JP3528398B2 - Sheet material for gravure printing - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention belongs to the technical field of a sheet-shaped plate material for gravure printing applied to an electronic gravure printing system.

[0002]

The applicant of the present invention is, for example, Japanese Patent Application No.
In the prior application such as No. 229588, a sheet-shaped plate material for gravure printing applied to an electronic gravure printing system, which is an example of intaglio printing, is filed first.

In this prior application example, as shown in FIG. 6, a rectangular sheet material 1 made of a synthetic resin sheet is formed into a flat bag shape by the same synthetic resin sheet. Stored in 2 for use.

The image data area 3 is formed in the substantially rectangular area formed on the surface of the sheet-shaped plate material 1, and the left and right edges 1a of the sheet-shaped plate material 1 are arranged at a constant pitch. The sprocket holes 4 are formed in parallel. Although not shown, an adhesive is applied to the front and rear ends 1b and 1c of the sheet-shaped plate material 1.

The sheet-shaped plate material 1 is housed in the plate material jacket 2 through the plate material inlet / outlet 5 formed at one end of the plate material jacket 2 so that the plate material 1 can be freely inserted / removed in the directions of arrows a and b. The plate material jacket 2 is formed with a pair of left and right sprocket insertion holes 6 and positioning holes 7, a visual inspection hole 8 and an identification bar code-9.

As shown in FIG. 11A, the sheet-shaped plate material 1 is a coating material having a thickness T ₂ of about 25 μm on the surface of a base material 101 having a thickness T ₁ of about 188 μm. 102 is coated and finished with good flatness. The base material 101 is made of a synthetic resin sheet such as polyethylene terephthalate resin, and the coating material 102 is mainly composed of a modified polyester resin or the like and mixed with nitrocellulose or the like. Then, with the coating material 101, which is the surface of the sheet-shaped plate material 1, facing upward, the sheet-shaped plate material 1 can be stored and used freely in the plate material jacket 2 shown in FIG. Has been done.

At the time of plate making, as shown in FIG. 7A, the plate material jacket 2 is loaded into the plate feeding / discharging device 12 of the plate making machine 11, and the sheet-shaped plate material inside the plate material jacket 2 is fed and discharged.
2 is pulled out from inside the plate material jacket 2 in the direction of the arrow a, and as shown in FIG.
Is automatically wound around the outer periphery of the plate cylinder 13 for plate making. At this time, the coating material 102, which is the surface of the sheet-shaped plate material 1 wound around the outer periphery of the plate cylinder 13, is on the outer side.

Then, as shown in FIG. 7B, the laser block 14 is reciprocated in the axial direction of the plate cylinder 13 while rotating the plate cylinder 13 at high speed in the direction of arrow c. The laser beam LB emitted from the laser diode 15 of 14 is irradiated onto the coating material 102 of the sheet-shaped plate material 1 through the collimator lens 16 and the objective lens 17 and the like, and the coating material 102 of the sheet-shaped plate material 1 is shown in FIG. Platemaking is performed so that image data 19 such as a color photograph, which is a recess of submicron order, is engraved in the image data area 3 shown.

The image data 19 formed on the coating material 102 of the sheet-shaped plate material 1 in this manner is shown in FIGS.
As shown in FIG. 3, the depth D ₁ is about 7 to 10 μm,
The pitch P ₁ between the image data 19 is about 60 μm or more.

The image data 19 is image data for each of four types of colors corresponding to four color inks such as cyan, magenta, yellow and black at the time of printing described later.

Therefore, at the time of plate making, digital image information of an image such as a color photograph taken from a multimedia such as a photo scanner or a digital video tape recorder is electronically edited by an image processing computer or the like, and cyan, magenta, yellow, Obtain digital image information for each of the four colors such as black.

The plate feeding / discharging device 12 of the plate making machine 11
The plate material jackets 2 for four colors (4 sheets) are sequentially loaded while being exchanged, and by the plate feeding and plate feeding operations in the directions of arrows a and b by the plate feeding and discharging device 12, four sheet-shaped plate materials of different colors are loaded. 1 is sequentially wound around the outer periphery of the plate cylinder 13.

Then, the laser driving circuit (not shown) of the laser block 14 is driven based on the digital image information for each of the four colors, and the four sheet-shaped plate materials 1 for each color are classified by color. The four types of image data 19 are plate-made.

Next, the four plates for each color prepared as described above are prepared.
The sheet-shaped plate material 1 of one sheet is loaded into the printing machine 21 shown in FIGS. 8 to 10, and a color printed matter such as a color photograph is printed.

The printing machine 21 shown in FIGS.
Is configured in a two-color printing machine, and has upper and lower two-stage printing units 24 each having a plate cylinder 22 and an impression cylinder 23 for performing two-color printing, and each plate cylinder of the upper and lower two-stage printing units 24. Two upper and lower two-stage plate feeding / discharging devices 25 for respectively feeding and discharging the sheet-shaped plate material 1 and a total of four ink units 29 each having an ink pan 26, an ink roller 27, and a doctor blade 28 are provided in the upper and lower two-stage plate cylinders. Two upper and lower two-stage ink supply devices 30 arranged for each of 22,
An ink circulation device (not shown) for selectively circulating four color inks 31 such as cyan, magenta, yellow, and black is provided for the total four ink units 29.

Further, the printing machine 32 includes a paper feed tray 33 in which the printing machines 32 before printing, which are cut into a size such as A3 wide, are stacked and set, and the printing paper 3 which has been printed.
A tape conveyer 3 for sequentially circulating the two printing units 24 with a paper discharge tray 34 that stores two in a stack.
5, a printing paper circulation device 40 including a paper feed cylinder 36, a transfer cylinder 37, a paper take-up cylinder 38, a chain conveyor 39, and the like.

At the time of printing, first, as shown in FIG. 10, four sheets of image data 19 for each of four colors such as cyan, magenta, yellow, and black in a color photograph are preliminarily plate-formed on the front surface. Two of the sheet-shaped plate materials 1 of No. 2 are supplied to the two printing units 24 by the two plate supply / discharge devices 25 shown in FIG. 8 and are automatically wound around the outer peripheries of the two plate cylinders 22.

Next, as shown in FIGS. 9 and 10, the ink units 29 for two colors in the upper and lower two-stage ink supply device 30 are set under the lower and upper two-stage plate cylinders 22, respectively. The ink roll 27 is brought close to the sheet-shaped plate material 1 on the outer periphery of the plate cylinder 22, and the doctor blade 2
8 is brought into contact with the surface of the sheet-shaped plate material 1.

Then, the plate cylinder 22 and the impression cylinder 23 in the upper and lower two-stage printing section 24 are respectively rotated at high speeds in the directions of arrows d and e, and the two ink units 29 for two colors set as described above are arranged. Ink roll 27 on each plate cylinder 22
It rotates at high speed in the direction of arrow f in synchronization with.

Then, inks of four colors such as cyan, magenta, yellow, black, etc. are used by the ink circulation device 3
Two colors of 1 are automatically circulated to the two ink pans 26 in the two color ink units 29 set as described above.

Then, the printing papers 32 stacked and set in the paper feed tray 33 are sequentially taken out from the top by the tape conveyor 35 in the printing paper circulating device 40, and the first color of the first color arranged in the lower stage by the paper feed cylinder 36. The paper is fed to the impression cylinder 23 in the printing unit 24, and the first color is printed on the surface of the printing paper 32.

Then, the printing paper 32 on which the printing of the first color is finished is continuously fed by the transfer cylinder 37 to the impression cylinder 23 of the printing unit 24 of the second color arranged on the upper stage, and the surface of the printing paper 32. Then, the second color is printed, and the printing paper 32 on which the second color has been printed is discharged by the paper take-up cylinder 38 and the chain conveyor 39 into the discharge tray 34 and stacked. It should be noted that the printing cylinder 32 is transferred by the transfer cylinder 37 from the impression cylinder 23 of the first color printing section 24 to the impression cylinder 2 of the second color printing section 24.
While being supplied to 3, the printing ink on the surface of the printing paper 32 is quickly dried by a drying unit (not shown) that blows hot air onto the surface of the printing paper 32.

In each of the printing units 24 for two colors, as shown in FIG.
As shown in FIG.
Direction at a high speed, and at the same time, the lower half of each ink roll 27 is dipped in the ink 31 supplied into each ink pan 26, and each ink roll 27 is rotated at a high speed in the direction of arrow f in synchronization with the plate cylinder 22. By rotating, the ink 31 in each ink pan 26 is applied onto the image data 19 on the surface of each sheet-shaped plate material 1. Then, each doctor blade 28 scrapes off the excess ink on each image data 19 to apply a fixed amount of ink 31 on the image data 19. Then, the printing paper 3 is moved by each impression cylinder 23.
The image data 19 of each sheet-shaped plate material 1 is transferred to the surface of the printing paper 32 by transferring the image data 19 of the sheet-shaped plate material 1 at high speed while pressing the sheet 2 onto the surface of each sheet-shaped plate material 1 at high speed. Two-color printing is performed in which the color image 42 of No. 2 is applied twice on the surface of the printing paper 32.

After the two-color printing is performed on the predetermined number of printing papers 32 in this way, the two printing units 24 of the upper and lower two stages are used.
Two printed sheet materials 1 on the outer circumference of one plate cylinder 22
Is automatically replaced with two new sheet-shaped plate materials 1 by the upper and lower two-stage feeding / discharging device 25, and the ink units 29 for two colors already printed of the upper and lower two-stage ink supplying device 30 are used for two new colors. Replace it with the inking unit 29 and set it again at the bottom of the upper and lower two-stage plate cylinder 22.

Then, a predetermined number of printing papers 32 for which the two-color printing has been completed are set again in the paper feed tray 33, and two new inks 31 of two inks of the two new color ink units 29 are set by the ink circulation device. While automatically circulating the ink in the ink pan 26, the printing paper 32 in the paper feed tray 33 is recirculated to the two printing units 24 by the printing paper circulation device 40 and the two-color printing similar to the above is performed again. 4 color inks such as magenta, yellow and black 3
1 is intended to obtain a color print such as a color photograph in which overcoating is performed.

Therefore, according to this printing machine 21, the plate cylinder 2
By exchanging the sheet-shaped plate material 1 with respect to 2, it is possible to efficiently carry out color printing of a small amount of various types.

[0027]

By the way, as shown in FIG. 11B, the printing paper 32 used in this kind of electronic gravure printing system is a paper material so that a clear color image 42 can be printed. The surface of 321 is coated with a coating material 322 made of a fine powdery glass-based hard member or the like, and the surface of the printing paper 32 is finished with good flatness.

However, the coating material 322 on the surface of the printing paper 32 is easily peeled off during printing, so that the coating material 322 shown in FIG.
As shown in FIG. 4, the peeled hard and fine powder of the coating material 322 and other foreign matter 43 such as dust are
If the foreign matter 43 adheres to the surface 102a of the coating material 102 of the sheet-shaped plate material 1 on the outer periphery of the, the foreign matter 43 is likely to be caught between the surface 102a of the coating material 102 and the doctor blade 28, and the foreign matter 43 is coated with the coating material 102.
The surface 102a of the coating material 102 is dragged on the surface 102a of the coating material 102 by the doctor blade 28 while being bitten into the surface 102a of the coating material 102.
The image data 19 of a is likely to be streaked.

When the streak-like scratches have a width of about 3 μm or more and a depth of about 0.5 μm or more (however, the value of the scratches is empirical), the surface of the printing paper 32 is printed. There is a problem that elongated stripes appear in the formed color image 42, the quality of the color printed matter is significantly impaired, and the doctor blade 28 is easily damaged by the foreign matter 43 at an early stage.

The present invention has been made in order to solve the above-mentioned problems, and the surface of a sheet-shaped plate material during printing is
It is an object of the present invention to provide a sheet material in which image data on the surface of a sheet-shaped plate material is not easily scratched even if foreign matter such as powder of coating material or dust that has been peeled off from the surface of printing paper adheres.

[0031]

Means for Solving the Problems A sheet-shaped plate material for gravure printing of the present invention for achieving the above object is a synthetic resin.
The surface of the base material of the synthetic resin sheet is coated with a coating material in which nitrocellulose is mixed with
At least in the image data area on the surface of the coating material
The depth is 0.5 μm or less, the width is 3 μm or less, and the space is 3
Doctor blade with a large number of micro-grooves of over μm
It is formed to be parallel or oblique to the sliding direction of .

The sheet-shaped plate material for gravure printing of the present invention constructed as described above contains nitrocellulose as a synthetic resin.
The mixed coating material is the base material of the synthetic resin sheet.
Is coated on the surface, and on the surface of the coating material,
At least within the image data area, the depth is 0.5 μm or less.
A plurality of minute grooves having a width of 3 μm or less and an interval of 3 μm or more are formed parallel or oblique to the sliding direction of the doctor blade.
Since it was formed for the purpose of printing, even if foreign matter such as coating material powder and dust on the surface of the printing paper adheres to the surface of the sheet-shaped plate material during printing, the foreign matter will be removed during the scraping work of the ink by the doctor blade. Can be easily and surely released into a large number of minute grooves on the surface of the sheet-shaped plate material.

[0033]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of a sheet-shaped plate material for gravure printing to which the present invention is applied to an electronic gravure printing system will be described below with reference to FIGS. It should be noted that the same structural parts as those in FIGS. 6 to 11 are designated by the same reference numerals to omit redundant description.

First, as shown in FIGS. 1 to 4, the sheet material 1 of the present invention has a coating material 10 which is the surface thereof.
On the second surface 102a, a large number of minute grooves 51 are formed at least in the image data area 3 in a direction parallel to the directions of arrows a and b, which are the sliding directions of the doctor blade 28.

At this time, a large number of minute grooves 51 are formed as shown in FIG.
2 can be formed into a square groove 511, a triangular groove 512 shown in FIG. 2, a corrugated groove 513 shown in FIG. 3, and other various shapes.

The minute grooves 51 have a depth D ₂
Is about 0.5 μm or less, the width W ₂ is about 3 μm or less, and the interval P _{2 is}
Coating material 10 having a thickness of about 3 μm or more.
The image data 19 formed on the second surface 102a is not adversely affected.

A method of forming a large number of minute grooves 51 on the surface 102a of the coating material 102 of the sheet-shaped plate material 1 is to coat the surface of the base material 101 of the sheet-shaped plate material 1 with the coating material 102. It is possible to employ a method of simultaneously processing the coating material 102 and a method of cutting the coated coating material 102 by rubbing the surface 102a of the coating material 102 with a metal brush. The micro-grooves 51 can be processed extremely easily.

When the sheet-shaped plate material 1 of the present invention configured as described above is applied to the electronic gravure printing system shown in FIGS. 6 to 11, during printing, as shown by dotted lines in FIGS. The foreign matter 43 such as powder of the hard and fine coating material 322 separated from the surface of the printing paper 32 and other foreign matters 43 is the surface 102a of the coating material 102 of the sheet-shaped plate material 1.
1 to FIG. 3 when the excess ink 31 on the surface 102a of the coating material 102 of the sheet-shaped plate material 1 is scraped off by the doctor blade 28 even if it adheres to
As shown by the solid line, it can be easily released by dropping it into a large number of minute grooves 51.

Therefore, during printing, the foreign matter 43 is caught between the surface 102a of the coating material 102 of the sheet-shaped plate material 1 and the doctor blade 28, and the foreign matter 43 bites into the surface 102a of the coating material 102. The surface 102a of the coating material 102.
It is possible to prevent inconveniences such as streak-like scratches on the image data 19 and the doctor blade 28 being damaged early by the foreign matter 43.

Therefore, by using the sheet-shaped plate material 1 of the present invention, high-quality color printed matter can always be printed stably, and the durability of the doctor blade 28 is improved.

In addition, in FIG. 5, when a large number of minute grooves 51 are formed on the surface 102a of the coating material 102 of the sheet-shaped plate material 1, the minute grooves 51 are arrows a, b which are the sliding directions of the doctor blade 28. It is formed obliquely in one direction or two directions with respect to the direction.

As described above, when a large number of minute grooves 51 are formed obliquely with respect to the sliding direction of the doctor blade 28, the coating material 102 of the sheet-shaped plate material 1 is printed during printing.
Foreign matter 43 adhering to the surface 102a of the
The image data 1 on the surface 102a of the coating material 102 is easily removed by dropping the foreign matter 43.
This is advantageous because the risk of the streak-like scratches on the blade 9 and the doctor blade 28 being damaged can be further reduced.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above embodiments, and various modifications can be made based on the technical idea of the present invention.

[0044]

The sheet-shaped plate material for gravure printing of the present invention having the above-described structure has the following effects.

Claim 1Sheet material for gravure printing
IsA coating of nitrocellulose mixed with synthetic resin
Coating on the surface of the base material of the synthetic resin sheet
At least the image data on the surface of the coating material.
Depth less than 0.5 μm and width less than 3 μm
Below, the interval was configured to be 3 μm or moreA lot of small groovesDoc
Parallel to the sliding direction of the bladeForming and printing
Foreign matter such as powder and dust of the coating material on the printing paper surface
Even if it adheres to the surface of the plate material,
Foreign matter during the scraping work of the ink
In numerous microgrooves on the surface ofeasilyI can escape
So that it adhered to the surface of the sheet material during printing.
Foreign matter between the surface of the sheet-shaped plate and the doctor blade
An image of the surface of the sheet-shaped plate material that is dragged by being sandwiched between
The data may have streaks, or the doctor
To prevent inconvenience such as damage to the
You can Therefore, high-quality color prints, etc. are always cheap.
In addition to being able to set and print, the doctor blade
Durability can also be improved.

Claim 2Sheet material for gravure printing
IsA coating of nitrocellulose mixed with synthetic resin
Coating on the surface of the base material of the synthetic resin sheet
At least the image data on the surface of the coating material.
Depth less than 0.5 μm and width less than 3 μm
Below, the interval was configured to be 3 μm or moreA lot of small groovesDoc
Printing at an angle to the sliding direction of the blade
The inside of the printing paper may have powder, dust, etc.
Even if an object adheres to the surface of the sheet material, the doctor break
During the work of scraping ink with
Make sure that it easily escapes into the numerous small grooves on the surface of the printing plate material.
Since it is set to the
Between the doctor blade and the surface of the sheet material
It is dragged by being sandwiched between
There is a streak on the data, doctor blade
To prevent the inconvenience of being damaged
You can Therefore, high-quality color printed matter is always stable.
Can be printed on top of
Persistence also improvesbe able to.

[0047]

[0048]

[Brief description of drawings]

FIG. 1 is a cross-sectional perspective view showing an enlarged square minute groove in an embodiment of a sheet-shaped plate material for gravure printing to which the present invention is applied to an electronic gravure printing system.

FIG. 2 is a cross-sectional perspective view showing, in an enlarged manner, triangular fine grooves of the sheet-shaped plate material for gravure printing.

FIG. 3 is a cross-sectional perspective view showing an enlarged corrugated fine groove of the sheet-shaped plate material for gravure printing.

FIG. 4 is a perspective view showing a case where fine grooves of the sheet-shaped plate material for gravure printing are formed in parallel with the sliding direction of the doctor blade.

FIG. 5 is a perspective view showing a case where the minute grooves of the sheet-shaped plate material for gravure printing are formed obliquely with respect to the sliding direction of the doctor blade.

FIG. 6 is a perspective view showing a sheet-shaped plate material for gravure printing and a plate material jacket of a prior application example.

FIG. 7 is a side view of a plate making machine in an electronic gravure printing system of a prior application example and a partially cutaway side view of a plate cylinder for explaining a plate making process.

FIG. 8 is a side view of a printing machine in the electronic gravure printing system of the prior application example.

FIG. 9 is a schematic side view showing a printing unit and a printing paper circulating device in the printing machine of the above.

FIG. 10 is a partially cutaway side view illustrating a printing unit and an inking unit in the same printing machine.

FIG. 11 is a cross-sectional view showing, in an enlarged manner, a state in which a foreign substance is sandwiched between the surface of a sheet-shaped plate material and a doctor blade during printing by the printing machine of the same, and a coating material of printing paper.

[Explanation of symbols]

1 is a sheet-shaped plate material, 101 is a base material of the sheet-shaped plate material,
102 is a coating material for a sheet plate material, 102a is the surface of the coating material, 3 is an image data area, 28 is a doctor blade, 43 is a foreign substance, 51 is a minute groove, 511 is a square minute groove, and 512 is a triangular shape. Microgrooves, 513 are wavy microgrooves, W ₂ is the width of the microgrooves, D ₂ is the depth of the microgrooves, P
₂ is the interval between the micro-grooves.

Claims (2)

(57) [Claims] 1. A synthetic resin mixed with nitrocellulose.
Computing material code on the surface of the base material of the synthetic resin sheet
Is coating, the surface of the coating material, at least the image data area
A, depth less than 0.5μm, width less than 3μm, spacing
Doctor blur but the number of fine grooves that are configured above 3μm
A sheet-shaped plate material for gravure printing, which is formed in parallel with the sliding direction of the board . 2. A synthetic resin mixed with nitrocellulose.
Computing material code on the surface of the base material of the synthetic resin sheet
At least the image data area on the surface of the coating material.
A, depth less than 0.5μm, width less than 3μm, spacing
Has a large number of minute grooves with a size of 3 μm or more
A sheet-shaped plate material for gravure printing, which is formed obliquely with respect to the sliding direction of the board .