Flexographic coating and dyeing machine

Abstract

This utility model relates to the field of coating machine technology, and provides a dual-purpose machine for screen roller flexographic coating and dyeing, including a frame; a screen roller rotatably mounted on the frame; a rubber roller rotatably mounted on the frame, located above the screen roller, with a first roller pressure seam formed between the rubber roller and the screen roller for smooth packaging material to pass through; a smooth roller rotatably mounted on the frame, located above the rubber roller, with a second roller pressure seam formed between the smooth roller and the rubber roller for packaging material with raised surfaces to pass through; when the packaging material surface has raised surfaces, the packaging material passes through the second roller pressure seam formed by the rubber roller and the smooth roller. After the screen roller is coated with dye, excess dye is scraped off by a doctor blade, and then it rolls against the rubber roller, transferring the screen pattern to the surface of the rubber roller; the rubber roller continues to rotate to the second roller pressure seam position, and under the pressure of the smooth roller, the rubber roller transfers the screen pattern on its surface to the packaging material. Through the intermediate transfer action of the rubber roller, interference from raised surfaces to direct printing is avoided.

Description

Technical Field

[0001] The embodiments of this utility model relate to the field of coating machine technology, specifically to a dual-purpose machine for flexographic coating and dyeing using a screen roller. Background Technology

[0002] In the traditional packaging and printing industry, anilox rollers (or simply anilox rollers) have a regularly distributed anilox pattern on their surface, which can be used to carry printing media (such as ink). To transfer the anilox pattern to the packaging material, the industry generally uses a combination of anilox rollers and rubber rollers. The rubber rollers are made of rubber or other flexible materials and are installed directly above the anilox rollers, forming a collaborative printing execution unit.

[0003] The existing traditional anilox printing process is as follows: First, the anilox grooves on the surface of the anilox roller absorb a sufficient amount of printing medium, ensuring a clear anilox pattern and uniform medium distribution. Then, the packaging material to be printed passes through the gap between the anilox roller and the rubber roller, and the equipment drives the rubber roller to press the packaging material tightly against the surface of the anilox roller. Simultaneously, the anilox roller and the rubber roller rotate synchronously, and the direct contact between the packaging material and the anilox roller transfers the printing medium from the anilox grooves of the anilox roller directly to the surface of the packaging material, allowing the anilox pattern to be completely printed on the material, thus completing the entire printing process. This method has been widely used in the traditional packaging printing field for a long time due to its simple structure, low equipment cost, and convenient operation, requiring only two rollers.

[0004] However, traditional printing methods have significant technical defects. When the surface of the packaging material to be printed has unevenness (such as raised dots, local burrs, etc.), the packaging material around the raised dots cannot fit tightly against the surface of the screen roller. The raised dots provide support, but tiny gaps are created between the surrounding material and the screen roller, preventing contact with the printing medium in the screen roller's anilox grooves. Consequently, the packaging material area around the raised dots cannot be printed with anilox patterns, resulting in obvious blank printing, pattern breaks, or color loss. This severely damages the integrity and consistency of the overall printing effect of the packaging material, reduces the pass rate of printed products, and makes it difficult to meet the basic requirements of the packaging printing industry for the surface printing quality of products. Utility Model Content

[0005] To overcome the above-mentioned defects, this utility model provides a dual-purpose machine for screen roller flexographic coating and dyeing, which solves the technical problem that when the surface of the packaging material to be printed has unevenness, such as raised bumps or local burrs, the packaging material around the bumps cannot be tightly adhered to the surface of the screen roller.

[0006] According to one aspect, at least one embodiment of the present invention provides a dual-purpose machine for flexographic coating and dyeing using a screen roller, comprising: a frame; The screen roller is rotatably mounted on the frame. A rubber roller is rotatably mounted on the frame and positioned above the mesh roller. A first roller press seam is formed between the rubber roller and the mesh roller to allow packaging material with a smooth surface to pass through. A smooth roller is rotatably mounted on the frame and positioned above the rubber roller. A second roller press seam is formed between the smooth roller and the rubber roller for packaging material with raised surfaces to pass through. In this process, packaging material with a smooth surface passes through a first roller for seam pressing. The rubber roller presses the packaging material against the screen roller so that the screen pattern on the screen roller is directly printed onto the packaging material that has passed through the first roller for seam pressing. Packaging material with raised dots on its surface passes through a second roller for seam pressing. The rubber roller rolls into contact with the screen roller located below, so that the screen pattern is printed onto the surface of the rubber roller. The rubber roller then transfers the screen pattern to the packaging material that has passed through the second roller for seam pressing.

[0007] For example, in at least one embodiment of the present invention, the flexographic coating and dyeing machine is located directly above the flexographic roller, and the smooth roller is located directly above the smooth roller.

[0008] For example, in at least one embodiment of the present invention, a dual-purpose machine for flexographic coating and dyeing of screen rollers is provided, which further includes a scraper, disposed on the frame and located on the feed side or discharge side of the screen roller, the scraper being used to scrape off excess pigment from the surface of the screen roller.

[0009] For example, in at least one embodiment of the present invention, the flexographic coating and dyeing machine is movable and vertically mounted on the frame, and is movable and vertically positioned on the feed side or discharge side of the flexographic roller; the flexographic coating and dyeing machine further includes: A mobile drive assembly, mounted on the frame, is used to drive the scraper to move; A lifting drive assembly is mounted on the frame and is used to drive the scraper to lift and lower.

[0010] For example, in at least one embodiment of the present invention, the dual-purpose machine for flexographic coating and dyeing of screen rollers further includes: a platform, which is movably mounted on the frame and is used to support the lifting drive assembly; A base is disposed at the drive end of the lifting drive assembly, and the base is used to support the scraper.

[0011] For example, in at least one embodiment of the present invention, the dual-purpose machine for flexographic coating and dyeing using a screen roller includes: The lead screw is rotatably mounted on the frame and threadedly connected to the threaded through hole inside the platform. A drive motor, mounted on the frame, is used to drive the lead screw to rotate.

[0012] For example, in the dual-purpose screen roller flexographic coating and dyeing machine provided in at least one embodiment of the present invention, the scraper has two symmetrically arranged scraper portions. The scraper is configured such that when it is located on the feed side of the screen roller, one of the scraper portions is used to scrape the screen roller, and when it is located on the discharge side of the screen roller, the other scraper portion is used to scrape the surface of the screen roller.

[0013] For example, in at least one embodiment of the present invention, the two doctor blades are snap-fitted together.

[0014] For example, in at least one embodiment of the present invention, the flexographic coating and dyeing machine has a locking groove and a locking block. The locking groove and the locking block are arranged in a stepped manner at different heights. The locking block of one flexographic coating machine is used to lock and connect with the locking groove of another flexographic coating machine.

[0015] For example, in the dual-purpose screen roller flexographic coating and dyeing machine provided in at least one embodiment of the present invention, the snap-fit ​​block is provided with a fixing hole. When the two scraper parts are configured to snap together, the two fixing holes are connected. The base body is provided with a seat hole corresponding to the fixing hole. The seat hole and the two fixing holes are used for the fastener to pass through so as to fix the scraper on the base body.

[0016] The beneficial effects of the embodiments of this utility model are as follows: In this invention, when the packaging material surface has raised dots, the packaging material passes through the second roller seam formed by the rubber roller and the smooth roller. At this time, the equipment adjusts the screen roller to rotate counterclockwise, the rubber roller to rotate clockwise, and the smooth roller to rotate counterclockwise, while the scraper moves to the screen roller's discharge side. After the screen roller is coated with dye, the scraper removes excess dye, and then the screen roller rolls against the rubber roller, transferring the halftone pattern to the rubber roller's surface. The rubber roller continues to rotate to the second roller seam position, where, under the pressure of the smooth roller, the rubber roller transfers the halftone pattern onto the packaging material. This process, through the intermediate transfer action of the rubber roller, avoids interference from raised dots on direct printing. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model, the accompanying drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are merely some exemplary embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the content of the exemplary embodiments of this utility model and these drawings without any creative effort.

[0018] Figure 1 This is a schematic diagram of the overall structure of a dual-purpose screen roller flexographic coating and dyeing machine in one embodiment of the present invention; Figure 2for Figure 1 The embodiment is shown in the structural diagram of the scraper, lifting drive assembly, platform, base and moving drive assembly; Figure 3 for Figure 1 The embodiment shows a schematic diagram of the separation structure of the scraper (only one scraper part is shown) from the lifting drive assembly and the base; Figure 4 for Figure 1 The schematic diagram shows the positional structure of the screen roller, rubber roller, and smooth roller in the embodiment.

[0019] In the diagram: 100, frame; 110, mesh roller; 111, feed side; 112, discharge side; 120, rubber roller; 130, smooth roller; 140, first roller seam; 150, second roller seam; 160, platform; 170, base; 171, seat hole; 200, scraper; 210, scraper part; 220, snap-fit ​​block; 221, fixing hole; 230, snap-fit ​​groove; 300, moving drive assembly; 310, lead screw; 320, drive motor; 400, lifting drive assembly; 500, fastener. Detailed Implementation

[0020] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit its scope.

[0021] To keep the drawings concise, only the parts relevant to the utility model are shown schematically in each drawing; these do not represent the actual structure of the product. Furthermore, for ease of understanding, in some drawings, only one of the components with the same structure or function is schematically shown, or only one is labeled. In this document, "a" not only means "only one," but can also mean "more than one," and "several" includes "two" and "more than two."

[0022] In this document, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0023] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0024] In the description of this embodiment, terms such as "upper," "lower," "left," and "right" are based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of description and simplification of operation, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0025] Furthermore, in the description of this application, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0026] like Figures 1-4 As shown, this is an embodiment of the flexographic coating and dyeing dual-purpose machine with an anilox roller 110, a device used in the traditional packaging printing field for coating and dyeing processes, mainly suitable for surface anilox printing of various packaging materials. It integrates working components such as the anilox roller 110 and the rubber roller 120. The anilox roller 110, also known as an anilox roller, has regularly distributed anilox grooves on its surface, used to store and quantitatively transfer printing dyes (such as inks and coatings). Its function is consistent with that of the halftone roller in traditional flexographic printing. The specifications of the anilox grooves determine the dye carrying capacity and printing accuracy. The rubber roller 120 is a roller body made of rubber or other flexible materials. Through its own elastic deformation, it evenly transmits pressure to the contact surface, mainly playing the role of pressurization and ink transfer. Its surface flexibility can adapt to a certain degree of unevenness in the material surface. The anilox roller 110 and the rubber roller 120 are rotatably mounted on the frame 100 via bearing seats, with the rubber roller 120 located directly above the anilox roller 110. A first roller pressure slit 140 is formed between the anilox roller 110 and the rubber roller 120. A smooth roller 130 is also installed directly above the rubber roller 120. The smooth roller 130 is also rotatably mounted on the frame 100 via a bearing seat, forming a second roller pressure gap 150 with the rubber roller 120. The smooth roller 130 is a rigid roller with a smooth, non-textured surface, primarily serving to apply pressure and level the surface. During printing, it works in conjunction with the rubber roller 120 to create stable pressure, ensuring uniform adhesion of dye to the material surface. Specifically, the transfer of the printing medium to the packaging material is achieved through the cooperation between the rollers. That is, the textured roller 110 carries the printing dye, and the textured pattern is transferred to the surface of the packaging material through roller pressure. This meets the processing needs of packaging materials with different surface conditions and has wide applicability in the printing production of materials such as plastic film and paper packaging.

[0027] In this embodiment, the screen roller 110, rubber roller 120 and smooth roller 130 are all driven independently, and their rotation direction can be adjusted according to processing requirements. The scraper 200 is mounted on the drive end of the lifting drive assembly 400 through the base 170. The lifting drive assembly 400 is fixed on the platform 160 that can move along the frame 100. The moving drive assembly 300 consists of a lead screw 310 and a drive motor 320. The lead screw 310 is threadedly connected to the threaded through hole of the platform 160. The horizontal position of the scraper 200 is adjusted by driving the lead screw 310 to rotate through the motor.

[0028] The scraper 200 consists of two symmetrically arranged scraper parts 210 connected by a snap-fit ​​mechanism: each scraper part 210 has a stepped snap-fit ​​groove 230 and a snap-fit ​​block 220, and the two scraper parts 210 are assembled by the cooperation of the snap-fit ​​block 220 and the snap-fit ​​groove 230. After assembly, the scraper 200 is fixed to the base 170 by fasteners 500. The fasteners 500 pass through the fixing holes 221 of the scraper parts 210 and form a rigid connection with the seat holes 171 of the base 170, which facilitates replacement and maintenance.

[0029] Specifically, the printing process for materials with smooth surfaces is as follows: When the surface of the packaging material is detected to be flat (the detection method can be visual observation or the use of relevant detection equipment, which is not limited here), the packaging material passes through the first roller pressure seam 140 formed by the screen roller 110 and the rubber roller 120. During operation, taking the screen roller 110 rotating clockwise and adhering to dye as an example, the anilox grooves on its surface are used to store a fixed amount of dye; the doctor blade 200 is set on the feed side 111 of the screen roller 110. When the screen roller 110 rotates to the position of the doctor blade 200, the doctor blade 200 scrapes off the excess dye outside the anilox grooves to ensure uniform dye distribution. The rubber roller 120 rotates counterclockwise and presses the packaging material against the surface of the screen roller 110. The dye in the anilox grooves is directly transferred to the surface of the packaging material by the pressure between the rollers, thus completing the printing.

[0030] The printing process for materials with raised dots on the surface is as follows: When the packaging material has raised dots on its surface, the material passes through the second roller gap 150 formed by the rubber roller 120 and the smooth roller 130. At this time, the equipment adjusts the rotation of the screen roller 110 counterclockwise, the rubber roller 120 clockwise, and the smooth roller 130 counterclockwise, while the doctor blade 200 moves to the discharge side 112 of the screen roller 110. After the screen roller 110 is coated with dye, the doctor blade 200 removes excess dye, and then it rolls against the rubber roller 120, transferring the halftone pattern to its surface. The rubber roller 120 continues to rotate to the second roller gap 150 position, where, under the pressure of the smooth roller 130, it transfers the halftone pattern onto the packaging material. This process, through the intermediate transfer action of the rubber roller 120, avoids interference from raised dots on direct printing.

[0031] Furthermore, in traditional screen roller printing equipment, the position of the squeegee 200 is mostly fixed, corresponding only to a single printing method. If it is necessary to adapt to the printing of packaging materials with different requirements, it is necessary to stop the machine to replace the position of the squeegee 200 or increase the number of squeegees 200. In this embodiment, when processing flat packaging materials, the scraper 200 can be moved to the feed side 111 of the screen roller 110. At this time, the screen roller 110 rotates clockwise, and the dye first adheres to the surface of the screen roller 110. The scraper 200 on the feed side 111 can scrape off the excess dye outside the anilox groove before the screen roller 110 contacts the material, avoiding excess dye contaminating the material or causing printing plate smearing. When processing materials with raised dots, the screen roller 110 switches to counterclockwise rotation. If the scraper 200 is still on the feed side 111, the reverse rotation of the screen roller 110 will cause the ink scraping direction to conflict with the dye adhesion direction. At this time, the scraper 200 can be moved to the discharge side 112 of the screen roller 110. After the screen roller 110 completes dye adhesion and before contacting the rubber roller 120, the excess dye is scraped off to ensure the amount of dye in the anilox groove is stable.

[0032] In this embodiment, after the doctor blade 200 moves to the feed side 111 or the discharge side 112, the contact gap with the screen roller 110 can be finely adjusted by the lifting component. For example, when processing flat materials of different thicknesses, it is necessary to finely adjust the pressure between the screen roller 110 and the rubber roller 120. At this time, the doctor blade 200 can be raised and lowered to adjust the ink scraping gap, so as to avoid fluctuations in the amount of dye adhesion caused by changes in material thickness. For another example, if the surface of the screen roller 110 is slightly worn after long-term use, the doctor blade 200 can be raised and lowered to compensate for the wear, so as to ensure that the ink scraping effect always meets the standard.

[0033] Furthermore, the doctor blade 210 has a locking groove 230 and a locking block 220, which are arranged in a stepped manner at different heights. The locking block 220 of one doctor blade 210 is used to engage with the locking groove 230 of another doctor blade 210. The stepped locking structure can form a stable surface contact, and the two doctor blades 210 are tightly connected after engagement. Under force, they are not easily misaligned laterally or separated longitudinally, ensuring that the doctor blade 200 maintains overall stability when scraping excess dye from the screen roller 110, and avoiding uneven ink scraping due to loose splicing.

[0034] Furthermore, the connecting fixing hole 221 in the snap-fit ​​state corresponds to the seat hole 171 of the base 170. When the fastener 500 passes through, it can ensure accurate installation position by means of the pre-positioning of the snap-fit ​​structure, and further strengthen the splicing firmness of the two doctor blade parts 210 through rigid connection. At the same time, it can stably fix the entire doctor blade 200 on the base 170, preventing the doctor blade 200 from loosening or shifting due to vibration or force during ink scraping. In addition, no additional hole calibration is required during installation, simplifying the operation process. During later maintenance, the doctor blade part 210 can be separated by simply removing the fastener 500, which makes it easy to replace worn parts individually. It takes into account connection reliability, installation convenience and maintenance efficiency.

[0035] It should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of the technical solution of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A web roll flexographic coater dyeing dual purpose machine, characterized in that, include: Frame (100); The mesh roller (110) is rotatably mounted on the frame (100); A rubber roller (120) is rotatably mounted on the frame (100) and located above the mesh roller (110). A first roller press seam (140) is formed between the rubber roller (120) and the mesh roller (110) for the smooth surface of the packaging material to pass through. A smooth roller (130) is rotatably mounted on the frame (100) and located above the rubber roller (120). A second roller press seam (150) is formed between the smooth roller (130) and the rubber roller (120) for the passage of packaging material with raised dots on its surface. In this process, a flat packaging material passes through a first roller slit (140), where a rubber roller (120) presses the packaging material against a screen roller (110) so that the screen pattern on the screen roller (110) is directly printed onto the packaging material passing through the first roller slit (140). A packaging material with raised dots passes through a second roller slit (150), where the rubber roller (120) rolls into contact with the screen roller (110) located below, so that the screen pattern is printed onto the surface of the rubber roller (120), and the rubber roller (120) transfers the screen pattern to the packaging material passing through the second roller slit (150).

2. The web roll flexographic coater dyeing dual purpose machine as claimed in claim 1, wherein, The rubber roller (120) is located directly above the mesh roller (110), and the smooth roller (130) is located directly above the rubber roller (120).

3. The web roll flexographic coater dyeing dual purpose machine as claimed in claim 2, wherein, Also includes: A scraper (200) is mounted on the frame (100) and located on the feed side (111) or discharge side (112) of the screen roller (110). The scraper (200) is used to scrape off excess pigment from the surface of the screen roller (110).

4. The dual-purpose machine for flexographic coating and dyeing according to claim 3, characterized in that, The scraper (200) is movable and liftable on the frame (100), and can be moved and lifted to be located on the feed side (111) or the discharge side (112); the flexographic coating and dyeing machine also includes: A mobile drive assembly (300) is disposed on the frame (100) for driving the scraper (200) to move; A lifting drive assembly (400) is disposed on the frame (100) for driving the scraper (200) to lift.

5. The web roll flexographic coater dyeing dual purpose machine as claimed in claim 4, wherein, Also includes: The platform (160) is movably mounted on the frame (100) and is used to support the lifting drive assembly (400); A base (170) is disposed at the drive end of the lifting drive assembly (400), and the base (170) is used to support the scraper (200).

6. The web roll flexographic coater dyeing dual purpose machine as claimed in claim 5, wherein, The mobile drive component (300) includes: The lead screw (310) is rotatably mounted on the frame (100) and threadedly connected to the threaded through hole provided in the platform (160); A drive motor (320) is mounted on the frame (100) and is used to drive the lead screw (310) to rotate.

7. The web roll flexographic coater dyeing dual purpose machine as claimed in claim 6, wherein, The scraper (200) has two symmetrically arranged scraper portions (210). The scraper (200) is configured such that when it is located on the feed side (111), one of the scraper portions (210) is used to scrape the screen roller (110), and when it is located on the discharge side (112), the other scraper portion (210) is used to scrape the surface of the screen roller (110).

8. The web roll flexographic coater dyeing dual purpose machine as claimed in claim 7, wherein, The two scraper sections (210) are snapped together.

9. The web roll flexographic coater dyeing dual purpose machine as claimed in claim 8, wherein, The scraper part (210) has a snap-fit ​​groove (230) and a snap-fit ​​block (220). The snap-fit ​​groove (230) and the snap-fit ​​block (220) are arranged in a stepped manner at different heights. The snap-fit ​​block (220) of one scraper part (210) is used to snap-fit ​​with the snap-fit ​​groove (230) of another scraper part (210).

10. The web roll flexographic coater dyeing dual purpose machine as claimed in claim 9, wherein, The snap-fit ​​block (220) is provided with a fixing hole (221). When the two scraper parts (210) are configured to snap together, the two fixing holes (221) are connected. The base (170) is provided with a seat hole (171) corresponding to the fixing hole (221). The seat hole (171) and the two fixing holes (221) are used for fasteners (500) to pass through, so as to fix the scraper (200) on the base (170).

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