Printing machine for preventing pattern from sticking

Abstract

The utility model discloses a printing machine that prevents pattern reverse sticking, by setting first drying assembly in the winding component's winding material input end pertinence, utilize the drying gap formed between drying oven and guide roller box to provide stable drying channel for winding material, heat treatment is carried out to the airflow of inlet air of drying oven internal heat exchange pipe combination, again through the air outlet hole of drying oven facing guide roller box one side array arrangement, the high temperature airflow after heating is directional and blows to the printing surface of winding material, forms accurate and efficient drying structure. The structure design makes printing pattern before entering the winding component can obtain sufficient and comprehensive drying, makes the ink or slurry on the pattern surface reach complete dry state quickly, eliminates the reverse sticking hidden danger of adjacent winding material layer because of pattern not dry from the root, guarantees the integrity and printing precision of printing pattern, avoids the product scrappage because of reverse sticking, improves product quality, reduces unnecessary production loss, reduces production cost.

Description

Technical Field

[0001] This utility model relates to the field of printing machine technology, and in particular to a printing machine that prevents patterns from sticking back. Background Technology

[0002] In the field of roll-to-roll (PVC film, PVC mats, etc.) printing, printing machines typically consist of an unwinding assembly, a printing assembly, and a rewinding assembly arranged sequentially along the roll's direction. Their working principle involves continuous feeding of the roll material via the unwinding assembly, printing of a preset pattern on the roll surface by the printing assembly, and finally, the rewinding assembly rewinding the roll to complete the printing process. To prevent blurring and sticking of printed patterns due to undried ink, existing printing machines generally include a drying structure at the output end of the printing assembly to dry the freshly printed pattern. However, in scenarios with high-speed roll-to-roll processing, the ink or paste on the surface of the printed pattern may not be completely dry in a short time after only one drying cycle. When these incompletely dried rolls enter the rewinding assembly, the printed patterns between adjacent roll layers are prone to back-sticking due to contact. This not only leads to pattern damage and blurring, affecting the product's appearance quality and printing accuracy, but may also cause the roll to be scrapped, increasing production losses and costs.

[0003] It is evident that existing technologies still need improvement and enhancement. Utility Model Content

[0004] In view of the shortcomings of the prior art, the purpose of this utility model is to provide a printing machine that prevents the pattern from sticking back, and to solve the technical problem that the printed pattern between adjacent roll layers sticks back when the roll is rewound because the printed pattern is not completely dried.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A printing machine for preventing pattern back-sticking includes an unwinding assembly, a printing assembly, and a winding assembly arranged sequentially along the roll material direction, wherein a first drying assembly is provided at the roll material input end of the winding assembly. The first drying assembly includes a drying chamber and a guide roller box arranged opposite each other. A drying gap is provided between the drying chamber and the guide roller box for the roll material to pass through. An air inlet is provided on the top of the drying chamber, and several air outlets are arranged in an array on one side of the drying chamber facing the guide roller box. A heat exchange tube is provided inside the drying chamber. The heat exchange tube is used to heat the low-temperature airflow entering the drying chamber from the air inlet into a high-temperature airflow. The air outlets are used to allow the high-temperature airflow in the drying chamber to be blown out to the printing surface of the roll material, so as to achieve rapid drying of the printed pattern on the roll material before winding, thereby avoiding the pattern from sticking back during winding.

[0006] The printing machine for preventing pattern re-adhesion is provided with at least one roller on each of the two outer walls of the drying chamber along its length.

[0007] The printing machine for preventing pattern back-sticking includes a winding assembly comprising a first connecting plate and two first side plates. The two first side plates are fixedly connected to both ends of the first connecting plate along its length. The guide roller box is fixedly connected to the opposite sides of the two first side plates along its length. The opposite sides of the two first side plates are each provided with a first guide groove. The rollers of the drying box are adapted to and rotatably accommodated in the first guide groove to realize the movable connection between the drying box and the guide roller box.

[0008] The printing machine for preventing pattern back-sticking includes a positioning rod protruding from each of the four corners of the side wall of the guide roller box facing the drying box. The end face of the positioning rod away from the guide roller box abuts against the outer side wall of the drying box. Through the limiting support of the positioning rod, a drying gap is formed between the drying box and the guide roller box for the roll material to pass through.

[0009] The printing machine for preventing pattern back-sticking further includes a first limiting component, which includes a locking screw and a locking nut. The locking screw is screwed to the locking nut, and the locking nut is fixedly installed on the top of the first guide rail groove. The vertical distance from the locking nut to the side of the guide roller box facing the drying box is equal to the sum of the length of the positioning rod and the thickness of the drying box. When the outer side of the locking screw abuts against the side of the drying box away from the guide roller box, the side of the drying box facing the guide roller box abuts against the end face of the positioning rod.

[0010] The printing machine for preventing pattern back-sticking includes a second drying component at the roll output end of the printing component. The structure of the second drying component is the same as that of the first drying component. The second drying component is used to perform preliminary drying on the printed roll pattern, and works in conjunction with the first drying component to form a dual drying effect.

[0011] The printing machine for preventing pattern back-sticking includes a printing assembly comprising a second connecting plate and two second side plates. The two second side plates are fixedly connected to both ends of the second connecting plate along its length. The guide roller box of the second drying assembly is fixedly connected to the opposite sides of the two second side plates along its length. The opposite sides of the two second side plates are each provided with a second guide groove. The rollers of the drying box of the second drying assembly are adapted to and rotatably accommodated in the second guide groove, thereby realizing the movable connection between the drying box and the guide roller box of the second drying assembly.

[0012] The printing machine for preventing pattern re-adhesion further includes a second limiting component, the structure of which is the same as that of the first limiting component, and is correspondingly installed on the top of the second guide rail groove.

[0013] Beneficial effects: This invention provides a printing machine that prevents pattern back-sticking. Its core lies in a first drying component strategically placed at the roll material input end of the take-up assembly. The drying gap between the drying chamber and the guide roller box provides a stable drying channel for the roll material. Combined with heat exchange tubes inside the drying chamber heating the airflow introduced through the inlet, the heated high-temperature airflow is then directionally blown onto the printing surface of the roll material through air outlets arrayed on one side of the guide roller box, forming a precise and efficient drying structure. This structural design ensures that the printed pattern is fully and comprehensively dried before entering the take-up assembly, allowing the ink or paste on the pattern surface to quickly reach a completely dry state. This eliminates the risk of back-sticking between adjacent roll material layers due to undried patterns, effectively ensuring the integrity and printing accuracy of the printed pattern, avoiding product scrap caused by back-sticking, improving the stability of product quality during production, reducing unnecessary production losses, lowering production costs, and better meeting the performance and product quality requirements of actual production. Attached Figure Description

[0014] Figure 1 A cross-sectional structural diagram of the printing machine provided by this utility model; Figure 2 A three-dimensional structural diagram of the printing machine provided by this utility model; Figure 3 A three-dimensional structural diagram of the winding assembly provided by this utility model; Figure 4 A three-dimensional structural diagram of the printing component provided by this utility model; Figure 5 A three-dimensional structural diagram of the drying component provided by this utility model; Figure 6 This is a cross-sectional structural diagram of the drying oven provided by this utility model.

[0015] Figure label: 1—Unwinding assembly; 2—Printing assembly; 3—Rewinding assembly 4—First drying component; 5—First limiting component; 6—Second drying component 7—Second limit component; 8—Roll material; 9—Main frame 21—Second connecting plate; 22—Second side plate; 31—First connecting plate 32—First side plate; 41—Drying box; 42—Guide roller box 43—Drying gap; 44—Heat exchange tube; 45—Filter screen 51—Locking screw 52—Locking nut 221—Second guide rail groove 321—First guide rail groove; 411—Air inlet; 412—Air outlet 413—Roller; 421—Positioning rod; 422—Guide roller. Detailed Implementation

[0016] This utility model provides a printing machine for preventing pattern re-adhesion. To make the purpose, technical solution, and effects of this utility model clearer and more explicit, the following describes this utility model in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this utility model and are not intended to limit this utility model.

[0017] In the description of this utility model, it should be understood that the terms "upper," "lower," "left," and "right," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or a specific orientational structure and operation. Therefore, they should not be construed as limitations on this utility model. Furthermore, "first" and "second" are only for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "multiple" means two or more.

[0018] Please see Figures 1 to 2 As shown, this utility model provides a printing machine for preventing pattern back-sticking, comprising an unwinding assembly 1, a printing assembly 2, and a winding assembly 3 arranged sequentially along the direction of the roll material 8. A first drying assembly 4 is provided at the input end of the roll material 8 of the winding assembly 3. In this embodiment, the printing machine includes a main frame 9, with the unwinding assembly 1, printing assembly 2, and winding assembly 3 arranged along the length of the main frame 9. A plurality of traction rollers are arranged on the main frame 9 along its length. The structures of the unwinding assembly 1 and the winding assembly 3 are existing structures, and the core printing components of the printing assembly 2 and their installation relationship are also existing technologies.

[0019] The roll material 8 to be processed enters the printing assembly 2 from the unwinding assembly 1 via the traction roller for printing. The printed roll material 8 then enters the second drying assembly 6 for preliminary drying, and then enters the first drying assembly 4 via the traction roller for further drying. Finally, it is collected into a roll by the rewinding assembly 3. This structural design ensures that the printed pattern is fully and comprehensively dried before entering the rewinding assembly 3, allowing the ink or paste on the pattern surface to quickly reach a completely dry state. This eliminates the risk of back-sticking between adjacent roll material layers due to undried patterns, effectively ensuring the integrity and printing accuracy of the printed pattern, avoiding product scrap caused by back-sticking, improving the stability of product quality during the production process, reducing unnecessary production losses, lowering production costs, and better meeting the actual production requirements for the performance and product quality of the printing machine.

[0020] Please see Figures 5 to 6 As shown, the first drying assembly 4 includes a drying chamber 41 and a guide roller box 42 arranged opposite to each other. A drying gap 43 is provided between the drying chamber 41 and the guide roller box 42 for the roll material 8 to pass through. An air inlet 411 is provided on the top of the drying chamber 41. A plurality of air outlets 412 are arranged in an array on the side of the drying chamber 41 facing the guide roller box 42. A heat exchange tube 44 is provided inside the drying chamber 41. The heat exchange tube 44 is used to heat the low-temperature airflow entering the drying chamber 41 through the air inlet 411 into a high-temperature airflow. The air outlets 412 are used to allow the high-temperature airflow in the drying chamber 41 to be blown out to the printing surface of the roll material 8, so as to achieve rapid drying of the printed pattern of the roll material 8 before winding, thereby avoiding the pattern from sticking back when winding.

[0021] In this embodiment, the air inlet 411 of the drying chamber 41 can be connected to an air supply pipe and a blower (not shown in the figure) is connected through the air supply pipe; a filter screen 45 is installed inside the drying chamber 41, and the filter screen 45 is located between the steam outlet and the heat exchange tube 44; the two ends of the heat exchange tube 44 are respectively connected to the output end and the input end of an external heat exchanger, thereby forming a circulation loop of the heat exchange medium. The guide roller box 42 is open on the side facing the drying chamber 41, and multiple guide rollers 422 with parallel axes are rotatably arranged inside the guide roller box 42 from top to bottom. The highest point of the outer peripheral guide surface of the guide roller 422 protrudes out of the opening and is used to roll against the back of the roll material 8. The blower sends outside air into the inner cavity of the drying chamber 41 through the air supply pipe and the air inlet 411. The air first flows over the outer surface of the heat exchange tube 44, carrying away the heat from the outer surface of the heat exchange tube 44 to form a high-temperature airflow. The high-temperature airflow is then filtered through the filter screen 45 and finally blown onto the printing surface of the roll material 8 to dry the ink or paste of the printed pattern. The filter screen 45 can prevent the high-temperature airflow from carrying impurities and contaminating the surface of the roll material 8, thereby affecting the printing quality.

[0022] Please see Figure 5As shown, at least one roller 413 is provided on the outer walls of both ends of the drying box 41 along its length. In this embodiment, four rollers 413 are provided on the outer walls of both ends of the drying box 41, and the four rollers 413 are arranged in pairs at the upper and lower ends of the drying box 41 to maintain the stability of the drying box 41 during installation and movement.

[0023] Please see Figure 3 As shown, the winding assembly 3 includes a first connecting plate 31 and two first side plates 32. The two first side plates 32 are respectively fixedly connected to both ends of the first connecting plate 31 along its length. The guide roller box 42 is fixedly connected to the opposite sides of the two first side plates 32 along its length. Each of the two first side plates 32 has a first guide groove 321 on its opposite sides. The rollers 413 of the drying box 41 are adapted to and rotatably accommodated in the first guide groove 321 to realize the movable connection between the drying box 41 and the guide roller box 42. In this embodiment, the first guide groove 321 is a "C" shaped groove. Each first side plate 32 is equipped with two first guide grooves 321. The two first guide grooves 321 are welded and fixed to the outer side of the first side plate 32 from top to bottom. Two rollers 413 are movably accommodated in each first guide groove 321 to ensure the stable installation and movement of the drying box 41.

[0024] When the end of the roll 8 is placed into the drying gap 43, the drying box 41 needs to be moved away from the guide roller box 42 along the first guide groove 321 so that the drying gap 43 is large enough; after the end of the roll 8 has completely passed through the drying gap 43, the drying box 41 needs to be moved closer to the guide roller box 42 along the first guide groove 321 so that the drying gap 43 returns to the optimal distance during the drying process.

[0025] Please see Figure 5 As shown, a positioning rod 421 protrudes from each of the four corners of the side wall of the guide roller box 42 facing the drying chamber 41. The end face of the positioning rod 421 away from the guide roller box 42 abuts against the outer side wall of the drying chamber 41. Through the limiting support of the positioning rod 421, a drying gap 43 is formed between the drying chamber 41 and the guide roller box 42 for the roll material 8 to pass through. In this embodiment, the length of the positioning rod 421 is greater than the thickness of a single sheet of the roll material 8 and greater than the height of the outer peripheral surface of the guide roller 422 protruding from the opening of the guide roller box 42, thereby preventing the drying chamber 41 from contacting the printing surface of the roll material 8 and thus scratching the printed pattern on the surface of the roll material 8.

[0026] To improve the production environment, an exhaust port (not shown in the figure) is provided on the back or top of the guide roller box 42. The exhaust port is connected to an exhaust pipe, which is connected to an exhaust fan. The exhaust fan is connected to an external waste gas treatment system (such as an RTO regenerative thermal combustion device) to treat the waste generated by the printing pattern of the drying roll material 8.

[0027] Please see Figures 3 to 4As shown, it also includes a first limiting component 5, which includes a locking screw 51 and a locking nut 52. The locking screw 51 is screwed to the locking nut 52, and the locking nut 52 is fixedly installed on the top of the first guide rail groove 321. The vertical distance from the locking nut 52 to the side of the guide roller box 42 facing the drying box 41 is equal to the sum of the length of the positioning rod 421 and the thickness of the drying box 41. When the outer side of the locking screw 51 abuts against the side of the drying box 41 away from the guide roller box 42, the side of the drying box 41 facing the guide roller box 42 is exactly in contact with the end face of the positioning rod 421. In this embodiment, the axis of the locking nut 52 is perpendicular to the length direction of the first guide rail groove 321, and the locking nut 52 is fixed to the top of the first guide rail groove 321 by welding. One end of the locking screw 51 is provided with an anti-slip handle, and the other end is screwed to the locking nut 52. When the locking screw 51 passes through the locking nut 52, its outer side abuts against the side of the drying box 41 away from the guide roller box 42, thereby limiting and locking the drying box 41 to prevent it from moving during the drying process and affecting the drying effect and printing quality.

[0028] Please see Figure 1 and Figure 4 As shown, a second drying component 6 is provided at the output end of the roll material 8 of the printing component 2. The structure of the second drying component 6 is the same as that of the first drying component 4. The second drying component 6 is used to perform preliminary drying of the printed pattern on the roll material 8, and works with the first drying component 4 to form a dual drying effect. When the roll material 8, carrying the freshly printed wet pattern, enters the drying gap 43 of the second drying component 6, the heat exchange tube 44 rapidly heats the airflow introduced through the air inlet 411 to form a high-temperature airflow with a certain temperature. This airflow is then evenly blown onto the printing surface of the roll material 8 through the array of air outlets 412. By utilizing the heat transfer and water vapor evaporation of the high-temperature airflow, the ink or paste on the pattern surface is preliminarily dried, quickly removing most of the moisture or solvent, so that the pattern is preliminarily solidified and formed. This prevents the roll material 8 from experiencing localized flow, blurring, or slight adhesion to the transport structure during the process of being transferred from the printing component 2 to the winding component 3 due to the unformed pattern.

[0029] Please see Figure 4As shown, the printing assembly 2 includes a second connecting plate 21 and two second side plates 22. The two second side plates 22 are fixedly connected to both ends of the second connecting plate 21 along its length. The guide roller box 42 of the second drying assembly 6 is fixedly connected to the opposite sides of the two second side plates 22 along its length. Each of the two side plates 22 has a second guide groove 221 on its opposite sides. The rollers 413 of the drying chamber 41 of the second drying assembly 6 are adapted to and rotatably accommodated within the second guide groove 221, thus achieving a movable connection between the drying chamber 41 and the guide roller box 42 of the second drying assembly 6. In this embodiment, the second guide groove 221 and the first guide groove 321 are identical in number and structure to ensure the installation and operational stability of the second drying assembly 6. The core printing components of the printing assembly 2, such as the printing plate roller, the printing substrate roller, and the ink cartridge, are all installed between the two second side plates 22.

[0030] Please see Figure 4 As shown, it also includes a second limiting component 7, which has the same structure as the first limiting component 5 and is installed on the top of the second guide rail groove 221. The second limiting component 7 is used to limit and lock the drying chamber 41 of the second drying component 6 to ensure that the second drying component 6 can operate normally and stably.

[0031] It is understood that those skilled in the art can make equivalent substitutions or changes based on the technical solution and inventive concept of this utility model, and all such substitutions or changes should fall within the protection scope of the appended claims of this utility model.

Claims

1. A printing machine for preventing pattern re-adhesion, characterized in that, It includes an unwinding assembly (1), a printing assembly (2) and a winding assembly (3) arranged sequentially along the roll (8), and a first drying assembly (4) is provided at the roll (8) input end of the winding assembly (3). The first drying assembly (4) includes a drying box (41) and a guide roller box (42) arranged opposite to each other. A drying gap (43) is provided between the drying box (41) and the guide roller box (42) for the roll material (8) to pass through. An air inlet (411) is provided on the top of the drying box (41). Several air outlets (412) are arranged in an array on one side of the drying box (41) facing the guide roller box (42). A heat exchange tube (44) is provided inside the drying box (41). The heat exchange tube (44) is used to heat the low-temperature airflow entering the drying box (41) from the air inlet (411) into a high-temperature airflow. The air outlets (412) are used to blow the high-temperature airflow in the drying box (41) to the printing surface of the roll material (8) so as to achieve rapid drying of the printed pattern of the roll material (8) before winding, thereby avoiding the pattern from sticking back when winding.

2. The printing machine for preventing pattern re-adhesion according to claim 1, characterized in that, The drying oven (41) has at least one roller (413) on each of its two outer walls along its length.

3. The printing machine for preventing pattern re-adhesion according to claim 2, characterized in that, The winding assembly (3) includes a first connecting plate (31) and two first side plates (32). The two first side plates (32) are fixedly connected to the two ends of the first connecting plate (31) along its length. The two ends of the guide roller box (42) along its length are fixedly connected to the opposite sides of the two first side plates (32). The opposite sides of the two first side plates (32) are provided with first guide grooves (321). The rollers (413) of the drying box (41) are adapted and rolled in the first guide grooves (321) to realize the movable connection between the drying box (41) and the guide roller box (42).

4. The printing machine for preventing pattern re-adhesion according to claim 3, characterized in that, A positioning rod (421) is provided at each of the four corners of the side wall of the guide roller box (42) facing the drying box (41). The end face of the positioning rod (421) away from the guide roller box (42) abuts against the outer side wall of the drying box (41). Through the limiting support of the positioning rod (421), a drying gap (43) is formed between the drying box (41) and the guide roller box (42) for the roll material (8) to pass through.

5. The printing machine for preventing pattern re-adhesion according to claim 3, characterized in that, It also includes a first limiting component (5), which includes a locking screw (51) and a locking nut (52). The locking screw (51) is screwed to the locking nut (52), and the locking nut (52) is fixedly installed on the top of the first guide rail groove (321). The vertical distance from the locking nut (52) to the side of the guide roller box (42) facing the drying box (41) is equal to the sum of the length of the positioning rod (421) and the thickness of the drying box (41). When the outer side of the locking screw (51) abuts against the side of the drying box (41) away from the guide roller box (42), the side of the drying box (41) facing the guide roller box (42) just abuts against the end face of the positioning rod (421).

6. The printing machine for preventing pattern re-adhesion according to claim 4 or 5, characterized in that, The output end of the roll (8) of the printing component (2) is provided with a second drying component (6). The structure of the second drying component (6) is the same as that of the first drying component (4). The second drying component (6) is used to perform preliminary drying on the printed pattern of the roll (8) after printing, and works with the first drying component (4) to form a double drying effect.

7. The printing machine for preventing pattern re-adhesion according to claim 6, characterized in that, The printing assembly (2) includes a second connecting plate (21) and two second side plates (22). The two second side plates (22) are fixedly connected to the two ends of the second connecting plate (21) along its length. The guide roller box (42) of the second drying assembly (6) is fixedly connected to the opposite sides of the two second side plates (22) along its length. The two sides of the two second side plates (22) that are away from each other are provided with second guide rail grooves (221). The rollers (413) of the drying box (41) of the second drying assembly (6) are adapted and rolled in the second guide rail grooves (221) to realize the movable connection between the drying box (41) of the second drying assembly (6) and the guide roller box (42).

8. The printing machine for preventing pattern re-adhesion according to claim 7, characterized in that, It also includes a second limiting component (7), which has the same structure as the first limiting component (5) and is installed on the top of the second guide rail groove (221).

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