A method for wrapping edges of sheets
By cutting the edge-covering material into multiple strips and using stacking bonding technology, the problems of insufficiency and low material utilization in the existing edge-covering technology are solved, and efficient and firm edge-covering for sheets of different specifications are achieved, reducing production costs.
Patent Information
- Application Number
- CN202510010496.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-03
- Publication Date
- 2025-04-01
AI Technical Summary
The existing sandwich edge wrapping technology has problems such as unsolid edge wrapping, many processes, low material utilization, and non-universal die cutting tools, which leads to easy separation of edge wrapping materials and affecting the application effect of the sheet.
By cutting the edging material into multiple edging strips and cutting width according to the sheet specifications, the edging strips are bonded at the four corners of the sheet by laminated bonding to reduce die-cutting process and material loss and improve the utilization rate of edging materials.
It realizes efficient edging for sheets of different specifications, enhances the firmness of edging, avoids separation of edging strips, reduces production costs, and improves the utilization rate of edging materials.
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Figure CN119734454A_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of hemming, and in particular to a hemming method for a sheet material. Background Art
[0002] Graphene sheets are often used in products such as heat conductors, shields, absorbers, and radiators, and thinner graphene sheets are often required. Thinner graphene sheets are prone to cracking and chipping, which may cause quality problems in subsequent products. Therefore, it is necessary to wrap the graphene sheets in advance before use to reduce the problem of cracking and chipping, and avoid quality problems in subsequent products.
[0003] Currently, thin film materials are often used to sandwich the edges of graphene sheets. The general method of sandwich wrapping is similar to sandwich bread, in which the sheet material is sandwiched between two thin film materials of equal size, larger in appearance than the sheet material product and with pores.
[0004] The existing sandwich hemming technology requires a lot of energy and time to perform front and back die-cutting processing of the hemming film material. Not only does it have many processes, but the utilization rate of the film material is relatively low (usually within 10%). In addition, sheet materials with different plane specifications and different thickness specifications need to match die-cutting tools of different specifications. The die-cutting tools are not universal and must be customized. The cost is high and it is not easy to form universal economic benefits. In addition, the existing sandwich hemming technology directly uses two film materials to sandwich the sheet material in the middle for hemming. At the corners of the sheet material, the two film materials are very easy to separate, which may cause the hemming to be unstable. Summary of the invention
[0005] In view of the shortcomings of the prior art, the purpose of the embodiments of the present application is to provide a method for edging a sheet material, so as to improve the current edging method, which is prone to cause the edging to be loose, easily affect the application and use effect of the sheet material, and has many working steps, low utilization rate of edging materials, and non-universal die-cutting tools.
[0006] In a first aspect, an embodiment of the present application provides a method for hemming a sheet material, wherein the sheet material is a quadrilateral and has two opposite first sides and two opposite second sides, and the sheet material has an opposite first surface and a second surface, and a side surface connecting the first surface and the second surface; the hemming method comprises:
[0007] (1) cutting the whole edge binding material to a first width to form a plurality of edge binding strips;
[0008] (2) a binding strip is attached to the first surface of the two opposite first sides, and one side of the binding strip protrudes from the first surface; a binding strip is attached to the second surface of the two opposite first sides, and one side of the binding strip protrudes from the second surface; the binding strip protruding from the first surface and the binding strip protruding from the second surface are bonded together to complete the binding of the two first sides;
[0009] (3) a binding strip is attached to the first surface of the two opposite second sides, and one side of the binding strip protrudes from the first surface; a binding strip is attached to the second surface of the two opposite second sides, and one side of the binding strip protrudes from the second surface; the binding strip protruding from the first surface and the binding strip protruding from the second surface are bonded together to complete the binding of the two second sides;
[0010] The edge strips at the four corners of the first surface and the edge strips at the four corners of the second surface are stacked and bonded.
[0011] The present application forms multiple edging strips by cutting the edging material as a whole to a first width, so that the edging material can be cut as a whole to the required first width according to the needs of sheets of different specifications. The application can efficiently adapt to the edging of sheets of different specifications. After the edging is completed, the edging material can be directly cut off, which can avoid the need to customize die-cutting tools of different specifications, reduce the die-cutting process before and after edging, reduce the loss of edging materials, and improve the utilization rate of edging materials. At the same time, by first edging the first side of the sheet and then edging the second side of the sheet, the edging strips at the four corners of the first surface and the second surface of the sheet are stacked and bonded, so that the edging at the four corners of the sheet is more firm and the separation of the edging strips at the four corners is avoided.
[0012] In some embodiments of the present application, the width of the edging strip attached to the first surface and the second surface is the second width, and the first width is 3-5 mm larger than the second width.
[0013] The present application makes one side of the edging material protrude from the sheet by cutting the first width of the edging material larger than the second width attached to the sheet, which facilitates bonding together the protruding parts of the edging material attached to the first surface and the second surface of the sheet to close the side of the sheet.
[0014] In some embodiments of the present application, along the extension direction of the two first sides, the second width of the two first side edges is 1 / 15-1 / 10 of the distance between the two first sides; along the extension direction of the two second sides, the second width of the two second side edges is 1 / 15-1 / 10 of the distance between the two second sides.
[0015] The present application ensures a firm and efficient edge binding of the sheet while avoiding increasing the size of the sheet too much by fitting an appropriate width of the edge binding on two opposite first and second sides of the sheet.
[0016] In some embodiments of the present application, the width of the edge strip protruding from the first surface and the edge strip protruding from the second surface bonded together is 1-2 mm.
[0017] The present application sets the edging strip protruding from the first surface and the edging strip protruding from the second surface and bonds them together to a suitable width, which can not only ensure the firm edging of the sheet but also avoid increasing the size of the sheet too much, so as to facilitate assembly application in the product.
[0018] In some embodiments of the present application, the length of the first side is greater than the length of the second side.
[0019] The present application performs edging on the longer side of the sheet first and then on the shorter side of the sheet, so that the longer side of the sheet can be fixed again, which helps to make the edging more secure.
[0020] In some embodiments of the present application, in step (2), the sheet material is adsorbed and fixed, and at the same time, an edging strip is respectively adhered to the first surface and the second surface of two opposite first sides, and the edging strip adhered to the first surface protrudes from the first surface, and the edging strip adhered to the second surface protrudes from the second surface; in step (3), the sheet material is adsorbed and fixed, and at the same time, an edging strip is respectively adhered to the first surface and the second surface of two opposite second sides, and the edging strip adhered to the first surface protrudes from the first surface, and the edging strip adhered to the second surface protrudes from the second surface.
[0021] The present application first fixes the sheet by adsorption, and then simultaneously adheres the edging strips to the first surface and the second surface on two opposite sides of the sheet for edging, which is beneficial for positioning the sheet and the edging strip, and can facilitate symmetrical and neat edging of the edging strip and reduce the deviation of the edging strip.
[0022] In some embodiments of the present application, in step (2) and step (3): during lamination and bonding, a tension of 0.5-1 N / m is continuously applied to the edge strip.
[0023] The present application continuously applies appropriate tension to the edging material during lamination and bonding, thereby ensuring that the edging material smoothly edges the sheet material and reduces the occurrence of bubbles, bulges, wrinkles or offsets, while avoiding damage to the edging material due to excessive tension.
[0024] In some embodiments of the present application, step (3) further includes: flattening and / or heating the area of the sheet covered with the edging strip.
[0025] The present application can further make the edging strips tightly, firmly and smoothly bonded to the edging by leveling and / or heating the area of the sheet material coated with the edging strips after edging, thereby reducing the separation and falling of the edging strips.
[0026] In some embodiments of the present application, before step (1), the step also includes: pre-processing the sheet to be edged, the pre-processing including: flattening the side edges and the upper and lower surfaces of the sheet, and removing chips and dust.
[0027] The present application performs a flattening treatment on the sheet material to be edged before edge binding, so that the surface of the sheet material to be edged is flat, and performs a chip and dust removal treatment on the sheet material to be edged, so that the chip and dust removal treated surface is clean, thereby facilitating the flat edge binding of the sheet material and reducing the occurrence of bubbles, bulges, wrinkles, etc.
[0028] In some embodiments of the present application, the edge binding material includes a single-sided adhesive film or a hot-melt adhesive film.
[0029] The present application adopts a single-sided adhesive film or a hot-melt adhesive film as the edging material. The single-sided adhesive film can be directly adhered to the sheet to be edged through the adhesive surface, and two single-sided adhesive films can also be directly adhered together through the adhesive surfaces for edging. The hot-melt adhesive film can be adhered and wrapped on the sheet to be edged by heating, and the two films can be adhered together for edging.
[0030] In some embodiments of the present application, the edge binding material is selected from polyimide film, polyester film, polyethylene film or polypropylene film.
[0031] The present application adopts the above-mentioned film material as the edge wrapping material, so that the sheet material to be edge wrapped can be efficiently edge wrapped. BRIEF DESCRIPTION OF THE DRAWINGS
[0032] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.
[0033] Figure 1 A schematic diagram of hemming two opposite first sides of a sheet provided in an embodiment of the present application.
[0034] Figure 2 A schematic diagram of hemming two opposite second sides of a sheet provided in an embodiment of the present application.
[0035] Figure 3 A cross-sectional view of the sheet after hemming provided in an embodiment of the present application.
[0036] Icon: 1-sheet; 11-first side; 12-second side; 13-first surface; 14-second surface; 2-edge strip. DETAILED DESCRIPTION
[0037] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application will be described clearly and completely below. If the specific conditions are not specified in the embodiments, they are carried out according to the conventional conditions or the conditions recommended by the manufacturer. If the manufacturer is not specified for the reagents or instruments used, they are all conventional products that can be purchased commercially.
[0038] In order to improve the current technical problems. The present application embodiment provides a method for hemming a sheet material, such as Figure 1-Figure 3 As shown, the sheet 1 is a quadrilateral and has two opposite first sides 11 and two opposite second sides 12. The sheet 1 has an opposite first surface 13 and a second surface 14, and a side surface connecting the first surface 13 and the second surface 14. The hemming method includes:
[0039] (1) cutting the whole edge binding material to a first width to form a plurality of edge binding strips 2;
[0040] (2) A edging strip 2 is attached to the first surface 13 of the two opposite first sides 11, and one side of the edging strip 2 protrudes from the first surface 13; a edging strip 2 is attached to the second surface 14 of the two opposite first sides 11, and one side of the edging strip 2 protrudes from the second surface 14; the edging strip 2 protruding from the first surface 13 and the edging strip 2 protruding from the second surface 14 are bonded together to complete the edging of the two first sides 11;
[0041] (3) A edging strip 2 is attached to the first surface 13 of the two opposite second sides 12, and one side of the edging strip 2 protrudes from the first surface 13; a edging strip 2 is attached to the second surface 14 of the two opposite second sides 12, and one side of the edging strip 2 protrudes from the second surface 14; the edging strip 2 protruding from the first surface 13 and the edging strip 2 protruding from the second surface 14 are bonded together to complete the edging of the two second sides 12;
[0042] The edge strips 2 at the four corners of the first surface 13 and the edge strips 2 at the four corners of the second surface 14 are stacked and bonded.
[0043] The present application forms multiple edging strips by cutting the edging material as a whole to a first width, so that the edging material can be cut as a whole to the required first width according to the needs of sheets of different specifications. It can efficiently adapt to the edging of sheets of different specifications (different specifications refer to quadrilaterals with different side lengths or different shapes). After the edging is completed, the edging material can be directly cut off, which can avoid customizing die-cutting tools of different specifications, reduce the die-cutting processes before and after edging, reduce the loss of edging materials, and improve the utilization rate of edging materials. At the same time, the first side of the sheet is first edged, and then the second side of the sheet is edged, so that the edging strips at the four corners of the first surface and the second surface of the sheet are stacked and bonded, so that the edging at the four corners of the sheet is more firm and the separation of the edging strips at the four corners is avoided.
[0044] As an example, the quadrilaterals of different shapes may be, but are not limited to, squares, rectangles, rhombuses, and trapezoids.
[0045] In some embodiments of the present application, the width of the hemming strip attached to the first surface and the second surface is the second width, and the first width is 2-5 mm larger than the second width. As an example, the first width can be, but is not limited to, 2 mm, 2.5 mm, 3 mm, 3.5 mm, 4 mm, 4.5 mm, or 5 mm larger than the second width. Figure 3 As shown in the figure, the width of the edging strip attached to the first surface and the second surface is L1. The first width of the edging material cut is larger than the second width attached to the sheet material, so that one side of the edging material protrudes from the sheet material, which is conducive to bonding the parts of the edging material attached to the first surface and the second surface of the sheet material protruding from the sheet material together to close the side of the sheet material. It should be noted that after the parts of the edging material protruding from the sheet material are bonded together, the width of the edging material bonded together can be trimmed as needed to meet the needs of subsequent applications.
[0046] In some embodiments of the present application, along the extension direction of the two first sides, the second width of the two first side hemming is 1 / 15-1 / 10 of the distance between the two first sides; along the extension direction of the two second sides, the second width of the two second side hemming is 1 / 15-1 / 10 of the distance between the two second sides. The appropriate width of the hemming is fitted on the two opposite first and second sides of the sheet material, which not only ensures a firm and efficient hemming of the sheet material, but also avoids increasing the size of the sheet material too much.
[0047] In some embodiments of the present application, the width of the edge strip protruding from the first surface and the edge strip protruding from the second surface bonded together is 1-2 mm. As an example, the width of the edge strip protruding from the first surface and the edge strip protruding from the second surface bonded together can be, but is not limited to, 1 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm, 1.5 mm, 1.6 mm, 1.7 mm, 1.8 mm, 1.9 mm, 2 mm. Figure 3 As shown, the width of the edge strip protruding from the first surface and the edge strip protruding from the second surface bonded together is shown as L2. Setting the edge strip protruding from the first surface and the edge strip protruding from the second surface bonded together to an appropriate width can ensure a firm edge of the sheet and avoid increasing the size of the sheet too much, so as to facilitate assembly application in the product.
[0048] In some embodiments of the present application, the length of the first side is greater than the length of the second side. The longer side of the sheet is hemmed first, and then the shorter side of the sheet is hemmed. The longer side of the sheet can be fixed again, which is conducive to making the hemming more secure.
[0049] In some embodiments of the present application, in step (2), the sheet is fixed by adsorption, and a edging strip is respectively attached to the first surface and the second surface of the two opposite first sides, and the edging strip attached to the first surface protrudes from the first surface, and the edging strip attached to the second surface protrudes from the second surface; in step (3), the sheet is fixed by adsorption, and a edging strip is respectively attached to the first surface and the second surface of the two opposite second sides, and the edging strip attached to the first surface protrudes from the first surface, and the edging strip attached to the second surface protrudes from the second surface. Firstly, the sheet is fixed by adsorption, and then the edging strips are attached to the first surface and the second surface of the two opposite sides of the sheet for edging, which is conducive to positioning the sheet and the edging strip, and can facilitate symmetrical and neat edging of the edging strip, and reduce the deviation of the edging strip.
[0050] In some embodiments of the present application, in step (2) and step (3): during lamination and bonding, a tension of 0.5-1N / m is continuously applied to the edging strip. As an example, the tension continuously applied to the edging strip may be, but is not limited to, 0.5N / m, 0.6N / m, 0.7N / m, 0.8N / m, 0.9N / m, and 1N / m. By continuously applying appropriate tension to the edging material during lamination and bonding, it is ensured that the edging material is smoothly edged on the sheet material, reducing the occurrence of bubbles, bulges, wrinkles or offsets, and avoiding damage to the edging material due to excessive tension.
[0051] In some embodiments of the present application, after step (3), the step further includes: flattening and / or heating the area of the sheet material coated with the edging strip. Flattening and / or heating the area of the sheet material coated with the edging strip after edging can further make the edging strip tightly, firmly, and smoothly bonded to the edging, thereby reducing the separation and falling of the edging strip.
[0052] In some embodiments of the present application, before step (1), the step further includes: pre-processing the sheet to be hemmed, the pre-processing including: flattening the side edges and the upper and lower surfaces of the sheet, and removing chips and dust. Before hemming, the sheet to be hemmed is flattened to make the surface of the sheet to be hemmed flat, and the sheet to be hemmed is cleaned by removing chips and dust, so as to facilitate flat hemming of the sheet and reduce the occurrence of bubbles, bulges, wrinkles, etc.
[0053] In some embodiments of the present application, the hemming material includes a single-sided adhesive film or a hot-melt adhesive film. The single-sided adhesive film can be directly attached to the sheet to be hemmed through the adhesive surface, and two single-sided adhesive films can also be directly attached together through the adhesive surfaces for hemming. The hot-melt adhesive film can be attached to the sheet to be hemmed by heating, and the two films can be attached together for hemming. As an example, a carrier tape can also be attached to the surface of the hemming material to facilitate the hemming of the auxiliary hemming material and make the hemming smoother. After the hemming is completed, the carrier tape can be directly torn off.
[0054] In some embodiments of the present application, the edge wrapping material is selected from polyimide film (PI), polyester film (PET), polyethylene film (PE) or polypropylene film (PP). Using the above film materials as the edge wrapping material can achieve efficient edge wrapping of the sheet to be wrapped.
[0055] The features and performance of the present application are further described in detail below in conjunction with the embodiments.
[0056] Example 1
[0057] This embodiment provides a method for wrapping an edge of a sheet material, wherein the sheet material is a graphene sheet material of 25.0 mm*25.0 mm*0.3 mm, having two opposite first sides and two opposite second sides, and the sheet material has an opposite first surface and a second surface, and a side surface connecting the first surface and the second surface; the wrapping method comprises:
[0058] (1) The edge binding material is a PI single-sided adhesive film with a thickness of 5 μm, and the edge binding material is cut as a whole to a first width of 3.5 mm to form a plurality of edge binding strips;
[0059] (2) Adsorbing and fixing the sheet material, using a tension control device to continuously apply a tension of 0.5 to 0.8 N / m to the multiple edge strips, and at the same time, laminating an edge strip on the first surface and the second surface of the two opposite first sides, respectively. The edge strips are laminating on the first surface and the second surface to have a second width of 1.0 mm, and the edge strip laminating on the first surface protrudes 2.0 mm from the first surface, and the edge strip laminating on the second surface protrudes 2.0 mm from the second surface. The edge strips protruding from the first surface and the edge strips protruding from the second surface are bonded together, and the width of the bonded together is 2.0 mm, thereby completing the edge binding of the two first sides;
[0060] (3) Adsorbing and fixing the sheet material, using a tension control device to continuously apply a tension of 0.5 to 0.8 N / m to the multiple edge strips, and at the same time, laminating an edge strip on the first surface and the second surface of the two opposite second sides, respectively. The edge strips are laminating on the first surface and the second surface to have a second width of 1.0 mm, and the edge strip laminating on the first surface protrudes 2.0 mm from the first surface, and the edge strip laminating on the second surface protrudes 2.0 mm from the second surface. The edge strips protruding from the first surface and the edge strips protruding from the second surface are bonded together, and the width of the bonded together is 2.0 mm, thereby completing the edge binding of the two second sides;
[0061] The edge strips at the four corners of the first surface and the edge strips at the four corners of the second surface are stacked and bonded.
[0062] Example 2
[0063] This embodiment provides a method for wrapping a sheet, wherein the sheet is a graphene sheet of 25.0 mm*25.0 mm*0.5 mm, having two opposite first sides and two opposite second sides, and the sheet has an opposite first surface and a second surface, and a side surface connecting the first surface and the second surface; the wrapping method comprises:
[0064] (1) The edge binding material is a PI single-sided adhesive film with a thickness of 5 μm, and the edge binding material is cut as a whole to a first width of 3.5 mm to form a plurality of edge binding strips;
[0065] (2) Adsorbing and fixing the sheet material, using a tension control device to continuously apply a tension of 0.5 to 0.8 N / m to the multiple edge strips, and at the same time, laminating an edge strip on the first surface and the second surface of the two opposite first sides, respectively. The edge strips are laminating on the first surface and the second surface to have a second width of 1.0 mm, and the edge strip laminating on the first surface protrudes 2.0 mm from the first surface, and the edge strip laminating on the second surface protrudes 2.0 mm from the second surface. The edge strips protruding from the first surface and the edge strips protruding from the second surface are bonded together, and the width of the bonded together is 2.0 mm, thereby completing the edge binding of the two first sides;
[0066] (3) Adsorbing and fixing the sheet material, using a tension control device to continuously apply a tension of 0.5 to 0.8 N / m to the multiple edge strips, and at the same time, laminating an edge strip on the first surface and the second surface of the two opposite second sides, respectively. The edge strips are laminating on the first surface and the second surface to have a second width of 1.0 mm, and the edge strip laminating on the first surface protrudes 2.0 mm from the first surface, and the edge strip laminating on the second surface protrudes 2.0 mm from the second surface. The edge strips protruding from the first surface and the edge strips protruding from the second surface are bonded together, and the width of the bonded together is 2.0 mm, thereby completing the edge binding of the two second sides;
[0067] The edge strips at the four corners of the first surface and the edge strips at the four corners of the second surface are stacked and bonded.
[0068] Example 3
[0069] This embodiment provides a method for wrapping a sheet, wherein the sheet is a graphene sheet of 20.0 mm*30.0 mm*0.8 mm, having two opposite first sides and two opposite second sides, and the sheet has an opposite first surface and a second surface, and a side surface connecting the first surface and the second surface; the wrapping method comprises:
[0070] (1) The edge binding material is a PI single-sided adhesive film with a thickness of 5 μm, and the edge binding material is cut as a whole to a first width of 3.5 mm to form a plurality of edge binding strips;
[0071] (2) Adsorbing and fixing the sheet material, using a tension control device to continuously apply a tension of 0.5 to 0.8 N / m to the multiple edge strips, and at the same time, laminating an edge strip on the first surface and the second surface of the two opposite first sides with a length of 30.0 mm, respectively. The edge strips laminating the first surface and the second surface have a second width of 1.0 mm, and the edge strip laminating the first surface protrudes 2.0 mm from the first surface, and the edge strip laminating the second surface protrudes 2.0 mm from the second surface. The edge strips protruding from the first surface and the edge strips protruding from the second surface are bonded together, and the width of the bonded together is trimmed to 2.0 mm, thereby completing the edge binding of the two first sides;
[0072] (3) Adsorb and fix the sheet material, and use a tension control device to continuously apply a tension of 0.5 to 0.8 N / m to the multiple edge strips. At the same time, a edge strip is respectively attached to the first surface and the second surface of the two opposite second sides with a length of 20.0 mm. The edge strips attached to the first surface and the second surface have a second width of 1.0 mm, and the edge strip attached to the first surface protrudes 2.0 mm from the first surface, and the edge strip attached to the second surface protrudes 2.0 mm from the second surface. The edge strip protruding from the first surface and the edge strip protruding from the second surface are bonded together, and the width of the bonded together is trimmed to 2.0 mm, thereby completing the edge binding of the two second sides;
[0073] The edge strips at the four corners of the first surface and the edge strips at the four corners of the second surface are stacked and bonded.
[0074] The hemming methods of the sheets provided in Examples 1-3 are shown in Table 1.
[0075] Table 1 Edge wrapping method of sheet
[0076]
[0077]
[0078] Test Example 1
[0079] This test example conducts reliability tests on the sheets that have been hemmed in Examples 1-3. The specific method is:
[0080] 1. Double 85 test: The hemmed sheets provided in Examples 1-3 were placed in a constant temperature and humidity chamber at a temperature of 85°C and a humidity of 85% for 1000 hours to detect the hemming condition.
[0081] 2. Thermal shock test: The edge-wrapped sheets provided in Examples 1-3 were placed in a thermal shock tester at a temperature of 40-125°C and the temperature was switched every 0.5h for 1000h to test the edge-wrapping condition. The results are shown in Table 2.
[0082] Table 2 Hemming reliability of the sheets of Examples 1-3
[0083]
[0084] From the results in Table 2, it can be seen that the hemming method provided in Examples 1-3 hems the two opposite first and second sides of the graphene sheet. After the double 85 test and the hot and cold shock test, the hemming film has no cracks and no falling off. This shows that the hemming method of the sheet provided in the present application can efficiently and firmly hem the two opposite first and second sides of the graphene sheet, thereby achieving a firmer hemming at the four corners of the sheet, avoiding the separation of the hemming strips at the four corners, and avoiding affecting the application and use effect of the sheet; and there are fewer processes, a high utilization rate of hemming materials, and universal die-cutting tools.
[0085] The embodiments described above are part of the embodiments of the present application, rather than all of the embodiments. The detailed description of the embodiments of the present application is not intended to limit the scope of the present application for protection, but merely represents the selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present application.
Claims
1. A method for hemming a sheet material, wherein the sheet material is quadrilateral and has two opposite first sides and two opposite second sides, the sheet material has an opposite first surface and a second surface, and a side surface connecting the first surface and the second surface; characterized in that: The hemming method comprises: (1) cutting the whole edge binding material to a first width to form a plurality of edge binding strips; (2) a binding strip is attached to the first surface of two opposite first sides, with one side of the binding strip protruding from the first surface; a binding strip is attached to the second surface of two opposite first sides, with one side of the binding strip protruding from the second surface; the binding strip protruding from the first surface and the binding strip protruding from the second surface are bonded together to complete the binding of the two first sides; (3) a binding strip is attached to the first surface of two opposite second sides, with one side of the binding strip protruding from the first surface; a binding strip is attached to the second surface of two opposite second sides, with one side of the binding strip protruding from the second surface; the binding strip protruding from the first surface and the binding strip protruding from the second surface are bonded together to complete the binding of the two second sides; Wherein, the edge strips at the four corners of the first surface and the edge strips at the four corners of the second surface are stacked and bonded.
2. The hemming method according to claim 1, characterized in that: The width of the edging strip attached to the first surface and the second surface is the second width, and the first width is 3-5 mm larger than the second width.
3. The hemming method according to claim 2, characterized in that: Along the extension direction of the two first sides, the second width of the edges of the two first sides is 1 / 15-1 / 10 of the distance between the two first sides; Along the extension direction of the two second sides, the second width of the edges of the two second sides is 1 / 15-1 / 10 of the distance between the two second sides.
4. The hemming method according to claim 2, characterized in that: The width of the edge strip protruding from the first surface and the edge strip protruding from the second surface bonded together is 1-2 mm.
5. The hemming method according to any one of claims 1 to 4, characterized in that: The length of the first side is greater than the length of the second side.
6. The hemming method according to any one of claims 1 to 4, characterized in that: In step (2), the sheet material is fixed by adsorption, and at the same time, one of the edging strips is respectively attached to the first surface and the second surface of the two opposite first sides, and the edging strip attached to the first surface protrudes from the first surface, and the edging strip attached to the second surface protrudes from the second surface; In step (3), the sheet material is fixed by adsorption, and at the same time, a edging strip is respectively attached to the first surface and the second surface of the two opposite second sides, and the edging strip attached to the first surface protrudes from the first surface, and the edging strip attached to the second surface protrudes from the second surface.
7. The hemming method according to any one of claims 1 to 4, characterized in that: In step (2) and step (3): during the lamination and bonding, a tension of 0.5-1N / m is continuously applied to the edging strip.
8. The hemming method according to any one of claims 1 to 4, characterized in that: After step (3), the method further includes: flattening and / or heating the area of the sheet covered with the edging strip.
9. The hemming method according to any one of claims 1 to 4, characterized in that: Before step (1), the method further includes: pre-processing the sheet material to be edged, wherein the pre-processing includes: flattening the side edges and the upper and lower surfaces of the sheet material, and removing chips and dust.
10. The hemming method according to any one of claims 1 to 4, characterized in that: The edge binding material includes a single-sided adhesive film or a hot-melt adhesive film; Optionally, the edge binding material is selected from polyimide film, polyester film, polyethylene film or polypropylene film.