FPC punching structure with protective film and reinforcement
By setting a give way window on the protective film, the punching knife die is avoided to cut on the protective film, and the protrusions of FPC reinforcement are directly cut off, which solves the problem of frangles on the FPC reinforcement incision edges and improves the process yield.
Patent Information
- Application Number
- CN202421395032.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-18
- Publication Date
- 2025-06-13
- Estimated Expiration
- 2034-06-18
AI Technical Summary
During the FPC appearance processing, the FPC-reinforced cut edges are prone to appearance such as burrs during the second punching and cutting, resulting in the scrapping of FPC monomers.
A give way window is provided on the protective film to prevent the blade of the punching die from cutting onto the protective film, and directly pass through the give way window to cut off the protrusion of the FPC reinforcement.
Through this method, the appearance of the incision edges reinforced by FPC is avoided, and the process yield is improved.
Smart Images
Figure CN222981725U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of flexible printed circuit board production, in particular to an FPC punching structure with a protective film and reinforcement. Background Art
[0002] A flexible printed circuit board, abbreviated as FPC in English, is a printed circuit made by forming circuits on a copper foil through etching with a polyester film (i.e., PET) or a polyimide (i.e., PI) as the substrate, and generally has an FPC reinforcement sheet laminated thereon to reinforce the structural strength of the FPC.
[0003] At present, multiple FPC monomers are provided on an FPC large board. After the circuits of the FPC monomers are processed, FPC reinforcement is laminated. Then, when the FPC is shaped, the first die cutting is performed according to the shape of the FPC monomer. The first die cutting is not covered with a protective film, and only the FPC reinforcement part on the side of the insertion and extraction part protruding from the FPC monomer is left. As for the FPC reinforcement parts in other areas, they coincide with the outer edges of the FPC monomers. After that, before the second die cutting of the protruding FPC reinforcement part, a protective film needs to be additionally attached to the FPC large board and completely cover the FPC reinforcement. However, when the cutting edge of the die used for the second cutting first cuts through the protective film and then continues to cut down the FPC reinforcement, 100% burrs and other appearance defects appear on the cut edge of the FPC reinforcement, resulting in the scrapping of the FPC monomer due to this appearance defect. Summary of the Utility Model
[0004] Therefore, to solve the above problems, the utility model provides an FPC punching structure with a protective film and reinforcement. By providing a relief window on the protective film, the cutting edge of the punching die is prevented from cutting the protective film, and the cutting edge of the punching die passes through the relief window on the protective film, and then directly cuts the protruding part of the FPC reinforcement, thereby avoiding appearance defects such as burrs on the cut edge of the FPC reinforcement and improving the process yield.
[0005] To achieve the above object, the technical solution provided by the utility model is as follows:
[0006] The utility model provides an FPC punching structure with a protective film and reinforcement, including an FPC large board. The FPC large board includes at least 1 FPC monomer, and the FPC monomer is laminated with FPC reinforcement. At least one outer edge of the FPC reinforcement protrudes from the outer edge of the corresponding FPC monomer to form a protruding part; a protective film is attached to the FPC large board, and the protective film has a relief window for the protruding part; the cutting edge line of the punching die corresponds to the outer edge of the protruding part, and during punching, each cutting edge of the punching die passes through the relief window of the protective film that cooperates with it.
[0007] Further, the head and tail of each cutting edge of the punching die are connected to form a corresponding closed die cavity, and the area of the relief window is larger than the area of the die cavity.
[0008] Further, the distance between the die cavity and the relief window is at least 0.5 mm.
[0009] Further, the protective film is a PET protective film.
[0010] Further, the PET protective film is a micro-adhesive film.
[0011] Further, when the number of FPC monomers is multiple, a plurality of adjacent relief windows are connected to form a relief opening.
[0012] Through the technical solution provided by the present utility model, the following beneficial effects are achieved:
[0013] By providing a relief window on the protective film, it is possible to prevent each cutting edge of the punching die from cutting the protective film, and enable each cutting edge of the punching die to pass through the relief window on the protective film, and then directly cut off the protruding part of the FPC reinforcement, thereby avoiding appearance defects such as burrs on the cut edge of the FPC reinforcement, and improving the process yield. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] Figure 1 Shown is a schematic diagram of an FPC punching structure with a protective film and a reinforcement in an embodiment;
[0015] Figure 2 Shown as Figure 1 An enlarged schematic diagram of area A in DETAILED DESCRIPTION OF THE EMBODIMENTS
[0016] To further illustrate the embodiments, the present utility model provides drawings. These drawings are a part of the disclosure of the present utility model, which are mainly used to illustrate the embodiments and can be used to explain the operating principle of the embodiments in conjunction with the relevant descriptions in the specification. With reference to these contents, those of ordinary skill in the art should be able to understand other possible implementation manners and the advantages of the present utility model. The components in the drawings are not drawn to scale, and similar component symbols are usually used to represent similar components.
[0017] The present utility model will be further described below in conjunction with the drawings and the specific embodiments.
[0018] Referring to Figure 1 and Figure 2 shown, this embodiment provides an FPC punching structure with a protective film and a reinforcement (hereinafter simply referred to as the punching structure). The punching structure includes an FPC large board, and the FPC large board includes at least 1 FPC monomer 1, such as Figure 1There are 6 FPC monomers 1 arranged on the shown large FPC board, and they are evenly divided and arranged in two rows.
[0019] The FPC monomer 1 is laminated with an FPC reinforcement 2. One outer edge of the FPC reinforcement 2 protrudes beyond the outer edge of the corresponding FPC monomer 1 to form a protruding portion 21. A protective film is attached to the large FPC board. The protective film has a relief window 3 for the protruding portion 21. The cutting edge line of the punching die corresponds to the outer edge of the protruding portion 21. When punching, each cutting edge of the punching die passes through the relief window 3 of the protective film that mates with it.
[0020] In this embodiment, specifically, the protective film is a slightly sticky PET protective film. Also, the attachment area of the FPC reinforcement 2 corresponds to the gold finger insertion and extraction area of the FPC monomer 1. After the large FPC board is first punched by the die, the protective film with a pre-set relief window 3 is attached to the large FPC board after the first die punching, while ensuring that the relief window 3 of the protective film completely exposes the protruding portion 21 of the FPC reinforcement 2 located below. Then, the second die punching is carried out, and the punching structure during the second die punching is formed as Figure 1 shown.
[0021] By providing a relief window 3 on the protective film, it is possible to prevent each cutting edge of the punching die from cutting the protective film, and to make each cutting edge of the punching die pass through the relief window 3 on the protective film, and then directly cut off the protruding portion 21 of the FPC reinforcement 2, thereby avoiding appearance defects such as burrs on the cut edge of the FPC reinforcement 2 and improving the process yield.
[0022] In another preferred embodiment, the heads and tails of each cutting edge of the punching die used for the second die punching are connected to form a corresponding closed die cavity 4. The area of the relief window 3 is larger than the area of the die cavity 4, so as to ensure that the die cavity 4 of the punching die during the second die punching does not directly touch the protective film, thereby avoiding affecting the punching quality of the FPC reinforcement 2.
[0023] Further preferably, the distance L1 between the die cavity 4 and the relief window 3 is at least 0.5 mm, so as to further ensure that the die cavity 4 does not touch the protective film itself under the combined influence of the attachment tolerance of the protective film and the alignment tolerance of the second die punching.
[0024] In another preferred embodiment, the 6 FPC monomers 1 are arranged in two rows. The relief windows 3 corresponding to the gold finger insertion and extraction areas on the upper side of the FPC monomers 1 in the first row are connected to form a first relief opening 5.
[0025] In addition, the relief windows 3 corresponding to the gold finger insertion and extraction areas on the upper side of the FPC monomers 1 in the second row and the gold finger insertion and extraction areas on the lower side of the FPC monomers 1 in the first row are respectively connected to form a second relief opening 6.
[0026] In this way, by connecting a plurality of adjacent relief windows 3 to each other, corresponding relief openings are respectively formed, so as to simplify the windowing structure of the protective film, with a simple structure and convenient operation.
[0027] Although the present utility model is specifically shown and described in conjunction with preferred embodiments, those skilled in the art should understand that various changes can be made to the present utility model in terms of form and details without departing from the spirit and scope of the present utility model defined by the appended claims, and all of them fall within the protection scope of the present utility model.
Claims
1. An FPC punching structure with a protective film and reinforcement, comprising an FPC large board, wherein the FPC large board comprises at least one FPC monomer, characterized in that: The FPC monomer is pressed with an FPC reinforcement, and at least one outer edge of the FPC reinforcement protrudes from the outer edge of the corresponding FPC monomer to form a protruding portion; The FPC large board is attached with a protective film, which has a clearance window for giving way to the protrusion; the blade line of the punching die corresponds to the outer edge of the protrusion, and during punching, each blade of the punching die passes through the clearance window of the protective film that matches it.
2. The FPC punching structure with a protective film and reinforcement according to claim 1, characterized in that: The blades of the punching die are connected end to end to form a corresponding closed die mold cavity, and the area of the make way window is larger than the area of the die mold cavity.
3. The FPC punching structure with a protective film and reinforcement according to claim 2, characterized in that: The distance between the knife mold cavity and the clearance window is at least 0.5 mm.
4. The FPC punching structure with a protective film and reinforcement according to claim 1, characterized in that: The protective film is a PET protective film.
5. The FPC punching structure with a protective film and reinforcement according to claim 4, characterized in that: The PET protective film is a micro-adhesive film.
6. The FPC punching structure with a protective film and reinforcement according to any one of claims 1 to 5, characterized in that: When the number of the FPC monomers is plural, a plurality of mutually adjacent make way windows are connected to form a make way opening.