JP6233942B1 - Gravure printing plate and gravure printing method using the gravure printing plate - Google Patents

Abstract

The cell provided in the gravure plate is not limited to the fixed concept of square and turtle shell type, and has a cell shape in which doctor wear is difficult. The object of the present invention is to provide a method for producing a gravure plate that examines the shape of a cell that reduces the wear of a doctor blade, improves printing durability, and does not cause moire even in a color pattern using three primary colors. An object is to provide a gravure printing plate that improves stability and a gravure printing method that uses the gravure printing plate and incorporates a new method for eliminating moire. A gravure printing method that reduces the wear of a doctor blade by arranging a generally rectangular cell in a straight line, herringbone, or arrow feather shape so that the doctor straddles the cell and narrows the width. Devise new moire prevention by changing the color depending on the color used. [Selection] Figure 4

Description

The present invention relates to a cell shape provided on a gravure printing plate and a gravure printing method using a gravure printing plate provided with the cell shape.

  Gravure plates used for gravure printing (one of the intaglio printing methods) were manufactured in the past by a method called the conventional method, but now the surface of the printing cylinder on which the copper plating layer is formed is diamond-shaped. A photosensitive resin film is applied to the surface of an electronic engraving gravure printing plate or a printing cylinder on which a copper plating layer is formed by engraving with a needle to form a concave portion (hereinafter referred to as a cell), and a bank (surrounding the cell). The part that becomes the copper plating part that is not corroded is exposed and cured by laser and the uncured part is removed, and then the gravure printing plate (printed after the cell is formed) by direct net gravure plate that corrodes the copper plating and forms the cell In order to make it more suitable, a 6 to 12 micron chromium plating layer is provided in the copper plating bath).

  The process of manufacturing a gravure printing plate using a conventional method involves baking a screen film with a transparent line intersecting at 45 degrees on a gelatin-based photosensitive film called carbon tissue, and then baking a positive film that will be a pattern. After that, the exposed surface was transferred to the copper-plated surface of the gravure plate, and then developed, and a cell (concave portion) for forming a printed pattern was manufactured by impregnating and corroding the next corrosive liquid to the photosensitive film. The shape of the screen film used here has been inherited by the current direct net gravure plate.

  In a gravure printing method where one pixel representing an image (145 microns x 145 microns in the case of 175 lines) is rough, creating a gravure plate at the same screen angle that intersects the three primary colors at an angle of 45 degrees will result in halation called moire. In order to prevent this phenomenon from appearing in the image, it has been dealt with by changing the angle of the screen of each color from 15 degrees to 30 degrees.

  A cell-shaped gravure plate in which regular hexagons called turtle shell plates are stacked is used as a cell provided on a gravure printing plate by inclining a regular square by 45 degrees.

  In any case, a gravure plate that reproduces a tone pattern is manufactured by using a certain number of lines and changing the screen angle as described above (shaking the screen angle). In general, the number of lines used for gravure printing is 175 lines / inch, and in the case of fine characters, 200 lines / inch is 150 for solid patterns (those without tone patterns) that require density. Line / inch screens may be used.

  Further, in these numbers of lines, the ratio of the width of the bank portion and the portion of the cell called the line ratio is 1 pixel at a ratio of 1: 3, 1: 3.5, 1: 4, 1: 5, etc. Is configured.

  As a method for producing a different gravure printing plate, there is an electronic engraving method in which a copper plating layer is continuously engraved with a diamond needle to form cells. The shape of the cell formed by this method is changed by changing the tip angle of the diamond needle to be used, from a shape close to a quadrangle to a diamond shape in which the quadrangle is elongated. This combination of shapes copes with moire during printing.

  Also in the electronic engraving method, a gravure plate that reproduces a tone pattern is manufactured by using a certain number of lines and changing the shape (changing the tip angle to a diamond needle) as described above. Generally, the number of lines used for gravure printing is 70 lines / cm, and in the case of fine characters, 80 lines / cm is 60 in solid patterns (those without tone patterns) that require density. Gravure printing plates are produced with lines / cm or more rough lines.

  These conventionally produced gravure printing plates place emphasis on the reproducibility of the printed pattern in any of the systems described above.

  The gravure printing plate produced in this way is applied with ink by a gravure printing machine, excess ink is removed by a doctor, and the ink of a cell provided on the gravure printing plate is filled, and the ink is applied to the substrate. By being pressed from the nip impression cylinder, it is transferred and printing is completed.

  A prior patent literature survey was conducted, but there was no cell shape or cell shape patent to prevent doctor wear.

  Gravure printing is done by scraping off the ink applied to the gravure printing plate with a doctor blade, filling the cells in the gravure plate with ink and transferring it to the substrate, but the doctor blade is applied to the gravure printing plate. The doctor blade wears because it is pressurized. Examining the shape of the cell to reduce the wear of the doctor blade, by providing a new cell shape of the gravure printing plate, to reduce the wear of the doctor blade, to improve the printing durability and also in the color pattern using the three primary colors It is an object of the present invention to provide a method for producing a gravure plate that does not cause moire, and to provide a gravure printing plate that improves the printing quality stability by preventing wear of a doctor blade and a gravure printing method using the gravure printing plate .

In the gravure plate of the present invention, the shape of a 100% concentration portion cell provided on the plate surface of a direct net gravure printing plate , or the shape of one pixel including a bank forming the cell is parallel with different lengths of two sides consisting of four sides. In the shape of a quadrilateral or trapezoid, a bank is provided along two intersecting sides of one pixel including the bank forming the cell, and one of the two banks is linear with one bank of adjacent pixels. Now and Forever, bank intersecting the bank communicating with the straight line shape is provided at any angle, bank leading to the linearly disposed at an angle in a range of 30 degrees ± respect circumferential direction of the gravure printing plate It is characterized by being.

(The shape of the photosensitive film for producing the gravure printing plate of the present invention and the shape of the produced cell are, for example, about 5 microns by side etching when the corrosion is 25 microns deep (corrosion depth). In the following explanation, the shape of the photosensitive film will be described as being substantially the same as the shape of the cell. In the case of limitation, it is expressed as a photosensitive film and added with explanation.)
(One pixel consists of one cell and bank. In the number of lines and line ratio, the number of lines is calculated from the edge of the bank to the edge of the next bank, and the line ratio is the width of the bank. Therefore, in the present invention, one pixel is provided with a bank along two sides where one pixel intersects, and a portion excluding the bank is described as a cell.)

  A cell composed of squares intersecting at an angle of 45 degrees, which has been used for general purposes, determines the bank surface area and cell surface area by determining the number of lines and the line ratio.

The cell shape provided in the gravure plate of the present invention is such that the two sides of the bank are provided in a straight line at a predetermined angle, preferably in the range of an angle ± 30 degrees with respect to the circumferential direction of the gravure printing plate. It is a cell formed by a bank that intersects with a bank that extends in a straight line at an arbitrary angle.

Thus, two sides of the bank which faces contiguous circumferentially linearly (hereinafter, referred to as bank continuing in a straight line) determines the number of lines and line ratios, bank intersecting the banks of the two sides (hereinafter, cross The gravure plate having an arbitrary cell surface area can be provided by arbitrarily determining the interval between the two intersecting banks.

The effect obtained by the present invention is to receive the pressure of the doctor and reduce the wear of the doctor by a bank that extends linearly in the circumferential direction. This will be described in detail later. (In addition, the bank lined linearly in the circumferential direction can be swung not only in the circumferential direction but also in an angle range of ± 30 degrees with respect to the circumferential direction.)

FIG. 1 shows one pixel having a 175 line / line ratio of 1: 4 as an example of a cell shape of a gravure printing plate that is conventionally used for general purposes. (The surrounding broken lines indicate the surrounding pixels.)
Although one pixel is indicated by a solid line, a cell portion in one pixel is indicated by (A) and a bank portion is indicated by (B). The broken lines provided around indicate the positions of the surrounding cells.
Note that (A) and (B) are also displayed in the one-pixel diagram shown below.

Figure 2 is an example of a cell shape of the present invention, a bank continuous linearly provided in the circumferential direction and 175 lines-line ratio of 1: 4, the bank intersecting the bank continuing in a straight line in a circumferential direction 1 pixel is shown at an angle of 60 degrees, and the area of one pixel, the area of the bank, and the area of the cell are the same as the area of one pixel, the area of the bank, and the area of the cell in FIG. is there.

  The present invention relates to a gravure plate that reduces the wear of a doctor. Comparing FIG. 1 and FIG. 2, the maximum width of a cell hit by a doctor is 100 when the width of a white double arrow shown in FIG. The width of the white double arrow shown in FIG. Therefore, doctor wear of the gravure plate of the present invention having a narrow cell width is reduced.

Next, it will be explained that the width of the cell affects the doctor wear. The narrow width of the cell reduces the wear of the doctor passing through the cell, and the doctor wear is reduced by not contacting the deep portion of the R portion that falls into the cell from the bank. It can be easily inferred from the following example.

If the width of the doctor straddling the cell is small, the doctor wear is small. In the plate making method for forming the cell in FIG. 1, the doctor wear is about 100% concentration part and the doctor wear degree is about 80% concentration part where the cell width is narrow. In comparison, the former can be seen from the fact that doctor wear is more than double.

In addition, when comparing the wear of the 175 line / line ratio 1 to 4 gravure printing plate and the 200 line / line ratio 1 to 4 gravure printing plate, the former doctor wear is severe, so the cell width is narrow. You can see that there is little doctor wear.

  In addition, when the doctor straddles the cell, it causes warping toward the cell bottom. When two types of doctors with different rigidity are used, the ink applied to the plate surface is scraped off and transferred to the substrate. The amount of ink used is higher when a highly rigid doctor is used, and the doctor has less warping when passing through the cell than when there is a print density. When a less rigid doctor is used, You can see that Tawami is big. Therefore, it can be seen that the doctor is in wider contact with the R portion that is not polished by the bank. From this, it can be seen that doctor wear increases as the cell width increases.

The surface enlarged plan view of the gravure plate using one pixel of FIG. 1 is shown in FIG. 3, and the surface enlarged plan view of the gravure plate using one pixel of FIG. 2 is shown in FIG. In the enlarged surface plan view, cells and banks are displayed, and the top of the figure is the circumferential direction of the gravure printing plate and is indicated by a thick arrow.

  In FIG. 3, the bank of the printing plate is formed in a zigzag, and it is considered that the doctor wears back and forth repeatedly by the zigzag in the cell portion and the bank portion, and the doctor wear is promoted. On the other hand, FIG. 4 has a narrower bank width than that of FIG. 1 provided in a straight line in the circumferential direction, and is supported by the same width bank, and the doctor moves smoothly to reduce vibration and change in wrinkles. It is considered that the wear is reduced.

  Further, in order to obtain the same concentration of printed matter by transferring the same amount of ink as the gravure plate provided with the cell of FIG. 1, the cell shape provided in the gravure plate of the present invention is limited to the gravure plate provided with the cell of FIG. A printed matter having the same density can be obtained with an infinite number of shapes.

  As some examples, printed materials having the same density can be obtained also in the gravure plates of the present invention shown in FIGS.

  In Table 1, the cell area, bank area, line ratio, and maximum width over which the doctor straddles the cells when one pixel area of FIG. 1, FIG. 2, and FIG. 5 to FIG. Comparison is made assuming that the width of FIG.

  In the present invention, even if the number of lines is changed, the area of the cells can be made the same by adjusting the interval of the intersecting banks, so that a printed matter having the same density can be obtained. This is the relationship between FIG. 2 and FIG.

  Further, even if the line ratio is changed with the same number of lines, if the width of the bank is adjusted, cells having the same cell area can be obtained, so that a printed matter having the same density can be obtained. This is the relationship between FIG. 8 and FIG.

A description will be added to FIGS. 5 to 9 described in Table 1. FIG.
In FIG. 5, the number of lines is roughened to 165 lines, but the width over which the doctor straddles the cells is 74% of FIG. 1, and the load on the doctor is reduced. In addition, the width of the bank lined up in a straight line becomes wider and can receive the doctor firmly. The printed matter having the same density can be obtained without changing the area of one pixel, the area of the cell portion, and the area of the bank portion.

FIG. 6 shows the number of lines as fine as 187 and 5 lines. With a line ratio of 1 to 3 and 6 to make the width of the bank lined in a straight line, we were able to catch the doctor firmly. Further, the printed matter having the same density can be obtained without changing the area of one pixel, the area of the cell portion, and the area of the bank portion.

In FIG. 7, the number of lines is further reduced to 200 lines. Also about this. The line ratio for securing the width of the bank lined in a straight line was set to 1: 3, 33, and the wear was reduced by receiving the doctor. Further, the printed matter having the same density can be obtained without changing the area of one pixel, the area of the cell portion, and the area of the bank portion.

8 and 9 show the number of lines further reduced to 210 lines. 8 has a line ratio of 1: 4, and FIG. 9 has a line ratio of 1: 3,33. In FIG. 8, the width of the banks that are connected in a straight line is narrow, but the cell width is as narrow as 55%, and doctor wear can be reduced due to the wide crossing banks. Moreover, even if the bank width was wide as shown in FIG. 9, doctor wear could be reduced similarly. Further, the printed matter having the same density can be obtained without changing the area of one pixel, the area of the cell portion, and the area of the bank portion.

Table Thus, a doctor in the present invention, with respect to bank width continuing in a straight line, which is provided in the circumferential direction, the bank width intersecting the hand該土, since it can be any width, shown above the bank width continuing from 1 linearly wide, it is possible to narrow the bank width that is not orthogonal to the hand該土or wider.

Without changing the cell surface area and the linear cell width, the bank width intersecting with the banks provided in a straight line in the circumferential direction can be reduced.

In addition, in the present invention, the angle of the banks that run in a straight line in the circumferential direction can be changed and shaken within a range of ± 30 degrees. However, in the case of FIGS. It is desirable to swing to a range of degrees. In FIG. 10, which will be described later, it is desirable to swing clockwise within a range of 30 degrees.

Gravure plate of the present invention is a direct network gravure printing plate, 1 pixel shape of the provided cells, the number of lines in the bank communicating with the linearly at 250 lines from 100 lines between 1 inch and the linear linear ratio of bank width and cell width of the bank continuing in the 1: 3 1: 6, the bank width of the bank to the intersecting to bank width of the bank communicating with the straight line shape in the 1.5 to 0.3-fold , 1 pixel pitch of banks of said parallel cross to the vertical one-pixel pitch on the bank communicating with the straight cell is characterized by a 3-fold from 0.5 times.

The shape of the cell provided in the gravure plate of the present invention is not limited to that shown in FIGS. 2 to 9. For example, if the angle of the intersecting bank in Table 1 is changed to 50 degrees, the width over which the doctor straddles the cell can be increased. Get smaller.

  The shape of the cell provided in the gravure plate of the present invention can be arbitrarily selected and may be 45 degrees as well as the above 50 degrees. If the cell shape is arbitrarily provided, an infinite shape can be set.

The shape of the cell of the present invention can be selected in various ways, and the gravure surface view shown in FIG. 10 is provided such that the angle of the bank intersecting with the bank lined linearly with respect to FIG. 4 is provided symmetrically. Moreover, FIG. 4 and FIG. 10 may be combined with each other alternately in a row to form an arrow feather pattern arrangement. Moreover, the gravure plate which consists of a trapezoidal cell shown in FIG. 11 may be sufficient.

  The gravure plate of the present invention is the direct net gravure printing plate, and the total length of the intersecting banks in contact with the doctor is the same length regardless of the position where the doctor contacts in the 100% density portion. It is characterized by.

In gravure plate been explained in FIG. 11 from FIG. 2, the position of the bank intersecting to bank continuing in a straight line is placed, the effect on the doctor wear.

  For example, FIG. 12, FIG. 13 and FIG. 14 are plate surfaces of the gravure plate of the present invention, which have the same number of lines, the same bank area, and the same cell area, but the vibrations experienced by the doctor during gravure printing are different.

In FIG. 12, the doctor passes through the bank where the doctor intersects at the same time, and the vibration received by the doctor increases, which is not preferable.

In FIGS. 13 and 14, the doctors are provided with regularity although the arrangements of the banks intersecting the banks that are connected in a straight line are different, and the vibration received by the doctors is dispersed and the doctor wear is reduced. As the difference between the two, it is better to select FIG. 14 in consideration of the leveling of the ink, and FIG. 13 is better to reduce the vibration to the doctor.

Thus, in a gravure plate of the present invention, a width of the total length of the bank width crossing the bank communicating with the a bank width linearly continuous with the straight line is the same length in contact doctor in gravure printing It is preferable that

In addition, one pixel composed of the gravure plate cell and bank according to the present invention shown in FIG. 15 has a rhombus shape having the same length on all four sides (the long side and the short side have the same length). The line ratio between the bank width and the cell width is the same.
FIG. 16 shows an enlarged plan view of the surface of a gravure printing plate that uses one pixel of FIG. 15 and in which intersecting banks are also arranged linearly. In this way, left and right and up and down can be made symmetrical. FIG. 15 is a cross-sectional view of the orthogonal bank shape shown in FIG. 1, in which the banks intersect at different angles. The doctor can wear the doctor by reducing the width of the doctor across the cells with the same cell area and the same bank area. Can be reduced.

The gravure plate of the present invention thus obtained is a gravure plate composed of a 100% density pattern called a solid pattern, a gravure plate composed of a full-color solid pattern, and a 100% density pattern and 100% density or less. If it is used as a gravure plate composed of the above gradations, the wear of the doctor is greatly reduced and the stability of gravure printing can be improved.

The present invention is different from a cell shape in which general-purpose straight lines intersect at right angles, but the reason why the shape of the modified cell of the present invention is not considered and put into practical use is based on the following two fixed concepts. I think it ’s okay.
1. It seems to be because the area of the cell changes if the fixed concept that the cells are formed with equally spaced banks perpendicular to each other and the distance between the banks is changed.
2. Since the innovation in the manufacturing method of gravure printing plate was aimed at improving the design, the cell shape and width would affect the improvement of printing stability of gravure printing due to the fixed concept that the cell should be square This is probably due to the lack of consideration for the above and the idea of using a deformed cell.

In the gravure printing method of the present invention, in a gravure printing plate that prints a color picture using black ink and three primary color inks, the interval between the banks that are linearly connected and the interval between the intersecting banks that intersect the linearly continuous banks The gravure plate 100% concentration cell surface area is the same area , and the pitches of the banks provided in a straight line and the pitches of the intersecting banks in each color gravure printing plate are different from each other. Printing is performed using the direct net gravure printing plate according to any one of claims 1 to 3.

When printing a color pattern on a conventional direct net gravure printing plate, the yellow, red, indigo, and black color gravure plates have the same number of lines, and the screen angle is set within a range of ± 30 degrees. Prevents moire phenomenon. Since cells are formed by orthogonal screens, changing the number of screen lines changes the surface area of the cells, ensuring 100% density color balance in yellow, red, indigo, and ink colors that represent color patterns. This is because they cannot.
Therefore, in order to prevent moire, the color printing plate uses a gravure plate whose screen angle is changed by 15 degrees or 30 degrees.

In the present invention, in order to reduce the wear of the doctor, the swing angle of the banks connected in a straight line in the circumferential direction is reduced, and the number of lines of the yellow, red, indigo and black gravure plates can be arbitrarily set according to the individual plates. Even if the number of lines is changed, the cell surface area with the same concentration of 100% can be secured, and by changing the number of lines, the pitch in the width direction of the gravure plate changes, and the length of the intersecting banks also changes, in other words Since the pitch in the circumferential direction also changes, the occurrence of moire can be prevented.
However, yellow, red, blue, need not be the same angle to the bank in semicircular leading to black color gravure straight, the same number of lines, the same line ratio, by swinging the angle a plate of the same cell area Moire can also be prevented.

  Table 2 summarizes the pitch in the plate width direction and the pitch in the circumferential direction in FIGS. 1 and 2 and FIGS. 5 to 9 described above.

Using a gravure plate of the present invention, can be obtained a print of the same concentrations in 100% concentration section be changed to the number of lines, without changing the angle of bank continuing in a straight line, the printing moire does not occur can do.

1 and the cell of FIG. 5 shown in Table 2, the cell is shifted by 1 pitch at 16 pitches in the plate width direction, and the cell is shifted by 1 pitch at 15 pitches in the circumferential direction. This deviation is one pitch deviation every 2 or 3 mm and is not recognizable as moire, and it is possible to prevent moire without changing the angle of the banks that run in a straight line.

  For example, if yellow, red, indigo, and black color gravure plates representing color patterns are used, the 4th plate of 200 lines, 187, 5 lines, 175 lines, and 165 lines shown in Table 2 of the present invention will cause moire. Colored prints can be obtained.

Even if four types of lines are not used, 175 lines, 187, and 5 lines are used, and the number of the same lines is varied from 5 degrees to 15 degrees, so that a printed matter with a more delicate color pattern. Can get.

  Thus, if the gravure plate of the present invention is used, doctor wear can be greatly reduced, print quality can be stabilized, and a printed matter with good color pattern reproducibility can be obtained. Furthermore, not only was the wear of the doctor reduced, but the generation of doctor streaks, streak stains and whiskers, which were poor quality due to the doctor wear pieces or powder, could be eliminated.

The gravure printing plate of the present invention is a direct net gravure printing plate, and a 100% concentration portion cell provided on the plate surface has a parallel shape in which the shape of one pixel including the bank forming the cell consists of a long side and a short side. It is a quadrilateral, the number of lines on the long side is 100 to 225 lines per inch, and the line ratio that is the ratio of the bank width to the cell width in the short side direction is 1 to 3 to 1 to 6, The short side is the same bank width as the long side, and the center line of the acute angle portion sandwiched between the long side and the short side is an angle within a range of ± 30 degrees from the circumferential direction of the gravure printing plate. The one pixel is arranged as a unit in a herringbone pattern.

  In order to reduce doctor wear, the cells are parallelogram cells with the same length on opposite sides, and one pixel consisting of long sides and short sides is alternately arranged at a fixed angle. By the cell of the present invention, the width of the doctor contacting the cell is narrower than the square cell width inclined at an angle of 45 degrees that has been used for general purposes, and the cell area is the same as the square cell surface area. It is a gravure plate in which wear is reduced and a printed matter having the same concentration can be obtained.

FIG. 17, FIG. 18, FIG. 19, and FIG. 20 illustrate the cell arrangement of the gravure plate of the present invention in an enlarged surface plan view. Note that one pixel is indicated by a broken line in the lower right of each figure.

FIG. 17 is an enlarged plan view of a surface provided on a gravure plate in which one pixel whose long side is twice as long as the short side is combined in a herringbone pattern.

FIG. 18 shows a surface of a surface provided on a gravure plate in which one pixel in which a side whose length is twice the length of a short side is a parallelogram (deformed rectangle) is combined in a herringbone pattern. It is an enlarged plan view.

  FIG. 19 shows a combination of the same parallelograms (deformed rectangles) as in FIG. 18 combined with another herringbone pattern.

FIG. 20 is an enlarged plan view of a surface provided on a gravure plate in which a single pixel whose long side is three times longer than the short side is combined in a herringbone pattern.

  FIG. 21 shows a gravure plate in which a single pixel in which a side whose length of the long side is 1.5 times the length of the short side is a parallelogram (deformed rectangle) is combined in a herringbone pattern. It is an enlarged plan view of the surface.

  One pixel of the parallelogram of FIG. 17 of the present invention is shown in FIG. 22 and compared with FIG. 1, which is a square cell used for general purposes. In addition, the shape was roughly 4 long sides 247 lines, short sides 124 lines, the long side line ratio was 1: 2,8.

FIG. 22 shows the width of the cell where the doctor touches the white double-headed arrow. Compared to FIG. 1, the cell width was a little less than 65%, the bank width was a little over 93%, and the wear of the doctor could be greatly reduced.

In this way, if a gravure plate having cells arbitrarily selected from a rectangle or a parallelogram (deformed rectangle) is used and an arbitrary pattern printing of 100% density called a solid pattern is performed, the cells provided in the gravure plate The doctor that is pressed and contacted is greatly reduced in wear due to less wrinkles in the cell portion, and has a great effect on improving print quality, reducing the number of doctors used, and reducing the work load.

The gravure printing method of the present invention is the direct net gravure printing plate that uses black ink and three primary color inks to print an arbitrary color picture, and the angle of the herringbone pattern is arbitrarily swung to prevent the occurrence of moire. The direct net gravure printing plate according to Item 5 is used.

  In the case of printing a color pattern using a gravure plate having cells according to the present invention, it may be converted into a halftone dot according to the color gradation, and a square used for general purposes in order to prevent moire. As in the case of the cell, moire does not occur if the cell angles are arbitrarily shifted ± 15 degrees and ± 30 degrees for black and the three primary colors.

  This not only reduced the wear of the doctor, but also eliminated the generation of doctor streaks, streak stains, and whiskers, which were poor quality due to doctor wear pieces or powder.

By using the gravure plate of the present invention, the wear of the doctor can be reduced, and the wear pieces and wear powder due to the doctor wear are eliminated or reduced, thereby improving the printing quality. In addition, the amount of doctors used as secondary materials in the printing workplace decreased, leading to improved profits.

Further, the gravure plate of the present invention is generally used with a cell surface area of 100% concentration even in printing of a color picture by arranging approximately rectangular cells in a linear shape, a herringbone shape, an arrow feather shape, or the like. By using the same tone as the square cell surface area and expressing gradation with halftone dots by direct plate making, it was possible to obtain a printing method with less doctor wear and improved print quality.

  In terms of the occurrence of moire, it was possible to prevent the moire of the printed matter by changing the number of vertical and horizontal lines by changing the cell shape by making the cell surface area the same instead of the method of changing the cell angle.

General-purpose 175 lines 1 pixel diagram with a line ratio of 1: 4 175 lines of the present invention One pixel diagram with a line ratio of 1: 4 Fig. 1 is an enlarged plan view of the surface of a gravure printing plate. Fig. 2 is an enlarged plan view of the surface of a gravure printing plate. 165 lines of the present invention One pixel diagram of a line ratio of 1: 4 1-pixel diagram of the 187,5 line ratio 1: 3,6 of the present invention 200 pixels of the present invention 1 pixel diagram of line ratio 1: 3,33 210 pixel line ratio of the present invention with a line ratio of 1: 4 210 pixels of the present invention 1 pixel diagram of line ratio 1: 3,33 1 pixel diagram in which the angle of the intersecting banks in FIG. 5 is symmetric Surface enlarged plan view of cell-shaped gravure printing plate of the present invention Surface enlarged plan view of the gravure printing plate of the present invention Surface enlarged plan view of another gravure printing plate of the present invention Surface enlarged plan view of another gravure printing plate of the present invention 1 pixel diagram consisting of rhombus with 175 lines of the present invention Surface enlarged plan view of gravure printing plate using FIG. Surface enlarged plan view of cell array of gravure plate of the present invention Another surface enlarged plan view of the cell array of the gravure plate of the present invention Another surface enlarged plan view of the cell array of the gravure plate of the present invention Another surface enlarged plan view of the cell array of the gravure plate of the present invention Another surface enlarged plan view of the cell array of the gravure plate of the present invention One pixel diagram of FIG.

  Two versions of the general-purpose direct net gravure plate of FIG. 3 and the direct net gravure plate of the present invention of FIG. 4 were prepared, and the wear of the doctor (cera plating doctor) was compared. A plate with a plate width of 1100 mm and a circumference of 700 mm was used, and the pattern was a solid pattern with a width of 700 mm and 100% density at the center of the plate, and the plate depth was 25 microns.

  For gravure printing, white ink of urethane-based ink was used, the ink viscosity was 16 seconds with Zancup # 3, the doctor pressure was 1, 2 kg, and the printing speed was 200 m / min. The wear of the doctor was measured by measuring the length of the doctor before printing and measuring it after printing 30000 m to examine the wear of the doctor.

  As a result of the above comparison, the direct net gravure plate used for general purposes was worn by the doctor by 0.7 mm, whereas the direct net gravure plate of the present invention was worn by 0.4 mm.

  A similar comparison was made using a yellow ink of urethane-based ink. As a result, the direct net gravure plate used for general purposes was worn by the doctor by 0.5 mm, whereas the direct net gravure plate of the present invention was worn by 0.3 mm.

  The direct cell gravure version of the black, indigo, red, and yellow color patterns (red version is 15 degrees counterclockwise and the indigo version is clockwise). (The yellow plate was swung 30 degrees in the clockwise direction), and the plate depth was 23 microns. In the cell shape of the present invention, the black plate, the indigo plate, the red plate, and the yellow plate, the black plate in FIG. 6, the indigo plate in FIG. 2, the red plate in FIG. 7, and the yellow plate in FIG. Was selected, and a direct net gravure version with a color pattern was produced. In the gravure plate of the present invention, the angle was not changed.

  4 plates of the above-mentioned color pattern and the plate created in Example 1 are used as a white plate, and a direct net gravure plate generally used and a direct net gravure plate having a different number of lines according to the present invention are used. The ink viscosity of each color was set to 14 seconds with Zancup # 3 using a system ink, the doctor pressure was set to 1 and 2 kg, the printing speed was 200 m / min, printing was performed at 30000 m, and the reproducibility and design properties of the color picture were compared.

  In both versions, there was no problem in the reproducibility and design of the color pattern. Moreover, there was no occurrence of moire.

  In Example 2, the color pattern plate of the present invention was printed without changing the angle, but the case where the angle was changed was confirmed in this example.

  Turn the red plate counterclockwise by 15 degrees, change the indigo plate to the symmetric angle instead of Fig. 2, and change the cell shape of Fig. 10 to turn the angle 15 degrees clockwise to make a gravure plate. The same confirmation as in Example 2 was performed. As a result, the reproducibility and design of the color pattern were good and there was no occurrence of moire.

  3 versions of the general-purpose direct net gravure plate of FIG. 3 and the direct net gravure plate of FIG. 17 (one pixel shape is FIG. 22) of the present invention are prepared, and the wear of the doctor (cera plating doctor) is compared. went. A plate with a plate width of 1100 mm and a circumference of 700 mm was used, and the pattern was a solid pattern with a width of 700 mm and 100% density at the center of the plate, and the plate depth was 25 microns.

  For gravure printing, white ink of urethane-based ink was used, the ink viscosity was 16 seconds with Zancup # 3, the doctor pressure was 1, 2 kg, and the printing speed was 200 m / min. The wear of the doctor was measured by measuring the length of the doctor before printing and measuring it after printing 30000 m to examine the wear of the doctor.

  As a result of the above comparison, the direct net gravure plate used for general purposes was worn by the doctor by 0.7 mm, whereas the direct net gravure plate of the present invention was worn by 0.4 mm.

  A similar comparison was made using a yellow ink of urethane-based ink. As a result, the direct net gravure plate used for general purposes was worn by the doctor by 0.5 mm, whereas the direct net gravure plate of the present invention was worn by 0.3 mm.

  The direct cell gravure version of the black, indigo, red, and yellow color patterns (red version is 15 degrees counterclockwise and the indigo version is clockwise). (The yellow plate was swung 30 degrees in the clockwise direction), and the plate depth was 23 microns. Similarly in the cell shape of FIG. 17 (one pixel shape is FIG. 22) of the present invention, a direct net gravure plate of black, indigo, red, and yellow color patterns (the red plate is 15 counterclockwise). The cell angle was 15 degrees clockwise for the indigo plate and 30 degrees clockwise for the yellow plate), and the plate depth was 23 microns.

  Using 4 plates of the above-mentioned color pattern and the plate created in Example 3 as a white plate, using a general-purpose direct net gravure plate and the direct net gravure plate of the present invention, using urethane ink The ink viscosity of each color was set to 14 seconds with Zancup # 3, the doctor pressure was set to 1, 2 kg, the printing speed was 200 m / min, printing was performed at 30000 m, and the reproducibility and design properties of the color patterns were compared.

  In both versions, there was no problem in the reproducibility and design of the color pattern. Moreover, there was no occurrence of moire.

A Cell portion occupying 1 pixel B Bank portion occupying 1 pixel

Claims (6)

The shape of a 100% density cell provided on the plate of a direct net gravure printing plate , or a parallelogram or trapezoidal shape in which the shape of one pixel including the bank forming the cell is composed of four sides and the lengths of two sides are different. A bank is provided along two intersecting sides of one pixel including the bank forming the cell , and one of the two banks is linearly connected to one bank of adjacent pixels. The banks intersecting with the banks that are connected to each other are provided at an arbitrary angle, and the banks that are connected to the straight line are provided at an angle within a range of ± 30 degrees with respect to the circumferential direction of the gravure printing plate. Gravure printing plate. The number of lines in the bank communicating with the linearly at 250 lines from 100 lines between 1 inch and the line ratio of the bank width and cell width of the bank communicating with the linearly from 1 to 3 1: 6, the straight continuous 1.5 times the bank width of the bank from 0.3 times to the intersection to bank width of the bank, the bank of said parallel cross to the vertical one-pixel pitch on the bank communicating with the straight cell 1 2. The gravure printing plate according to claim 1, wherein the pixel pitch is 0.5 to 3 times.   The total length of the intersecting banks in contact with the doctor is the same length regardless of the position where the doctor contacts in the 100% density portion of the direct net gravure printing plate. The gravure printing plate according to claim 1. In gravure printing plate for printing a color picture by using a black ink and three primary color inks, determined bank intervals continuing in a straight line, and the spacing of the bank of the intersecting cross on the bank communicating with the linearly Optionally, the gravure plate The cell surface area of 100% concentration of the above is the same area , and the pitch of the banks provided in a straight line and the pitch of the intersecting banks in each color gravure printing plate are different to prevent the occurrence of moire. A gravure printing method comprising printing using the direct net gravure printing plate according to claim 1. The 100% density cell provided on the plate of the direct net gravure printing plate is a parallelogram in which the shape of one pixel including the bank forming the cell is composed of a long side and a short side. The number of lines is 100 to 225 lines per inch, and the line ratio, which is the ratio of the bank width to the cell width in the short side direction, is 1: 3 to 1: 6, and the short side is the same bank width as the long side. A center line of an acute angle portion sandwiched between the long side and the short side is an angle within a range of ± 30 degrees from a circumferential direction of the gravure printing plate, and a herringbone pattern with one pixel as one unit A gravure printing plate characterized by being arranged in 6. The direct mesh gravure printing plate according to claim 5, wherein the angle of the herringbone pattern is arbitrarily changed to prevent the occurrence of moire in a direct mesh gravure printing plate that uses black ink and three primary color inks to print an arbitrary color pattern. A gravure printing method using the method.

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