阅读说明：本技术 一种可变信息数字柔性版印刷设备及印刷方式 (Variable information digital flexible plate printing equipment and printing mode ) 是由 金琳 秦晓楠 肖颖 乔俊伟 于 2020-12-02 设计创作，主要内容包括：本发明属于印刷设备技术领域,提供了一种可变信息数字柔性版印刷设备及印刷方式,用于将预定图文印刷至印刷料带的表面,料带输送机构对印刷料带进行输送,颗粒图文形成机构根据预定图文生成凸起的颗粒图文,图文印刷机构设置在料带输送机构与颗粒图文形成机构之间,根据颗粒图文将预定图文印刷至印刷料带的表面。该柔性版印刷设备通过采用磁成像原理,将数字图文信息转换成潜磁图文生成在电磁成像板表面,并将电磁成像板上表面的潜磁图文用固体颗粒物转换成立体图文信息,然后将固体颗粒物图文信息转换成印刷布表面的位移图文信息,从而实现数字柔印印版的制作,实现印刷信息可变的柔印印刷,不必更换柔印版。(The invention belongs to the technical field of printing equipment, and provides variable information digital flexible plate printing equipment and a printing mode, which are used for printing preset pictures and texts on the surface of a printing material belt, wherein a material belt conveying mechanism conveys the printing material belt, a particle picture and text forming mechanism generates raised particle pictures and texts according to the preset pictures and texts, and a picture and text printing mechanism is arranged between the material belt conveying mechanism and the particle picture and text forming mechanism and prints the preset pictures and texts on the surface of the printing material belt according to the particle pictures and texts. The flexographic printing equipment converts digital image-text information into a latent magnetic image-text to be generated on the surface of an electromagnetic imaging plate by adopting a magnetic imaging principle, converts the latent magnetic image-text on the upper surface of the electromagnetic imaging plate into three-dimensional image-text information by using solid particles, and then converts the image-text information of the solid particles into displacement image-text information on the surface of printing cloth, thereby realizing the manufacture of a digital flexographic printing plate, realizing the flexographic printing with variable printing information and avoiding replacing the flexographic printing plate.)

1. A variable information digital flexographic printing device for printing a predetermined image and text on a surface of a printing material web, comprising:

the material belt conveying mechanism is used for conveying the printing material belt;

the particle image-text forming mechanism is used for generating convex particle image-texts according to the preset image-texts; and

the image-text printing mechanism is arranged between the material belt conveying mechanism and the particle image-text forming mechanism and is used for printing the preset image-text on the surface of the printing material belt according to the particle image-text,

wherein the particle image-text forming mechanism comprises a particle containing box, a particle coating roller, an imaging magnetic head and an electromagnetic imaging plate,

the particle containing cassette for containing imaging particles, the particle coating roller for adsorbing the imaging particles,

the imaging magnetic head is used for generating corresponding magnetic flux distribution according to the preset graphics and texts, when the imaging magnetic head is positioned above the electromagnetic imaging plate, the imaging magnetic head and the electromagnetic imaging plate form a closed magnetic circuit, so that the latent magnetic graphics corresponding to the preset graphics and texts are formed on the electromagnetic imaging plate, when the particle coating roller moves to the upper part of the electromagnetic imaging plate, the latent magnetic graphics and texts adsorb the imaging particles to form raised particle graphics and texts,

the image-text printing mechanism comprises an ink box, an ink coating roller, a printing pressure roller and printing cloth,

the printing ink box is used for holding printing ink, printing cloth is used for laminating form on the electromagnetic imaging board with the protruding position that the granule picture and text corresponds, printing ink coating roll is used for dipping in printing ink and will printing ink coating arrives the protruding position of printing cloth, works as the printing material area with have printing ink when the printing cloth contact, the printing pressure roller is used for rolling the printing material area, makes printing ink transfer to thereby form on the printing material area predetermined picture and text.

2. The variable information digital flexographic printing device according to claim 1, further comprising:

a particle removing mechanism for removing the particles from the container,

wherein the particle removing mechanism comprises a magnetic brush wheel and a removing control element,

the cleaning control part is used for driving 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:

wherein a 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 layer, a metal layer and a plate base layer which are sequentially attached together.

4. The variable information digital flexographic printing device according to claim 3, characterized in that:

wherein the particle image-text forming mechanism further comprises an imaging plate driving cylinder, a particle coating transmission control part and an imaging magnetic head transmission control part,

the imaging plate driving cylinder is connected with the electromagnetic imaging plate and used for driving the electromagnetic imaging plate to lift,

the particle coating transmission control part is connected with the particle coating roller and is used for driving the particle coating roller,

the imaging magnetic head transmission control part is connected with the imaging magnetic head and used for driving the imaging magnetic head.

5. The variable information digital flexographic printing device according to claim 4, characterized in that:

the imaging particles are magnetic powder, and the magnetic powder is iron powder, cobalt powder, nickel powder or alloy powder consisting 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:

the printing cloth is elastic rubber cloth which comprises an elastic rubber layer and an ink affinity layer which are attached together, and the elastic rubber layer is used for being attached to the electromagnetic imaging plate.

7. The variable information digital flexographic printing device according to claim 6, characterized in that:

wherein the image-text printing mechanism also comprises an ink coating roller control part and a printing pressure roller control part,

the ink coating roller control part is connected with the ink coating roller and used for driving the ink coating roller,

the printing pressure roller control is connected with the printing pressure roller and used for driving the printing pressure roller,

the material belt conveying mechanism comprises 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 sequentially arranged and are parallel to each other,

two ends of the printing material belt are respectively sleeved on the winding shaft and the unwinding shaft and sequentially pass around the paper guide roller,

the winding motor is used for driving the winding shaft to synchronously rotate,

the unreeling motor is used for driving the unreeling shaft and the reeling shaft to synchronously rotate,

and the two paper guide roller cylinders are respectively connected with two of the paper guide rollers and used for driving the paper guide rollers to lift.

8. The variable information digital flexographic printing device according to claim 7, further comprising:

an air pump is arranged on the air outlet of the air pump,

the air pump is used for being communicated with the groove and pumping out 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.

9. The variable information digital flexographic printing device according to claim 8, further comprising:

a control processing device for controlling the operation of the device,

wherein the control processing device is in communication connection with the material belt conveying mechanism, the particle image-text forming mechanism, the image-text printing mechanism, the air pump and the particle cleaning mechanism and is used for controlling the material belt conveying mechanism, the particle image-text forming mechanism, the image-text printing mechanism, the air pump and the particle cleaning mechanism,

the control processing device comprises an imaging magnetic head control part, a material belt winding control part, a particle coating roller control part, an electromagnetic imaging plate control part, an air pump control part, an ink coating roller control part, a material belt lifting control part, a printing pressure roller control part and a particle removal control part.

10. A printing mode using the variable information digital flexographic printing apparatus according to claim 9, comprising the steps of:

step 1, the imaging magnetic head control part generates a magnetization pulse signal according to the dot matrix data information of the preset image-text, and generates an imaging magnetic head driving signal and a magnetic flux generating signal according to the magnetization pulse signal;

step 2, the imaging magnetic head control part transmits the magnetization pulse signal to the imaging magnetic head, the imaging magnetic head generates the magnetic flux distribution corresponding to the preset hot stamping image on the imaging magnetic head according to the magnetization pulse signal and a magnetic flux generation signal, meanwhile, the imaging magnetic head control part transmits the imaging magnetic head driving signal to the imaging magnetic head transmission control part to drive the imaging magnetic head to move above the electromagnetic imaging plate, the imaging magnetic head and the electromagnetic imaging plate form a closed magnetic circuit, so that the electromagnetic imaging plate forms the latent magnetic image-text corresponding to the preset image-text, and then the imaging magnetic head control part generates a magnetic flux distribution generation finishing signal;

step 3, the material belt winding control part generates a signal for controlling an unwinding shaft according to the magnetic flux distribution generation finishing signal 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 part generates a particle coating roller driving signal according to the magnetic flux distribution generation completion signal and transmits the particle coating roller driving signal to the particle coating transmission control part, the particle coating transmission control part drives the particle coating roller to rotate and adsorb the imaging particles in the particle containing box and then to reciprocate on the surface of the electromagnetic imaging plate, the imaging particles are transferred to the latent magnetic image-text on the electromagnetic imaging plate from the particle coating roller to obtain the particle image-text, and then the particle coating roller control part generates a particle image-text generation completion signal;

step 5, the electromagnetic imaging plate control part generates an imaging plate driving signal according to a particle image-text generation finishing signal, drives the imaging plate driving cylinder to move upwards from an initial position of the imaging plate driving cylinder, so that the electromagnetic imaging plate is in contact with the printing cloth, and then the electromagnetic imaging plate control part generates a contact finishing signal;

step 6, the air pump control part generates an air pump driving signal according to the contact completion signal, drives the air pump to start air pumping, enables the printing cloth to be tightly attached to the surface of the electromagnetic imaging plate, enables the surface of the printing cloth to form a convex part, and then generates an air pumping completion signal;

step 7, the ink coating roller control part generates an ink coating roller driving signal according to the air exhaust completion signal, controls an ink coating roller control part to drive the ink coating roller to rotate, dip the ink in the ink box and move on the printing cloth, so that the ink is coated on the convex part, and then generates an ink coating completion signal;

step 8, the material belt lifting control part 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 to be in contact with the printing cloth, and then generates a material belt contact completion signal;

step 9, the printing pressure roller control part generates a printing pressure roller control signal according to the material strip contact completion signal, drives the printing pressure roller control part to drive the printing pressure roller to roll the printing material strip, so that the printing ink is transferred to the printing material strip to form the preset image-text on the printing material strip, and then the printing pressure roller control part generates an image generation completion signal;

step 10, the electromagnetic imaging plate control part drives the imaging plate driving cylinder to move downwards according to the image generation finishing signal, so that the electromagnetic imaging plate returns to the initial position, and then a cylinder return signal is generated;

step 11, the imaging magnetic head control part generates a reverse magnetic field signal according to the cylinder return signal, transmits the reverse magnetic field signal to the imaging magnetic head transmission control part, drives the imaging magnetic head to move above the electromagnetic imaging plate and generate a reverse magnetic field, eliminates the latent magnetic image-text on the electromagnetic imaging plate, and then the imaging magnetic head control part generates a latent magnetic image-text elimination signal;

step 12, the particle removal control part removes a magnetic brush wheel driving signal according to the latent magnetic image, drives the magnetic brush wheel driving motor to drive the magnetic brush wheel to roll on the surface of the electromagnetic imaging so as to remove the imaging particles, and generates a removal completion signal;

and step 13, the material belt lifting control part generates a material belt lifting signal according to the removal finishing signal, drives the paper guide roller cylinder to lift, and drives the printing material belt and the paper guide roller to return.

Technical Field

The invention belongs to the technical field of printing equipment, and particularly relates to variable information digital flexographic printing equipment and a printing mode.

Background

The development of "greenization, digitalization, intellectualization and integration" becomes the main direction of the development of the printing industry, and the flexographic printing is an important environment-friendly printing mode, but has a lot of technical barriers in the aspects of greenization and digitalization development. The flexible printing plate is used as a key component of the flexible printing, a large amount of waste liquid can be generated in the production and manufacturing processes, and meanwhile, a large amount of resource waste can be caused by frequently replacing the plate material, so that the research on the variable information digital flexible printing plate has very important significance to the whole printing industry. However, no mature variable information digital flexible plate printing equipment exists in the market at present, and the digital research result of experts at home and abroad on the flexible plate is less.

Disclosure of Invention

The present invention has been made to solve the above problems, and an object of the present invention is to provide a variable information digital flexographic printing apparatus having the characteristics of variable data, individualization, and production on demand, instead of the conventional flexographic printing method.

The invention provides a method for printing a predetermined pattern on a surface of a printing material belt, which is characterized by comprising the following steps: the material belt conveying mechanism is used for conveying the printing material belt; the particle image-text forming mechanism is used for generating raised particle image-texts according to preset image-texts; and a pattern-text printing mechanism arranged between the material belt conveying mechanism and the particle pattern-text forming mechanism and used for printing preset patterns and texts on the surface of the printing material belt according to the particle patterns and texts, wherein the particle pattern-text forming mechanism comprises a particle containing box, a particle coating roller, an imaging magnetic head and an electromagnetic imaging plate, the particle containing box is used for containing imaging particles, the particle coating roller is used for adsorbing the imaging particles, the imaging magnetic head is used for generating corresponding magnetic flux distribution according to the preset patterns and texts, when the imaging magnetic head is positioned above the electromagnetic imaging plate, the imaging magnetic head and the electromagnetic imaging plate form a closed magnetic circuit so as to form latent magnetic patterns and texts corresponding to the preset patterns and texts on the electromagnetic imaging plate, when the particle coating roller moves above the electromagnetic imaging plate, the latent magnetic patterns and texts adsorb the imaging particles to form convex particle patterns and texts, and the pattern-text printing mechanism comprises an oil ink box, an ink coating, the printing ink box is used for holding printing ink, and printing cloth is used for laminating and forms the protruding position that corresponds with granule picture and text on the electromagnetic imaging board, and printing ink coating roll is used for dipping in printing ink and coats the protruding position of printing cloth with printing ink, and when the printing material area contacted with the printing cloth that has printing ink, printing pressure roller was used for rolling the printing material area, thereby made printing ink transfer form predetermined picture and text on the printing material area. In the variable information digital flexographic printing apparatus provided by the present invention, there may be further provided a feature further comprising: and the particle removing mechanism comprises a magnetic brush wheel and a removing control part, and the removing control part is used for driving the magnetic brush wheel to roll on the surface of the electromagnetic imaging so as to remove the imaging particles.

In the variable information digital flexographic printing apparatus provided by the present invention, there may be further provided the features of: the surface of the edge part of the magnetic imaging plate is provided with a groove, and the electromagnetic imaging plate comprises a friction-resistant layer, a ferromagnetic coating layer, a metal layer and a plate base layer which are sequentially attached together.

In the variable information digital flexographic printing apparatus provided by the present invention, there may be further provided the features of: the particle image-text forming mechanism further comprises an imaging plate driving cylinder, a particle coating transmission control piece and an imaging magnetic head transmission control piece, wherein the imaging plate driving cylinder is connected with the electromagnetic imaging plate and used for driving the electromagnetic imaging plate to lift, the particle coating transmission control piece is connected with the particle coating roller and used for driving the particle coating roller, and the imaging magnetic head transmission control piece is connected with the imaging magnetic head and used for driving the imaging magnetic head.

In the variable information digital flexographic printing apparatus provided by the present invention, there may be further provided the features of: the imaging particles are magnetic powder, and the magnetic powder is iron powder, cobalt powder, nickel powder or alloy powder consisting of two or three elements of iron, cobalt and nickel.

In the variable information digital flexographic printing apparatus provided by the present invention, there may be further provided the features of: the printing cloth is elastic rubber cloth which comprises an elastic rubber layer and an ink affinity layer which are attached together, and the elastic rubber layer is used for being attached to the electromagnetic imaging plate.

In the variable information digital flexographic printing apparatus provided by the present invention, there may be further provided the features of: wherein, picture and text printing mechanism still includes printing ink coating roll control and printing pressure roller control, printing ink coating roll control is connected with printing ink coating roll, be used for driving printing ink coating roll, printing pressure roller control is connected with printing pressure roller, be used for driving printing pressure roller, material area conveying mechanism includes coiling motor, unreeling motor, two lead the paper roll cylinder and set gradually and the wind-up shaft that is parallel to each other, at least two lead paper roll and unreel the axle, the both ends in printing material area cup joint respectively on wind-up shaft and unreel the axle and walk around the paper roll in proper order, coiling motor is used for driving wind-up shaft synchronous rotation, unreeling motor is used for driving unreeling axle and wind-up shaft synchronous rotation, two lead the paper roll cylinder respectively with lead two in the paper roll and be connected, be.

In the variable information digital flexographic printing apparatus provided by the present invention, there may be further provided a feature further comprising: and the air pump is used for being communicated with the groove and pumping out 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.

In the variable information digital flexographic printing apparatus provided by the present invention, there may be further provided a feature further comprising: the control processing device is in communication connection with the material belt conveying mechanism, the particle image-text forming mechanism, the image-text printing mechanism, the air pump and the particle clearing mechanism, is used for controlling the material belt conveying mechanism, the particle image-text forming mechanism, the image-text printing mechanism, the air pump and the particle clearing mechanism, and comprises an imaging magnetic head control part, a material belt winding control part, a particle coating roller control part, an electromagnetic imaging plate control part, an air pump control part, an ink coating roller control part, a material belt lifting control part, a printing pressure roller control part and a particle clearing control part.

The invention also provides a printing mode of the variable information digital flexible plate printing equipment, which is characterized by comprising the following steps: step 1, an imaging magnetic head control part generates a magnetization pulse signal according to dot matrix data information of a preset image and text, and generates an imaging magnetic head driving signal and a magnetic flux generating signal according to the magnetization pulse signal; step 2, the imaging magnetic head control part transmits the magnetization pulse signal to the imaging magnetic head, the imaging magnetic head generates magnetic flux distribution corresponding to the preset hot stamping image on the imaging magnetic head according to the magnetization pulse signal and the magnetic flux generation signal, meanwhile, the imaging magnetic head control part transmits an imaging magnetic head driving signal to the imaging magnetic head transmission control part, the imaging magnetic head is driven to move above the electromagnetic imaging plate, the imaging magnetic head and the electromagnetic imaging plate form a closed magnetic circuit, so that latent magnetic images and texts corresponding to the preset images and texts are formed on the electromagnetic imaging plate, and then the imaging magnetic head control part generates a magnetic flux distribution generation completion signal; step 3, the material belt winding control part generates a signal for controlling unwinding shafts according to the magnetic flux distribution generation finishing signal and transmits the signal to a winding motor and an unwinding motor to control winding shafts to start winding and unwinding shafts to start unwinding; step 4, the particle coating roller control part generates a particle coating roller driving signal according to the magnetic flux distribution generation completion signal and transmits the particle coating roller driving signal to the particle coating transmission control part, the particle coating transmission control part drives the particle coating roller to rotate in the particle containing box to adsorb imaging particles, then the particle coating roller drives the particle coating roller to reciprocate on the surface of the electromagnetic imaging plate, the imaging particles are transferred to latent magnetic images and texts on the electromagnetic imaging plate from the particle coating roller to obtain particle images and texts, and then the particle coating roller control part generates a particle image and text generation completion signal; step 5, the electromagnetic imaging plate control part generates an imaging plate driving signal according to the particle image-text generation finishing signal, drives the imaging plate driving cylinder to move upwards from the initial position of the imaging plate driving cylinder, so that the electromagnetic imaging plate is in contact with the printing cloth, and then the electromagnetic imaging plate control part generates a contact finishing signal; step 6, the air pump control part generates an air pump driving signal according to the contact completion signal, drives the air pump to start air pumping, enables the printing cloth to be tightly attached to the surface of the electromagnetic imaging plate, enables the surface of the printing cloth to form a convex part, and then generates an air pumping completion signal; step 7, the ink coating roller control part generates an ink coating roller driving signal according to the air exhaust completion signal, controls the ink coating roller control part to drive the ink coating roller to rotate to dip ink in the ink box and then move on the printing cloth, so that the ink is coated on the convex part, and then generates an ink coating completion signal; step 8, the material belt lifting control part generates a material belt descending signal according to the ink coating completion signal, drives a paper guide roller cylinder to descend, drives the printing material belt to descend to be in contact with the printing cloth, and then generates a material belt contact completion signal; step 9, the printing pressure roller control part generates a printing pressure roller control signal according to the material belt contact completion signal, drives the printing pressure roller control part to drive the printing pressure roller to roll the printing material belt, so that the printing ink is transferred to the printing material belt to form a preset image-text on the printing material belt, and then the printing pressure roller control part generates an image generation completion signal; step 10, the electromagnetic imaging plate control part drives the imaging plate to drive the cylinder to move downwards according to the image generation finishing signal, so that the electromagnetic imaging plate returns to the initial position, and then a cylinder return signal is generated; step 11, the imaging magnetic head control part generates a reverse magnetic field signal according to the cylinder return signal, transmits the reverse magnetic field signal to the imaging magnetic head transmission control part, drives the imaging magnetic head to move above the electromagnetic imaging plate and generate a reverse magnetic field, eliminates the latent magnetic image-text on the electromagnetic imaging plate, and then the imaging magnetic head control part generates a latent magnetic image-text elimination signal; step 12, the particle removal control part eliminates a magnetic brush wheel driving signal according to the magnetic latency image, drives a magnetic brush wheel driving motor to drive a magnetic brush wheel to roll on the surface of electromagnetic imaging so as to remove imaging particles, and generates a removal completion signal; and step 13, the material belt lifting control part generates a material belt lifting signal according to the cleaning completion signal, drives the paper guide roller cylinder to lift, and drives the printing material belt and the paper guide roller to return.

Action and Effect of the invention

The variable information digital flexible plate printing equipment is used for printing preset pictures and texts on the surface of a printing material belt, the material belt conveying mechanism conveys the printing material belt, the particle picture and text forming mechanism generates raised particle pictures and texts according to the preset pictures and texts, and the picture and text printing mechanism is arranged between the material belt conveying mechanism and the particle picture and text forming mechanism and prints the preset pictures and texts on the surface of the printing material belt according to the particle pictures and texts. The printing method comprises the steps that an imaging magnetic head is utilized to generate latent magnetic pictures and texts corresponding to preset pictures and texts on an electromagnetic imaging plate, then the latent magnetic pictures and texts adsorb imaging particles to form raised particle pictures and texts, a printing cloth is attached to the electromagnetic imaging plate to form raised parts corresponding to the particle pictures and texts, an ink coating roller is used for dipping ink and coating the ink on the raised parts of the printing cloth, and when the printing material belt is in contact with the printing cloth with the ink, a printing pressure roller is used for rolling the printing material belt, so that the ink is transferred onto the printing material belt, and the preset pictures and texts are formed on the printing material belt.

According to the printing mode of the variable information digital flexographic printing equipment provided by the invention, digital image-text information is converted into a latent magnetic image-text to be generated on the surface of an electromagnetic imaging plate by a magnetic imaging principle, the latent magnetic image-text on the upper surface of the electromagnetic imaging plate is converted into three-dimensional image-text information by using solid particles, and then the image-text information of the solid particles is converted into displacement image-text information on the surface of printing cloth, so that the digital flexographic printing plate is manufactured, and finally, the circular flattening mode is adopted for printing, so that the flexographic printing with variable printing information is realized, and only the preset image-text needs to be changed without replacing the flexographic printing plate.

Drawings

FIG. 1 is a schematic block diagram of a variable information digital flexographic printing apparatus in an embodiment of the present invention;

FIG. 2 is a schematic cross-sectional view of an electromagnetic imaging plate in an embodiment of the invention;

FIG. 3 is a schematic view of the surface structure of an electromagnetic imaging plate in an embodiment of the invention;

FIG. 4 is a schematic diagram of an imaging head structure and process of magnetization in an embodiment of the present invention;

FIG. 5 is a schematic structural view of a particle housing box and a particle applying roller in an embodiment of the present invention;

FIG. 6 is a schematic view of the structure of an ink cartridge and an ink applying roller in an embodiment of the present invention;

FIG. 7 is a schematic structural view of a particle removal mechanism in an embodiment of the present invention;

FIG. 8 is a schematic diagram of the operation of a variable information digital flexographic printing apparatus in an embodiment of the present invention; and

fig. 9 is a partially enlarged view of fig. 8.

Detailed Description

In order to make the technical means, the creation features, the achievement purposes and the effects of the invention easy to understand, the variable information digital flexible plate printing equipment of the invention is specifically described below by combining the embodiment and the attached drawings.

< example >

Fig. 1 is a schematic configuration diagram of a variable information digital flexographic printing apparatus in an embodiment of the present invention.

As shown in fig. 1, a variable information digital flexographic printing apparatus (hereinafter referred to as a flexographic printing apparatus) 100 for printing a predetermined pattern on a surface of a printing material tape includes a base (not shown), a tape feeding mechanism, a particle pattern forming mechanism, a pattern printing mechanism, a particle removing mechanism 50, an air pump 40, and a control processing device 60. The print tape 70 may be a paper or film tape.

The base is a frame structure of the flexible printing apparatus for carrying and installing the rest of the components of the flexible printing apparatus 100 in this embodiment, and the control processing device 60 is respectively connected in communication with the tape feeding mechanism, the particle image forming mechanism, the image-text printing mechanism, the particle removing mechanism 50 and the air pump 40.

The tape transport mechanism is mounted on the base for transporting the print tape 70, and in this embodiment, the predetermined feeding direction is the direction X.

The material belt conveying mechanism comprises an unreeling motor (not marked in the drawing), a reeling motor (not marked in the drawing), a first paper guide roller cylinder 11A, a second paper guide roller cylinder 11B, an unreeling shaft 12, two paper guide rollers (namely a first paper guide roller 13A and a second paper guide roller 13B) and a reeling shaft 14, wherein the unreeling shaft 12, the two paper guide rollers (11B) and the unreeling shaft are sequentially arranged in the X direction and are mutually parallel. In practical application, there may be several paper guide rollers, two of which are controlled by air cylinder to move separately.

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

The two ends of the printing tape 70 are respectively sleeved on the unwinding shaft 12 and the winding shaft 13 and sequentially pass by the first paper guide roller 13A and the second paper guide roller 13B.

The printing tape 70 located between the first paper guide roller 13A and the second paper guide roller 13B is used as a printing portion.

The unwinding shaft 12 is sleeved with an unused printing tape 70, and the winding shaft 13 is used for recovering the printing tape 70 after printing by rotation.

The output of unreeling motor is installed on unreeling axle 12 for the drive unreels axle 12 and carries out anticlockwise rotation, and the output of rolling motor is installed on rolling axle 13, is used for the drive rolling axle 13 to carry out anticlockwise rotation.

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

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 synchronously ascend or descend, and drives the two paper guide rollers to synchronously move.

The particle picture and text forming mechanism is arranged on the base and used for generating raised particle picture and text according to preset picture and text, and comprises 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 part 26, an imaging magnetic head 27 and an imaging magnetic head transmission control part 28.

The electromagnetic imaging plate 21 is located at a predetermined position below the printing position of the printing material belt 70, and the electromagnetic imaging plate 21 is mounted on the base 22 and connected with the base 22 through bolts or fastening fit.

The output end of the imaging plate driving cylinder 23 is mounted on the lower surface of the base 22, and the electromagnetic imaging plate 21 and the base 22 are driven under the control of the control processing device 60 to raise the electromagnetic imaging plate 21 from a predetermined position to a desired position or to return to a predetermined position.

FIG. 2 is a schematic cross-sectional view of an electromagnetic imaging plate in an embodiment of the invention; fig. 3 is a schematic view of the surface structure of an electromagnetic imaging plate in an embodiment of the present invention.

As shown in fig. 2 and 3, the electromagnetic imaging plate 21 is a multi-layer structure, and includes a friction-resistant layer 211, a ferromagnetic coating layer 212, a metal layer 213, and a plate base layer 214, which are sequentially bonded together.

The friction resistant layer 211 is located on the uppermost layer and has four rectangular grooves 215 at the edges of the surface that are in cross communication with each other. The numeral "1234" on the surface of the friction-resistant layer 211 represents a predetermined pattern.

The ferromagnetic coating 212 is a soft and hard ferromagnetic coating and the plate base layer 214 is non-magnetic.

As shown in fig. 1, the imaging head 27 is disposed near the electromagnetic imaging plate 21 and is fixedly connected to the imaging head actuator control 28, and the imaging head actuator control 28 drives the imaging head 27 to move above the electromagnetic imaging plate 21 or return to its original position under the control of the control processing device 60.

FIG. 4 is a schematic diagram of an imaging head structure and a magnetizing process in an embodiment of the invention.

As shown in fig. 4, the imaging magnetic head 27 includes an imaging head core 271 and an energizing coil 272.

In this embodiment, the imaging head core 271 is an inverted "U" shaped silicon steel core with a vertically downward opening, having narrow 2711 and wide 2712 poles. The energizing coil 272 is disposed around the outside of the imaging head core 271.

When a magnetization pulse signal is applied to the energizing coil 272, a magnetic flux distribution corresponding to a predetermined pattern is generated in the imaging head core 271. When the imaging head 27 is moved above the electromagnetic imaging plate 21, the imaging head 27 forms a closed magnetic circuit with the electromagnetic imaging plate 21. The narrow 2711 and wide 2712 poles produce different degrees of magnetization effects on the surface of the electromagnetic imaging plate 21 by means of magnetic flux variations, and latent magnetic patterns corresponding to predetermined pattern information are generated in the ferromagnetic coating 212 in the electromagnetic imaging plate 21.

FIG. 5 is a schematic structural view of a particle housing box and a particle coating roller in an embodiment of the present invention.

As shown in fig. 1, 5, a first particle housing box 24A and a second particle housing box 24B are respectively mounted in the vicinity of both ends of the electromagnetic imaging plate 21. In other embodiments, the particle housing box may be one, mounted near one end of the electromagnetic imaging plate 21.

The first particle housing box 24A is identical in structure and function to the second particle housing box 24B, and only the structure of the first particle housing box 24A will be described herein.

The first particle housing box 24A is open at the upper end and houses imaging particles 241 that can be magnetized under an applied magnetic field. The imaging particles 241 are magnetic powder, and may be, but not limited to, iron powder, cobalt powder, nickel powder, or powder of an alloy of two or three elements of iron, cobalt, and nickel. In this example, the imaging particles are iron powder.

The bottom of the containing case body 243 of the first particle containing case 24A is provided with an attracting coil 242, and the attracting coil 242 generates a magnetic field after energization to magnetically attract the imaging particles 241 by the particle coating roller 25 positioned at the opening of the first particle containing case 24A.

The particle coating transmission control member 26 is a rack transmission structure and is fixedly connected with the particle coating roller 25, and under the control of the control processing device 60, the particle coating transmission control member 26 moves, so that the particle coating roller 25 is driven to rotate to adsorb the imaging particles 241, then slowly move to the surface of the electromagnetic imaging plate 21, and reciprocate on the surface. The adsorption force of the latent magnetic image-text of the electromagnetic imaging plate 21 to the imaging particles 241 is greater than the adsorption force of the particle coating roller 25 to the iron powder, so that the imaging particles 241 are adsorbed to the latent magnetic image-text of the electromagnetic imaging plate 21, and a raised particle image-text corresponding to the latent magnetic image-text is formed on the electromagnetic imaging plate 21, and the image is the digital information "1234" shown in fig. 3.

The number of the particle coating roll 25 may be one or plural, and is determined depending on factors such as a design speed and an ink thickness. When the printing area printing ink is thicker, the strength of the corresponding latent magnetic image adsorption particulate matter is stronger, the single coating roller is adopted, the particles can not be sufficient for walking, multiple times of walking are needed, and the coating amount and the walking efficiency can be increased if multiple coating rollers are adopted for simultaneous coating.

The particle-coating roller 25 adsorbs the imaging particles 241 from within the first particle housing box 24A, and when the surface of the electromagnetic imaging plate 21 moves to the second particle housing box 24B, the imaging particles 241 can be adsorbed from within the second particle housing box 24B without having to move again to the first particle housing box 24A to re-adsorb the imaging particles 241.

As shown in fig. 1, the image-text printing mechanism is used for printing predetermined images and texts on the surface of the printing material belt 70 according to raised particle images and texts, and comprises a printing cloth 31, two ink cartridges (a first ink cartridge 32A and a second ink cartridge 32B), an ink applying roller 33, an ink applying roller control member 34, a printing pressure roller 35 and a printing pressure roller control member 36.

The printing cloth 31 is unfolded and fixed on the base and is positioned between the electromagnetic imaging plate 21 and the printing material belt 70. The printing cloth 31 is an elastic rubber cloth, and includes an elastic rubber layer and an ink-attracting layer which are attached together, and the elastic rubber layer is used for attaching to the electromagnetic imaging plate 21.

When the electromagnetic imaging plate 21 moves upwards, the electromagnetic imaging plate 21 contacts with the printing cloth 31, and the printing cloth 31 is in an arched state in the image-text area corresponding to the electromagnetic imaging plate 21. Because the air path of the air pump 40 is communicated with the rectangular groove 215, under the control of the control processing device 60, the air pump 40 pumps the air between the electromagnetic imaging plate 21 and the printing cloth 31 through the air path and the rectangular groove 215 on the friction-resistant layer 211, so that the printing cloth 31 is tightly adsorbed on the surface of the electromagnetic imaging plate 21.

Fig. 6 is a schematic structural view of an ink cartridge and an ink applying roller in an embodiment of the present invention.

As shown in fig. 1 and 6, two ink cartridges are respectively disposed near both ends of the printing cloth 31, and the two ink cartridges have the same structure and function.

The ink cartridge includes a cartridge body 321 and two scrapers 322 at openings of the cartridge body 321, the two scrapers 322 forming an upper end opening capable of accommodating the ink applying roller 33. The cartridge body 321 is for containing ink 323.

The ink applying roller 33 is an anilox roller. The ink coating roller control part 34 is a transmission structure composed of gears and connecting rods, is fixedly connected with the ink coating roller 33, and is used for driving the ink coating roller 33 to rotate and move.

Under the control of the control processing device 60, the ink applying roller control member 34 moves, so that the ink applying roller 33 is driven to rotate to dip ink from the ink box, and then moves on the surface of the printing cloth 31, and the ink on the ink applying roller 33 is applied to the convex parts of the printing cloth 31.

When the ink applying roller 33 moves from one end of the printing cloth 31 to the other end, if the ink is required to be continuously dipped, the ink can be dipped from the ink box from the position where the ink is currently located without returning. When the ink application is complete, the ink application roller control member 34 may drive the ink application roller 33 back to any of the ink cartridges.

The printing pressure roller control member 36 is a transmission structure composed of gears and links, is fixedly connected to the printing pressure roller 35, and is used for the rotation and reciprocation of the printing pressure roller 35. The printing pressure roller 35 is located above the printing material web 70.

When the printing material belt 70 descends to contact with the printing cloth 31 with the ink, the printing pressure roller control member 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 parts to the printing material belt 70 to form the preset patterns on the printing material belt, and the image transfer is completed.

After the graphic information is transferred to the printing material belt 70, the electromagnetic imaging plate 21 returns to the initial position, the control processing device 60 sends a signal to the imaging magnetic head transmission control part 28 and the particle removing mechanism 50, so that the imaging magnetic head 27 moves on the surface of the electromagnetic imaging plate 21, a reverse current during imaging is introduced into the imaging magnetic head 27 to form a reverse magnetic field, the latent magnetic graphic on the ferromagnetic coating 212 in the electromagnetic imaging plate 21 is eliminated, then the particle removing mechanism 50 removes particles on the surface of the electromagnetic imaging plate 21, a complete ink transfer process is completed, and the next round of ink transfer can be performed by repeating the above steps.

Fig. 7 is a schematic structural view of a particle removing mechanism in an embodiment of the present invention.

As shown in fig. 1 and 7, the particle removing mechanism 50 includes a magnetic brush wheel 51, a removing box 52, and a removing control member.

The clear control member may be the imaging magnetic head driving control member 28, or may be a control member having the same structure as the imaging magnetic head driving control member 28, and in this embodiment, both the imaging magnetic head driving control member 28 and the magnetic brush wheel 51 are juxtaposed with the imaging magnetic head 27 and are controlled by the imaging magnetic head driving control member 28.

The imaging head actuator control 28 drives the magnetic brush wheel drive motor 52 to roll on the surface of the electromagnetic imaging plate 21 to remove particles.

The cleaning box 52 has an opening facing downward and a cleaning coil 521 provided at the top. The magnetic brush wheel 51 is installed inside the cleaning box 52, and has a plurality of bristles on the surface, and in this embodiment, the plurality of bristles are uniformly distributed along the circumferential direction 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. After the cleaning coil 521 is electrified, a magnetic field is generated, so that the magnetic brush wheel 51 generates magnetism, particles on the surface of the electromagnetic imaging plate 21 are adsorbed, and the particle images and texts are cleaned. The magnetic brush wheel 51 may be plural or single.

FIG. 8 is a schematic diagram of the operation of a variable information digital flexographic printing apparatus in an embodiment of the present invention; fig. 9 is a partially enlarged view of fig. 8.

As shown in fig. 8 and 9, the control processing device 60 is in communication connection with the tape feeding mechanism, the particle image-text forming mechanism, the image-text printing mechanism, the air pump 40, and the particle cleaning mechanism 50, and includes an imaging head control portion, a tape winding control portion, a particle coating roller control portion, an electromagnetic imaging plate control portion, an air pump control portion, an ink coating roller control portion, a tape lifting control portion, a printing pressure roller control portion, and a particle cleaning control portion.

The printing mode of the variable information digital flexographic printing equipment comprises the following steps:

and a pre-conversion step, namely converting the image-text information to be printed, namely the preset image-text, into dot matrix data information after passing through a Raster Image Processor (RIP).

Step 1, the imaging magnetic head control part generates a magnetization pulse signal according to the dot matrix data information of the preset image and text, and generates an imaging magnetic head driving signal and a magnetic flux generating signal according to the magnetization pulse signal.

And 2, the imaging magnetic head control part transmits the magnetization pulse signal to the imaging magnetic head, the imaging magnetic head generates magnetic flux distribution corresponding to the preset hot stamping image on the imaging magnetic head according to the magnetization pulse signal and the magnetic flux generation signal, meanwhile, the imaging magnetic head control part transmits an imaging magnetic head driving signal to the imaging magnetic head transmission control part, the imaging magnetic head is driven to move above the electromagnetic imaging plate, the imaging magnetic head and the electromagnetic imaging plate form a closed magnetic circuit, so that latent magnetic images and texts corresponding to the preset images and texts are formed on the electromagnetic imaging plate, and then the imaging magnetic head control part generates a magnetic flux distribution generation finishing signal.

And 3, the material belt winding control part generates a signal for controlling unwinding shafts according to the magnetic flux distribution generation finishing signal and transmits the signal to the winding motor and the unwinding motor to control the winding shafts to start winding and the unwinding shafts to start unwinding.

And 4, generating a particle coating roller driving signal by the particle coating roller control part according to the magnetic flux distribution generation completion signal and transmitting the particle coating roller driving signal to the particle coating transmission control part, wherein the particle coating transmission control part drives the particle coating roller to rotate in the particle containing box to adsorb imaging particles, and then the particle coating roller driving signal reciprocates on the surface of the electromagnetic imaging plate, the imaging particles are transferred to latent magnetic images and texts on the electromagnetic imaging plate from the particle coating roller to obtain particle images and texts, and then the particle coating roller control part generates a particle image and text generation completion signal.

And 5, generating an imaging plate driving signal by the electromagnetic imaging plate control part according to the particle image-text generation finishing signal, driving the imaging plate driving cylinder to move upwards from the initial position of the imaging plate driving cylinder, enabling the electromagnetic imaging plate to be in contact with the printing cloth, and then generating a contact finishing signal by the electromagnetic imaging plate control part.

And 6, generating an air pump driving signal by the air pump control part according to the contact completion signal, driving the air pump to start air pumping to enable the printing cloth to be tightly attached to the surface of the electromagnetic imaging plate so that a convex part is formed on the surface of the printing cloth, and then generating an air pumping completion signal by the air pump control part.

And 7, generating an ink coating roller driving signal by the ink coating roller control part according to the air exhaust completion signal, controlling the ink coating roller control part to drive the ink coating roller to rotate to dip ink in the ink box and then move on the printing cloth so that the ink is coated on the convex part, and generating an ink coating completion signal by the ink coating roller control part.

Step 8, the material belt lifting control part generates a material belt descending signal according to the ink coating completion signal, drives a paper guide roller cylinder to descend, drives the printing material belt to descend to be in contact with the printing cloth, and then generates a material belt contact completion signal;

and 9, generating a printing pressure roller control signal by the printing pressure roller control part according to the material belt contact completion signal, driving the printing pressure roller control part to drive the printing pressure roller to roll the printing material belt, so that the printing ink is transferred to the printing material belt to form a preset image-text on the printing material belt, and then generating an image generation completion signal by the printing pressure roller control part.

And step 10, the electromagnetic imaging plate control part drives the imaging plate to drive the cylinder to move downwards according to the image generation finishing signal, so that the electromagnetic imaging plate returns to the initial position, and then a cylinder return signal is generated.

And step 11, generating a reverse magnetic field signal by the imaging magnetic head control part according to the cylinder return signal, transmitting the reverse magnetic field signal to the imaging magnetic head transmission control part, driving the imaging magnetic head to move above the electromagnetic imaging plate and generate a reverse magnetic field, eliminating the latent magnetic image text on the electromagnetic imaging plate, and then generating a latent magnetic image text elimination signal by the imaging magnetic head control part.

And step 12, the particle removal control part eliminates the magnetic brush wheel driving signal according to the magnetic image eliminating signal, drives a magnetic brush wheel driving motor to drive a magnetic brush wheel to roll on the surface of the electromagnetic imaging so as to remove the imaging particles, and generates a removal finishing signal.

And step 13, the material belt lifting control part generates a material belt lifting signal according to the cleaning completion signal, drives the paper guide roller cylinder to lift, and drives the printing material belt and the paper guide roller to return.

Effects and effects of the embodiments

The variable information digital flexible plate printing equipment is used for printing preset pictures and texts on the surface of a printing material belt, the material belt conveying mechanism conveys the printing material belt, the particle picture and text forming mechanism generates raised particle pictures and texts according to the preset pictures and texts, the picture and text printing mechanism is arranged between the material belt conveying mechanism and the particle picture and text forming mechanism, and the preset pictures and texts are printed on the surface of the printing material belt according to the particle pictures and texts. The printing method comprises the steps that an imaging magnetic head is utilized to generate latent magnetic pictures and texts corresponding to preset pictures and texts on an electromagnetic imaging plate, then the latent magnetic pictures and texts adsorb imaging particles to form raised particle pictures and texts, a printing cloth is attached to the electromagnetic imaging plate to form raised parts corresponding to the particle pictures and texts, an ink coating roller is used for dipping ink and coating the ink on the raised parts of the printing cloth, and when the printing material belt is in contact with the printing cloth with the ink, a printing pressure roller is used for rolling the printing material belt, so that the ink is transferred onto the printing material belt, and the preset pictures and texts are formed on the printing material belt. The flexographic printing equipment converts digital image-text information into latent magnetic image-text information by adopting a magnetic imaging principle to be generated on the surface of an electromagnetic imaging plate, converts the latent magnetic image-text information on the upper surface of the electromagnetic imaging plate into three-dimensional image-text information by using solid particles, and converts the solid particle image-text information into displacement image-text information on the surface of an elastic body by using the elastic action of printing cloth, thereby realizing the manufacture of a digital flexographic printing plate.

Because the electromagnetism formation of image board surface of this embodiment is fluted, the gas circuit intercommunication of recess and air pump, when electromagnetism formation of image board and elasticity rubber cloth contact, adopt the negative pressure mode, take out the air between the two and leave, make the surface displacement information of elasticity rubber cloth also be protruding position more obvious. Meanwhile, the elastic rubber cloth comprises an elastic rubber layer and an ink-attracting layer which are attached together, the elastic rubber layer is attached to the electromagnetic imaging plate, and the ink-attracting layer enables ink to be coated more easily.

Because the imaging magnetic head of this embodiment can form the reverse magnetic field, eliminates original latent magnetic image and text to this embodiment still includes granule clearance mechanism, and granule clearance mechanism includes magnetism brush wheel and clearance control piece, and the clearance control piece drives magnetism brush wheel and clears away the imaging granule, conveniently generates next image.

Because the imaging particles of this embodiment are capable of magnetization under an applied magnetic field, they are readily applied to the surface of an electromagnetic imaging plate.

The above embodiments are preferred examples of the present invention, and are not intended to limit the scope of the present invention.