CN112676259B - Cleaning process of FPC board containing micro-holes - Google Patents
Cleaning process of FPC board containing micro-holes Download PDFInfo
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- CN112676259B CN112676259B CN202011600875.7A CN202011600875A CN112676259B CN 112676259 B CN112676259 B CN 112676259B CN 202011600875 A CN202011600875 A CN 202011600875A CN 112676259 B CN112676259 B CN 112676259B
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Abstract
The invention discloses a cleaning process of an FPC board containing micro-holes, which mainly cleans dry films in the micro-holes with the diameter of less than 0.15mm through the simple steps of a designed ultrasonic cleaning tank, deionized water pressurized cleaning and drying. Wherein, the ultrasonic cleaning pond divides into two sections processing facilities, and wherein the first half section has the pressurized water stream, and the latter half section has low pressure rivers, has promoted the cleaning efficiency of the dry film in the micropore to do not have the damage to the FPC board. The cleaning process is continuously carried out through the conveyor belt, so that the continuity is good, and the cost is reduced.
Description
Technical Field
The invention relates to the technical field of flexible circuit board manufacturing.
Background
In the FPC production process, some unconventional tiny holes with a diameter of less than 0.15mm may flow into the holes due to the flowing property of the dry film during the dry film circuit process. Firstly, the dry film has viscosity, secondly, the aperture is too small, the surface tension of the liquid medicine of the conventional horizontal film withdrawing line is large, the through hole capability of the liquid medicine is poor, the dry film in the hole cannot be removed, the process capability of producing the small holes by the horizontal film withdrawing line is limited, and the quality risk is increased. This patent proposes to utilize the ultrasonic wave to handle the downthehole dry film of small clearance, the better cleaning ability in space, can play and stop this type and scrap, promotes the effect of aperture production technology ability.
Chinese patent 2016201897911 discloses an ultrasonic cleaning device for PCB board, which comprises an ultrasonic cleaning tank, a high pressure cleaning tank and a drying tank, however, the cleaning device can not effectively clean the dry film in the tiny holes of the PCB board. Chinese patent 2018116548993 discloses an ultrasonic hydrocarbon cleaning agent for PCB board, which can clean and catch up various pollutants on the surface of PCB board and in deep holes and blind holes. However, the ultrasonic hydrocarbon cleaning agent contains a large amount of volatile organic solvents, and is easy to pollute the environment.
At present, no report exists for a cleaning process for dry film impurities contained in micropores of a PFC plate.
Disclosure of Invention
The invention aims to provide a process for cleaning tiny holes of an FPC board, which can clean dry films in the tiny holes and prevent the FPC board from being damaged.
The invention is realized by the following technical scheme:
a cleaning process of an FPC board containing micro-holes comprises the following steps:
step (1): the FPC board containing the micro-holes passes through an ultrasonic cleaning pool through a conveyor belt, wherein the ultrasonic cleaning pool has sound waves with the frequency of 2000000 plus 3000000Hz, the ultrasonic cleaning pool is divided into two sections, the front half section is 50-70% of the length of the ultrasonic cleaning pool, the rear half section is 30-50% of the length of the ultrasonic cleaning pool, the front half section is provided with pressurized water flow with the flow direction forming an included angle of 45-60 degrees with the advancing direction of the FPC board, the rear half section of the ultrasonic cleaning pool is provided with low-pressure water flow, and the treatment time is 15-30 seconds;
step (2): washing the surface of the FPC board by water flow in a cleaning pool, wherein the water flow is deionized water, and the treatment time is 20-40 seconds;
and (3): and (5) drying.
The cleaning liquid of the ultrasonic cleaning pool is selected from an anionic surfactant aqueous solution with the concentration of 0.1-0.4wt%, and the anionic surfactant is at least one of carboxylate, sulfate, sulfonate and phosphate.
Experiments show that the sulfonate/water solution has more excellent permeability, more importantly, the cleaning effect on the dry film is better, and the dry film can be completely washed away by water flow, so that the cleaning liquid of the ultrasonic cleaning pool is preferably the sulfonate/water solution with the concentration of 0.2-0.3 wt%.
The flow velocity of the pressurized water flow in the ultrasonic cleaning pool is 0.75-1.00 m/s, and the flow velocity of the low-pressure water flow is 0.35-0.45 m/s. The water flow has two functions, namely 1 exchanging dirty water of the FPC board accessory and 2 flushing the FPC board to improve the cleaning efficiency (the included angle is 45-60 degrees, so that the flushing of the water flow to the tiny holes can be effectively improved). If the flow rate of the pressurized water flow is too low, the dry membrane in the micropore can not be cleaned completely; if the flow velocity of the pressurized water flow is too fast, experiments show that the cleaning efficiency is not obviously improved, and the damage of the FPC board can be possibly caused.
The aperture of the micro-hole is less than or equal to 0.15 mm.
The micro-holes are internally provided with dry films.
The drying treatment adopts oven drying, and the temperature range is 80-90 ℃.
Compared with the prior art, the invention has the following beneficial effects
1. The ultra-high frequency sound wave with the frequency of 2000000-3000000Hz can clean the micropores with the pore diameter of less than 0.15 mm.
2. The ultrasonic cleaning pool is divided into two sections, the front half section is provided with pressurized water flow/low-pressure water flow for washing, wherein the pressurized water flow and the advancing direction of the FPC board form an included angle of 45-60 degrees, and dry films in micropores can be effectively washed out.
3. The cleaning liquid in the ultrasonic cleaning pool is an anionic surfactant aqueous solution with the concentration of 0.1-0.4wt%, and compared with an organic cleaning liquid and a conventional horizontal film stripping line liquid medicine (the main component is sodium hydroxide), the cleaning effect is good, the environment is not polluted, and no residue is left.
4. The method of the invention is carried out automatically by the conveyor belt, and has high efficiency.
Drawings
FIG. 1: the FPC board advancing direction and the pressurized water flow square clamping angle are schematic diagrams.
Detailed Description
The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the invention, but are not intended to limit the invention in any way. It should be noted that variations and modifications can be made by persons skilled in the art without departing from the spirit of the invention. All falling within the scope of the present invention.
Example 1: the FPC board containing micro holes (the aperture is 0.12-0.15 mm) passes through an ultrasonic cleaning tank (the cleaning solution is 0.1wt% of sodium dodecyl sulfate aqueous solution, the front half section accounts for 60% of the total length), wherein the ultrasonic cleaning tank has sound waves with the frequency of 2000000Hz, the front half section of the ultrasonic cleaning tank has pressurized water flow (the flow rate is 0.75 m/s, the included angle with the advancing direction of the FPC board is 45 degrees), the rear half section of the ultrasonic cleaning tank has low-pressure water flow (the flow rate is 0.45 m/s), and the treatment time is 25 seconds (the lowest treatment time under the process parameters); washing the surface of the FPC board by water flow in a cleaning pool, wherein the water flow is deionized water, and the treatment time is 30 seconds; drying in an oven at 80-90 deg.C.
Examples 2 to 4: the difference from example 1 is that the concentration of the aqueous solution of sodium dodecylsulfate was 0.2wt%, 0.3wt%, 0.4wt%, and the treatment time in the ultrasonic cleaning tank was adjusted to the minimum time of 20 seconds, 18 seconds, and 24 seconds, respectively.
Example 5: the difference from example 1 is that instead of a 0.1% by weight aqueous solution of sodium dodecylsulphonate, a 0.3% strength by weight aqueous solution of sodium stearate anionic surfactant is used, the treatment time in the ultrasonic cleaning bath being adjusted to a minimum of 26 seconds.
Example 6: the difference from example 1 is that the flow rate of the pressurized water flow in the ultrasonic cleaning tank was 1.0 m/sec, and the angle with the forward direction of the FPC board was 60 degrees.
Examples 7 to 8: the difference from example 1 is that the flow rates of the pressurized water flows in the ultrasonic cleaning tank were 0.65 m/s and 1.1 m/s, respectively.
Example 9: the difference from example 1 is that the sonic frequency was 2800000Hz, and the treatment time in the ultrasonic cleaning bath was adjusted to 24 seconds.
Examples 10 to 11: the difference from example 1 is that the first half portion occupies 50% and 70% of the total length, respectively.
Comparative examples 1 to 2: the difference from example 1 is that the angle between the flow direction of the pressurized water flow and the advancing direction of the FPC board was 30 degrees and 90 degrees, respectively, and the treatment time in the ultrasonic cleaning tank was adjusted to 35 seconds.
Comparative example 3: the difference from example 1 is that the acoustic frequency is 20000 Hz.
Comparative example 4: the difference from example 1 is that the first half portion occupies 30% of the total length.
Comparative example 5: immersing the FPC board into an ultrasonic cleaning tank (cleaning solution is 0.1wt% of sodium dodecyl sulfate aqueous solution), wherein sound waves with the frequency of 2000000Hz are generated in the ultrasonic cleaning tank, no water flow exists in the tank, and the treatment time is 25 seconds; washing the surface of the FPC board by water flow in a cleaning pool, wherein the water flow is deionized water, and the treatment time is 30 seconds; drying in an oven at 80-90 deg.C.
The test method comprises the following steps:
(1) whether the dry film in the micropores is cleaned up or not: and observing whether dry films are remained in the micro holes through a microscope.
(2) Whether the FPC board is damaged: automated optical inspection by AOI.
Table 1: test results after cleaning of FPC boards of examples and comparative examples
| Example 1 | Example 2 | Example 3 | Example 4 | Example 5 | Example 6 | Example 7 | Example 8 | |
| Whether the dry film is cleaned up | Is that | Is that | Is that | Is that | Is that | Is that | Is that | Is that |
| Whether or not it is broken | Whether or not | Whether or not | Whether or not | Whether or not | Whether or not | Whether or not | Whether or not | Whether or not |
TABLE 1
| Example 9 | Example 10 | Example 11 | Comparative example 1 | Comparative example 2 | Comparative example 3 | Comparative example 4 | Comparative example 5 | |
| Whether the dry film is cleaned up | Is that | Is that | Is that | Slight residue was found | Slight residue left | Obvious residue is left | Slight residue was found | Obvious residue is left |
| Whether or not it is broken | Whether or not | Whether or not | Whether or not | Whether or not | Whether or not | Whether or not | Whether or not | Whether or not |
From example 1/2/3/4/5, it is clear that the preferred anionic surfactants and amounts thereof can reduce the cleaning time.
As can be seen from the examples, the method of the present invention can effectively remove the dry film in the fine holes without damaging the FPC board.
It can be seen from the comparison example 1/2 that if the angle between the pressurized water flow direction and the advancing direction of the FPC board is not in the range of 45-60 degrees, the technique increases the processing time, and it is difficult to clean the dry film in the minute holes, and if the processing time is further increased, the risk of damaging the FPC board is increased.
As can be seen from comparative example 3, if the frequency of the sound wave is too low, the dry film in the fine pores cannot be completely cleaned.
As can be seen from comparative example 4, if the section of the pressurized water flow in the ultrasonic cleaning tank is less than 50%, the defect of unclean cleaning of the dry membrane in the micro-pores is also caused.
Claims (4)
1. A cleaning process of an FPC board containing micro-holes is characterized by comprising the following steps:
step (1): the FPC board containing the micro-pores passes through an ultrasonic cleaning pool through a conveyor belt, wherein the ultrasonic cleaning pool has sound waves with the frequency of 2000000-3000000Hz, the ultrasonic cleaning pool is divided into two sections, the front half section is 50-70% of the length of the ultrasonic cleaning pool, the rear half section is 30-50% of the length of the ultrasonic cleaning pool, the front half section is provided with pressurized water flow with the flow direction forming an included angle of 45-60 degrees with the advancing direction of the FPC board, the rear half section of the ultrasonic cleaning pool is provided with low-pressure water flow, and the treatment time is 15-30 seconds;
step (2): washing the surface of the FPC board in a cleaning pool by water flow, wherein the water flow is deionized water, and the treatment time is 20-40 seconds;
and (3): drying treatment;
the flow rate of the pressurized water flow is 0.75-1.00 m/s, and the flow rate of the low-pressure water flow is 0.35-0.45 m/s;
the aperture of the micro-hole is less than or equal to 0.15mm, and the micro-hole before cleaning contains a dry film.
2. The process for cleaning an FPC board containing micro holes as defined in claim 1, wherein the cleaning liquid in the ultrasonic cleaning bath is selected from an aqueous solution of an anionic surfactant having a concentration of 0.1-0.4wt%, said anionic surfactant being at least one of carboxylate, sulfate, sulfonate and phosphate.
3. The process for cleaning an FPC board containing micro holes as recited in claim 2, wherein the cleaning liquid of the ultrasonic cleaning tank is a sulfonate/water solution having a concentration selected from a range of 0.2 to 0.3 wt%.
4. The process for cleaning an FPC board having micro holes as claimed in claim 1, wherein the drying process is performed by oven drying at a temperature ranging from 80 to 90 ℃.
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