An on-line secondary coater for roll-printed printed matter

Abstract

The application discloses an online secondary coating machine for roller printing products, which comprises a rack, two coating pad rollers positioned and installed on the rack, a coating plate roller positioned and installed on the rack and adjacent to the coating pad rollers in one-to-one mode, a transition roller and a paper conveying roller positioned and installed on the rack and sequentially transmissionally connected between the two coating pad rollers, the front and back sides of the transition roller being the coating pad rollers or the paper conveying roller, the transition roller and the coating pad rollers or the paper conveying roller being transmissionally connected through bevel gears, the transition roller being internally provided with a blowing device so that the coating surface of the coated material is inward and the coating content is not in contact with the transition roller when the coated material is pulled forward, and the upper side of the paper conveying roller being provided with a hot air device for blowing hot air to the coating surface of the coated material to heat and dry the coated material. The transition roller does not contact and transfer the coated material, the online double coating is completed without leaving the machine table, the accurate gear transmission between the rollers can guarantee that the overprint position of the double coating is more accurate, the overprint position deviation caused by repeated feeding is avoided, and the efficiency is improved.

Description

Technical Field

[0001] This invention relates to coating machines, and more particularly to an online secondary coating machine for roller-printed materials. Background Technology

[0002] Existing coating machines typically only allow for one coating cycle. When a second coating is required, the first coating must be completed, dried, and the semi-finished product stacked. Then, the material is loaded onto another coating machine for a second coating, followed by drying, stacking, and finally the finished product. This coating process involves two loading and two unloading cycles, requiring intermediate transportation, resulting in inefficiency. Most importantly, the second loading cycle makes positional calibration difficult, causing misalignment between the two coating cycles and affecting the coating effect. Summary of the Invention

[0003] To address the shortcomings of existing technologies, the technical problem this invention aims to solve is to provide an online secondary coating machine for roller printing products that can continuously complete online secondary coating, thereby improving coating alignment accuracy and efficiency.

[0004] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is: an online secondary coating machine for roller printing, comprising a frame, two coating pad rollers positioned and installed on the frame, two coating plate rollers positioned and installed on the frame and adjacent to the coating pad rollers in a one-to-one reverse transmission, a transition roller and a paper transfer roller positioned and installed on the frame and sequentially connected between the two coating pad rollers, and a main drive assembly for driving the coating pad rollers to rotate. The front and rear sides of the transition roller are coating pad rollers or paper transfer rollers. The transition roller and the coating pad rollers or paper transfer rollers are driven by helical gears. The transition roller is provided with an air blowing device so that when the coating material is pulled forward, the coating surface of the coating material faces inward and the coating content does not contact the transition roller. A hot air device is provided above the paper transfer roller to blow hot air onto the coating surface of the coating material.

[0005] As an improvement to the technical solution of the online secondary coating machine for roller printing of the present invention, the air blowing device includes an air float roller with an air bladder and oblique ray air holes on its outer peripheral surface, which is disposed in the transition roller. The air bladder of the air float roller is connected to a pressure air source through a rotary joint.

[0006] As an improvement to the technical solution of the online secondary coating machine for roller printing of the present invention, the air flotation roller includes multiple air flotation tubes arranged side by side, and the air flotation tubes are arranged circumferentially or axially to form an integral cylindrical shape.

[0007] As an improvement to the technical solution of the online secondary coating machine for roller printing of the present invention, the lower side of the transition roller is provided with an air flotation tube that can blow air upwards at an angle to form an air flotation effect to support the coating material.

[0008] As an improvement to the technical solution of the online secondary coating machine for roller printing of the present invention, the hot air device includes a hot air knife chamber located above the paper conveying roller, the interior of the hot air knife chamber is equipped with an infrared heater and the bottom surface of the hot air knife chamber is provided with a slit.

[0009] As an improvement to the technical solution of the online secondary coating machine for roller printing of the present invention, the frame is provided with a box to accommodate the transition roller and the paper transfer roller, an air blowing device, a hot air device, and an exhaust port on the top of the box.

[0010] As an improvement to the technical solution of the online secondary coating machine for roller printing of the present invention, the coating plate roller and the coating pad roller rotate in opposite directions through gear transmission; the transition roller and the coating pad roller rotate in opposite directions.

[0011] As an improvement to the technical solution of the online secondary coating machine for roller printing of the present invention, a paper transfer gripper is provided between the transition roller and the coating pad roller or the paper transfer roller to transfer the coating material. The paper transfer gripper rotates synchronously with the corresponding roller and is controlled by a cam set inside the corresponding roller to open and close at a fixed point.

[0012] As an improvement to the technical solution of the online secondary coating machine for roller printing of the present invention, the main drive assembly includes a drive motor and a reduction gear set driven by the drive motor and meshing with the teeth of the primary coating pad roller.

[0013] As an improvement to the technical solution of the online secondary coating machine for roller printing of the present invention, a discharge conveyor chain is provided on the front side of the online secondary coating pad roller, and a drying device is provided on the upper side of the discharge conveyor chain.

[0014] The beneficial effects of this invention are as follows: The online secondary coating machine for roller printing is suitable for online secondary coating of paper. After the first coating is completed, the coating material is air-blown by an internal air blowing device on the transition roller, thus completing the transfer without contacting the main body of the coating material. Then, the paper transfer roller contacts and transfers the coating material against the back of the coated material, and a hot air device with heating and blowing above aligns and dries it. Then, online secondary coating can be performed directly, greatly reducing workload and improving coating efficiency. Both coating processes are completed in one go without leaving the machine. Gear transmission between the rollers ensures more accurate positioning of the two coating processes during precise material transfer, avoiding positional deviations caused by repeated feeding. Attached Figure Description

[0015] Figure 1 This is a side structural schematic diagram of an online secondary coating machine for roller printing products according to the present invention.

[0016] Figure 2 for Figure 1 The diagram shows the coating mechanism and roller drive structure in the online secondary coating machine for roller printing.

[0017] Figure 3 for Figure 1 The diagram shows the coating and paper feeding structure in an online secondary coating machine for roller printing. Detailed Implementation

[0018] The specific embodiments of the present invention will be further described below with reference to the accompanying drawings.

[0019] like Figure 1 , Figure 2 As shown, the present invention discloses an online secondary coating machine for roller printing, comprising a frame 11, two coating pad rollers 12 positioned and installed on the frame 11, two coating plate rollers 13 positioned and installed on the frame 11 and adjacent to the coating pad rollers 12 in a one-to-one reverse transmission, a transition roller 15 and a paper transfer roller 16 positioned and installed on the frame 11 and sequentially connected between the two coating pad rollers 12, and a main drive assembly 18 for driving the coating pad rollers 12 to rotate. The front and rear sides of the transition roller 15 are either the coating pad rollers 12 or the paper transfer rollers 16. The transition roller 15 is connected to the coating pad rollers 12 or the paper transfer rollers 16 by helical gear transmission. The transition roller 15 is provided with an air blowing device 51 so that when the coating material is pulled forward, the coating surface of the coating material faces inward and the coating content does not contact the transition roller 15. A hot air device 61 is provided above the paper transfer roller 16 to blow hot air onto the coating surface of the coating material. In the coating process, the coating material is transferred via an anilox roller 10. The coating plate roller 13 and the coating pad roller 12 combine to complete one coating. The coating material is then conveyed via a transition roller 15 and a transfer roller 16. During the transfer process, the transition roller 15 uses an internal air blowing device 51 to aspirate the coating material, preventing it from contacting the main body of the coating material. This aspirated material is protected against scratches during transfer. The transfer roller 16 then contacts the back of the coating material and uses a hot air device 61 above it for drying. After this, the printed material can be directly coated online for a second coating, significantly reducing workload, simplifying the material production process, and improving coating efficiency. The coating material completes two coating processes in one operation without leaving the machine. Gear transmission between the rollers, driven by the same power source, ensures accurate positioning during the precise transfer of the coating material, avoiding positional deviations caused by repeated feeding. This allows the coating to achieve sufficient thickness, improving the tactile feel of the coated product.

[0020] Typically, the coating material needs to be dried by hot air blowing from both sides of two transfer rollers 16 to achieve a better drying effect, thus not affecting the subsequent coating effect; accordingly, three spaced transition rollers 15 are needed to transfer the coating material without contacting the coating content. The coating material is usually paper.

[0021] The rollers are driven and positioned by precision helical gears, and the material is transferred and handed over in conjunction with the cooperation between the toothed cams, so that the material is transferred accurately without positional deviation and completes the online secondary coating. The two units are driven by the same power, avoiding positional changes caused by inconsistent speeds. Furthermore, the tooth handover is achieved by the main gears of the two main units being positioned in the same position to open and close the paper grippers, thereby eliminating the misregistration position of the two coatings and ensuring that the color registration position of the secondary online coating remains unchanged.

[0022] The air blowing device 51 includes an air-bearing roller 52 with an air chamber and oblique radial air holes on its outer surface, located inside the transition roller 15. The air chamber of the air-bearing roller 52 is connected to a pressure air source via a rotary joint. The air-bearing roller 52 blows out air passages 53 that are radially inclined and slightly backward. The dense arrangement of air passages 53 causes the coating material to float outward, preventing the freshly coated material from contacting the roller before it is dry, thus avoiding adhesion scratches and abrasions. This allows the coating material to be smoothly pulled forward and transferred.

[0023] Furthermore, the air flotation roller 52 includes multiple air flotation tubes arranged side by side. The air flotation tubes are arranged circumferentially or axially and form an integral cylindrical shape. The air bladder is divided and dispersed in each air flotation tube. The air flotation tubes generate the required closely spaced radial air passages to form air flotation thrust, causing the coating material to float.

[0024] More preferably, the lower side of the transition roller 15 is provided with an air flotation tube 21 that can blow air upwards at an angle to form an air flotation effect to lift the coating material. The upward air path generated by the parallel air flotation tubes 21 can form an air flotation lifting force to lift the coating material, so that the coating material is floated and clamped from both sides by the air flotation roller and the lower air flotation tube, so that the coating material can be floated and transferred, completing the non-contact transfer.

[0025] The hot air device 61 includes a hot air knife chamber 62 located above the paper transfer roller 16. The hot air knife chamber 62 contains an infrared heater, and its bottom surface has a slit 63. Hot air is blown out through the slit to form air knives (pneumatic scrapers extending axially) that blow air onto the coating material. Multiple air knives arranged side-by-side perform multiple drying operations on the coating material, resulting in better drying performance. The infrared heater, combined with the pneumatic scraper, creates a composite infrared and hot air heating system that ensures more uniform temperature and higher thermal efficiency. Two sets of UV lamps are used for curing during coating, allowing the coating to cure faster and resulting in a fuller coating and improved feel of the coated product.

[0026] The frame 11 includes a housing 19 that houses the transition roller 15, the paper transfer roller 16, the air blowing device 51, and the hot air device 61. An exhaust vent 92 is located at the top of the housing 19 to create a stable airflow inside, preventing turbulence and ensuring stable and smooth transfer of the coating material. 62

[0027] The coating plate roller 13 and the coating pad roller 12 rotate in opposite directions through gear transmission, so that their rotation is synchronized and their linear speed is the same, thereby making the coating process stable and reliable; the paper transfer roller 16 and the coating pad roller 12 rotate in the same direction, and the transition roller 15 and the coating pad roller 12 rotate in opposite directions.

[0028] Furthermore, such as Figure 3 As shown, a paper feed gripper 22 is provided between the transition roller 15 and the coating pad roller 12 or the paper feed roller 16 to transfer the coating material. The paper feed gripper 22 rotates synchronously with the corresponding roller and is controlled by a cam set inside the corresponding roller to open and close at a fixed point, so that the coating material is transferred accurately and stably, ensuring the accuracy between the positions of the two coatings and reducing the positional error between the two coatings.

[0029] Furthermore, such as Figure 2 As shown, the main drive assembly 18 includes a drive motor 81 and a reduction gear set 82 driven by the drive motor and meshing with the primary coating pad roller 12a, so as to realize the same power to drive multiple rollers, including the coating plate roller 13, the coating pad roller 12, the transmission roller 16, and the transition roller 15, all driven by the same motor, thereby achieving the synchronicity of coating of the two coating plate rollers 13.

[0030] Among them, such as Figure 1 , Figure 2 As shown, the front side of the secondary coating pad roller 12b is provided with a discharge conveyor chain 98, including a discharge roller 96. A drying device is provided on the upper side of the discharge conveyor chain 98. The coating drying method is divided into two forms: infrared heating and UV curing. One of the forms or a combination of the two forms can be used to dry and output the coating material after two coatings.

[0031] The above-disclosed embodiments are merely preferred embodiments of the present invention and should not be construed as limiting the scope of the present invention. Therefore, any equivalent variations made in accordance with the claims of the present invention are still within the scope of the present invention.

Claims

1. An on-line secondary coater for roll-printed printed matter, characterized by: The application relates to a coating machine, which comprises a rack, two coating pad rollers positioned and installed on the rack, two coating plate rollers positioned and installed on the rack and reversely driven in one-to-one connection with the coating pad rollers, a transition roller and a paper conveying roller positioned and installed on the rack and sequentially connected in driving connection between the two coating pad rollers, a main driving assembly for driving the coating pad rollers to rotate, the front and back sides of the transition roller being the coating pad rollers or the paper conveying roller, the transition roller and the coating pad rollers or the paper conveying roller being connected through bevel gear driving, the transition roller being internally provided with a blowing device so that the coating surface of the coating material faces inwards and does not contact the transition roller when the coating material is pulled forwards, the upper side of the paper conveying roller being provided with a hot air device for blowing hot air to the coating surface of the coating material; the blowing device comprises a gas floating roller cylinder provided in the transition roller and having a gas bladder and a bevel gas hole arranged on the outer circumferential surface, the gas bladder of the gas floating roller cylinder being connected with a pressure gas source through a rotary joint; the gas floating roller cylinder comprises a plurality of gas floating pipes arranged side by side, the gas floating pipes being arranged in a ring direction or an axial direction and forming an integral cylinder; the lower side of the transition roller is provided with a gas floating pipe for blowing gas upwards to form a gas floating effect to lift the coating material; a paper conveying clamp is arranged between the transition roller and the coating pad roller or the paper conveying roller to transfer the coating material, the paper conveying clamp rotates synchronously with the corresponding roller and is controlled to open and close at a fixed point by a cam arranged in the corresponding roller.

2. The roll-printed printed web on-line secondary coater of claim 1, wherein: The hot air device comprises a hot air knife chamber arranged above the paper conveying roller, the hot air knife chamber is internally provided with an infrared heater, and the bottom surface of the hot air knife chamber is provided with a slit.

3. The roll-printed printed web on-line secondary coater of claim 1, wherein: The rack is provided with a box for accommodating the transition roller and the paper conveying roller, the blowing device and the hot air device, and an air outlet is arranged on the top of the box.

4. The roll-printed printed web on-line secondary coater of claim 1, wherein: The coating plate rollers and the coating pad rollers are reversely rotated through gear driving; the transition roller and the coating pad rollers are reversely rotated.

5. The roll-printed printed web on-line secondary coater of claim 1, wherein: The main driving assembly comprises a driving motor and a speed reduction transmission wheel set driven by the driving motor and in gear engagement with the primary coating pad roller.

6. The roll-printed printed web on-line secondary coater of claim 1, wherein: The front side of the secondary coating pad roller is provided with a discharging conveying chain row, and the upper side of the discharging conveying chain row is provided with a drying device.

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