JP5736801B2 - Supply air fan speed control system, supply air fan speed control method, gravure printing machine - Google Patents

Description

  The present invention relates to an air supply fan rotation speed control system, an air supply fan rotation speed control method, and a gravure printing machine in a gravure printing machine drying apparatus.

  Conventionally, gravure printing using a gravure printing machine is known as one of printing methods. FIG. 4 is a diagram showing a schematic configuration of a gravure printing machine, and FIG. 5 is a diagram showing a process of gravure printing.

  As shown in FIG. 4, the gravure printing machine 10 includes a paper feed unit (not shown), a paper discharge unit (not shown), and a plurality of printing units 3 (3a, 3b, 3c). Each printing unit 3 performs printing for each color (for example, cyan, magenta, yellow, sumi, special color, etc.). The printing material 13 fed from the paper feeding unit is conveyed by a plurality of conveying rollers 15 in the order of the printing unit 3a, the printing unit 3b, and the printing unit 3c, and each color is printed and discharged to the paper discharge unit. .

  Each printing unit 3 includes an impression cylinder 5, a plate cylinder 7, an ink pan 9, a finisher roll 72, a doctor blade 73, an air cylinder 75, a drying device 81, and the like. The ink pan 9 contains the ink 11 of the color of each printing unit 3. The air cylinder 75 adjusts the pressure applied to the impression cylinder 5 so that a uniform pressure is applied to the conveyed printing material 13.

  As shown in FIG. 5 (a), in gravure printing, generally, a plate cylinder 7 is provided on an ink pan 9, and the plate cylinder 7 rotates (direction A in the figure) so that the surface of the plate cylinder 7 is formed. Ink 11 adheres. As shown in FIG. 5B, the excess ink 11 is scraped off by the doctor blade 73, and the ink 11 is filled only in the cells 71 that are the concave portions of the plate cylinder 7.

  Next, as shown in FIG. 5 (c), between the plate cylinder 7 and the impression cylinder 5 provided so as to be close to the plate cylinder 7 and rotating in the opposite direction (B direction in the figure). The ink 11 in the cell 71 is applied to the printing material 13 such as paper, cellophane, OPP (orientated polypropylene), PET (polyethylene terephthalate), nylon, or the like that passes in the transport direction (direction C in the figure). Be transferred. About the printing material 13, the ink 11 on the printing material 13 is dried with the hot air 35 of the drying apparatus 81 provided in the position further advanced in the conveyance direction, and the printing process of 1 color is complete | finished.

  The gravure printing machine 10 requires electric power, steam, compressed air, cooling water, etc. as energy. In particular, in the drying device 81 that dries the ink 11 attached to the printing material 13, hot air 35 is applied to the printing material 13. In order to blow and dry, a large amount of electric power is consumed for generating steam for heating the outside air and operating an air supply fan provided for blowing hot air 35. It is important from the viewpoint of energy saving to reduce the consumption of steam and electric power.

  Conventionally, for this purpose, when the printing is not performed for a long time, the method of stopping the operation of the air supply fan has been adopted, or when the gravure printing machine is in operation, the air volume is adjusted according to the state in the drying device. A method of reducing energy during operation has also been proposed (Patent Document 1).

  In the method of Patent Document 1, a temperature controller and a pressure controller are provided at the dryer inlet, the rotation of the modular roll motor is controlled according to the temperature measured by the temperature controller, and the opening and closing control of the mixing damper that changes the ratio of hot air and cold air is performed. The inverter is controlled according to the pressure measured by the pressure controller to control the rotation speed of the air supply fan, and the process conditions for drying during the operation of the gravure printing machine are checked to reduce energy.

JP-A-6-344536

  By the way, as a preparatory work for entering the actual printing (printing of the normal paper as a product), it is necessary to perform rough adjustment work of plate positioning and perform plate positioning among a plurality of printing units. There is a mark for alignment at the end of the plate, and the printing position on the paper is adjusted to a certain positional relationship. The printing speed at this time is lower than that at the time of actual printing (10 to 20% at the time of actual printing). Conventionally, even during printing at such a low speed, the air supply fan performs drying at the same rotation speed of the air supply fan as during main printing, and energy consumption at this time cannot be reduced.

  On the other hand, the method of Patent Document 1 is an effective technique during operation of a gravure printing machine, but does not reduce energy that is wasted during low-speed printing as described above.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide an air supply fan rotation speed control system and the like that reduce energy consumed by a drying device depending on an operating state of a gravure printing machine.

According to a first aspect of the present invention, there is provided an operation state detecting means for detecting whether or not an air supply fan of a drying device of a gravure printer is in a predetermined operation state and a printing speed by the gravure printer. And the operation state detecting means detects the rotation speed of the supply fan when the supply fan is in a predetermined operation state and the printing speed is equal to or lower than a predetermined value. An air supply fan rotation speed control means that sets a value lower than a value when the air supply is greater than a predetermined value, and the air supply fan rotation speed control means sets the rotation speed of the air supply fan to be greater than a predetermined value. Outside air supplied to the drying device based on temperature information measured by a temperature measuring device provided in a flow path for supplying hot air to the drying device via the air supply fan. The A supply fan revolution speed control system characterized by comprising a steam amount adjusting means for increasing the amount of steam supplied to the heat exchanger for heat, the.

The operating state detection means detects the printing speed of the gravure printing machine, for example, by detecting the amount of rotation of the plate cylinder or impression cylinder of the gravure printing machine .

The second aspect of the invention is an operation state detection step of detecting whether or not an air supply fan of a drying device of a gravure printing machine is in a predetermined operation state and a printing speed by the gravure printing machine by an operation state detection unit, In the operation state detection step, when it is detected that the air supply fan is in a predetermined operation state and the printing speed is equal to or lower than a predetermined value, the air supply fan rotation speed control means rotates the air supply fan. and air supply fan speed control step of the print speed number is a value lower than the value of larger than the predetermined value, the printing speed the rotational speed of the air supply fan in the air supply fan rotation speed control process is given When the value is lower than the value when the value is larger than the value, the drying is performed based on temperature information measured by a temperature measuring device provided in a flow path for supplying hot air to the drying device via the air supply fan. Used for equipment A supply fan speed control method characterized by comprising a steam amount adjusting step the amount of steam supplied to the heat exchanger for heating the outside air is increased by the steam amount adjusting means for the.

In the operation state detection step, for example, the printing speed of the gravure printing machine is detected by detecting the amount of rotation of the plate cylinder or impression cylinder of the gravure printing machine .

  A third invention is a gravure printing machine provided with the supply fan rotation speed control system of the first invention.

According to the present invention, the printing speed is detected from the amount of rotation of the plate cylinder and the like, and together with the detection of the operating state of the air supply fan of the drying device, the air supply fan is in the operating state, but the printing speed is below a predetermined value. In this case, it is possible to reduce the rotation speed of the air supply fan and reduce energy consumption.
At this time, a decrease in the temperature of the air passage due to a reduction in the number of rotations of the air supply fan is detected, and accordingly, the amount of steam for heating the outside air supplied to the drying device is increased, so that the hot air supplied to the drying device is increased. It is possible to prevent a decrease in temperature and to smoothly raise the blowing temperature of the drying device when the gravure printing machine is returned to normal operation.

  From the above, it is possible to provide an air supply fan rotation speed control system or the like that reduces the energy consumed by the drying device depending on the operating state of the gravure printing machine.

1 is a schematic configuration diagram showing a configuration of an air supply fan rotation speed control system 1 according to an embodiment of the present invention. The flowchart which shows the flow of a process of the air supply fan rotation speed control system 1 The schematic block diagram which shows the structure of the air supply fan rotation speed control system 1a which concerns on another Example of this invention. Schematic configuration diagram showing the configuration of the gravure printing machine 10 Diagram showing the outline process of gravure printing

Hereinafter, the present invention will be described in detail with reference to the embodiments shown in the drawings.
FIG. 1 is a schematic configuration diagram showing a configuration of an air supply fan rotation speed control system 1 according to an embodiment of the present invention. An air supply fan rotation speed control system 1 according to the present invention is provided in a gravure printing machine 10 whose examples are shown in FIGS.

  As described with reference to FIGS. 4 and 5, the gravure printing machine 10 includes a plurality of printing units 3 (3 a, 3 b, 3 c,...), And each printing unit 3 includes a drying device 81. . FIG. 1 shows only one of the printing units 3 in the gravure printing machine 10. Further, the printing unit 3 having the same configuration as that described in FIGS. 4 and 5 is denoted by the same reference numeral, and a part of the description is omitted.

  As shown in FIG. 1, the drying device 81 includes a drying hood 27 for blowing hot air 35 onto the printing material 13, and the printing material 13 is conveyed through the drying hood 27 by a plurality of conveying rollers 15. A drying process of the printed ink 11 is performed.

  The drying device 81 is provided with a flow path 22 such as a pipe for taking in and heating the outside air 33 by the air supply fan 21 and supplying the hot air 35 to the drying device 81. A heat exchanger 23, an air supply fan 21, a resistance temperature detector 29, and the like are attached to the flow path 22. Further, the heat exchanger 23 is provided with a flow path 26 for supplying the steam 31 to the heat exchanger 23, and the steam 31 supplied via the flow path 26 causes the outside air 33 in the heat exchanger 23. Is heated. A steam amount adjusting valve 25 is provided in the flow path 26, and the amount of steam supplied can be controlled by adjusting the opening degree.

The steam 31 travels in the direction toward the heat exchanger 23 (direction a in the figure) through the flow path 26 by the air supply fan 21, and the steam inflow amount to the heat exchanger 23 is adjusted by the steam amount adjusting valve 25. The steam 31 whose flow rate has been adjusted enters the heat exchanger 23.
On the other hand, the outside air 33 proceeds in the direction toward the heat exchanger 23 (direction b in the figure) through the flow path 22 and enters the heat exchanger 23, and is heated by the steam 31. The heated air (hot air 35) travels through the flow path 22 from the heat exchanger 23 to the air supply fan 21, and the amount of hot air 35 according to the rotational speed of the air supply fan 21 is sent to the drying hood 27 (direction c in the figure). ) And is supplied to the drying device 81 and sprayed onto the printing material 13. The hot air 35 blown onto the printing material 13 travels in the direction toward the outside (direction d in the figure) through the flow path 36 provided in the drying hood 27 and is discharged as exhaust 37.

  The air supply fan rotation speed control system 1 of the present embodiment provided in the above-described gravure printing machine 10 controls the rotation speed of the air supply fan 21, and the air supply fan rotation speed control device 2, The plate cylinder 7 includes an encoder 7a, a resistance temperature detector 29, a steam amount adjusting valve 25, and the like.

  The supply fan rotation speed control device 2 is composed of, for example, a sequencer and the like, has a calculation unit, a memory, an input / output interface, and the like, and performs control under predetermined conditions according to a flowchart described later. The memory stores a program for performing sequencer processing and data used for the processing. The supply fan rotation speed control device 2 may also serve as the control device for the gravure printing machine 10 or may be provided separately from the control device for the gravure printing machine 10.

The encoder 7 a is provided in the plate cylinder 7 and inputs the rotation amount of the plate cylinder 7 to the supply fan rotation speed control device 2 as printing speed information 41 indicating the printing speed by the gravure printing machine 10. The encoder 7 a may be provided in the impression cylinder 5, and the rotation amount of the impression cylinder 5 may be used as the printing speed information 41.
For example, when the air supply fan rotation speed control device 2 also serves as the control device of the gravure printing machine 10 and sends a signal indicating the rotation amount of the plate cylinder 7 or the impression cylinder 5, it is transmitted as the printing speed information 41. This signal information (printing speed command 42) may be used as it is.

  The resistance temperature detector 29 is a temperature measuring device that is provided between the heat exchanger 23 and the drying hood 27 in the flow path 22 and measures the temperature of the hot air 35 supplied to the drying hood 27. The temperature measurement value by the resistance temperature detector 29 is input to the supply fan rotation speed control device 2 as temperature information 47.

  Further, for the supply fan rotation speed control in the supply fan rotation speed control device 2, supply fan operation information (not shown) indicating the operation / stop state of the supply fan 21 is used. For this, the information of the rotation speed command 43 instructing the rotation, the rotation speed, and the like transmitted from the supply fan rotation speed control device 2 to the supply air fan 21 can be used. Alternatively, a sensor (such as an air volume sensor) for detecting the operation / stop state is provided in the supply fan 21 and information from the sensor is input to the supply fan rotation speed control device 2 as supply fan operation information. Good.

  The air supply fan rotation speed control device 2 supplies a rotation speed command 43 for controlling the rotation speed of the air supply fan 21 by sequence control based on the printing speed information 41, temperature information 47, air supply fan operation information, and the like. A steam amount command 49 for controlling the amount of steam flowing into the heat exchanger 23 according to the opening degree of the steam amount adjusting valve 25 is output to the fan 21 to the steam amount adjusting valve 25.

In order to rotationally drive the air supply fan 21, for example, an induction motor which is a kind of AC motor is used. The case where the induction motor to be used has four poles will be described. The frequency f (Hz) of the alternating current flowing through the induction motor, the number P of the induction motor, and the rotation speed N (rpm) of the induction motor (the rotation speed of the air supply fan). Is N = 120 × f / P.
For example, when the gravure printing machine 10 is operated, in order to control the air supply fan 21 at a normal rotation speed, for example, a rotation speed command 43 with the frequency f set to 50 Hz is output, and the motor is controlled via an inverter. Then, the rotation of the air supply fan 21 is controlled to a normal rotation speed. Further, a steam amount command 49 is output to the steam amount adjusting valve 25, and the opening degree of the steam amount adjusting valve 25 is controlled to the normal state.

  Next, the flow of the supply fan rotation speed control by the supply fan rotation speed control system 1 will be described with reference to FIG. FIG. 2 is a flowchart showing a process flow of the supply fan rotation speed control system 1.

  In the air supply fan speed control by the air supply fan speed control system 1, first, the air supply fan speed control device 2 determines the operating state of the air supply fan 21 (step S101). As described above, the operating state of the air supply fan 21 can be determined, for example, based on the value of the rotational speed command 43 to the air supply fan 21 transmitted from the air supply fan rotational speed control device 2. If the air supply fan 21 is “0”, it can be detected that the air supply fan 21 is stopped, and if it is a predetermined value other than that (for example, 50 Hz), the air supply fan 21 is not stopped but is in a predetermined operation state.

  When the air supply fan 21 is stopped in step S101, the gravure printing machine 10 is not operating and is in a stopped state for a long period of time, and the air supply fan rotation speed control device 2 performs the rotation speed without performing any particular control. The state of 0 rpm (air supply fan 21 is stopped) is maintained (step S102).

  On the other hand, if the air supply fan 21 is in operation in step S101, next, the printing speed is determined based on the printing speed information 41 (step S103).

  When the printing speed information 41 indicates that the printing speed is higher than a predetermined value (30 m / min in the present embodiment), it is determined that the normal printing is being performed, and the air supply fan rotation speed control device 2 rotates. In accordance with the number command 43, the control for setting the normal supply fan rotation speed during operation of the gravure printing machine 10 is continued. For example, the rotational speed is controlled by setting the frequency f to 50 Hz. When the frequency f of the alternating current flowing through the induction motor is 50 Hz, the rotation speed N of the induction motor is 120 × 50/4 = 1500 rpm from the above relational expression (step S105).

  When the printing speed information 41 indicates that the printing speed is equal to or lower than the predetermined value, it is determined that the gravure printing machine 10 is operating at a low speed for rough adjustment work of plate position alignment or the like. In this case, the air supply fan rotation speed control device 2 sets the rotation speed command 43 sent to the air supply fan 21 to, for example, 25 Hz, which is half of the normal speed, and sets the rotation speed of the air supply fan 21 to be higher than the normal operation state. Reduce. When the frequency f is 25 Hz, the rotational speed N of the induction motor is 750 rpm, and the rotational speed of the air supply fan 21 is reduced to ½ of the normal time (step S104).

  In step S <b> 104, temperature information 47 measured by the resistance temperature detector 29 is input to the supply fan rotation speed control device 2. When the temperature of the temperature information 47 measured by the resistance temperature detector 29 decreases, the supply fan rotation speed control device 2 controls the opening of the steam amount adjustment valve 25 according to the temperature information 47 and performs heat exchange. The steam amount command 49 is output so as to increase the amount of the steam 31 flowing into the oven 23, and the heating temperature of the outside air 33 in the heat exchanger 23 is increased by the increase in the amount of steam, so that the hot air used in the drying device 81 is increased. The temperature drop of 35 is suppressed.

This is because if the rotational speed of the air supply fan 21 is reduced in step S104, the supply amount of the steam 31 is also reduced, whereby the temperature of the hot air 35 is lowered, and if the gravure printing machine 10 is operated at a normal speed as it is, the hot air 35 This is because it takes time to raise the temperature to a predetermined temperature again to achieve a stable state, thereby reducing the operation efficiency of the gravure printing machine 10. The supply air fan rotation speed control device 2 suppresses the decrease in the temperature of the hot air 35 by the above processing, thereby increasing the time until the hot air 35 is raised to a predetermined temperature and stabilized after returning from the low speed operation state. The operation in the normal state can be resumed without shortening and reducing the operation efficiency of the gravure printing machine 10.
In addition, since the rotation speed of the air supply fan 21 is lower than normal, even when the above processing is performed, the amount of supplied steam is reduced from the normal time.

  After the processes of step S102, step S104, and step S105 described above, the process returns to step S101, and the processes of step S101 to step S105 are repeated. In the present embodiment, the rotation speed of the air supply fan 21 during normal operation is set to 1500 rpm, and the rotation speed during low-speed printing is reduced to 750 rpm. However, the present invention is not limited to this. However, there is a proportional relationship between approximately the third power of the rotational speed of the air supply fan 21 and the consumed energy, and if the rotational speed is lowered to a certain extent, the energy saving effect is small even if the rotational speed is lowered further, and printing is resumed. Considering shortening the rise time when the rotation speed of the air supply fan 21 is sometimes increased, it is preferable to reduce it to about ½ as described above.

  With the above processing, when the gravure printing machine 10 is operating at a low speed for rough adjustment work of plate position alignment, energy saving is realized by automatically reducing the rotation speed of the air supply fan 21.

  That is, the air supply fan rotation speed control system 1 determines whether or not the air supply fan 21 that supplies hot air to the drying device 81 is in a predetermined operation state, and the gravure printer 10 performs printing at a predetermined speed. As an operation state detection means for detecting whether or not there is an encoder 7a, an air supply fan rotation speed control device 2, etc., the air supply fan 21 is in a predetermined operation state while printing at a low speed is performed. Is detected, the air supply fan speed control device 2 or the like is provided as an air supply fan speed control means for setting the speed of the air supply fan 21 to a value lower than that during normal operation. When the number of revolutions is set to a low value, the supply fan revolution number control is performed as a steam amount adjusting means for adjusting the amount of steam supplied to the heat exchanger 23 based on the temperature information 47 measured by the resistance temperature detector 29. Device 2 and steam control valve It has 5 or the like, thereby enabling the processing by the air supply fan revolution speed control system 1 by such a configuration.

  In the above description, the rotation amount of the plate cylinder 7 acquired by the encoder 7a is used as the printing speed information of the gravure printing machine 10, but the printing speed may be determined by other methods.

  An example thereof is an air supply fan rotation speed control system 1a shown in FIG. 3, and a sensor 28 such as a liquid amount sensor for acquiring the amount of ink 11 is provided in the ink pan 9 instead of the encoder 7a. Other configurations are the same as those of the supply fan rotation speed control system 1 shown in FIG. 1, and therefore, the same numbers are given to the drawings and the description thereof is omitted.

  The consumption rate of the ink 11 can be measured by the liquid amount sensor 28, and this can be used as the printing speed information. In step S <b> 103 of FIG. 2, the supply fan rotation speed control device 2 detects the printing speed by determining the printing speed based on the consumption speed of the ink 11. As a result, it is possible to proceed with the subsequent processing in the same manner as in FIG. 2 and reduce the number of rotations of the paper feed fan 21, thereby realizing energy saving.

With the above air supply fan rotation speed control system, it is possible to automatically reduce the rotation speed of the air supply fan 21 without increasing the work burden on the operator and without increasing the cost. It is possible to reduce energy consumption by reducing the amount of electric power for rotating 21 and the consumption of steam 31 that creates hot air 35.
For example, in a general gravure printing machine, the case where the supply fan rotation speed control system of the present invention is applied was examined. As a result, the electric energy was reduced to about 1/8 without reducing the printing operation efficiency. The knowledge that can be reduced to about 2/3 was obtained.

  The preferred embodiments of the air supply fan speed control system and the like according to the present invention have been described above with reference to the accompanying drawings, but the present invention is not limited to such examples. It will be apparent to those skilled in the art that various changes or modifications can be conceived within the scope of the technical idea disclosed in the present application, and these naturally belong to the technical scope of the present invention. Understood.

DESCRIPTION OF SYMBOLS 1, 1a ... Supply air fan speed control system 2 ... Supply air fan speed control device 5 ... Pressure cylinder 7 ... Plate cylinder 7a ... Encoder 10 ... Gravure printing machine 11 ... …… Ink 21 ………… Air supply fan 23 ………… Heat exchanger 25 ………… Steam amount adjusting valve 27 ………… Dry hood 28 ………… Sensor 29 ………… Temperature measuring resistor 31 ………… Steam 33 ……… Outside air 35 ……… Hot air 37 ……… Exhaust 41 ……… Print speed information 43 ……… Rotational speed command 47 ……… Temperature information 81 ……… Drying device

Claims (5)

Whether or not the air supply fan of the drying device of the gravure printing machine is in a predetermined operation state, and an operation state detection means for detecting a printing speed by the gravure printing machine,
When the operating state detecting means detects that the air supply fan is in a predetermined operating state and the printing speed is equal to or lower than a predetermined value, the rotation speed of the air supply fan is set to the predetermined printing speed. An air supply fan speed control means for making the value lower than the value when larger than
When the rotation speed of the supply fan is set to a value lower than the value when the printing speed is higher than a predetermined value by the supply fan rotation speed control means, hot air is supplied to the drying device via the supply fan. A steam amount adjusting means for increasing the amount of steam supplied to a heat exchanger for heating the outside air supplied to the drying device based on temperature information measured by a temperature measuring device provided in the supply flow path;
An air supply fan rotation speed control system comprising:   2. The air supply fan rotation according to claim 1, wherein the operation state detection unit detects a printing speed of the gravure printing machine by detecting a rotation amount of a plate cylinder or an impression cylinder of the gravure printing machine. Number control system. An operation state detection step of detecting whether or not the air supply fan of the drying device of the gravure printing machine is in a predetermined operation state and the printing speed by the gravure printing machine by the operation state detection means,
In the operation state detection step, when it is detected that the air supply fan is in a predetermined operation state and the printing speed is equal to or lower than a predetermined value, the air supply fan rotational speed control means detects the air supply fan. An air supply fan rotation speed control step for setting the rotation speed to a value lower than the value when the printing speed is greater than a predetermined value;
When the rotation speed of the supply fan is set to a value lower than the value when the printing speed is higher than a predetermined value in the supply fan rotation speed control step, hot air is supplied to the drying device via the supply fan. Steam that increases the amount of steam supplied to the heat exchanger for heating the outside air supplied to the drying device based on temperature information measured by the temperature measuring device provided in the supply channel by the steam amount adjusting means A quantity adjustment process;
An air supply fan rotation speed control method comprising: The air supply fan rotation according to claim 3, wherein in the operation state detection step, a printing speed of the gravure printing machine is detected by detecting a rotation amount of a plate cylinder or an impression cylinder of the gravure printing machine. Number control method. Gravure printing machine air supply fan revolution speed control system is provided according to claim 1 or claim 2.

Images