An extrusion coated gasket

Abstract

This utility model relates to the field of coating machine gasket technology, specifically to an extrusion coating gasket, which includes a gasket base, side strips, and adhesive pads. A mounting groove is formed in the middle of the front end of the gasket. Mounting blocks are fixedly connected to both sides of the mounting groove. Side strips are slidably mounted on the mounting blocks, with the front end face of the side strips flush with the front end face of the gasket base. Two adhesive pads are provided, each corresponding to one of the two side strips. The adhesive pads are located between the side strips and the gasket, and behind the side strips. During use, this utility model allows adjustment of the distance between the two side strips in the left-right direction according to actual production needs, thereby changing the coating width. This solves the problem in the prior art where the coating machine needs to be disassembled and the gasket replaced when the coating width changes. By detachably installing spacers in the mounting groove, two electrode sheets can be coated simultaneously on the foil, and the coating width of the two electrode sheets can be equal or unequal.

Description

Technical Field

[0001] This utility model relates to the field of testing equipment technology, specifically to an extrusion coated gasket. Background Technology

[0002] Slit coating is a key technology that uses a precision die to uniformly coat a slurry onto a substrate surface. Its core lies in controlling the slurry flow and distribution through a narrow channel formed by the upper and lower dies. This technology is widely used in the preparation of high-performance coatings for lithium-ion battery electrodes and optical thin films. By adjusting the die pressure, coating speed, and slurry rheological properties, nanometer-level precision coating thickness control can be achieved. The success of slit coating largely depends on the stability of the die system, with the gasket being a core component for adjusting the coating width, directly affecting the uniformity and defect rate of the edge coating. Traditional coating machines use a fixed-width gasket design, requiring frequent replacement of the entire gasket set when producing coated products of different specifications. This results in long equipment downtime, low production efficiency, high changeover costs, and the need to maintain inventory of various gasket specifications. Utility Model Content

[0003] To address the shortcomings of existing technologies, this invention proposes an extrusion coating gasket. This device solves the problem that existing coating machines need to be disassembled and the gasket replaced when the coating width changes.

[0004] The present invention provides an extrusion coated gasket, which includes a gasket substrate, side strips, and a rubber pad.

[0005] The gasket base is fixedly connected between the upper and lower die heads. The front end face of the gasket base, the front end face of the upper die head, and the lower end face of the lower die head are flush. The gasket base, the upper die head, and the lower die head are of equal length and equal width. A mounting groove is provided in the middle of the front end of the gasket.

[0006] There are two mounting blocks, which are fixedly connected to the left and right end faces of the mounting slot respectively, and the mounting blocks extend in the left and right direction.

[0007] There are two side guards, which are slidably mounted on two mounting blocks, one to the left and one to the right. The front end of the side guard is flush with the front end of the gasket base.

[0008] There are two rubber pads, one for each of the two side rails. The rubber pads are located between the side rails and the gaskets, and behind the side rails.

[0009] Optionally, the gasket is made of polytetrafluoroethylene or ethylene propylene diene monomer (EPDM) rubber, and the thickness of the gasket is not less than the thickness of the gasket substrate.

[0010] Optionally, a first chamfer is provided between the front end face and the side end face of the side guard strip. A second chamfer is provided between the rear end face and the side end face of the side guard strip. The length of the first chamfer in the left-right direction ranges from 0.5 to 2.5 mm, and the length of the first chamfer in the front-back direction ranges from 1.0 to 4 mm. The length of the second chamfer in both the front-back and left-back directions ranges from 3 to 10 mm.

[0011] Optionally, the side guard strip and the mounting block form a clearance fit, with the clearance ranging from 0.01 to 0.05 mm.

[0012] Optionally, a spacer is installed in the middle of the mounting groove. The spacer extends in the front-rear direction, and the front end face of the spacer is flush with the front end face of the gasket substrate.

[0013] Optionally, the spacer strip is detachably connected to the mounting groove.

[0014] Optionally, a third chamfer is provided between the front end face and the left end face of the spacer and between the front end face and the right end face of the spacer.

[0015] Optionally, the length of the third chamfer in the left-right direction ranges from 1.0 to 4 mm. The length of the chamfer in the front-back direction ranges from 0.5 to 2.5 mm.

[0016] The beneficial effects of this utility model are: it can adapt to the production needs of different coating widths. When the required coating width changes, the side baffles move in the left and right directions, thereby changing the width of the die lip gap. When the two side baffles are close to each other, the coating width decreases, and when the two side baffles are far apart, the coating width increases. This solves the problem that the coating machine shims in the prior art cannot adapt to different coating widths. When the coating width changes, there is no need to replace the shims; only the distance between the two side baffles needs to be adjusted, thus improving production efficiency.

[0017] Furthermore, by setting a rubber pad made of polytetrafluoroethylene or ethylene propylene diene monomer (EPDM) with a thickness not less than that of the gasket substrate, the service life of the gasket is extended, and the rubber pad is ensured to play a good buffering and sealing role during the coating process, preventing the coating material from overflowing from the gap between the mounting block and the side strip, thus preventing contamination of the coating foil.

[0018] Furthermore, the mounting groove is detachably connected with spacers, allowing the gasket to be used in a one-to-two coating process to coat two electrodes on the foil. During the coating process, the two side baffles can be moved left and right to achieve coating with equal or unequal widths for the two electrodes. Spacers of corresponding widths can also be replaced according to actual work requirements, thus adapting to production needs with different distances between the two electrodes.

[0019] Furthermore, the slurry is guided by the first, second, and third chamfers to ensure the coating effect. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the overall structure of an extrusion coating pad installed on the upper and lower dies of this utility model;

[0022] Figure 2 for Figure 1 Side sectional view of the middle structure;

[0023] Figure 3 This is a schematic diagram of the structure of an extrusion coated gasket according to the present invention;

[0024] Figure 4 This is a schematic diagram of the side baffle in an extrusion coated gasket according to the present invention;

[0025] Figure 5 This is a schematic diagram of an embodiment of the present invention: an extruded coated gasket with spacers.

[0026] Figure 6 This is a schematic diagram of an embodiment of the present invention of an extruded coated gasket with wider spacers;

[0027] Figure 7 for Figure 6 A schematic diagram of the structure of the spacer bar.

[0028] In the diagram: 100, gasket base; 110, mounting block; 200, side retainer; 210, first chamfer; 220, second chamfer; 300, rubber pad; 400, upper die head; 500, lower die head; 600, spacer; 610, third chamfer. Detailed Implementation

[0029] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0030] like Figures 1 to 7 As shown, the extrusion coated gasket provided by this utility model includes a gasket substrate 100, a side strip 200, and an adhesive pad 300.

[0031] The gasket base 100 is fixedly connected between the upper die head 400 and the lower die head 500. The front end face of the gasket base 100, the front end face of the upper die head 400, and the lower end face of the lower die head 500 are flush. The gasket base 100, the upper die head 400, and the lower die head 500 are of equal length and width. A mounting groove is provided in the middle of the front end of the gasket.

[0032] There are two mounting blocks 110, which are fixedly connected to the left and right end faces of the mounting groove respectively, and the mounting blocks 110 extend in the left and right direction.

[0033] Two side baffles 200 are provided, which are slidably mounted on two mounting blocks 110 to the left and right respectively. The front end face of the side baffle 200 is flush with the front end face of the gasket base 100. The side baffle 200 and the mounting block 110 form a clearance fit, with a clearance range of 0.01-0.05mm. Thus, when the upper and lower mold heads 500 are not closed and pressed tightly, the side baffle 200 can move smoothly relative to the mounting block 110 when a lateral force is applied to it.

[0034] There are two rubber pads 300, one for each of the two side retaining strips 200. The rubber pads 300 are located between the side retaining strips 200 and the gaskets, and are located behind the side retaining strips 200.

[0035] When the required coating width changes, the side baffles 200 are moved in the left and right directions, thereby changing the width of the die lip gap. When the two side baffles 200 are close to each other, the coating width decreases, and when the two side baffles 200 are far apart, the coating width increases. This solves the problem that the coating machine shims in the prior art cannot adapt to different coating widths. When the coating width changes, there is no need to replace the shims; only the distance between the two side baffles 200 needs to be adjusted, thus improving production efficiency.

[0036] In a further embodiment, the rubber pad 300 is made of polytetrafluoroethylene or ethylene propylene diene monomer (EPDM) rubber. These two materials possess excellent chemical resistance, abrasion resistance, and a low coefficient of friction, ensuring stable performance of the rubber pad 300 during long-term use, reducing adhesion to the coating material, and extending the gasket's service life. The thickness of the rubber pad 300 is not less than the thickness of the gasket substrate 100. This ensures that the rubber pad 300 provides good cushioning and sealing during the coating process, preventing coating material from overflowing from the gap between the mounting block 110 and the side baffle 200, thus preventing contamination of the coating foil.

[0037] Furthermore, the adhesive pad 300 is slidably installed between the gasket substrate 100 and the side baffle 200. When the coating width is constant, moving the adhesive pad 300 in the left and right directions changes the volume of the cavity between the adhesive pad 300, the side baffle 200, the gasket substrate 100, and the upper and lower die heads 500, thereby changing the filling pressure of the slurry at the edge position, which in turn affects the width of the thinning zone at the coating edge and the thinning gradient, thus optimizing the coating effect.

[0038] In a further embodiment, a first chamfer 210 is provided between the front end face and the side end face of the side baffle 200. A second chamfer 220 is provided between the rear end face and the side end face of the side baffle 200. The length of the first chamfer 210 in the left-right direction ranges from 0.5 to 2.5 mm, and the length of the first chamfer 210 in the front-back direction ranges from 1.0 to 4 mm. The length of the second chamfer 220 in both the front-back and left-back directions ranges from 3 to 10 mm. The first chamfer 210 is used to prevent bulging at the coating edge, and the second chamfer 220 is used to guide the slurry, making the slurry flow more smoothly when entering the slit, thereby making the coating thickness more uniform and controlling the thinning zone within 10 mm.

[0039] In a further embodiment, a spacer 600 is installed in the middle of the mounting groove. The spacer 600 extends in the front-to-back direction, and its front end face is flush with the front end face of the gasket substrate 100. This can be applied to a one-to-two coating process to coat two electrodes on the foil. During the coating process, the two side baffles 200 can be moved left and right to achieve coating with equal or unequal widths for the two electrodes. The spacer 600 is detachably connected to the mounting groove, and a spacer 600 of corresponding width can be replaced according to actual working needs, thereby adapting to production requirements with different distances between the two electrodes.

[0040] In a further embodiment, a third chamfer 610 is provided between the front end face and the left end face of the spacer 600, and between the front end face and the right end face of the spacer 600. The length of the third chamfer 610 in the left-right direction ranges from 1.0 to 4 mm. The length of the chamfer in the front-back direction ranges from 0.5 to 2.5 mm. The third chamfer 610 is used to guide the slurry during the coating process, thereby making the width of the thinned zone less than 10 mm.

[0041] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. An extrusion coating gasket fixedly connected between an upper die and a lower die, characterized by, include: Gasket base, side strips, and rubber gaskets; A mounting groove is provided in the middle of the front end of the gasket; There are two mounting blocks, which are fixedly connected to the left and right end faces of the mounting slot respectively, and the mounting blocks extend in the left and right direction; There are two side guards, which are slidably installed on the two mounting blocks to the left and right respectively; the front end face of the side guard is flush with the front end face of the gasket base; There are two rubber pads, one for each of the two side rails; the rubber pads are located between the side rails and the gaskets, and behind the side rails.

2. The extrusion coated gasket of claim 1 wherein, The gasket is made of polytetrafluoroethylene or ethylene propylene diene monomer (EPDM) rubber, and the thickness of the gasket is not less than the thickness of the gasket substrate.

3. The extrusion coated gasket of claim 1 wherein, A first chamfer is provided between the front end face and the side end face of the side guard strip; a second chamfer is provided between the rear end face and the side end face of the side guard strip; the length of the first chamfer in the left-right direction is 0.5-2.5mm, and the length of the first chamfer in the front-back direction is 1.0-4mm; the length of the second chamfer in both the front-back and left-back directions is 3-10mm.

4. The extrusion coated gasket of claim 1 wherein, The side guard strip and the mounting block form a clearance fit, with the clearance ranging from 0.01 to 0.05 mm.

5. The extrusion coated gasket of claim 1 wherein, A spacer is installed in the middle of the mounting groove; the spacer extends in the front-to-back direction, and the front end face of the spacer is flush with the front end face of the gasket base.

6. An extrusion coated gasket according to claim 5 wherein, The spacer bar is detachably connected to the mounting groove.

7. The extrusion coated gasket of claim 5 wherein, A third chamfer is provided between the front end face and the left end face of the spacer and between the front end face and the right end face of the spacer.

8. The extrusion coated gasket of claim 7 wherein, The length of the third chamfer in the left-right direction ranges from 1.0 to 4 mm; the length of the chamfer in the front-back direction ranges from 0.5 to 2.5 mm.

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