JP4442783B2 - Furnisher roll device for gravure printing machine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to pyrimidin Tsu shear roll apparatus in a gravure printing machine, and more particularly, by゛Ka caused thereby become get wet is poor problem when printing with an aqueous gravure ink "Bu version head" of The present invention relates to a finisher roll apparatus capable of solving the problem and increasing the printing speed as compared with the conventional case when printing is performed using an oil-based gravure ink.
[0002]
[Prior art]
In the case of water-based gravure ink compared to the oil-based gravure ink that has been used in the past, there is a feature that can greatly improve the working environment in printing, so that future gravure printing will be in the direction of using water-based gravure ink. Seem.
[0003]
In a conventional oil-based gravure printing machine, the finisher roll 2 is disposed on the opposite side of the doctor knife 5 with respect to the plate cylinder 3 as shown in FIG. It is pumped up by one finisher roll 2 and supplied to the plate surface 3a. In FIG. 3, 6 is an impression cylinder, and 7 is a film to be printed.
[0004]
[Prior art issues]
For this reason, when performing gravure printing using a water-based gravure ink, the above-described conventional structure causes a leakage defect of the ink 4 to the plate surface 3a due to surface tension as an essential drawback because it is a water-based gravure. Furthermore, the higher the rotation speed, the more the ink 4 supplied to the plate surface 3a falls on the ink pan 1 and becomes non-uniform. As a result, the print becomes smudged or "plate fogged", which is good. There is a drawback that printing cannot be performed.
[0005]
In addition, when the gravure printing is performed using the oil-based gravure ink, the above problem does not occur, but because there is a problem such as plate clogging with respect to the drying of the plate surface 3a after the ink is transferred to the film 7, The ink 4 needs to be pumped from the ink pan 1 to the plate cylinder 3, and for this purpose, the finisher roll 2 is arranged on the side opposite to the knife edge 5. However, when the speed of the plate cylinder 3 is increased, the ink 4 drops or scatters from the plate surface 3a of the plate cylinder 3 due to the centrifugal force and the gravity of the ink 4, so that the plate cylinder can be used even when oil-based gravure ink is used. There was a limit to the speed-up of 3 (up printing speed).
[0006]
The present invention has been proposed in view of such points, and the first of the objects thereof is “fogging” and “plate fog” caused by poor wetting in gravure printing performed using a water-based gravure ink. It is to solve the problem. A second object is to increase the printing speed more than ever in oil-based gravure printing.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, the invention described in claim 1 is characterized in that in the finisher roll for a gravure printing machine, a plurality of finisher rolls are arranged in the finisher roll for a gravure printing machine. To do.
[0008]
Furthermore, the invention described in claim 2 is characterized in that the finisher rolls are arranged on both the doctor knife side and the opposite side with the plate cylinder interposed therebetween .
[0009]
Furthermore, in the invention described in claim 3, one or more finisher rolls are further arranged between the doctor knife side and the finisher rolls arranged on the opposite side across the plate cylinder. To do.
[0010]
Furthermore, the invention described in claim 4 is characterized in that printing is performed using a water-based gravure ink in the invention described in claim 1, 2 or 3.
[0011]
Furthermore, the invention described in claim 5 is characterized in that printing is performed using an oil-based gravure ink in the invention described in claim 1, 2 or 3.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
[Example 1]
An embodiment of the present invention described in claims 1, 2, and 4 will be described in detail with reference to FIG.
Reference numeral 1 denotes an ink pan. The ink pan 1 is filled with water-based ink 4, and a plate surface 3 a of the plate cylinder 3 is arranged on the opposite side of the doctor knife 5 across the plate cylinder 3. Ink 4 is pumped and supplied (applied) by the finisher roll 2 and the finisher roll 2 a disposed on the doctor knife 5 side. In the figure, 6 is an impression cylinder, and 7 is a film (printed body).
[0013]
When the finisher rolls 2 and 2a are disposed in the double, the ink 4 is first supplied to the plate cylinder 3 by the finisher roll 2 opposite to the knife edge 5, and then the ink 4 is supplied by the finisher roll 2a. Therefore, the ink 4 adheres well to the plate surface 3a, and the ink 4 does not scatter (drop) even if the speed is increased.
[0014]
・ Experimental example 1
In this Experimental Example 1, the finisher roll apparatus shown in FIG. 1 was used. Plate cylinder (plate depth 13μ, number of lines 350 lines) made by laser engraving on biaxially stretched PP film (20μ thickness) using water-based gravure ink (trade name AQUAECOAL S, manufactured by Toyo Ink Co., Ltd., surface tension 24 dyne / cm) As a result of printing using the printer, good printing was obtained up to a printing work speed of 300 m / min.
[0015]
This is by arranging on both the sides of the doctor knife 5 and the opposite side across the pyrimidin Tsu Shah roll 2 the plate cylinder 3, the plate cylinder 3 without falling ink 4 be faster is the ink pan 1 a result get wet been helped failure to the plate surface 3a is a drawback of water-based gravure ink.
[0016]
Comparative example 1
The finisher roll apparatus (conventional example) shown in FIG. 3 was used. Printing was performed under the same conditions as in Experimental Example 1. However, good printing could be obtained only at a printing work speed of up to 70 m / min.
This, in addition to get wet is poor generation of the plate surface 3a to the surface tension of the aqueous gravure ink 4 itself is large, the plate cylinder 3 Ink 4 of the plate surface 3a as to speed ends up falling into the ink pan 1 Is the cause.
[0017]
[Example 2]
An embodiment of the present invention as set forth in claim 5 will now be described in detail.
・ Experimental example 2
Printing was performed under the same conditions as in Experimental Example 1 except that oil-based gravure ink (trade name NEW LP Super, manufactured by Toyo Ink Co., Ltd., surface tension 17 dyne / cm) was used as the ink. As a result, good printing was obtained even when the printing speed was increased to 350 m / min.
[0018]
Comparative example 2
Using the apparatus shown in FIG. 3 in which the finisher roll 2 is disposed only on the opposite side of the knife edge 5, printing was performed under the same conditions as in Experimental Example 2. As a result, the ink was discharged at a printing speed of 200 m / min or more. Dropping caused printing unevenness, and good printing was not obtained.
[0019]
[Example 3]
An embodiment of the present invention as set forth in claim 3 is shown in FIG. This example between pyrimidin Tsu shear roller 2 and pyrimidin Tsu Shah rolls 2a, an example in which the third pyrimidin Tsu Shah roll 2 b arranged. When this configuration was adopted and printing was performed under the same conditions as in Experimental Example 1, good printing was obtained, and even if the speed was increased to 320 m / min, no ink dropped and good printing was obtained. It was.
[0020]
【The invention's effect】
In the present invention, as described above, the furnisher rolls are arranged on both the opposite side of the knife edge and the knife edge side with the plate cylinder interposed therebetween , or in addition to the above, and further in the middle thereof, so that the ink is applied to the plate surface. Even when an aqueous gravure ink with a high surface tension was used, good printing with no wetting defect and no “fogging” or “plate fogging” was obtained. Therefore, according to the present invention, printing using a water-based gravure ink is possible, and it is possible to cope with environmental problems. Further, in the use of oil-based gravure ink, the printing speed can be increased.
[Brief description of the drawings]
FIG. 1 is an explanatory view of an embodiment in which the position of a finisher roll is arranged on both the doctor knife side and the opposite side with a plate cylinder sandwiched in a gravure printing machine using water-based gravure ink.
FIG. 2 is an explanatory diagram of Example 3 in which the finisher rolls are arranged at three positions.
FIG. 3 is an explanatory diagram of the position of a conventional finisher roll.
[Explanation of symbols]
1 Ink Pan 2, 2a, 2b Finisher Roll 3 Plate Cylinder 3a Plate Surface 4 Ink 5 Doctor Knife 6 Impression Cylinder 7 Film

Claims (5)

  A finisher roll apparatus for a gravure printing machine, wherein a plurality of finisher rolls are arranged in the finisher roll for a gravure printing machine. The finisher roll device for a gravure printing machine according to claim 1, wherein the finisher roll is arranged on both the doctor knife side and the opposite side with the plate cylinder interposed therebetween . 3. The gravure printing machine fan according to claim 2, further comprising one or a plurality of finisher rolls arranged between a doctor knife side and a finisher roll arranged on the opposite side of the plate cylinder. Nischer roll device.   The gravure printing machine of Claims 1-3 performs printing using water-based gravure ink, The finisher roll apparatus for gravure printing machines characterized by the above-mentioned.   The gravure printing machine of Claims 1-3 prints using oil-based gravure ink, The finisher roll apparatus for gravure printing machines characterized by the above-mentioned.

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