Roll printing equipment

Abstract

The utility model discloses roll printing equipment which comprises a roll device, a plurality of traction devices, a printing device and a storage device. The multiple traction devices comprise the first traction device located at the last position and the second traction device located at the last but one position in the multiple traction devices in the conveying direction. The printing device is used for conducting common image-text printing on the holographic material passing through the multiple traction devices and comprises a first detection assembly, the first detection assembly is used for obtaining the deviation amount of a common image-text printing position, and the first traction device can adjust the traction speed of the holographic material according to the deviation amount. The deviation of the common image-text printing position is adjusted; the storage device is arranged between the second traction device and the first traction device in the conveying direction, and the storage device can store holographic materials or release the stored holographic materials to stabilize tension fluctuation. According to the roll printing equipment, the overprinting precision of common images and texts can be improved, and the production efficiency is improved.

Description

Technical Field

[0001] The utility model relates to printing equipment, in particular to a roll printing equipment for holographic materials. Background Art

[0002] In recent years, holographic positioning printing products, combining decorative and anti-counterfeiting properties, have been enthusiastically sought after by the market. This technology involves coordinating the layout of holographic images with conventional printed images during the design phase. The holographic image is then initially processed in a fixed position on the holographic molded product, such as holographic positioning film, holographic positioning composite paper, or holographic positioning transfer paper. Next, using traditional printing processes such as offset, flexographic, gravure, silk screen, and letterpress, the traditional printed image and the pre-created holographic positioning image are overprinted, resulting in a comprehensive product that combines the rich colors of traditional printing with the sparkling effect of the holographic image. However, currently, holographic positioning printing products are primarily produced using a single sheet of holographic positioning paper on sheet-fed printing equipment, which limits production efficiency and overprint accuracy. Utility Model Content

[0003] The present invention aims to solve at least one of the technical problems in the prior art. To this end, the present invention provides a roll printing device that can improve the overprint accuracy of ordinary graphics and texts and increase production efficiency.

[0004] The present invention further provides a roll printing device, the roll printing device comprising:

[0005] A reel device for unwinding holographic materials;

[0006] A plurality of traction devices are sequentially arranged along the conveying direction of the holographic material, the traction devices are used to pull the holographic material, and the plurality of traction devices include a first traction device at the last position among the plurality of traction devices along the conveying direction and a second traction device at the second to last position;

[0007] a printing device for performing ordinary graphic printing on the holographic material passing through the plurality of traction devices, the printing device comprising a first detection component for obtaining a deviation of a position of ordinary graphic printing, the first traction device being capable of adjusting a traction speed of the holographic material according to the deviation to adjust the deviation of the position of ordinary graphic printing;

[0008] A material storage device is provided between the second traction device and the first traction device along a conveying direction, and the material storage device can store holographic materials or release stored holographic materials to smooth tension fluctuations.

[0009] In some embodiments, the plurality of traction devices include a third traction device located at a first position among the plurality of traction devices along the conveying direction;

[0010] The web printing device includes a first tension sensor, which is arranged between the third traction device and the second traction device. The first tension sensor is used to obtain a tension signal of the holographic material between the third traction device and the second traction device. The third traction device can adjust the traction speed of the holographic material according to the tension signal.

[0011] In some embodiments, the web printing apparatus includes a deflection correction device and a second detection component, wherein the second detection component and the deflection correction device are both arranged between the third traction device and the second traction device along the conveying direction, the second detection component is used to obtain lateral offset information of the holographic material, and the deflection correction device adjusts the lateral position of the holographic material according to the lateral offset information.

[0012] In some embodiments, the roll printing device includes a second tension sensor, which is arranged between the roll device and the third traction device along the conveying direction. The second tension sensor is used to detect the tension signal of the holographic material between the roll device and the third traction device. The roll device can adjust the speed of unwinding the holographic material according to the tension signal.

[0013] In some embodiments, the web printing apparatus includes a floating roller assembly, which is disposed between the web device and the third traction device along a conveying direction, and is configured to smooth tension fluctuations by releasing or receiving the holographic material.

[0014] In some embodiments, the web printing apparatus includes a splicing station, which is disposed between the web device and the third traction device along a conveying direction, and is used to connect an end of one holographic material with a beginning of another holographic material.

[0015] In some embodiments, the roll printing apparatus includes a recurving device, which is arranged between the roll device and the third traction device along the conveying direction. The recurving device has a top wheel, which presses against the holographic material in the opposite direction of the bending direction of the holographic material to perform reverse correction on the curl of the holographic material.

[0016] In some embodiments, the roll printing apparatus includes a double-sided dust removal device, which is arranged between the roll device and the third traction device along the conveying direction. The double-sided dust removal device has negative pressure ports aligned with two opposite sides in the thickness direction of the holographic material, and the negative pressure ports are used to provide negative pressure to absorb debris from two opposite sides in the thickness direction of the holographic material.

[0017] In some embodiments, the web printing apparatus includes a corona device, which is disposed between the web device and the third traction device along a conveying direction, and is capable of performing corona treatment on at least one side of the holographic material in a thickness direction.

[0018] In some embodiments, the traction device includes a traction active roller and a pressure roller. The traction active roller and the pressure roller can be clamped on the holographic material. The traction active roller can adjust its own rotation speed to adjust the traction speed of the holographic material.

[0019] The web printing device according to the embodiment of the present invention has at least the following beneficial effects:

[0020] A reel unwinds the holographic material, and multiple traction devices pull the holographic material along the conveying direction. The printing device then prints conventional graphics on the holographic material that has passed through the multiple traction devices. This improves printing efficiency by eliminating the need to print conventional graphics on individual sheets. A first detection component detects the deviation of the conventional graphics printing position. The first traction device adjusts the traction speed of the holographic material based on the deviation to adjust the deviation. Adjusting the traction speed causes the tension of the holographic material between the first and second traction devices to change, thereby affecting the actual adjustment effect of the deviation. By providing a storage device between the second and first traction devices, the storage device can adjust the length of the stored holographic material based on tension changes, thereby stabilizing the tension and preventing such tension changes from affecting the actual adjustment effect of the deviation, thereby improving the overprint accuracy of the conventional graphics.

[0021] Additional aspects and advantages of the present invention will be given in part in the following description and will become apparent from the following description or learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein:

[0023] Figure 1 A schematic diagram of a holographic material and a slitting machine in the prior art;

[0024] Figure 2 A schematic diagram of a cut single holographic material in the prior art;

[0025] Figure 3 A schematic diagram of a printing positioning structure for a single holographic material in the prior art;

[0026] Figure 4 A schematic diagram of a holographic material after ordinary graphic printing in the prior art;

[0027] Figure 5This is a schematic structural diagram of a web printing device according to an embodiment of the present invention;

[0028] Figure 6 This is a holographic material in the embodiment of the present invention that is not printed with ordinary graphics or text.

[0029] Reference numerals:

[0030] 10. Reel device; 20. Traction device; 21. First traction device; 22. Second traction device; 23. Third traction device; 30. Printing device; 31. First detection component; 40. Storage device; 50. First tension sensor; 60. Correction device; 70. Second detection component; 81. Floating roller assembly; 82. Material receiving table; 83. Anti-bending device; 84. Double-sided dust removal device; 85. Corona device; 86. Loading landing gear; 87. Mounting frame; e3-2. Holographic positioning mark; e3-3. Tracking line. DETAILED DESCRIPTION

[0031] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0032] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the present invention.

[0033] In the description of this utility model, "several" means more than one, "plurality" means more than two, "greater than," "less than," and "exceed" are understood to exclude the number itself, while "above," "below," and "within" are understood to include the number itself. The use of the terms "first" and "second" is solely for the purpose of distinguishing technical features and is not to be construed as indicating or implying relative importance, implicitly specifying the number of the indicated technical features, or implicitly specifying the order of the indicated technical features.

[0034] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, and connecting should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0035] In the description of the present invention, reference to terms such as "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the exemplary expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0036] The existing holographic positioning printing process adopts a sheet-fed printing method, and the holographic positioning printing material is processed into a single sheet of positioning material, such as Figure 1 As shown, a positioning holographic pattern is pre-made on the holographic material a1, a2 is the holographic positioning edge line on the holographic material, and the upper and lower trimming knives a5 and a4 on the slitting machine cut off the reserved waste edge a8 along the outer edge of the positioning line a2, while a3 is the horizontal cutting line of the holographic roll material, and the upper and lower cutting knives a6 and a7 on the slitting machine accurately cut out a single holographic material along the edge of a3.

[0037] like Figure 2 The figure shows a cut single sheet of holographic material. b1 is the front edge for single-sheet printing, b2 is the side edge for single-sheet printing, b3 is the holographic pattern, and b4 is the holographic text. The holographic patterns b3 and b4 have a defined positional relationship with the front edge b1 and the side edge b2. Therefore, this material is called a holographic positioning printing material, or simply a holographic material.

[0038] The material can be plastic sheets, composite paper and transfer paper suitable for single-sheet printing, but single-sheet printing equipment cannot print film products. Figure 3 As shown, the front guides c5 and c6 of the sheet-fed printing press position the front positioning edge c3 of the holographic positioning material, while the side guides c4 position the side positioning edge c2 on the holographic material to ensure that the ordinary graphics and ink maintain the set positional relationship with the holographic graphics in the material during the printing process. The printed product is as follows: Figure 4 As shown in the figure, the holographic image and ordinary image in the holographic positioning material are printed on the same page, maintaining a predetermined positional relationship with each other. This is the single-sheet printing process of holographic positioning material. The holographic material will produce a slitting error during the slitting process, and another printing positioning error during the single-sheet printing process. Therefore, the printing positioning accuracy of the holographic image is not high. In addition, the single-sheet printing process cannot print thin-film holographic positioning materials, and the efficiency of single-sheet printing is also low. Therefore, it is necessary to develop a holographic positioning printing process on roll-to-roll printing equipment to improve the positioning accuracy and production efficiency of holographic positioning printing.

[0039] Please refer to Figure 5 An embodiment of the present application provides a roll printing device, which includes a roll device 10, a plurality of traction devices 20, a storage device 40 and a printing device 30.

[0040] The reel device 10 is used to unwind the holographic material. It will be appreciated that the reel device 10 includes a reel on which the holographic material is wound. During the unwinding process, the reel rotates to release the holographic material. Holographic material herein refers to material with holographic printed images. Holographic materials include films pre-fabricated with holographic positioning images, such as OPP, PET, PVC, and PI. Holographic positioning laminating paper and transfer paper are also included.

[0041] Multiple traction devices 20 are arranged in sequence along the conveying direction of the holographic material. The traction devices 20 are used to pull the holographic material, allowing the holographic material to move along the conveying direction. The presence of multiple traction devices 20 can reduce the pulling force of a single traction device on the holographic material, thereby reducing deformation and improving movement accuracy.

[0042] The plurality of traction devices 20 include a first traction device 21 at the last position in the conveying direction and a second traction device 22 at the second to last position. The holographic material passes through the second traction device 22 and the first traction device 21 in sequence in the conveying direction.

[0043] The printing device 30 is used to perform ordinary graphic printing on the holographic material that has passed through multiple traction devices. In other words, after the holographic material passes through the first traction device 21, it enters the printing device 30 for ordinary graphic printing.

[0044] The printing device 30 includes a first detection component 31 for obtaining the deviation of the ordinary graphic printing position. The first traction device 21 can adjust the traction speed of the holographic material according to the deviation to adjust the deviation of the ordinary graphic printing position.

[0045] It should be noted that when the first traction device 21 adjusts the traction speed of the holographic material, the tension of the holographic material between the second traction device 22 and the first traction device 21 will change, and the above change will affect the deviation of the ordinary graphic printing position.

[0046] The storage device 40 is disposed between the second traction device 22 and the first traction device 21 along the conveying direction. The storage device 40 can store the holographic material or release the stored holographic material to smooth out tension fluctuations.

[0047] In the above embodiment, the reel device 10 unwinds the holographic material, multiple traction devices 20 pull the holographic material along the conveying direction, and the printing device 30 performs conventional image printing on the holographic material that has passed through the multiple traction devices. This improves printing efficiency by eliminating the need to print the conventional image on a single sheet. A first detection assembly 31 is used to detect the deviation of the conventional image printing position. The first traction device 21 can adjust the holographic material pulling speed based on the deviation to adjust the deviation. Adjusting the pulling speed causes the tension of the holographic material between the first traction device 21 and the second traction device 22 to change, thereby affecting the actual adjustment effect of the deviation. By providing a storage device 40 between the second traction device 22 and the first traction device 21, the storage device 40 can adjust the length of the stored holographic material based on tension changes, thereby stabilizing the tension and preventing tension changes from affecting the actual adjustment effect of the deviation, thereby improving the overprint accuracy of the conventional image.

[0048] It is understood that there is no limit to the number of printing devices 30. In some embodiments, the number of printing devices is three.

[0049] It is understandable that the structure of the traction device 20 is not limited.

[0050] In some embodiments, the traction device 20 includes a traction active roller and a pressure roller. The traction active roller and the pressure roller can be clamped on the holographic material. The traction active roller can adjust its own rotation speed to adjust the traction speed of the holographic material.

[0051] The active traction roller and pressure roller are clamped on the holographic material, preventing tension fluctuations on one side of the traction device 20 from being transmitted to the other side. This prevents fluctuations in the holographic material unwinding from the reel device 10 from being transmitted to the printing device 30, thereby improving the positioning accuracy of conventional graphic printing. Furthermore, multiple traction devices 20 form multi-level isolation, enhancing the isolation effect and further ensuring the positioning accuracy between conventional graphic printing and holographic printing.

[0052] In order to improve the precision, the traction active roller is connected with the servo motor.

[0053] In some embodiments, the first detection component 31 is an electric eye. The holographic material has a common graphic printing positioning mark and a holographic graphic positioning mark. The holographic graphic positioning mark is located on the holographic material of the reel device 10. Please refer to Figure 6 The figure shows the unfolded holographic material, where e3-2 is the holographic image positioning mark, and the conventional image printing color mark is printed by the printing device 30. The first detection component 31 detects the change in the distance between the conventional image printing positioning mark and the holographic image positioning mark. The control system processes this and sends an execution signal to the first pulling device 21 to adjust the deviation of the conventional image printing position.

[0054] In some embodiments, the plurality of traction devices 20 include a third traction device 23 located at the first position along the conveying direction among the plurality of traction devices 20. In other words, the holographic material unwound from the reel device 10 passes through the third traction device 23, the second traction device 22, and the first traction device 21 in sequence.

[0055] The web printing device includes a first tension sensor 50, which is arranged between the third traction device 23 and the second traction device 22. The first tension sensor 50 is used to obtain a tension signal of the holographic material between the third traction device 23 and the second traction device 22. The third traction device 23 can adjust the traction speed of the holographic material according to the tension signal.

[0056] It is understood that the third traction device 23 can isolate the tension fluctuations on the third traction device 23 and the reel device 10, thereby preventing such fluctuations from affecting the holographic material between the third traction device 23 and the second traction device 22. Furthermore, the first tension sensor 50, in conjunction with the third traction device 23, can adjust the holographic material pulling speed to stabilize the tension. It is understood that the first traction device 21, the second traction device 22, and the third traction device 23 divide the holographic material into multiple tension control zones along the conveying direction, thereby achieving multi-level tension control and improving the positioning accuracy of the holographic material within the printing device 30.

[0057] In some embodiments, the web printing apparatus includes a deflection correction device 60 and a second detection assembly 70. The second detection assembly 70 and the deflection correction device 60 are both arranged between the third traction device 23 and the second traction device 22 along the conveying direction. The second detection assembly 70 is used to obtain lateral offset information of the holographic material, and the deflection correction device 60 adjusts the lateral position of the holographic material according to the lateral offset information.

[0058] It is understood that the transverse direction is perpendicular to the conveying direction and perpendicular to the thickness direction of the holographic material. Specifically, the transverse direction is the width direction of the holographic material.

[0059] The second detection component 70 can be an electric eye. Figure 6 The figure shows an unfolded holographic material, where e3-3 is the tracking line. The tracking line extends continuously along the length of the holographic material. The second detection assembly 70 detects the lateral offset of the tracking line on the holographic material. The correction device 60 adjusts the lateral position of the holographic material based on the lateral offset information.

[0060] In some embodiments, the roll printing apparatus includes a second tension sensor, which is disposed between the roll device 10 and the third traction device 23 along the conveying direction. The second tension sensor is used to detect a tension signal of the holographic material between the roll device 10 and the third traction device 23. The roll device 10 can adjust the speed of unwinding the holographic material according to the tension signal.

[0061] The reel device 10 includes a servo motor and a magnetic powder brake, and the tension signal of the holographic material between the reel device 10 and the third traction device 23 is transmitted to the servo motor and the magnetic powder brake.

[0062] It is understandable that the servo motor drives the reel to release the holographic material. Since the diameter of the holographic material on the reel changes during the release process, the speed of the servo motor needs to be adjusted accordingly. By setting up a second tension sensor, the speed of unwinding the holographic material can be further adjusted according to the tension change.

[0063] In some embodiments, the web printing apparatus includes a loading undercarriage 86 and a mounting frame 87. The web assembly 10 is mounted on the mounting frame 87. The loading undercarriage 86 is capable of raising and lowering the mounting frame 87 and the web assembly 10. Specifically, the mounting frame 87 can be lowered to facilitate loading during loading. After loading is complete, the mounting frame 87 is raised to allow the web assembly 10 to be raised into a working position.

[0064] In some embodiments, the web printing apparatus includes a floating roller assembly 81, which is disposed between the web device 10 and the third traction device 23 along the conveying direction. The floating roller assembly 81 is configured to smooth tension fluctuations by releasing or storing holographic materials, thereby reducing tension fluctuations caused when the web device 10 adjusts the speed of unwinding the holographic materials.

[0065] The floating roller assembly 81 includes at least one floating roller, which can rise and fall according to the change of tension, thereby releasing or storing the holographic material.

[0066] The specific structure of the storage device 40 is not limited. In some embodiments, the storage device 40 includes a plurality of upper rollers and a plurality of lower rollers, with a gap between the lower rollers and the upper rollers. The holographic material passes through the upper and lower rollers in sequence, so that the holographic material is stored between the upper and lower rollers. When the tension changes, the lower rollers are raised or lowered, and the gap between the upper and lower rollers changes, thereby releasing or storing some of the holographic material.

[0067] In some embodiments, the web-to-web printing apparatus includes a splicing station 82, which is positioned along the conveying direction between the web assembly 10 and the third traction assembly 23. The splicing station 82 is used to connect the end of one holographic material to the beginning of another. It is understood that when a roll of holographic material is printed and a new roll is needed, the end of the new roll of holographic material is connected to the previous roll at the splicing station 82.

[0068] In some embodiments, the web printing apparatus includes a recurving device 83, which is disposed between the web device 10 and the third traction device 23 along the conveying direction. The recurving device 83 has a top wheel, which presses against the holographic material in the opposite direction of the bending direction of the holographic material to perform reverse correction on the curl of the holographic material.

[0069] It can be understood that the holographic material is wound on the reel device 10, so the holographic material is in a curled state, especially for the core portion, since its bending radius is smaller, the curling degree is more serious.

[0070] By providing the recurving device 83, the top wheel of the recurving device 83 presses against the holographic material in the opposite direction of the holographic material's curvature, causing the holographic material to deform in the opposite direction, thereby correcting the curl of the holographic material in the opposite direction. This ensures that the subsequent movement and printing process remain stable and smooth.

[0071] In some embodiments, the inflection device 83 is disposed downstream of the receiving platform 82 along the conveying direction.

[0072] In some embodiments, the web-to-web printing apparatus includes a double-sided dust removal device 84, which is positioned between the web assembly 10 and the third traction device 23 along the conveying direction. The double-sided dust removal device 84 has negative pressure ports aligned with two opposing sides of the holographic material in the thickness direction. The negative pressure ports are used to provide negative pressure to remove debris from the opposing sides of the holographic material in the thickness direction. The negative pressure suction removes dust and other contaminants from the holographic material, ensuring a clean surface for subsequent printing and improving print quality.

[0073] In some embodiments, the web-to-web printing apparatus includes a corona device 85, which is disposed between the web device 10 and the third traction device 23 along the conveying direction. The corona device 85 is capable of performing a corona treatment on at least one side of the holographic material in the thickness direction. In other words, the corona device 85 can perform a corona treatment on one side or both sides of the holographic material in the thickness direction to improve the adhesion of subsequent printing ink or the composite fastness of the laminated product.

[0074] Among them, along the conveying direction, the double-sided dust removal device 84 and the corona device 85 can be arranged in sequence.

[0075] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Various modifications can be made within the scope of knowledge possessed by a person skilled in the art without departing from the spirit of the present invention. In addition, the embodiments of the present invention and the features of the embodiments can be combined with each other unless there is a conflict.

Claims

1. Web printing equipment, characterized in that The web printing equipment comprises: A reel device for unwinding holographic materials; A plurality of traction devices are sequentially arranged along the conveying direction of the holographic material, the traction devices are used to pull the holographic material, and the plurality of traction devices include a first traction device at the last position among the plurality of traction devices along the conveying direction and a second traction device at the second to last position; a printing device for performing ordinary graphic printing on the holographic material passing through the plurality of traction devices, the printing device comprising a first detection component for obtaining a deviation of a position of ordinary graphic printing, the first traction device being capable of adjusting a traction speed of the holographic material according to the deviation to adjust the deviation of the position of ordinary graphic printing; A material storage device is provided between the second traction device and the first traction device along a conveying direction, and the material storage device can store holographic materials or release stored holographic materials to smooth tension fluctuations.

2. The web printing apparatus according to claim 1, wherein: The plurality of traction devices include a third traction device located at a first position among the plurality of traction devices along the conveying direction; The web printing device includes a first tension sensor, which is arranged between the third traction device and the second traction device. The first tension sensor is used to obtain a tension signal of the holographic material between the third traction device and the second traction device. The third traction device can adjust the traction speed of the holographic material according to the tension signal.

3. The web printing apparatus according to claim 2, wherein: The web printing apparatus includes a deflection correction device and a second detection component. The second detection component and the deflection correction device are both arranged between the third traction device and the second traction device along the conveying direction. The second detection component is used to obtain lateral offset information of the holographic material. The deflection correction device adjusts the lateral position of the holographic material according to the lateral offset information.

4. The web printing apparatus according to claim 2, wherein: The roll printing device includes a second tension sensor, which is arranged between the roll device and the third traction device along the conveying direction. The second tension sensor is used to detect the tension signal of the holographic material between the roll device and the third traction device. The roll device can adjust the speed of unwinding the holographic material according to the tension signal.

5. The web printing apparatus according to claim 4, wherein: The web printing apparatus includes a floating roller assembly, which is arranged between the web device and the third traction device along a conveying direction. The floating roller assembly is used to smooth tension fluctuations by releasing or storing holographic materials.

6. The web printing apparatus according to any one of claims 2 to 5, characterized in that: The web printing device includes a splicing platform, which is arranged between the web device and the third traction device along the conveying direction. The splicing platform is used to connect the end of one holographic material with the beginning of another holographic material.

7. The web printing apparatus according to any one of claims 2 to 5, characterized in that: The web printing apparatus includes a recurving device, which is arranged between the web device and the third traction device along the conveying direction. The recurving device has a top wheel, which presses against the holographic material in the opposite direction of the bending direction of the holographic material to perform reverse correction on the curl of the holographic material.

8. The web printing apparatus according to any one of claims 2 to 5, characterized in that: The roll printing equipment includes a double-sided dust removal device, which is arranged between the roll device and the third traction device along the conveying direction. The double-sided dust removal device has negative pressure ports aligned with two opposite sides in the thickness direction of the holographic material. The negative pressure ports are used to provide negative pressure to absorb debris on two opposite sides in the thickness direction of the holographic material.

9. The web printing apparatus according to any one of claims 2 to 5, characterized in that: The web printing apparatus comprises a corona device, which is arranged between the web device and the third traction device along the conveying direction. The corona device can perform corona treatment on at least one side of the holographic material in the thickness direction.

10. The web printing apparatus according to any one of claims 1 to 5, characterized in that: The traction devices each include a traction active roller and a pressure roller. The traction active roller and the pressure roller can be clamped on the holographic material. The traction active roller can adjust its own rotation speed to adjust the traction speed of the holographic material.

Images