Cover film for printed circuit board

Abstract

The utility model discloses a cover film for a printed circuit board, which belongs to the technical field of cover films for printed circuit boards, and comprises a base core layer, the bottom of the base core layer is fixedly connected with an adhesive layer used for adhering the cover film to the printed circuit board, the upper side wall of the base core layer is fixedly connected with an insulating layer, and the insulating layer is fixedly connected with the base core layer. The upper side wall of the insulating layer is fixedly connected with a colored composite material layer with a low refractive index, and the upper side wall of the colored composite material layer is fixedly connected with a protective layer. According to the utility model, the insulating layer composed of the anti-static layer and the electromagnetic shielding layer is additionally arranged on the upper surface of the base core layer, so that the device has anti-static and electromagnetic interference blocking functions on a printed circuit board, and the protective layer composed of the flame-retardant layer, the waterproof layer and the wear-resistant layer is additionally arranged; the device has flame-retardant, waterproof and wear-resistant protection functions on the printed circuit board, has more functions, improves the protection effect on the printed circuit board, and prolongs the service life.

Description

Technical Field

[0001] The utility model relates to the technical field of printed circuit board covering films, in particular to a covering film for a printed circuit board. Background Art

[0002] Printed circuit boards are indispensable materials in electronic products. As the demand for consumer electronic products grows, the demand for printed circuit boards is also increasing. As flexible printed circuit boards have the characteristics of flexibility and three-dimensional wiring, they are widely used in computers and their peripherals, communication products, consumer electronic products, etc., driven by the development trend of technological electronic products emphasizing lightness, thinness, shortness and flexibility. Flexible printed circuit boards are mainly composed of copper foil substrates (FCCL) and cover films (CL). Generally, polyimide film is used to make the cover film, or a thin layer of insulating ink is formed as a cover using screen printing technology.

[0003] In the Chinese patented covering film (patent number: CN107896417B), the patented covering film (10) is formed by laminating a first insulating layer (12), a second insulating layer (13), and a thermosetting adhesive layer (14) in sequence on one surface of a supporting film (11), the first insulating layer (12) contains a flame retardant, and the tensile elongation of the laminate (15) composed of the first insulating layer (12), the second insulating layer (13), and the thermosetting adhesive layer (14) without the supporting film (11) is greater than 100%. The device has good processing suitability and operability, and excellent followability to FPC. However, the structure of the device is too simple, and its own functional protection is poor, resulting in insufficient protection for the printed circuit board and a short service life. Utility Model Content

[0004] In view of the above-mentioned technical deficiencies, the purpose of the utility model is to provide a covering film for a printed circuit board. By adding an insulating layer composed of an antistatic layer and an electromagnetic shielding layer, a protective layer and a reinforcing layer composed of a flame retardant layer, a waterproof layer and a wear-resistant layer, the covering film device has the protective functions of antistatic, blocking electromagnetic interference, flame retardancy, waterproofness, wear resistance, and tensile and curling strength for the printed circuit board; it solves the problem that the structure of the device proposed in the background technology is too simple, its own functional protection is poor, resulting in insufficient protection for the printed circuit board and a short service life.

[0005] In order to solve the above technical problems, the utility model adopts the following technical solution: The utility model provides a covering film for a printed circuit board, comprising: a base core layer, the bottom of the base core layer is fixedly connected to an adhesive layer for adhering the covering film to the printed circuit board, the upper side wall of the base core layer is fixedly connected to an insulating layer, the upper side wall of the insulating layer is fixedly connected to a colored composite material layer with a low refractive index, and the upper side wall of the colored composite material layer is fixedly connected to a protective layer.

[0006] Preferably, the insulating layer comprises an antistatic layer fixedly connected to the upper side wall of the base core layer, the upper side wall of the antistatic layer is fixedly connected to an electromagnetic shielding layer, and the upper side wall of the electromagnetic shielding layer is fixedly connected to the colored composite material layer.

[0007] Preferably, the colored composite material layer is composed of epoxy resin, black carbon nanotubes and titanium dioxide gold inorganic materials.

[0008] Preferably, a reinforcement layer with anti-stretching and anti-curling properties is fixedly connected between the colored composite material layer and the protective layer.

[0009] Preferably, the protective layer comprises a flame retardant layer, an upper side wall of the flame retardant layer is fixedly connected to a waterproof layer, and an upper side wall of the waterproof layer is fixedly connected to a wear-resistant layer.

[0010] Preferably, a release film is attached to the side wall of the adhesive layer away from the base core layer.

[0011] The beneficial effects of the utility model are:

[0012] In the utility model, by adding an insulating layer composed of an antistatic layer and an electromagnetic shielding layer on the upper surface of the base core layer, the covering film device can have the functions of antistatic and blocking electromagnetic interference for the printed circuit board; by adding a protective layer composed of a flame retardant layer, a waterproof layer and a wear-resistant layer, the covering film device has the functions of flame retardant, waterproof and wear-resistant for the printed circuit board; by adding a reinforcing layer with anti-stretching and anti-curling properties, the overall anti-stretching and anti-curling strength of the covering film can be improved, so that the device has more functionality and better protective effect, the protective effect on the printed circuit board is improved, and the service life is extended. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0014] Figure 1 It is a three-dimensional structural schematic diagram of the utility model.

[0015] Figure 2 It is a schematic diagram of the three-dimensional structure of the insulating layer in the utility model.

[0016] Figure 3 It is a schematic diagram of the three-dimensional structure of the protective layer in the utility model.

[0017] Explanation of the reference numerals: 1-base core layer, 2-adhesive layer, 3-insulating layer, 301-antistatic layer, 302-electromagnetic shielding layer, 4-colored composite material layer, 5-reinforcement layer, 6-protective layer, 601-flame retardant layer, 602-waterproof layer, 603-wear-resistant layer, 7-release film. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0019] Embodiment 1:

[0020] like Figures 1 to 3 As shown, this embodiment provides a covering film for a printed circuit board, comprising: a base core layer 1, the bottom of the base core layer 1 is fixedly connected to an adhesive layer 2 for adhering the covering film to the printed circuit board, the upper side wall of the base core layer 1 is fixedly connected to an insulating layer 3, the upper side wall of the insulating layer 3 is fixedly connected to a colored composite material layer 4 with a low refractive index, and the upper side wall of the colored composite material layer 4 is fixedly connected to a protective layer 6.

[0021] The insulating layer 3 includes an antistatic layer 301 fixedly connected to the upper side wall of the base core layer 1, which is made of polyester film material and has a good antistatic effect. The upper side wall of the antistatic layer 301 is fixedly connected with an electromagnetic shielding layer 302. The upper side wall of the electromagnetic shielding layer 302 is fixedly connected to the colored composite material layer 4, and is made of metal alloy type electromagnetic shielding film material to block electromagnetic interference.

[0022] The colored composite material layer 4 is composed of epoxy resin, black carbon nanotubes and titanium dioxide gold inorganic materials, is suitable for circuit boards that require shielding circuit patterns, and has excellent folding resistance.

[0023] The protective layer 6 includes a flame retardant layer 601, which is made of a halogen-free flame retardant material and plays a flame retardant protective role. The upper side wall of the flame retardant layer 601 is fixedly connected with a waterproof layer 602, which is made of a TPU polymer waterproof material and has a good waterproof effect. The upper side wall of the waterproof layer 602 is fixedly connected with a wear-resistant layer 603, which adopts a PEEK wear-resistant film material component to improve the wear resistance effect.

[0024] A release film 7 is attached to the side wall of the adhesive layer 2 away from the base core layer 1 to protect the adhesive layer 2 from dust. When in use, the release film 7 can be directly torn off.

[0025] Principle of this embodiment: By adding an insulating layer 3 composed of an antistatic layer 301 and an electromagnetic shielding layer 302 on the upper surface of the base core layer 1, the covering film device can have the functions of antistatic and blocking electromagnetic interference for the printed circuit board. By adding a protective layer 6 composed of a flame retardant layer 601, a waterproof layer 602 and a wear-resistant layer 603, the covering film device has flame retardant, waterproof and wear-resistant protection functions for the printed circuit board, making the device more functional and having a better protective effect, thereby improving the protective effect on the printed circuit board and extending the service life.

[0026] Embodiment 2:

[0027] like Figure 1 As shown, on the basis of retaining all the technical features in the specific embodiment 1, in this embodiment: a reinforcing layer 5 with anti-stretching and anti-curling properties is fixedly connected between the colored composite material layer 4 and the protective layer 6, and a PE film can be used.

[0028] Principle of this embodiment: By adding a reinforcement layer 5 with anti-stretching and anti-curling properties, the overall anti-stretching and anti-curling strength of the covering film can be improved, thereby extending the service life of the device.

[0029] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A cover film for a printed circuit board, characterized in that: include: A base core layer (1), the bottom of the base core layer (1) being fixedly connected to an adhesive layer (2) for adhering a cover film to a printed circuit board, the upper side wall of the base core layer (1) being fixedly connected to an insulating layer (3), the upper side wall of the insulating layer (3) being fixedly connected to a colored composite material layer (4) having a low refractive index, and the upper side wall of the colored composite material layer (4) being fixedly connected to a protective layer (6).

2. The cover film for a printed circuit board according to claim 1, wherein: The insulating layer (3) comprises an antistatic layer (301) fixedly connected to the upper side wall of the base core layer (1), the upper side wall of the antistatic layer (301) is fixedly connected to an electromagnetic shielding layer (302), and the upper side wall of the electromagnetic shielding layer (302) is fixedly connected to a colored composite material layer (4).

3. The cover film for a printed circuit board according to claim 1, wherein: The colored composite material layer (4) is composed of epoxy resin, black nano carbon tubes and titanium dioxide gold inorganic material.

4. The cover film for a printed circuit board according to claim 1, wherein: A reinforcing layer (5) having anti-stretching and anti-curling properties is fixedly connected between the colored composite material layer (4) and the protective layer (6).

5. The cover film for a printed circuit board according to claim 1, wherein: The protective layer (6) comprises a flame retardant layer (601), the upper side wall of the flame retardant layer (601) is fixedly connected to a waterproof layer (602), and the upper side wall of the waterproof layer (602) is fixedly connected to a wear-resistant layer (603).

6. The cover film for a printed circuit board according to claim 1, wherein: A release film (7) is adhered to the side wall of the adhesive layer (2) away from the base core layer (1).

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