CN109413877A - A kind of carbon film spray tin printed circuit board preparation process - Google Patents
A kind of carbon film spray tin printed circuit board preparation process Download PDFInfo
- Publication number
- CN109413877A CN109413877A CN201811065334.1A CN201811065334A CN109413877A CN 109413877 A CN109413877 A CN 109413877A CN 201811065334 A CN201811065334 A CN 201811065334A CN 109413877 A CN109413877 A CN 109413877A
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- China
- Prior art keywords
- brush
- polish
- carbon film
- curing
- cleaning machine
- Prior art date
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- Granted
Links
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 53
- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 53
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 title claims abstract description 52
- 239000007921 spray Substances 0.000 title claims abstract description 49
- 238000002360 preparation method Methods 0.000 title claims abstract description 20
- 238000004140 cleaning Methods 0.000 claims abstract description 51
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 48
- 229910052802 copper Inorganic materials 0.000 claims abstract description 48
- 239000010949 copper Substances 0.000 claims abstract description 48
- 238000001816 cooling Methods 0.000 claims abstract description 14
- 238000007711 solidification Methods 0.000 claims abstract description 13
- 230000008023 solidification Effects 0.000 claims abstract description 13
- 238000003466 welding Methods 0.000 claims abstract description 13
- 238000005507 spraying Methods 0.000 claims abstract description 11
- 238000007788 roughening Methods 0.000 claims abstract description 7
- 229920002972 Acrylic fiber Polymers 0.000 claims abstract description 6
- 239000011248 coating agent Substances 0.000 claims abstract description 6
- 238000000576 coating method Methods 0.000 claims abstract description 6
- 239000003292 glue Substances 0.000 claims abstract description 6
- 239000000758 substrate Substances 0.000 claims abstract description 6
- 230000008676 import Effects 0.000 claims description 20
- 230000005540 biological transmission Effects 0.000 claims description 16
- 238000001035 drying Methods 0.000 claims description 15
- 238000010438 heat treatment Methods 0.000 claims description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 15
- 229920001971 elastomer Polymers 0.000 claims description 13
- 230000007723 transport mechanism Effects 0.000 claims description 13
- 239000003365 glass fiber Substances 0.000 claims description 12
- 239000000806 elastomer Substances 0.000 claims description 10
- 230000007246 mechanism Effects 0.000 claims description 9
- 230000008859 change Effects 0.000 claims description 7
- 239000004744 fabric Substances 0.000 claims description 3
- 230000002093 peripheral effect Effects 0.000 claims description 3
- 239000007787 solid Substances 0.000 claims description 3
- 238000009423 ventilation Methods 0.000 claims description 3
- 239000011159 matrix material Substances 0.000 claims 1
- 238000000034 method Methods 0.000 abstract description 13
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 abstract description 5
- 229910052737 gold Inorganic materials 0.000 abstract description 5
- 239000010931 gold Substances 0.000 abstract description 5
- 239000000047 product Substances 0.000 description 12
- 238000004519 manufacturing process Methods 0.000 description 11
- 230000008569 process Effects 0.000 description 5
- 230000008901 benefit Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 239000012528 membrane Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 240000002834 Paulownia tomentosa Species 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- NRTDAKURTMLAFN-UHFFFAOYSA-N potassium;gold(3+);tetracyanide Chemical compound [K+].[Au+3].N#[C-].N#[C-].N#[C-].N#[C-] NRTDAKURTMLAFN-UHFFFAOYSA-N 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 231100000167 toxic agent Toxicity 0.000 description 1
- 239000003440 toxic substance Substances 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
Classifications
-
- 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
- H05K3/24—Reinforcing the conductive pattern
- H05K3/245—Reinforcing conductive patterns made by printing techniques or by other techniques for applying conductive pastes, inks or powders; Reinforcing other conductive patterns by such techniques
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B1/00—Cleaning by methods involving the use of tools
- B08B1/10—Cleaning by methods involving the use of tools characterised by the type of cleaning tool
- B08B1/12—Brushes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B1/00—Cleaning by methods involving the use of tools
- B08B1/30—Cleaning by methods involving the use of tools by movement of cleaning members over a surface
- B08B1/32—Cleaning by methods involving the use of tools by movement of cleaning members over a surface using rotary cleaning members
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Drying Of Solid Materials (AREA)
- Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
Abstract
A kind of carbon film of the present invention sprays tin printed circuit board preparation process, and its step are as follows: pretreatment: before welding resistance and carbon film printing, carrying out mechanical polish-brush using mechanical polish-brush roughening cleaning machine to copper plate base body and cleans；It prepares printing screen plate: using 220 mesh acrylic fibers halftones, coating 30um thickness block glue；Printing welding resistance: ink is printed on printing screen plate；The printing screen plate with printing ink is imprinted in copper plate base body again；After copper plate base body printing, welding resistance character；Solidification baking: copper plate base body is added to circulating air curing in seven warm areas and is solidified；Spray tin: carrying out spray tin to copper sheet substrate, carries out cooling after spraying tin.The life cycle of the product of this technique preparation is short, and the high pollution of avoiding gold solves the oxidizable difficult point of copper face of common carbon film plate, improves the overall performance and reliability of product.
Description
Technical field
The present invention relates to a kind of carbon films to spray tin printed circuit board preparation process.
Background technique
The remote controler of household electrical appliance, washer control panel etc. all use common carbon film plate, such carbon film plate copper at present
Face moisture-sensitive aoxidizes, and it is bad to eventually lead to product；And the common useization golden plate of high-end product, it is with high costs, change gold
Main raw material(s) used is that gold potassium cyanide is extremely toxic substance, and storage security risk is big, and the waste water generated when production is serious
Environment is polluted, green production generation development trend is not met.It is oxidizable that carbon film plate spray tin then can solve common carbon film plate copper face
The problem of, it is thus also avoided that change the high pollution of gold production.But the high temperature punching of the unbearable spray tin of traditional carbon film printed circuit board
It hits, is easy to fall off.
Present manufacturing enterprise has the drawback that in process of production
1, before welding resistance and carbon film are printed, most of manufacturing enterprises are generally directly produced using paulownia plate, without to the thick of copper face
Rugosity is increased, this be unfavorable for subsequent carbon film printing when carbon film and copper face binding force, and currently without specially to increase
The special equipment of copper face roughness；
2, current carbon film plate needs to carry out solidification work to it after tin spray process process, but currently without specifically for carbon
Diaphragm plate sprays the dedicated curing of tin, and common multistage curing currently on the market can be easy to generate the temperature difference when in use, that is, dry
Road outlet is low with inlet temperature, and drying tunnel central temperature is high, and this temperature difference tends to reach 20 DEG C or more, is unfavorable for carbon film plate most
Solidification effect afterwards.
Summary of the invention
The present invention proposes a kind of carbon film spray tin printed circuit board preparation process regarding to the issue above, avoids environment dirt
Dye, while also reducing production finished product.
Specific technical solution is as follows:
A kind of carbon film spray tin printed circuit board preparation process, its step are as follows:
(1) it pre-processes: before welding resistance and carbon film printing, mechanical polish-brush being carried out using mechanical polish-brush roughening cleaning machine to copper plate base body
Cleaning；
(2) it prepares printing screen plate: using 220 mesh acrylic fibers halftones, coating 30um thickness block glue；
(3) it prints welding resistance: printing ink on printing screen plate；The printing screen plate with printing ink is imprinted on copper plate base body again
On；After copper plate base body printing, welding resistance character；
(4) solidification baking: copper plate base body is added to circulating air curing in seven warm areas and is solidified；
(5) it sprays tin: spray tin is carried out to copper sheet substrate, carry out cooling after spraying tin.
Further, tin is blown using the vertical air knife of high temperature when the spray tin to be coated.
Further, it is cooled down when spray tin is cooling using cooling bed.
Further, the mechanical polish-brush roughening cleaning machine includes cleaning machine shell, transport mechanism, spraying mechanism and mill
Brush roll；
The cleaning machine shell is square body structure, and cleaning machine shell both ends middle position is provided with import and outlet,
Cleaning machine shell both ends bottom is provided with a discharge gate；
The transport mechanism includes conveyer belt and live-roller, and the conveyer belt side enters in cleaning machine shell from the import
Portion, the other side spread out of cleaning machine hull outside from the outlet；The conveyer belt is linked in above the live-roller, the transmission
Roller side is fixedly connected with the cleaning machine shell, and live-roller rotation drives the conveyer belt from import to exporting transmission；
Be provided with fixing seat on the conveyer belt upper surface, the fixing seat quantity be it is multiple, be evenly distributed on the conveyer belt,
The fixing seat is in groove structure, and the fixing seat size, shape are corresponding with copper sheet to be processed；
The spraying mechanism includes water pipeline and spray head, and the water pipeline is fixedly installed on the cleaning machine enclosure interior
Top, the spray head are uniformly installed on the water pipeline bottom, and the spray head is inclined to set；
The polish-brush roller quantity is several, several described polish-brush rollers uniformly divide in the cleaning machine enclosure interior in "-" type
Cloth, the polish-brush roller surface peripheral, oblique are provided with several glass fibre bar brush, and glass fibre bar brush side is provided with bullet
Property block, the elastomer block are fitted in the polish-brush roller surface, the elastomer block section structure triangular in shape, and the polish-brush roller is located at
The conveyer belt top position；When the polish-brush roller rotates, glass fibre bar brush brush overlays on the surface of copper sheet to be processed.
Further, the transfer roller side is provided with transport motor, and the transport motor is fixed on outside cleaning machine shell
Portion one end, the transfer roller side are connect through cleaning machine shell with transport motor, and transport motor drives transfer roller rotation.
Further, polish-brush roller side is provided with polish-brush motor, and the polish-brush motor is fixed on outside cleaning machine shell
Portion one end, polish-brush roller side are connect through cleaning machine shell with polish-brush motor, and polish-brush motor drives the rotation of polish-brush roller.
Further, the polish-brush roller rotation direction is consistent with the live-roller direction.
Further, the water pipeline side connects outer water tube.
Further, valve is provided on the discharge gate.
Further, circulating air curing includes curing shell in seven warm area, transport mechanism, heating tube and
Heat exchanger channels,
The curing shell be it is rectangular, curing shell one end is provided with import, and the other end is provided with outlet, described solid
Change machine enclosure interior is provided with seven sections of drying tunnels, and every section of drying tunnel is connected with each other, and each drying tunnel is internally provided with two heating tubes,
The heating tube is uniformly distributed in the curing enclosure interior in "-" type, described heating tube one end and the curing shell
Inner sidewall is fixedly connected；
The transport mechanism includes conveyer belt and live-roller, and the conveyer belt side enters in curing shell from the import
Portion, the other side spread out of curing hull outside from the outlet；The conveyer belt is linked in above the live-roller, the transmission
Roller side is fixedly connected with the curing shell, and live-roller rotation drives the conveyer belt from import to exporting transmission；
The quantity of the heat exchanger channels is 4, and the heat exchanger channels are in C font structure, and the heat exchanger channels are located at the solidification
Machine two sides inside sidewalls；Heat exchanger channels on the side side wall of curing are 2, in left and right on curing interior side side wall
Be symmetrical arranged, lower section is provided with several gas outlets at the top of the heat exchanger channels, the heat exchanger channels bottom side be provided with into
Port, the air inlet are located at curing shell both ends；Asepwirator pump is provided on the air inlet, the asepwirator pump will dry
Road internal gas sucks heat exchanger channels, then is discharged by the gas outlet of heat exchanger channels.
Further, the heat exchanger channels are fixed on curing side wall by fixed structure, the fixed structure quantity
Be it is multiple, be evenly distributed on the heat exchanger channels；The fixed structure includes fixed frame and fixing piece, and the fixed frame is in
T-type structure, described fixed frame one end are fixedly connected with the curing housing sidewall, and bolt is arranged in other end top and bottom
Hole；The C-shaped structure of fixing piece, bottom and top are provided with flanging, and bolt hole, the fixation are provided on the flanging
Part is linked on ventilation shaft, and cooperates fixing piece to achieve a fixed connection with the bolt hole on fixed frame by bolt and nut, will
Heat exchanger channels are locked on fixed frame.
Further, it is provided on the contact surface of the fixing piece, fixed frame and the heat exchanger channels by rubber elastomer
The buffer layer of composition.
Further, the transfer roller side is provided with transport motor, and the transport motor is fixed on outside curing shell
Portion one end, the transfer roller side are connect through curing shell with transport motor, and transport motor drives transfer roller rotation.
Further, the heating tube is distributed in the conveyer belt lower position.
The invention has the benefit that
Using special transmission and polish-brush structure, transfer roller drives conveyer belt to be transmitted, and the copper sheet of Dai Jiagong passes through recess
Fixing seat it is fixed on a moving belt, the glass fibre bar brush of polish-brush roller surface is on the copper sheet of generation processing during transmission
Surface carries out polish-brush, and the roughness Rz for increasing copper face has reached 2.0 um, the knot of carbon film and copper face when improving the printing of subsequent carbon film
With joint efforts, product is avoided to fall off.
Curing inside temperature will be recycled by increasing by 4 heat exchanger channels, so that drying tunnel internal difference in temperature is dropped to by 20 DEG C
Only 5 DEG C, and coming into full contact with for hot wind and carbon film is increased, carbon film solidification is more thorough, and resistance value is more stable, with copper face binding force
It is higher.Drying tunnel energy consumption is reduced after using interior circulation simultaneously, has saved production cost.
Using 220 mesh acrylic fibers halftones, 30um thickness block glue, easily controllable carbon film print thickness, thus preferably are coated
Control the sheet resistance value of carbon film；
The vertical air knife of high temperature blows tin and carries out coating plus cooling bed cooling, and tin face is uniform, smooth, and heated time is short, substrate and carbon
Membrane damage is smaller, and tin face can place above time and not aoxidize, can long-term stable work under severe conditions.
The life cycle of the product of this technique preparation is short, and the high pollution of avoiding gold solves the copper face of common carbon film plate
Oxidizable difficult point improves the overall performance and reliability of product, by the improvement of production equipment and technique, perfectly by carbon film
It is incorporated in spray two kinds of techniques of tin on a product.Its carbon film resistance value is stablized, and change in resistance is within ± 10%, the key longevity
Life up to 1,000,000 times；Its spray tin is uniform, smooth, completely covers exposed copper face, avoids copper face oxidation, can be severe
Under conditions of continual and steady work (85 DEG C, 85RH%, continuous work 600 hours without exception), while having saved cost, improved
Product competitiveness.
Detailed description of the invention
Fig. 1 is circulating air curing schematic internal view in seven warm areas.
Fig. 2 is A-A in Fig. 1 to diagrammatic cross-section.
Fig. 3 is fixed structure schematic diagram.Fig. 4 is that mechanical polish-brush is roughened cleaning machine schematic internal view.
Fig. 5 is polish-brush roller enlarged drawing in Fig. 4.
Fig. 6 is conveyer belt top view.
Fig. 7 is C-C in Fig. 6 to cross-sectional view.
The B-B direction schematic diagram that Fig. 8 is 4.
Description of symbols:
Mechanical polish-brush roughening cleaning machine 1, cleaning casing 11, import 12, outlet 13, discharge gate 14, valve 15, transport mechanism 16,
Conveyer belt 17, live-roller 18, fixing seat 19, spraying mechanism 110, water pipeline 111, spray head 112, polish-brush roller 113, glass fibre
Bar brush 114, elastomer block 115, transport motor 116, polish-brush motor 117, water pipe 118.
Circulating air curing 2, curing shell 21, import 22, outlet 23, drying tunnel 24, heating tube 25, biography in seven warm areas
Send mechanism 26, conveyer belt 27, live-roller 28, transport motor 29, heat exchanger channels 210, gas outlet 211, air inlet 212, asepwirator pump
213, fixed mechanism 214, fixed frame 215, fixing piece 216, buffer layer 217, fixing piece flanging 218.
Specific embodiment
Clear to be more clear technical solution of the present invention, the present invention is described further with reference to the accompanying drawing,
The technical characteristic of any pair of technical solution of the present invention carries out the scheme that equivalencing is obtained with conventional reasoning and each falls within guarantor of the present invention
Protect range.
A kind of carbon film spray tin printed circuit board preparation process, its step are as follows:
(1) it pre-processes: before welding resistance and carbon film printing, mechanical polish-brush being carried out using mechanical polish-brush roughening cleaning machine to copper plate base body
Cleaning；
(2) it prepares printing screen plate: using 220 mesh acrylic fibers halftones, coating 30um thickness block glue；
(3) it prints welding resistance: printing ink on printing screen plate；The printing screen plate with printing ink is imprinted on copper plate base body again
On；After copper plate base body printing, welding resistance character；
(4) solidification baking: copper plate base body is added to circulating air curing in seven warm areas and is solidified；
(5) it sprays tin: spray tin is carried out to copper sheet substrate, carry out cooling after spraying tin.
Further, tin is blown using the vertical air knife of high temperature when the spray tin to be coated.
Further, it is cooled down when spray tin is cooling using cooling bed.
Further, the mechanical polish-brush roughening cleaning machine includes cleaning machine shell, transport mechanism, spraying mechanism and mill
Brush roll；
The cleaning machine shell is square body structure, and cleaning machine shell both ends middle position is provided with import and outlet,
Cleaning machine shell both ends bottom is provided with a discharge gate；
The transport mechanism includes conveyer belt and live-roller, and the conveyer belt side enters in cleaning machine shell from the import
Portion, the other side spread out of cleaning machine hull outside from the outlet；The conveyer belt is linked in above the live-roller, the transmission
Roller side is fixedly connected with the cleaning machine shell, and live-roller rotation drives the conveyer belt from import to exporting transmission；
Be provided with fixing seat on the conveyer belt upper surface, the fixing seat quantity be it is multiple, be evenly distributed on the conveyer belt,
The fixing seat is in groove structure, and the fixing seat size, shape are corresponding with copper sheet to be processed；
The spraying mechanism includes water pipeline and spray head, and the water pipeline is fixedly installed on the cleaning machine enclosure interior
Top, the spray head are uniformly installed on the water pipeline bottom, and the spray head is inclined to set；
The polish-brush roller quantity is several, several described polish-brush rollers uniformly divide in the cleaning machine enclosure interior in "-" type
Cloth, the polish-brush roller surface peripheral, oblique are provided with several glass fibre bar brush, and glass fibre bar brush side is provided with bullet
Property block, the elastomer block are fitted in the polish-brush roller surface, the elastomer block section structure triangular in shape, and the polish-brush roller is located at
The conveyer belt top position；When the polish-brush roller rotates, glass fibre bar brush brush overlays on the surface of copper sheet to be processed.
Further, the transfer roller side is provided with transport motor, and the transport motor is fixed on outside cleaning machine shell
Portion one end, the transfer roller side are connect through cleaning machine shell with transport motor, and transport motor drives transfer roller rotation.
Further, polish-brush roller side is provided with polish-brush motor, and the polish-brush motor is fixed on outside cleaning machine shell
Portion one end, polish-brush roller side are connect through cleaning machine shell with polish-brush motor, and polish-brush motor drives the rotation of polish-brush roller.
Further, the polish-brush roller rotation direction is consistent with the live-roller direction.
Further, the water pipeline side connects outer water tube.
Further, valve is provided on the discharge gate.
Further, circulating air curing includes curing shell in seven warm area, transport mechanism, heating tube and
Heat exchanger channels,
The curing shell be it is rectangular, curing shell one end is provided with import, and the other end is provided with outlet, described solid
Change machine enclosure interior is provided with seven sections of drying tunnels, and every section of drying tunnel is connected with each other, and each drying tunnel is internally provided with two heating tubes,
The heating tube is uniformly distributed in the curing enclosure interior in "-" type, described heating tube one end and the curing shell
Inner sidewall is fixedly connected；
The transport mechanism includes conveyer belt and live-roller, and the conveyer belt side enters in curing shell from the import
Portion, the other side spread out of curing hull outside from the outlet；The conveyer belt is linked in above the live-roller, the transmission
Roller side is fixedly connected with the curing shell, and live-roller rotation drives the conveyer belt from import to exporting transmission；
The quantity of the heat exchanger channels is 4, and the heat exchanger channels are in C font structure, and the heat exchanger channels are located at the solidification
Machine two sides inside sidewalls；Heat exchanger channels on the side side wall of curing are 2, in left and right on curing interior side side wall
Be symmetrical arranged, lower section is provided with several gas outlets at the top of the heat exchanger channels, the heat exchanger channels bottom side be provided with into
Port, the air inlet are located at curing shell both ends；Asepwirator pump is provided on the air inlet, the asepwirator pump will dry
Road internal gas sucks heat exchanger channels, then is discharged by the gas outlet of heat exchanger channels.
Further, the heat exchanger channels are fixed on curing side wall by fixed structure, the fixed structure quantity
Be it is multiple, be evenly distributed on the heat exchanger channels；The fixed structure includes fixed frame and fixing piece, and the fixed frame is in
T-type structure, described fixed frame one end are fixedly connected with the curing housing sidewall, and bolt is arranged in other end top and bottom
Hole；The C-shaped structure of fixing piece, bottom and top are provided with flanging, and bolt hole, the fixation are provided on the flanging
Part is linked on ventilation shaft, and cooperates fixing piece to achieve a fixed connection with the bolt hole on fixed frame by bolt and nut, will
Heat exchanger channels are locked on fixed frame.
Further, it is provided on the contact surface of the fixing piece, fixed frame and the heat exchanger channels by rubber elastomer
The buffer layer of composition.
Further, the transfer roller side is provided with transport motor, and the transport motor is fixed on outside curing shell
Portion one end, the transfer roller side are connect through curing shell with transport motor, and transport motor drives transfer roller rotation.
Further, the heating tube is distributed in the conveyer belt lower position.
The invention has the benefit that
Using special transmission and polish-brush structure, transfer roller drives conveyer belt to be transmitted, and the copper sheet of Dai Jiagong passes through recess
Fixing seat it is fixed on a moving belt, the glass fibre bar brush of polish-brush roller surface is on the copper sheet of generation processing during transmission
Surface carries out polish-brush, and the roughness Rz for increasing copper face has reached 2.0 um, the knot of carbon film and copper face when improving the printing of subsequent carbon film
With joint efforts, product is avoided to fall off.
Curing inside temperature will be recycled by increasing by 4 heat exchanger channels, so that drying tunnel internal difference in temperature is dropped to by 20 DEG C
Only 5 DEG C, and coming into full contact with for hot wind and carbon film is increased, carbon film solidification is more thorough, and resistance value is more stable, with copper face binding force
It is higher.Drying tunnel energy consumption is reduced after using interior circulation simultaneously, has saved production cost.
Using 220 mesh acrylic fibers halftones, 30um thickness block glue, easily controllable carbon film print thickness, thus preferably are coated
Control the sheet resistance value of carbon film；
The vertical air knife of high temperature blows tin and carries out coating plus cooling bed cooling, and tin face is uniform, smooth, and heated time is short, substrate and carbon
Membrane damage is smaller, and tin face can place above time and not aoxidize, can long-term stable work under severe conditions.
The life cycle of the product of this technique preparation is short, and the high pollution of avoiding gold solves the copper face of common carbon film plate
Oxidizable difficult point improves the overall performance and reliability of product, by the improvement of production equipment and technique, perfectly by carbon film
It is incorporated in spray two kinds of techniques of tin on a product.Its carbon film resistance value is stablized, and change in resistance is within ± 10%, the key longevity
Life up to 1,000,000 times；Its spray tin is uniform, smooth, completely covers exposed copper face, avoids copper face oxidation, can be severe
Under conditions of continual and steady work (85 DEG C, 85RH%, continuous work 600 hours without exception), while having saved cost, improved
Product competitiveness.
Claims (10)
1. a kind of carbon film sprays tin printed circuit board preparation process, its step are as follows:
Pretreatment: before welding resistance and carbon film printing, mechanical polish-brush roughening cleaning machine is used to carry out mechanical polish-brush copper plate base body clear
It washes；
It prepares printing screen plate: using 220 mesh acrylic fibers halftones, coating 30um thickness block glue；
Printing welding resistance: ink is printed on printing screen plate；The printing screen plate with printing ink is imprinted in copper plate base body again；Copper
After the printing of plate matrix, welding resistance character；
Solidification baking: copper plate base body is added to circulating air curing in seven warm areas and is solidified；
Spray tin: carrying out spray tin to copper sheet substrate, carries out cooling after spraying tin.
2. a kind of carbon film as described in claim 1 sprays tin printed circuit board preparation process, it is characterized in that, the spray tin Shi Caiyong
The vertical air knife of high temperature blows tin and is coated.
3. a kind of carbon film as described in claim 1 sprays tin printed circuit board preparation process, it is characterized in that, spray tin uses when cooling
It is cooling bed to be cooled down.
4. a kind of carbon film as described in claim 1 sprays tin printed circuit board preparation process, it is characterized in that, the machinery polish-brush is thick
Changing cleaning machine includes cleaning machine shell, transport mechanism, spraying mechanism and polish-brush roller；
The cleaning machine shell is square body structure, and cleaning machine shell both ends middle position is provided with import and outlet,
Cleaning machine shell both ends bottom is provided with a discharge gate；
The transport mechanism includes conveyer belt and live-roller, and the conveyer belt side enters in cleaning machine shell from the import
Portion, the other side spread out of cleaning machine hull outside from the outlet；The conveyer belt is linked in above the live-roller, the transmission
Roller side is fixedly connected with the cleaning machine shell, and live-roller rotation drives the conveyer belt from import to exporting transmission；
Be provided with fixing seat on the conveyer belt upper surface, the fixing seat quantity be it is multiple, be evenly distributed on the conveyer belt,
The fixing seat is in groove structure, and the fixing seat size, shape are corresponding with copper sheet to be processed；
The spraying mechanism includes water pipeline and spray head, and the water pipeline is fixedly installed on the cleaning machine enclosure interior
Top, the spray head are uniformly installed on the water pipeline bottom, and the spray head is inclined to set；
The polish-brush roller quantity is several, several described polish-brush rollers uniformly divide in the cleaning machine enclosure interior in "-" type
Cloth, the polish-brush roller surface peripheral, oblique are provided with several glass fibre bar brush, and glass fibre bar brush side is provided with bullet
Property block, the elastomer block are fitted in the polish-brush roller surface, the elastomer block section structure triangular in shape, and the polish-brush roller is located at
The conveyer belt top position；When the polish-brush roller rotates, glass fibre bar brush brush overlays on the surface of copper sheet to be processed.
5. a kind of carbon film as claimed in claim 4 sprays tin printed circuit board preparation process, it is characterized in that, the transfer roller side
It is provided with transport motor, the transport motor is fixed on cleaning machine hull outside one end, and cleaning machine is run through in the transfer roller side
Shell is connect with transport motor, and transport motor drives transfer roller rotation.
6. a kind of carbon film as claimed in claim 4 sprays tin printed circuit board preparation process, it is characterized in that, polish-brush roller side
It is provided with polish-brush motor, the polish-brush motor is fixed on cleaning machine hull outside one end, and cleaning machine is run through in polish-brush roller side
Shell is connect with polish-brush motor, and polish-brush motor drives the rotation of polish-brush roller.
7. a kind of carbon film as described in claim 1 sprays tin printed circuit board preparation process, it is characterized in that, it is followed in seven warm area
Ring hot wind curing includes curing shell, transport mechanism, heating tube and heat exchanger channels,
The curing shell be it is rectangular, curing shell one end is provided with import, and the other end is provided with outlet, described solid
Change machine enclosure interior is provided with seven sections of drying tunnels, and every section of drying tunnel is connected with each other, and each drying tunnel is internally provided with two heating tubes,
The heating tube is uniformly distributed in the curing enclosure interior in "-" type, described heating tube one end and the curing shell
Inner sidewall is fixedly connected；
The transport mechanism includes conveyer belt and live-roller, and the conveyer belt side enters in curing shell from the import
Portion, the other side spread out of curing hull outside from the outlet；The conveyer belt is linked in above the live-roller, the transmission
Roller side is fixedly connected with the curing shell, and live-roller rotation drives the conveyer belt from import to exporting transmission；
The quantity of the heat exchanger channels is 4, and the heat exchanger channels are in C font structure, and the heat exchanger channels are located at the solidification
Machine two sides inside sidewalls；Heat exchanger channels on the side side wall of curing are 2, in left and right on curing interior side side wall
Be symmetrical arranged, lower section is provided with several gas outlets at the top of the heat exchanger channels, the heat exchanger channels bottom side be provided with into
Port, the air inlet are located at curing shell both ends；Asepwirator pump is provided on the air inlet, the asepwirator pump will dry
Road internal gas sucks heat exchanger channels, then is discharged by the gas outlet of heat exchanger channels.
8. a kind of carbon film as claimed in claim 7 sprays tin printed circuit board preparation process, it is characterized in that, the heat exchanger channels are logical
Fixed structure is crossed to be fixed on curing side wall, the fixed structure quantity be it is multiple, be evenly distributed on the heat exchanger channels；
The fixed structure includes fixed frame and fixing piece, the T-shaped structure of fixed frame, described fixed frame one end and the solidification
Casing body sidewall is fixedly connected, and bolt hole is arranged in other end top and bottom；The C-shaped structure of fixing piece, bottom and top
Portion is provided with flanging, bolt hole is provided on the flanging, the fixing piece is linked on ventilation shaft, and passes through bolt and nut
Cooperation fixing piece achieves a fixed connection with the bolt hole on fixed frame, and heat exchanger channels are locked on fixed frame.
9. a kind of carbon film as claimed in claim 7 sprays tin printed circuit board preparation process, it is characterized in that, the fixing piece is consolidated
Determine to be provided with the buffer layer being made of rubber elastomer on the contact surface of frame and the heat exchanger channels.
10. a kind of carbon film as claimed in claim 7 sprays tin printed circuit board preparation process, it is characterized in that, the transfer roller one
Side is provided with transport motor, and the transport motor is fixed on curing hull outside one end, and the transfer roller side is through solidification
Casing body is connect with transport motor, and transport motor drives transfer roller rotation.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811065334.1A CN109413877B (en) | 2018-09-13 | 2018-09-13 | Carbon film tin-spraying printed circuit board preparation process |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811065334.1A CN109413877B (en) | 2018-09-13 | 2018-09-13 | Carbon film tin-spraying printed circuit board preparation process |
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| CN109413877A true CN109413877A (en) | 2019-03-01 |
| CN109413877B CN109413877B (en) | 2021-06-29 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114096073A (en) * | 2021-11-10 | 2022-02-25 | 陈巧林 | Baking equipment for semiconductor and circuit board |
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|---|---|
| CN109413877B (en) | 2021-06-29 |
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