A variable information digital flexographic printing device and printing method

Abstract

The present invention belongs to the technical field of printing equipment, and provides a variable information digital flexographic printing equipment and a printing method, which are used to print predetermined images and texts on the surface of a printing material belt, wherein a material belt conveying mechanism conveys the printing material belt, a particle image and text forming mechanism generates raised particle images and texts according to the predetermined images and texts, and a picture and text printing mechanism is arranged between the material belt conveying mechanism and the particle image and text forming mechanism, and the predetermined images and texts are printed on the surface of the printing material belt according to the particle images and texts. The flexographic printing equipment adopts the principle of magnetic imaging to convert digital image and text information into latent magnetic images and texts generated on the surface of an electromagnetic imaging plate, and converts the latent magnetic images and texts on the surface of the electromagnetic imaging plate into three-dimensional image and text information with solid particles, and then converts the solid particle image and text information into displacement image and text information on the surface of the printing cloth, thereby realizing the production of a digital flexographic printing plate, and realizing flexographic printing with variable printing information, without having to replace the flexographic printing plate.

Description

Technical Field

[0001] The invention belongs to the technical field of printing equipment, and in particular relates to a variable information digital flexographic printing equipment and a printing method. Background Art

[0002] "Green, digital, intelligent, and integrated" development has become the main direction of the printing industry. Although flexographic printing is an important environmentally friendly printing method, it also has many technical barriers in terms of green and digital development. As a key component of flexible printing, flexographic printing plates will generate a large amount of waste liquid during the production and manufacturing process. At the same time, frequent replacement of plates will also cause a lot of resource waste. Therefore, the study of variable information digital flexographic plates is of great significance to the entire printing industry. However, there is currently no mature variable information digital flexographic printing equipment on the market, and domestic and foreign experts have little research results on the digitalization of flexographic plates. Summary of the invention

[0003] The present invention is made to solve the above problems, and aims to provide a variable information digital flexographic printing device to replace the traditional flexographic printing method, which has the characteristics of variable data, personalization and on-demand production.

[0004] The present invention provides a device for printing predetermined images and texts on the surface of a printing material strip, and has the following characteristics: a material strip conveying mechanism for conveying the printing material strip; a particle image and text forming mechanism for generating raised particle images and texts according to the predetermined images and texts; and an image and text printing mechanism, which is arranged between the material strip conveying mechanism and the particle image and text forming mechanism, and is used to print the predetermined images and texts on the surface of the printing material strip according to the particle images and texts, wherein the particle image and text forming mechanism comprises a particle containing box, a particle coating roller, an imaging magnetic head and an electromagnetic imaging plate, wherein the particle containing box is used to contain imaging particles, the particle coating roller is used to absorb imaging particles, the imaging magnetic head is used to generate a corresponding magnetic flux distribution according to the predetermined images and texts, and when the imaging magnetic head is located on the electromagnetic imaging plate When the electromagnetic imaging plate is above the electromagnetic imaging plate, the imaging head forms a closed magnetic circuit with the electromagnetic imaging plate, so that a latent magnetic image corresponding to the predetermined image is formed on the electromagnetic imaging plate. When the particle coating roller moves to the top of the electromagnetic imaging plate, the latent magnetic image absorbs the imaging particles to form a raised particle image. The image printing mechanism includes an ink box, an ink coating roller, a printing pressure roller and a printing cloth. The ink box is used to hold ink, and the printing cloth is used to stick to the electromagnetic imaging plate to form a raised part corresponding to the particle image. The ink coating roller is used to dip the ink and apply the ink to the raised part of the printing cloth. When the printing material belt contacts the printing cloth with ink, the printing pressure roller is used to roll the printing material belt so that the ink is transferred to the printing material belt to form a predetermined image on the printing material belt. In the variable information digital flexographic printing device provided by the present invention, it can also have such a feature, and also includes: a particle removal mechanism, wherein the particle removal mechanism includes a magnetic brush wheel and a removal control member, and the removal control member is used to drive the magnetic brush wheel to roll on the surface of the electromagnetic imaging to remove the imaging particles.

[0005] The variable information digital flexographic printing device provided by the present invention may also have the following features: the surface of the edge portion of the magnetic imaging plate has grooves, and the electromagnetic imaging plate includes a friction-resistant layer, a ferromagnetic coating, a metal layer and a board base layer which are sequentially bonded together.

[0006] The variable information digital flexographic printing device provided by the present invention may also have the following features: wherein the particle image forming mechanism also includes an imaging plate driving cylinder, a particle coating transmission control component and an imaging head transmission control component; the imaging plate driving cylinder is connected to the electromagnetic imaging plate for driving the electromagnetic imaging plate to rise and fall; the particle coating transmission control component is connected to the particle coating roller for driving the particle coating roller; the imaging head transmission control component is connected to the imaging head for driving the imaging head.

[0007] The variable information digital flexographic printing device provided by the present invention may also have the following characteristics: wherein the imaging particles are magnetic powders, and the magnetic powders are iron powders, cobalt powders, nickel powders or powders of alloys composed of two or three elements of iron, cobalt and nickel.

[0008] The variable information digital flexographic printing device provided by the present invention may also have the following features: wherein the printing cloth is an elastic rubber cloth, which includes an elastic rubber layer and an ink-receptive layer bonded together, and the elastic rubber layer is used to bond with the electromagnetic imaging plate.

[0009] The variable information digital flexographic printing device provided by the present invention may also have the following features: wherein, the graphic printing mechanism also includes an ink coating roller control component and a printing pressure roller control component, the ink coating roller control component is connected to the ink coating roller for driving the ink coating roller, the printing pressure roller control component is connected to the printing pressure roller for driving the printing pressure roller, the material belt conveying mechanism includes a winding motor, an unwinding motor, two paper guide roller cylinders, and winding shafts that are arranged in sequence and parallel to each other, at least two paper guide rollers and an unwinding shaft, the two ends of the printing material belt are respectively sleeved on the winding shaft and the unwinding shaft and pass around the paper guide rollers in sequence, the winding motor is used to drive the winding shaft to rotate synchronously, the unwinding motor is used to drive the unwinding shaft and the winding shaft to rotate synchronously, and the two paper guide roller cylinders are respectively connected to two of the paper guide rollers for driving the paper guide rollers to rise and fall.

[0010] The variable information digital flexographic printing device provided by the present invention may also have such a feature, and further includes: an air pump, wherein the air pump is used to communicate with the groove to extract the air between the printing cloth and the electromagnetic imaging plate, so that the printing cloth is tightly attached to the surface of the electromagnetic imaging plate.

[0011] The variable information digital flexographic printing device provided by the present invention may also have such a feature, and further includes: a control processing device, wherein the control processing device is communicatively connected with the material belt conveying mechanism, the particle image forming mechanism, the image printing mechanism, the air pump and the particle removing mechanism, and is used to control the material belt conveying mechanism, the particle image forming mechanism, the image printing mechanism, the air pump and the particle removing mechanism, including an imaging head control unit, a material belt winding control unit, a particle coating roller control unit, an electromagnetic imaging plate control unit, an air pump control unit, an ink coating roller control unit, a material belt lifting control unit, a printing pressure roller control unit and a particle removing control unit.

[0012] The present invention also provides a printing method of a variable information digital flexographic printing device, which has the following characteristics and includes the following steps: Step 1, an imaging head control unit generates a magnetization pulse signal according to the dot matrix data information of a predetermined image and text, and generates an imaging head drive signal and a magnetic flux generation signal according to the magnetization pulse signal; Step 2, the imaging head control unit transmits the magnetization pulse signal to the imaging head, and the imaging head generates a magnetic flux distribution corresponding to the predetermined hot stamping image on the imaging head according to the magnetization pulse signal and the magnetic flux generation signal, and at the same time, the imaging head control unit transmits the imaging head drive signal to the imaging head transmission control component, drives the imaging head to move to the top of the electromagnetic imaging plate, and the imaging head and the electromagnetic imaging plate form a closed magnetic circuit. , so that a latent magnetic image corresponding to the predetermined image is formed on the electromagnetic imaging plate, and then the imaging head control unit generates a signal that the magnetic flux distribution is generated; step 3, the material strip winding control unit generates a control unwinding shaft signal according to the signal that the magnetic flux distribution is generated and transmits it to the winding motor and the unwinding motor, controls the winding shaft to start winding, and the unwinding shaft to start unwinding; step 4, the particle coating roller control unit generates a particle coating roller driving signal according to the signal that the magnetic flux distribution is generated and transmits it to the particle coating transmission control unit, the particle coating transmission control unit drives the particle coating roller to rotate in the particle holding box to absorb the imaging particles, and then reciprocates on the surface of the electromagnetic imaging plate, and the imaging particles are transferred from the particle coating roller to the latent magnetic image on the electromagnetic imaging plate to obtain particles. The particle pattern is formed on the surface of the electromagnetic imaging plate, and then the particle coating roller control unit generates a particle pattern generation completion signal; step 5, the electromagnetic imaging plate control unit generates an imaging plate driving signal according to the particle pattern generation completion signal, drives the imaging plate driving cylinder to move upward from its initial position, so that the electromagnetic imaging plate contacts the printing cloth, and then the electromagnetic imaging plate control unit generates a contact completion signal; step 6, the air pump control unit generates an air pump driving signal according to the contact completion signal, drives the air pump to start pumping, so that the printing cloth is tightly attached to the surface of the electromagnetic imaging plate so that a convex portion is formed on the surface of the printing cloth, and then the air pump control unit generates a pumping completion signal; step 7, the ink coating roller control unit generates an ink coating roller driving signal according to the pumping completion signal, controls the ink coating roller control unit to drive the oil The ink coating roller rotates to dip the ink in the ink box and then moves on the printing cloth, so that the ink is coated on the raised part, and then the ink coating roller control unit generates an ink coating completion signal; step 8, the material belt lifting control unit generates a material belt descending signal according to the ink coating completion signal, drives the paper guide roller cylinder to descend, and drives the printing material belt to descend until it contacts the printing cloth, and then the material belt lifting control unit generates a material belt contact completion signal; step 9, the printing pressure roller control unit generates a printing pressure roller control signal according to the material belt contact completion signal, drives the printing pressure roller control unit to drive the printing pressure roller to roll the printing material belt, so that the ink is transferred to the printing material belt to form a predetermined image on the printing material belt, and then the printing pressure roller control unit generates an image generation completion signal;Step 10: The electromagnetic imaging board control unit drives the imaging board drive cylinder to move downward according to the image generation completion signal, so that the electromagnetic imaging board returns to its initial position, and then generates a cylinder return signal; Step 11: The imaging head control unit generates a reverse magnetic field signal according to the cylinder return signal, transmits it to the imaging head transmission control component, drives the imaging head to move to the top of the electromagnetic imaging board and generates a reverse magnetic field to eliminate the latent magnetic image on the electromagnetic imaging board, and then the imaging head control unit generates a latent magnetic image elimination signal; Step 12: The particle removal control unit drives the magnetic brush wheel drive motor to drive the magnetic brush wheel to roll on the surface of the electromagnetic imaging according to the latent magnetic image elimination signal magnetic brush wheel drive signal to remove the imaging particles, and generates a removal completion signal; Step 13: The material belt lifting control unit generates a material belt rising signal according to the removal completion signal, drives the paper guide roller cylinder to rise, and drives the printing material belt and paper guide roller to return. ;

[0013] Functions and Effects of the Invention

[0014] According to the variable information digital flexographic printing device provided by the present invention, it is used to print predetermined images and texts on the surface of the printing material belt, the material belt conveying mechanism conveys the printing material belt, the particle image and text forming mechanism generates raised particle images and texts according to the predetermined images and texts, and the image and text printing mechanism is arranged between the material belt conveying mechanism and the particle image and text forming mechanism, and the predetermined images and texts are printed on the surface of the printing material belt according to the particle images and texts. The imaging magnetic head is used to generate latent magnetic images and texts corresponding to the predetermined images and texts on the electromagnetic imaging plate, and then the latent magnetic images and texts absorb imaging particles to form raised particle images and texts, and the printing cloth is attached to the electromagnetic imaging plate to form raised parts corresponding to the particle images and texts, and the ink coating roller is used to dip the ink and apply the ink to the raised parts of the printing cloth, and when the printing material belt contacts the printing cloth with ink, the printing pressure roller is used to roll the printing material belt to transfer the ink to the printing material belt to form the predetermined images and texts on the printing material belt.

[0015] According to the printing method of the variable information digital flexographic printing device provided by the present invention, digital graphic information is converted into latent magnetic graphics and generated on the surface of the electromagnetic imaging plate through the principle of magnetic imaging, and the latent magnetic graphics on the surface of the electromagnetic imaging plate are converted into three-dimensional graphic information by solid particles, and then the solid particle graphic information is converted into displacement graphic information on the surface of the printing cloth, thereby realizing the production of digital flexographic printing plates, and finally adopting a circular flattening method for printing, realizing flexographic printing with variable printing information, without having to replace the flexographic printing plate, and only changing the predetermined graphics. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic structural diagram of a variable information digital flexographic printing device in an embodiment of the present invention;

[0017] Figure 2is a schematic cross-sectional structural diagram of an electromagnetic imaging plate in an embodiment of the present invention;

[0018] Figure 3 is a schematic diagram of the surface structure of an electromagnetic imaging plate in an embodiment of the present invention;

[0019] Figure 4 is a schematic diagram of the imaging magnetic head structure and magnetization process in an embodiment of the present invention;

[0020] Figure 5 is a schematic structural diagram of a particle containing box and a particle coating roller in an embodiment of the present invention;

[0021] Figure 6 is a schematic structural diagram of an ink cartridge and an ink coating roller in an embodiment of the present invention;

[0022] Figure 7 is a schematic structural diagram of a particle removal mechanism in an embodiment of the present invention;

[0023] Figure 8 is a working schematic diagram of a variable information digital flexographic printing device in an embodiment of the present invention; and

[0024] Fig. 9 yes Figure 8 A partial enlargement of the figure. DETAILED DESCRIPTION

[0025] In order to make the technical means, creative features, objectives and effects of the present invention easy to understand, the variable information digital flexographic printing device of the present invention is specifically described below in conjunction with embodiments and drawings.

[0026] <Example>

[0027] Figure 1 It is a schematic structural diagram of a variable information digital flexographic printing device in an embodiment of the present invention.

[0028] like Figure 1 As shown, a variable information digital flexographic printing device (hereinafter referred to as flexographic printing device) 100 is used to print predetermined images on the surface of a printing material belt, and includes a base (not shown in the figure), a material belt conveying mechanism, a particle image forming mechanism, an image printing mechanism, a particle removing mechanism 50, an air pump 40, and a control processing device 60. The printing material belt 70 can be a paper or film material belt.

[0029] The base is a flexible printing equipment frame structure for supporting and installing the remaining components of the flexible printing equipment 100 in this embodiment. The control processing device 60 is respectively communicated with the material conveying mechanism, the particle image forming mechanism, the image printing mechanism, the particle removing mechanism 50 and the air pump 40.

[0030] The material belt conveying mechanism is installed on the base, and is used to convey the printing material belt 70. In this embodiment, the predetermined feeding direction is direction X.

[0031] The material belt conveying mechanism includes an unwinding motor (not marked in the drawings), a rewinding motor (not marked in the drawings), a first paper guide roller cylinder 11A, a second paper guide roller cylinder 11B, an unwinding shaft 12, two paper guide rollers (i.e., a first paper guide roller 13A and a second paper guide roller 13B) arranged in sequence along the X direction and parallel to each other, and a rewinding shaft 14. In practical applications, there may be multiple paper guide rollers, two of which move under the control of the cylinders.

[0032] The axis of the first paper guide roller 13A and the axis of the second paper guide roller 13B are both located in the first horizontal plane, and the axis of the unwinding shaft 12 and the axis of the winding shaft 14 are both located in the second horizontal plane.

[0033] The two ends of the printing material tape 70 are respectively sleeved on the unwinding shaft 12 and the rewinding shaft 13 and pass around the first paper guide roller 13A and the second paper guide roller 13B in sequence.

[0034] The printing web 70 located between the first paper guide roller 13A and the second paper guide roller 13B is used as a printing area.

[0035] The unwinding shaft 12 is sleeved with an unused printing material tape 70 , and the rewinding shaft 13 is used to recycle the printed printing material tape 70 by rotating.

[0036] The output end of the unwinding motor is mounted on the unwinding shaft 12 to drive the unwinding shaft 12 to rotate counterclockwise, and the output end of the winding motor is mounted on the winding shaft 13 to drive the winding shaft 13 to rotate counterclockwise.

[0037] The control processing device 60 controls the unwinding motor and the winding motor to rotate synchronously and rotate at the same step distance each time, so that the printing part moves along the X direction and the printing part is always in a tensioned state.

[0038] The output end of the first paper guide roller cylinder 11A is fixed on the first paper guide roller 13A, and the output end of the second paper guide roller cylinder 11B is fixed on the second paper guide roller 13B. The control processing device 60 controls the first paper guide roller cylinder 11A and the second paper guide roller cylinder 11B to rise or fall synchronously, driving the two paper guide rollers to move synchronously.

[0039] The particle pattern forming mechanism is installed on the base, and is used to generate raised particle patterns according to predetermined patterns, including an electromagnetic imaging plate 21, a base 22, an imaging plate driving cylinder 23, a first particle containing box 24A, a second particle containing box 24B, a particle coating roller 25, a particle coating transmission control component 26, an imaging head 27, and an imaging head transmission control component 28.

[0040] The electromagnetic imaging plate 21 is located at a predetermined position below the printing portion of the printing strip 70 . The electromagnetic imaging plate 21 is mounted on the base 22 , and the two are connected by bolts or fastening.

[0041] The output end of the imaging plate driving cylinder 23 is installed on the lower surface of the base 22, and drives the electromagnetic imaging plate 21 and the base 22 under the control of the control processing device 60, so that the electromagnetic imaging plate 21 rises from a predetermined position to a required position or returns to a predetermined position.

[0042] Figure 2 is a schematic cross-sectional structural diagram of an electromagnetic imaging plate in an embodiment of the present invention; Figure 3 It is a schematic diagram of the surface structure of the electromagnetic imaging plate in an embodiment of the present invention.

[0043] like Figure 2 , 3 As shown, the electromagnetic imaging plate 21 is a multi-layer structure, including a friction-resistant layer 211, a ferromagnetic coating 212, a metal layer 213 and a base layer 214 which are laminated together in sequence.

[0044] The friction-resistant layer 211 is located at the uppermost layer, and has four mutually intersecting rectangular grooves 215 at the edge of the surface. The numbers "1234" on the surface of the friction-resistant layer 211 represent predetermined graphics.

[0045] The ferromagnetic coating 212 is a soft and hard ferromagnetic coating, and the base layer 214 is non-magnetic.

[0046] like Figure 1 As shown, the imaging head 27 is arranged near the electromagnetic imaging plate 21 and is fixedly connected to the imaging head transmission control component 28. Under the control of the control processing device 60, the imaging head transmission control component 28 drives the imaging head 27 to move to the top of the electromagnetic imaging plate 21 or return to its original position.

[0047] Figure 4 It is a schematic diagram of the imaging magnetic head structure and magnetization process in an embodiment of the present invention.

[0048] like Figure 4 As shown, the imaging head 27 includes an imaging head core 271 and a powered coil 272 .

[0049] In this embodiment, the imaging head core 271 is an inverted “U”-shaped silicon steel core with an opening pointing vertically downward, and has a narrow pole 2711 and a wide pole 2712. The energized coil 272 is disposed around the outside of the imaging head core 271.

[0050] When a magnetization pulse signal is passed into the energized coil 272, a magnetic flux distribution corresponding to the predetermined image and text generation is generated on the imaging head core 271. When the imaging head 27 moves above the electromagnetic imaging board 21, the imaging head 27 forms a closed magnetic circuit with the electromagnetic imaging board 21. The narrow pole 2711 and the wide pole 2712 use the change of magnetic flux to produce different degrees of magnetization effect on the surface of the electromagnetic imaging board 21, and generate latent magnetic images corresponding to the predetermined image and text information in the ferromagnetic coating 212 in the electromagnetic imaging board 21.

[0051] Figure 5 It is a schematic structural diagram of a particle containing box and a particle coating roller in an embodiment of the present invention.

[0052] like Figure 1 , 5 As shown, the first particle holding box 24A and the second particle holding box 24B are respectively installed near the two ends of the electromagnetic imaging plate 21. In other embodiments, there can be only one particle holding box installed near one end of the electromagnetic imaging plate 21.

[0053] The first particle containing box 24A and the second particle containing box 24B have the same structure and function, and only the structure of the first particle containing box 24A will be described herein.

[0054] The first particle containing box 24A has an opening at the upper end, and contains imaging particles 241 that can be magnetized under an external magnetic field. The imaging particles 241 are magnetic conductive powders, which can be, but are not limited to, iron powder, cobalt powder, nickel powder, or powders of alloys of two or three elements among iron, cobalt, and nickel. In this embodiment, the imaging particles are iron powder.

[0055] An adsorption coil 242 is provided at the bottom of the containing box body 243 of the first particle containing box 24A. When powered on, the adsorption coil 242 generates a magnetic field, which makes the particle coating roller 25 located at the opening of the first particle containing box 24A generate magnetism and adsorb the imaging particles 241.

[0056] The particle coating transmission control member 26 is a rack transmission structure, which is fixedly connected to the particle coating roller 25. Under the control of the control processing device 60, the particle coating transmission control member 26 moves, thereby driving the particle coating roller 25 to rotate and absorb the imaging particles 241 first, and then slowly move to the surface of the electromagnetic imaging plate 21, and reciprocate on its surface. The adsorption force of the latent magnetic pattern of the electromagnetic imaging plate 21 on the imaging particles 241 is greater than the adsorption force of the particle coating roller 25 on the iron powder, so that the imaging particles 241 are adsorbed to the latent magnetic pattern of the electromagnetic imaging plate 21, and a raised particle pattern corresponding to the latent magnetic pattern is formed on the electromagnetic imaging plate 21. The image is as shown in FIG. Figure 3 The digital information "1234" is shown in the figure.

[0057] The particle coating roller 25 can be one or more, depending on the design speed or ink thickness and other related factors. When the ink in the printing area is relatively thick, the strength of the corresponding latent magnetic image adsorbing particles is relatively strong, and the particles may not be sufficient when a single coating roller is used, and multiple coatings are required. If multiple coating rollers are used for simultaneous coating, the coating amount and coating efficiency can be increased.

[0058] The particle coating roller 25 adsorbs imaging particles 241 from the first particle holding box 24A, and when the surface of the electromagnetic imaging plate 21 moves to the second particle holding box 24B, it can adsorb imaging particles 241 from the second particle holding box 24B without having to move back to the first particle holding box 24A to adsorb imaging particles 241.

[0059] like Figure 1 As shown, the graphic printing mechanism is used to print predetermined graphics onto the surface of the printing material strip 70 according to the raised particle graphics, and includes a printing cloth 31, two ink cartridges (a first ink cartridge 32A and a second ink cartridge 32B), an ink coating roller 33, an ink coating roller control unit 34, a printing pressure roller 35, and a printing pressure roller control unit 36.

[0060] The printing cloth 31 is unfolded and fixed on the base, and is located between the electromagnetic imaging plate 21 and the printing material belt 70. The printing cloth 31 is an elastic rubber cloth, including an elastic rubber layer and an ink-receptive layer bonded together, and the elastic rubber layer is used to bond with the electromagnetic imaging plate 21.

[0061] When the electromagnetic imaging plate 21 moves upward, the electromagnetic imaging plate 21 contacts the printing cloth 31, and the printing cloth 31 is in an arched state in the image area corresponding to the electromagnetic imaging plate 21. Since the air path of the air pump 40 is connected to the rectangular groove 215, under the control of the control processing device 60, the air pump 40 removes the air between the electromagnetic imaging plate 21 and the printing cloth 31 through its air path and the rectangular groove 215 on the friction-resistant layer 211, so that the printing cloth 31 is tightly adsorbed to the surface of the electromagnetic imaging plate 21.

[0062] Figure 6 It is a schematic structural diagram of an ink cartridge and an ink coating roller in an embodiment of the present invention.

[0063] like Figure 1 , 6 As shown, two ink boxes are respectively arranged near the two ends of the printing cloth 31, and the two have the same structure and function.

[0064] The ink box comprises a box body 321 and two scrapers 322 at the opening of the box body 321 . The two scrapers 322 form an upper opening, which can accommodate the ink coating roller 33 . The box body 321 is used to accommodate the ink 323 .

[0065] The ink coating roller 33 is an anilox roller. The ink coating roller control member 34 is a transmission structure composed of a gear and a connecting rod, which is fixedly connected to the ink coating roller 33 and is used to drive the ink coating roller 33 to rotate and move.

[0066] Under the control of the control processing device 60, the ink coating roller control part 34 moves, thereby driving the ink coating roller 33 to rotate first to dip ink from the ink box, and then move on the surface of the printing cloth 31, and the ink on the ink coating roller 33 is coated on the raised part of the printing cloth 31.

[0067] When the ink coating roller 33 moves from one end of the printing cloth 31 to the other end, if it is necessary to continue to dip in ink, it can dip in ink from the ink box nearest to the current position without returning. When the ink coating is completed, the ink coating roller control member 34 can drive the ink coating roller 33 to return to any ink box.

[0068] The printing pressure roller control member 36 is a transmission structure composed of a gear and a connecting rod, and is fixedly connected to the printing pressure roller 35 for rotating and reciprocating the printing pressure roller 35. The printing pressure roller 35 is located above the printing material belt 70.

[0069] When the printing material belt 70 descends and contacts the printing cloth 31 with ink, the printing pressure roller control component 36 drives the printing pressure roller 35 to descend, and then repeatedly rolls the printing material belt 70, so that the ink is transferred from the raised part to the printing material belt 70, thereby forming a predetermined image and text on the printing material belt, completing the image transfer.

[0070] After the graphic information is transferred to the printing material belt 70, the electromagnetic imaging plate 21 returns to the initial position, and the control processing device 60 sends a signal to the imaging head transmission control component 28 and the particle removal mechanism 50, so that the imaging head 27 moves on the surface of the electromagnetic imaging plate 21, and a current opposite to that during imaging is passed through the imaging head 27 to form a reverse magnetic field to eliminate the latent magnetic graphics on the ferromagnetic coating 212 in the electromagnetic imaging plate 21. Then the particle removal mechanism 50 removes the particles on the surface of the electromagnetic imaging plate 21, thereby completing a complete ink transfer process. Repeating the above steps can be performed for the next round of ink transfer.

[0071] Figure 7 Schematic diagram of the structure of the particle removal mechanism in the embodiment of the present invention.

[0072] like Figure 1 , 7 As shown, the particle removal mechanism 50 includes a magnetic brush wheel 51, a removal box 52 and a removal control member.

[0073] The cleaning control component can use the imaging head transmission control component 28, or it can be a control component with the same structure. In the present embodiment, both are the imaging head transmission control component 28. The magnetic brush wheel 51 is arranged side by side with the imaging head 27, and both are controlled by the imaging head transmission control component 28.

[0074] The imaging head transmission control component 28 drives the magnetic brush wheel driving motor 52 to roll on the surface of the electromagnetic imaging plate 21 to remove particles.

[0075] The opening of the cleaning box 52 is downward, and a cleaning coil 521 is arranged on the top. The magnetic brush wheel 51 is installed inside the cleaning box 52, and has a plurality of bristles on the surface. In this embodiment, the plurality of bristles are evenly distributed along the circumference of the magnetic brush wheel 51, and the bristles extend toward the outside of the magnetic brush wheel 51 along the radial direction of the magnetic brush wheel 51. When the cleaning coil 521 is energized, a magnetic field is generated, so that the magnetic brush wheel 51 generates magnetism, thereby adsorbing particles on the surface of the electromagnetic imaging plate 21 and removing particle images. The magnetic brush wheel 51 can be multiple or single.

[0076] Figure 8 is a working schematic diagram of a variable information digital flexographic printing device in an embodiment of the present invention; Fig. 9 yes Figure 8 A partial enlargement of the figure.

[0077] like Figure 8 , 9 As shown, the control processing device 60 is communicatively connected with the material belt conveying mechanism, the particle image forming mechanism, the image printing mechanism, the air pump 40 and the particle removing mechanism 50, and includes an imaging head control unit, a material belt winding control unit, a particle coating roller control unit, an electromagnetic imaging plate control unit, an air pump control unit, an ink coating roller control unit, a material belt lifting control unit, a printing pressure roller control unit and a particle removing control unit.

[0078] The printing method of the variable information digital flexographic printing equipment includes the following steps:

[0079] In the pre-conversion step, the graphic information to be printed, i.e. the predetermined graphic information, is converted into dot matrix data information after passing through a raster image processor (RIP).

[0080] Step 1: The imaging head control unit generates a magnetization pulse signal according to the dot matrix data information of a predetermined image and text, and generates an imaging head driving signal and a magnetic flux generation signal according to the magnetization pulse signal.

[0081] Step 2, the imaging head control unit transmits the magnetization pulse signal to the imaging head, and the imaging head generates a magnetic flux distribution corresponding to the predetermined hot stamping image on the imaging head according to the magnetization pulse signal and the magnetic flux generation signal. At the same time, the imaging head control unit transmits the imaging head drive signal to the imaging head transmission control component, and drives the imaging head to move to the top of the electromagnetic imaging board. The imaging head and the electromagnetic imaging board form a closed magnetic circuit, so that latent magnetic images corresponding to the predetermined images are formed on the electromagnetic imaging board, and then the imaging head control unit generates a magnetic flux distribution generation completion signal.

[0082] Step 3: The material strip winding control unit generates a signal to control the unwinding axis according to the completion signal generated by the magnetic flux distribution and transmits it to the winding motor and the unwinding motor to control the winding axis to start winding and the unwinding axis to start unwinding.

[0083] Step 4, the particle coating roller control unit generates a particle coating roller driving signal according to the completion signal generated by the magnetic flux distribution and transmits it to the particle coating transmission control unit, the particle coating transmission control unit drives the particle coating roller to rotate in the particle holding box to adsorb the imaging particles, and then reciprocates on the surface of the electromagnetic imaging plate, the imaging particles are transferred from the particle coating roller to the latent magnetic image on the electromagnetic imaging plate to obtain the particle image, and then the particle coating roller control unit generates a particle image generation completion signal.

[0084] Step 5, the electromagnetic imaging plate control unit generates an imaging plate driving signal according to the particle image generation completion signal, drives the imaging plate driving cylinder to move upward from its initial position, so that the electromagnetic imaging plate contacts the printing cloth, and then the electromagnetic imaging plate control unit generates a contact completion signal.

[0085] Step 6, the air pump control unit generates an air pump driving signal according to the contact completion signal, drives the air pump to start pumping air, so that the printed cloth is tightly attached to the surface of the electromagnetic imaging plate to form a convex part on the surface of the printed cloth, and then the air pump control unit generates a pumping completion signal.

[0086] Step 7, the ink coating roller control unit generates an ink coating roller driving signal according to the vacuum completion signal, controls the ink coating roller control component to drive the ink coating roller to rotate and dip the ink in the ink box and then move on the printing cloth to apply the ink to the raised parts, and then the ink coating roller control unit generates an ink coating completion signal.

[0087] Step 8: The material belt lifting control unit generates a material belt descending signal according to the ink coating completion signal, drives the paper guide roller cylinder to descend, drives the printing material belt to descend until it contacts the printing cloth, and then the material belt lifting control unit generates a material belt contact completion signal;

[0088] Step 9, the printing pressure roller control unit generates a printing pressure roller control signal according to the material tape contact completion signal, drives the printing pressure roller control component to drive the printing pressure roller to press the printing material tape, so that the ink is transferred to the printing material tape to form a predetermined image on the printing material tape, and then the printing pressure roller control unit generates an image generation completion signal.

[0089] Step 10, the electromagnetic imaging board control unit drives the imaging board driving cylinder to move downward according to the image generation completion signal, so that the electromagnetic imaging board returns to its initial position, and then generates a cylinder return signal.

[0090] Step 11, the imaging head control unit generates a reverse magnetic field signal according to the cylinder return signal, transmits it to the imaging head transmission control component, drives the imaging head to move above the electromagnetic imaging board and generates a reverse magnetic field to eliminate the latent magnetic image on the electromagnetic imaging board, and then the imaging head control unit generates a latent magnetic image elimination signal.

[0091] Step 12, the particle removal control unit drives the magnetic brush wheel driving motor to drive the magnetic brush wheel to roll on the surface of the electromagnetic imaging according to the latent magnetic image elimination signal and the magnetic brush wheel driving signal, thereby removing the imaging particles and generating a removal completion signal.

[0092] Step 13, the material belt lifting control unit generates a material belt lifting signal according to the clearing completion signal, drives the paper guide roller cylinder to rise, and drives the printing material belt and the paper guide roller to return to their positions.

[0093] Functions and Effects of the Embodiments

[0094] According to the variable information digital flexographic printing device provided in this embodiment, it is used to print a predetermined image on the surface of the printing material belt, the material belt conveying mechanism conveys the printing material belt, the particle image forming mechanism generates a raised particle image according to the predetermined image, and the image printing mechanism is arranged between the material belt conveying mechanism and the particle image forming mechanism, and the predetermined image is printed on the surface of the printing material belt according to the particle image. The imaging magnetic head is used to generate a latent magnetic image corresponding to the predetermined image on the electromagnetic imaging plate, and then the latent magnetic image adsorbs the imaging particles to form a raised particle image, and the printing cloth is attached to the electromagnetic imaging plate to form a raised part corresponding to the particle image, and the ink coating roller is used to dip the ink and apply the ink to the raised part of the printing cloth. When the printing material belt contacts the printing cloth with ink, the printing pressure roller is used to roll the printing material belt to transfer the ink to the printing material belt to form a predetermined image on the printing material belt. The flexographic printing equipment adopts the principle of magnetic imaging to convert digital image information into latent magnetic images, which are generated on the surface of the electromagnetic imaging plate. The latent magnetic images on the surface of the electromagnetic imaging plate are converted into three-dimensional image information using solid particles. The elastic effect of the printing cloth is then used to convert the solid particle image information into displacement image information on the surface of the elastic body, thereby realizing the production of digital flexographic printing plates. Finally, a circular flattening method is used for printing to realize flexographic printing with variable printing information. There is no need to replace the flexographic printing plate, only the predetermined image needs to be changed.

[0095] Because the electromagnetic imaging plate of this embodiment has grooves on its surface, and the grooves are connected to the air path of the air pump, when the electromagnetic imaging plate contacts the elastic rubber cloth, negative pressure is used to extract the air between the two, so that the surface displacement information of the elastic rubber cloth, that is, the convex part, is more obvious. At the same time, the elastic rubber cloth includes an elastic rubber layer and an ink-receptive layer bonded together, the elastic rubber layer is bonded to the electromagnetic imaging plate, and the ink-receptive layer makes it easier to apply ink.

[0096] Because the imaging head of this embodiment can form a reverse magnetic field to eliminate the original latent magnetic image, and this embodiment also includes a particle removal mechanism, the particle removal mechanism includes a magnetic brush wheel and a cleaning control component, the cleaning control component drives the magnetic brush wheel to remove the imaging particles, so as to facilitate the generation of the next image.

[0097] Because the imaging particles of this embodiment can be magnetized under an external magnetic field, they can be easily coated on the surface of the electromagnetic imaging plate.

[0098] The above-mentioned embodiments are preferred examples of the present invention and are not intended to limit the protection scope of the present invention.

Claims

1. A variable information digital flexographic printing device for printing predetermined images and texts on the surface of a printing strip, characterized in that: include: The material belt conveying mechanism is used to convey the printing material belt; A particle pattern forming mechanism, used for generating raised particle patterns according to the predetermined patterns; as well as The graphic printing mechanism is arranged between the material belt conveying mechanism and the particle graphic forming mechanism, and is used to print the predetermined graphic onto the surface of the printing material belt according to the particle graphic. The particle image forming mechanism includes a particle containing box, a particle coating roller, an imaging magnetic head and an electromagnetic imaging plate. The particle holding box is used to hold imaging particles, and the particle coating roller is used to absorb the imaging particles. The imaging magnetic head is used to generate a corresponding magnetic flux distribution according to the predetermined image. When the imaging magnetic head is located above the electromagnetic imaging plate, the imaging magnetic head and the electromagnetic imaging plate form a closed magnetic circuit, so that a latent magnetic image corresponding to the predetermined image is formed on the electromagnetic imaging plate. When the particle coating roller moves to the top of the electromagnetic imaging plate, the latent magnetic image absorbs the imaging particles to form the raised particle image. The graphic printing mechanism includes an ink box, an ink coating roller, a printing pressure roller and a printing cloth. The ink box is used to contain ink, the printing cloth is used to be attached to the electromagnetic imaging plate to form raised areas corresponding to the particle image, the ink application roller is used to dip the ink and apply the ink to the raised areas of the printing cloth, and when the printing tape contacts the printing cloth with the ink, the printing pressure roller is used to roll the printing tape so that the ink is transferred to the printing tape to form the predetermined image on the printing tape.

2. The variable information digital flexographic printing device according to claim 1, characterized in that: Also includes: Particle removal mechanism, Wherein, the particle removal mechanism includes a magnetic brush wheel and a removal control member, The cleaning control member is used to drive the magnetic brush wheel to roll on the surface of the electromagnetic imaging so as to clean the imaging particles.

3. The variable information digital flexographic printing device according to claim 2, characterized in that: in, The surface of the edge portion of the electromagnetic imaging plate has a groove, The electromagnetic imaging plate comprises a friction-resistant layer, a ferromagnetic coating, a metal layer and a plate base layer which are sequentially bonded together.

4. The variable information digital flexographic printing device according to claim 3, characterized in that: in, The particle image forming mechanism also includes an imaging plate driving cylinder, a particle coating transmission control component and an imaging magnetic head transmission control component. The imaging plate driving cylinder is connected to the electromagnetic imaging plate and is used to drive the electromagnetic imaging plate to rise and fall. The particle coating transmission control member is connected to the particle coating roller and is used to drive the particle coating roller. The imaging magnetic head transmission control component is connected to the imaging magnetic head and is used to drive the imaging magnetic head.

5. The variable information digital flexographic printing device according to claim 4, characterized in that: in, The imaging particles are magnetically conductive powders, and the magnetically conductive powders are iron powders, cobalt powders, nickel powders, or powders of alloys composed of two or three elements of iron, cobalt, and nickel.

6. The variable information digital flexographic printing device according to claim 5, characterized in that: in, The printing cloth is an elastic rubber cloth, which comprises an elastic rubber layer and an ink-receptive layer bonded together, and the elastic rubber layer is used to bond with the electromagnetic imaging plate.

7. The variable information digital flexographic printing device according to claim 6, characterized in that: in, The graphic printing mechanism also includes an ink coating roller control component and a printing pressure roller control component. The ink coating roller control member is connected to the ink coating roller and is used to drive the ink coating roller. The printing pressure roller control component is connected to the printing pressure roller and is used to drive the printing pressure roller. The material belt conveying mechanism includes a winding motor, an unwinding motor, two paper guide roller cylinders, a winding shaft, at least two paper guide rollers and an unwinding shaft which are arranged in sequence and parallel to each other. The two ends of the printing material tape are respectively sleeved on the reel and the unreel and pass around the paper guide roller in sequence. The winding motor is used to drive the winding shaft to rotate synchronously. The unwinding motor is used to drive the unwinding shaft and the rewinding shaft to rotate synchronously. The two paper guide roller cylinders are respectively connected to two of the paper guide rollers and are used to drive the paper guide rollers to rise and fall.

8. The variable information digital flexographic printing device according to claim 7, characterized in that: Also includes: air pump, The air pump is used to communicate with the groove to extract the air between the printing cloth and the electromagnetic imaging plate, so that the printing cloth is closely attached to the surface of the electromagnetic imaging plate.

9. The variable information digital flexographic printing device according to claim 8, characterized in that: Also includes: control processing device, The control processing device is connected in communication with the material belt conveying mechanism, the particle image forming mechanism, the image printing mechanism, the air pump and the particle removing mechanism, and is used to control the material belt conveying mechanism, the particle image forming mechanism, the image printing mechanism, the air pump and the particle removing mechanism. The control processing device includes an imaging head control unit, a material belt winding control unit, a particle coating roller control unit, an electromagnetic imaging plate control unit, an air pump control unit, an ink coating roller control unit, a material belt lifting control unit, a printing pressure roller control unit and a particle removal control unit.

10. A printing method using the variable information digital flexographic printing device according to claim 9, characterized in that: The following steps are involved: Step 1, the imaging head control unit generates a magnetization pulse signal according to the dot matrix data information of the predetermined image and text, and generates an imaging head drive signal and a magnetic flux generation signal according to the magnetization pulse signal; Step 2, the imaging head control unit transmits the magnetization pulse signal to the imaging head, and the imaging head generates the magnetic flux distribution corresponding to the predetermined image on the imaging head according to the magnetization pulse signal and the magnetic flux generation signal. At the same time, the imaging head control unit transmits the imaging head drive signal to the imaging head transmission control unit to drive the imaging head to move above the electromagnetic imaging board. The imaging head and the electromagnetic imaging board form a closed magnetic circuit, so that the latent magnetic image corresponding to the predetermined image is formed on the electromagnetic imaging board, and then the imaging head control unit generates a magnetic flux distribution generation completion signal; Step 3, the material strip winding control unit generates a control signal for the unwinding shaft according to the completion signal of the magnetic flux distribution generation and transmits the signal to the winding motor and the unwinding motor to control the winding shaft to start winding and the unwinding shaft to start unwinding; Step 4, the particle coating roller control unit generates a particle coating roller driving signal according to the magnetic flux distribution generation completion signal and transmits it to the particle coating transmission control unit, the particle coating transmission control unit drives the particle coating roller to rotate in the particle holding box to adsorb the imaging particles, and then reciprocates on the surface of the electromagnetic imaging plate, the imaging particles are transferred from the particle coating roller to the latent magnetic image on the electromagnetic imaging plate to obtain the particle image, and then the particle coating roller control unit generates a particle image generation completion signal; Step 5, the electromagnetic imaging plate control unit generates an imaging plate driving signal according to the particle image generation completion signal, drives the imaging plate driving cylinder to move upward from its initial position, so that the electromagnetic imaging plate contacts the printing cloth, and then the electromagnetic imaging plate control unit generates a contact completion signal; Step 6, the air pump control unit generates an air pump driving signal according to the contact completion signal, drives the air pump to start pumping air, so that the printed cloth is closely attached to the surface of the electromagnetic imaging plate so that a convex portion is formed on the surface of the printed cloth, and then the air pump control unit generates a pumping completion signal; Step 7, the ink coating roller control unit generates an ink coating roller driving signal according to the exhaust completion signal, controls the ink coating roller control unit to drive the ink coating roller to rotate and dip the ink in the ink box and then move on the printing cloth, so that the ink is coated on the raised part, and then the ink coating roller control unit generates an ink coating completion signal; Step 8, the material belt lifting control unit generates a material belt descending signal according to the ink coating completion signal, drives the paper guide roller cylinder to descend, drives the printing material belt to descend until it contacts the printing cloth, and then the material belt lifting control unit generates a material belt contact completion signal; Step 9, the printing pressure roller control unit generates a printing pressure roller control signal according to the material tape contact completion signal, drives the printing pressure roller control unit to drive the printing pressure roller to roll the printing material tape, so that the ink is transferred to the printing material tape to form the predetermined image on the printing material tape, and then the printing pressure roller control unit generates an image generation completion signal; Step 10, the electromagnetic imaging board control unit drives the imaging board driving cylinder to move downward according to the image generation completion signal, so that the electromagnetic imaging board returns to its initial position, and then generates a cylinder return signal; Step 11, the imaging head control unit generates a reverse magnetic field signal according to the cylinder return signal, transmits the reverse magnetic field signal to the imaging head transmission control unit, drives the imaging head to move above the electromagnetic imaging board and generates a reverse magnetic field to eliminate the latent magnetic image on the electromagnetic imaging board, and then the imaging head control unit generates a latent magnetic image elimination signal; Step 12, the particle removal control unit drives the magnetic brush wheel driving motor to drive the magnetic brush wheel to roll on the surface of the electromagnetic imaging according to the latent magnetic image elimination signal and the magnetic brush wheel driving signal, thereby removing the imaging particles and generating a removal completion signal; Step 13, the material belt lifting control unit generates a material belt lifting signal according to the clearing completion signal, drives the paper guide roller cylinder to rise, and drives the printing material belt and the paper guide roller to return to their positions.

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