JPH0584855A - Printing ink drying device of carton making machine - Google Patents

Abstract

PURPOSE:To prevent the contamination of the feed roll of a next process with undried ink by providing a printing ink drying unit in a printing unit device. CONSTITUTION:A printing ink drying unit 15 is arranged immediately after a printing part 4'' and has an infrared heater 17 and a room temp. air supply device 18. Undried ink is heated by the infrared heater 17 and the moisture of the ink is evaporated to be swept off by the air supply device to effectively dry the printing ink and the contamination of the feed rolls in a next process is prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a printing ink drying system capable of effectively drying printing ink printed on a sheet in a printing section of a box making machine.

[0002]

2. Description of the Related Art An outline of a conventional box making machine is shown in FIGS.
Will be explained. First, in FIG. 3, the corrugated cardboard sheet 2 supplied from the paper feeding unit 1 is sent to the printing unit 3 by a conveyor. The normal printing section has several units of the printing device 4 for each color (the example of FIG. 3 is an example having two units), and the predetermined printing is performed on the corrugated board sheet for each color in series. The printed corrugated cardboard sheet is dried with printing ink in the printing section, punched into a predetermined die in the die cutting section 5, and then conveyed while being sandwiched between the vibration sandwich conveyors 6 and passed through the stacking conveyor 7 Stacked on the stacker 8. 4 is an example of another box making machine, which is different from that of FIG. 3 in that the connecting conveyor section 13 is arranged between the printing apparatus 4'and the die cutting section 5 '. The conveyor unit 13 is provided for the time period necessary for the printing ink on the cardboard sheet to dry. Further, 14 is a suction device for sucking and holding a corrugated board sheet conveyed by a conveyor via a belt set on the conveyor. This suction is a perforated belt (not shown) set on the conveyor.
Through the holes in to hold the cardboard sheet resting on the belt.

[0003]

By the way, in the case of the apparatus shown in FIG. 3, the corrugated cardboard sheet printed by the printing rolls 9 and 10 in the printing unit 3 is transferred to the transport rolls 11 and 1.
Since the printing ink is not dried when passing through the roll 2, there is a problem that the rolls 11 and 12 are soiled. Further, in the case of the one shown in FIG. 4, a connection conveyor unit 13 is provided between the printing apparatus 4'and the die-cut unit 5'for allowing the printing ink to dry naturally, but in this case as well, the connection conveyor unit 13 is provided. As in the case of the above apparatus, the transport rolls 11 'and 12' are contaminated, and in the case of this apparatus, there is a problem that it is difficult to cope with the speeding up of the machine. Under the above circumstances, it may be possible to dry the printing ink with hot air in order to eliminate the above-mentioned problems, but when hot air is used, the ambient temperature inside the printing unit becomes extremely high. However, another concern arises that the ink may be solidified.

Therefore, in the present invention, an infrared heating device and an air supply device at room temperature are provided side by side in the printing unit device for each color, the infrared heating device heats and evaporates the water in the printing ink, and the evaporated water is supplied to the air. It is an object of the present invention to provide a printing ink drying system for a box-making machine, which can eliminate the above-mentioned conventional problems by removing the ink by a device.

[0005]

SUMMARY OF THE INVENTION Therefore, according to the present invention, in a box making machine for printing a corrugated cardboard sheet, punching a die, and producing a folded corrugated cardboard, a printing ink heating device is provided at a position immediately after the printing unit finishes printing. A printing ink drying unit including an air supply device and an air supply device is provided, which serves as means for solving the problem.

[0006]

[Function] By arranging a unit having both the infrared heating device and the air supply device at room temperature between the printing units,
The water in the printed ink is well heated and evaporated by this infrared heating. Evaporated water is removed by supplying air at room temperature, the evaporation of water in the printing ink is further promoted, and the printing ink can be dried efficiently.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is an overall view of a box-making machine printing ink drying system. In FIG. 1, the corrugated paperboard sheet fed from the paper feed unit 1 ′ is sent to the printing unit 4 ″ by a conveyor. The sheet exiting the printing unit 4 ″ enters the printing ink drying unit 15. The printing ink drying unit 15 includes a sheet conveying conveyor 16, an infrared heating device 17, and a room temperature air supply device 1.
8, an exhaust blower 19, a duct 20 and the like. The conveyer 16 may be the same as a conventional conveyer, and a suction device for holding a sheet by a suction force of an exhaust blower 19 through a belt having holes formed on the conveyer may be a conventional device.

Next, the infrared heating device 17 will be described. The infrared heater used in this device is not particularly limited in terms of wavelength, and any of the conventional near-infrared to far-infrared wavelengths can be output. Such an infrared heater may be used. Here, as an example, a far infrared heater mainly having a wavelength of 3 μm is arranged. By the way, according to a study by the inventors of the present invention, it was found that flexo ink has a large absorption band in a wavelength range of 3 μm. This is because the ink absorbs infrared rays well when it is irradiated with infrared rays in the 3 μm range,
This means that it can be heated efficiently. 3 μm
The filament temperature of the infrared lamp which mainly irradiates the region is about 700 ° C. In addition, for example, there is an infrared lamp filament having a main wavelength of 1.2 μm band,
In this case, the temperature of the lamp becomes about 2100 ° C., which does not coincide with the ink absorption band. For this reason, infrared rays of this wavelength are relatively inferior in how they are absorbed by the ink, but in terms of radiant energy, infrared rays of this wavelength are on the contrary larger, and the energy density on the heated side becomes large, which is easy. The ink can be heated. For this reason, it is not necessary to limit the wavelength of infrared rays (even infrared rays in the 1.2 μm band can be sufficiently heated).

In this embodiment, when a sheet is heated by the infrared heating device, steam is generated from the heated sheet. However, the water vapor is swept away by the room temperature air blown out from the nozzle of the room temperature air supply device 18 arranged adjacently. After that, the sheet is repeatedly conveyed to the next printing unit 4 ″ and the drying unit 15, and the ink is dried through the same process. It is to be noted that the inventor of the present invention dares to make room temperature the air for sweeping out water vapor. It is concluded that the amount of heat required to evaporate water is sufficiently obtained from infrared rays, but hot air may be used, but in the case of hot air, adverse effects on printing ink, such as heat retention inside the unit Therefore, the room temperature level is preferable, and the air supplied from the air supply device 18 is sucked by the exhaust blower 19 while holding the sheet through the receiver 21 that covers the entire conveyor. For example, as shown by the arrow in the figure, the supply air can be circulated and used efficiently, and part of it can be used as cooling air for the infrared heating device. For even possible. Further air temperature rise in the circulation that,
This can be dealt with by incorporating a mechanism (not shown) into the circulation duct 20, which allows heat to escape to the outside of the system as needed and which can take in fresh air from the outside of the system at a constant rate.

[0010]

As described above in detail, according to the present invention, since the infrared heating device and the room temperature air supply device are provided between the printing units of the respective colors, the printing ink can be efficiently dried, and the roll is contaminated. Can be prevented. In addition, since the printing ink can be dried in the same space as the conventional one, it is possible to avoid an increase in the size of the apparatus, and further, it is possible to expect high speed and the like, which is an excellent effect.

[Brief description of drawings]

FIG. 1 is a side view showing the whole of a box-making machine printing ink drying system according to an embodiment of the present invention.

FIG. 2 is an enlarged perspective view of the drying unit in FIG.

FIG. 3 is a side view showing an entire conventional box making machine system.

FIG. 4 is a side view showing the whole of another conventional box making machine system.

[Explanation of symbols]

 1'Paper feed unit 4 "Printing unit 15 Dryer unit 17 Infrared heating device 18 Room temperature air supply device

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yasuyuki Baba 5007 Itozaki-cho, Mihara-shi, Hiroshima Mitsubishi Heavy Industries Ltd. Mihara Works

Claims (1)

[Claims] 1. A box making machine for printing a corrugated cardboard sheet, punching out a die to produce a folded corrugated cardboard, and a printing ink drying unit comprising a printing ink heating device and an air supply device at a position immediately after printing of the printing unit. A box-making machine printing ink drying system characterized by being provided with.