CN113442555A - Flexible plate printing machine with accurate color register and control method - Google Patents

Flexible plate printing machine with accurate color register and control method Download PDF

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Publication number
CN113442555A
CN113442555A CN202110845685.XA CN202110845685A CN113442555A CN 113442555 A CN113442555 A CN 113442555A CN 202110845685 A CN202110845685 A CN 202110845685A CN 113442555 A CN113442555 A CN 113442555A
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tension
printing
component
roller
isolation
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CN113442555B (en
Inventor
丁廷成
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Nanjing Bangcheng Technology Co ltd
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Nanjing Bangcheng Technology Co ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F5/00—Rotary letterpress machines
    • B41F5/24—Rotary letterpress machines for flexographic printing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F13/00—Common details of rotary presses or machines
    • B41F13/08—Cylinders
    • B41F13/10—Forme cylinders
    • B41F13/12—Registering devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F23/00—Devices for treating the surfaces of sheets, webs, or other articles in connection with printing
    • B41F23/04—Devices for treating the surfaces of sheets, webs, or other articles in connection with printing by heat drying, by cooling, by applying powders
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F33/00—Indicating, counting, warning, control or safety devices
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Inking, Control Or Cleaning Of Printing Machines (AREA)

Abstract

The invention relates to the technical field of flexible package printing, in particular to a flexible plate printing machine with accurate color register. The method comprises the following steps: the unreeling part is used for supplying a coiled material to be printed; a printing unit for printing ink on the printing material supplied from the unwinding unit; the rolling component is used for rolling the printing component and printing the printing material; a controller; wherein the printing unit comprises at least two printing units which are arranged in a linear manner in the spatial distribution. The printing units are distributed, the tension isolating roller group is arranged to limit the change of the tension of the printing material in each printing unit, the tension monitoring component is connected to the output end of each printing unit, the conveying speed of the tension isolating roller group to the printing material is adjusted in real time through the feedback of the tension, and the printing material in each printing unit is controlled to be transferred and color-registered at the same tension, so that the material is not deformed during color registration, and the color registration accuracy of each printing unit is ensured.

Description

Flexible plate printing machine with accurate color register and control method
Technical Field
The invention relates to the technical field of flexible package printing, in particular to a flexible plate printing machine with accurate color register and a control method.
Background
At present, a printing machine mainly comprises a roll feeding part, a feeding traction part, a printing part, a receiving traction part and a rolling part.
Generally, a printing portion of multicolor printing comprises a plurality of printing units, and particularly, in the multicolor printing process of flexible printing materials, the flexible printing materials (such as packaging films) are subjected to external forces such as stretching, compression, friction and the like, so that the films are deformed, and when the deformed bodies are present in each printing unit, defects such as overlapping, displacement, deformation and the like of each color register pattern occur (shown in a combined manner in fig. 1).
The printing part of the satellite flexo printing machine comprises a central cylinder with a large diameter and transfer printing units distributed on the periphery of the central cylinder, and is characterized in that the printing part is attached to the periphery of the central cylinder (shown in the attached figure 2), and printing materials do not deform in the whole printing interval (shown in the figure, the arc length is R length interval), so that in the fields of flexible package and paper printing, a planetary printing machine is generally adopted for printing flexible materials at present, and the satellite flexo printing machine technology in China is blank, can only be introduced from abroad, and is expensive.
In addition to this, the satellite flexo printing machine has the following drawbacks:
in the aspect of processing and assembling: the diameter of the central roller is positively correlated with the number of the color register groups, and when the number of the color register groups is large, the diameter of the central roller is generally large, so that the central roller has high requirements on processing precision, assembly difficulty and processing environment. Resulting in high cost and difficult maintenance.
In the aspect of production: because the size of the central roller is large, the positions of the printing unit and the central roller are relatively fixed, the number of color groups can only be reduced if the color groups cannot be increased, and the roller is difficult to replace; the printing units are small in distance, the drying mechanisms are not easy to independently arrange, the printing ink is not easy to fix, and a high-power drying mechanism is generally arranged at a rolling position, so that high power consumption is still needed even if a small number of colors are overprinted; the central roller has large size and high driving power, so that the energy consumption is further high; in addition, the operation space of workers is limited, and when the color register or the printing quality is in problem, the problem is difficult to find in time; all the printing units are connected in series around the central roller, and when the central roller fails, the printing units need to be stopped for maintenance, so that the continuous production degree is low, and the fault tolerance rate is low.
Prior art documents:
patent document 1: CN109263245A full servo satellite type flexible plate printing machine
Patent document 2: CN106240140A satellite type eight-color flexographic printing unit
Disclosure of Invention
The invention aims to provide a flexographic printing machine with accurate color register, which comprises:
the unreeling part is used for supplying a coiled material to be printed;
a printing unit for printing ink on the printing material supplied from the unwinding unit;
the rolling component is used for rolling the printing component and printing the printing material;
a controller;
wherein the printing unit comprises at least two printing units which are linearly arranged in spatial distribution, each printing unit prints ink of one color on a printing material, and each printing unit comprises:
the printing device comprises a first tension isolation component, a transfer printing mechanism, a tension detection component and a drying mechanism, wherein the first tension isolation component, the transfer printing mechanism, the tension detection component and the drying mechanism are sequentially arranged along the feeding direction of a printing material, the first tension isolation component is arranged to control the conveying speed of the printing material, the transfer printing mechanism is used for transferring printing ink to the printing material, the tension detection component is used for detecting the tension generated when the printing material passes through, and the drying mechanism is used for drying the printing ink printed on the surface of the printing material by the transfer printing mechanism;
the guide rollers are used for defining a transmission route of the printing material so that the printing material sequentially passes through the first tension isolation part, the transfer printing mechanism, the tension detection part and the drying mechanism;
the controller is set to adjust the conveying speed of the first tension isolating component in the printing unit to the printing materials according to the tension of the printing materials detected by the tension detecting components, so that the printing materials can keep consistent tension when the printing units are transferred.
Preferably, a plurality of the printing units are linearly arranged on the ground, the transfer mechanism and the drying mechanism are distributed up and down in space, the drying mechanism is positioned above the transfer mechanism, and an operation space for a person to pass through is formed between every two printing units.
Preferably, the transfer mechanism comprises an ink box, a doctor blade, an anilox roller and a plate roller, wherein the doctor blade is used for transferring ink in the ink box to the surface of the anilox roller, and the anilox roller is used for transferring ink to the surface of the plate roller.
Preferably, the transfer mechanism is movably arranged, can be close to or far away from a transmission line of the printing material, and has a printing position and a maintenance position, when the printing mechanism is at the printing position, the ink on the plate roller is transferred to the surface of the printing material, when the printing mechanism is at the maintenance position, the plate roller is far away from the printing material, and a maintenance space is formed between the plate roller and the printing material.
Preferably, the tension detecting unit includes a pressure roller elastically mounted on the frame, a linear spring for providing an elastic force between the pressure roller and the frame and a displacement sensor for monitoring a relative displacement between the pressure roller and the frame to reflect the tension of the printing material by a displacement between the pressure roller and the frame.
Preferably, the first tensile isolation member includes:
-a glue roller arranged on the non-printing side of the printing material;
-a backing roll, arranged on the printing side of the substrate, which can be servo-driven to control the transport of the substrate at a predetermined speed;
the rubber roller and the back roller are attached to limit the printing material to slide relative to the contact part of the rubber roller and the back roller.
Preferably, the first tension isolation component further comprises a servo motor, an output end of the servo motor is connected with the back roller, and the servo motor is controlled by a controller to output a state so as to adjust the rotating speed of the back roller.
Preferably, the rubber roller is set to be driven to displace so as to form a pressing/pressing-separating state between the rubber roller and the back roller, the rubber roller is attached to the back roller in the pressing state, and the rubber roller is separated from the back roller in the pressing-separating state.
The invention provides another technical scheme, and a method for controlling a flexographic printing machine with accurate color register comprises the following steps:
step 1, arranging a first tension isolating component at the input side of each transfer mechanism, enabling the first tension isolating component to control the conveying speed of a printing material, and arranging a tension detecting component between every two first tension isolating components;
step 2, connecting each first tension isolating component to an independent servo driving component, connecting each tension detecting component in parallel, and setting corresponding relations between the first tension isolating components and the tension detecting components belonging to the same printing unit;
and 3, receiving the tension fed back by each tension detection component in the printing process, and controlling each servo driving component corresponding to the changed tension detection component to adjust the conveying speed of the printing material according to the tension fed back by the tension detection component so as to enable the tension of each printing material to reach a preset state.
Preferably, a tension isolation section is formed between every two first tension isolation components, a second tension isolation component is arranged in each tension isolation section, the second tension isolation component is located on the output side of the tension detection component, the second tension isolation component divides the tension isolation section into a printing section and a non-printing section, and the tension detection component is located in the printing section.
Preferably, the second tensile isolation member and the first tensile isolation member are identical in structure.
The invention provides another technical scheme, and the method for controlling the flexographic printing machine with accurate color register comprises the following steps:
the method comprises the following steps:
step 1, respectively arranging a first tension isolation component and a second tension isolation component on the input side and the output side of each transfer printing mechanism, wherein the tension isolation components are arranged to be capable of adjusting the conveying speed of a printing material, and a tension detection component is arranged between the first tension isolation component and the second tension isolation component;
step 2, connecting each first tension isolation component to an independent servo driving component, connecting each tension detection component in parallel, and setting corresponding relations between the tension isolation components and the tension detection components belonging to the same printing unit;
and 3, receiving the tension fed back by each tension detection component in the printing process, and controlling each servo driving component corresponding to the changed tension detection component to adjust the conveying speed of the printing material according to the tension fed back by the tension detection component so as to enable the tension of the printing material to reach a preset state.
Preferably, in step 2, the first tension isolation member and the tension detection member on the input side of each printing mechanism are provided in a corresponding relationship.
Preferably, in step 3, the tension detected by each tension detecting member is kept the same, so that the printing material is fed into the printing unit with a uniform tension.
Compared with the prior art, the invention has the advantages that:
the printing units are distributed, the tension isolating components are arranged to limit the change of the tension of the printing materials in each printing unit, the tension monitoring points are connected to the output ends of the printing units, the conveying speed of the tension isolating components to the printing materials is adjusted in real time through the feedback of the tension, the printing materials in each printing unit are controlled to be transferred and color-registered at the same tension, and therefore, the materials are not deformed during color registration, and accurate color registration of each printing unit is guaranteed.
The invention adopts the design of distributed printing units, the number of the color register can be increased or decreased according to the requirement, the field only has the length requirement, the assembly difficulty is low, and the maintenance cost is low; in addition, the printing unit is arranged on the ground, the operation space is large, the difficulty of the operation processes such as plate changing and the like is low, and when a fault occurs, the fault can be timely found and processed.
According to the invention, the drying unit is arranged behind each printing unit, so that the printing ink on the printing material can be dried in time, pollution is prevented, the drying effect is good, the environment-friendly water-based printing ink with longer drying time can be adopted, the higher printing speed can be kept, the production efficiency is improved, and the energy is saved and the environment is protected.
The drying units and the printing drive servo are designed independently, when the printing machine runs under a non-full load condition, particularly when the printing machine runs in a less-color overprinting mode, only the corresponding number of drying units and the corresponding number of drive servos need to be opened, and the printing machine has the advantages of low energy consumption and low production cost.
It should be understood that all combinations of the foregoing concepts and additional concepts described in greater detail below can be considered as part of the inventive subject matter of this disclosure unless such concepts are mutually inconsistent. In addition, all combinations of claimed subject matter are considered a part of the presently disclosed subject matter.
The foregoing and other aspects, embodiments and features of the present teachings can be more fully understood from the following description taken in conjunction with the accompanying drawings. Additional aspects of the present invention, such as features and/or advantages of exemplary embodiments, will be apparent from the description which follows, or may be learned by practice of specific embodiments in accordance with the teachings of the present invention.
Drawings
The drawings are not intended to be drawn to scale. In the drawings, each identical or nearly identical component that is illustrated in various figures may be represented by a like numeral. For purposes of clarity, not every component may be labeled in every drawing. Embodiments of various aspects of the present invention will now be described, by way of example, with reference to the accompanying drawings, in which:
FIG. 1 is a schematic representation of a pattern change in a flexible substrate material as tension changes;
FIG. 2 is a schematic view of a printed portion of a prior art satellite flexo press;
FIG. 3 is a schematic diagram of a distributed arrangement of printing units in a prior art satellite flexo press;
FIG. 4 is a schematic view of a register accurate flexographic printing press of the present invention;
FIG. 5 is a block diagram of a printing portion shown in the present invention;
FIG. 6 is a schematic diagram of the pressure sensing configuration of the register accurate flexographic printing press of the present invention;
FIG. 7 is a schematic diagram of a flexographic printing press of the present invention showing accurate register;
fig. 8 is a schematic diagram of a flexographic printing press with accurate register according to another embodiment of the present invention.
Detailed Description
In order to better understand the technical content of the present invention, specific embodiments are described below with reference to the accompanying drawings.
In this disclosure, aspects of the present invention are described with reference to the accompanying drawings, in which a number of illustrative embodiments are shown. Embodiments of the present disclosure are not necessarily intended to include all aspects of the invention. It should be appreciated that the various concepts and embodiments described above, as well as those described in greater detail below, may be implemented in any of numerous ways with any register-accurate flexographic printing press and control method, as the disclosed concepts and embodiments are not limited to any embodiment. In addition, some aspects of the present disclosure may be used alone, or in any suitable combination with other aspects of the present disclosure.
The satellite type flexographic printing machine has the structural characteristics that: a central cylinder 100, and distributed printing units around the circumference of the central cylinder. This type of distribution presents many insurmountable problems, resulting in high procurement and production costs and difficult processing and maintenance. It is therefore desirable to have a distributed arrangement of printing units while maintaining registration accuracy. As shown in connection with fig. 3, the central cylinder 100 is shown as a dummy cylinder, i.e. maintained in the interval of length R, the linear speed of the substrate is maintained the same, i.e. the register of the individual printing units is accurate.
Distributed flexographic printing press
Referring to fig. 4, the present invention is directed to a distributed flexographic printing machine, which is mainly used for printing flexible printing materials, especially thin film materials, and the printing materials are described below by taking a thin film as an example, and the distributed flexographic printing machine mainly includes an unwinding component 1, an unwinding traction 2, a printing component, a winding traction 4, and a winding component 5. The central drum 100 described above is not included.
Unwinding part
The unreeling part 1 is the same as the prior art and is used for storing a film coiled material to be printed and supplying the film coiled material to be printed; in an optional embodiment, the unwinding part 1 comprises a double-station unwinding material roll, the film material to be printed is wound on the material roll, the material change without stopping is realized, the material roll is driven by an unwinding traction 2 to pull out the film material on the feeding roll, and the unwinding traction 2 comprises deviation correction and traction before printing.
Furthermore, the output side of the unwinding part 1 is provided with an unwinding isolation part, and the unwinding isolation part comprises a flexible roller and a rigid roller which are pressed on two sides of the printing material, so that tension is prevented from being continuously transmitted on the printing material, and tension is prevented from being transmitted to a printing process when the unwinding part is unwound. Therefore, the tension change caused by the speed change during unreeling is prevented from influencing the color register.
Printing component
Further, the printing part is used for printing ink on the printing material sent out by the unreeling part 1; since each printing unit prints one color of ink onto the substrate, the printing unit typically includes multiple printing units to facilitate the transfer of different color patterns onto the film, and in an alternative embodiment, shown in connection with FIG. 4, the illustration includes three printing units: a first transfer mechanism 301, a second transfer mechanism 302, and a third transfer mechanism 303. The first transfer mechanism 301 transfers red ink to the film, the second transfer mechanism 302 transfers green ink to the film, and the third transfer mechanism 303 transfers blue ink to the film, thereby realizing three-color printing.
Furthermore, the plurality of printing units are linearly arranged in spatial distribution, and compared with the satellite type printing units, the linearly arranged printing units are increased in number and only extend in a horizontal space, and are not limited by the size of the central roller.
Therefore, the advantages of the distributed flexible plate printing machine are embodied, when the number of the printed colors is increased or decreased, the number of the printing units is increased or decreased in the horizontal direction, and when the process color production of more than six colors is carried out, the advantages are more obvious, the adaptability of the equipment is strong, and higher requirements on production places and assembly processes are not needed.
Printing unit
As shown in connection with fig. 4-5, the printing unit includes: the printing device comprises a first tension isolating component 6, a transfer printing mechanism 3, a tension detecting component 9 and a drying mechanism 7 which are sequentially arranged along the feeding direction of a printing material, wherein the first tension isolating component 6 is arranged to control the conveying speed of the printing material, the transfer printing mechanism 3 is used for transferring printing ink to the printing material, the tension detecting component 9 is used for detecting the tension generated when the printing material passes through, and the drying mechanism 7 is used for drying the printing ink printed on the surface of the printing material by the transfer printing mechanism 3; and a plurality of guide rollers for defining a transport path of the printing material so that the printing material passes through the first tension isolation member 6, the transfer mechanism 3, the tension detection member 9, and the drying mechanism 7 in this order.
The first tension isolating component 6 arranged at the input side of the transfer mechanism 3 limits the tension in the previous color group to be transmitted to the next color group, and the first tension isolating component 6 controls the film to pass through the transfer mechanism 3 at a preset conveying speed to keep the tension of the film stable, and further detects the tension of the film through the tension detecting component 9 to adjust the conveying speed of the film according to the tension so as to keep the film conveyed in a constant tension state.
Because the ink printed on the film by each transfer mechanism 3 can be dried in time by the drying mechanism 7 arranged on the output side of the transfer mechanism 3, the pollution of the ink to the film material is prevented, and compared with a satellite type drying mode with a rear drying mechanism, the invention has good drying effect, can adopt the water-based ink with longer drying time, can keep higher printing speed, improves the production efficiency, saves energy and protects environment, particularly under the condition of less color printing, one drying mechanism 7 is started for one color printing, and two drying mechanisms 7 are started for two color printing, thereby greatly saving electric energy.
Further, a plurality of printing units are linearly arranged on the ground, the transfer mechanism 3 and the drying mechanism 7 are spatially distributed up and down, the drying mechanism 7 is located above the transfer mechanism 3, and as shown in fig. 4, an operation space for a person to pass through is formed between every two printing units.
Thus, compared with the annular distribution of the satellite transfer mechanisms 3 in space, the invention has no convenient maintenance and operation space, and in the invention, operators can conveniently enter the operation space to observe the color register and the printing state of the film, and can timely deal with the color register or the printing problem when finding out the color register or the printing problem.
Transfer printing mechanism
The illustrated transfer mechanism 3 includes an anilox roller 31, a plate roller 32, a doctor blade 33, and an ink cartridge, wherein the anilox roller 31 is responsible for uniformly transferring a certain amount of ink to the plate roller 32, a plurality of tiny concave holes with uniform shapes, namely ink applying holes, are uniformly distributed on the surface of the anilox roller 31, and the ink applying holes play roles of storing ink, homogenizing ink, and quantitatively transferring ink in printing. The surface of the plate roll 32 is treated to form a printing plate having a portion that transfers printing ink and another portion that does not transfer printing ink, for transferring ink to a substrate to form graphic information.
Generally, the doctor blade 33 transfers the ink in the ink cartridge to the inking holes of the anilox roller 31, the anilox roller 31 transfers the ink to the plate roller 32, and the plate roller 32 transfers the ink to the printing material to form graphic information.
In an alternative embodiment, the doctor blade 33 is a closed doctor blade, which reduces ink evaporation and keeps the ink viscosity and cleanness; the scraper cavity is an aluminum alloy section and has a quick replacement function; the ink scraping blade and the cavity sealing block in the closed scraper are easy to replace and convenient to clean; a forward scraper and a reverse scraper are arranged in the scraper cavity, the reverse scraper plays a role in sealing, and the forward scraper plays a role in scraping ink; the scraper has even pressure and convenient adjustment, and the ink supply adopts a heating heat-preservation ink barrel pneumatic double-diaphragm pump.
With reference to fig. 5, the integrated design of anilox roller 31 and plate roller 32 can be slid on a guide rail 35 by a bottom slide 34, the guide rail 35 being fixed to a frame 36 to move away from and towards the backing roller 62, which facilitates the replacement of plate roller 32 for quick replacement or maintenance.
Drying unit
In an alternative embodiment, shown in fig. 4, the drying unit 7 comprises an oven arranged above the transfer mechanism 3 to save space in the horizontal direction, and the guide rollers guide the printed film through the oven in the opposite direction to the arrangement of the plurality of printing units and pass in the oven in a dome shape, and the oven dries the ink on the film in the form of hot air drying.
Therefore, the time for drying the film can be increased, and the occupied area of the oven is saved.
Further, the drying mechanism 7 of each printing unit is configured to be individually turned on/off. The working state of the drying unit 7 in each printing unit can be independently controlled according to the number of the printing units, and the energy consumption is saved when the color register number is small.
First tension isolation component
In the above-mentioned solution, since the tension fluctuation exists during the film transfer, which affects the tension consistency of the different printing units during the printing, the first tension isolation component 6 shown in the figure is intended to isolate the tension transfer of the film material, especially to isolate the tension of the printing material in a manner that two rollers are pressed together, so as to prevent the tension from being transferred between each transfer mechanism 3, thereby improving the color register accuracy.
As shown in connection with fig. 5, further, the first tension separating member 6 is provided on the input or output side (shown as the input side) of each transfer mechanism 3, but must be on the same side of the transfer mechanism 3 to achieve that only one transfer mechanism 3 exists between every two first tension separating members 6 so that the tensions do not interfere with each other.
In an alternative embodiment, the first tension isolation component 6 is a flexible and rigid two rollers, specifically, the first tension isolation component 6 includes a rubber roller 61 (flexible roller) and a back roller 62 (rigid roller), and the rubber roller 61 is preferably arranged on the non-printing side of the printing material; the backing roll 62 is disposed on the print side of the substrate.
Wherein, the rubber roller 61 and the back roller 62 are jointed to limit the printing material to slide relatively relative to the contact part of the rubber roller 61 and the back roller 62. The back roller 62 is set to be servo-driven by a servo motor, and when the rubber roller 61 and the back roller 62 are attached to clamp the film, the back roller 62 rotates to control the printing material to be conveyed at a preset speed.
Further, in order to facilitate the control of the separation/bonding state between the rubber roller 61 and the backing roller 62, the rubber roller 61 is configured to be driven by an automated linear actuator to displace, so as to form a press-fit/separation state between the rubber roller 61 and the backing roller 62.
In an alternative example, the rubber roller 61 is driven by an air cylinder to change the position state relative to the back roller 62, in the pressing state, the rubber roller 61 and the back roller 62 are attached to perform tension isolation, the conveying speed of the film can be actively controlled through the speed regulation of the back roller 62, in the pressing state, the rubber roller 61 and the back roller 62 are separated, and at the moment, the film is in the unloading or non-working state.
Therefore, the back roller 62 cooperates with the rubber roller 61 to press and fix the film, and the tension on the input side and the tension on the output side of the pressing point cannot be mutually transmitted, so that the conveying speed of the film can be actively controlled by controlling the linear speed of the first tension isolation part 6 corresponding to each transfer mechanism 3, and when the linear speed of each first tension isolation part 6 is kept the same, accurate overprinting is realized.
Specifically, the backing roll 62 is made of high-quality alloy steel, and is subjected to multiple times of accurate dynamic balance and surface electroplating treatment, so that the surface is effectively prevented from being etched, the backing roll 62 is supported by a high-precision bearing and is driven by an independent servo motor and a high-precision speed reducer, so that the precision of controlling the linear speed of the film is ensured, and a foundation is laid for accurate color register (namely transfer printing of colored ink) of each unit.
The speed of the film material passing through each transfer mechanism 3 is the same, and the aim of accurate color register is achieved. Further, the controller is connected to the driving end of the servo motor, and the back roll 62 in each transfer mechanism 3 is controlled by the servo motor to rotate at the same rotating speed, so that the tension of the film in the transmission process is kept consistent, and the color register accuracy is ensured.
Compared with a satellite type driving mode, the film is driven by the servo motor connected to the back roller 62 to pass through the transfer printing mechanism 3, when only one color or two colors are overprinted, only the corresponding servo motor needs to be started, and the driving energy consumption and the production cost are reduced.
Tension detection component
In order to further keep the tension of the film constant during conveying and reduce tension variation interference caused by drying, a tension detection component 9 is arranged between every two first tension isolation components 6, and the tension detection component 9 is used for detecting the tension of the printing material between the two first tension isolation components 6.
As shown in fig. 6, in an alternative embodiment, the tension detecting member 9 includes a pressure roller 91 elastically mounted on a frame (not shown), a linear spring 92 provided between the pressure roller 91 and the frame for providing an elastic force between the pressure roller 91 and the frame, and a displacement sensor for monitoring a relative displacement between the pressure roller 91 and the frame.
In this way, the printing material bypasses the pressure roller 91 for conveying, when the tension of the printing material changes, the linear spring 92 is pressed or loosened to form a displacement, and the compression amount and the pressure of the linear spring 92 are in positive correlation, so that the change of the tension of the printing material can be reflected by monitoring the relative displacement between the pressure roller 91 and the frame.
Further, the controller 10 is electrically connected with the tension detection part 9 and the servo motor of the back roller 62, the tension detection part 9 detects the tension of the printing material, and when the tension is smaller than a preset value, the controller 10 controls the corresponding first tension isolation part 6 to reduce the speed, so that the tension is recovered to the preset value.
Specifically, the tension detecting member J of the second coloring unit2When an increase in tension is detectedThe detected pressure signal is transmitted to the controller 10, and the controller 10 controls the first tension isolating part G2The transmission speed of the printing material is improved, so that the tension of the second color registering unit is restored to the preset state again, and the color registering is carried out by keeping constant tension in the whole printing process through the feedback adjustment process so as to keep the accuracy of color registering.
In this way, the printing material is conveyed in a constant tension state by the closed-loop feedback formed between the tension detecting unit 9, the controller 10, and the first tension separating unit 6.
In an alternative embodiment, the tension detecting component 9 may also be a pressure sensor disposed on one of the guide rollers between the two first tension isolating components 6 in the film passing path, and the tension of the film is obtained by the pressure applied to the guide roller.
Controller
Further, as shown in fig. 7, the controller 10 is configured to adjust the conveyance speed of the first tension separating member 6 corresponding to each tension detecting member 9 with respect to the printing material based on the pressure value of each tension detecting member 9, so that the tension of each tension detecting member 9 is kept the same, and the printing material is kept at a uniform tension when the respective transfer mechanisms 3 are transferred.
In alternative embodiments, the controller 10 comprises an industrial personal computer, a single chip microcomputer, or a PLC controller.
In an alternative embodiment, the first set of color units (transfer mechanism Y)1) The first tensile separating member 6 of the input is marked G1First coloring unit (transfer mechanism Y)1) The tension detection member 9 of the output end is marked as J1Second coloring unit (transfer mechanism Y)2) The first tensile separating member 6 of the input is marked G2Second coloring unit (transfer mechanism Y)2) The tension detection member 9 of the output end is marked as J2Third coloring unit (transfer mechanism Y)3) The first tensile separating member 6 of the input is marked G3Third coloring unit (transfer mechanism Y)3) The tension detection member 9 of the output end is marked as J3。
Specifically, the first tensile separating member G1And a tension detecting member J1Setting a corresponding relationship when the tension detecting member J1When the change of the tension is detected, the first tension isolating component G1Adjusting the transport speed of the printing material until the tension returns to the predetermined value; similarly, the first tension isolating member G2And a tension detecting member J2A corresponding relation is set for detecting the component J according to the tension2The detected tension change causes the first tension-isolating member G to move2Controlling the transport speed of the printing material; first tensile force isolation member G3And a tension detecting member J3A corresponding relation is set for detecting the component J according to the tension3The detected tension change causes the first tension-isolating member G to move3The transport speed of the printing material is controlled.
Rolling component
The film printed by the printing part is drawn by a rolling drawing device 4 to be rolled to a rolling part 5, in an optional embodiment, the rolling part 5 comprises an independent double-station rotary disc and a wallboard frame, an air inflation shaft and a safety chuck are adopted for placing the roll, and the roll is transversely adjustable.
Wherein, the input side of rolling traction 4 is provided with an unreeling isolation part, and the unreeling isolation part comprises a flexible roller and a rigid roller which are pressed on two sides of a printing material so as to avoid the continuous transmission of tension on the printing material and prevent the transmission of the tension which is changed during unreeling to the printing process. Therefore, the tension change caused by the speed change during unreeling is prevented from influencing the color register.
[ flexographic printing press control method ]
The invention also provides a technical scheme, and the method for controlling the flexographic printing machine with accurate color register comprises the following steps:
step 1, arranging a tension isolating component at the input side of each transfer mechanism 3, enabling the tension isolating component to control the conveying speed of a printing material, and arranging a tension detecting component between every two tension isolating components;
step 2, connecting each tension isolating component to an independent servo driving component, connecting each tension detecting component in parallel, controlling the tension detected by each tension detecting component to be the same, and setting the corresponding relation between the tension isolating components and the tension detecting components belonging to the same printing unit;
and 3, receiving the tension fed back by each tension detection component in the printing process, and controlling each servo driving component corresponding to the changed tension detection component to adjust the conveying speed of the printing material according to the tension fed back by the tension detection component so as to enable the tension of each tension detection component to reach a preset state.
In an alternative embodiment, a tension isolating component is arranged on the input side of each transfer mechanism 3 by using the first tension isolating component 6 in the scheme, and the first tension isolating component 6 is pressed against the printing material by the rubber roller 61 and the back roller 62 in a pressing state to perform tension isolation; the tension of the film between the two first tension spacer members 6 is detected by a tension detecting member 9, the tension detecting member 9 including a pressure roller 91 elastically mounted on a frame (not shown in the drawings), a linear spring 92 for providing an elastic force between the pressure roller 91 and the frame, and a displacement sensor for monitoring a relative displacement between the pressure roller 91 and the frame.
In this way, the printing material is between the two first tension isolation members 6 and is conveyed around the pressure roller 91, when the tension of the printing material changes, the linear spring 92 is pressed or loosened to form a displacement, and the compression amount and the pressure of the linear spring 92 are positively correlated, so that the change of the tension of the printing material can be reflected by obtaining the relative displacement between the monitoring pressure roller 91 and the frame.
Further, the rotation speed of the back roller 62 is driven by a servo motor to realize the active control of the film conveying speed, and the first tension isolation part 6 at the input end of each color register unit and the tension detection part 9 at the output end are arranged in a corresponding relationship.
Thus, when the tension detecting component of one of the color registering units detects that the tension is increased, the detected pressure signal is transmitted to the controller 10, the controller 10 controls the first tension isolating component corresponding to the tension detecting component to improve the transmission speed of the printing material, and thus, the tension of the film in the color registering unit is restored to the preset state again, and through the feedback adjusting process, the film is kept at constant tension in the whole printing process for color registering, so that the color registering accuracy is kept.
In a further embodiment
As shown in fig. 7, the first tension isolating member G in the second chromatography unit2When the conveying speed of the printing material is adjusted, the printing material in the first chromatography unit is interfered, further, as shown in fig. 8, a tension isolation section is formed between every two first tension isolation components 6, a second tension isolation component 8 is arranged in each tension isolation section, the second tension isolation component 8 is positioned on the output side of a tension detection component 9, the second tension isolation component 8 divides the tension isolation section into a printing section 3a and a non-printing section 3b, and the tension detection component 9 is positioned in the printing section 3 a.
Thus, by further separating the color register unit, the active speed regulating unit (the first tension isolating part 6) can not influence the conveying speed of the film in the color register unit (because the second tension isolating part 8 isolates the printing section 3a from the non-printing section 3b, the tension isolating part can only change the film tension of the printing section 3 a), thereby further improving the controllability of the rotating speed of the film in the printing section 3a and improving the color register precision.
Wherein, the tension detecting component 9 at the output side of each transfer mechanism 3 is correspondingly arranged with the first tension isolating component 6 at the input side of the transfer mechanism 3, and the second tension isolating component 8 keeps the original transmission speed, so as to avoid the interference of the tension of the film in the printing section 3a in the next set of color unit when the second tension isolating component 8 carries out active speed regulation.
Specifically, the first tensile separating member G1And a second tension-isolating member G "1With V1A first tension-isolating member G for separating the printing material2And a second tension-isolating member G "2With V1The first tension-isolating memberG3And a second tension-isolating member G "3With V1The transport speed of (1) transporting the printing material; when the tension of the film in the second color registration unit becomes large, the tension detecting member J2The controller 10 controls the first tension-isolating member G in the second cells by detecting the increase of the tension2Reducing the speed of transport, and a second tension-isolating member G "2Without changing the original transmission speed, still at V1The transport speed of (a) transports the printing material. Up to the tension detecting part J2Is returned to the predetermined value.
In an alternative embodiment, the structure of the second tension isolation member 8 is the same as the structure of the first tension isolation member 6.
Further, as shown in fig. 8, the drying unit 7 is located in the non-printing section 3 b. The tension transmission of the drying unit 7 to the printing section 3a due to the tension change of the film caused by heat drying can be avoided, and the color register accuracy is further improved.
Method for controlling flexographic printing press with accurate color register
The invention also provides a technical scheme, and the method for controlling the flexographic printing machine with accurate color register comprises the following steps:
step 1, respectively arranging a first tension isolating component and a second tension isolating component at the input side and the output side of each transfer mechanism 3, wherein the tension isolating components (namely the first tension isolating component and the second tension isolating component) are arranged to be capable of adjusting the conveying speed of a printing material, and a tension detecting component is arranged between the first tension isolating component and the second tension isolating component;
step 2, connecting each first tension isolation component to an independent servo driving component, connecting each tension detection component in parallel, controlling the tension of each tension detection component to be the same, and setting the corresponding relation between the tension isolation components and the tension detection components belonging to the same printing unit;
and 3, receiving the tension fed back by each tension detection component in the printing process, and controlling each servo driving component corresponding to the changed tension detection component to adjust the conveying speed of the printing material according to the tension fed back by the tension detection component so as to enable the tension of each tension detection component to reach a preset state.
Further, as shown in fig. 8, a tension isolation section is formed between every two first tension isolation members 6, a second tension isolation member 8 is provided in each tension isolation section, the second tension isolation member 8 is located on the output side of the tension detection member 9, the second tension isolation member 8 divides the tension isolation section into a printing section 3a and a non-printing section 3b, and the tension detection member 9 is located in the printing section 3 a.
Thus, by further separating the color register unit, the active speed regulating unit (the first tension isolating part 6) can not influence the conveying speed of the film in the color register unit (because the second tension isolating part 8 isolates the printing section 3a from the non-printing section 3b, the tension isolating part can only change the film tension of the printing section 3 a), thereby further improving the controllability of the rotating speed of the film in the printing section 3a and improving the color register precision.
Wherein, the tension detecting component 9 at the output side of each transfer mechanism 3 is arranged corresponding to the first tension isolating component 6 at the input side of the transfer mechanism 3, and the second tension isolating component 8 keeps the original transmission speed, so as to avoid the interference of the tension of the film in the printing section 3a in the next set of color unit when the second tension isolating component 8 carries out active speed regulation.
Specifically, the first tensile separating member G1And a second tension-isolating member G "1With V1A first tension-isolating member G for separating the printing material2And a second tension-isolating member G "2With V1A first tension-isolating member G for separating the printing material3And a second tension-isolating member G "3With V1The transport speed of (1) transporting the printing material; when the tension of the film in the second color registration unit becomes large, the tension detecting member J2The controller 10 controls the first tension-isolating member G in the second cells by detecting the increase of the tension2Reducing the speed of transport, and a second tension-isolating member G "2Without changing the original transmission speed, still at V1Transport speed of transporting a printing materialUp to the tension detecting part J2Is returned to the predetermined value.
With the combination of the above embodiments, the present invention sets the printing units in a distributed manner, limits the variation of the tension of the printing material in each printing unit by setting the tension isolation component, and connects the tension monitoring point at the output end of the printing unit, and adjusts the conveying speed of the tension isolation component to the printing material in real time by the feedback of the tension, so as to control the printing material in each printing unit to be transferred and color-registered with the same tension, therefore, the material is not deformed during color registration, so as to ensure the color registration accuracy of each printing unit.
The invention adopts the design of distributed printing units, the number of the color register can be increased or decreased according to the requirement, the field only has the length requirement, the assembly difficulty is low, and the maintenance cost is low; in addition, the printing unit is arranged on the ground, the operation space is large, the difficulty of the operation processes such as plate changing and the like is low, and when a fault occurs, the fault can be timely found and processed.
According to the invention, the drying unit is arranged behind each printing unit, so that the printing ink on the printing material can be dried in time, pollution is prevented, the drying effect is good, the environment-friendly water-based printing ink with longer drying time can be adopted, the higher printing speed can be kept, the production efficiency is improved, and the energy is saved and the environment is protected.
The drying units and the printing drive servo are designed independently, when the printing machine runs under a non-full load condition, particularly when the printing machine runs in a less-color overprinting mode, only the corresponding number of drying units and the corresponding number of drive servos need to be opened, and the printing machine has the advantages of low energy consumption and low production cost.
Although the present invention has been described with reference to the preferred embodiments, it is not intended to be limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the invention. Therefore, the protection scope of the present invention should be determined by the appended claims.

Claims (14)

1. A flexographic printing machine with accurate register, comprising:
the unreeling part is used for supplying a coiled material to be printed;
a printing unit for printing ink on the printing material supplied from the unwinding unit;
the rolling component is used for rolling the printing component and printing the printing material;
a controller;
wherein the printing unit comprises at least two printing units which are linearly arranged in spatial distribution, each printing unit prints ink of one color on a printing material, and each printing unit comprises:
the printing device comprises a first tension isolation component, a transfer printing mechanism, a tension detection component and a drying mechanism, wherein the first tension isolation component, the transfer printing mechanism, the tension detection component and the drying mechanism are sequentially arranged along the feeding direction of a printing material, the first tension isolation component is arranged to control the conveying speed of the printing material, the transfer printing mechanism is used for transferring printing ink to the printing material, the tension detection component is used for detecting the tension generated when the printing material passes through, and the drying mechanism is used for drying the printing ink printed on the surface of the printing material by the transfer printing mechanism;
the guide rollers are used for defining a transmission route of the printing material so that the printing material sequentially passes through the first tension isolation part, the transfer printing mechanism, the tension detection part and the drying mechanism;
the controller is set to adjust the conveying speed of the first tension isolating component in the printing unit to the printing materials according to the tension of the printing materials detected by the tension detecting components, so that the printing materials can keep consistent tension when the printing units are transferred.
2. The process accurate flexographic printing machine according to claim 1, wherein a plurality of said printing units are arranged linearly on a floor, said transfer mechanism and said drying mechanism are spatially distributed up and down, said drying mechanism is located above said transfer mechanism, and an operation space for a person to pass is formed between each two of said printing units.
3. The process-accurate flexographic printing press according to claim 1, wherein said transfer mechanism comprises a cartridge, a doctor blade for transferring ink from the cartridge to the surface of said anilox roller, an anilox roller for transferring ink to the surface of said plate roller, and a plate roller.
4. The process-accurate flexographic printing machine according to claim 3, wherein said transfer mechanism is movably disposed so as to be able to move closer to or away from the transport path of the printing material, having a printing position in which the ink on said plate roller is transferred to the surface of the printing material and a maintenance position in which said plate roller is away from the printing material and a maintenance space is formed between said plate roller and the printing material.
5. The process precise flexographic printing machine according to claim 1, wherein said tension detecting means comprises a pressure roller elastically mounted on a frame, a linear spring disposed between said pressure roller and said frame for providing an elastic force between said pressure roller and said frame, and a displacement sensor for monitoring the relative displacement between said pressure roller and said frame to reflect the magnitude of the tension of the substrate by the amount of displacement between said pressure roller and said frame.
6. The process accurate flexographic printing press according to claim 1, wherein said first tension isolation member comprises:
-a glue roller arranged on the non-printing side of the printing material;
-a backing roll, arranged on the printing side of the substrate, which can be servo-driven to control the transport of the substrate at a predetermined speed;
the rubber roller and the back roller are attached to limit the printing material to slide relative to the contact part of the rubber roller and the back roller.
7. The process accurate flexographic printing machine according to claim 6, wherein said first tension isolation member further comprises a servo motor, an output of said servo motor being connected to said backing roller, said servo motor being output state controlled by a controller to adjust a rotational speed of said backing roller.
8. The flexographic printing machine with accurate color register and the control method according to claim 6, wherein the rubber roller is configured to be driven to displace to form a press-fit/press-separate state between the rubber roller and the backing roller, wherein the rubber roller and the backing roller are in contact in the press-fit state, and the rubber roller and the backing roller are separated in the press-separate state.
9. A control method of a flexographic printing machine with accurate color register is characterized by comprising the following steps:
step 1, arranging a first tension isolating component at the input side of each transfer mechanism, enabling the first tension isolating component to control the conveying speed of a printing material, and arranging a tension detecting component between every two first tension isolating components;
step 2, connecting each first tension isolating component to an independent servo driving component, connecting each tension detecting component in parallel, and setting corresponding relations between the first tension isolating components and the tension detecting components belonging to the same printing unit;
and 3, receiving the tension fed back by each tension detection component in the printing process, and controlling each servo driving component corresponding to the changed tension detection component to adjust the conveying speed of the printing material according to the tension fed back by the tension detection component so as to enable the tension of each printing material to reach a preset state.
10. The flexographic printing machine with accurate color register according to any of claims 1 to 8, wherein a tension isolation section is formed between every two first tension isolation members, a second tension isolation member is provided in each of the tension isolation sections, the second tension isolation member is located on an output side of the tension detection member, the second tension isolation member divides the tension isolation section into a printing section and a non-printing section, and the tension detection member is located in the printing section.
11. The process accurate flexographic printing press according to claim 10, wherein said second tension isolation member and said first tension isolation member are identical in construction.
12. A control method of a flexographic printing machine with accurate color register is characterized by comprising the following steps:
step 1, respectively arranging a first tension isolation component and a second tension isolation component on the input side and the output side of each transfer printing mechanism, wherein the tension isolation components are arranged to be capable of adjusting the conveying speed of a printing material, and a tension detection component is arranged between the first tension isolation component and the second tension isolation component;
step 2, connecting each first tension isolation component to an independent servo driving component, connecting each tension detection component in parallel, and setting corresponding relations between the tension isolation components and the tension detection components belonging to the same printing unit;
and 3, receiving the tension fed back by each tension detection component in the printing process, and controlling each servo driving component corresponding to the changed tension detection component to adjust the conveying speed of the printing material according to the tension fed back by the tension detection component so as to enable the tension of the printing material to reach a preset state.
13. The process of controlling a flexographic printing machine with accurate color register according to claim 12, wherein in step 2, the first tension isolating member and the tension detecting member at the input side of each printing mechanism are placed in correspondence.
14. The process of claim 12 or 13, wherein in step 3, the tension detected by each tension detecting member is maintained the same, so that the printing material is fed into the printing unit with a uniform tension.
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