Edge covering method for periphery of sheet

Abstract

The invention relates to an edge covering method for the periphery of a sheet, and belongs to the technical field of edge covering. The method comprises the following steps: (1) integrally cutting an edge covering material until the width of the edge covering material is the same as the thickness of a sheet to be subjected to edge covering; (2) positioning the cut edge covering material and the to-be-edge-covered sheet at the same height, and adhering one end of the cut edge covering material to the side edge of the to-be-edge-covered sheet in a lapping manner, so that the width of the edge covering material is matched with the thickness of the side edge of the to-be-edge-covered sheet; and (3) rotating the to-be-edged sheet of which the side edge is adhered with one end of the edging material, enabling the edging material to wrap the side edge of the to-be-edged sheet for a circle, overlapping and smoothly fitting the interface positions of the edging material, and cutting off the edging material to finish edging. After the edge of the sheet is covered, the problem that the sheet is broken and scraps fall off is avoided, the situation that the external size of the sheet is increased too much to affect assembly and application of the sheet in a product is avoided, die cutting procedures before and after edge covering are reduced, and loss of edge covering materials is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of hemming, and in particular to a hemming method for the periphery of 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] At present, film materials are often used to wrap graphene sheets. Commonly used wrapping technologies include sandwich wrapping and U-shaped wrapping. The general practice of sandwich wrapping is similar to sandwich bread, where the sheet material is sandwiched between two equal-sized film materials that are larger than the sheet material product and have a central hole for wrapping. The general practice of U-shaped wrapping is similar to the U-shaped edge protection of tooling board mounting, where the periphery of the sheet material is sandwiched in a closed U-shaped wrapping material for wrapping.

[0004] At present, after the sheet materials are hemmed by these hemming methods, the external dimensions of the sheet materials will be increased, which will affect the subsequent assembly and application of the sheet materials in products such as heat conductors, shields, absorbers, and radiators, and will especially affect the use of products that require high-precision surface contact. In addition, the existing hemming technology requires a lot of energy and time to perform the front and back die-cutting of the hemming film materials. Not only are there many processes, but the utilization rate of the film materials is relatively low (usually within 10%), and sheet materials of 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, which is costly and difficult to form universal economic benefits. 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 the perimeter of a sheet material, so as to improve the problems that the current edging technology will increase the external dimensions of the sheet material, easily affect the application and use of the sheet material, and has many 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 periphery of a sheet material, comprising:

[0007] (1) Cut the whole hemming material to a width that is the same as the thickness of the sheet to be hemmed;

[0008] (2) Positioning the cut edge material and the sheet to be edged at the same height, and gluing one end of the cut edge material to the side of the sheet to be edged, so that the width of the edge material matches the thickness of the side of the sheet to be edged;

[0009] (3) Rotate the sheet to be hemmed with one end of the hemming material attached to the side so that the hemming material covers the side of the sheet to be hemmed for a circle, overlap and smoothly fit the interface of the hemming material, cut off the hemming material, and complete the hemming.

[0010] The present application first cuts the edging material to a width the same as the thickness of the material to be edged, and then edging the side of the sheet, which 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, and reduce the loss of edging materials, thereby improving the utilization rate of edging materials; at the same time, the edging material is only used to edge the side of the sheet for one week, which can avoid making the external dimensions of the sheet increase too much, thereby achieving the goal of avoiding the problem of sheet breaking and chipping after edging, and avoiding the external dimensions of the sheet increasing too much to affect the assembly application in the product, especially avoiding the use effect of products requiring high-precision surface contact.

[0011] In some embodiments of the present application, step (3) also includes: using a tension control device to continuously apply tension to the hemming material.

[0012] The present application continuously applies a certain tension to the hemming material through a tension control device, so that the hemming material always has a certain tension during the hemming process, which is beneficial for the hemming material to smoothly hem the sheet to be hemmed and reduce problems such as blistering and wrinkles.

[0013] In some embodiments of the present application, a tension of 0.5-1 N / m is continuously applied to the edge binding material.

[0014] The present application ensures that the edging material smoothly edges the sheet material to be edged by continuously applying appropriate tension to the edging material, while preventing the edging material from being damaged by excessive tension.

[0015] In some embodiments of the present application, the rotation speed of the sheet in step (3) is 0.1-2 m / s.

[0016] The present application controls the sheet to be edged to rotate at an appropriate speed during the edge-binding process, and combines the edge-binding materials with appropriate tension to achieve flat and stable edge binding, thereby further ensuring smooth edge binding of the sheet to be edged and reducing problems such as blistering and wrinkles.

[0017] In some embodiments of the present application, step (3) further includes: flattening and / or heating the side of the sheet coated with the edging material.

[0018] The present application can further make the edging material fit tightly and evenly to the side of the sheet material after edging by flattening and / or heating the side of the sheet material coated with the edging material, thereby reducing the edging from falling off.

[0019] In some embodiments of the present application, before step (1), the step also includes: pre-processing the sheet material to be edged; the sheet material includes graphene material.

[0020] The present application performs certain pre-treatment on the sheet before hemming to make the sheet smooth, which is conducive to subsequent smooth and efficient hemming.

[0021] In some embodiments of the present application, the pre-treatment of the sheet material to be edged includes: flattening the side edges and the upper and lower planes of the sheet material to be edged, and performing chip and dust removal treatments.

[0022] 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 to be edged and reducing the occurrence of bubbles, bulges, wrinkles, etc.

[0023] In some embodiments of the present application, the edge binding material includes a single-sided adhesive film or a hot-melt adhesive film.

[0024] The present application adopts a single-sided adhesive film or a hot-melt adhesive film as the edge wrapping material. The single-sided adhesive film can be directly adhered to the side edge of the sheet to be edged through the adhesive surface for edge wrapping. The hot-melt adhesive film can be adhered and wrapped to the side edge of the sheet to be edged by heating.

[0025] In some embodiments of the present application, the edge binding material is selected from polyimide film, polyester film, polyethylene film or polypropylene film.

[0026] 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.

[0027] In some embodiments of the present application, the interface positions of the edging materials in step (3) overlap by 0.1-0.5 mm.

[0028] The present application can completely cover the side of the sheet to be edged and avoid the size of the sheet to be enlarged after edged by overlapping and bonding the edged materials at the interface of the edged materials to a suitable length. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] 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.

[0030] Figure 1 A schematic diagram of a method for hemming the perimeter of a sheet provided in an embodiment of the present application.

[0031] Icon: 1-edge material; 2-sheet to be edged. DETAILED DESCRIPTION

[0032] 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.

[0033] In order to improve the problems that the current hemming technology will increase the external dimensions of the sheet, easily affect the application and use effect of the sheet, and has many processes, low utilization rate of hemming materials, and non-universal die-cutting tools. The present application embodiment provides a hemming method for the periphery of a sheet, such as Figure 1 As shown, including:

[0034] (1) Cutting the whole hemming material 1 to a width equal to the thickness of the hemming sheet 2;

[0035] (2) Positioning the cut edge material 1 and the sheet material 2 to be edged at the same height, and overlapping and adhering one end of the cut edge material 1 to the side of the sheet material 2 to be edged, so that the width of the edge material 1 is adapted to the thickness of the side of the sheet material 2 to be edged;

[0036] (3) Rotate the sheet material 2 to be hemmed with one end of the hemming material 1 on the side so that the hemming material 1 covers the side of the sheet material 2 to be hemmed. The interface of the hemming material 1 overlaps and fits smoothly. Cut off the hemming material 1 to complete the hemming.

[0037] The present application first cuts the edging material to a width the same as the thickness of the sheet to be edged, and then edging the side of the sheet, which 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 processes before and after edging, and reduce the loss of edging materials, thereby improving the utilization rate of edging materials. At the same time, the edging material is only used to edge the side of the sheet for one week, which can avoid making the external dimensions of the sheet increase too much, thereby achieving the goal of avoiding the problem of sheet breaking and chipping after edging, and avoiding the external dimensions of the sheet increasing too much to affect the assembly application in the product, especially avoiding the use effect of products requiring high-precision surface contact.

[0038] As an example, a precision slitting machine can be used to cut the hemming material so that the width of the hemming material is the same as the thickness of the sheet to be hemmed. An adsorption device or a clamping device can be used to position the cut hemming material and the sheet to be hemmed at the same height. An electric rotating device can be used to drive the sheet to be hemmed to rotate.

[0039] In some embodiments of the present application, step (3) further includes: using a tension control device to continuously apply tension to the hemming material. The tension control device continuously applies a certain tension to the hemming material, so that the hemming material always has a certain tension during the hemming process, which is conducive to the hemming material to smoothly hem the sheet material to be hemmed, and reduce problems such as blistering and wrinkles.

[0040] In some embodiments of the present application, the tension continuously applied to the hemming material is 0.5-1N / m. As an example, the tension continuously applied to the hemming material 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. Continuously applying appropriate tension to the hemming material ensures that the hemming material smoothly hems the sheet material to be hemmed, while avoiding damage to the hemming material caused by excessive tension.

[0041] In some embodiments of the present application, the rotation speed of the sheet in step (3) is 0.1-2 m / s. As an example, the rotation speed of the sheet in step (3) can be, but is not limited to, 0.1 m / s, 0.2 m / s, 0.5 m / s, 0.6 m / s, 0.8 m / s, 1 m / s, 1.2 m / s, 1.5 m / s, 1.6 m / s, 1.8 m / s, 2 m / s. In the hemming process, the sheet to be hemmed is controlled to rotate at an appropriate speed for hemming, and the hemming material with appropriate tension is used to achieve smooth and stable hemming, further ensuring smooth hemming of the sheet to be hemmed, and reducing problems such as blistering and wrinkles.

[0042] In some embodiments of the present application, after step (3), the step further includes: flattening and / or heating the side of the sheet coated with the edging material. Flattening and / or heating the side of the sheet coated with the edging material after edging can further make the edging material fit tightly and evenly to the side of the sheet, thereby reducing the edging from falling off.

[0043] In some embodiments of the present application, before step (1), the step further includes: pre-processing the sheet to be hemmed. Before hemming, the sheet is pre-processed to make the sheet to be hemmed smooth, which is conducive to subsequent smooth and efficient hemming.

[0044] In some embodiments of the present application, the pre-treatment of the sheet to be hemmed includes: flattening the side edges and the upper and lower planes of the sheet to be hemmed, and removing chips and dust. The sheet to be hemmed is flattened before hemming to make the surface of the sheet to be hemmed flat, and the sheet to be hemmed is subjected to chip and dust removal to make the chip and dust removal surface clean, so as to facilitate the flat hemming of the sheet to be hemmed and reduce the occurrence of bubbles, bulges, wrinkles, etc.

[0045] In some embodiments of the present application, the hemming material includes a single-sided adhesive film or a hot-melt adhesive film. When a single-sided adhesive film or a hot-melt adhesive film is used as the hemming material, the single-sided adhesive film can be directly attached to the side of the sheet to be hemmed through the adhesive surface for hemming, and the hot-melt adhesive film can be attached to the side of the sheet to be hemmed by heating.

[0046] 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.

[0047] In some embodiments of the present application, the interface of the hemming material in step (3) overlaps by 0.1-0.5 mm. As an example, the interface of the hemming material in step (3) may overlap by, but is not limited to, 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm, or 0.5 mm. Overlapping the interface of the hemming material to a suitable length can not only completely cover the side of the sheet to be hemmed, but also prevent the size of the sheet from becoming larger after hemming.

[0048] The features and performance of the present application are further described in detail below in conjunction with the embodiments.

[0049] Example 1

[0050] This embodiment provides a method for hemming a sheet, comprising:

[0051] (1) The edge wrapping material is a PI single-sided adhesive film with a thickness of 5 μm, and the sheet to be edge wrapped is a graphene sheet with a size of 25.0 mm*25.0 mm*2.0 mm; the PI single-sided adhesive film is cut as a whole to a width of 2.0 mm, which is the same as the thickness of the graphene sheet to be edge wrapped;

[0052] (2) positioning the cut PI single-sided adhesive film and the graphene sheet to be wrapped at the same height using an adsorption device, and overlapping one end of the cut PI single-sided adhesive film on the side of the graphene sheet to be wrapped, so that the width of the PI single-sided adhesive film is adapted to the thickness of the side of the graphene sheet to be wrapped;

[0053] (3) A tension control device is used to continuously apply a tension of 0.8 N / m to the PI single-sided adhesive film, and an electric rotating device is used to drive the graphene sheet to be wrapped, with one end of the side covered with the PI single-sided adhesive film, to rotate at a speed of 0.2 m / s, so that the PI single-sided adhesive film covers the side of the graphene sheet to be wrapped. The interface of the PI single-sided adhesive film overlaps and fits smoothly by 0.2 mm, and the PI single-sided adhesive film is cut off to complete the wrapping.

[0054] Example 2

[0055] This comparative example provides a method for hemming the periphery of a sheet material, comprising:

[0056] (1) The edge wrapping material is a PI single-sided adhesive film with a thickness of 5 μm, and the sheet to be edge wrapped is a graphene sheet with a size of 25.0 mm*25.0 mm*1.5 mm; the PI single-sided adhesive film is cut as a whole to a width of 1.5 mm, which is the same as the thickness of the graphene sheet to be edge wrapped;

[0057] (2) positioning the cut PI single-sided adhesive film and the graphene sheet to be wrapped at the same height using an adsorption device, and overlapping one end of the cut PI single-sided adhesive film on the side of the graphene sheet to be wrapped, so that the width of the PI single-sided adhesive film is adapted to the thickness of the side of the graphene sheet to be wrapped;

[0058] (3) A tension control device is used to continuously apply a tension of 0.5 N / m to the PI single-sided adhesive film, and an electric rotating device is used to drive the graphene sheet to be wrapped, with one end of the side covered with the PI single-sided adhesive film, to rotate at a speed of 0.1 m / s, so that the PI single-sided adhesive film covers the side of the graphene sheet to be wrapped. The interface of the PI single-sided adhesive film overlaps and fits smoothly by 0.3 mm, and the PI single-sided adhesive film is cut off to complete the wrapping.

[0059] Example 3

[0060] This comparative example provides a method for hemming the periphery of a sheet material, comprising:

[0061] (1) The edge wrapping material is a PI single-sided adhesive film with a thickness of 5 μm, and the sheet to be edge wrapped is a graphene sheet with a size of 20.0 mm*30.0 mm*2.0 mm; the PI single-sided adhesive film is cut as a whole to a width of 2.0 mm, which is the same as the thickness of the graphene sheet to be edge wrapped;

[0062] (2) positioning the cut PI single-sided adhesive film and the graphene sheet to be wrapped at the same height using an adsorption device, and overlapping one end of the cut PI single-sided adhesive film on the side of the graphene sheet to be wrapped, so that the width of the PI single-sided adhesive film is adapted to the thickness of the side of the graphene sheet to be wrapped;

[0063] (3) A tension control device is used to continuously apply a tension of 0.8 N / m to the PI single-sided adhesive film, and an electric rotating device is used to drive the graphene sheet to be wrapped, with one end of the side covered with the PI single-sided adhesive film, to rotate at a speed of 0.2 m / s, so that the PI single-sided adhesive film covers the side of the graphene sheet to be wrapped. The interface of the PI single-sided adhesive film overlaps and fits smoothly by 0.2 mm, and the PI single-sided adhesive film is cut off to complete the wrapping.

[0064] The hemming methods for the perimeter of the sheet provided in Examples 1-3 are shown in Table 1.

[0065] Table 1 Edge wrapping method around the sheet

[0066]

[0067] Test Example 1

[0068] This test example conducts reliability tests on the sheets that have been hemmed in Examples 1-3. The specific method is:

[0069] 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.

[0070] 2. Thermal shock test: The hemmed 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 hemming condition. The results are shown in Table 2.

[0071] Table 2 Hemming reliability of the sheets of Examples 1-3

[0072]

[0073] From the results in Table 2, it can be seen that the hemming method provided in Examples 1-3 hems the periphery 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 provided in the present application can hem the periphery of the graphene sheet efficiently and firmly, thereby achieving the problem of the sheet being broken and chipped after the hemming, and avoiding the excessive increase in the external dimensions of the sheet affecting the assembly application in the product, especially avoiding the use effect of the product requiring high-precision surface contact; and there are fewer processes, high utilization rate of hemming materials, and universal die-cutting tools.

[0074] 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, characterized in that: include: (1) cutting the whole hemming material to a width equal to the thickness of the sheet to be hemmed; (2) positioning the cut edge wrapping material and the sheet to be edge wrapped at the same height, and overlapping and gluing one end of the cut edge wrapping material to the side edge of the sheet to be edge wrapped, so that the width of the edge wrapping material is adapted to the thickness of the side edge of the sheet to be edge wrapped; (3) The sheet to be hemmed with one end of the hemming material attached to the side is rotated so that the hemming material covers the side of the sheet to be hemmed for a circle, the interface positions of the hemming materials overlap and fit smoothly, and the hemming material is cut off to complete the hemming.

2. The hemming method according to claim 1, characterized in that: The step (3) also includes: using a tension control device to continuously apply tension to the hemming material.

3. The hemming method according to claim 2, characterized in that: The tension continuously applied to the hemming material is 0.5-1 N / m.

4. The hemming method according to claim 1, characterized in that: The rotation speed of the sheet in step (3) is 0.1-2 m / s.

5. The hemming method according to claim 1, characterized in that: After step (3), the method further includes: flattening and / or heating the side of the sheet coated with the edging material.

6. The hemming method according to claim 1, characterized in that: Prior to step (1), the method further includes: pre-treating the sheet material to be edge-wrapped; the sheet material comprises graphene material.

7. The hemming method according to claim 6, characterized in that: The pre-treatment of the sheet to be edged includes: flattening the side edges and the upper and lower planes of the sheet to be edged, and performing chip and dust removal treatments.

8. The hemming method according to any one of claims 1 to 3, characterized in that: The edge binding material includes a single-sided adhesive film or a hot-melt adhesive film.

9. The hemming method according to claim 8, characterized in that: The edge binding material is selected from polyimide film, polyester film, polyethylene film or polypropylene film.

10. The hemming method according to claim 9, characterized in that: In the step (3), the interface positions of the edging materials overlap by 0.1-0.5 mm.

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