JP3474715B2 - Intaglio for intaglio offset printing - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an intaglio plate for offset printing having groove-shaped ink cells.

[0002]

2. Description of the Related Art As shown in FIGS.
In an intaglio offset printing intaglio in which a large number of groove-shaped ink cells 12 are formed in parallel with each other by etching or the like, the end portion 13 of the groove-shaped ink cells 12 has a rectangular planar shape, and the depth thereof is the above-mentioned edge. The part 13 and other parts are the same.

In such an intaglio plate, the groove-shaped ink cell 12 is used.
At the end portion 13 of the squeegee, the blade of the squeegee during squeezing enters the cell 12 at a stretch over the entire width of the cell 12, and the ink in this portion is excessively scraped off, resulting in a variation in the ink amount. There is a problem that the ink film thickness unevenness occurs at the end of the printed line corresponding to.

In order to solve the above problems, Japanese Patent Laid-Open No. 8-2
In Japanese Patent Publication No. 9616, as shown in FIGS. 9 to 11, by making the planar shape of the end portion 23 of the groove-shaped ink cell 22 into a pointed shape, the blade of the squeegee during squeezing is provided at the end portion 23. A method of gradually entering the cell 22 is disclosed.

[0005]

However, as a result of the study by the inventors, regardless of the planar shape of the end portion 23 of the cell 22, the amount of penetration of the groove-shaped ink cell 22 of the printing roll in the depth direction is Since the distance from the position of the tip end 24 of the cell 22 to the tip end 24 is 2 to 10 times the width of the cell 22, the area of the print roll 6 is reduced as shown in FIGS. 12 (a) to 12 (c). It has been found that there is a problem that the amount of the ink 7 received decreases as it goes to the tip 24, and the film thickness of the ink 7 near the printed line end 10 corresponding to the portion of the printing target 8 decreases. .

Further, in the groove-shaped ink cell 22 disclosed in the above-mentioned Japanese Patent Laid-Open No. 8-29616, in which the end portion 23 has a pointed planar shape, the end portion 2 as shown in FIG.
3 has a sharp tip 24, when the printing roll 6 enters the cell 22, the amount of the printing roll 6 entering the cell 22 in the depth direction of the printing roll 6 is extremely sharp at the sharp tip of the tip 24. Since it is small, the ink 7 in the cell 22 does not sufficiently adhere to the printing roll 6, and there is a problem that the ink 7 is turned over at this portion.

Furthermore, when the length of the pointed portion of the end portion 23 becomes longer than the width of the cell 22, the cell 22
The width of each of the cells 22 gradually decreases toward the tip 24 of the cell 22, so that the printed material 8 corresponding to the end 23 is printed.
There is a problem in that the width of the ink 7 in the vicinity of the printed line end 10 gradually decreases and a gentle gradient of the print density occurs, so that the printed line end 10 is not sharp.

In order to solve the above problems, the present invention provides
In intaglio offset printing, it is an object to provide an intaglio offset printing intaglio plate that can prevent printing defects due to uneven ink film thickness and ink curling at the end of a printed line.

[0009]

In order to achieve the above-mentioned object, the intaglio offset printing intaglio of the first invention of the present application is such that the depth of the groove-shaped ink cell is from the proper position in the cell to the vicinity of the tip of the cell. It is characterized in that it is gradually deepened and gradually shallowed from the vicinity of the tip to the tip.

According to the first aspect of the present invention, a decrease in the ink receiving amount of the printing roll due to a decrease in the amount of the printing roll entering the depth direction of the cell toward the tip of the groove-shaped ink cell is reduced. By gradually increasing the depth of the cells to the vicinity and gradually increasing the amount of ink, the amount of ink received by the printing roll can be increased and offset. Therefore, the ink receiving amount of the printing roll at the end portion of the groove-shaped ink cell can be made approximately the same as the ink receiving amount at the portion other than the end portion. Further, at the end of the groove-shaped ink cell, the depth of the cell is configured to gradually decrease from the vicinity of the tip to the tip, so that the ink in the cell can be smoothly transferred to the printing roll. .

In the first invention of the present application, a suitable position in the groove-shaped ink cell is set to be 2 to 1 of the width of the cell from the tip of the cell.
It is preferable that the structure is positioned at 0 times the inner side, because the above-mentioned effects can be obtained more reliably.

In the first invention of the present application, when the planar shape of the end portion of the groove-shaped ink cell is configured to be a semicircular shape having a diameter of the cell, the blade of the squeegee gradually increases from the tip having a small width. Since it enters the cell, the ink is not scraped off excessively at the tip. Further, at the leading edge, the amount of penetration of the printing roll in the depth direction of the cell does not become extremely small, so that the ink of the cell can be sufficiently adhered to the printing roll.

In the first invention of the present application, the end portion of the groove-shaped ink cell has a substantially linear tip having a width of 1/4 to 3/4 times the width of the cell and orthogonal to the longitudinal direction of the cell. However, if the cell width is configured to gradually decrease substantially linearly from a position inside 1/4 to 1 times the width of the cell from the tip toward the tip, the same effect as the above can be obtained. .

The intaglio plate for offset printing of the second invention of the present application is characterized in that the planar shape of the end portion of the groove-shaped ink cell is a semicircular shape having the diameter of the cell as a diameter. .

According to the second aspect of the invention, since the blade of the squeegee gradually enters the cell from the tip having a small width, the ink is not excessively scraped at the tip. Further, since the amount of penetration of the printing roll in the depth direction of the cell does not become extremely small at the tip, the ink of the cell can be sufficiently adhered to the printing roll.

[0016]

[0017]

If the cell width at the tip is less than ¼ times the cell width at the inner side, the amount of the printing roll entering the cell in the depth direction becomes extremely small at the tip, and ink is It is not preferable because it does not sufficiently adhere to the printing roll, and when it exceeds 3/4 times, it is not preferable because the squeegee blade does not sufficiently enter the cell smoothly. Also, if the distance from the tip to the inside of the boundary where the cell width gradually decreases is less than 1/4 times the width of the cell, the squeegee blade does not sufficiently enter the cell smoothly. It is not preferable, and if it exceeds 1 times, the length of gradually decreasing the width of the ink in the vicinity of the printed line end of the substrate corresponding to the end of the cell becomes too long, which is not preferable.

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

In the first embodiment of the present invention, as shown in FIGS. 1 to 3, the intaglio substrate 1 has a width of 0.1 mm and a depth of about 10 μm.
A plurality of m-shaped grooved ink cells 2 are formed in parallel by etching, and the planar shape of the end portion 3 of the cell 2 is a semicircular shape having the width of the cell 2 as a diameter, and the depth of the cell 2 is Is about 15 μm deepest in the vicinity 4 of the tip 9 and gradually deepens from a position 15 0.5 mm inside the tip 9 of the cell 2 to the vicinity 4 of the tip, and gradually becomes shallower from the vicinity 4 of the tip to the tip 9. Is configured.

That is, from the vicinity 4 of the tip to the tip 9
The R surface is provided on the bottom surface of the cell 2 up to so as not to interfere with the transfer of the ink from the cell 2 to the printing roll.

A printing procedure using the intaglio offset printing intaglio having the above structure will be described.

First, as shown in FIG. 4 (a), ink 7 is filled in the groove-shaped ink cell 2 with a squeegee blade 5 in the longitudinal direction a of the cell 2. At this time, at the end portion 3 of the cell 2, the squeegee blade 5 gradually enters the cell 2 from the tip 9 having a small width, so that the ink 7 is not scraped excessively. Next, as shown in FIG. 4B, the ink 7 filled in the groove-shaped ink cells 2 is transferred to the printing roll 6. At this time, the amount of penetration of the print roll 6 in the depth direction of the cell 2 is determined by the position 15 of the cell 2.
Since the amount of the ink 7 decreases from the end to the tip 9 as it approaches the tip 9, a portion of the ink 7 remains in the cell 2 at this portion. By increasing the amount of ink 7, it is possible to offset the decrease in the amount of ink 7 received in this portion of the printing roll 6 and make the amount of ink 7 received in the printing roll 6 uniform. Further, at this time, the depth of the cell 2 is configured so as to be steep from the tip vicinity 4 to the tip 9 but gradually becomes shallow, so that the transfer of the ink 7 to the printing roll 6 at the end portion 3 is smoothly performed. It can be carried out. Then, as shown in FIG. 4C, the ink 7 uniformly transferred to the printing roll 6 is printed on the printing material 8 without remaining. Therefore,
It is possible to perform printing without unevenness in the film thickness of the ink 7 at the end portion 10 of the printed line and printing defects due to the ink 7 being turned over.

In the second embodiment of the present invention, as shown in FIG. 5, the end portion 3 of the groove-shaped ink cell 2 has a width of 0.05 mm which is ½ times the width of the cell 2 and has the width of the cell 2. Has a linear tip 16 that is orthogonal to the longitudinal direction of the cell, and the cell width is linear from the inner side of the tip 16 by 0.05 mm, which is ½ the width of the cell 2, toward the tip 16. The other parts are configured to be the same as those of the first embodiment.

Also in the present embodiment, it is possible to obtain substantially the same operational effect as the first embodiment.

In the second embodiment, the cell width at the tip 16 may be 1/4 to 3/4 times the cell width at the inner side, and if it is less than 1/4 times, the printing is performed. The amount of the roll 6 entering the cell 2 in the depth direction becomes extremely small at the tip 16, and the ink 7 does not sufficiently adhere to the printing roll 6, which is not preferable, and when it exceeds 3/4 times, the blade 5 of the squeegee The smooth entry into the cell 2 is not sufficient, which is not preferable. The distance from the tip 16 to the inside of the boundary where the cell width gradually decreases may be 1/4 to 1 times the width of the cell 2. 5 is not preferable because the smooth entry into the cell 2 is not sufficient, and when it exceeds 1 times,
The length of gradually decreasing the width of the ink 7 in the vicinity of the printed line end 10 of the substrate 8 corresponding to the end 3 of the cell 2 becomes undesirably long.

[0027]

According to the intaglio plate for offset printing of the first invention of the present application, the ink amount of the printing roll decreases as the depth of the printing roll decreases toward the tip of the groove-shaped ink cell. The decrease in the amount of ink received can be offset by gradually increasing the depth of the cells to the vicinity of the leading edge and gradually increasing the amount of ink, thereby increasing the amount of ink received by the printing roll. Therefore, the amount of ink received by the printing roll at the end of the groove-shaped ink cell can be made approximately the same as the amount of ink received at the part other than the end, and printing defects due to uneven film thickness at the end of the printed line can occur. Can be prevented. Further, at the end of the groove-shaped ink cell, since the depth of the cell is gradually shallowed from the vicinity of the tip to the tip, the ink in the cell can be smoothly transferred to the printing roll. In addition, it is possible to prevent printing failure due to ink curling at the end of the printed line.

According to the intaglio offset printing intaglio plate of the second invention of the present application, since the blade of the squeegee gradually enters the cell from the tip having a small width, the ink is not excessively scraped at the tip. In addition, it is possible to prevent printing failure due to a decrease in film thickness at the end of the printed line. or,
At the tip, since the amount of penetration of the printing roll in the depth direction of the cell does not become extremely small, the ink of the cell can be sufficiently adhered to the printing roll, and due to the curling of the ink at the end of the printed line. Printing defects can be prevented.

[0029]

[Brief description of drawings]

FIG. 1 is a schematic perspective view showing a first embodiment of the present invention.

FIG. 2 is an enlarged plan view of a part of the first embodiment of the present invention.

3 is an end view of the AA cut portion of FIG. 2. FIG.

FIG. 4 is a diagram illustrating a printing procedure according to the first embodiment of the present invention, in which (a) is a squeegee process, (b) is an ink transfer process, and (c) is a schematic cross-sectional view showing the printing process. .

FIG. 5 is an enlarged plan view of a part of the second embodiment of the present invention.

FIG. 6 is a schematic perspective view showing a conventional example.

FIG. 7 is an enlarged plan view of a part of a conventional example.

8 is an end view of the BB cutting part of FIG. 7. FIG.

FIG. 9 is a schematic perspective view showing another conventional example.

FIG. 10 is a plan view showing a planar shape of an ink cell in another conventional example.

FIG. 11 is a plan view showing the planar shapes of two other types of ink cells in another conventional example.

FIG. 12 is a diagram illustrating a printing procedure in a conventional example,
(A) is a squeegee process, (b) is an ink transfer process,
(C) is a schematic sectional drawing which shows a printing process, respectively.

[Explanation of symbols]

2 groove ink cell 3 Edge of groove-shaped ink cell 4 Near the tip of the groove-shaped ink cell 9, 16 Groove-shaped ink cell tip 15 The right place in the groove ink cell

─────────────────────────────────────────────────── ─── Continuation of front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) B41N 1/06 B41C 1/02-1/05

Claims (5)

(57) [Claims] 1. The groove-shaped ink cell is configured such that the depth of the groove-shaped ink cell gradually increases from a proper position in the cell to the vicinity of the tip of the cell and gradually decreases from the vicinity of the tip to the tip. Intaglio for intaglio printing. 2. The intaglio plate for offset printing according to claim 1, wherein an appropriate place in the groove-shaped ink cell is located inside the tip of the cell by 2 to 10 times the width of the cell. 3. The intaglio plate for offset printing according to claim 1, wherein the planar shape of the end portion of the groove-shaped ink cell is a semicircle having a diameter of the cell. 4. An end portion of the groove-shaped ink cell has a substantially linear tip having a width of 1/4 to 3/4 times the width of the cell and orthogonal to the longitudinal direction of the cell. The intaglio plate for offset printing according to claim 1 or 2, wherein the cell width is configured to gradually decrease substantially linearly from a position inside 1/4 to 1 times the width of the cell toward the tip. 5. An intaglio plate for intaglio offset printing, wherein the planar shape of the end portion of the groove-shaped ink cell is a semicircle having a diameter of the cell .