Squeegee cleaner for screen printing machine capable of saving cleaning paper and mask cleaning method using the same

Abstract

This invention relates to a scraper cleaner for a screen printing machine that saves cleaning paper and a method for cleaning the photomask using the scraper cleaner. The scraper cleaner for a screen printing machine and the method for cleaning the photomask using the scraper cleaner are as follows: they reduce the amount of cleaning paper required for cleaning; they increase the number of uses and replacement cycles by using a single roll of cleaning paper, thereby reducing the number of replacements per day and reducing costs; they minimize waste generation by reducing usage, thereby preventing environmental pollution; and the increased replacement cycle reduces the workload of staff.

Description

Technical Field

[0001] This invention relates to a scraper cleaner for a screen printing machine that saves cleaning paper and a method for cleaning the photomask using the scraper cleaner. More specifically, it relates to a scraper cleaner for a screen printing machine that saves cleaning paper and a method for cleaning the photomask using the scraper cleaner: After the solder printing process of the screen printing machine, the cleaning process of paper rolls used in the photomask cleaning operation to remove solder residue on the photomask can be significantly reduced. One paper roll can be used for a day's photomask cleaning operation, thereby reducing the number of paper roll changes and greatly shortening downtime, thus alleviating the economic burden caused by using expensive paper rolls, reducing the generation of paper roll waste, achieving carbon reduction by preventing environmental pollution, reducing the overall process time, i.e., tack time, thereby improving productivity, and improving the workload of workers by reducing the paper roll changeover process. Prior Technology

[0002] Typically, to mount electronic components on a printed circuit board (PCB), a screen printing process is required to apply solder paste to the surface of the substrate. The screen printing process involves applying solder paste while a photomask with openings at predetermined locations is in close contact with the substrate surface, selectively applying the solder paste to positions on the substrate surface corresponding to the openings. In this screen printing process, the surface of the photomask in close contact with the PCB substrate may become locally contaminated with solder paste due to repeated screen printing operations.

[0003] If the surface of the photomask in contact with the substrate is contaminated with solder paste, the precision of the screen printing operation will decrease, and the likelihood of producing defective products will increase. This is because the thickness of the solder paste adhering to the photomask surface reduces the adhesion between the photomask and the substrate, thus making it impossible to properly apply the solder paste to the correct position on the substrate surface.

[0004] To prevent contamination of the photomask, a photomask cleaning device is installed in the apparatus for performing screen printing operations. The photomask cleaning device can be configured in various forms; typically, cleaning paper wound on a roller is pressed tightly against the photomask surface to perform the cleaning action. The photomask cleaning device is activated to clean the photomask surface during repeated screen printing operations by temporarily stopping the printing process.

[0005] Regarding the photomask cleaning process described above, three representative types of cleaning devices are presented: a cleaning device that sprays cleaning fluid and generates ultrasound, a roller brush, and a paper roll. While the process of spraying cleaning fluid and cleaning the photomask with ultrasound easily removes impurities, it suffers from increased equipment costs and space constraints due to the large scale of the overall equipment. Furthermore, the need for regular cleaning fluid replacement or post-treatment of the cleaning fluid further increases equipment requirements and financial burden.

[0006] Secondly, the roller brush is a method of removing impurities by applying cleaning liquid to the photomask surface. However, this method has the following problems: the cleaning liquid residue after drying can easily lead to unqualified photomask cleaning, and because the surface is repeatedly swept by the roller brush, the photomask surface is damaged, resulting in unqualified products.

[0007] Third, a recently disclosed and used device is a paper roll device, which is configured such that a paper roll coated with cleaning liquid is wound around a roller. As the paper roll is released from the roller, it comes into contact with the surface of the photomask, thereby adsorbing and removing foreign matter adhering to the photomask surface. It can easily and quickly remove solder, and can quickly clean and dry the photomask. Since it does not use cleaning liquid directly, it is more economical because it does not require cleaning liquid discharge facilities. Moreover, its method is to adsorb residual solder on the photomask surface by contacting it, rather than sweeping it away from the photomask surface like a roller brush. Therefore, it will not cause damage to the photomask and will not leave cleaning liquid residue. It is currently the most widely used device.

[0008] However, although the paper roll improves upon the shortcomings of cleaning by spraying cleaning fluid or cleaning by roller brush, the following problems still exist.

[0009] First, there are the following problems: setting up paper rolls is very difficult and requires skilled technicians, leading to increased labor costs. Second, there are the following problems: changing paper rolls requires stopping the entire process, and even skilled technicians need a considerable amount of time to perform the changeover, resulting in reduced production efficiency due to increased downtime. Specifically, after cleaning the paper rolls, they typically need to be changed four to five times or more per day. Each paper roll changeover takes at least 20 minutes, so even based on four to five changes per day, there are 80 to 100 minutes of downtime, significantly reducing production efficiency.

[0010] Furthermore, while cleaning the photomask with paper has the advantage of rapid drying, even when the cleaning solution applied to the paper is used to melt the solder and remove residual solder, cleaning solution often remains on the photomask surface. However, there is no separate device for removing this residual cleaning solution; relying solely on paper for removal leads to the problem of cleaning solution residue due to rapid drying, resulting in photomask contamination.

[0011] Therefore, the following problems exist: The increased downtime during paper roll changes leads to reduced productivity and hinders mass production. Furthermore, unskilled technicians struggle to quickly assemble paper rolls, increasing labor costs and causing photomask contamination due to residual cleaning solution.

[0012] Referring to the current domestic and international situation regarding paper rolls as described above, the following is an overview. First, the main places where paper rolls are still in use until recently can be listed as: factories (SMT, Surface Mount Technology), which employs surface mount technology including screen printing processes; and factories (OSAT, Outsourced Semiconductor Assembly and Test), which, after productizing wafer wafers into semiconductor wafers and packaging them in a way suitable for substrates, carry out subsequent processes after wafer testing, packaging testing, and module testing to produce finished products.

[0013] Firstly, the cleaning quality of the paper rolls used in the SMT and OSAT factories mentioned above has been satisfactory so far. Currently, the paper rolls are typically 15m long and can be used approximately 110 times (based on PCB units). Each cleaning cycle uses 135mm of paper. This is because when the cleaning solution simply soaks the paper, the removal of residual solder from the photomask surface using a single blade only extends the paper's usable length. Since photomask cleaning is performed solely with paper, the usable length will increase further, but cannot be reduced.

[0014] Therefore, based on the overall length specifications and single-use length of the paper roll as described above, a 15m paper roll is used approximately 5 times per day in an SMT factory and 60 times per day in an OSAT factory.

[0015] That is, when referring to the number of times the paper roll is replaced, the conventional scraper cleaner using the paper roll is replaced and used 5 to 60 times to clean the photomask. These paper rolls are replaced while the machine is stopped, so they account for a considerable proportion of the production time.

[0016] Therefore, in order to minimize such downtime, using conventional paper rolls and reducing the length of paper used for cleaning the photomask reduces the number of changes per day, which has an obvious effect on improving production efficiency and shortening production time.

[0017] However, to date, no scraper cleaning device has been developed that can significantly reduce the number of paper rolls used. SMT and OSAT plants need a scraper cleaning device that can significantly increase the number of times a paper roll can be used and reduce the number of replacements, so that only one paper roll is needed for cleaning during a day's operation.

[0018] Knowledge of technical documents Patent documents Patent Document 1: Korean Patent Registration No. 10-0693177, Registration Date: March 5, 2007 Patent Document 2: Korean Patent Registration No. 10-1403081, Registration Date: May 27, 2014 Summary of the Invention

[0019] [The problem the invention aims to solve] Therefore, the present invention is proposed to solve the problems described above, and its object is to provide a brush cleaner for screen printing presses that can save cleaning paper and a photomask cleaning method using the brush cleaner: which can significantly reduce the length of cleaning paper used in one cleaning, thereby achieving high economic advantages and saving effect.

[0020] Another object of the present invention is to provide a scraper cleaner for a screen printing machine and a photomask cleaning method using the scraper cleaner: by reducing the length used in one cleaning cycle when cleaning the cleaning paper, the downtime caused by the replacement time of the cleaning paper for a day is minimized, thereby reducing cycle time, increasing overall production process efficiency, and shortening production time.

[0021] Furthermore, the present invention aims to provide a scraper cleaner for a screen printing press that saves cleaning paper and a photomask cleaning method using the scraper cleaner: the amount of paper rolls used is significantly reduced, minimizing the generation of waste caused by paper roll use, thereby directly or indirectly preventing environmental pollution, thus achieving carbon reduction operation to reduce carbon emissions, and by reducing the number of paper roll replacements, reducing the replacement process associated with paper roll replacement, thereby improving the workload of staff. [Methods used to solve problems]

[0022] To achieve the aforementioned objective, the scraper cleaner for a screen printing press according to the present invention, which saves cleaning paper, is characterized by comprising: a base 100, elongated along the left-right length direction, with sliding holes 102 symmetrically formed on both sides for vertical penetration, and moved to the photomask side and moving back and forth along the front of the photomask; a paper control mechanism 200, formed in a direction orthogonal to the left-right length direction of the base 100, for winding cleaning paper P, releasing, winding, and rotating in the opposite direction in a direction orthogonal to the left-right length direction of the base for cleaning the photomask, thereby maintaining the supply, recycling, and cleanliness of the cleaning paper; and a scraper cleaning mechanism 300, which, when the cleaning paper is supplied by the paper control mechanism 200... When the cleaning zone is reached, the cleaning paper used to remove residual solder from the photomask rises vertically. The paper control mechanism 200 rotates in the opposite direction to achieve a flat cleaning state for the cleaning paper in the cleaning zone. The cleaning paper is also raised and lowered on the upper surface of the base 100 so that the cleaning paper in the cleaning zone with a flat surface approaches and contacts the photomask to clean it. The cleaning liquid spraying mechanism 400 is provided on one side of the scraping cleaning mechanism 300 that supplies the cleaning paper P before the cleaning operation. It has multiple nozzles 402 for spraying cleaning liquid for cleaning the photomask onto the cleaning paper P supplied to the cleaning position, thereby coating the cleaning paper with cleaning liquid before the cleaning operation and wetting the cleaning paper.

[0023] Here, the paper control mechanism 200 is characterized by comprising: a support roller 210, which is formed elongated along the left-right length direction and is wound into a roller shape on one side of the base for cleaning paper P before cleaning; a receiving roller 220, which is formed elongated along the left-right length direction and is wound into a roller shape on the other side of the base for cleaning paper P after cleaning; a forward rotation adjustment motor 230, which is coupled to and driven on one axial side of the receiving roller, so that the cleaning paper P supplied from the support roller 210 is released and wound onto the receiving roller 220 for cleaning; and a reverse rotation adjustment motor 240, which is coupled to one axial side of the support roller 210, so that the cleaning paper P only contacts the photomask with the section used for cleaning the photomask. In order to avoid the section of the cleaning paper P not used for cleaning being contaminated by solder residue on the photomask, the cleaning paper in the cleaning section is lifted by the scraping cleaning mechanism 300, and the cleaning paper wound on the support roller side is temporarily released to stretch it. The stretching cleaning paper P section used for cleaning the photomask is formed into a flat surface by reverse rotation.

[0024] On the other hand, the scraper cleaning mechanism 300 is characterized by including: at least two scraper blades 310, formed with a length corresponding to the left and right width of the cleaning paper P before the cleaning operation supplied from the paper control mechanism 200 in its unfolded state; a scraper plate 320, formed with a length corresponding to the left and right length direction of the scraper blades 310, and made of silicon, for wiping away cleaning fluid and solder residue remaining on the photomask in the cleaning fluid transmitted from the cleaning paper P; a top vacuum housing 330, formed elongated along the left and right length direction, with a scraper-brush coupling portion 332 protruding on its upper surface with a length corresponding to the left and right width of the cleaning paper, thereby enabling replacement of the scraper blades 310 and the scraper plate 320, and for coupling with the... Multiple vacuum holes 334 are formed between the scraper blade 310 and the scraper plate 320 of the scraper joint 332, so that residual solder on the photomask can be absorbed and removed by cleaning paper; the bottom vacuum housing 340 is formed to the same length as the top vacuum housing 330 and is connected to the top vacuum housing in a vertically penetrating manner so that the vacuum suction hole 342 communicating with the vacuum holes 334 can be vacuumed by the operation of an external compressor; and the push cylinder 350 is symmetrically formed on the upper surface of the base 100, and the upper end of the push rod 352 is engaged with the lower surface of the bottom vacuum housing 340, so that the bottom vacuum housing 340 can be raised and lowered according to the raising and lowering of the push rod 352.

[0025] Here, the invention is characterized by the formation of a piston rod horizontal adjustment section 360, which adjusts the rising height of the push rod 352 of the push cylinder 350, thereby controlling the rising height of the cleaning paper of the scraping cleaning mechanism 300 by adjusting the vertical spacing of the bottom vacuum housing 340, so that the contact position of the cleaning paper for removing residual solder from the photomask corresponds to that of the photomask. The piston rod horizontal adjustment section 360 includes: a horizontal shaft 362, the upper end of which is fixedly coupled to the bottom vacuum housing 340. The lower surface has a lower end that is inserted into and engaged with the sliding hole 102 of the base 100 in such a way that it moves up and down along the sliding hole 102 of the base 100, and protrudes towards the lower surface of the base; and a horizontal adjusting ring 364, which has a sliding hole 366 formed in the center so as to move up and down along the lower outer periphery of the horizontal axis 362 protruding towards the lower surface of the base, and has a stop bolt hole 368 formed in orthogonal communication with the sliding hole 366 so as to fix the horizontal adjusting ring 364 in the position of moving up and down along the outer periphery of the horizontal axis.

[0026] Furthermore, preferably, a guide roller 370 is also formed, which is combined with the paper supply side of the paper control mechanism of the scraping cleaning mechanism 300 in a free-rotating manner at both ends, and guides the cleaning paper P to the scraper 320 side of the scraping cleaning mechanism 300 in an unfolded state.

[0027] Here, the feature is that at least two or more scrapers 310 are formed within 5.0 mm, and the cleaning paper P used between the scrapers 310 for removing residual solder from the photomask moves in stages in 2.5 mm increments as driven by the forward rotation adjustment motor 230.

[0028] On the other hand, a feature is that a counting mechanism 500 is also formed on the upper surface of the base 100 between the scraping cleaning mechanism 300 and the paper control mechanism's cleaning paper discharge side. This counting mechanism 500 measures the length of the cleaning paper used. The counting mechanism 500 includes: a guide gear roller 510, with radially arranged guide gears extending along the left-right length direction to guide and discharge the cleaning paper P to be discharged after cleaning at certain intervals; a shaft block 520, axially connecting the left and right ends of the guide gear roller 510 in a way that allows it to rotate freely; and a counting rotating member 530, which is connected to the guide gear roller 510. The counting rotating member 530 is connected to the outer side of any one side of the shaft block 520 of the 10, and has radial counting wings 532 so as to rotate with the rotation of the guide gear roller 510 to determine the discharge length of the cleaning paper; the counting sensor 540 is connected to the shaft block directly below the counting wings so as to determine the number of counting wings 532 by the rotation of the counting wings of the counting rotating member 530, thereby determining the length of use of the cleaning paper; and the control unit determines the length of use of the cleaning paper by the measurement value of the counting sensor 540, thereby controlling the time of changing the cleaning paper roll.

[0029] Here, a feature is that a detection sensor 600 is also formed, which detects the release of cleaning paper from the side of the paper control mechanism 200 that supplies cleaning paper P to the center of the base 100 before the paper control mechanism 200 performs a cleaning operation. The detection sensor 600 continuously detects the supplied cleaning paper, and when the last cleaning paper supply is completed and the cleaning paper detection signal is cut off, it compares and calculates with the length of the cleaning paper sent from the counting sensor 540, thereby generating a cleaning replacement signal from the control unit.

[0030] On the other hand, the photomask cleaning method of the screen printing press using a scraper cleaner that can save cleaning paper according to the present invention is characterized by repeatedly performing the following steps to clean the photomask: a cleaning paper setting step S100, in which cleaning paper P before cleaning is wound around the support roller 210 of the paper control mechanism 200 formed in front and behind the base 100, the front end of the cleaning paper P wound on the support roller is released, and the cleaning paper P is wound onto the receiving roller 220 after passing through the guide roller 370, the cleaning liquid spraying mechanism 400, the scraper blade 310 of the scraper cleaning mechanism 300, and the guide gear roller 510 of the counting mechanism 500, thereby cleaning the photomask, wherein the scraper cleaning mechanism 300 has at least two or more scraper blades 32 0. Vacuum hole 334; Photomask cleaning preparation first step S200, in this step S200, the cleaning liquid spraying mechanism 400, which is located between the scraper cleaning mechanism 300 and the support roller 210, sprays the cleaning liquid for cleaning the photomask onto the cleaning paper P set in the scraper cleaner in the above-mentioned cleaning paper setting step. The receiving roller 220 is rotated by the drive of the forward rotation adjustment motor 230, so that the scraper cleaner including the base moves towards the photomask to be cleaned. At this time, the cleaning paper coated with cleaning liquid is located on the upper side of the scraper blade 310 and scraper plate 320 of the scraper cleaning mechanism 300; Photomask cleaning preparation second step S300, in this step S300, the cleaning liquid spraying mechanism 400, which is located between the scraper cleaning mechanism 300 and the support roller 210, sprays the cleaning liquid for cleaning the photomask onto the cleaning paper P set in the above-mentioned cleaning paper setting step S200. The cleaning paper P coated with cleaning solution is moved to the side of the photomask to be cleaned by the scraper cleaner. The scraper cleaning mechanism 300 is located on the upper side. The push rod 352 of the push cylinder 350, which is adjusted to the contact mask height according to the piston rod horizontal adjustment part 360, works, so that it rises vertically together with the cleaning paper P. The cleaning paper is released at the support roller 210 at a height corresponding to the vertical movement of the scraper cleaning mechanism 300. In the third step S400 of photomask cleaning preparation, by means of the above-mentioned second step of photomask cleaning preparation, the scraper cleaning mechanism 300 rises to the photomask side. The cleaning paper P released from the support roller 210 is driven by the reverse rotation adjustment motor 240 and the support roller 210 rotates in the opposite direction to lift the cleaning paper P. The released cleaning paper P is recycled to the support roller side, and the cleaning paper returns to the position of the scraper 310 in the first step of photomask cleaning preparation, maintaining flat tension so that the cleaning paper is in uniform contact with the photomask surface; in the photomask cleaning step S500, after the photomask cleaning preparation is completed by the above-mentioned third step of photomask cleaning preparation, the cleaning paper contacts the photomask, thereby the entire scraper cleaner moves towards the cleaning paper setting step side. During the movement, the first cleaning is performed by removing the cleaning liquid adhering to the photomask surface by the scraper 320, the second cleaning is performed by adsorbing and removing residual solder by the vacuum hole 334, and the third cleaning is performed by completely removing the residual solder on the final photomask by the scraper 310;And in the scraper cleaner return setting step S600, after the photomask cleaning step is completed, the scraper cleaner returns to the cleaning paper setting step position, and the forward rotation adjustment motor 230 is driven so that the cleaning paper P is wound around the receiving roller 220 at a distance equivalent to half the distance between the two scraper blades 310.

[0031] Here, the feature is that the scraper 310 forms at least two or more within a range of 5.0 mm, and the cleaning paper P moving between the scrapers moves in stages in 2.5 mm increments by means of the scraper cleaner returning to the setting step. [Invention Benefits]

[0032] The present invention has the following advantages: by significantly reducing the length of the cleaning paper used in a single cleaning cycle, it can improve economic efficiency and save on the amount of cleaning paper used. At the same time, by shortening the length of the cleaning paper used in a single cleaning cycle when cleaning the photomask, it can minimize the downtime caused by the daily cleaning paper roll replacement time, thereby shortening the cycle time, improving the efficiency of the overall production process and shortening the production time.

[0033] On the other hand, the present invention also has the following effects: it can significantly reduce the amount of cleaning paper used and minimize the waste generated by using paper rolls, thereby directly or indirectly preventing environmental pollution, thus achieving carbon reduction operation to reduce carbon emissions, and by reducing the number of paper roll replacements, reducing the replacement process that accompanies paper roll replacement, thereby improving the workload of staff. Simple Explanation of the Diagram

[0034] Figure 1 is an overall perspective view of the receiving roller side of the scraper cleaner of a screen printing press that can save cleaning paper according to the present invention.

[0035] Figure 2 is an overall perspective view of the support roller side of the scraper cleaner of the screen printing press according to the present invention, which can save cleaning paper.

[0036] Figure 3 is an exploded perspective view of a scraper cleaner for a screen printing press according to the present invention, which can save cleaning paper.

[0037] Figure 4 is a side cross-sectional view of a scraper cleaner for a screen printing press according to the present invention, which can save cleaning paper.

[0038] Figure 5 is a block diagram of a photomask cleaning method using a scraper cleaner for a screen printing press according to the present invention, which can save cleaning paper.

[0039] Figures 6 to 9 are side views of the working state of each step of the photomask cleaning method using a scraper cleaner for a screen printing press that saves cleaning paper according to the present invention. Implementation

[0040] Hereinafter, with reference to the accompanying drawings, the technical features of a scraper cleaner for a screen printing press that can save cleaning paper according to the present invention and a photomask cleaning method using the scraper cleaner will be specifically described based on an embodiment.

[0041] The scraper cleaner for screen printing machines according to the present invention, which saves cleaning paper, has high economic benefits and cost-saving effects by significantly reducing the length of cleaning paper used in a single cleaning cycle. By shortening the length of cleaning paper required for a single cleaning cycle, downtime caused by the daily replacement time of cleaning paper rolls can be minimized, thereby shortening cycle time. This not only improves the efficiency of the overall production process and shortens production time, but also significantly reduces the amount of cleaning paper used, thereby minimizing waste generated from the use of paper rolls and directly or indirectly preventing environmental pollution. This enables carbon reduction operation, reducing carbon emissions. Furthermore, by reducing the number of paper roll replacements, the replacement process caused by paper roll replacement is reduced, thereby improving the workload of workers. As shown in Figures 1 to 4, the scraper cleaner consists of a base 100, a paper control mechanism 200, a scraper cleaning mechanism 300, and a cleaning liquid spraying mechanism 400.

[0042] The base 100 is configured such that the paper control mechanism 200, the scraper cleaning mechanism 300, and the cleaning liquid spraying mechanism 400 (described later) can function as a scraper cleaner. The base 100 is elongated along its left-right length, and sliding holes 102 that pass through vertically are formed symmetrically on both sides. The base can be moved to the photomask side and then moved back and forth along the front of the photomask. That is, the base 100 can be moved to the photomask side by a transmission mechanism (not shown) that can move back and forth, such as a guide rail, a transmission screw, or a cylinder, for photomask cleaning.

[0043] The paper control mechanism 200, while winding the cleaning paper, conveys it to the scraper cleaning mechanism 300 (described later) for cleaning. By adjusting the tension, the cleaning area is formed into a flat surface to clean the photomask. The paper control mechanism 200 is formed in a direction orthogonal to the left-right length direction of the base 100, allowing the cleaning paper P to be wound. For cleaning the photomask, it releases, winds, and rotates in the opposite direction orthogonal to the left-right length direction of the base, thereby maintaining the supply, recovery, and cleanliness of the cleaning paper. Specifically, the release of the paper control mechanism 200 is to supply the cleaning paper P before cleaning the photomask to the scraper cleaning mechanism 300; the winding is to recover the cleaning paper P after cleaning the photomask; and the reverse rotation is as follows: to prevent damage or breakage of the cleaning paper P when it approaches the photomask side via the scraper cleaning mechanism 300, the tension of the stretched cleaning paper P is adjusted so that it contacts the photomask cleaning area in a flat state.

[0044] As shown in Figures 1 to 4, the paper control mechanism 200 consists of a support roller 210, a receiving roller 220, a forward rotation adjustment motor 230, and a reverse rotation adjustment motor 240.

[0045] As mentioned above, the support roller 210 is configured to supply the cleaning paper P to the scraping cleaning mechanism, and release the cleaning paper P during the upward process in order to contact the photomask surface. In order for the cleaning paper P surface in contact with the photomask surface to make uniform contact with the photomask, a reverse rotation operation is performed, thereby forming a flat surface. The support roller 210 is formed long in the left-right length direction, and the cleaning paper P before cleaning is wound in the shape of a roller around one side of the base.

[0046] Here, in order to shorten the replacement time of the cleaning paper, the support roller 210 and the receiving roller 220 described later are formed in the form of a box. The box is configured such that the cleaning paper P is wound around a unit shape of the support roller 210, and the receiving roller 220 is also preferably configured in the form of a box, so that the cleaning paper P that has been cleaned can be recycled and the receiving roller 220 and the cleaning paper P can be replaced simultaneously in the wound state.

[0047] The receiving roller 220 collects the cleaning paper supplied by the support roller 210, which has been used to clean the photomask by the scraping cleaning mechanism. The receiving roller 220 is formed elongated in the left-right length direction, and the cleaning paper P after cleaning is wound in a roller shape on the other side of the base. Here, the receiving roller 220 plays the role of collecting the cleaning paper P used to clean the photomask, and also plays the role of maintaining tension through interaction with the counter-rotating support roller, so that the cleaning paper located in the cleaning area of ​​the scraping cleaning mechanism during the photomask cleaning process forms a flat surface.

[0048] For photomask cleaning, the aforementioned forward rotation adjustment motor 230 supplies cleaning paper P with the uncleaned side of the cleaning paper P positioned in the cleaning area. The forward rotation adjustment motor 230 is configured to be coupled to one axial side of the receiving roller, so that the cleaning paper P supplied from the support roller 210 is released and wound onto the receiving roller 220 for cleaning. That is, the forward rotation adjustment motor 230 transmits driving force to rotate the receiving roller, and the support roller, which is linked to the cleaning paper, rotates with the rotation of the receiving roller, releasing the cleaning paper required for cleaning and supplying it to the cleaning position of the scraping cleaning mechanism.

[0049] The aforementioned reverse rotation adjustment motor 240 is provided to improve cleaning efficiency. The reverse rotation adjustment motor 240 recycles the supplied cleaning paper back to the support roller side and forms a flat surface on the cleaning paper. By adjusting the tension, it prevents uneven contact between the cleaning surface of the cleaning paper and the photomask surface. The reverse rotation adjustment motor 240 is coupled to one axial side of the support roller 210 so that the cleaning paper P only contacts the photomask with the section used for cleaning the photomask. In order to avoid the section of the cleaning paper P not used for cleaning being contaminated by solder residue on the photomask, the cleaning paper in the cleaning section is lifted by the scraping cleaning mechanism 300, and the cleaning paper wound on the support roller side is temporarily released to stretch it. By reverse rotation, the section of the elongated cleaning paper P used for cleaning the photomask is formed into a flat surface.

[0050] That is, as described above, the reverse rotation adjustment motor 240 supplies cleaning paper to the scraper cleaning mechanism 300 for cleaning. The supply of cleaning paper is driven by the aforementioned forward rotation adjustment motor 230, and the receiving roller 220 rotates according to the drive of the forward rotation adjustment motor. As the receiving roller 220 rotates, the cleaning paper wound on the support roller 210 is released, thereby causing the support roller to rotate as well.

[0051] Subsequently, as described above, the cleaning paper P released from the support roller 210 is supplied to the cleaning position of the scraper and scraper plate provided with the scraper cleaning mechanism 300, as shown in Figures 4 and 6. Next, the scraper cleaning mechanism is raised to the upper side of the base by the push cylinder described later. As the scraper cleaning mechanism rises, the cleaning paper P at the cleaning position moves upward as shown in Figure 7, with its position fixed to a certain extent, due to the frictional force based on the linear contact between the scraper and the cleaning paper and the linear frictional force with the scraper plate formed of silicon.

[0052] At this time, according to the moving distance of the upward-moving scraper cleaning mechanism, the cleaning paper wound on the support roller 210 is also released and moves upward accordingly. This not only prevents the cleaning paper from tearing or being damaged, but also prevents deformation of the tissue density of the cleaning surface that constitutes the cleaning paper, thereby maintaining cleaning efficiency.

[0053] Subsequently, the cleaning paper released by the upward movement of the scraper cleaning mechanism 300 is in a flexible, planar shape. Therefore, after moving upward, the cleaning surface of the cleaning paper located on the scraper blade and the scraper plate will also be released and stretched due to the stretched cleaning paper. As a result, the contact between the scraper blade and the scraper plate will also become suspended due to the stretching of the cleaning paper. This will lead to poor contact of the cleaning paper used to clean the photomask. Consequently, during the cleaning process, the cleaning paper will be deformed or pushed relative to the direction of the scraper cleaning device that is moving for cleaning, resulting in reduced cleaning efficiency and excessive use of cleaning paper.

[0054] Therefore, by adjusting the rotation of the motor connected to one side shaft of the support roller 210, the support roller 210 rotates in the opposite direction. This causes the cleaning paper released during the upward movement of the scraper cleaning mechanism 300 to be recycled back to the support roller 210. This ensures that only the amount of cleaning paper required for cleaning is used, avoiding unnecessary use. Furthermore, the cleaning paper released due to the rising height of the scraper cleaning mechanism maintains a flat tension, preventing the released cleaning paper from suspending with the scraper blade and squeegee. This prevents poor contact with the photomask cleaning surface, thereby improving cleaning efficiency. In other words, the photomask can be cleaned by the scraper blade contacting a smaller area of ​​cleaning paper, and the supply of unnecessary cleaning paper for photomask cleaning can be limited, thus reducing the amount of cleaning paper used.

[0055] As described above, the scraping cleaning mechanism 300 actually cleans by bringing the cleaning paper into contact with the photomask. The scraping cleaning mechanism 300 is configured to rise and fall on the upper surface of the base 100. When the cleaning paper is supplied to the cleaning zone by the paper control mechanism 200, which is based on the support roller and the receiving roller for supplying, retrieving and reversing the paper to set the cleaning surface, the cleaning paper used to remove residual solder from the photomask rises vertically. By the reverse rotation of the paper control mechanism 200, the cleaning paper in the cleaning zone is made to have a flat surface. The cleaning paper in the cleaning zone with a flat surface moves close to and contacts the photomask and moves along the photomask surface to perform cleaning.

[0056] As shown in Figures 3 and 4, the above-mentioned scraper cleaning mechanism 300 consists of at least two scraper blades 310, a scraper plate 320, a top vacuum housing 330, a bottom vacuum housing 340, and a push cylinder 350.

[0057] At least two or more of the aforementioned scraper blades 310 function as follows: the cleaning paper P is positioned flat between the blades, scraping away residual solder activated by the cleaning liquid on the surface and wiping it off with the cleaning paper. The scraper cleaning mechanism 300 is configured with a length corresponding to the left and right width of the cleaning paper P in its unfolded state before cleaning, supplied from the paper control mechanism 200. That is, typically, the length of the scraper blades 310 preferably corresponds to the width of the photomask.

[0058] Here, as shown in Figure 4, at least two scraper blades 310 are formed within a 5.0 mm range. The cleaning paper P used to remove residual solder from the photomask between the scraper blades 310 moves in stages in 2.5 mm increments according to the drive of the forward rotation adjustment motor 230. The reason for limiting to the above specifications is as follows. First, when photomask cleaning is taken as the reference, in the photomask cleaning process, the two scraper blades of the present invention are arranged within a 5.0 mm range. When cleaning paper is supplied for cleaning, the surface of residual solder on the photomask surface is activated by the cleaning liquid, and the entire scraper cleaner, including the base, moves along the photomask surface.

[0059] During the movement, as the first process, to wipe away residual solder and cleaning fluid from the surface of the activated photomask, the scraper 320 holds the cleaning paper P and wipes away the cleaning fluid from the photomask surface. The wiped-off cleaning fluid is sucked in and processed through the vacuum hole between the scraper and the scraper. At the same time, as the second process, residual solder is sucked in and removed through the vacuum hole by the cleaning paper.

[0060] Next, as a third process, the scraper on the vacuum hole side of the scraper wipes away residual solder from the photomask surface by scraping, while the scraper on the receiving roller side removes the solder residue removed by the scraper on the vacuum hole side using cleaning paper. Here, the cleaning paper on the scraper located at the rear end of the scraper on the vacuum hole side has the highest cleaning contamination rate for residual solder, so it is wound onto the receiving roller side after cleaning.

[0061] In other words, considering the degree of cleaning contamination of the cleaning paper in each step, the cleaning liquid removed from the photomask at the scraper exhibits a degree of cleaning contamination that allows the cleaning liquid to be recycled back to the cleaning paper. Therefore, it can be used in the cleaning step of the scraper. Only solder residue is sucked in at the vacuum hole, that is, the solder residue sucked in through the micropores of the cleaning paper is sucked in and discharged. Therefore, the degree of cleaning contamination of the cleaning paper is low.

[0062] However, during the process of scraping off the activated residual solder on the surface and wiping it off with cleaning paper, the cleaning contamination level of the scraper located at the front end of the vacuum hole side is lower than that of the rear scraper. Therefore, the cleaning paper on the front end of the scraper can be reused from the rear end scraper in stages of about 2.5mm.

[0063] That is, since the cleaning paper can be used repeatedly at 2.5mm intervals within a 5.0mm distance between the squeegees, the photomask can be cleaned by moving a distance equivalent to half the distance between the squeegees each time.

[0064] Based on the above characteristics, the number of uses and distance of use of conventional scraper cleaners and scraper cleaners according to the present invention are observed, as shown in Table 1 below.

[0065] [Table 1] project Commonly known scraper cleaner This invention Scraper cleaner result Cleaning results satisfy satisfy satisfy Paper used 10 times (15m reference) 1,350mm 20mm (135mm / time) 260mm 20mm (26mm / time) Reduce by 80%, Compared to Use of familiar knowledge 1 / 5 Paper 15m can be used a number of times 110 times (PCB Unit) 570 times (PCB Unit) Reduce 80 Compared to the commonly used 1 / 5 Number of paper replacements 5 times / 1 day (SMT factory) 1 time / 1 day (SMT factory) 4 times / day reduction 60 times / 1 day (OSAT factory) 12 times / 1 day (OSAT factory) 48 times / day decrease Productivity improvement (First production line, screen printing machine standard) - Compared to conventional wisdom, it reduces replacement time by 80%. - Compared to conventional wisdom, it reduces replacement time by 80%.

[0066] As shown in Table 1 above, compared with conventional scraper cleaners, the scraper cleaner of the present invention can reduce the amount of cleaning paper used, the number of replacements, and the replacement time by about 80%.

[0067] Based on this, compared with conventional scraper cleaners, the scraper cleaner of the present invention can reduce the cost of cleaning paper by 80%, reduce the workload of staff by significantly reducing the number of replacements, and reduce the amount of paper waste, such as lead, which must be treated as special waste, thereby reducing the processing cost and minimizing the emission of environmental pollution sources.

[0068] On the other hand, as briefly mentioned above, the scraper 320 acts as a cleaning blade to remove residual cleaning fluid and solder residue from the photomask. The scraper is formed in a manner corresponding to the left-right length direction of the scraper blade 310 and is made of silicon, so that residual photomask cleaning fluid and solder residue can be wiped away by the cleaning paper P. That is, the scraper 320 functions similarly to the silicon attached to a windshield wiper that swings left and right to remove rainwater or foreign objects adhering to a car's windshield during rain. Taking a car as an example, it functions as follows: to remove foreign objects from the windshield, a windshield wiper with a wiper blade made of silicon or rubber pads swings left and right, thereby wiping away rainwater by the wiper blade, or removing windshield cleaning fluid and foreign objects by spraying glass cleaner to activate the surface of the foreign object. The scraper can remove residual cleaning fluid and solder residue from the photomask, thus keeping the photomask surface cleaner.

[0069] As shown in Figures 3 and 4, the aforementioned scraper 310 and scraper 320 are provided on the upper surface of the top vacuum housing 330 for absorbing and removing solder residue or cleaning fluid washed off during the cleaning process by the cleaning paper, and are configured to be able to combine with the bottom vacuum housing 340 described later to maintain the internal vacuum.

[0070] As described above, the top vacuum housing 330 is formed elongated along its left-right length direction. A scraper-brush coupling portion 332 is formed on its upper surface. This coupling portion 332 protrudes with a length corresponding to the left-right width of the cleaning paper, facilitating the replacement of the scraper blade 310 and scraper plate 320. Furthermore, a plurality of vacuum holes 334 are formed through the space between the scraper blade 310 and scraper plate 320 that engage with the scraper-brush coupling portion 332, allowing residual solder from the photomask to be adsorbed onto the cleaning paper and removed. Here, the vacuum holes 334 can also adsorb and remove solder residue and cleaning fluid scraped out by the scraper plate.

[0071] In addition, the top vacuum housing 330 is connected to the upper part of the opening of the bottom vacuum housing 340 described later. The connection between the bottom vacuum housing 340 and the top vacuum housing 330 forms a vacuum suction space, thereby allowing solder to be sucked in through the vacuum hole 334.

[0072] The bottom vacuum housing 340 and the top vacuum housing 330 are combined to form a vacuum that can suck in cleaning paper, residual solder on the photomask, solder residue and cleaning fluid through the vacuum hole 334. The bottom vacuum housing 340 is formed to the same length as the top vacuum housing 330 and is connected to the top vacuum housing in a vertically penetrating manner so that the vacuum suction hole 342, which is connected to the vacuum hole 334, can perform vacuum suction by the operation of an external compressor.

[0073] The function of the aforementioned push cylinder 350 is as follows: In order to make the cleaning paper P contact with the photomask, the bottom vacuum housing 340 of the scraper cleaning mechanism 300 is raised vertically, so that the cleaning paper P on the scraper 310 side of the scraper cleaning mechanism 300 contacts the photomask, so that the surface of the residual solder is activated by the cleaning liquid to make cleaning easier, and the cleaning of the photomask is completed by the vacuum suction of the scraper 310, the scraper 320 and the vacuum hole 334. The push cylinder 350 is formed symmetrically on the upper surface of the base 100, and the upper end of the push rod 352 is combined with the lower surface of the bottom vacuum housing 340, so that the bottom vacuum housing 340 rises and falls with the rise and fall of the push rod 352.

[0074] On the other hand, the vertical rise height of the push rod 352 of the push cylinder 350 is usually fixed, making it difficult to adjust individually in actual operation. Therefore, in order to more effectively control the scraper cleaning mechanism 300 to rise to the height of contact with the photomask, as shown in FIG3, a piston rod horizontal adjustment section 360 is preferably further formed.

[0075] First, in order to move the cleaning paper P to the position where it contacts the photomask, the scraper cleaning mechanism 300 needs to be raised for cleaning. If the vertical rise of the push rod 352 is greater than the contact height with the photomask, the cleaning paper will adhere too tightly to the photomask surface. The resulting pressure will cause the cleaning paper to adhere too tightly to the photomask, thereby increasing the friction and ultimately causing the cleaning paper to tear or be damaged during the cleaning process. In addition, if the scraper 310 comes into direct contact with the photomask surface due to the tearing of the cleaning paper, scratches may be generated on the photomask surface, resulting in damage to the photomask.

[0076] Conversely, if the vertical rise of the push rod 352 is short, the cleaning paper cannot rise to the height required to contact the photomask for cleaning, thus cleaning efficiency cannot be expected. However, as mentioned above, in most cases, the push rod 352 is formed to be longer than the contact height with the photomask, so it is preferable to install a piston rod leveling adjustment part 360 that can control this.

[0077] Therefore, the piston rod horizontal adjustment unit 360 is configured to adjust the rising height of the push rod 352 of the push cylinder 350 by adjusting the vertical spacing of the bottom vacuum housing 340, so that the rising height of the cleaning paper based on the scraper cleaning mechanism 300 is controlled so that the contact position of the cleaning paper for removing residual solder from the photomask corresponds to that of the photomask, as shown in Figures 3 and 4. The piston rod horizontal adjustment unit 360 is composed of a horizontal shaft 362 and a horizontal adjustment ring 364.

[0078] The upper end of the aforementioned horizontal shaft 362 is fixedly connected to the lower surface of the aforementioned bottom vacuum housing 340, and the lower end is inserted and connected in such a way that it can move up and down along the sliding hole 102 of the base 100 and protrudes to the lower surface of the base.

[0079] A sliding hole 366 is formed at the center of the aforementioned horizontal adjusting ring 364, allowing it to move up and down along the lower outer periphery of the horizontal shaft 362 protruding towards the lower surface of the base. A stop bolt hole 368 is formed that is orthogonally connected to the sliding hole 366, allowing it to be fixed at a position that moves up and down along the outer periphery of the horizontal shaft.

[0080] That is, as shown in Figures 6 to 9, when the push rod 352 of the aforementioned push cylinder 350 rises vertically to a height higher than the contact point between the cleaning paper P and the photomask surface for cleaning, i.e., when the vertical rise distance of the push rod is relatively long, in order to prevent the scraping cleaning mechanism 300 from rising further after reaching the optimal height via the vertically rising push rod, the horizontal adjustment ring 364, which is coupled to the outer periphery of the lower end of the horizontal shaft 362 of the horizontal shaft 362 and is connected to the piston rod horizontal adjustment part 360, is adjusted up and down and fixed. Afterwards, before the push rod 352 rises vertically, the lower end of the horizontal shaft 362 is in a state of protruding from the lower surface of the sliding hole 102 of the base 100. As the push rod 352 rises vertically, the bottom vacuum housing 340 of the scraping cleaning mechanism 300 rises from the upper surface of the base 100. At the same time, the horizontal shaft 362, which is fixedly coupled to the lower surface of the bottom vacuum housing 340, also rises together.

[0081] Subsequently, the vertically rising bottom vacuum housing 340 continues to rise by the vertical rise of the push rod 352 of the push cylinder 350. However, when it approaches the photomask, the lower end of the horizontal axis 362 that moves along the sliding hole 102, i.e., at the position where the horizontal adjustment ring 364 is fixed, contacts the lower surface of the sliding hole 102 of the base 100, thereby restricting the vertical rise of the bottom vacuum housing 340. Therefore, even if the push rod 352 wants to continue to rise vertically, the vertical rise will be restricted, thereby enabling optimal horizontal contact with the photomask surface.

[0082] Therefore, as described above, the rising height of the bottom vacuum housing 340 can be controlled by adjusting the horizontal adjustment ring 364 to move up and down along the outer periphery of the horizontal axis 362.

[0083] On the other hand, as shown in Figures 1 to 4, a guide roller 370 is preferably provided. The guide roller 370 is coupled to the paper supply side of the paper control mechanism of the scraping cleaning mechanism 300 by rotating freely at both ends, and the cleaning paper P is guided to the scraper 320 side of the scraping cleaning mechanism 300 in an unfolded state.

[0084] The guide roller 370 is used to guide the cleaning paper P so that it is fed to the scraper cleaning mechanism 300 without bending, thereby ensuring proper cleaning.

[0085] Furthermore, it is preferable to count the length of the cleaning paper P returned to the receiving roller 220 side, thereby calculating the length of the cleaning paper used for cleaning. This allows for better timing of cleaning paper replacement, minimizing downtime caused by cleaning paper replacement and thus shortening the overall cycle time.

[0086] Therefore, preferably, a counting mechanism 500 is also formed on the upper surface of the base 100 between the scraper cleaning mechanism 300 and the paper discharge side of the paper control mechanism, so as to determine the length of the cleaning paper used. Here, as shown in FIG3, the counting mechanism 500 is composed of a guide gear roller 510, a shaft block 520, a counting rotation member 530, a counting sensor 540 and a control unit.

[0087] The aforementioned guide gear roller 510 is used to place the cleaning paper P, which has been cleaned by the scraper cleaning mechanism 300, before it is returned to the receiving roller 220. The radial guide gears are formed along the left-right length direction so that the cleaning paper P after cleaning is guided and discharged at constant intervals. That is, in the absence of the gear structure of the aforementioned guide gear roller 510, the counting rotation member 530, described later, is guided by the counting sensor 540 in a step-by-step counting manner to prevent the discharged cleaning paper from slipping.

[0088] The aforementioned shaft block 520 is axially connected to the left and right ends of the aforementioned guide gear roller 510 in a manner that allows them to rotate freely. Here, the shaft block 520 is formed upright, connected to the upper end of the base, and corresponding to the height of the position where the cleaning paper P moves downward, so that the cleaning paper, which is cleaned by the scraping cleaning mechanism 300, is guided by the guide gear roller 510.

[0089] The counting rotating member 530 calculates the length of the cleaning paper used for cleaning by calculating the number of counting wings of the counting sensor described later and the length set during one count. The counting rotating member 530 has radially shaped counting wings 532, which are coupled to the outer side of the shaft block 520 on one side of the shaft block 520 to which the guide gear roller 510 is coupled, and rotate together with the rotation of the guide gear roller 510, thereby determining the discharge length of the cleaning paper.

[0090] The aforementioned counting sensor 540 is coupled to a shaft block directly below the counting blades, thereby determining the number of counting blades 532 by measuring the rotation of the counting blades of the counting rotating member 530, and thus determining the length of the cleaning paper used. Here, the counting sensor 540 is formed in a "U" shape, configured to count when the counting blades pass through its center, but it can also be configured in various other forms to perform counting in addition to the above shape.

[0091] The control unit uses the measurement value of the counting sensor 540 to determine the length of the cleaning paper used, thereby controlling the replacement time of the cleaning paper roll.

[0092] On the other hand, a detection sensor 600 is preferably also formed, which detects the release of cleaning paper from the side that supplies cleaning paper P to the center of the base 100 before the cleaning operation of the paper control mechanism 200.

[0093] As shown in Figures 3 and 4, the detection sensor 600 is configured as follows: it continuously detects the supplied cleaning paper; when the last piece of cleaning paper is supplied and the cleaning paper detection signal is interrupted, it compares and calculates the length of the cleaning paper transmitted from the counting sensor 540, thereby generating a cleaning paper replacement signal by the control unit. Conversely, in the absence of a counting mechanism 500, it is preferable to control the replacement time solely by the detection sensor 600.

[0094] As described above, the detection sensor 600 continuously detects the cleaning paper P wound on the support roller 210 during use, but when the cleaning paper on the support roller 210 is used up, the cleaning paper P is no longer detected, thus the replacement time can be determined.

[0095] Therefore, the cleaning paper P wound on the support roller 210 is usually attached to the outer periphery of the support roller 210 by a separate adhesive or tape during the initial winding. When the cleaning paper is attached and fixed to the support roller, a box-shaped support roller 210 with cleaning paper wound on it is formed, which can be replaced by winding the cleaning paper along the outer periphery of the support roller 210.

[0096] Therefore, when the detection sensor 600 detects adhesive or tape wrapped around the support roller 210 in the final step of cleaning with cleaning paper P, it determines the replacement time based on this and notifies the staff to replace it by sending a replacement signal through the control unit.

[0097] On the other hand, as shown in Figures 3, 4, and 6, the cleaning fluid spraying mechanism 400 is configured to spray cleaning fluid onto the cleaning paper, thereby transferring the cleaning fluid to the photomask surface. This allows solder or solder residue remaining on the photomask after printing to be easily removed from the interface with the photomask surface. The cleaning fluid spraying mechanism 400 is located on one side of the scraper cleaning mechanism 300 that supplies the cleaning paper P before cleaning, and has multiple nozzles 402 to spray the cleaning fluid for photomask cleaning onto the cleaning paper P supplied to the cleaning position, so that the cleaning fluid is applied to and wets the cleaning paper before cleaning. Preferably, the cleaning fluid spraying mechanism 400 is formed into a long tubular shape to correspond to the width of the cleaning paper.

[0098] The photomask cleaning method according to the present invention, which utilizes a scraper cleaner of a screen printing press that can save cleaning paper and has the structure and function described above, is shown in FIG5. It consists of a cleaning paper setting step S100, a photomask cleaning preparation first step S200, a photomask cleaning preparation second step S300, a photomask cleaning preparation third step S400, a photomask cleaning step S500, and a scraper cleaner return setting step S600. The photomask is cleaned by repeating the above steps.

[0099] The cleaning paper setting step S100 described above is as follows: The cleaning paper P, before cleaning, is wound around the support roller 210 of the paper control mechanism 200 formed before and after the base 100. The front end of the cleaning paper P wound on the support roller is released, and the paper passes through the guide roller 370, the cleaning liquid spraying mechanism 400, the scraper blade 310 of the scraper cleaning mechanism 300, and the guide gear roller 510 of the counting mechanism 500 before being wound onto the receiving roller 220, thereby cleaning the photomask. The scraper cleaning mechanism 300 has at least two scrapers 320 and vacuum holes 334. The cleaning paper setting step described above is shown in Figure 6.

[0100] In the first step S200 of the above-mentioned photomask cleaning preparation, the cleaning liquid for cleaning the photomask is sprayed onto the cleaning paper P set in the scraper cleaner in the above-mentioned cleaning paper setting step by the cleaning liquid spraying mechanism 400 located between the scraper cleaning mechanism 300 and the support roller 210. The receiving roller 220 is rotated by the forward rotation adjustment motor 230, so that the scraper cleaner including the base moves towards the photomask to be cleaned. At this time, the cleaning paper coated with cleaning liquid is located on the upper side of the scraper blade 310 and scraper plate 320 of the scraper cleaning mechanism 300. This step is also shown in Figure 6.

[0101] The second step S300 of the above-mentioned photomask cleaning preparation includes the following process: The cleaning paper P coated with cleaning solution, which was moved to the side of the photomask to be cleaned by the scraper cleaner in the first step of the photomask cleaning preparation, is positioned on the upper side of the scraper cleaning mechanism 300. The push rod 352 of the push cylinder 350, which is adjusted to the contact mask height according to the piston rod horizontal adjustment part 360, operates, thereby causing the cleaning paper P to rise vertically together with the cleaning paper P. The cleaning paper is released at the support roller 210 at a height corresponding to the vertical movement of the scraper cleaning mechanism 300. The above-mentioned second step of photomask cleaning preparation is illustrated in Figures 6 and 7, which also illustrate the third step of photomask cleaning preparation.

[0102] In the third step S400 of the above-mentioned photomask cleaning preparation, the scraper cleaning mechanism 300 rises towards the photomask side in the second step of the photomask cleaning preparation. Cleaning paper P, released from the support roller 210 to prevent expansion and breakage of the cleaning paper's structure density during the rising process, is reclaimed to the support roller side by the reverse rotation of the support roller 210 driven by the reverse rotation adjustment motor 240. The cleaning paper returns to the position of the scraper 310 in the first step of the photomask cleaning preparation, maintaining flat tension to ensure uniform contact between the cleaning paper and the photomask surface. This step is shown in Figures 7 and 8.

[0103] In the above-mentioned photomask cleaning preparation step S500, after the photomask cleaning preparation is completed by the third step of the above-mentioned photomask cleaning preparation, the cleaning paper comes into contact with the photomask, thereby the entire scraper cleaner moves towards the cleaning paper setting step side. During the movement, the first cleaning is performed by removing the cleaning liquid adhering to the photomask surface by scraper 320, the second cleaning is performed by adsorbing and removing residual solder by vacuum hole 334, and the third cleaning is performed by completely removing the residual solder on the final photomask by scraper 310. The above cleaning is performed as shown in Figure 9, thereby completing the photomask cleaning.

[0104] In the above-mentioned scraper cleaner return setting step S600, after the photomask cleaning step is completed, the scraper cleaner returns to the cleaning paper setting step position, and drives the forward rotation adjustment motor 230 to repeatedly perform the preparation for cleaning by winding the cleaning paper P around the receiving roller 220 at a distance equivalent to half the distance between the two scrapers 310.

[0105] Here, the cleaning paper is wound around the receiving roller for cleaning at a distance equivalent to half the distance between the two scraper blades 310, with at least two scraper blades 310 formed within 5.0 mm. The cleaning paper moving between the scraper blades moves in stages in 2.5 mm units by the scraper cleaner returning to the setting step.

[0106] This minimizes the amount of cleaning paper used in the three-step cleaning process of the photomask cleaning step, which involves a squeegee, vacuum hole, and squeegee. The cleaning paper can be reused according to the degree of contamination during cleaning. Therefore, the optimal length is 2.5mm, which is half the length of the squeegee (5.0mm). This portion of the cleaning paper can be used for cleaning.

[0107] Therefore, compared with conventional cleaners, it can reduce costs by about 80% and shorten replacement intervals, making it very economical. It can also minimize the generation of waste for environmental protection and enable the production of higher quality printed circuit board products.

[0108] On the other hand, between the photomask cleaning step and the scraper cleaner return setting step, the counting mechanism 500 can calculate the amount of cleaning paper used for photomask cleaning, thereby notifying when to replace the cleaning paper. In the cleaning paper setting step, the detection sensor 600 continuously detects the amount of cleaning paper used wound on the support roller, and notifies when to replace the cleaning paper when the signal is interrupted before the last cleaning paper is detected. The result values ​​of the counting mechanism and the detection sensor 600 can also be calculated simultaneously to confirm and notify when to replace the cleaning paper.

[0109] Therefore, the present invention can significantly reduce the amount of cleaning paper used, thereby significantly reducing the amount of waste generated from the cleaned cleaning paper, which is equivalent to special waste, thus helping to prevent environmental pollution. Furthermore, by reducing the amount of paper used, the number of times a single sheet can be used is increased, thereby helping to reduce costs. Moreover, as the number of times a single sheet can be used increases, the replacement time of the cleaning paper also increases, thus significantly reducing the number of times the cleaning paper can be replaced each day. In addition to reducing costs, this invention also has the advantage of improving the workload of staff.

[0110] The present invention has been described in detail above as an embodiment, but the technical means of the present invention are not limited thereto. Those skilled in the art to which the present invention pertains can make various modifications and variations within the scope of the technical concept, and it should be understood that the present invention includes the embodiments and substantially equivalent scope of the present invention.

[0111] 100: Base 102: Sliding hole 200: Paper control mechanism 210: Support roller 220: Receiving roller 230: Forward Rotation Adjustment Motor 240: Reverse rotation adjustment motor 300: Scraper Cleaning System 310: Scraper 320: Scraper 330: Top vacuum housing 332: Scraper-brush joint 334: Vacuum port 340: Bottom vacuum housing 342: Vacuum suction port 350: Push cylinder 352: Putter 360: Piston rod leveling section 362: Horizontal axis 364: Horizontal Adjustment Ring 366: Sliding Hole 368: Stop bolt hole 370: Guide roller 400: Cleaning fluid spraying mechanism 402: Nozzle 500: Counting mechanism 510: Guide gear roller 520: Shaft Block 530: Counting Rotary Component 540: Counting Sensor 600: Detection Sensor S100: Cleaning Paper Setup Steps S200: First step in preparing for photomask cleaning S300: Second step in preparing for mask cleaning S400: Third step in photomask cleaning preparation S500: Photomask Cleaning Procedure S600: Scraper Cleaner Return to Setup Steps P: Cleaning paper

Claims

1. A scraper cleaner for a screen printing machine that saves cleaning paper, comprising: A base (100) is formed along the left-right length direction, and sliding holes (102) that pass through vertically are formed symmetrically on the left and right sides. The base moves to the photomask side and moves back and forth along the front of the photomask. A paper control mechanism (200) is formed in a direction orthogonal to the left-right length direction of the base (100) and is used to wind cleaning paper (P). In order to clean the photomask, the cleaning paper is released, wound, and rotated in the opposite direction in a direction orthogonal to the left-right length direction of the base, thereby maintaining the supply, recycling, and cleanliness of the cleaning paper. The scraper cleaning mechanism (300) is used to vertically raise the cleaning paper for removing residual solder from the photomask when the paper control mechanism (200) supplies the cleaning paper to the cleaning area. The paper control mechanism (200) rotates in the opposite direction to achieve a flat surface on the cleaning paper in the cleaning area. The cleaning paper is also raised and lowered on the upper surface of the base (100) so that the cleaning paper in the flat cleaning area approaches and contacts the photomask to clean it. A cleaning liquid spraying mechanism (400) is provided on one side of the scraper cleaning mechanism (300) supplying the cleaning paper (P) before the cleaning operation. It has multiple nozzles (402) for spraying cleaning liquid for cleaning the photomask onto the cleaning paper (P) supplied to the cleaning position, thereby wetting the cleaning paper by coating it with cleaning liquid before the cleaning operation. The scraper cleaning mechanism (300) includes: At least two or more scrapers (310) are formed to a length corresponding to the left and right width of the cleaning paper (P) before the cleaning operation supplied from the paper control mechanism (200) when it is unfolded; and a scraper (320) is formed to a length corresponding to the left and right length direction of the scrapers (310) and is made of silicon, for wiping away cleaning fluid and solder residue remaining on the photomask from the cleaning fluid transmitted from the cleaning paper (P).

2. The scraper cleaner for a screen printing press as described in claim 1, which saves cleaning paper, wherein, The paper control mechanism (200) includes: a support roller (210) formed elongated along the left-right length direction, which is used on one side of the base to wind cleaning paper (P) before cleaning into a roller shape; and a receiving roller (220) formed elongated along the left-right length direction, which is used on the other side of the base to wind cleaning paper (P) after cleaning into a roller shape. A forward rotation adjustment motor (230) is coupled to and driven on one side of the receiving roller, so that the cleaning paper (P) supplied from the support roller (210) is released and wound around the receiving roller (220) for cleaning; and a reverse rotation adjustment motor (240) is coupled to one side of the support roller (210) so that the section of the cleaning paper (P) used only for cleaning the photomask comes into contact with the photomask, avoiding contamination of the section of the cleaning paper (P) not used for cleaning by solder residue on the photomask. The cleaning paper in the cleaning section is lifted by the scraper cleaning mechanism (300), and the cleaning paper wound around the support roller is temporarily released to stretch it. The reverse rotation forms a flat surface in the section of the stretched cleaning paper (P) used for cleaning the photomask.

3. A scraper cleaner for a screen printing press as described in claim 1, which saves cleaning paper, wherein, The scraper cleaning mechanism (300) further includes: a top vacuum housing (330) that is elongated along the left-right length direction, and a scraper engagement portion (332) protruding on the upper surface with a length corresponding to the left-right width of the cleaning paper, so that the scraper blade (310) and scraper plate (320) can be replaced, and a plurality of vacuum holes (334) are formed through the scraper blade (310) and scraper plate (320) connected to the scraper engagement portion (332), so that the residual solder of the photomask can be adsorbed and removed by the cleaning paper; The bottom vacuum housing (340) is formed to the same length as the top vacuum housing (330) and is connected to the top vacuum housing in a vertically penetrating manner so that the vacuum suction port (342) communicating with the vacuum port (334) can be vacuumed by an external compressor; and the push cylinder (350) is formed symmetrically on the upper surface of the base (100), and the upper end of the push rod (352) is combined with the lower surface of the bottom vacuum housing (340) so that the bottom vacuum housing (340) can be raised and lowered according to the lifting and lowering of the push rod (352).

4. A scraper cleaner for a screen printing press as described in claim 3, which saves cleaning paper, wherein, The scraper cleaner of the screen printing machine that saves cleaning paper has a piston rod leveling adjustment part (360). This piston rod leveling adjustment part (360) adjusts the rising height of the push rod (352) of the push cylinder (350), thereby controlling the rising height of the cleaning paper based on the scraper cleaning mechanism (300) by adjusting the vertical spacing of the bottom vacuum housing (340), so that the cleaning paper used to remove residual solder from the photomask corresponds to the contact position of the photomask. The piston rod leveling adjustment part (360) includes: A horizontal shaft (362) is fixedly attached at its upper end to the lower surface of the bottom vacuum housing (340), and at its lower end is inserted into and attached to the sliding hole (102) of the base (100) in such a way that it moves up and down along the sliding hole (102) of the base (100), and protrudes to the lower surface of the base; and a horizontal adjusting ring (364) is formed with a sliding hole (366) in the center so as to move up and down along the outer periphery of the lower end of the horizontal shaft (362) protruding to the lower surface of the base, and has a stop bolt hole (368) orthogonally connected to the sliding hole (366) so as to fix the horizontal adjusting ring (364) in the position of moving up and down along the outer periphery of the horizontal shaft.

5. A scraper cleaner for a screen printing press as described in claim 3, which saves cleaning paper, wherein, The scraper cleaner of the screen printing press that saves cleaning paper also has a guide roller (370) which is coupled to the cleaning paper supply side of the paper control mechanism of the scraper cleaner (300) in a free-spinning manner at both ends, and guides the cleaning paper (P) to the scraper (320) side of the scraper cleaner (300) in an unfolded state.

6. A scraper cleaner for a screen printing press as described in claim 3, which saves cleaning paper, wherein, The scraper (310) is formed in at least two within 5.0 mm. The cleaning paper (P) used between the scraper (310) to remove residual solder from the photomask moves in stages in 2.5 mm increments as driven by the forward rotation adjustment motor (230).

7. A scraper cleaner for a screen printing press as described in claim 1, which saves cleaning paper, wherein, A counting mechanism (500) is also formed on the upper surface of the base (100) between the scraper cleaning mechanism (300) and the paper control mechanism on the paper discharge side. The counting mechanism (500) measures the length of the cleaning paper used. The counting mechanism (500) includes: a guide gear roller (510) with radially arranged guide gears extending along the left-right length direction to guide and discharge the cleaning paper (P) to be discharged after cleaning at certain intervals; a shaft block (520) that axially connects the left and right ends of the guide gear roller (510) in a way that allows it to idle; and a counting rotating member (530) that is coupled to the outside of the shaft block (520) on one side of the shaft block (520) to which the guide gear roller (510) is coupled. The counting rotating member (530) has radially arranged counting wings (532) that rotate with the rotation of the guide gear roller (510) to measure the discharge length of the cleaning paper. A counting sensor (540) is coupled to a shaft block directly below the counting wing so as to determine the number of counting wings (532) by means of the rotation of the counting wings of the counting rotating member (530), thereby determining the length of use of the cleaning paper; and a control unit determines the length of use of the cleaning paper by means of the measurement value of the counting sensor (540), thereby controlling the time of changing the cleaning paper roll.

8. A scraper cleaner for a screen printing press as described in claim 7, which saves cleaning paper, wherein, The scraper cleaner of the screen printing press that saves cleaning paper also includes a detection sensor (600) that detects the release of cleaning paper from the side supplying cleaning paper (P) toward the center of the base (100) before the paper control mechanism (200) performs a cleaning operation. The detection sensor (600) continuously detects the supplied cleaning paper, and when the last cleaning paper supply is completed and the cleaning paper detection signal is cut off, it compares and calculates with the length of the cleaning paper sent from the counting sensor (540), thereby generating a cleaning paper replacement signal from the control unit.

9. A method for cleaning the photomask of a screen printing press using a scraper cleaner that saves cleaning paper, wherein, The photomask cleaning method repeats the following steps to clean the photomask: A cleaning paper setting step (S100) in which cleaning paper (P) is wound around a support roller (210) of a paper control mechanism (200) formed before and after the base (100). The front end of the cleaning paper (P) wound on the support roller is released, and the paper passes through a guide roller (370), a cleaning liquid spraying mechanism (400), at least two scrapers (310) of a scraper cleaning mechanism (300), and a guide gear roller (510) of a counting mechanism (500) before being wound onto a receiving roller (220). This cleans the photomask. The photomask is cleaned, and the scraper cleaning mechanism (300) has at least two scrapers (320) and a vacuum hole (334). The scraper (310) is formed to a length corresponding to the left and right width of the cleaning paper (P) supplied from the paper control mechanism (200) before the cleaning operation is unfolded, and the scraper (320) is formed to a length corresponding to the left and right length direction of the scraper (310). It is made of silicon and is used to wipe away the cleaning liquid and solder residue remaining on the photomask in the cleaning liquid transmitted from the cleaning paper (P). In the first step (S200) of photomask cleaning preparation, a cleaning liquid for cleaning the photomask is sprayed onto the cleaning paper (P) set in the scraper cleaner by the cleaning liquid spraying mechanism (400) located between the scraper cleaning mechanism (300) and the support roller (210). The receiving roller (220) is rotated by the forward rotation adjustment motor (230), so that the scraper cleaner including the base moves toward the photomask to be cleaned. At this time, the cleaning paper coated with cleaning liquid is located on the upper side of the scraper blade (310) and scraper plate (320) of the scraper cleaning mechanism (300). In the second step (S300) of photomask cleaning preparation, the cleaning paper (P) coated with cleaning liquid, which was moved to the side of the photomask to be cleaned by the first step of photomask cleaning preparation, is located on the upper side of the scraper cleaning mechanism (300). The push rod (352) of the push cylinder (350) which is adjusted to the contact mask height according to the piston rod horizontal adjustment part (360) works, thereby rising vertically together with the cleaning paper (P), and the cleaning paper is released at the support roller (210) in a manner corresponding to the height of the vertical movement of the scraper cleaning mechanism (300). In the third step (S400) of photomask cleaning preparation, the scraper cleaning mechanism (300) rises towards the photomask side by means of the second step of photomask cleaning preparation. The cleaning paper (P) released from the support roller (210) is recycled to the support roller side by the reverse rotation adjustment motor (240) through the reverse rotation of the support roller (210), and the cleaning paper returns to the position of the scraper (310) in the first step of photomask cleaning preparation, maintaining flat tension so that the cleaning paper is in uniform contact with the photomask surface.In the photomask cleaning step (S500), after the photomask cleaning preparation is completed in the third photomask cleaning preparation step, the cleaning paper contacts the photomask, and the entire scraper cleaner moves towards the cleaning paper setting step side. During the movement, a first cleaning is performed to remove the cleaning liquid adhering to the photomask surface by the scraper (320), a second cleaning is performed to adsorb and remove residual solder by the vacuum hole (334), and a third cleaning is performed to completely remove the residual solder on the final photomask by the scraper blade (310). In the scraper cleaner return setting step (S600), after the photomask cleaning step is completed, the scraper cleaner returns to the cleaning paper setting step position, and the forward rotation adjustment motor (230) is driven by winding the cleaning paper (P) around the receiving roller (220) at a distance equivalent to half the distance between the two scraper blades (310).

10. The photomask cleaning method of a screen printing press using a scraper cleaner that saves cleaning paper, as described in claim 9, wherein, The scraper (310) forms at least two cleaning papers (P) within a range of 5.0 mm, and the cleaning paper (P) moving between the scrapers moves in stages in 2.5 mm increments by means of the scraper cleaner returning to the setting step.

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