Film cutting method for hardened protective film

Abstract

The invention relates to the field of hardened protective films, in particular to a hardened protective film cutting method which comprises the following steps: S100, designing a cutting knife; the angle of the cutting edge of the designed cutting knife is 8-10 degrees from the visual angle that the cutting edge faces an observer; s200, designing the structure of the hardened protective film; the designed hardened protective film sequentially comprises a silica gel layer, a PET (polyethylene terephthalate) layer, an OCA (optical clear adhesive) layer, a hardened PET layer and a protective layer from bottom to top, the thickness of the protective layer is 40-60 [mu] m; the thickness of the silica gel layer is 40-60 microns, and the viscosity of the silica gel layer is 20-40 gf; and S300, a designed cutting knife is used for cutting the designed hardened protective film. By changing the blade point structure of the cutting knife and the design of the structural layer of the hardened protective film, the hardened protective film can be conveniently cut by the cutting knife, an adhesive layer of the hardened protective film cannot be seriously squeezed after cutting, and more sharp sawteeth cannot be formed on the edge of the hardened protective film, so that cutting equipment is simplified, and the cutting efficiency is improved. The technical problem existing when an existing blade cuts a hardened protective film is solved.

Description

Technical Field

[0001] The present invention relates to the field of hardened protective films, and in particular to a method for cutting hardened protective films. Background Art

[0002] Hardened protective film is a protective film that has been hardened. This film usually has extremely high surface hardness and wear resistance, and can effectively protect the surface of the covered object from damage by the external environment. In the electronics industry, especially in the fields of touch screens and displays, hardened protective film is widely used.

[0003] The processing technology of hardened protective film is laser cutting. This equipment is large in size and complicated to operate, which is not convenient for miniaturization. Therefore, the large-size hardened protective film produced needs to be cut.

[0004] At present, the cutting machine uses a blade to cut the hardened protective film, which has the following technical problems:

[0005] 1. When the blade cuts the hardened protective film, the thicker blade squeezes the hardened protective film, which damages the adhesive layer of the hardened protective film. The adhesive layer cannot be exhausted, resulting in bubbles after the hardened protective film is attached to the screen;

[0006] 2. When the blade cuts the hardened protective film, since the surface of the hardened protective film has been hardened and has a hardened layer, ordinary blade cutting will cause serrations on the surface of the hardened protective film. After the hardened protective film is attached to the screen, the cutting serrations on the hardened protective film will make the edges sharp and easily injure the user. Summary of the invention

[0007] In order to solve the above problems, an object of the present invention is to provide a method for cutting a hardened protective film.

[0008] The objective of the present invention is achieved through the following technical solutions:

[0009] The present invention provides a method for cutting a hardened protective film, comprising the following steps:

[0010] S100: Designing a cutting knife; with the blade facing the observer, the blade angle of the designed cutting knife is 8°-10°;

[0011] S200: Designing a hardened protective film structure; the designed hardened protective film includes a silicone layer, a PET layer, an OCA optical adhesive layer, a hardened PET layer, and a protective layer from bottom to top; the protective layer has a thickness of 40-60um; the silicone layer has a thickness of 40-60um and a viscosity of 20-40gf;

[0012] S300: Use the designed cutting knife to cut the designed hardened protective film.

[0013] Furthermore, the cutting knife is made of tungsten steel.

[0014] Furthermore, the processing technology of the cutting knife includes:

[0015] Tungsten steel blade blank material production process;

[0016] Tungsten steel blade finishing process.

[0017] Furthermore, the tungsten steel blade blank material production process includes:

[0018] Batching → fully mixing → crushing → drying → adding molding agent after sieving → drying again → sieving to obtain mixture → mixing granulation → pressing and molding → low-pressure sintering → blank after sintering → inspection → blank size accuracy inspection; the batching is selected according to the applicable requirements of tungsten carbide powder + cobalt powder, and the inspection is non-destructive ultrasonic flaw detection;

[0019] During the pressing process, the blade angle of the cutting knife is set at 8°-10°.

[0020] Furthermore, the finishing process of tungsten steel blades includes:

[0021] Rough sharpening → fine sharpening → qualified products.

[0022] Furthermore, the designed cutting knife has a blade angle of 8°.

[0023] Furthermore, the thickness of the protective layer is 50 um.

[0024] Furthermore, the thickness of the silica gel layer is 50 um.

[0025] Further, the viscosity of the silicone layer was 40 gf.

[0026] Furthermore, the designed hardened protective film also includes a release film layer connected to the silicone layer.

[0027] In the method for cutting the hardened protective film of the present invention, by changing the blade structure of the cutting knife and the design of the structural layer of the hardened protective film, the hardened protective film can be conveniently cut by the cutting knife. After cutting, the adhesive layer of the hardened protective film will not be seriously squeezed and damaged, and a large number of sharp saw teeth will not be formed on the edge of the hardened protective film. The cutting equipment is simplified and the technical problems existing in the existing blade cutting of the hardened protective film are solved. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0029] Figure 1is a flow chart of a film cutting method of a hardened protective film of the present invention;

[0030] Figure 2 It is a structural view of an existing common cutting knife;

[0031] Figure 3 It is a structural view of the cutting knife designed by the present invention;

[0032] Figure 4 It is a layered structure diagram of the hardened protective film designed by the present invention. DETAILED DESCRIPTION

[0033] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0034] like Figure 1 As shown, a method for cutting a hardened protective film according to an embodiment of the present invention comprises the following steps:

[0035] S100: Designing a cutting knife; with the blade facing the observer, the blade angle of the designed cutting knife is 8°-10°;

[0036] S200: Designing a hardened protective film structure; the designed hardened protective film includes a silicone layer, a PET layer, an OCA optical adhesive layer, a hardened PET layer, and a protective layer from bottom to top; the protective layer has a thickness of 40-60um; the silicone layer has a thickness of 40-60um and a viscosity of 20-40gf;

[0037] S300: Use the designed cutting knife to cut the designed hardened protective film.

[0038] In the method for cutting the hardened protective film of the present invention, by changing the blade structure of the cutting knife and the design of the structural layer of the hardened protective film, the hardened protective film can be conveniently cut by the cutting knife. After cutting, the adhesive layer of the hardened protective film will not be seriously squeezed and damaged, and a large number of sharp saw teeth will not be formed on the edge of the hardened protective film. The cutting equipment is simplified and the technical problems existing in the existing blade cutting of the hardened protective film are solved.

[0039] Specifically, the technical solution of the present invention to solve the technical problem is:

[0040] like Figure 2As shown: The blade angle of an ordinary cutting knife is 30°. When the blade cuts the hardened protective film, the thicker the blade is, the rubber layer of the hardened protective film will be squeezed.

[0041] like Figure 3 As shown: the blade angle of the cutting knife blade is improved, and the blade angle of the blade is cut to 8°-10°, preferably 8°, which can effectively reduce the extrusion of the blade on the hardened protective film.

[0042] In order to ensure that the blade angle is reduced while still maintaining its strength and hardness, the improved cutting knife processing process is as follows:

[0043] A: Tungsten steel blade blank material production process

[0044] Batching (select tungsten carbide powder + cobalt powder according to applicable requirements) → fully mix → crush → dry → add molding agent after sieving → dry again → sieve to obtain mixture → mixed granulation → press molding → low-pressure sintering → sintered blank → inspection (non-destructive ultrasonic flaw detection) → blank size accuracy inspection.

[0045] During the press forming process, the cutting knife blade angle is set at 8°.

[0046] B: Tungsten steel blade finishing process

[0047] Rough sharpening → fine sharpening → qualified product. As the tungsten steel material is used, even if the blade angle is reduced, its strength and hardness will not be affected.

[0048] like Figure 4 Shown: is the structure diagram of the hardened protective film, in which the improvements are as follows:

[0049] A: Increase the thickness of the protective film to 40-60um, preferably 50um. When cutting the hardened protective film, the top layer of the protective film is thicker, which can reduce the formation of sawtooth when the hardened protective film is cut by the blade;

[0050] B: The thickness of the silicone layer is increased to 40-60um, preferably 50um. The thickening of the silicone layer can effectively buffer the damage of the blade to the rubber layer;

[0051] C: The viscosity of the silicone layer is increased to more than 20gf, preferably 20-40gf. The viscosity is enhanced, and the silicone layer is only slightly squeezed during the blade cutting process. Due to the increased viscosity, the hardened protective film will not squeeze the silicone layer and cause bubbles after it is attached to the screen.

[0052] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A method for cutting a hardened protective film, comprising the following steps: S100: designing a cutting knife; with the blade facing the observer, the cutting knife is designed with a blade angle of 8°-10°; S200: Designing a hardened protective film structure; the designed hardened protective film includes a silicone layer, a PET layer, an OCA optical adhesive layer, a hardened PET layer, and a protective layer from bottom to top; the protective layer has a thickness of 40-60 um; the silicone layer has a thickness of 40-60 um and a viscosity of 20-40 gf; S300: Use the designed cutting knife to cut the designed hardened protective film.

2. The method for cutting a hardened protective film according to claim 1, characterized in that: The cutting knife is made of tungsten steel.

3. The method for cutting a hardened protective film according to claim 2, characterized in that: The processing technology of the cutting knife includes: Tungsten steel blade blank material production process; Tungsten steel blade finishing process.

4. The method for cutting a hardened protective film according to claim 3, characterized in that: The tungsten steel blade blank material production process includes: Batching → fully mixing → crushing → drying → adding molding agent after sieving → drying again → sieving to obtain mixture → mixing granulation → pressing and molding → low-pressure sintering → blank after sintering → inspection → blank size accuracy inspection; the batching is selected according to the applicable requirements of tungsten carbide powder + cobalt powder, and the inspection is non-destructive ultrasonic flaw detection; During the pressing process, the cutting knife blade angle is set at 8°-10°.

5. The method for cutting a hardened protective film according to claim 3, characterized in that: The tungsten steel blade finishing process includes: Rough sharpening → fine sharpening → qualified products.

6. The method for cutting a hardened protective film according to claim 1, characterized in that: The designed cutting blade angle of the cutting knife is 8°.

7. The method for cutting a hardened protective film according to claim 1, characterized in that: The thickness of the protective layer is 50um.

8. The method for cutting a hardened protective film according to claim 1, characterized in that: The thickness of the silica gel layer is 50 um.

9. The method for cutting a hardened protective film according to claim 1, characterized in that: The viscosity of the silicone layer was 40 gf.

10. The method for cutting a hardened protective film according to claim 1, characterized in that: The designed hardened protective film also includes a release film layer connected to the silicone layer.

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