New energy single-face double-contact FPC production process

Abstract

The invention relates to the field of FPCs, and discloses a new energy single-face double-contact FPC production process, which comprises the following steps of S1, preparing a covering film material roll and a blackened pure copper foil material roll; s2, windowing the whole roll of the first surface covering film in a roll-to-roll mode by adopting a die cutting process; s3, compounding the blackened pure copper foil with the required width and the die-cut covering film by utilizing an existing coating compounding process to form a composite material roll; s4, curing the composite material roll in the step S3 in a roll-to-roll manner; then baking the cured composite material roll; s5, the composite material roll in the S4 is subjected to bottom film cleaning, and a blackening layer of the window formed in the back face of the composite material roll is cleaned away; s6, double-sided film pressing or coating is conducted on the composite material roll in the step S5 in a roll-to-roll mode through double-sided dry film pressing equipment or photosensitive oil coating equipment; and S7, positioning hole target punching is conducted on the composite material roll in the step S6 in a roll-to-roll mode, and the four positioning holes are located in the four corners of the composite material roll correspondingly.

Description

Technical Field

[0001] The invention relates to the field of FPC, and in particular to a new energy single-sided double-contact FPC production process. Background Art

[0002] Single-sided double-contact FPC is a flexible circuit board with the following characteristics: single-sided wiring, the conductive circuit is only on one side of the substrate; double-contact design, although the circuit is on one side, it is contacted on both sides through vias or special design, which is convenient for connection; At present, there are the following problems in the market: At present, due to the limitation of production process, the roll-to-roll process cannot be realized for the single-sided double-contact FPC of new energy. The traditional sheet material production process is complicated, the manufacturing cost is high, the efficiency is slow, and the quality yield rate is low during the production process; The technical problem to be solved by the present invention is to provide a process capable of realizing roll-to-roll production of single-sided double-contact FPC products. Summary of the invention

[0003] The technical problem to be solved by the present invention is: to provide a process for realizing roll-to-roll production of single-sided double-contact FPC products, which can reduce process costs, reduce production processes, improve production efficiency, and improve product yield; to process the first-side covering film by a die-cutting process, and to open windows and form hole positions in a roll-to-roll manner, in order to prepare for subsequent copper-clad film lamination; to use the existing coating and lamination process to composite the blackened copper foil and the die-cut covering film; to impact the positioning holes by target punching technology, and to use an LDI exposure machine to perform front and back positioning exposure; to use four positioning holes, combined with visual inspection, to align the windows and circuits of the composite material roll.

[0004] A new energy single-sided double-contact FPC production process includes the following steps: S1. Prepare covering film rolls and blackened pure copper foil rolls; S2, firstly, the first side covering film is die-cut by roll-to-roll method, and the whole roll is opened. S3, using the existing coating and laminating process, laminating the blackened pure copper foil of the required width and the die-cut covering film to form a composite material roll; S4, curing the S3 composite material roll in a roll-to-roll manner; and then baking the cured composite material roll; S5, cleaning the bottom film of the composite material roll of S4, and cleaning off the blackened layer of the window on the back side of the composite material roll; S6, using double-sided dry film pressing equipment or photosensitive oil coating equipment, in a roll-to-roll manner, double-sided film pressing or coating of the composite material roll of S5; S7, punching positioning holes on the composite material roll of S6 in a roll-to-roll manner; and the number of positioning holes is four, which are respectively located at the four corners of the composite material roll; S8. Use LDI exposure machine to perform registration exposure in a roll-to-roll manner, using four positioning holes to align the front and back windows and circuits of the composite material roll; S9, developing the composite material roll of S8; etching and demolding the developed composite material roll, and after demolding, performing AOI scanning and target punching in a roll-to-roll manner; Preferably, in step S9, the composite material roll needs to be cleaned; the covering film is laminated in a roll-to-roll manner; the roll-to-roll manner is pressed; and the roll-to-sheet manner is used for cutting, baking, reinforcement, OSP process, shape trimming, and FQC process.

[0005] Preferably, the roll-to-roll method is to unwind the material using an unwinder, process the material while unwinding, and rewind the processed material using a rewinder for use in the next process step.

[0006] Preferably, the baking temperature in step S4 is 165 to 175 degrees, and the baking time is 8 hours.

[0007] Preferably, in step S4, the aging process passes through a plurality of temperature zones in sequence, and the temperature zones include 100 degrees, 120 degrees, and 150 degrees, and the whole aging time is 5 to 6 minutes.

[0008] Preferably, in step S5, the composite material roll is cleaned by using an FPC cleaning line; and in step S9, the composite material roll is cleaned by using an FPC cleaning line.

[0009] Preferably, in step S7, a target punching visual punching machine is used to punch holes in the composite material roll.

[0010] Preferably, in step S9, a double-sided developer is used to develop the composite material roll, and a double-sided vacuum etching and demolding machine is used to etch the composite material roll.

[0011] Compared with the prior art, the beneficial effects of the present invention are as follows: the new energy single-sided double-contact FPC production process of the present invention adopts a die-cutting process to process the first-side covering film, and opens windows to form hole positions in a roll-to-roll manner, in order to prepare for the subsequent copper-clad film composite; the blackened copper foil and the die-cut covering film are composited using the existing coating composite process; the positioning holes are impacted by the target punching technology, and the front and back surfaces are exposed by the LDI exposure machine; four positioning holes are used, combined with visual inspection, to align the windows and lines of the composite material roll.

[0012] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the embodiments of the present invention 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 present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0014] Figure 1 It is a structural schematic diagram of the die-cutting machine of the present invention.

[0015] Figure 2 It is a schematic diagram of the FPC window hole structure of the present invention.

[0016] Figure 3 It is a schematic diagram of the FPC target punching structure of the present invention.

[0017] Figure 4 It is a schematic diagram of the structure of the ripening machine of the present invention.

[0018] Figure 5 It is the FPC production process of the prior art.

[0019] In the figure: 1. Unwinding machine of die-cutting section; 2. Die-cutting machine; 3. Rewinding machine of die-cutting section; 4. Window opening position; 5. Target punching position; 6. Unwinding machine of covering film; 7. Unwinding machine of blackened pure copper foil; 8. Aging machine; 9. Rewinding machine of aging section. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] See also Figures 1 to 5 In an embodiment of the present invention, a new energy single-sided double-contact FPC production process includes the following steps: S1. Prepare covering film rolls and blackened pure copper foil rolls; S2, firstly, the first side covering film is die-cut by roll-to-roll method, and the whole roll is opened with windows; S3, using the existing coating and laminating process, laminating the blackened pure copper foil of the required width and the die-cut covering film to form a composite material roll; S4, curing the S3 composite material roll in a roll-to-roll manner; and then baking the cured composite material roll; S5, cleaning the bottom film of the composite material roll of S4, and cleaning off the blackened layer of the window on the back side of the composite material roll; S6. Double-sided dry film pressing equipment or photosensitive oil coating equipment are used to perform double-sided film pressing or coating on the composite material roll of S5 in a roll-to-roll manner.

[0022] S7. Perform target punching of positioning holes on the composite material roll of S6 in a roll-to-roll manner.

[0023] S8. Use LDI exposure machine for registration exposure in a roll-to-roll manner, using four positioning holes for registration, so that the windows and circuits on the front and back sides of the composite material roll overlap.

[0024] S9, developing the composite material roll of S8; etching and demolding the developed composite material roll, and after demolding, performing AOI scanning and target punching in a roll-to-roll manner; Specifically, prepare the cover film roll and the blackened pure copper foil roll; ensure that the quality of the materials meets the requirements, especially the surface blackening treatment of the copper foil; use the die-cutting process to process the first-side cover film, and open windows in a roll-to-roll manner to form holes, in order to prepare for the subsequent copper film lamination; use the existing coating and lamination process to laminate the blackened copper foil and the die-cut cover film; the lamination process requires precise control of thickness and adhesion to ensure the smooth progress of subsequent processes; the laminated rolls are aged and baked to ensure that the composite film materials are fully bonded and meet the expected performance requirements; clean the bottom film of the composite roll and remove the blackened windows on the back layer, which can improve the quality of subsequent coating and exposure processes and avoid pollution or uneven coating; use lamination equipment or photosensitive oil coating equipment to perform double-sided lamination or coating; ensure that the film layer is uniform and can provide good protection; use target punching technology to impact the positioning holes, which is very important for subsequent alignment exposure to ensure the accuracy of circuit design; use LDI exposure machine for front and back alignment exposure; use four positioning holes, combined with visual inspection, to align the windows and circuits of the composite material roll; after development, etch and strip the film, and finally perform AOI scanning and target punching; AOI scanning can detect defects to ensure that the quality of the product meets the standards.

[0025] Furthermore, in step S9, the composite material roll needs to be cleaned; the covering film is applied in a roll-to-roll manner; the roll-to-roll method is pressed; and the roll-to-sheet method is used for cutting, baking, reinforcement, OSP process, shape trimming, and FQC process.

[0026] Specifically, the cleaning step is to remove any residual impurities or chemicals to ensure that the quality of the film layer or the performance of the circuit board will not be affected in subsequent processes; the cleaning process also helps to remove chemicals left over from the development or etching process to reduce possible contamination; the new cover film is bonded to the composite roll in a roll-to-roll manner; it can protect the circuit layer and provide support for subsequent lamination and cutting; it can ensure the uniformity of the film and avoid bubbles or wrinkles; use lamination equipment to ensure the close combination of the cover film and the composite roll; strictly control pressure and temperature to achieve the best bonding effect; after lamination, the integrity and uniformity of the film layer directly affect the subsequent electrical and physical properties; cutting is to convert the composite roll into the required final size, and cut it in a roll-to-sheet manner to facilitate subsequent use; ensure that the size of each FPC is consistent to avoid waste; baking helps remove residual solvents or moisture, and at the same time The OSP process is to provide corrosion protection for the copper layer and prevent oxidation. OSP is an environmentally friendly process that can effectively protect the surface of the circuit board and improve the conductivity compared with traditional coating technology. The trimming process is to adjust the outer edge of the FPC to ensure that it meets the design requirements, usually including the removal of excess edge material to ensure accuracy and beauty. The last step is the FQC process, which is a final quality inspection of all produced FPCs. FQC will include size inspection, appearance inspection, functional inspection (such as circuit connectivity and electrical performance testing), etc., to ensure that all product indicators meet the standards.

[0027] Furthermore, the roll-to-roll method is to use an unwinder to unwind the material, process the material while unwinding, and use a winder to wind the processed material for use in the next process step.

[0028] Specifically, in the entire production process, the operation mode of the unwinder and the rewinder is adopted, that is, the unwinding and rewinding method is adopted in each required step, so that a longer FPC, such as two meters long, can be processed at one time, while the prior art adopts multiple processing in sheet form; the material is unfolded and processed by the unwinder, and the rewinder is responsible for rewinding the processed material so as to continue to enter the next process, ensuring the continuity and efficiency of the production line; the cooperation of the unwinder and the rewinder is crucial to the roll-to-roll process because they ensure the uniform tension of the material, smooth flow and continuity of processing; the unwinder needs to accurately control the unwinding speed and tension to prevent the material from being over-tensioned or relaxed, while the rewinder must ensure that a certain tension is maintained during the rewinding process to prevent the roll from being uneven; improve production efficiency, can carry out large-scale production continuously, and reduce downtime; save manpower and time, and the automated unwinding and rewinding reduce manual intervention and improve the degree of automation of production; optimize material utilization, and avoid material waste by accurately controlling the tension of the roll.

[0029] Furthermore, the baking temperature of step S4 is 165 degrees to 175 degrees, and the baking time is 8 hours.

[0030] Specifically, in the baking process of step S4, the temperature is controlled between 165°C and 175°C, and the baking time is 8 hours; such temperature and time settings are critical to ensuring sufficient curing of the composite material; too high or too low a temperature, or insufficient baking time, will affect the adhesion of the film layer and the final performance of the material; the main purpose of the baking process is to remove any solvent or moisture, while hardening the material and enhancing its stability; the longer baking time of 8 hours helps ensure that the material is fully cured, reduces residual solvents, and makes the composite film layer stronger and more suitable for subsequent processing and use.

[0031] Furthermore, in step S4, the aging process passes through a plurality of temperature zones in sequence, and the temperature zones include 100 degrees, 120 degrees, and 150 degrees, and the entire aging time is 5 to 6 minutes.

[0032] Specifically, the material passes through multiple temperature zones in sequence, including 100°C, 120°C, and 150°C, and the total aging time is 5 to 6 minutes; the temperature zoning and rapid aging settings help to accurately control the bonding and curing process of the material; by gradually increasing the temperature, it can ensure that the composite film material is gradually fully heat-treated in different temperature ranges, while avoiding damage to the material or uneven curing due to too rapid a temperature increase; 100°C range: used for initial heating to allow the material to begin to adapt to temperature changes; 120°C range: further heating to promote initial bonding of the film layer; 150°C range: reaches the highest temperature, allowing the film material to achieve the best bonding effect in a short time.

[0033] Furthermore, in step S5, the composite material roll is cleaned by using the FPC cleaning line; and in step S9, the composite material roll is cleaned by using the FPC cleaning line.

[0034] Specifically, using an FPC cleaning line to clean the composite material roll can ensure that the material remains clean and pollution-free in each key process link; the cleaning line can usually efficiently remove chemicals, grease, impurities, etc. that may remain in the composite process to ensure the smooth progress of subsequent processes; the use of the FPC cleaning line provides an automated cleaning solution for the production line, reducing manual intervention and improving the cleaning effect; especially after the composite material roll has gone through multiple process links, residues may accumulate on the surface. The use of a cleaning line can ensure the quality of each step and improve the consistency and performance of the final product.

[0035] Furthermore, in step S7, a target punching visual punching machine is used to punch holes in the composite material roll.

[0036] Specifically, the composite material roll is punched using a target punching visual punching machine, which can accurately realize the impact of the positioning hole; the visual punching machine is usually equipped with a high-precision visual system, which can detect the position and alignment of the composite material roll in real time to ensure the accuracy and consistency of the punching; High precision, through real-time monitoring of the visual system, can ensure accurate alignment of the hole positions to avoid deviation; Automation reduces manual intervention, improves production efficiency, and reduces human errors; High consistency can ensure that the hole position of each roll meets the design requirements and ensure the accuracy of the circuit.

[0037] Furthermore, in step S9, a double-sided developer is used to develop the composite material roll, and a double-sided vacuum etching and demolding machine is used to etch the composite material roll.

[0038] Specifically, the double-sided developer can process both sides of the composite roll at the same time to ensure the uniformity and consistency of the development process; it can remove the exposed photosensitive material, leaving only the circuit pattern, and ensure that both sides meet the same quality standards to avoid omissions or unclear patterns; The double-sided vacuum etching and demolding machine uses vacuum technology to achieve uniform etching of the composite material roll; double-sided etching means processing both the front and back sides at the same time, greatly improving production efficiency; ensuring the accuracy of the etching process, and being able to efficiently strip and etch on the surface of both sides of the material at the same time, thereby forming the required circuit pattern.

[0039] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be considered exemplary and non-restrictive in all respects, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention.

Claims

1. A new energy single-sided double-contact FPC production process, characterized in that: The following steps are involved: S1. Prepare covering film rolls and blackened pure copper foil rolls; S2, firstly, the first side covering film is die-cut by roll-to-roll method, and the whole roll is opened with windows; S3, using the existing coating and laminating process, laminating the blackened pure copper foil of the required width and the die-cut covering film to form a composite material roll; S4, curing the S3 composite material roll in a roll-to-roll manner; and then baking the cured composite material roll; S5, cleaning the bottom film of the composite material roll of S4, and cleaning off the blackened layer of the window on the back of the composite material roll; S6, using double-sided dry film pressing equipment or photosensitive oil coating equipment, in a roll-to-roll manner, double-sided film pressing or coating of the composite material roll of S5; S7, punching positioning holes on the composite material roll of S6 in a roll-to-roll manner, and the number of positioning holes is four, which are respectively located at the four corners of the composite material roll; S8. Use LDI exposure machine to perform registration exposure in a roll-to-roll manner, using four positioning holes to align the front and back windows and circuits of the composite material roll; S9, developing the composite material roll of S8; The developed composite material roll is etched and stripped. After stripping, AOI scanning and target punching are performed in a roll-to-roll manner.

2. A new energy single-sided double-contact FPC production process according to claim 1, characterized in that: In step S9, the composite material roll needs to be cleaned, covered with a film in a roll-to-roll manner, pressed in a roll-to-roll manner, and cut, baked, reinforced, OSP, trimmed, and FQC in a roll-to-sheet manner.

3. A new energy single-sided double-contact FPC production process according to claim 1, characterized in that: The roll-to-roll method uses an unwinder to unwind the material, processes the material while unwinding, and uses a rewinder to rewind the processed material for use in the next process step.

4. A new energy single-sided double-contact FPC production process according to claim 1, characterized in that: The baking temperature of step S4 is 165 degrees to 175 degrees, and the baking time is 8 hours.

5. A new energy single-sided double-contact FPC production process according to claim 1, characterized in that: In step S4, the aging process passes through a plurality of temperature zones in sequence, and the temperature zones include 100 degrees, 120 degrees, and 150 degrees, and the whole aging time is 5 to 6 minutes.

6. A new energy single-sided double-contact FPC production process according to claim 1, characterized in that: Step S5 uses the FPC cleaning line to clean the composite material roll; Step S9 uses the FPC cleaning line to clean the composite material roll.

7. A new energy single-sided double-contact FPC production process according to claim 1, characterized in that: Step S7 uses a target punching visual punching machine to punch holes in the composite material roll.

8. A new energy single-sided double-contact FPC production process according to claim 1, characterized in that: In step S9, a double-sided developer is used to develop the composite material roll, and a double-sided vacuum etching and demolding machine is used to etch the composite material roll.

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