CN112223909B - Method for cleaning printing screen for circuit board - Google Patents
Method for cleaning printing screen for circuit board Download PDFInfo
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- CN112223909B CN112223909B CN202010908355.6A CN202010908355A CN112223909B CN 112223909 B CN112223909 B CN 112223909B CN 202010908355 A CN202010908355 A CN 202010908355A CN 112223909 B CN112223909 B CN 112223909B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41F—PRINTING MACHINES OR PRESSES
- B41F35/00—Cleaning arrangements or devices
- B41F35/003—Cleaning arrangements or devices for screen printers or parts thereof
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Abstract
The application provides a cleaning method of a printing screen for a circuit board. Adding sodium carbonate into water, heating and stirring to obtain a printing screen cleaning solution, adjusting the liquid temperature of the printing screen cleaning solution to obtain a printing screen flushing solution, matching the printing screen flushing solution with a screen washer to use, and performing two cleaning operations, wherein the motion path of a nozzle in the first cleaning operation comprises a plurality of cross motion paths, and each cross motion path comprises the sum of a transverse cleaning path and a longitudinal cleaning path; the cleaning path in the secondary cleaning operation is set according to the printed pattern of the printing screen for the circuit board and the corner area of the printing screen for the circuit board. The cleaning method of the printing screen for the circuit board can reduce the use of organic solvents, is more environment-friendly and less harmful to operators, and is not easy to leave impurities such as ink and the like in corner gaps of the printing screen.
Description
Technical Field
The invention relates to the technical field of printed circuit board production, in particular to a method for cleaning a printing screen plate for a circuit board.
Background
In the current production process of Printed Circuit Boards (PCBs), the quality of the screen printing plate is directly related to the quality of the produced PCBs, the screen printing plate is an important tool in a solder mask printing process, and has the characteristic of recycling, the screen printing plate needs to be cleaned after recycling, and the main raw material for cleaning the screen printing plate is screen washing water which is used as a cleaning agent for screen printing and workpieces after printing ink is passed through during screen printing.
However, the existing net washing water has large pollution, the waste liquid generated after washing is complex in water treatment process and method, and the treatment cost is relatively high. Meanwhile, the existing net washing water has strong pungent smell and is relatively harmful to the health of operators. In addition, the existing net washing water also has the problems of high stock solution cost, high volatility and flammability, is not beneficial to production and has certain potential safety hazard.
Further, the screen washing water for a printing screen using an organic solvent generally achieves a cleaning effect for the printing screen by operations such as soaking, stirring, and wiping, but impurities such as ink are likely to remain in some corner gaps of the printing screen.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide the method for cleaning the printing screen for the circuit board, which can reduce the use of organic solvents, is more environment-friendly and less harmful to operators and can prevent impurities such as ink and the like from being left in corner gaps of the printing screen.
The purpose of the invention is realized by the following technical scheme:
a cleaning method of a printing screen for a circuit board comprises the following steps:
adding sodium carbonate into water, and heating and stirring to obtain a printing screen cleaning solution;
adjusting the liquid temperature of the printing screen cleaning liquid to 28-32 ℃ to obtain a printing screen washing liquid;
pressurizing the washing liquid of the printing screen and spraying the washing liquid of the printing screen by adopting a nozzle;
setting a first cleaning path of a printing screen for a circuit board, wherein the cleaning path comprises a plurality of transverse cleaning paths and a plurality of longitudinal cleaning paths, the transverse cleaning paths are the same as the length direction of the printing screen for the circuit board, and the longitudinal cleaning paths are the same as the width direction of the printing screen for the circuit board;
the first motion path of the nozzle comprises a plurality of cross motion paths, and each cross motion path comprises the sum of a transverse cleaning path and a longitudinal cleaning path so as to perform the first cleaning operation on the printing screen plate for the circuit board;
Setting a secondary cleaning path of the printing screen for the circuit board according to the printing pattern of the printing screen for the circuit board and the corner area of the printing screen for the circuit board;
and the secondary motion path of the nozzle is the same as the secondary cleaning path of the printing screen plate for the circuit board so as to perform secondary cleaning operation on the printing screen plate for the circuit board.
In one embodiment, the heating temperature in the heating and stirring operation is 20 ℃ to 25 ℃.
In one embodiment, the stirring speed in the heating and stirring operation is 400 r/min-800 r/min.
In one embodiment, the stirring time in the heating and stirring operation is 8 to 12 minutes.
In one embodiment, the mass concentration of the sodium carbonate in the cleaning solution for the printing screen is 1.0-1.4%.
In one embodiment, the spray pressure of the screen printing rinse solution is 1kg/cm2～4kg/cm2。
In one embodiment, the time for the first cleaning operation is 3 minutes to 5 minutes.
In one embodiment, the time of the second cleaning operation is 2 to 4 minutes.
In one embodiment, after the second cleaning operation is performed on the circuit board by using the printing screen, the circuit board by using the printing screen is placed into the printing screen cleaning solution for soaking operation.
In one embodiment, the soaking operation is performed for 6 to 8 minutes.
Compared with the prior art, the invention has at least the following advantages:
1. the cleaning method of the printing screen for the circuit board adopts the sodium carbonate solution as the cleaning solution of the printing screen, the sodium carbonate solution has no volatility and no odor, the working environment and the health of operators cannot be influenced, and the cleaning solution of the printing screen is prepared for use at present, so that the cleaning effect and the cleaning efficiency are improved;
2. the cleaning solution for the printing screen is an incombustible aqueous solution, so that open fire combustion cannot be generated, and the safety is higher;
3. the cleaning method of the printing screen for the circuit board adopts two cleaning operations, the motion path of the nozzle in the first cleaning operation comprises a plurality of crossed motion paths, each crossed motion path comprises the sum of a transverse cleaning path and a longitudinal cleaning path, and the cleaning is carried out through the motion paths which are crossed transversely and longitudinally, so that the printing screen for the circuit board can be cleaned from different angles on one hand, the cleaning area is more comprehensive, and on the other hand, the wetting effect on the area to be cleaned in the printing screen for the circuit board is achieved in the cleaning process, thereby being beneficial to improving the cleaning effect; the cleaning path in the secondary cleaning operation is set according to the printed patterns of the printing screen for the circuit board and the corner areas of the printing screen for the circuit board, so that the cleaning effect of the pattern areas of the printing screen is ensured, and meanwhile, impurities such as ink and the like are not easy to remain in the corner gaps of the printing screen.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
FIG. 1 is a schematic flow chart illustrating a method for cleaning a printing screen for a circuit board according to an embodiment;
FIG. 2 is a schematic diagram showing the transverse path direction and the longitudinal path direction of the cleaning path of the printing screen for circuit boards in one embodiment, wherein Fa denotes the transverse path direction and Fb denotes the longitudinal path direction.
FIG. 3 is a schematic view illustrating a process of recycling waste liquid generated after cleaning the printed circuit board with the halftone;
FIG. 4 is a schematic flow chart illustrating an exemplary method for processing waste cleaning solution from a printing screen for a circuit board;
fig. 5 is a schematic flow chart of another processing method of the waste liquid from the printing screen cleaning of the circuit board shown in fig. 4.
Detailed Description
To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not represent the only embodiments.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
As shown in fig. 1, a method for cleaning a printing screen for a circuit board according to an embodiment includes some or all of the following steps:
s100, adding sodium carbonate into water, and carrying out heating and stirring operation to obtain the printing screen cleaning solution.
In this embodiment, directly mix the dissolution operation with sodium carbonate and water in the washing tank, be about to printing screen printing washing liquid and carry out the present usefulness of joining in marriage, the cleaning performance is better, has guaranteed simultaneously that printing screen printing washing liquid can not become invalid because of the time of setting overlength. The heating and stirring operations can accelerate the dissolution speed of the sodium carbonate in the water, so that the sodium carbonate is dissolved more fully in the water solution.
S200, adjusting the liquid temperature of the cleaning liquid of the printing screen to 28-32 ℃ to obtain the flushing liquid of the printing screen.
In this embodiment, the liquid temperature of the cleaning solution for the printing screen is adjusted to 28 ℃ to 32 ℃ to reach a temperature suitable for dissolving sodium carbonate, so that sodium carbonate is more sufficiently dissolved, and the cleaning solution for the printing screen is kept in a state with a higher cleaning effect, thereby improving the cleaning effect of the cleaning solution for the printing screen.
S300, pressurizing the washing liquid of the printing screen and spraying the washing liquid of the printing screen by adopting a nozzle.
In this embodiment, by pressurizing the printing screen rinse solution and spraying the printing screen rinse solution through the nozzle, the cleaning effect of the printing screen rinse solution on the printing screen can be effectively improved as compared with the conventional cleaning methods such as soaking, stirring, wiping, and the like.
S400, setting a first cleaning path of the printing screen for the circuit board, wherein the cleaning path comprises a plurality of transverse cleaning paths and a plurality of longitudinal cleaning paths, the transverse cleaning paths are the same as the length direction of the printing screen for the circuit board, and the longitudinal cleaning paths are the same as the width direction of the printing screen for the circuit board.
In this embodiment, a first cleaning path of the printing screen for the circuit board is set, where the cleaning path includes a plurality of horizontal cleaning paths and a plurality of vertical cleaning paths, the horizontal cleaning path is the same as the length direction of the printing screen for the circuit board, the vertical cleaning path is the same as the width direction of the printing screen for the circuit board, the direction of the horizontal cleaning path is shown as Fa direction in fig. 2, and the direction of the vertical cleaning path is shown as Fb direction in fig. 2.
S500, the first motion path of the nozzle comprises a plurality of cross motion paths, and each cross motion path comprises the sum of a transverse cleaning path and a longitudinal cleaning path so as to perform the first cleaning operation on the printing screen plate for the circuit board.
In this embodiment, the movement path of the nozzle in the first cleaning operation includes a plurality of crossing movement paths, each crossing movement path including a sum of one lateral cleaning path and one longitudinal cleaning path. The cleaning is carried out through the motion paths which are crossed transversely and longitudinally, on one hand, the printing screen printing plate for the circuit board can be cleaned from different angles, and the cleaning area is more comprehensive. On the other hand, after the cleaning of one cross motion path is finished, the cleaning of the next cross motion path is carried out, and it can be understood that each cross motion path comprises the sum of one transverse cleaning path and one longitudinal cleaning path, and the cross motion paths are not overlapped with each other, so that the situation that impurities among different cleaning paths are repeatedly doped together in the cleaning process is avoided, and the cleaning effect is influenced. The lengths of the plurality of crossed motion paths are gradually shortened from outside to inside on the printing screen, so that the cleaning time is also gradually shortened, and the cleaning efficiency is improved. In addition, adopt a plurality of alternately moving path to wash the operation to printing half tone in proper order, more do benefit to the wetting of printing half tone space of a whole page, and then promote the cleaning performance to printing half tone.
S600, setting a secondary cleaning path of the printing screen plate for the circuit board according to the printing pattern of the printing screen plate for the circuit board and the corner area of the printing screen plate for the circuit board.
In this embodiment, the cleaning path of the printing screen for circuit board is set according to the printed pattern of the printing screen for circuit board and the corner area of the printing screen for circuit board, so that the cleaning effect of the pattern area of the printing screen is ensured and the corner gap of the printing screen is not easy to leave ink and other impurities.
Further, the secondary cleaning path comprises a cleaning path of the printed patterns and a cleaning path of the corner area of the printing screen, the cleaning path of the printed patterns is opposite to the movement direction of the crossed movement path in the primary cleaning operation, namely after the primary cleaning operation is completed, the printed patterns are cleaned again according to the reverse direction of the primary cleaning path. The cleaning path of the corner area of the printing screen is similar to circular motion from the printing pattern to the corner area of the printing screen, so that impurities such as ink and the like are not easy to remain in the corner gap of the printing screen while the cleaning effect of the printing pattern area is ensured.
And S700, the secondary motion path of the nozzle is the same as the secondary cleaning path of the printing screen plate for the circuit board, so that the secondary cleaning operation is carried out on the printing screen plate for the circuit board.
In this embodiment, the secondary movement path of the nozzle is the same as the secondary cleaning path of the printing screen for the circuit board, so that the cleaning effect of the pattern area of the printing screen is ensured, and the corner gaps of the printing screen are not easy to leave impurities such as ink.
It can be understood that the method for cleaning the printing screen for the circuit board adopts the sodium carbonate solution as the cleaning solution for the printing screen, the sodium carbonate solution has no volatility and no odor, the working environment and the health of operators are not affected, and the cleaning solution for the printing screen is prepared at present, so that the cleaning effect and the cleaning efficiency are improved. The cleaning liquid for the printing screen is non-flammable aqueous solution, can not generate open fire combustion, and has higher safety. Furthermore, the cleaning method of the printing screen for the circuit board adopts two times of cleaning operation, the motion path of the nozzle in the first cleaning operation comprises a plurality of crossed motion paths, each crossed motion path comprises the sum of a transverse cleaning path and a longitudinal cleaning path, and the cleaning is carried out through the transverse and longitudinal crossed motion paths, so that on one hand, the printing screen for the circuit board can be cleaned from different angles, the cleaning area is more comprehensive, and on the other hand, the wetting effect on the area to be cleaned in the printing screen for the circuit board is played in the cleaning process, thereby being beneficial to improving the cleaning effect; the cleaning path in the secondary cleaning operation is set according to the printed patterns of the printing screen for the circuit board and the corner areas of the printing screen for the circuit board, so that the cleaning effect of the pattern areas of the printing screen is ensured, and meanwhile, impurities such as ink and the like are not easy to remain in the corner gaps of the printing screen.
It can be understood that, on the motion path of the horizontal and vertical cross, the flushing angle gradually changes, if the included angle between the flushing fluid spraying direction and the printing screen changes, the included angle between the flushing fluid spraying direction and the printing screen ranges from 27 degrees to 80 degrees, in the flushing process, the included angle between the flushing fluid spraying direction and the printing screen slowly decreases progressively, when the flushing is started, the included angle between the flushing fluid spraying direction and the printing screen is larger, at the moment, the pressure applied to the printing screen by the flushing fluid through the nozzle is also larger, so that the impurities on the printing screen are more easily fallen off, after the impurities on the printing screen gradually fall off, the included angle between the flushing fluid spraying direction and the printing screen also slowly decreases progressively, the impurities after the falling off can be more comprehensively flushed away from the printing screen, and further, the nozzle flushes the printing screen cleanly, achieving better cleaning effect.
In one embodiment, before the secondary cleaning operation, an organic solvent is used to wet the printing screen, specifically, the organic solvent is used to perform a wiping operation of cross paths on the surface of the printing screen, the paths are wiped horizontally to wet between two adjacent horizontal cleaning paths, the paths are wiped vertically to wet between two adjacent vertical cleaning paths, and after the entire printing screen is wetted, the printing screen is left standing for 2min to 3 min. In this embodiment, the organic solvent is an organic solvent with low volatility, such as butyl acetate, ethyl acetate, and sodium metasilicate, because of their low volatility, the organic solvent can more completely infiltrate into the bonding position between the deposited oil on the printing screen and the printing screen, so that the deposited oil on the printing screen can partially separate from the printing screen, that is, the adhesion of the deposited oil on the printing screen is reduced, and the deposited oil on the printing screen can be more easily washed away when the printing screen is washed. Meanwhile, the organic solvent with low volatility is adopted to carry out wetting operation on the printing screen, so that the problem that the oil deposit on the printing screen is excessively softened, the adhesion of the oil deposit on the printing screen is increased, and the oil deposit is difficult to completely wash away is avoided.
In one embodiment, the heating temperature in the heating and stirring operation is 20 ℃ to 25 ℃. In this embodiment, the heating temperature in the heating and stirring operation is 20 to 25 ℃, and the solubility of sodium carbonate is affected differently at different temperatures, so that the sodium carbonate can be dissolved in the aqueous solution more sufficiently, thereby improving the cleaning effect of the cleaning solution for the printing screen.
In one embodiment, the stirring speed in the heating and stirring operation is 400 r/min-800 r/min. In this embodiment, the stirring speed during the heating and stirring operation is 400r/min to 800r/min, and through detection and analysis, the sodium carbonate can be more fully dissolved in the aqueous solution within this stirring speed range, so as to improve the cleaning effect of the cleaning solution for the printing screen.
In one embodiment, the stirring time in the heating and stirring operation is 8 to 12 minutes. In this embodiment, the stirring time in the heating and stirring operation is 8 to 12 minutes, so as to avoid the problems of too short stirring time and insufficient dissolution of sodium carbonate, and simultaneously, the sodium carbonate is more quickly dissolved in the aqueous solution, thereby improving the cleaning effect of the printing screen cleaning solution.
In one embodiment, the mass concentration of the sodium carbonate in the cleaning solution for the printing screen is 1.0-1.4%. In this embodiment, the concentration of the heated and stirred sodium carbonate solution is obtained by performing sampling analysis on the heated and stirred sodium carbonate solution, the concentration of the heated and stirred sodium carbonate solution is adjusted according to the concentration of the heated and stirred sodium carbonate solution to a preset concentration of 1.0% to 1.4%, and the cleaning effect of the cleaning solution for the printing screen is the best within the concentration range through detection and analysis.
In one embodiment, the spray pressure of the screen printing rinse solution is 1kg/cm2～4kg/cm2. In this embodiment, the screen printing rinse liquid is discharged through a nozzle in a screen washer, and the pressure of the screen printing rinse liquid is 1kg/cm2～4kg/cm2In the pressure range, on one hand, the printing screen can be cleaned more cleanly and thoroughly, and on the other hand, unnecessary damage to the printing screen due to overhigh screen washing air pressure is avoided.
In one embodiment, the time for the first cleaning operation is 3 minutes to 5 minutes. In this embodiment, the screen washer is used to wash the printing screen, and the washing operation time is 3-5 minutes, so that in this time range, on one hand, the printing screen can be washed more cleanly and thoroughly, and on the other hand, unnecessary damage to the printing screen due to too long washing operation time is avoided.
In one embodiment, the time of the secondary cleaning operation is 2 minutes to 4 minutes. In this embodiment, the screen washer is used to wash the printing screen, and the washing operation time is 2-4 minutes, so that in this time range, on one hand, the printing screen can be washed more cleanly and thoroughly, and on the other hand, unnecessary damage to the printing screen due to too long washing operation time is avoided.
In one embodiment, after the second cleaning operation is performed on the circuit board by using the printing screen, the circuit board by using the printing screen is placed into the printing screen cleaning solution for soaking operation. In the embodiment, the printing screen to be cleaned is placed in the cleaning tank for soaking treatment, so that the problem that a small amount of impurities remain on the cleaned printing screen is avoided, and the cleaning effect of the printing screen is ensured.
In one embodiment, the soaking time is 6 to 8 minutes. In this embodiment, the printing screen to be cleaned is placed in the cleaning tank for soaking, so as to avoid the problem that a small amount of impurities remain on the cleaned printing screen, the time for soaking the printing screen in the cleaning tank is 6 to 8 minutes, and after detection and analysis, the impurities remaining in the printing screen can be completely cleaned within this time range, thereby effectively improving the cleaning effect of the printing screen.
As shown in fig. 3, in one embodiment, the recycling process of the waste liquid generated after the screen printing plate cleaning specifically includes the following steps:
step a1, inputting the alkaline waste liquid generated in the cleaning process of the net washing machine into an alkaline waste liquid storage tank for storage and precipitation to obtain precipitated waste liquid.
And a step a2, conveying the precipitation waste liquid to a filter for filtration, and separating the alkaline waste liquid from the precipitate in the waste liquid to obtain a separated waste liquid.
Step a3, conveying the separated waste liquid to a heating distillation device for heating distillation operation, and volatilizing the organic solvent in the separated waste liquid to obtain the recyclable waste liquid.
And a4, automatically flowing the recyclable waste liquid to a solution collecting box, pumping the recyclable waste liquid into a micro-filter, and recycling the washing liquid after filtering.
Furthermore, the heating distillation device also comprises an organic solvent collecting channel, and the volatilized organic solvent is collected into the organic solvent collecting box and is uniformly and intensively treated.
In this embodiment, the waste liquid generated after the screen printing plate cleaning is subjected to precipitation separation and heating distillation treatment, so that the organic solvent in the waste liquid is also fully removed while impurities in the waste liquid are filtered, and the organic solvent is collected and uniformly treated, thereby ensuring that the waste liquid does not affect the surrounding environment, and realizing the recycling of the screen printing plate cleaning liquid.
In one embodiment, the treatment system for the waste liquid generated after the screen printing plate cleaning further comprises a treatment system, which comprises an adjusting tank for receiving the screen printing plate cleaning waste water and adjusting the water quality and the water quantity, a polymerization reaction tank, an acidification reaction tank, a neutralization reaction tank, a flocculation reaction tank and a filtering tank, wherein the polymerization reaction tank is sequentially arranged at the rear part of the adjusting tank and used for inhibiting the separation of scum after the acid addition, the acidification reaction tank is used for controlling the change of pH value in the acid separation process, the neutralization reaction tank is used for adjusting the change of pH value in the neutralization process, the flocculation reaction tank is used for adding a flocculating agent, and the filtering tank. The polymerization reaction tank, the acidification reaction tank, the neutralization reaction tank, the flocculation reaction tank and the filter tank are connected through pipelines, 3-5 layers of filter screens are further arranged on the filter tank, wherein the mesh sizes of the filter screens are sequentially reduced from the direction from the notch to the tank bottom, so that precipitates are fully separated from the solution, and the efficiency of removing the precipitates is improved. It is understood that in order to prevent the reaction from generating precipitation, stirring and mixing devices are installed in the adjusting tank, the polymerization reaction tank, the acidification reaction tank, the neutralization reaction tank and the flocculation reaction tank. In order to realize the on-line automatic monitoring and feeding of the pH value, pH sensors are also arranged in the acidification reaction tank and the neutralization reaction tank and are connected to a controller to realize the real-time automatic addition.
As shown in FIG. 4, a lift pump is further provided between the drain port of the regulating reservoir and the polymerization reaction tank. The system for treating the screen printing plate cleaning wastewater comprises the following steps:
and b1, adding polymeric ferric sulfate into the screen printing plate cleaning wastewater of the polymerization reaction tank, wherein the addition amount is 600-900 mg/L, and rapidly stirring and mixing for reaction for 3-4 min.
And step b2, adding sulfuric acid into the acidification reaction tank to control the pH value of the acidification reaction tank to be 3-3.5, and fully stirring and mixing for reaction for 7-9 min. Then, adding sodium hydroxide into the neutralization reaction tank to control the pH value of the neutralization reaction tank to be 6.5-9.0, and fully stirring and mixing the mixture for reaction for 3-4 min.
Step b3, adding a polymeric flocculant into the flocculation reaction tank, wherein the dosage of the polymeric flocculant is 6-9 mg/L, and fully stirring, mixing and reacting for 12-14 min.
And b4, in the filter tank, the sediment in the wastewater is fully separated from the solution through the action of gravity and the action of a plurality of layers of filter screens in the filter tank.
Further, in the acidification reaction tank and the neutralization reaction tank, the adding amount of the sulfuric acid and the sodium hydroxide can be controlled on line by a controller according to the real-time change of the pH. The polymerization reaction tank is also provided with a step of adjusting the quality and the quantity of the screen cleaning wastewater through an adjusting tank.
It can be understood that polyferric sulfate (PFS) is added into the cleaning wastewater first, colloidal particles of suspended matters in water are electrically neutralized through polyferric complex ions, the potential is reduced, the colloidal particles in water are rapidly condensed into larger particles, meanwhile, insoluble substances can also react with the PFS in the first time to avoid floating out of the water, so that the purpose of inhibiting scum precipitation after acid addition in the step b2 is achieved, and the sedimentation of particles is accelerated. And b2, adding sulfuric acid, and fully precipitating insoluble substances under acidic conditions from the photosensitive film in the wastewater through an acid precipitation reaction, wherein the optimal pH range is 3-3.5. NaOH is added in the step b3, because the optimal pH range of the flocculation reaction in the subsequent step b4 is 6.5-9.0, the subsequent flocculation agent is convenient to precipitate. And b4, adding a polymeric flocculant to enable the polymer chains of the polymer to have a bridging effect between suspended particles. The bridging is that different chain segments on polymer molecules are adsorbed on different particles, so that the aggregation of the particles is promoted, and the precipitation of the insoluble substances is accelerated. In addition, the polymerization reaction tank, the acidification reaction tank, the neutralization reaction tank and the flocculation reaction tank are all provided with stirring and mixing devices, so that the precipitation of pollutants in the four processes can be prevented.
In this embodiment, by adding polyferric sulfate before the acid precipitation reaction, the screen cleaning waste liquid is not floated on the water surface or in the suspended water after the acid addition reaction, but is completely precipitated, the precipitation of pollutants can be accelerated through the neutralization reaction and the flocculation reaction, and then the pollutants are removed through the dehydration by the sludge dewatering machine. By adopting the design of the multilayer filter tank, the problems of uneven precipitate size and longer precipitation time are solved, the subsequent process of deep separation of the precipitate is reduced, the labor intensity is greatly reduced, and the treatment efficiency is improved.
As shown in fig. 5, in one embodiment, the method for treating the waste liquid from the screen cleaning process may further include the following steps:
and c1, introducing raw water of the screen cleaning wastewater into a raw water collecting tank for water quality balancing operation, and then pumping the raw water into a reaction tank.
And step c2, in the reaction tank, adjusting the pH value of the wastewater subjected to water quality equalization by the raw water collection tank, adding a coagulant into the reaction tank, and stirring and mixing to form a flocculated sludge-water mixed solution.
And step c3, pumping the sludge-water mixed liquor in the reaction tank into a plate-and-frame filter press by using a pump, carrying out solid-liquid separation on the sludge-water mixed liquor, transporting filter residues outwards, and pumping the filtrate into the Fenton oxidation/ultraviolet tank.
And step c4, adding hydrogen peroxide and ferrous sulfate into the filtrate in a Fenton oxidation/ultraviolet pool to carry out Fenton reaction, then sending the wastewater after the oxidation reaction into an ultraviolet light degradation reactor to carry out ultraviolet light degradation on the wastewater, and directly sending the wastewater after the ultraviolet light degradation into an electrolytic cell to carry out the next electrolytic process.
And step c5, adopting a continuous high-frequency pulse electrolysis device in an electrolytic cell, reacting for 0.4-0.9 h, adjusting the pH value of the wastewater after the electrolysis treatment, continuing adding powdered activated carbon particles with the addition amount of 0.6-1.8 mg/L after the pH value of the wastewater reaches 9.8-10, and sending the powdered activated carbon particles into a membrane filtration device by a pump.
And step c6, pumping the wastewater in a membrane filtration device to remove suspended matters and macromolecular substances through the membrane filtration device to obtain membrane filtration wastewater, adjusting the pH value, pumping the membrane filtration wastewater into a biochemical pool, and returning the concentrated solution subjected to membrane filtration to the raw water collection pool in the step c 1.
And c7, performing biochemical treatment on the wastewater obtained in the step c6 to further remove ammonia nitrogen, total phosphorus, COD and SS in the membrane filtration wastewater.
Furthermore, the coagulant is powdery active carbon particles, and the fineness of the powdery active carbon particles is 140-190 meshes. It can be understood that the powdered activated carbon particles are used as a coagulant alone or in cooperation with other coagulants to effectively remove suspended ink and other insoluble macromolecular organic matters, so that large-particle floccules are formed.
In this embodiment, adopt powder activated carbon particle to use as the coagulant alone or interact with other coagulants, can effectively get rid of suspended printing ink and other insoluble macromolecular organic matter, make it form the large granule flocculus, through this technology, the mud-water mixture of its formation easily carries out solid-liquid separation, carries out the filter-pressing in the pressure filter, effectively gets rid of macromolecular insoluble organic matter, the membrane pollution in the follow-up membrane filtration of greatly reduced simultaneously. On the other hand, by adopting Fenton oxidation/ultraviolet and electrolysis processes, ammonia nitrogen, total phosphorus, COD and the like in the wastewater can be effectively removed, macromolecular organic matters are oxidized and degraded to become micromolecular organic matters, the pH value of the wastewater is adjusted between the membrane filtering device and the electrolytic cell, and powdered activated carbon particles are added, so that the process can effectively reduce membrane pollution in subsequent membrane filtration, the membrane filtration efficiency is higher, and the service life of the membrane filtering device in subsequent treatment is greatly prolonged; and then the indexes such as chroma, SS, COD and the like are further reduced through membrane filtration.
The invention also provides a printing screen cleaning solution, which is used in the method for cleaning the printing screen according to any embodiment.
In one embodiment, the preparation method of the screen printing plate cleaning solution comprises the following steps;
adding sodium carbonate into water to perform mixing and dissolving operation to obtain a premixed sodium carbonate solution;
heating and stirring the premixed sodium carbonate solution to obtain a heated and stirred sodium carbonate solution;
analyzing the concentration of sodium carbonate in the heated and stirred sodium carbonate solution, and adjusting the concentration of the heated and stirred sodium carbonate solution to a preset concentration to obtain a sodium carbonate solution with a preset concentration;
and heating the sodium carbonate solution with the preset concentration to a preset temperature to obtain the screen printing plate cleaning solution.
Further, the temperature for heating the sodium carbonate solution is 20 ℃ to 25 ℃.
Further, the stirring time of the sodium carbonate solution is 8 to 12 minutes.
Further, the preset concentration of the heating and stirring sodium carbonate solution is 1.0% -1.4%.
Further, heating the sodium carbonate solution with the preset concentration to a preset temperature of 28-32 ℃.
Example 1
Adding 200L of clean water into a cleaning tank, then adding 2kg of sodium carbonate into the cleaning tank added with the clean water, starting a net washing machine to start tank liquid to heat, stirring the sodium carbonate solution at the temperature of 20 ℃, stirring at the speed of 400r/min for 8 minutes, sampling and analyzing, adjusting the concentration of the sodium carbonate to 1.0%, and adding the required amount of sodium carbonate according to the analysis and adjustment result. The temperature of the bath solution is checked, and the temperature of the bath solution is checked to rise to 28 ℃. Before cleaning a printing screen plate, coating a layer of organic solvent on the surface of the printing screen plate, standing for 1min, putting the printing screen plate into a cleaning tank, setting parameters of a screen washer, and setting the screen washing air pressure to be 1kg/cm 2And cleaning the printing screen for the first time, wherein the screen washing time is set to be 3 minutes. After the first cleaning is finished, continuously carrying out secondary cleaning and washing on the printing screenThe mesh time was set to 2 minutes.
Inputting the alkaline waste liquid generated in the cleaning process of the screen washer into an alkaline waste liquid storage tank for storage and precipitation, then conveying the precipitated waste liquid into a filter for filtration operation, separating the alkaline waste liquid from precipitates in the waste liquid to obtain a separated waste liquid, and conveying the separated waste liquid into a heating distillation device for heating distillation operation to volatilize an organic solvent in the separated waste liquid to obtain a recyclable waste liquid. The recyclable waste liquid automatically flows to the solution collecting box, and is pumped into the micro-filter for filtration, and then the cleaning liquid is recycled. And collecting the volatilized organic solvent into an organic solvent collecting box, and performing unified centralized treatment.
Example 2
Adding 200L of clean water into a cleaning tank, then adding 2.8kg of sodium carbonate into the cleaning tank added with the clean water, starting a net washing machine to start tank liquid to heat, stirring the sodium carbonate solution at 25 ℃, stirring at the speed of 800r/min for 12 minutes, sampling and analyzing, adjusting the concentration of the sodium carbonate to 1.4%, and adding the required amount of sodium carbonate according to the analysis and adjustment result. The temperature of the bath solution is checked, and the temperature of the bath solution is checked to rise to 32 ℃. Before cleaning a printing screen plate, coating a layer of organic solvent on the surface of the printing screen plate, standing for 2min, placing the printing screen plate into a cleaning tank, setting parameters of a screen washer, and setting the screen washing air pressure to be 4kg/cm 2And cleaning the printing screen for the first time, wherein the screen cleaning time is set to be 5 minutes. And after the first cleaning is finished, continuously cleaning the printing screen for the second time, wherein the screen cleaning time is set to be 4 minutes.
Inputting the alkaline waste liquid generated in the cleaning process of the screen washer into an alkaline waste liquid storage tank for storage and precipitation, then conveying the precipitated waste liquid into a filter for filtration operation, separating the alkaline waste liquid from precipitates in the waste liquid to obtain a separated waste liquid, and conveying the separated waste liquid into a heating distillation device for heating distillation operation to volatilize an organic solvent in the separated waste liquid to obtain a recyclable waste liquid. The recyclable waste liquid automatically flows to the solution collecting box, and is pumped into the micro-filter for filtration, and then the cleaning liquid is recycled. And collecting the volatilized organic solvent into an organic solvent collecting box, and performing unified centralized treatment.
Example 3
Adding 200L of clean water into a cleaning tank, then adding 2.4kg of sodium carbonate into the cleaning tank added with the clean water, starting a net washing machine to start tank liquid to heat, stirring the sodium carbonate solution at 23 ℃, stirring at the stirring speed of 600r/min for 10 minutes, sampling and analyzing, adjusting the concentration of the sodium carbonate to 1.2%, and adding the required amount of sodium carbonate according to the analysis and adjustment result. The temperature of the bath solution is checked, and the temperature of the bath solution is checked to rise to 30 ℃. Before cleaning a printing screen plate, coating a layer of organic solvent on the surface of the printing screen plate, standing for 1min, placing the printing screen plate into a cleaning tank, setting parameters of a screen washer, and setting the screen washing air pressure to be 2kg/cm 2And cleaning the printing screen for the first time, wherein the screen cleaning time is set to be 4 minutes. And after the first cleaning is finished, continuously cleaning the printing screen for the second time, wherein the screen cleaning time is set to be 3 minutes.
Inputting the alkaline waste liquid generated in the cleaning process of the screen washer into an alkaline waste liquid storage tank for storage and precipitation, then conveying the precipitated waste liquid into a filter for filtration operation, separating the alkaline waste liquid from precipitates in the waste liquid to obtain a separated waste liquid, and conveying the separated waste liquid into a heating distillation device for heating distillation operation to volatilize an organic solvent in the separated waste liquid to obtain a recyclable waste liquid. The recyclable waste liquid automatically flows to the solution collecting box, and is pumped into the micro-filter for filtration, and then the cleaning liquid is recycled. And collecting the volatilized organic solvent into an organic solvent collecting box, and performing unified centralized treatment.
Example 4
Adding 200L of clean water into a cleaning tank, then adding 2.4kg of sodium carbonate into the cleaning tank added with the clean water, starting a net washing machine to start tank liquid to heat, stirring the sodium carbonate solution at the temperature of 23 ℃, stirring at the speed of 400r/min for 10 minutes, sampling and analyzing, adjusting the concentration of the sodium carbonate to 1.2%, and adding the required amount of sodium carbonate according to the analysis and adjustment result. The temperature of the bath solution is checked, and the temperature of the bath solution is checked to rise to 30 ℃. Before cleaning the printing screen, coating a layer on the surface of the printing screen Standing for 1min, placing the screen printing plate in a cleaning tank, setting parameters of a screen washing machine, and setting the screen washing pressure to be 2kg/cm2And cleaning the printing screen for the first time, wherein the screen cleaning time is set to be 4 minutes. And after the first cleaning is finished, continuously cleaning the printing screen for the second time, wherein the screen cleaning time is set to be 2 minutes.
And adjusting the water quality and the water quantity of wastewater flowing from the cleaning tank through an adjusting tank, adding polymeric ferric sulfate into the screen printing plate cleaning waste liquid of the polymerization reaction tank, wherein the adding amount is calculated according to 600mg/L, and quickly stirring and mixing for reaction for 3 min. Then, adding sulfuric acid into the acidification reaction tank to control the pH value to be 3-3.5, and fully stirring, mixing and reacting for 7 min. Then, adding sodium hydroxide into the neutralization reaction tank to control the pH value of the neutralization reaction tank to be 6.5-9.0, and fully stirring, mixing and reacting for 3 min. Adding polyacrylamide into the flocculation reaction tank, wherein the dosage is calculated according to 6mg/L, and fully stirring, mixing and reacting for 12 min. And finally, in a filter tank, filtering and separating precipitates in the waste liquid through 3 layers of filter screens to obtain the treated waste liquid.
Example 5
Adding 200L of clean water into a cleaning tank, then adding 2kg of sodium carbonate into the cleaning tank added with the clean water, starting a net washing machine to start tank liquid to heat, stirring the sodium carbonate solution at the temperature of 20 ℃, stirring at the speed of 800r/min for 8 minutes, sampling and analyzing, adjusting the concentration of the sodium carbonate to 1.0%, and adding the required amount of sodium carbonate according to the analysis and adjustment result. The temperature of the bath solution is checked, and the temperature of the bath solution is checked to rise to 28 ℃. Before cleaning a printing screen plate, coating a layer of organic solvent on the surface of the printing screen plate, standing for 1min, putting the printing screen plate into a cleaning tank, setting parameters of a screen washer, and setting the screen washing air pressure to be 1kg/cm 2And cleaning the printing screen for the first time, wherein the screen washing time is set to be 3 minutes. And after the first cleaning is finished, continuously cleaning the printing screen for the second time, wherein the screen cleaning time is set to be 4 minutes.
Adjusting the water quality and the water quantity of wastewater flowing from the cleaning tank through an adjusting tank, adding polymeric ferric sulfate into the screen printing plate cleaning waste liquid of the polymerization reaction tank, wherein the adding quantity is 900mg/L, and quickly stirring and mixing for reaction for 4 min. Then, adding sulfuric acid into the acidification reaction tank to control the pH value to be 3-3.5, and fully stirring, mixing and reacting for 9 min. Then, adding sodium hydroxide into the neutralization reaction tank to control the pH value of the neutralization reaction tank to be 6.5-9.0, and fully stirring, mixing and reacting for 4 min. Adding polyacrylamide into the flocculation reaction tank, wherein the dosage is calculated according to 6mg/L, and fully stirring, mixing and reacting for 14 min. And finally, in a filter tank, filtering and separating precipitates in the waste liquid through 5 layers of filter screens to obtain the treated waste liquid.
Example 6
Adding 200L of clean water into a cleaning tank, then adding 2kg of sodium carbonate into the cleaning tank added with the clean water, starting a net washing machine to start tank liquid to heat, stirring the sodium carbonate solution at the temperature of 20 ℃, stirring at the stirring speed of 600r/min for 8 minutes, sampling and analyzing, adjusting the concentration of the sodium carbonate to 1.0%, and adding the required amount of sodium carbonate according to the analysis and adjustment result. The temperature of the bath solution is checked, and the temperature of the bath solution is checked to rise to 28 ℃. Before cleaning a printing screen plate, coating a layer of organic solvent on the surface of the printing screen plate, standing for 1min, putting the printing screen plate into a cleaning tank, setting parameters of a screen washer, and setting the screen washing air pressure to be 1kg/cm 2And cleaning the printing screen for the first time, wherein the screen cleaning time is set to be 3 minutes. And after the first cleaning is finished, continuously cleaning the printing screen for the second time, wherein the screen cleaning time is set to be 3 minutes.
Adjusting the water quality and the water quantity of wastewater flowing from the cleaning tank through an adjusting tank, adding polymeric ferric sulfate into the screen printing plate cleaning waste liquid of the polymerization reaction tank, wherein the adding quantity is calculated according to 800mg/L, and quickly stirring and mixing for reaction for 4 min. Then, adding sulfuric acid into the acidification reaction tank to control the pH value to be 3-3.5, and fully stirring, mixing and reacting for 8 min. Then, adding sodium hydroxide into the neutralization reaction tank to control the pH value of the neutralization reaction tank to be 6.5-9.0, and fully stirring, mixing and reacting for 4 min. Adding polyacrylamide into the flocculation reaction tank, wherein the dosage is calculated by 6mg/L, and fully stirring, mixing and reacting for 13 min. And finally, in a filter tank, filtering and separating precipitates in the waste liquid through 5 layers of filter screens to obtain the treated waste liquid.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent should be subject to the appended claims.
Claims (10)
1. A cleaning method of a printing screen for a circuit board is characterized by comprising the following steps:
adding sodium carbonate into water, and carrying out heating and stirring operation to obtain a printing screen cleaning solution;
adjusting the liquid temperature of the cleaning liquid of the printing screen to 28-32 ℃ to obtain a washing liquid of the printing screen;
pressurizing the washing liquid of the printing screen and spraying the washing liquid of the printing screen by adopting a nozzle;
setting a first cleaning path of a printing screen for a circuit board, wherein the cleaning path comprises a plurality of transverse cleaning paths and a plurality of longitudinal cleaning paths, the transverse cleaning paths are the same as the length direction of the printing screen for the circuit board, and the longitudinal cleaning paths are the same as the width direction of the printing screen for the circuit board;
the first motion path of the nozzle comprises a plurality of cross motion paths, and each cross motion path comprises the sum of a transverse cleaning path and a longitudinal cleaning path so as to perform the first cleaning operation on the printing screen plate for the circuit board;
setting a secondary cleaning path of the printing screen for the circuit board according to the printing pattern of the printing screen for the circuit board and the corner area of the printing screen for the circuit board;
The secondary motion path of the nozzle is the same as the secondary cleaning path of the printing screen plate for the circuit board so as to carry out secondary cleaning operation on the printing screen plate for the circuit board;
before the step of performing the secondary cleaning operation, performing wetting operation on the printing screen by using an organic solvent;
wherein the included angle between the spraying direction of the washing liquid and the printing screen ranges from 27 degrees to 80 degrees.
2. The method of cleaning a printing screen for circuit boards as set forth in claim 1, wherein the heating temperature in the heating and stirring operation is 20 ℃ to 25 ℃.
3. The method for cleaning a printing screen for a circuit board of claim 1, wherein the stirring speed in the heating and stirring operation is 400 to 800 r/min.
4. The method for cleaning a printing screen for a circuit board according to claim 1, wherein the stirring time in the heating and stirring operation is 8 to 12 minutes.
5. The method for cleaning a printing screen for a circuit board according to claim 1, wherein the mass concentration of the sodium carbonate in the cleaning solution for the printing screen is 1.0% to 1.4%.
6. The method of cleaning a printing screen for circuit board as set forth in claim 1, wherein the pressure of the washing liquid for printing screen is 1kg/cm 2～4kg/cm2。
7. The method for cleaning a printing screen for a circuit board of claim 1, wherein the time of the first cleaning operation is 3 to 5 minutes.
8. The method of cleaning a printing screen for circuit boards as set forth in claim 1, wherein the time of the secondary cleaning operation is 2 to 4 minutes.
9. The method of cleaning a printing screen for circuit boards as set forth in any one of claims 1 to 8, wherein after the second cleaning operation is performed on the printing screen for circuit boards, the printing screen for circuit boards is put into the printing screen cleaning solution to perform a soaking operation.
10. The method for cleaning a printing screen for a circuit board of claim 9, wherein the soaking operation is performed for 6 to 8 minutes.
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| CN113498270B (en) * | 2021-07-08 | 2023-06-02 | 江西晶弘新材料科技有限责任公司 | Method for stripping solidified ink in aluminum nitride ceramic substrate |
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