Composite covering film

Abstract

The utility model relates to the technical field of covering film, especially a kind of composite covering covering film, including PI film, the upper and lower two side end faces of PI film are respectively adhered with metal net and adhering layer, metal net is grounded through wire to play electromagnetic shielding effect, the inside of PI film is nested with reinforcing net, and reinforcing net is used to enhance the tensile strength of PI film;This kind of composite covering covering film solves the mechanical strength shortage of covering film in the prior art.

Description

Technical Field

[0001] This utility model relates to the field of covering film technology, and in particular to a composite covering film. Background Technology

[0002] Existing cover films for printed circuit boards have a relatively simple main structure and insufficient mechanical strength. During processing and use, the cover film is easily deformed due to stretching. In particular, when there is a fault error in the traction equipment, the cover film is easily deformed under the stretching of the traction equipment, resulting in a decrease in the performance of the cover film and failing to effectively play its role in protection and shielding. Utility Model Content

[0003] The purpose of this invention is to address the shortcomings of insufficient mechanical strength in existing covering films by proposing a composite covering film.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] Design a composite covering film, including a PI film, wherein a metal mesh and an adhesive layer are respectively adhered to the upper and lower end faces of the PI film, the metal mesh is grounded through a wire to play an electromagnetic shielding role, and a reinforcing mesh is nested inside the PI film to enhance the tensile strength of the PI film.

[0006] Preferably, the outer periphery of the metal mesh is coated with an insulating coating, which is adhered to the PI film.

[0007] Preferably, the surface of the insulating coating is polished with an opening that exposes a portion of the metal mesh to the air.

[0008] Preferably, a sticker is sealed and affixed to the opening of the opening.

[0009] The composite covering film proposed in this utility model has the following advantages:

[0010] By embedding a reinforcing mesh inside the PI film, the tensile strength of the PI film can be improved; by attaching a metal mesh to the outside of the PI film, not only can the metal mesh play a role in electromagnetic shielding, but the tensile strength of the PI film can also be further improved. Attached Figure Description

[0011] Figure 1 A schematic diagram of the three-dimensional structure with the main body as the core;

[0012] Figure 2 A schematic diagram of the explosive dismantling structure, with the main body as the core.

[0013] Figure 3 A schematic diagram of the cross-sectional structure, with the main body as the core;

[0014] Figure 4 for Figure 3 A magnified structural diagram of area A.

[0015] In the diagram: 1. PI film; 2. Reinforcing mesh; 3. Metal mesh; 4. Insulating coating; 5. Opening; 6. Sticker; 7. Adhesive layer. Detailed Implementation

[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0017] Example 1

[0018] Reference Figures 1-4 A composite covering film includes a PI film 1. A metal mesh 3 and an adhesive layer 7 are respectively adhered to the upper and lower end faces of the PI film 1. The metal mesh 3 is grounded through a wire to provide electromagnetic shielding. A reinforcing mesh 2 is nested inside the PI film 1 to enhance the tensile strength of the PI film 1. The reinforcing mesh 2 is made of polyester (PET).

[0019] Furthermore, refer to Figure 2 , Figure 4 The outer periphery of the metal mesh 3 is coated with an insulating coating 4, which is bonded to the PI film 1. The insulating coating 4 can be made of materials such as epoxy resin or polyphenolic resin, and is formed by coating.

[0020] Furthermore, refer to Figure 2 , Figure 4 The surface of the insulating coating 4 is polished with an opening 5, which exposes part of the metal mesh 3 to the air;

[0021] Furthermore, refer to Figure 2 , Figure 4 The opening of the opening 5 is sealed with a sticker 6.

[0022] Working principle:

[0023] The outer surface of the sticker 6 is covered with a layer of PI film 1 for oxidation detection. The PI film 1 in this area is in direct contact with the outside air. When the PI film 1 in this area shows obvious signs of aging, it indicates that the main PI film 1 has begun to age and can no longer be used. The sticker 6 can not only prevent the outside air from passing through the opening 5 and contacting the metal mesh 3, but also play a role in aging detection.

[0024] In use, the PI film 1 is attached to the printed circuit board through the adhesive layer 7. When electromagnetic shielding is required, a set of stickers 6 is removed, and the exposed metal mesh 3 is connected to the grounding pad on the printed circuit board by soldering through wires. Electromagnetic shielding can then be achieved through the metal mesh 3.

[0025] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A composite covering film, comprising a PI film (1), characterized in that: The PI film (1) has a metal mesh (3) and an adhesive layer (7) attached to its upper and lower end faces respectively. The metal mesh (3) is grounded through a wire to provide electromagnetic shielding. The PI film (1) has a reinforcing mesh (2) nested inside. The reinforcing mesh (2) is used to enhance the tensile strength of the PI film (1).

2. The composite covering film according to claim 1, characterized in that: The outer periphery of the metal mesh (3) is coated with an insulating coating (4), which is adhered to the PI film (1).

3. The composite covering film according to claim 2, characterized in that: The surface of the insulating coating (4) is polished with an opening (5) that exposes part of the metal mesh (3) to the air.

4. A composite covering film according to claim 3, characterized in that: The opening of the opening (5) is sealed with a sticker (6).

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