CN110225669B - Method for improving color change of nickel-plated steel sheet on surface of FPC - Google Patents

Method for improving color change of nickel-plated steel sheet on surface of FPC Download PDF

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CN110225669B
CN110225669B CN201910361609.4A CN201910361609A CN110225669B CN 110225669 B CN110225669 B CN 110225669B CN 201910361609 A CN201910361609 A CN 201910361609A CN 110225669 B CN110225669 B CN 110225669B
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nickel
steel sheet
fpc
plated steel
plasma treatment
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CN110225669A (en
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汤清茹
陈春锦
郑春木
何自立
汪明
刘�文
房彦飞
兰新影
杨志旺
刘慧峰
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Shenzhen Kinwong Electronic Co Ltd
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Shenzhen Kinwong Electronic Co Ltd
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    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05H—PLASMA TECHNIQUE; PRODUCTION OF ACCELERATED ELECTRICALLY-CHARGED PARTICLES OR OF NEUTRONS; PRODUCTION OR ACCELERATION OF NEUTRAL MOLECULAR OR ATOMIC BEAMS
    • H05H1/00—Generating plasma; Handling plasma
    • H05H1/24—Generating plasma
    • H05H1/46—Generating plasma using applied electromagnetic fields, e.g. high frequency or microwave energy
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05H—PLASMA TECHNIQUE; PRODUCTION OF ACCELERATED ELECTRICALLY-CHARGED PARTICLES OR OF NEUTRONS; PRODUCTION OR ACCELERATION OF NEUTRAL MOLECULAR OR ATOMIC BEAMS
    • H05H1/00—Generating plasma; Handling plasma
    • H05H1/24—Generating plasma
    • H05H1/4697—Generating plasma using glow discharges
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K1/00—Printed circuits
    • H05K1/02—Details
    • H05K1/0277—Bendability or stretchability details
    • H05K1/028—Bending or folding regions of flexible printed circuits
    • H05K1/0281—Reinforcement details thereof
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K3/00—Apparatus or processes for manufacturing printed circuits
    • H05K3/22—Secondary treatment of printed circuits

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Plasma & Fusion (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Manufacturing & Machinery (AREA)
  • Electromagnetism (AREA)
  • Other Surface Treatments For Metallic Materials (AREA)
  • Laminated Bodies (AREA)

Abstract

The invention discloses a method for improving the color change of a nickel-plated steel sheet on the surface of an FPC (flexible printed circuit), which comprises the step of carrying out plasma treatment on the FPC combined with the nickel-plated steel sheet and a covering film by adopting nitrogen as a plasma source, compared with the plasma treatment method in the prior art, the nitrogen is used for replacing carbon tetrafluoride and oxygen, the problem that the color of the nickel-plated steel sheet is changed due to hydrofluoric acid generated by the reaction and the pyrolysis of the carbon tetrafluoride and oxygen plasma and a polymer is solved, in addition, the conventional plasma treatment process generally needs more than 60min, the method only needs 20-30min, saves more than half, and improves the processing efficiency. In addition, the nitrogen is used as a plasma source for plasma treatment, so that the hydrophilicity of the surface of the covering film can be improved, the cleanness of the surface of a product is improved, and the surface of the product is passivated, so that the nickel-plated steel sheet and the covering film are combined more tightly.

Description

Method for improving color change of nickel-plated steel sheet on surface of FPC
Technical Field
The invention belongs to the technical field of flexible printed circuit board production, and particularly relates to a method for improving the color change of a nickel-plated steel sheet on the surface of an FPC in a plasma treatment process.
Background
The Flexible Printed Circuit board (FPC for short) is a Printed Circuit board with high reliability and excellent flexibility, which is made of polyimide or polyester film as a substrate, and is usually processed on the surface of the FPC by means of white oil printing, two-dimensional code spray printing, reinforcement sheet sticking and the like, wherein the reinforcement sheet is generally a nickel-plated steel sheet.
Among the prior art, the nickel plating steel sheet reinforcement passes through epoxy and FPC product pressfitting under high temperature, carries out plasma after the pressfitting and handles, spouts the seal two-dimensional code on the FPC surface at last, and plasma treatment is used for getting rid of the pollutant on FPC surface, improves the roughness on FPC product surface simultaneously to reach the purpose that improves product adhesion property and adhesive force, plasma treatment process specifically is: putting the FPC product into a plasma cavity, and filling oxygen and carbon tetrafluoride gas into the reactor, wherein the flow rates of the working gas are respectively as follows: 500cc/min of oxygen and 100cc/min of carbon tetrafluoride. Under the condition of glow discharge, the mixture of oxygen and carbon tetrafluoride is plasma-converted by carbon tetrafluoride and oxygen to produce active radicals, and the principle is as follows:
e-+CF4→CF3++F·+2e-；e-+CF4→CF3·+F·+e-；e-+CF3·→CF2·+F·+e-；e-+CF2·→CF·+F·+e；e-+CF·→C·+F·+e-；O2+e-→2O·+e-；C·+2O·→CO2×) ×; RH → R + H. In the plasma process, molecular chains on the covering film of the FPC product are excited, chemical bonds are broken, and therefore fluorine-containing plasma is introduced to the surface of the material, an etching layer is produced on the surface of the covering film, the roughness of the surface of the covering film is improved, and the adhesive property and the adhesive force of the surface of the product are improved.
According to the reaction principle, oxygen provides O.radical in plasma process, and CF4The generated C.free radical reacts to generate CO2Following plasmaThe C in the sub-cavity decreases, thereby increasing the concentration of fluorine and increasing the progress of the reaction. But the plasma of carbon tetrafluoride and oxygen reacts with the cover film to crack into water vapor, carbon dioxide and a small amount of hydrofluoric acid. When a product combined with a nickel-plated steel sheet and a covering film is processed, the nickel-plated steel sheet on the surface of the product reacts with hydrofluoric acid to cause the color change quality problems of blue and purple on the surface of the steel sheet, so that batch scrapping is caused, and the reaction mechanism is as follows: fe +2HF +8H2O→FeF2·8H2O (cyan) + 2H.
Disclosure of Invention
Therefore, the invention aims to solve the technical problem that the nickel-plated steel sheet is easy to discolor in the plasma treatment process, so that the product quality is low, and therefore, the method for improving the discoloration of the nickel-plated steel sheet on the surface of the FPC in the plasma treatment process is provided.
In order to solve the technical problems, the technical scheme of the invention is as follows:
the invention provides a method for improving the color change of a nickel-plated steel sheet on the surface of an FPC (flexible printed circuit), which comprises the following steps of:
s1, providing the FPC combined with the nickel-plated steel sheet and the covering film;
s2, carrying out plasma treatment on the FPC combined with the nickel-plated steel sheet and the covering film;
during plasma treatment, nitrogen gas was used as the plasma source.
Preferably, the flow rate of the nitrogen gas is 300cc/min, and the plasma treatment time is 20-30 min.
Preferably, the distance between the FPC combined with the nickel-plated steel sheet and the covering film and the electrode is 20-50mm in the plasma treatment process.
Preferably, the FPC to which the nickel-plated steel sheet and the coverlay are bonded has a structure including: covering films are attached to two surfaces of the FPC, and a nickel-plated steel sheet is attached to the surface of one side of the covering film.
Preferably, an epoxy resin layer is arranged between the FPC and the cover film and between the cover film and the nickel-plated steel sheet.
Preferably, the plasma treatment process described in step S2 is performed in a plasma chamber, and a vacuum state is maintained in the plasma treatment process at a degree of vacuum of 30 to 50 Pa.
Preferably, the temperature during the plasma treatment is in the range of 30-50 ℃.
Preferably, the treatment time in the plasma treatment process is 25min, the vacuum degree is 40Pa, and the temperature is 40 ℃.
Compared with the prior art, the technical scheme of the invention has the following advantages:
the method for improving the color change of the nickel-plated steel sheet on the surface of the FPC comprises the step of carrying out plasma treatment on the FPC combined with the nickel-plated steel sheet and the covering film by adopting nitrogen as a plasma source, compared with the plasma treatment method in the prior art, the nitrogen replaces carbon tetrafluoride and oxygen, the problem that the color change of the nickel-plated steel sheet is caused by hydrofluoric acid generated by the reaction and the pyrolysis of the plasma of the carbon tetrafluoride and the oxygen and a polymer is solved, in addition, the conventional plasma treatment process generally needs more than 60min, the method only needs 20-30min, more than half of the time is saved, and the processing efficiency is improved. In addition, the nitrogen is used as a plasma source for plasma treatment, so that the hydrophilicity of the surface of the covering film can be improved, the cleanness of the surface of a product is improved, and the surface of the product is passivated, so that the nickel-plated steel sheet and the covering film are combined more tightly. The method can be widely applied to products with high requirements on adhesive property and adhesive force, and improves the bonding force between the FPC product and PI reinforcement, FR4 reinforcement, character white oil blocks and the like.
Drawings
In order that the present disclosure may be more readily and clearly understood, reference is now made to the following detailed description of the embodiments of the present disclosure taken in conjunction with the accompanying drawings, in which
FIG. 1 is a schematic structural view of an FPC incorporating a nickel-plated steel sheet and a coverlay according to an embodiment of the present invention;
the reference numbers in the figures denote: 1-plating a nickel steel sheet; 2-a cover film; 3-FPC; 4-epoxy resin layer.
Detailed Description
Example 1
The embodiment provides a method for improving the color change of a nickel-plated steel sheet on the surface of an FPC, which is used for improving the color change quality problem that the surface of the nickel-plated steel sheet is blued or purple due to the reaction of the nickel-plated steel sheet and hydrofluoric acid in the plasma treatment process after an FPC product is combined with the nickel-plated steel sheet, so that the color change problem is prevented from influencing the characteristics of the nickel-plated steel sheet, and the quality of a produced product is reduced.
The method comprises the following steps:
s1, laminating the nickel-plated steel sheet 1, the cover film 2 and the FPC3 by a conventional laminating process to form a structure shown in figure 1, wherein the cover films 2 are combined on the top surface and the bottom surface of the FPC3, the nickel-plated steel sheet 1 is combined on the surface of the cover film 2 on the top surface of the FPC3, the nickel-plated steel sheet 1 plays a reinforcing role, and epoxy resin layers 4 are arranged between the FPC3 and the cover film 2 and between the cover film 2 and the nickel-plated steel sheet 1.
S2, carrying out plasma treatment on the FPC3 combined with the nickel-plated steel sheet 1 and the cover film 2: firstly, flatly placing the composite structure in a tray of a plasma machine, conveying the tray into a cavity of the plasma machine, closing an equipment door of the plasma machine, and enabling the FPC3 combined with the nickel-plated steel sheet 1 and the covering film 2 to be 20mm away from an electrode; setting parameters, wherein the parameters are shown in table 1:
TABLE 1
Figure BDA0002046994280000041
Starting a plasma machine, starting to exhaust, forming a vacuum state in the cavity, automatically filling nitrogen into the cavity by the plasma generator according to the program setting, generating an electric field in the cavity by the plasma generator, forming nitrogen plasma, and adopting the following principle: n is a radical of2+e-→2N·+e-；RH→R·+H·；N·+H·→NH·；NH·+H·→NH2·；R·+NH2·→RNH2The generated nitrogen plasma reacts with the surface of the FPC product to play a role in cleaning and passivating the surface, after the plasma guo is finished, the plasma generator automatically stops working according to the program setting, gas and vaporized dirt in the cavity of the plasma machine are discharged, air is introduced into the vacuum chamber to restore air pressure, finally, the door of the plasma machine is opened, the tray is taken out, and the FPC product after plasma treatment is turned toAnd entering the next working procedure.
The plasma source is nitrogen, so that hydrofluoric acid cannot be generated in the process of plasma treatment of a product, the problem of steel sheet discoloration caused by reaction of hydrofluoric acid and a nickel-plated steel sheet is avoided, amino groups are introduced to the surface of the covering film through reaction and are connected to carbon bonds, the introduced amino groups have hydrophilicity, the effects of surface cleaning and passivation are achieved, the direct cleaning effect of pollutants on the surface of the covering film is realized, the surface cleanliness of the product is improved, the adhesive force between an auxiliary material and the surface of the product is improved, and the auxiliary material can be tightly combined with PI reinforcement, FR4 reinforcement, character white oil blocks and the like. Compared with the conventional carbon tetrafluoride and oxygen plasma treatment, the method saves more than half of time and has higher production efficiency.
Example 2
This example provides a method for improving the discoloration of the steel sheet plated with nickel on the surface of the FPC, which is substantially the same as the method described in example 1, except that in this example, the FPC3 with the steel sheet plated with nickel 1 and the coverlay 2 bonded thereto is 50mm away from the electrodes; the parameters during plasma processing are shown in table 2:
TABLE 2
Figure BDA0002046994280000051
Example 3
This example provides a method for improving the discoloration of the steel sheet plated with nickel on the surface of the FPC, which is substantially the same as the method described in example 1, except that in this example, the FPC3 with the steel sheet plated with nickel 1 and the coverlay 2 bonded thereto is 35mm from the electrodes; the parameters during plasma processing are shown in table 3:
TABLE 3
Figure BDA0002046994280000052
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.

Claims (7)

1. A method for improving the color change of a nickel-plated steel sheet on the surface of an FPC is characterized by comprising the following steps:
s1, providing the FPC combined with the nickel-plated steel sheet and the covering film;
s2, carrying out plasma treatment on the FPC combined with the nickel-plated steel sheet and the covering film;
in the plasma treatment process, nitrogen is adopted as a plasma source;
the flow rate of the nitrogen is 300cc/min, and the plasma treatment time is 20-30 min.
2. The method for improving the discoloration of the steel sheet plated with nickel on the surface of the FPC as claimed in claim 1, wherein the distance between the FPC combined with the steel sheet plated with nickel and the coverlay and the electrode during the plasma treatment is 20-50 mm.
3. The method for improving the color change of the FPC surface nickel-plated steel sheet according to claim 2, wherein the FPC with the nickel-plated steel sheet and the cover film combined is characterized in that: covering films are attached to two surfaces of the FPC, and a nickel-plated steel sheet is attached to the surface of one side of the covering film.
4. The method for improving the color change of the FPC surface nickel-plated steel sheet according to claim 3, wherein an epoxy resin layer is arranged between the FPC and the coverlay and between the coverlay and the nickel-plated steel sheet.
5. The method for improving the discoloration of the steel sheet plated with nickel on the surface of the FPC as claimed in claim 4, wherein the plasma treatment process in step S2 is performed in a plasma chamber, and a vacuum degree is maintained in a range of 30-50Pa during the plasma treatment process.
6. The method for improving the discoloration of the steel sheet plated with nickel on the surface of the FPC as recited in claim 5, wherein the temperature during the plasma treatment is 30-50 ℃.
7. The method for improving the color change of the FPC surface nickel-plated steel sheet according to claim 6, wherein the treatment time is 25min, the vacuum degree is 40Pa, and the temperature is 40 ℃ in the plasma treatment process.
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CN111565511A (en) * 2020-06-03 2020-08-21 成都羿发向荣芯能量材料科技有限公司 FPC steel sheet reinforcement optimization method, FPC steel sheet reinforcement structure and electronic equipment

Citations (5)

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Publication number Priority date Publication date Assignee Title
CN1659938A (en) * 2002-06-04 2005-08-24 住友电气工业株式会社 Board for printed wiring, printed wiring board, and method for manufacturing them
CN102316664A (en) * 2010-07-02 2012-01-11 富葵精密组件(深圳)有限公司 Flexible circuit board and manufacture method thereof
CN107343359A (en) * 2017-06-07 2017-11-10 惠州市金百泽电路科技有限公司 A kind of processing method of the pcb board mechanical hole of PTFE material
CN108668467A (en) * 2017-03-31 2018-10-16 可能可特科技（深圳）有限公司 A kind of plasma apparatus for FPC plating
CN109362176A (en) * 2018-12-13 2019-02-19 厦门爱谱生电子科技有限公司 A kind of flexible circuit board and preparation method thereof containing steel disc reinforcement

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Publication number Priority date Publication date Assignee Title
JP5076667B2 (en) * 2007-06-19 2012-11-21 パナソニック株式会社 Plasma processing equipment

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1659938A (en) * 2002-06-04 2005-08-24 住友电气工业株式会社 Board for printed wiring, printed wiring board, and method for manufacturing them
CN102316664A (en) * 2010-07-02 2012-01-11 富葵精密组件(深圳)有限公司 Flexible circuit board and manufacture method thereof
CN108668467A (en) * 2017-03-31 2018-10-16 可能可特科技（深圳）有限公司 A kind of plasma apparatus for FPC plating
CN107343359A (en) * 2017-06-07 2017-11-10 惠州市金百泽电路科技有限公司 A kind of processing method of the pcb board mechanical hole of PTFE material
CN109362176A (en) * 2018-12-13 2019-02-19 厦门爱谱生电子科技有限公司 A kind of flexible circuit board and preparation method thereof containing steel disc reinforcement

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