Flexographic printing device for raw paper of paper cup

Abstract

The invention provides a flexographic printing device for raw paper of paper cups, and belongs to the technical field of printing devices.The flexographic printing device comprises a printing machine and a printing winding frame, the printing winding frame is connected with a winding roller and a rotating shaft, the side wall of the printing winding frame is fixedly connected with a fixing plate, and the printing machine is located on one side of the printing winding frame; the removing assembly is used for protecting raw paper of the paper cup; the heating roller has the beneficial effects that comprehensive and uniform heating of the heating roller is achieved through cooperation of the reflection cylinder and the reflection cover, and lamination layer softening or ink discoloration caused by local overheating of body paper is avoided; and the flexible protection design of the silica gel cylinder effectively prevents the printing surface of the body paper from being scratched and the lamination layer from being damaged, the spiral vent groove efficiently discharges water vapor and hot air, the problem of anti-sticking between ink layers is solved, meanwhile, the friction resistance is reduced, the winding tension is stabilized, and the flatness of a paper roll is improved. And real-time static conduction and discharge in the whole contact process of the raw paper and the silica gel cylinder are realized through the static elimination system, so that the static elimination rate is improved.

Description

Technical Field

[0001] This invention relates to the field of printing apparatus technology, and more specifically, to a flexographic printing apparatus for paper cup base paper. Background Technology

[0002] Various printing and other processing machinery and equipment, designed to meet and exceed the production targets of manufacturers, are constantly emerging in the market at an unprecedented pace. Modern printing presses generally consist of an unwinding unit, a printing unit, and a rewinding unit. Their working principle is as follows: first, the text and images to be printed are made into a printing plate, which is then mounted on the printing press. Ink is then applied manually or by the printing press to the areas on the printing plate containing the text and images, and then directly or indirectly transferred to paper or other substrates (such as textiles, metal plates, plastics, leather, wood, glass, and ceramics), thus reproducing a printed product identical to the printing plate.

[0003] Static electricity generation is a common phenomenon in the paper cup base paper winding process. Its generation mechanism is mainly based on the triboelectric effect. When two materials come into contact with each other and are quickly separated, the material with a strong ability to attract electrons will transfer electrons to its surface. The surface of the material that gains electrons becomes negatively charged, while the surface of the other material becomes positively charged due to the loss of electrons. In the printing process, the affinity of materials such as paper, plastic, ink, and printing plate to electrons varies. Under the action of great pressure and high speed, they come into close contact and are quickly separated, which fully meets the conditions for the generation of static electricity.

[0004] However, static electricity has multifaceted effects on the winding process, and its harmful effects are cascading, severely restricting product quality and production efficiency. First, during high-speed winding of the paper cup base paper, the static charge generated by friction with equipment components creates a stable electric field on the paper surface, leading to strong adsorption or repulsion forces between the paper sheets. This results in uneven feeding resistance and fluctuating transmission speed. Repulsion causes the paper edges to curl and flutter, failing to adhere smoothly to the winding roller, which in turn causes lateral shift or longitudinal stretching deformation of the printed image, affecting the integrity and aesthetics of the printed pattern, and significantly increasing the scrap rate in mass production. Second, during the winding process, the accumulation of static electricity creates a continuous electrostatic adsorption force between the layers of the paper roll. This adsorption force can cause the wound paper to... Difficulty in unwinding the roll leads to easy tearing, uneven edges, and other defects in subsequent slitting processes, increasing slitting losses. For paper cup base paper requiring secondary processing (such as die-cutting and forming), interlayer adhesion can cause paper conveying jams during feeding, affecting the accuracy and efficiency of paper cup forming, and in severe cases, causing equipment shutdown. In addition, when the take-up roller is in direct contact with the base paper, if the roller surface is not smooth enough or has impurities attached, it can easily scratch the printing surface or coating of the base paper, damaging the integrity of the pattern. For coated paper cup base paper, it may also scratch the coating layer, leading to a decrease in the water resistance of the paper cup and affecting product quality. How to invent a flexographic printing device for paper cup base paper to solve these problems has become an urgent problem for those skilled in the art. Summary of the Invention

[0005] To overcome the above deficiencies, the present invention provides a flexographic printing apparatus for paper cup base paper, which aims to solve the problem that static electricity can cause paper to attract or repel each other, resulting in unstable paper feeding, which in turn causes the printed image to shift or deform, seriously affecting the printing quality; secondly, during the winding process, static electricity accumulation can also cause the paper layers to stick together.

[0006] This invention is implemented as follows: This invention provides a flexographic printing apparatus for paper cup base paper, including a printing press and a printing rewinding rack. The printing rewinding rack is connected to a rewinding roller and a rotating shaft. A fixing plate is fixedly connected to the side wall of the printing rewinding rack. The printing press is located on one side of the printing rewinding rack. The apparatus also includes: A removal component, which is connected to a rotating shaft, is used to protect the paper cup base paper.

[0007] Preferably, the printing rewinding frame is rotatably connected to the rewinding roller and the rotating shaft, and the rotating shaft is rotatably connected to the fixed plate.

[0008] Preferably, the removal assembly includes a heating roller, which is fixedly connected to the outer wall of the rotating shaft. The heating roller has a reflective cylinder inside, which is sleeved on the outer wall of the rotating shaft. The reflective cylinder is arranged in a polygonal prism shape.

[0009] Preferably, a reflector is fixedly connected to each end of the reflector cylinder, the reflector is concave, and a plurality of electrically heated tubes arranged in a circumferential array are fixedly connected to the side wall of the reflector.

[0010] Preferably, a heat-conducting cylinder is fixedly connected to the outer wall of the heating roller, a silicone cylinder is provided on the outer side of the heat-conducting cylinder, and a conductive cylinder is fixedly connected between the heat-conducting cylinder and the silicone cylinder.

[0011] Preferably, the outer wall of the silicone tube has a plurality of circumferentially arranged ventilation grooves, which are spirally arranged.

[0012] Preferably, the side wall of the heating roller is provided with a placement groove, the placement groove is arranged in a ring, the inner wall of the placement groove is fixedly connected to a current collector ring, and the current collector ring is slidably connected to an absorption ring.

[0013] Preferably, a wire is fixedly connected to the side wall of the absorption ring, and a connecting plate is fixedly connected to the side wall of the absorption ring. The end of the connecting plate away from the absorption ring is fixedly connected to a corresponding fixing plate.

[0014] Preferably, the inner wall of the placement groove is provided with a plurality of protective grooves arranged in a circumferential array, and the interior of the protective groove is provided with a conductive rod.

[0015] Preferably, the conductive rod is L-shaped, with one end of the conductive rod fixedly connected to the current collector ring, and the other end of the conductive rod passing through the silicone tube and fixedly connected to the conductive tube.

[0016] The beneficial effects of this invention are: 1. This invention utilizes a combination of a multi-faceted prism-shaped reflector and a concave reflector inside the heating roller to significantly improve the heat utilization rate of the electric heating tube, achieving uniform temperature throughout the circumference of the heating roller and preventing softening of the coating layer or discoloration of the ink caused by localized overheating of the base paper. The high thermal conductivity and non-conductive properties of the heat-conducting cylinder ensure efficient heat transfer to promote ink curing while also achieving electrical isolation, ensuring that static electricity is conducted only through the conductive cylinder, preventing static electricity diversion or loss. Furthermore, the flexible protective design of the silicone cylinder effectively prevents scratches on the printed surface of the base paper and damage to the coating layer. The spiral ventilation groove efficiently discharges moisture and hot air, solving the problem of interlayer sticking caused by ink that is not fully dried on the surface. At the same time, it reduces frictional resistance, stabilizes winding tension, and improves the flatness of the paper roll.

[0017] 2. The electrostatic elimination system of this invention utilizes a closed-loop conduction path consisting of a silicone tube, a conductive tube, a conductive rod, a collecting ring, an absorption ring, a wire, and ground. Combined with the sliding contact design of the collecting ring and the absorption ring, it achieves real-time electrostatic discharge throughout the entire contact process between the base paper and the silicone tube, improving the electrostatic elimination rate. This design not only avoids problems such as paper adsorption and dust contamination caused by static electricity but also works synergistically with the ventilation groove to prevent dust from clogging the channel, further ensuring winding quality. Furthermore, the overall structure significantly reduces the surface defect rate during base paper winding, effectively improving the adaptability of the paper roll for subsequent processing, especially suitable for coated paper cup base paper. It also boasts advantages such as low energy consumption, convenient maintenance, and wide adaptability. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the overall structure of a flexographic printing apparatus for paper cup base paper provided in an embodiment of the present invention; Figure 2 This is a schematic diagram of the printing rewinding frame structure of a flexographic printing apparatus for paper cup base paper provided in an embodiment of the present invention; Figure 3 This is a schematic diagram of the removal component structure of a flexographic printing apparatus for paper cup base paper provided in an embodiment of the present invention; Figure 4 This is a schematic diagram of the internal structure of the heating roller of a flexographic printing apparatus for paper cup base paper provided in an embodiment of the present invention; Figure 5 This is a partial cross-sectional view of the heating roller structure of a flexographic printing apparatus for paper cup base paper provided in an embodiment of the present invention; Figure 6 This invention provides a flexographic printing apparatus for paper cup base paper. Figure 5 Enlarged schematic diagram of the structure at point A in the middle; Figure 7 This is a schematic diagram of the half-section structure of the heating roller of a flexographic printing apparatus for paper cup base paper provided in an embodiment of the present invention.

[0020] In the diagram: 1. Printing press; 2. Printing take-up rack; 3. Removal assembly; 31. Silicone tube; 32. Ventilation slot; 33. Wire; 34. Connecting plate; 35. Heating roller; 36. Reflector; 37. Electric heating tube; 38. Reflector tube; 39. Protective slot; 310. Absorption ring; 311. Conductive tube; 312. Heat-conducting tube; 313. Conductive rod; 314. Collector ring; 315. Placement slot; 4. Take-up roller; 5. Fixing plate; 6. Shaft. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. Example 1

[0022] Reference Figures 1-7 A flexographic printing apparatus for paper cup base paper includes a printing press 1 and a printing rewinding frame 2. The printing rewinding frame 2 is connected to a rewinding roller 4 and a rotating shaft 6. A fixing plate 5 is fixedly connected to the side wall of the printing rewinding frame 2. The printing press 1 is located on one side of the printing rewinding frame 2. The apparatus also includes: Remove component 3, which is connected to the rotating shaft 6, is used to protect the paper cup base paper.

[0023] Furthermore; the printing take-up frame 2 is rotatably connected to the take-up roller 4 and the rotating shaft 6 respectively, and the rotating shaft 6 is rotatably connected to the fixed plate 5; the removal assembly 3 includes a heating roller 35, which is fixedly connected to the outer wall of the rotating shaft 6, and a reflector 38 is provided inside the heating roller 35. The reflector 38 is sleeved on the outer wall of the rotating shaft 6 and is arranged in a polygonal prism shape; a reflector 36 is fixedly connected to both ends of the reflector 38, and the reflector 36 is arranged in a concave shape. Several electrically heated tubes 37 arranged in a circumferential array are fixedly connected to the side wall of the reflector 36.

[0024] Paper transfer and heating: The printing rewinding frame 2 forms a rotational fit with the rewinding roller 4 and the rotating shaft 6 through bearings, ensuring that both can rotate flexibly around their own axes; at the same time, the two ends of the rotating shaft 6 are also rotatably connected to the fixing plate 5. The fixing plate 5 is fixed to the side wall of the printing rewinding frame 2 by bolts, which provides precise axial positioning for the rotating shaft 6 without hindering its rotational movement; the external drive motor (not marked in the figure, it is a conventional supporting component in printing equipment, so the specific transmission working principle will not be described in detail) transmits power to the rotating shaft 6 through a transmission mechanism (such as gears or belts). Since the heating roller 35 is fixedly connected to the outer wall of the rotating shaft 6 (a key connection or interference fit can be used), the rotation of the rotating shaft 6 will synchronously drive the heating roller 35 to rotate; the heating roller 35 and the rewinding roller 4 form a linkage through the friction of the paper cup paper, which ultimately drives the rewinding roller 4 to complete the paper winding action.

[0025] After the printing of the paper cups by the printing press 1 is completed, the paper cups are conveyed by the guiding mechanism to the bonding area between the heating roller 35 and the winding roller 4. Since the heating roller 35 and the winding roller 4 rotate synchronously, the paper cups are conveyed forward at a uniform speed under the clamping force and friction of the two, and at the same time, they are in full contact with the outer wall of the heating roller 35 to absorb the heat transferred by the roller.

[0026] The built-in heating system comprises a heating roller 35, a reflector 38, a reflector 36, and electric heating tubes 37. The electric heating tubes 37 (preferably infrared electric heating tubes 37) arranged in a circular array on the sidewall of the reflector 36 convert electrical energy into heat energy when energized. The generated heat diffuses outward in the form of infrared radiation and thermal conduction. The circular array layout ensures that heat is evenly distributed axially and circumferentially from the heating roller 35, avoiding the formation of localized hot spots. The reflector 36 has a concave design, and its inner wall is treated with high reflectivity (such as an aluminum coating), which reflects the heat emitted from the electric heating tubes 37 to both ends back to the central area inside the heating roller 35, reducing heat loss. Less heat dissipation towards the shaft head improves heat utilization. The reflector 38, which is fitted on the outer wall of the rotating shaft 6, is prismatic (such as hexagonal or octagonal prisms). Compared with cylindrical reflector structures, the prismatic sidewalls can form multiple reflective surfaces, reflecting the heat radiated from the electric heating tube 37 to the cylinder wall again and dispersing it evenly to the inner wall of the heating roller 35. This avoids heat concentration in a single area and achieves uniform circumferential temperature of the heating roller 35. The combination of the prismatic reflector 38 and the concave reflector 36 ensures uniform temperature of the heating roller 35 and avoids softening of the coating layer (for coated base paper) or discoloration of the ink caused by local overheating of the base paper.

[0027] The heating roller 35 is made of a metal material with high thermal conductivity (such as aluminum alloy). Its inner wall absorbs the heat directly radiated by the electric heating tube 37 and the secondary heat reflected by the reflector 38 and reflector 36, and then quickly transfers the heat to the entire roller body through heat conduction. Since the heating roller 35 rotates synchronously with the rotating shaft 6, the contact time between each part of the roller body and the heat source is uniform, and finally a uniformly heated surface is formed on the outer wall of the heating roller 35.

[0028] Reference Figures 3-5 Furthermore, a heat-conducting cylinder 312 is fixedly connected to the outer wall of the heating roller 35, and a silicone cylinder 31 is provided on the outer side of the heat-conducting cylinder 312. A conductive cylinder 311 is fixedly connected between the heat-conducting cylinder 312 and the silicone cylinder 31. Several circumferentially arrayed ventilation grooves 32 are opened on the outer wall of the silicone cylinder 31, and the ventilation grooves 32 are arranged in a spiral shape.

[0029] Heat conduction of the heat-conducting cylinder 312: The heat-conducting cylinder 312 is made of a special material with high thermal conductivity and non-conductivity (such as alumina ceramic or insulating coated aluminum alloy), and is fixedly connected to the outer wall of the heating roller 35 (preferably with interference fit or high temperature resistant bonding). Its core function is to efficiently and evenly transfer the heat generated by the heating roller 35 to the outer conductive cylinder 311, providing a stable heat source for heating the base paper and curing the ink. The heat-conducting cylinder 312 does not have electrical conductivity, which can electrically isolate the conductive cylinder 311 from the heating roller 35, the rotating shaft 6 and other metal parts, blocking the possibility of static electricity conduction to non-preset paths. This ensures that the static electricity generated by the friction between the base paper and the silicone cylinder 31 can only be directionally absorbed by the conductive cylinder 311, avoiding static electricity diversion, loss or conduction to other parts of the equipment and causing elimination failure. The high thermal conductivity material makes the heat transfer loss low, and the ring structure can further homogenize the circumferential heat of the heating roller 35, avoid the formation of local hot spots, and ensure that the surface temperature of the conductive cylinder 311 and the silicone cylinder 31 is uniform.

[0030] Electrostatic directional collection and conduction of the conductive cylinder 311: The conductive cylinder 311 is made of a highly conductive metal material (such as copper mesh, stainless steel mesh, thin copper cylinder, etc.), sandwiched between the heat-conducting cylinder 312 and the silicone cylinder 31 and tightly fitted. At the same time, it is rigidly connected to the collector ring 314 through the conductive rod 313, forming a unique electrostatic conduction path. Since the heat-conducting cylinder 312 is non-conductive, the static electricity generated by the friction between the base paper and the silicone cylinder 31 cannot be conducted inward, but can only be quickly transferred to the conductive cylinder 311 through the silicone cylinder 31. The full-circumferential wrapping design of the conductive cylinder 311 can quickly collect the static electricity dispersed in various areas of the silicone cylinder 31, ensuring concentrated conduction of static electricity. The conductive cylinder 311 also has a certain thermal conductivity, which can further transfer the heat transferred by the heat-conducting cylinder 312 to the silicone cylinder 31. This does not affect the heating efficiency, and the uniform thermal conductivity of the metal material can help improve the temperature stability of the silicone cylinder 31.

[0031] Surface protection and electrostatic conduction of silicone tube 31: Silicone tube 31 is made of food-grade flexible conductive silicone (with added carbon fiber conductive filler) that is resistant to high temperatures and directly contacts the paper cup base paper. Its flexibility can buffer tension fluctuations and instantaneous pressure impacts during the winding process, avoiding scratches on the printing surface of the base paper and damage to the coating layer caused by traditional hard roller surfaces, thus protecting the integrity of the base paper surface. The conductivity of silicone tube 31 allows the static electricity on the surface of the base paper to be quickly transferred to itself and then to the tightly fitted conductive tube 311 inside. At the same time, the antistatic properties of silicone itself can help suppress the generation of static electricity, forming a dual protection of passive antistatic and active static conductivity. Combined with the insulation of the heat-conducting tube 312, it ensures that the static electricity conduction path is unique. Silicone tube 31 has a thermal conductivity that matches the heating requirements, which can evenly transfer the heat transferred by the conductive tube 311 to the surface of the base paper, achieving flexible contact heating and avoiding warping and softening of the coating layer caused by local overheating of the base paper.

[0032] The spiral ventilation groove 32 works synergistically with the multi-layer composite structure: The spiral ventilation groove 32 forms a through airflow channel. When the heating roller 35 drives the silicone tube 31 to rotate, the "wind guiding effect" generated by the spiral structure will quickly discharge the moisture and hot air between the base paper and the silicone tube 31 along the spiral groove direction, keeping the surface of the base paper dry and ensuring complete curing of the ink. At the same time, the airflow can reduce the bonding pressure between the base paper and the silicone tube 31, further reducing the risk of adhesion. The spiral ventilation groove 32 reduces the actual contact area between the silicone tube 31 and the base paper, reducing the frictional resistance between them, avoiding stretching and deformation of the base paper due to excessive friction, and ensuring... Stable winding tension prevents longitudinal distortion of the printed pattern. The guiding nature of the spiral structure ensures smooth paper transport, preventing paper offset and edge rubbing during winding and improving the flatness of the paper roll end face. Combined with the static elimination function, it further reduces edge wear and dust adsorption. In addition, the airflow channel formed by the ventilation groove 32 can accelerate air circulation on the surface of the paper, carrying away the fine dust adsorbed by static electricity and preventing dust from adhering to the surface of the silicone tube 31 or clogging the ventilation groove 32. At the same time, the airflow helps to accelerate the dissipation of static electricity, which works synergistically with the active static dissipation function of the conductive tube 311 to further reduce the static potential on the surface of the paper and reduce the risk of contamination. Example 2

[0033] Reference Figures 5-7Furthermore, the side wall of the heating roller 35 is provided with a placement groove 315, which is arranged in a ring shape. A current collector ring 314 is fixedly connected to the inner wall of the placement groove 315, and an absorption ring 310 is slidably connected to the current collector ring 314. A wire 33 is fixedly connected to the side wall of the absorption ring 310, and a connecting plate 34 is fixedly connected to the side wall of the absorption ring 310. The end of the connecting plate 34 away from the absorption ring 310 is fixedly connected to a corresponding fixing plate 5. The inner wall of the placement groove 315 is provided with a plurality of protective grooves 39 arranged in a circumferential array. A conductive rod 313 is provided inside the protective groove 39. The conductive rod 313 is arranged in an "L" shape. One end of the conductive rod 313 is fixedly connected to the current collector ring 314, and the other end of the conductive rod 313 passes through the silicone tube 31 and is fixedly connected to the conductive tube 311.

[0034] Protection of the placement groove 315 and the protective groove 39: The annular placement groove 315 on the side wall of the heating roller 35 provides precise installation space for the collector ring 314 and the conductive rod 313. Its annular structure is coaxial with the heating roller 35, ensuring that the electrostatic conduction components do not shift axially when the heating roller 35 rotates, thus ensuring a stable conduction path. The protective grooves 39 arranged in a circular array on the inner wall of the placement groove 315 are used to accommodate the conductive rod 313, preventing the conductive rod 313 from being exposed and contaminated by ink or dust or damaged by collision. At the same time, they position the conductive rod 313, ensuring that its two ends (collector ring 314, collector ring 314, and conductor rod 313) are properly positioned. 14 and the conductive cylinder 311 are always firmly attached to each other without any interruption of conduction; while the absorption ring 310 is rigidly fixed to the fixing plate 5 through the connecting plate 34. The connecting plate 34 is made of insulating material to prevent static electricity from being conducted to the printing rewinding frame 2; the collector ring 314 is fixed to the inner wall of the placement groove 315 of the rotating heating roller 35. The two adopt a sliding conductive fit (similar to a dynamic and static friction conductive structure). This design not only ensures that the heating roller 35 can rotate freely, but also achieves continuous conductive contact between the collector ring 314 and the absorption ring 310, providing a key dynamic and static conversion interface for static electricity conduction.

[0035] The insulating function of the heat-conducting cylinder 312: The heat-conducting cylinder 312 is made of high thermal conductivity, non-conductive metal oxide ceramic or insulating coated aluminum alloy. It only undertakes the function of heat transfer and does not participate in electrostatic conduction. Its insulating properties can achieve electrical isolation between the conductive cylinder 311 and the heating roller 35, preventing static electricity from being dispersed and conducted to other components such as the rotating shaft 6 and the printing take-up frame 2 through the heating roller 35. This ensures that static electricity can only be absorbed directionally by the conductive cylinder 311, ensuring the uniqueness of the conduction path.

[0036] During the winding process of the paper cup base paper, the base paper comes into flexible contact with the silicone tube 31 and undergoes continuous friction. Since the base paper is an insulator, and the relative humidity of the air in the winding environment is usually controlled within a certain range (the low humidity environment adapted to the printing process further reduces the paper's conductivity), the large amount of static charge generated during friction cannot dissipate on its own and easily accumulates on the surface of the base paper, forming an electrostatic potential as high as several thousand volts. The silicone tube 31, made of flexible conductive silicone material with appropriately added short-cut carbon fibers, has a surface resistance controlled within a certain range and possesses excellent electrostatic conductivity. Furthermore, the silicone tube 31 and the conductive tube 311 are tightly bonded through a vulcanization bonding process, with no gaps at the contact surface. This ensures that the static charge on the surface of the base paper can be quickly transferred to the surface of the silicone tube 31 the instant it is generated, and then rapidly penetrates to the inner conductive tube 311 through molecular conduction. The conductive tube 311 is made of 80-100 mesh. The 304 stainless steel mesh material not only has high conductivity but also high-efficiency electrostatic conduction performance. Its mesh structure can also form a full-body fit with the silicone cylinder 31, while not hindering the transfer of heat from the heat-conducting cylinder 312 to the silicone cylinder 31. The key is that the heat-conducting cylinder 312, which is sandwiched between the conductive cylinder 311 and the heating roller 35, is made of alumina ceramic material and has no conductivity at all, thus forming an effective electrical isolation barrier. This completely blocks the possibility of static electricity being conducted to the heating roller 35, the rotating shaft 6, and other metal parts, avoiding static electricity diversion, loss, or accumulation in other parts of the equipment. Under this premise, the conductive cylinder 311, through its full-circumferential wrapping design, can quickly collect the static electricity dispersed in various areas of the silicone cylinder 31. Whether the static electricity is generated in the middle or at the edge of the silicone cylinder 31, it can be quickly conducted to the entire conductive cylinder 311 through the mesh structure, achieving comprehensive collection without any conduction dead zones.

[0037] In addition, to achieve directional static electricity discharge, the conductive cylinder 311 and the conductive rod 313 are fixedly connected by silver brazing. The conductive rod 313 is made of phosphor bronze alloy, and its other end is also rigidly connected to the collector ring 314 by welding, forming a rigid conduction path of conductive cylinder 311, conductive rod 313 and collector ring 314. Considering that a single conductive rod 313 may have problems such as excessive conduction load and poor contact, this device uses multiple circumferentially arrayed conductive rods 313, which can evenly distribute the static electricity collected on the conductive cylinder 311 to different areas of the collector ring 314, avoiding heating, oxidation or increased contact resistance caused by current concentration in a single conduction path, and significantly improving the static electricity conduction efficiency. In this entire conduction process, the heat-conducting cylinder 312 only undertakes the function of heat transfer. Its high thermal conductivity ensures that the heat from the heating roller 35 is efficiently transferred to the conductive cylinder 311, while not interfering with the static electricity conduction path. From a physical structure perspective, this ensures that all static electricity can be directionally introduced into the collector ring 314 through the conductive rod 313, laying the foundation for subsequent static electricity grounding elimination.

[0038] Furthermore, the collector ring 314 is fixedly connected to the inner wall of the placement groove 315 on the side wall of the heating roller 35 via an interference fit, and rotates synchronously with the heating roller 35 (the rotation speed matches the paper winding speed); while the absorber ring 310 is rigidly fixed to the fixed plate 5 via the connecting plate 34, always remaining stationary, and the two form a sliding conductive fit structure. To ensure the stability and durability of conductive contact during rotation, the contact surfaces of the collector ring 314 and the absorber ring 310 are both made of highly conductive and wear-resistant phosphor bronze alloy, and the contact surfaces are mirror-polished. At the same time, conductive grease is applied to the contact surfaces, which reduces rotational friction resistance and prevents the contact resistance from increasing due to wear and oxidation, ensuring that static electricity can be smoothly transferred from the rotating collector ring 314 to the fixed absorber ring 310, with no interruption or attenuation in the conduction process.

[0039] The sidewall of the absorption ring 310 is fixedly connected to a multi-strand copper core wire 33 by welding. The other end of the wire 33 is directly connected to the workshop's dedicated grounding system, forming the final static electricity release channel. The key is that the connection between the absorption ring 310 and the connecting plate 34 is isolated by an insulating gasket (the insulating gasket is made of polytetrafluoroethylene), and the connecting plate 34 is made of glass fiber reinforced plastic with excellent insulation properties. This completely blocks the possibility of static electricity being conducted to the main body of the equipment such as the printing rewind rack 2 and the fixing plate 5, ensuring that static electricity is released only along the preset path of the collector ring 314, the absorption ring 310, the wire 33, and the ground.

[0040] This fixed grounding design ensures that the entire grounding path is completely unaffected by the rotational motion of the heating roller 35, maintaining a stable conductive state at all times. The static charge generated by the friction of the raw paper, after being transferred to the collector ring 314, can be quickly conducted to the ground through the absorption ring 310 and the wire 33, fundamentally avoiding static accumulation. At the same time, the full circumferential design of the annular collector ring 314, combined with multiple circumferentially distributed conductive rods 313, ensures that no matter how the heating roller 35 rotates, the static electricity on the conductive cylinder 311 can be quickly transferred to the collector ring 314 through the corresponding conductive rods 313, without any conduction blind spots. The current-sharing design of multiple conductive rods 313 can also evenly distribute the static current, reducing the conduction load of a single conductive rod 313, effectively avoiding the heating and ablation problems caused by current concentration in a single conduction path, further improving the static discharge speed and the service life of the structure.

[0041] It should be noted that the specific model and specifications need to be selected and determined based on the actual specifications of the device. The specific selection and calculation method adopts the existing technology in this field, so it will not be described in detail here.

[0042] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A flexographic printing device for paper cup base paper, comprising a printing machine (1) and a printing winding frame (2), a winding roller (4) and a rotating shaft (6) are connected to the printing winding frame (2), a fixed plate (5) is fixedly connected to the side wall of the printing winding frame (2), and the printing machine (1) is located on one side of the printing winding frame (2), characterized in that, Also include: Remove the components (3), the shaft (6) connected to the removal components (3) for the protection of the paper cup paper.

2. The flexographic printing device for paper cup base paper according to claim 1, wherein, The printing roll (2) is respectively connected with the winding roll (4) and the rotating shaft (6), the rotating shaft (6) is rotatably connected between the fixed plate (5).

3. The flexographic printing device for paper cup base paper according to claim 1, wherein, The removal assembly (3) includes a heating roller (35), the heating roller (35) is fixedly connected with the outer wall of the rotating shaft (6), the inside of the heating roller (35) is provided with a reflecting cylinder (38), the reflecting cylinder (38) is sleeved on the outer wall of the rotating shaft (6), the reflecting cylinder (38) is provided in the form of a polygonal prism.

4. The flexographic printing device for paper cup base paper according to claim 3, wherein, The both ends of the reflecting cylinder (38) are respectively fixedly connected with the reflecting cover (36), the reflecting cover (36) is provided in the form of a concave, the side wall of the reflecting cover (36) is fixedly connected with a plurality of circumferentially arrayed electric heating pipes (37).

5. The flexographic printing device for paper cup base paper according to claim 4, wherein, The outer wall of the heating roller (35) is fixedly connected with a heat conducting cylinder (312), the outer side of the heat conducting cylinder (312) is provided with a silica gel cylinder (31), the heat conducting cylinder (312) and the silica gel cylinder (31) are fixedly connected with a conductive cylinder (311).

6. The flexographic printing device for paper cup base paper according to claim 5, wherein The outer wall of the silica gel cylinder (31) is provided with a plurality of circumferentially arrayed air grooves (32), the air grooves (32) are provided in the form of a spiral.

7. The flexographic printing device for paper cup base paper according to claim 6, wherein The side wall of the heating roller (35) is provided with a placing groove (315), the placing groove (315) is provided in the form of a ring, the inner wall of the placing groove (315) is fixedly connected with a current collecting ring (314), the current collecting ring (314) is slidingly connected with an absorbing ring (310).

8. The flexographic printing device for paper cup base paper according to claim 7, wherein The side wall of the absorbing ring (310) is fixedly connected with a wire (33), the side wall of the absorbing ring (310) is fixedly connected with a connecting plate (34), the end of the connecting plate (34) away from the absorbing ring (310) is fixedly connected with the corresponding fixed plate (5).

9. The flexographic printing device for paper cup base paper according to claim 8, wherein, The inner wall of the placing groove (315) is provided with a plurality of circumferentially arrayed protection grooves (39), the inside of the protection groove (39) is provided with a conductive rod (313).

10. The flexographic printing device for paper cup base paper according to claim 9, wherein, The conductive rod (313) is provided in the form of "L", one end of the conductive rod (313) is fixedly connected with the current collecting ring (314), the other end of the conductive rod (313) is fixedly connected with the conductive cylinder (311) penetrating the silica gel cylinder (31).

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