JP2004160785A - Structure for keeping temperature of ink constant - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To stably keep printing quality by efficiently keeping the temperature of ink in an ink pan constant so as to suppress change of ink viscosity with time. <P>SOLUTION: The ink pan 11 capable of housing the ink I is provided between a pair of frames F in a printing press 10. A silicone rubber heater 26 is provided at a position along a bottom surface 20 of the ink pan 11, and the silicone rubber heater 26 is stuck to the bottom surface 20 and inclined side faces 21, 21 of the ink pan 11 via a double-coated pressure-sensitive adhesive sheet 27 so as to follow them. The temperature of the ink 1 in the ink pan is kept constant by the silicone rubber heater 26 to prevent variation of the ink viscosity. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an ink heat retaining structure, and more particularly, to an ink heat retaining structure capable of maintaining a constant temperature of ink contained in an ink pan.
[0002]
[Prior art]
Each printing unit such as a well-known flexographic printing machine is provided with an open-top type ink pan capable of storing ink, and printing is performed by transferring the image to printing paper via a plurality of rolls such as a fountain roll facing the ink pan. Is performed. In such a printing unit, there is a disadvantage that the ink viscosity of the ink changes over time as the time elapses from the start of printing, and the printing quality tends to be unstable. In addition, when a high-viscosity ink having an ink viscosity of 3,000 cps or more is used, or when the ink becomes high in viscosity due to a decrease in temperature in winter or the like, the ink attached to the roll becomes uneven, and the ink becomes outside the ink pan. And there is also a problem that a great deal of labor is required for maintenance.
[0003]
Therefore, for example, Patent Literature 1 discloses an ink heat retaining device for keeping the temperature of ink in an ink pan constant. The heat retention device is configured to include a cover disposed above the ink pan and a heater provided in the cover, and the temperature of the ink and the ink viscosity are maintained by maintaining the temperature in the cover constant by the heater. It is designed to prevent changes.
[0004]
[Patent Document 1]
JP-A-56-150553
[Problems to be solved by the invention]
However, in the heat retention device, when the heater is heated to raise the temperature of the ink, heat tends to escape to the outside of the cover, and power consumption tends to increase. In addition, since the temperature of the ink is indirectly warmed by increasing the temperature inside the cover, the time required to set the ink at a desired temperature is enormous, which not only wastes power consumption but also increases the printing time. As a result, there is a disadvantage that the printing cost is increased. In addition, since the heat retaining device is a dedicated device that can be attached only to a specific ink pan, there is a disadvantage that it cannot be attached to various ink pans.
[0006]
[Object of the invention]
The present invention has been devised in view of such inconvenience, and an object of the present invention is to make it possible to efficiently maintain the temperature of the ink in the ink pan and to suppress the ink viscosity over time to perform printing. An object of the present invention is to provide an ink heat retaining structure capable of stably maintaining quality.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, the present invention is a heat retaining structure for ink contained in an ink pan provided in a predetermined printing device,
A heater is provided at a position along the bottom surface of the ink pan. According to such a configuration, since the ink pan is directly heated, the ink can be efficiently heated with low power consumption. This allows the ink to reach the desired temperature in a short time, not only to shorten the printing operation time, but also to stabilize the printing quality by preventing the fluctuation of the ink viscosity. Become.
[0008]
In the present invention, it is preferable to adopt a configuration in which the heater is constituted by a silicone rubber heater attached to the bottom surface via a double-sided adhesive sheet. According to such a configuration, the ink can be kept warm with a simple structure, and the size of the entire apparatus can be reduced. In addition, it is possible to impart shape followability to the heater, and even if the bottom surface of the ink pan is curved or bent, the heater can be stuck along the surface shape of the bottom surface without difficulty.
[0009]
Further, a configuration may be adopted in which the heater has a size that reaches the side surface portion of the ink pan. With such a configuration, the ink pan can be warmed in a wide area, and the efficiency of keeping the ink warm can be further improved.
[0010]
Further, the heater includes a temperature controller of the heater, and the temperature controller automatically turns on and off the heater when detecting a preset lower and upper limit temperature. be able to. In such a configuration, the temperature of the ink can always be maintained in a certain range. In addition, by using the timer together, the power of the heater is automatically turned on before the operation time, so that the temperature of the ink can be kept at a specific temperature irrespective of the temperature drop at night. Since the ink having the viscosity can be used, the operation can be performed without loss of time.
[0011]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0012]
FIG. 1 is a schematic side view of one printing unit in a flexographic printing press to which the present invention is applied. In this figure, a printing unit 10 includes an ink pan 11 disposed between a pair of frames F (one of which is not shown) positioned substantially parallel to each other, and an ink pan facing the inside of the ink pan 11 and housed in the ink pan 11. A fan-ten roll 13 arranged so that its outer peripheral surface is in contact with I, an anilox roll 15 arranged so as to be in contact with the outer-peripheral surface of the fan-ten roll 13, and a plate on which the ink I transferred to the anilox roll 15 is transferred. The printing apparatus includes a cylinder 16 and an impression cylinder 17 that faces the plate cylinder 16 and sandwiches the printing paper P so that the printing paper P can be sent out.
[0013]
As shown in FIG. 2, the ink pan 11 has a bottomed container shape whose upper part is open. Specifically, the ink pan 11 has a bottom surface 20 having a substantially rectangular shape in a plan view, and a pair of the bottom surfaces 20 connected to both sides in the short width direction of the bottom surface 20 and directed in a direction away from each other as going upward. The inclined side surfaces 21, 21, a pair of upright side surfaces 22, 22 erecting from the upper ends of the inclined side surfaces 21, 21, the bottom surface 20, the inclined side surface 21, and the upright side surface 22 are continuously provided on both sides in the longitudinal direction. Notched concave portions 24A, 24A for receiving the support shaft 13A of the roll 13 are provided with a pair of side surfaces 24, 24 with concave portions formed in the upper central portion. Here, a silicone rubber heater 26 is provided at a position along the outer peripheral surface of the bottom surface 20 and the inclined side surfaces 21 and 21.
[0014]
The silicone rubber heater 26 is formed using a glass fiber reinforced heat-resistant silicone rubber sheet whose operating temperature range is −70 ° C. to 260 ° C., and the bottom surface 20 and the lower surface of each inclined side surface 21, 21 via a double-sided adhesive sheet 27. Affixed so as to follow the shape. Here, the heat generated by the silicone rubber heater 26 is controlled via a temperature adjusting means 28.
[0015]
As shown in FIG. 3, the temperature adjusting means 28 is provided at the center of the lower surface of the silicone rubber heater 26 to detect the temperature of the silicone rubber heater 26, and a lead wire 31 is connected to the temperature sensor 30. And a power supply lead wire 33 that connects the temperature controller 32 and the silicone rubber heater 26 to the right end in FIG. 3. I have. The temperature controller 32 is provided so as to be able to automatically control ON / OFF of the power supply to the silicone rubber heater 26 in accordance with the temperature detected by the temperature sensor 30, and has a lower limit temperature for turning on the silicone rubber heater 26 and The upper limit temperature to be turned off is set in advance.
[0016]
In the above configuration, when the temperature of the ink I in the ink pan 11 drops below a preset lower limit temperature, the temperature sensor 30 detects this and the temperature controller 32 turns on the power supply of the heater 26, that is, Electric power is supplied from the controller 32 to the silicone rubber heater 26 through the lead wire 33 to warm the ink I in the ink pan 11 and to a temperature that maintains the viscosity of the ink I. On the other hand, when the ink I reaches the upper limit temperature, the temperature sensor 30 and the temperature controller 32 operate to stop the power supply to the silicone rubber heater 26. Therefore, the temperature of the ink I in the ink pan 11 is always kept in a certain range. The upper limit temperature is set at a temperature at which the ink I in the ink pan 11 does not gel.
[0017]
Therefore, according to such an embodiment, since the silicone rubber heater 26 is attached to the bottom surface 20 and the inclined side surface 21 of the ink pan 11, it is possible to quickly warm the ink I and suppress the fluctuation of the ink viscosity. It is possible to stabilize print quality by making the ink I adhering to the print 13 uniform. In addition, since the upper and lower limits of the temperature of the ink I can be set in advance by the temperature controller 32, the ink viscosity can be smoothly stabilized according to the temperature, the type and the viscosity of the ink I.
[0018]
The best configuration and method for carrying out the present invention have been disclosed in the above description, but the present invention is not limited to this.
That is, although the present invention has been particularly shown and described with particular reference to particular embodiments, it should be understood that the invention may be practiced without departing from the spirit and scope of the invention. On the other hand, those skilled in the art can make various modifications in shape, quantity, position or direction, and other detailed configurations.
Therefore, the description of limiting the shapes and the like disclosed above is illustratively described to facilitate understanding of the present invention, and does not limit the present invention. The description of the names of members excluding some or all of the limitations is included in the present invention.
For example, in the above embodiment, the temperature of the ink I is controlled by setting the upper and lower temperatures of the ink I in advance, but the temperature of the ink I can be maintained, for example, only the upper temperature of the ink I can be set. As far as possible, the configuration of the temperature adjusting means 28 may be simplified. However, if the upper and lower temperatures can be set in advance as in the above embodiment, it is advantageous in that the temperature and viscosity of the ink I can be controlled with high accuracy.
The ink pan 11 can be variously changed in design. For example, a bottom surface extending obliquely upward from the lower end side of the fountain roll 13 and ink I located on the left and right sides of the bottom surface can be accommodated. It may be constituted by a pair of side surfaces forming a space.
Further, the silicone rubber heater 26 may have a size reaching the upright side surface 22 and the concave side surface 24.
[0019]
【The invention's effect】
As described above, in the present invention, since the heater is provided at a position along the bottom surface of the ink pan, the ink pan containing the ink is directly heated, so that the ink viscosity can be kept constant and the print quality can be stabilized, and The heat of the heater can be efficiently conducted to the ink. As a result, not only the power consumption of the heater can be saved, but also the operation rate of the printing operation can be improved by warming the ink in a short time.
[0020]
Further, since the heater is constituted by a silicone rubber heater attached to the bottom surface of the ink pan via a double-sided adhesive sheet, the structure of the heater can be simplified and the bottom surface has a curved or bent shape. However, it is possible to easily adhere the heater following this.
[0021]
Further, when the size of the heater reaches the side portion of the ink pan, the ink pan can be warmed in a wide area to improve the heat retaining efficiency of the ink.
[0022]
In addition, the heater includes a temperature controller that automatically turns the heater on and off when a preset lower and upper limit temperature is detected. Changes in temperature and viscosity can be prevented, and start-up at the start of printing operation can be performed easily and quickly.
[Brief description of the drawings]
FIG. 1 is a schematic side view showing an embodiment of an ink heat retaining structure according to the present invention.
FIG. 2 is a schematic perspective view of an ink pan.
FIG. 3 is a schematic perspective view of the ink pan viewed from a bottom side.
[Explanation of symbols]
Reference Signs List 10 printing unit 11 ink pan 20 bottom surface 21 inclined side surface 26 silicone rubber heater 27 double-sided adhesive sheet 32 temperature controller I ink

Claims (4)

A heat retaining structure for the ink contained in an ink pan provided in a predetermined printing device,
A heat retaining structure for ink, wherein a heater is provided at a position along a bottom surface of the ink pan. The ink heat retaining structure according to claim 1, wherein the heater is configured by a silicone rubber heater attached to the bottom surface via a double-sided adhesive sheet. 3. The ink heat retaining structure according to claim 1, wherein the heater has a size that reaches a side portion of the ink pan. 3. The heater according to claim 1, wherein the heater includes a temperature controller for the heater, and the temperature controller automatically turns on and off the heater when detecting a preset lower and upper limit temperature. Or a heat retaining structure of the ink according to 3.

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