Printing unit for MLCC printing

Abstract

The invention discloses a printing unit for MLCC printing, and aims to solve the problem of poor printing caused by foreign matters in slurry. The printing unit comprises a printing roller plate and a scraper, and is characterized by further comprising a pre-scraper and a mounting seat for mounting the pre-scraper, the pre-scraper is arranged on the upstream side of the scraper in the rotating direction of the printing roller plate through the mounting base and faces the surface of the printing roller plate. According to the structure, the pre-scraper can pre-process slurry, and interference of foreign matter on the subsequent precise slurry scraping procedure is effectively reduced. The application can further comprise preferable schemes such as harder material of the pre-scraping knife, adjustable spacing and locked position. The device is clear in structure and easy to be additionally arranged on existing equipment, and the printing quality and stability can be effectively improved.

Description

Technical Field

[0001] This application relates to the field of chip component manufacturing technology, specifically to a printing unit for MLCC printing. Background Technology

[0002] In the production of multilayer ceramic capacitors (MLCCs), the internal electrode patterns are typically prepared using gravure printing. A traditional printing unit mainly consists of a printing roller and a doctor blade. The printing roller has grooves engraved on its surface; during operation, part of it is immersed in a paste tank, filling the grooves with conductive paste. Subsequently, the rotating printing roller passes over a fixed doctor blade, which removes excess paste from the roller surface, leaving only a measured amount of paste within the grooves. Finally, an impression cylinder presses the ceramic dielectric film against the roller, completing the paste transfer and forming the internal electrode pattern.

[0003] In actual production, to ensure effective squeegee application without damaging the delicate cell structure of the printing roller, squeegees are typically made of softer materials such as plastic. However, tiny solidified particles or environmental foreign matter may be mixed into the squeegee. When these foreign objects move with the squeegee to the squeegee, the harder ones can hinder the effective squeegee application, potentially leading to two adverse consequences: first, the foreign objects directly scratch or clog the graphic grooves on the printing roller, causing damage or loss of the printed graphic; second, the foreign objects become embedded between the squeegee and the printing roller, causing abnormal squeegee accumulation at that point, resulting in raised "black lines" on the electrode graphic after transfer. These defects severely affect the electrical performance and reliability of MLCC products. Therefore, effectively preventing foreign objects in the squeegee from interfering with squeegee operation has become a key issue in improving the printing quality of MLCCs. Summary of the Invention

[0004] Therefore, it is necessary to provide a printing unit for MLCC printing to solve the problems in the prior art.

[0005] The above-mentioned objective of this application is achieved through the following technical solution: This application provides a printing unit for MLCC printing, including a printing roller and a doctor blade, and further comprising: A pre-scraper and a mounting base for mounting the pre-scraper; The pre-scraper is positioned upstream of the scraper along the rotation direction of the printing roller via the mounting base, and faces the surface of the printing roller.

[0006] In one embodiment, the material hardness of the pre-scraper is higher than that of the scraper.

[0007] In one embodiment, the pre-scraper is a metal scraper, and the scraper is a plastic scraper or a metal scraper with a ceramic coating.

[0008] In one embodiment, the distance between the pre-squeegee and the surface of the printing roller is set to be greater than the distance between the squeegee and the surface of the printing roller.

[0009] In one embodiment, the mounting base is connected to a scraper holder for mounting the scraper.

[0010] In one embodiment, a spacing adjustment component is further included, which is connected between the mounting base and the pre-scraper for adjusting the spacing between the pre-scraper and the surface of the printing roller.

[0011] In one embodiment, the spacing adjustment component includes an active adjustment mechanism and a reverse elastic balancing mechanism; The active adjustment mechanism is operably connected to the pre-squeegee and is used to drive the pre-squeegee to move in a direction toward or away from the printing roller. The reverse elastic balancing mechanism is elastically connected between the mounting base and the pre-scraper, and the direction of its elastic force is opposite to the main direction in which the active adjustment mechanism drives the pre-scraper to move. By operating the active adjustment mechanism to change the position of the pre-scraper, the deformation of the reverse elastic balancing mechanism changes accordingly, thereby achieving balance with the adjustment force provided by the active adjustment mechanism at the new position.

[0012] In one embodiment, the active adjustment mechanism includes a first adjusting screw and a first elastic element; The first adjusting screw is screwably mounted on the mounting base; The first elastic element is compressed between the end of the first adjusting screw and the pre-scraper or a component fixedly connected to the pre-scraper.

[0013] In one embodiment, the reverse elastic balancing mechanism includes a first adjusting rod and a second elastic element; The first adjusting rod passes through the mounting base and is fixedly connected to the pre-scraper or a component fixedly connected to the pre-scraper; The second elastic element is compressed between the head of the first adjusting rod and the mounting base.

[0014] In one embodiment, the pre-scraper is mounted via a pre-scraper holder, and the pre-scraper holder and the mounting base are relatively fixed by a releasable locking structure to maintain the position of the pre-scraper after adjustment. The locking structure includes a waist-shaped hole extending along the adjustment direction and a locking member passing through it. The pre-scraper clamping seat is fixed to the mounting base at different positions in the waist-shaped hole by the locking member.

[0015] This application has at least the following beneficial effects: This application constructs a novel structure for collaborative operation of two doctor blades by adding a pre-squeegee and mounting base upstream of the doctor blade along the rotation direction of the printing roller. The upstream pre-squeegee pre-treats the slurry layer before the main doctor blade, effectively intercepting or removing foreign matter that may cause printing defects, thus significantly reducing the workload and interference risk of the downstream main doctor blade. This structure reduces printing defects or poor black lines caused by foreign matter at the source, improving the yield and consistency of MLCC internal electrode printing.

[0016] Furthermore, by making the material hardness of the pre-scraper higher than that of the main scraper, the ability to handle foreign objects is enhanced; by setting the distance between the pre-scraper and the roller plate to be greater than the distance between the main scraper and the roller plate, damage to the roller plate is avoided while working effectively; the connection between the mounting base and the original scraper base facilitates modification; and by setting the distance adjustment component and locking structure, the position of the pre-scraper is precisely adjusted and stably fixed. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this application and to more completely understand this application and its beneficial effects, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the overall structure of a printing unit used in traditional MLCC printing technology. Figure 2 This is a schematic diagram of the structure of a printing unit for MLCC printing in one embodiment of this application; Figure 3 This is a schematic diagram of the structure of a printing unit for MLCC printing in one embodiment of this application; Figure 4-5 This is a schematic diagram of the spacing adjustment component of the printing unit for MLCC printing in one embodiment of this application.

[0019] Icon labels: 100. Printing roller; 120. Graphic groove; 130. Impression cylinder; 200. Squeegee holder; 300. Squeegee; 400. Pre-squeegee; 403. Pre-squeegee holder; 4031. Upper clamping block; 4032. Lower clamping block; 404. First oblong hole; 500. Mounting base; 501. Upper mounting block; 502. Lower mounting block; 503. Accommodating cavity; 504. Threaded hole; 600. Spacing adjustment assembly; 610. Active adjustment mechanism; 611. First adjusting screw; 612. First elastic element; 620. Reverse elastic balance mechanism; 621. First adjusting rod; 622. Second elastic element; 700. Locking element; 800. Ceramic dielectric film; 900. Slurry supply unit. Detailed Implementation

[0020] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0021] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the system or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0022] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0023] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0024] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0025] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0026] like Figure 1 As shown, a traditional printing unit includes components such as a printing roller 100, an impression cylinder 130, a paste supply unit 900, and a doctor blade 300. The printing roller 100 has a cylindrical structure with a roller shaft located at the center along the axial direction. Several recessed grooves 120 with shapes that are completely consistent with the design of the inner electrode are engraved on its outer circumference.

[0027] The working process is as follows: The paste supply section 900 is located below the printing roller 100 and stores conductive paste inside. During operation, the printing roller 100 is driven by a motor to rotate circumferentially (arrow X direction), and part of its graphic grooves 120 are immersed in the paste tank of the paste supply section 900, so that the graphic grooves 120 are filled with paste. Subsequently, the surface of the rotating printing roller 100 passes through the scraper 300 set on the side, and the excess paste is scraped off, leaving only a certain amount of paste in the graphic grooves 120. At the same time, the impression cylinder 130 (usually an elastomer) rotates synchronously above the printing roller 100 (arrow D direction), and together with the printing roller 100, it clamps and transports the ceramic dielectric film 800 (arrow E direction). When the patterned groove 120 carrying the paste rotates to a position where it contacts the ceramic dielectric film 800, the impression cylinder 130 applies pressure to press the ceramic dielectric film 800 against the printing roller 100, and the paste in the patterned groove 120 is transferred to the surface of the ceramic dielectric film 800, thereby forming an internal electrode pattern.

[0028] In the gravure printing process of MLCCs, hard foreign objects in the paste are the main cause of defects in the printed image or poor black lines. Traditional single soft doctor blades cannot effectively solve this problem, while simply replacing the doctor blade with a hard material will damage the precision printing roller. The core concept of this application is to break away from the conventional thinking of "one blade" and propose a solution of "functional separation and collaborative work": upstream of the original soft doctor blade (300) responsible for precision paste scraping, a pre-scraper blade (400) is added to intercept foreign objects. The pre-scraper blade (400) with higher hardness can effectively scrape off the protruding foreign objects on the surface of the paste layer without strong contact with the roller. Subsequently, the "pre-treated" paste flows to the downstream soft doctor blade (300) to complete the precise and uniform paste scraping operation. This solution not only eliminates foreign object interference, but also perfectly protects the roller and the main doctor blade, significantly improving printing quality and stability.

[0029] This application provides a printing unit for MLCC printing. Please refer to... Figure 2 and Figure 3 The printing unit includes the following components: Printing roller 100: A well-known component in the art, it is cylindrical and can rotate about its own axis. Figure 1 Arrow X direction. Its outer peripheral surface is engraved with designed graphic grooves for receiving slurry, not shown.

[0030] Squeegee 300: This is an existing component on which the improvement of this application is based. It is long and narrow, and the squeegee 300 is fixed to the side of the printing roller 100 by a squeegee seat 200.

[0031] The pre-scraper 400 and the mounting base 500 are new components added in this application. The pre-scraper 400 is also elongated, and the mounting base 500 is a mechanical base or frame for fixing and supporting the pre-scraper 400.

[0032] This refers to the pre-scraper 400 being directly or indirectly mounted on the mounting base 500, with the mounting base 500 providing support and positioning.

[0033] like Figure 1 As shown, the printing roller 100 carries the ink and rotates counterclockwise in the X direction. The upstream side refers to the side that the ink flows through before passing the doctor blade 300, relative to its position. In this embodiment, the pre-dossor 400 is installed at this position.

[0034] The cutting edge of the pre-squeegee 400 faces the outer peripheral surface of the printing roller 100 and remains parallel to it or at a very small angle, so as to act on the paste layer on its surface.

[0035] During operation, the printing roller 100 rotates, with its lower half immersed in a paste tank (not shown), filling the grooves in the surface pattern with paste. When the roller surface, with attached paste and any foreign matter, rotates to position A where the pre-squeegee 400 is located, the pre-squeegee 400 begins operation. Its function is to pre-treat the paste layer, primarily by intercepting or scraping away larger, harder foreign particles. Subsequently, the pre-treated paste layer continues to rotate with the roller to position B where the squeegee 300 is located. At this point, the squeegee 300 performs a precise scraping operation on the relatively clean paste layer, evenly removing excess paste from the roller surface outside the grooves, leaving only a fixed amount of paste in the grooves for subsequent transfer.

[0036] This embodiment of the application achieves pretreatment of the slurry by setting a pre-scraper upstream of the main scraper, blocking most hard foreign objects outside the working area of ​​the main scraper. This fundamentally eliminates the problem of uneven slurry scraping or pattern damage caused by foreign objects, thereby significantly reducing the risk of printed patterns being defective or having poor black lines.

[0037] In one embodiment, the pre-scraper 400 has a higher material hardness than the scraper 300. This means that when the cutting edge of the pre-scraper 400 comes into contact with foreign particles in the slurry, its tendency to undergo plastic deformation or damage is much lower than the tendency for the foreign particles to be pushed or broken, thus effectively removing foreign matter. As a specific and preferred embodiment, the pre-scraper 400 can be a metal scraper, for example, made of wear-resistant stainless steel such as 304, 440C, or hard alloy; while the scraper 300 is preferably a plastic scraper, for example, made of engineering plastics such as polyurethane (PU), polyethylene (PE), or polyester; the scraper 300 can also be a metal scraper with a ceramic coating. The metal material gives the pre-scraper 400 sufficient strength and hardness to handle foreign matter, while the plastic material or the ceramic coating on the metal scraper ensures the main scraper 300's friendliness to the roller during precision scraping. The combination of the two achieves a balance of rigidity and flexibility.

[0038] In a preferred embodiment, the distance between the pre-squeegee 400 and the surface of the printing roller 100 is set to be greater than the distance between the squeegee 300 and the surface of the printing roller 100. This feature defines a fundamentally different operating mode for the pre-squeegee and the main squeegee.

[0039] The spacing of the scraper blades is 300: In order to achieve uniform and thorough scraping, the blades are usually pressed slightly against the roller surface with a certain pressure. The theoretical spacing is zero or in a negative interference state, which is a contact operation.

[0040] The spacing of the pre-scraper blades 400 is set to a specific positive value, greater than the spacing of the main scraper blades. This means that the pre-scraper blades 400 operate in a non-contact or micro-gap manner. This gap is designed to be slightly larger than the thickness of the normal slurry layer, but smaller than the slurry layer thickness plus the typical foreign object size. Its working principle is that normal slurry fluid can pass smoothly through this gap, while hard foreign objects protruding above the slurry layer will interfere with the pre-scraper blade edge, thus being blocked, peeled off, or broken. This feature ensures that the hard pre-scraper blades 400 do not wear down the roller surface as much as hard scraper blades operating in contact.

[0041] In one embodiment, such as Figure 2-5As shown, the mounting base 500 is connected to the doctor blade holder 200 for mounting the doctor blade 300. Specifically, the mounting base 500 can be designed as a frame structure composed of an upper mounting block 501 and a lower mounting block 502 assembled by fasteners (such as screws). The upper mounting block 501 is L-shaped, and the main bodies of the upper mounting block 501 and the lower mounting block 502 are parallel to each other and spaced apart, together forming a receiving cavity 503 with an open front end. The mounting base 500 is fixed to the doctor blade holder 200 by bolts through its upper mounting block 501, thereby achieving a quick and stable integrated installation. The biggest advantage of this connection method is that it facilitates the modification and upgrading of existing equipment. Users do not need to change the overall structure or main support of the printing equipment; they only need to add the pre-dosing blade assembly of this application to the existing doctor blade holder 200, which is simple to implement and has low modification costs.

[0042] In one embodiment, such as Figures 2 to 5 As shown, it also includes a spacing adjustment assembly 600, which is connected between the mounting base 500 and the pre-squeegee 400. Its function is to allow the operator to precisely and conveniently adjust and set the spacing between the pre-squeegee 400 and the printing roller surface to adapt to different paste characteristics or process requirements. The spacing adjustment assembly 600 can be any mechanical structure capable of precisely adjusting the distance between the pre-squeegee 400 and the printing roller 100, such as a screw adjustment mechanism, an eccentric wheel mechanism, or a wedge mechanism.

[0043] Specifically, the spacing adjustment component 600 includes an active adjustment mechanism 610 and a reverse elastic balancing mechanism 620, which work together to achieve a unique single-point adjustment and bidirectional elastic self-balancing mechanism.

[0044] like Figures 2 to 5 As shown, the active adjustment mechanism 610 includes a first adjusting screw 611 and a first elastic element 612. The first adjusting screw 611 is screwed into a threaded hole in the mounting base 500. The first elastic element 612, preferably a helical compression spring, is compressed between the end of the first adjusting screw 611 facing the pre-scraper and a pre-scraper holder 403. The pre-scraper holder 403 is used to fix the pre-scraper 400, and the two can be considered as a single moving unit. When the first adjusting screw 611 is screwed clockwise, the screw moves forward toward the printing roller, further compressing the first elastic element 612, thereby generating a force F1 that pushes the pre-scraper holder 403 and the pre-scraper 400 together toward the printing roller.

[0045] The reverse elastic balancing mechanism 620 includes a first adjusting rod 621 and a second elastic element 622. The first adjusting rod 621 is a smooth rod that passes through a smooth guide hole on the mounting base 500, and its end is fixedly connected to the pre-scraper clamping seat 403. The second elastic element 622 is preferably a helical compression spring, which is compressed between the head of the first adjusting rod 621 located outside the mounting base 500 and the outer surface of the mounting base 500.

[0046] When the first adjusting screw 611 is screwed in, pushing the pre-scraper 400 forward, the fixedly connected first adjusting rod 621 is also pulled forward synchronously. This causes the second elastic element 622 between the head of the first adjusting rod 621 and the mounting base 500 to be further compressed, thereby generating an elastic restoring force F2 that gradually increases in the direction of the roller. This force F2 is opposite in direction to the thrust F1 generated by the active adjusting mechanism. The pre-scraper 400 will automatically stabilize at a position where the thrust F1 and the restoring force F2 are balanced. Therefore, by simply rotating the first adjusting screw 611, the position of the pre-scraper can be adjusted steplessly and smoothly, and the force balance is automatically maintained after adjustment, resulting in a stable state. To increase the spacing, simply rotate the first adjusting screw 611 in the opposite direction.

[0047] Although the spacing adjustment component 600 has elastic self-balancing characteristics, factors such as equipment vibration may cause interference in actual continuous printing. Therefore, this embodiment adds a releaseable locking structure.

[0048] like Figures 2 to 5 As shown, the pre-scraper 400 is mounted via a separate pre-scraper holder 403. This holder employs a modular design, consisting of an upper clamping block 4031 and a lower clamping block 4032 assembled with fasteners, forming a precise mounting groove between them. The blade body of the pre-scraper 400 can be easily inserted into this mounting groove, while its handle extends beyond the holder and can be quickly clamped and secured using a through-type set screw. This design allows for quick assembly, disassembly, and replacement of the pre-scraper 400, simplifying routine maintenance.

[0049] To achieve precise adjustment and final locking of the overall position of the pre-scraper 400, the pre-scraper holder 403 and the mounting base 500 are relatively fixed through a releasable locking structure.

[0050] Specifically, on the upper clamping block 4031 and lower clamping block 4032 of the pre-scraper holder 403, a first oblong hole 404 is respectively provided along the adjustment direction close to or away from the printing roller 100. As a key improvement of this embodiment, a second oblong hole (not shown) extending along the same adjustment direction is also provided on the handle portion of the pre-scraper 400. When the pre-scraper 400 is fixed by the holder 403, the second oblong hole on its handle is precisely aligned with the first oblong hole 404 on the upper and lower clamping blocks.

[0051] The entire locking mechanism is designed for fastening from below where operating space is limited. A threaded hole 504 is machined on the upper mounting block 501 of the mounting base 500 at a position corresponding to the aforementioned oblong hole path. At the corresponding position on the lower mounting block 502, a through hole (not shown) with a diameter slightly larger than the rod portion of the locking member 700 is machined. The locking member 700 is preferably a bolt, and its installation direction is designed from bottom to top. During operation, the locking member 700 is passed sequentially from below through the through hole in the lower mounting block 502, the first oblong hole 404 in the lower clamping block 4032, the second oblong hole on the handle of the pre-scraper 400, and the first oblong hole 404 in the upper clamping block 4031, and finally screwed into the threaded hole 504 in the upper mounting block 501.

[0052] The operation and locking principle are as follows: After the pre-scraper 400 is finely adjusted to the optimal working position using the spacing adjustment component 600, the locking component 700 is tightened from below using a tool. As the locking component 700 is tightened, its head presses upward against the lower surface of the lower mounting block 502, while the threaded portion pulls the upper mounting block 501 upward. This action causes the upper mounting block 501 and the lower mounting block 502 to tend to move in opposite directions, thereby firmly pressing and fixing the pre-scraper clamping seat 403 and the pre-scraper 400 handle, located in its accommodating cavity 503, as a whole. The locking force acts directly on the upper clamping block 4031, the pre-scraper handle, and the lower clamping block 4032, converting into a huge static friction force, ensuring that there is no relative slippage between the pre-scraper 400, the clamping seat 403, and the mounting seat 500, which is sufficient to resist working vibrations in all directions.

[0053] In a preferred embodiment, such as Figure 4 and Figure 5 As shown, two sets of the aforementioned locking structures are arranged side by side along the axial extension direction of the printing roller 100. This symmetrical layout provides the pre-squeegee 400 with more balanced guidance and tighter dual-point locking, further enhancing its overall stability and torsional resistance during high-speed printing.

[0054] This embodiment, through a quick-change clamping base, a double-locking design including a blade handle waist-shaped hole, and a bottom-up locking method, constitutes a robust, precise, and easy-to-maintain pre-squeegee fixing system. This ensures that the pre-squeegee 400 maintains its positional accuracy over a long period in high-speed, vibrating printing environments, thus providing a reliable guarantee for achieving stable print quality.

[0055] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0056] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of protection of this application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these modifications and improvements all fall within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the appended claims.

Claims

1. A printing unit for MLCC printing, comprising a printing roller (100) and a doctor blade (300), characterized in that, Also includes: A pre-scraper (400) and a mounting base (500) for mounting the pre-scraper (400); The pre-scraper (400) is disposed on the upstream side of the scraper (300) along the rotation direction of the printing roller (100) via the mounting base (500) and faces the surface of the printing roller (100).

2. The printing unit according to claim 1, characterized in that, The material hardness of the pre-scraper (400) is higher than that of the scraper (300).

3. The printing unit according to claim 1 or 2, characterized in that, The pre-scraper (400) is a metal scraper, and the scraper (300) is a plastic scraper or a metal scraper with a ceramic coating.

4. The printing unit according to claim 1, characterized in that, The distance between the pre-scraper (400) and the surface of the printing roller (100) is set to be greater than the distance between the scraper (300) and the surface of the printing roller (100).

5. The printing unit for MLCC printing according to claim 1, characterized in that: The mounting base (500) is connected to a scraper holder (200) for mounting the scraper (300).

6. The printing unit for MLCC printing according to claim 1, characterized in that: It also includes a spacing adjustment component (600) connected between the mounting base (500) and the pre-scraper (400) for adjusting the spacing between the pre-scraper (400) and the surface of the printing roller (100).

7. The printing unit for MLCC printing according to claim 6, characterized in that: The spacing adjustment assembly (600) includes an active adjustment mechanism (610) and a reverse elastic balancing mechanism (620). The active adjustment mechanism (610) is operably connected to the pre-squeegee (400) for driving the pre-squeegee (400) to move in a direction toward or away from the printing roller (100); The reverse elastic balancing mechanism (620) is elastically connected between the mounting base (500) and the pre-scraper (400), and the direction of its elastic force is opposite to the main direction in which the active adjustment mechanism (610) drives the pre-scraper (400) to move. By operating the active adjustment mechanism (610) to change the position of the pre-scraper (400), the deformation of the reverse elastic balancing mechanism (620) changes accordingly, thereby achieving balance with the adjustment force provided by the active adjustment mechanism (610) at the new position.

8. The printing unit for MLCC printing according to claim 7, characterized in that: The active adjustment mechanism (610) includes a first adjustment screw (611) and a first elastic element (612). The first adjusting screw (611) is screwably mounted on the mounting base (500); The first elastic element (612) is compressed between the end of the first adjusting screw (611) and the pre-scraper (400) or a component fixedly connected to the pre-scraper (400).

9. The printing unit for MLCC printing according to claim 8, characterized in that: The reverse elastic balancing mechanism (620) includes a first adjusting rod (621) and a second elastic element (622); The first adjusting rod (621) passes through the mounting base (500) and is fixedly connected to the pre-scraper (400) or a component fixedly connected to the pre-scraper (400); The second elastic element (622) is compressed between the head of the first adjusting rod (621) and the mounting base (500).

10. The printing unit for MLCC printing according to claim 1, characterized in that: The mounting base (500) includes an upper mounting block (501) and a lower mounting block (502), which together form an accommodating cavity (503). The pre-scraper (400) is mounted via a pre-scraper holder (403), and the pre-scraper holder (403) and the handle portion of the pre-scraper (400) are housed within the accommodating cavity (503). The pre-scraper holder (403) includes an upper clamping block (4031) and a lower clamping block (4032), and the handle of the pre-scraper (400) is clamped between the two. The upper clamping block (4031) and the lower clamping block (4032) are respectively provided with a first waist-shaped hole (404) extending in the adjustment direction, and the handle of the pre-scraper (400) is respectively provided with a second waist-shaped hole extending in the same adjustment direction. The lower mounting block (502) of the mounting base (500) is provided with a through hole for the locking member (700) to pass through, and the upper mounting block (501) is provided with a threaded hole (504) that mates with the locking member (700). The locking member (700) passes through the through hole of the lower mounting block (502), the first waist-shaped hole (404) of the lower clamping block (4032), the second waist-shaped hole on the handle of the pre-scraper (400), and the first waist-shaped hole (404) of the upper clamping block (4031) from bottom to top, and engages with the threaded hole (504) of the upper mounting block (501), thereby pressing and fixing the pre-scraper clamping seat (403) and the pre-scraper (400) together on the mounting seat (500).

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