder, so that the cylinder is an open ring in the circumferential direction.
[0010] Preferably, the cylinder has a first end and a second end spaced apart axially from each other. The first end has a first recessed annular groove arranged circumferentially around the cylinder, which forms a convex ring structure with a reduced outer diameter at the first end. The second end has a second recessed annular groove arranged circumferentially around the cylinder and used to enlarge the inner diameter of the second end. The dimensions of the second recessed annular groove and the convex ring structure are matched. The first end of the cylinder in one graphite sleeve is sleeved together with the second end of the cylinder in another graphite sleeve by means of the cooperation of the convex ring structure and the second recessed annular groove.
[0011] Preferably, the first end is provided with a positioning part; the second end is provided with a fitting part that is aligned with the positioning part in the axial direction of the cylinder; the fixing grooves on the two cylinders that are sleeved together are aligned in the axial direction of the cylinder by means of the cooperation of the positioning part and the fitting part.
[0012] Preferably, the positioning part and the fitting part are both arranged to extend circumferentially along the cylinder.
[0013] Preferably, the positioning part is located at the center of the convex ring structure in the circumferential direction of the convex ring structure.
[0014] Preferably, the positioning part is a notch formed in the convex ring structure, and the fitting part is a partition structure that separates the second sinking ring groove.
[0015] Preferably, the notch is square.
[0016] Preferably, the end face of the convex ring structure is a flat surface perpendicular to the axial direction of the cylinder, and the cylinder has a mating surface parallel to the end face of the convex ring structure at the position used to define the second sinking ring groove.
[0017] Preferably, the cylindrical body is annular. Attached Figure Description
[0018] Figure 1 This is a perspective view of the graphite sleeve used for sintering and fixing PI roll film according to this utility model.
[0019] Figure 2 yes Figure 1 The graphite sleeve shown is viewed in a plan view in the opposite direction to arrow A.
[0020] Figure 3 Is Figure 2 The above shows the state diagram of the PI film and graphite rod core.
[0021] Figure 4 yes Figure 1 The graphite sleeve shown is viewed from the outside in.
[0022] Figure 5 It is along Figure 4 Internal view of the section cut along the BB line.
[0023] Figure 6 yes Figure 1 The graphite sleeve shown is a three-dimensional view from another angle.
[0024] Figure 7 This is a diagram showing the state of two graphite sleeves of this utility model being fitted together axially.
[0025] Figure 8 yes Figure 7 A floor plan viewed from the outside in.
[0026] Figure 9 It is along Figure 8 Internal view of the section cut along the CC line. Detailed Implementation
[0027] To explain the technical content and structural features of this utility model in detail, the following description is provided in conjunction with the embodiments and accompanying drawings.
[0028] Please see Figure 1 , Figure 3 , Figure 4 and Figure 5 The graphite sleeve 100 of this utility model includes a cylindrical body 10 and a fixing groove 20. The cylindrical body 10 is used to fit over the PI roll film 200, and the fixing groove 20 is formed on the side wall 11 of the cylindrical body 10. The fixing groove 20 is arranged through the cylindrical body 10 in the axial direction and is used to fix the outer end 210 of the PI roll film 200. (See attached diagram). Figure 3 As shown.
[0029] Therefore, before sintering the PI roll film 200, the PI roll film 200 is first fitted over the graphite rod core 300, and then the graphite sleeve 100 of this utility model is fitted over the PI roll film 200, and the outer end 210 of the PI roll film 200 is fixed in the fixing groove 20 on the cylinder 10, as shown in the figure. Figure 3 As shown. Specifically, at Figure 1 , Figure 2 , Figure 3 and Figure 6 In this example, the fixing groove 20 is also arranged through the inner and outer directions of the cylinder 10, so that the cylinder 10 is circumferentially (see, for example, see...). Figure 2 The PI roll 200 is open-loop in either the clockwise or counterclockwise direction. This design makes it easier for operators to fix the outer end 210 of the PI roll 200 into the fixing groove 20 on the cylinder 10, and also facilitates the processing and fabrication of the fixing groove 20 on the cylinder 10. Furthermore, in... Figure 1 , Figure 2 , Figure 3 and Figure 6 In this example, the cylinder 10 is annular, so that the graphite sleeve 100 of this invention is a circular sleeve; obviously, depending on actual needs, the shape of the cylinder 10 can also be other shapes well known in the art, therefore it is not specified. Figure 1 , Figure 2 , Figure 3 and Figure 6 The above is for reference only. For more details, see the description below.
[0030] Combination Figures 1 to 6 As an example, the cylinder 10 has a first end 12 and a second end 13 spaced apart axially from each other. The first end 12 has a circumferentially oriented portion (see, for example, [reference needed]). Figure 2 A first recessed annular groove 121 (arranged clockwise or counterclockwise) forms a convex ring structure 122 with a reduced outer diameter at the first end 12. A second recessed annular groove 131 is formed on the second end 13, arranged circumferentially around the cylinder 10 and used to expand the inner diameter of the second end 13. The dimensions of the second recessed annular groove 131 and the convex ring structure 122 are matched. Therefore, by means of the cooperation of the convex ring structure 122 and the second recessed annular groove 131, the first end 12 of the cylinder 10 in one graphite sleeve 100 is sleeved with the second end 13 of the cylinder 10 in another graphite sleeve 100, as shown in the figure. Figures 7 to 9 As shown; this allows for the infinite stacking of the graphite sleeve 100 of this invention, which on the one hand increases the reusability of the graphite sleeve 100 of this invention, and on the other hand allows the graphite sleeve 100 of this invention to fix the outer end 210 of PI roll film 200 of different widths through the stacking of quantities.
[0031] Combination Figure 1 and Figure 6 As an example, a positioning part 1221 is provided on the first end 12. Alternatively, as an example, the positioning part 1221 extends circumferentially along the cylinder 10, as shown in the figure. Figure 2 As shown, this is to facilitate the manufacture of the positioning part 1221; obviously, depending on actual needs, the positioning part 1221 can also extend in other directions, so it is not shown in the figure. Figure 2 The details shown are for illustrative purposes only. The second end 13 is provided with a mounting portion 132 aligned axially with the positioning portion 1221 on the cylinder 10. Optionally, as an example, the mounting portion 132 extends circumferentially along the cylinder 10, as shown in the diagram. Figure 6 As shown, this is to facilitate the manufacture of the fitting part 132; obviously, depending on actual needs, the fitting part 132 can also extend in other directions, so it is not shown in the figure. Figure 6As shown, the positioning part 1221 and the fitting part 132 cooperate to align the fixing grooves 20 on the two sleeved cylinders 10 in the axial direction of the cylinders 10. Therefore, when the width of the PI roll film 200 increases, two sleeved graphite sleeves 100 can be fitted over the wider PI roll film 200. Since the fixing grooves 20 on the two sleeved cylinders 10 are aligned in the axial direction of the cylinders 10, it is easier for the operator to fix the outer end 210 of the PI roll film 200 in the fixing grooves 20 on all the sleeved cylinders 10 when multiple graphite sleeves 50 are fitted together.
[0032] In order to reduce the impact of the positioning part 1221 on the strength of the convex ring structure 122 due to its location on the convex ring structure 122, in Figure 2 In this example, the positioning part 1221 is located at the center of the convex ring structure 122 in the circumferential direction; furthermore, the positioning part 1221 is a notch formed in the convex ring structure 122, which may be, for example, but not limited to, a square shape. Correspondingly, the fitting part 132 is a partition structure that separates the second recessed ring groove 131. To ensure that the two graphite sleeves 100 fitted together have a face-to-face fit in the axial direction of the cylinder 10, in... Figures 1 to 6 In this example, the end face 1222 of the convex ring structure 122 is a flat surface perpendicular to the axial direction of the cylinder 10. The cylinder 10 has a mating surface 1311 parallel to the end face of the convex ring structure 122 at the position used to define the second recessed ring groove 131. Therefore, when two graphite sleeves 100 of this invention are sleeved together, the mating surface 1311 in one graphite sleeve 100 and the end face 1222 in the other graphite sleeve 100 are in a face-to-face fit, as shown in the figure. Figure 9 As shown.
[0033] Compared with the prior art, by means of a fixing groove 20 formed on the side wall 11 of the cylinder 10 and arranged through the cylinder 10 in an axial direction, the outer end 210 of the PI roll film 200 is fixed in the fixing groove 20 on the cylinder 10 before sintering, and is constrained by the cylinder 10, thereby reducing the irregular deformation of the PI roll film 200 during the sintering process; and because the graphite sleeve 100 of this invention has intrinsic thermal and electrical conductivity, the graphite sleeve 100 of this invention can heat the PI roll film 200 from the outside of the PI roll film 200 during the sintering process, improving the heating uniformity of the PI roll film 200, thereby improving the conversion rate of the PI roll film 200 to form a homogeneous graphite film during the sintering process.
[0034] It should be noted that PI roll film 200 refers to a rolled polyimide film. Additionally, the direction indicated by arrow A in the attached diagram, and the opposite direction, represent the axial direction of the cylinder 10. Furthermore, it should be noted that although... Figure 3 The diagram shows the cylinder 10 fitted outside the PI roll film 200. Clearly, depending on actual needs, the cylinder 10 can also be fitted inside the PI roll film 200; therefore, it is not considered... Figure 3 As shown, when the cylinder 10 is fitted inside the PI roll film 200, the inner end of the PI roll film 200 is fixed in the fixing groove 20 on the cylinder 10.
[0035] The above-disclosed examples are merely preferred embodiments of the present utility model and should not be construed as limiting the scope of the present utility model. Therefore, any equivalent variations made in accordance with the claims of the present utility model shall fall within the scope of the present utility model.
Claims
1. A graphite sleeve for fixing a PI roll film sintering, comprising a cylinder for sleeving outside or inside the PI roll film, characterized in that, The graphite sleeve also includes a fixing groove formed on the side wall of the cylinder and arranged through the cylinder in the axial direction, the fixing groove being used to fix the end of the PI roll film.
2. The graphite sleeve for fixing a PI roll film sintering according to claim 1, wherein The fixing groove is also arranged through the inner and outer directions of the cylinder, so that the cylinder is an open ring in the circumferential direction.
3. The graphite sleeve for fixing the PI roll film sintering according to claim 1, characterized in that, The cylinder has a first end and a second end spaced apart axially from each other. The first end has a first recessed annular groove arranged circumferentially along the cylinder, which forms a convex ring structure with a reduced outer diameter at the first end. The second end has a second recessed annular groove arranged circumferentially along the cylinder and used to expand the inner diameter of the second end. The dimensions of the second recessed annular groove and the convex ring structure are matched. The first end of the cylinder in one graphite sleeve is sleeved together with the second end of the cylinder in another graphite sleeve by means of the cooperation of the convex ring structure and the second recessed annular groove.
4. The graphite sleeve for fixing a PI roll film sintering according to claim 3, characterized by The first end is provided with a positioning part; the second end is provided with a fitting part that is aligned with the positioning part in the axial direction of the cylinder; the fixing grooves on the two cylinders that are sleeved together are aligned in the axial direction of the cylinder by means of the cooperation of the positioning part and the fitting part.
5. The graphite sleeve for PI roll membrane sintering fixation according to claim 4, characterized by Both the positioning part and the fitting part are arranged to extend circumferentially along the cylinder.
6. The graphite sleeve for sintering and fixing PI roll film according to claim 4, characterized in that, The positioning part is located at the center of the convex ring structure in the circumferential direction.
7. The graphite sleeve for sintering and fixing PI roll film according to claim 4, characterized in that, The positioning part is a notch formed in the convex ring structure, and the fitting part is a partition structure that separates the second sinking ring groove.
8. The graphite sleeve for PI roll membrane sintering fixation according to claim 7, characterized by The notch is square.
9. The graphite sleeve for PI roll membrane sintering fixation according to claim 3, characterized by The end face of the convex ring structure is a flat surface perpendicular to the axial direction of the cylinder, and the cylinder has a mating surface parallel to the end face of the convex ring structure at the position used to define the second sinking ring groove.
10. The graphite sleeve for PI roll membrane sintering fixation according to claim 1, characterized by The cylinder is circular.