JPH04148931A - Preventing method for printing defect in gravure, and gravure printing block - Google Patents

Abstract

PURPOSE:To prevent linear and planar fogs by forming fine grooves extending in a direction across the circumferential direction of a gravure printing block at non-printing image parts on the surface of the block and not only forming these fine grooves but also abrading other parts except the fine groove parts to a given level or below in surface roughness. CONSTITUTION:Fine grooves 18 are formed on a block 15 in a direction across the circumferential direction of the block and, even in the case where a foreign matter 11 is held between the block 15 and a doctor 8, the foreign matter 11 is caught in one of the fine grooves 8 at the time when the fine grooves 18 pass under the doctor 8 by the rotation of the block 15, and is discharged in the rotational direction of the block from a gap between the doctor 8 and the block 15. Accordingly, printing defect due to a liner fog is not caused. Then, the surface of the gravure printing block 15 is abraded smoothly to the level of 0.08S or below in surface roughness so as to minimize and smoothen the protruding parts of irregularity of the surface. As a result, when the doctor scrapes off excess ink on the surface of the block, the doctor does not bounce up, and ink can be favorably scraped off so as to prevent a planar fog.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention + J-grahier printing method for preventing printing defects and the gravure printing plate used therein, particularly for preventing line-shaped fogs and wide areas that occur in the printing direction on the printing surface. The present invention relates to a method for preventing printing defects in gravure printing and to a gravure printing plate that prevents thinning or waving on a surface.

(Prior art) A plate used for gravure printing is made as shown in FIG. and its copper surface 1
A thin film of silver is formed on the plate, a copper plating layer 2' is formed by applying a copper plating layer 2', and a hole to form a pattern is dug in the copper plating layer 2 to form a cell 3. In order to improve the wear resistance of the 1st edition, the entire outer circumference is curved with I:1 mmenogi.
J., plating layer 4 is formed. To perform gravure printing using the plate 5 formed in this way, as shown in FIG.
7, scrape and drop the excess ink that has entered the cell with the doctor 8, and push the ink that has entered the cell onto the plate 5 with pressure 11P+9 (=t
The stamped mark [jil14A' IO is transferred and printed.

(Problem to be solved by the invention) In this gravure printing, although the in 4- on the surface of the non-image area of the first plate 5 is scraped off with a doctor, the Jl' image line on the printing material The ink may be transferred to the area.

There was the problem of living in so-called Kafuri. There are various types of fog, and the representative ones are linear fog, which is relatively thick in the printing direction, and thin (cow white). .

The present invention was made in view of such conventional problems, and
The purpose is to provide a method for preventing printing defects that can prevent relatively dark streaks or streaks.

Another object of the present invention is to provide a method for preventing printing defects that can further prevent surface thinning or curling.

Still another object of the present invention is to prevent linear and planar fogging.
) We provide two types of gravure printing plates.

[Means to solve the problem]

The present inventors investigated the cause of the above-mentioned linear and cloudy appearance.
As a result, we found the following points. However, as shown in FIG. 15, if a foreign object 11 such as solid ink, lid abrasion powder, or scraps of printing material gets caught between the first plate 5 and the doctor 8, the foreign object 11 will be removed. However, when the lid 8 is pressed locally, a space 12 is created between the two, and the ink leaks out from the space 12, leaving a cotton-like ink in the non-printed areas of the first plate. This was transferred to the printing material H, resulting in a fluffy fluff. Therefore, it is considered possible to prevent one-line fogging by removing the foreign matter 11 from between the plate and the doctor.

Further, as a result of examining the cause of one-sided fogging, it was found that 1. - fogging is caused by minute convexities on the surface of the non-printing area of the gravure printing plate.・Generally, the surface of the plate is 0.
It is said that the surface phase is about 1S, and the surface phase of this level [n1
It was thought that if it was too rough, it would not grow. This is due to the following reason. Of course, when excess ink is scraped off with a doctor, ink remains in minute depressions on the surface, but if the residual ink only exists in a depression of about Q There will be no drying and transfer by the time you reach the transfer position to printing 10A.
For this reason, it is sufficient that the thickness of one surface *■ is about 0.1 S.
Further smoothing was considered unnecessary. When scraping off excess ink with the Yogoro Tokuku, the doctor bumps into minute convexities on the surface of the plate and jumps up, making it impossible to scrape off the ink properly and causing damage not only to the inside of the gates on the surface of the third plate, but also to the concave and convex portions. The ink remained on the lower side of the printing material, and this residual ink was transferred to the printing material, resulting in a surface-like swirl. In order to prevent the doctor from bouncing due to minute protrusions on the plate surface, it is effective to flatten the tips of the protrusions on the plate surface.To do this, the plate surface must be further polished to flatten the tips of the protrusions. We have found that increasing smoothness is effective.

The first invention of the present application was made based on this knowledge.

The gist of this invention is a method for preventing printing defects in gravure printing, which is characterized by forming microgrooves extending in a direction intersecting one circumferential direction in a non-image area on the surface of a gravure printing plate.

In addition, the second invention of the present application is not limited to forming minute grooves marked 1- in the non-printing area on the surface of the gravure printing plate, and the area excluding the minute grooves is 0.083 to 1. The gist of this invention is a method for preventing printing defects in gravure printing, which is characterized by polishing the surface of the surface.

Furthermore, the first invention of the present application is that the non-printing area on the surface of the first printing plate has a direction intersecting with the circumferential direction +i=+ [11 tatami extension minute ii4?
i: The surface of the non-image area excluding the micro grooves is o
, 085 or less.

The present invention will be explained in more detail below with reference to one drawing.

FIG. 1 is a schematic perspective view of a gravure printing plate (hereinafter simply referred to as the plate) 15 used in the present invention. The printing plate 15 has a pattern area 16 in which many cells are formed and a non-image area 17. In the present invention, this plate 15 is used to prevent linear fogging.
It is characterized by forming a large number of minute holes 18 extending in a direction intersecting the circumferential direction in the non-image area I7. Even if a minute foreign matter 11 is caught between the doctor blade 8 and the plate surface as shown in FIG. It is provided so that the foreign matter 11 is caught and discharged from below the doctor 8 as shown in FIG. 2(b). This micro groove 1
The groove 8 is formed extremely shallowly so that the ink remaining in the groove is not transferred to the printing material. In other words, since the micro grooves are recessed from the plate surface, even if the excess ink is scraped off with the lid, there is a possibility that ink will remain in the micro grooves and be transferred to the printing material. By the time the ink remaining in these micro grooves reaches the contact device with the printing material, only a small amount of ink remains, so that it dries and is no longer transferred. The depth of suffering is selected to be shallow. The depth of the microgrooves is preferably about 0.2 to 0.3 In1. In addition, the interval between micro IT4 is 1 to 10 m1
About 11 is preferable. In addition, if there is a part (for example, a part corresponding to the part to be cut and removed from the broken egg 1iill shrine after 1st printing) that may be transferred to the 5th printing surface - part other than the pattern on the 7th part, there will be a minute transfer to that part. It is preferable to form grooves, and in that case, it is not necessary to set the depth of the minute grooves to be shallow so as to prevent ink transfer.

It is also possible to use a cell similar to a normal picture part as a microgroove.

[0] The minute holes 18 to be formed on the surface of the printing plate at the cross-cuts may be provided in all +fii of the non-image area 17 on the surface of the 7th printing plate, or may be provided only in the - portion. However, it is necessary to provide it across the entire width of the printing area of one plate (the printing width in the axial direction of the plate).

The fine grains 18 used in the present invention are abrasive grains Y-
It can be formed by pressing a previously removed abrasive +3 onto the surface of the plate and moving it in the axial direction of the plate. The formation of these microgrooves is usually done mechanically using a polishing machine, but this is not limited to this case; one worker may also manually polish the plate (moving it in the axial direction while pressing A). .

The formation of the minute holes 18 may be performed on the copper plating layer before and after cell making.
It may be performed for layers.

By forming a minute (M) in the II-image area of the first plate 15 as shown in I- below, it is possible to remove foreign matter caught between the doctor and the plate surface and prevent linear fogging. ,
This method cannot prevent surface fogging. According to the present invention, in order to prevent one-sided curling, the surface of the first printing plate is polished to a smoother surface than before, thereby reducing the unevenness of the convex portions on the surface. The degree of polishing is 0.08 per surface roughness.
Select so that it is less than or equal to S. Note that the surface roughness is 0.0.
Even if the surface roughness is much smaller than 8S, it is effective in preventing surface roughness, but even 0.0BS has an I-valve effect, and if the surface roughness is made too small, polishing takes time and is uneconomical.

Therefore, it is preferable that the lower limit of the size of one surface I is set to i:I: 0.05S.

As a method of polishing the surface of the plate 15 to a surface roughness of 0.083 to 1ζ, mechanical polishing using abrasive grains of #3000 to #5000 can be used. At this time, the form of use of the abrasive grains is not limited to the following.For example, a method of using an abrasive material with abrasive grains attached to a base material such as a film, a method of using it in the form of a grindstone, a method of using it as a free abrasive grain. Strength, etc. is optional. During polishing, the conventional plate surface of approximately 0.1 S may be directly polished with abrasive grains of #3000 to #5000. ) is recommended.

In addition to the mechanical polishing method described in L, methods for polishing the surface of the plate include chemical mechanical polishing in which chemical polishing using a corrosive liquid and n-mechanical polishing using abrasive grains are performed at the same time, or electrolytic polishing and m-mechanical polishing using abrasive grains. At the same time, electrolytic abrasive polishing can be performed. The abrasive grains used in these polishing methods are #2
000 to #6000 are suitable.

The abrasive grains used may be either free abrasive grains or fixed abrasive grains.

When performing the polishing described in i! Jl may be either before or after the formation of the above-mentioned microgrooves. When polishing the plate surface after forming micro grooves, care should be taken so that the previously formed micro grooves do not disappear due to the polishing.

Also, the surface of the first plate is polished first, and then microscopic polishing is performed. 1
11, when forming micro grooves, the edges of the grooves may protrude, so remove these protrusions and lightly polish the surface of the printing plate 41 times. Delicious.

[Function] As shown in FIG. 2 (21), if a minute hole 18 is formed on the second plate 15 in a direction transverse to the circumferential direction, the foreign matter II will be removed from the second plate 15.
Even if the foreign object 11 is caught between the IJ and the doctor 8, the rotation of the third plate 15 causes the foreign object 11 to get caught in the minute groove 18 when passing through the minute groove 4 of the doctor 8, as shown in Fig. 2 (b). ), the liquid is discharged from between the first actuator 8 and the plate 15 in the direction of the rotating force of the plate. As a result, the linear cap 1
71- No printing defects due to ).

Next, by smoothing the surface of the gravure printing plate 15 with a surface roughness of 0.083 or more and a thickness of 0.083 or more, the convexes and convexities on the surface are reduced and smoothed. For your consideration,
[The lid does not scrape off excess ink on the surface of the plate, eliminating splatter in the gap, allowing good ink scraping, and preventing five-sided fogging.

Further, since the wear of the doctor blade is not reduced, it is possible to scrape off ink well over a long period of time, and it is possible to prevent blurring. This point will be explained with reference to the drawings. FIG. 4 shows an exaggerated view of the surface of a conventional plate 50 (surface roughness of about 0.IS). The surface of this plate 5 has minute irregularities, and the convex portions 13 are relatively sharp. When the ink 7 on such an uneven surface is not scraped off with a doctor, the lid hits the convex portion 13 and there is a mess in the splashing, and the ink cannot be scraped off properly. As described above, there is a possibility that the ink 7 remains not only in the concave portions but also the entire concave portions and convex portions thereof, and this ink 7 is transferred onto the printing material and forms a planar fog. On the other hand, 2. As shown in Figure 3, the smooth polished plate surface has some unevenness, but the tops of the convex portions 14 are relatively flat, making it easy to scrape off ink with a scrubber. The ink 7 remains in the recess. The minute amount of ink 7 in this recess dries before it comes into contact with the printing material, so it is not transferred to the printing material, and for this reason, there are no words to describe one-sided fog. do not have. In this way, printing defects due to surface fogging can be prevented.

(Example) First, a method for forming microgrooves on the surface of the first printing plate will be explained.

FIG. 5 is a schematic perspective view showing one example of a method for forming the micro grooves 1B in the plate 15. Version 1.5 used here J,
It may be one in which a copper coating layer is formed before cell making, one in which cell making is applied to the copper coating layer, or one in which a chrome plating layer is further formed on the L.

The plate 15 is rotated at low speed as shown by arrow A, and a belt-shaped abrasive material 20 having abrasive grains on the surface is applied to the gono and roll 2.
While pressing with step 1, feed it little by little in the direction of arrow B. At the same time, the plate 5 is polished (A20 and the rubber roll 21 are reciprocated in the axial direction of the plate 5 as shown by arrow C). A microscopic groove 18 is formed.
The depth of No. 8 is determined mainly by the size of the abrasive grains used in the abrasive material 20, so by using abrasive grains of about #600, foreign matter can be removed without causing ink transfer as described in -. Microscopic depth that can be discharged? 14 can be formed.

The formation of the minute holes 18 is limited to the case of using a band-shaped abrasive material as shown in FIG. 5, but other methods are also possible. For example, as shown in FIGS. 6A and 6B, fine grooves in the axial direction can be formed on the surface of the first printing plate 15 by moving the wheel-shaped abrasive material 23 in the axial direction of the printing plate 15 while rotating. In this case as well, it is preferable to use abrasive grains of about #600 to be attached to the abrasive material 23.

Next, a method of polishing the surface of the first plate will be explained.

FIG. 7 is a schematic perspective view showing an example of a method for polishing the plate surface to a smoothness of 0.08 S or less. Reference numeral 15 denotes a plate to be polished, which may be after or before the formation of the above-mentioned microgrooves.

The plate 15 is held at both ends by rotating shafts (not shown) and is rotated at high speed (for example, 400 rpm) in the direction shown by arrow A.
, is there. Apply polishing abrasive grains to the surface of the base material such as Firno on this plate 15. Push the young abrasive material 25 with a rubber roll 26; send. At the same time, the entire plate 15 is moved in the axial direction as shown by the arrow C little by little while being swung as shown by the arrow C. Thereby, the entire plate surface can be polished by the abrasive grains attached to the abrasive material 25. By using #3000 = #5000 abrasive grains as the abrasive grains attached to the iron and the abrasive material 25 of the iron, at least in the final polishing process, smoothness with a 2 surface roughness of 0.08 S or less can be obtained. be able to.

Fig. 8 is a schematic perspective view showing another example of a method for polishing the plate surface to a smoothness of 0.08 S or less, Fig. 9 is a schematic sectional view thereof, and Fig. 10 is a schematic side view thereof. be. In Figures 8 to 10, 15 is the plate to be polished;
Its both ends are held by rotating shafts (not shown), and it rotates in the direction indicated by the arrow. An abrasive material 28 made by attaching abrasive grains to the surface of a base material such as a film on this plate 15
is pressed with two rubber rolls while feeding it little by little in the direction of arrow B. At the same time, a corrosive liquid such as dilute hydrochloric acid and 5 dilute sulfuric acid is supplied from the corrosive liquid supply nozzle 30 just before the polishing position. As a result, the surface of the first plate is mechanically polished by the abrasive grains, and the passive oxide film on the surface of the first plate is removed by the abrasive grains and corroded by the corrosive solution, resulting in rapid polishing.At this time, the surface of the first plate is polished. Since the convex portions with fine irregularities preferentially release the solution L-1 by the corrosive liquid, a smooth polished surface with the tips of the convex portions smoothed can be obtained.The abrasive material 28, the rubber roll 29, the corrosive liquid supply nozzle 30, etc. are polished. As it progresses, it moves along the plate 15 as shown by arrow C, thereby polishing the entire surface of the plate 15.

At the same time, the cleaning liquid supply nozzle 31 moves for a certain period of time with respect to the abrasive material 2B and the corrosive liquid supply nozzle 30, and supplies a cleaning liquid such as water or a neutralizing agent to the surface polished by the abrasive material 28 and the corrosive liquid. Wash away or neutralize the corrosive liquid remaining on the plate surface. This prevents further corrosion from progressing and keeps the surface of the first plate smooth.

By the following method, the surface of the first plate can be polished to a smoothness with a surface roughness of 0.088 or less. This method has the advantage of being able to perform polishing more quickly than the mechanical polishing method described in FIG.

FIG. 11 is a schematic perspective view showing still another example of the method of polishing the plate surface to a smoothness of 0.08 S or less;
The figure is a schematic side view thereof. In FIGS. 11 and 12, reference numeral 15 denotes a polished plate, which is held at both ends by rotating shafts (not shown) and rotated in the direction indicated by arrow A. Reference numeral 33 denotes an electrode having approximately the same length as the plate 15, one end of which is attached to an arm 34 which is rotatably held, and is pressed against the plate 15 by an air cylinder 35. A porous and soft elastic material 36 such as urethane is attached to the electrode (3). 37 is a discharge nozzle for supplying an electrolytic solution 3B containing abrasive grains; It is a DC power supply connected to the

With the electrode 33 pressed against the plate 15 via the elastic material 36, the plate 15 rotates in the direction of the arrow, and at the same time, an electrolytic solution 38 containing abrasive grains is discharged from the discharge nozzle 37 to the plate 15 and the elastic material 36. will be supplied between. Direct in this condition? A current is caused to flow between the plate 15 and the electrode 33 by the Ji power source 39.

As a result, the surface of the 5th plate is mechanically polished by the abrasive grains.
The passive oxide film on the surface of the plate is removed by the abrasive 11'i, and the metal on the surface of the plate is eluted into the electrolyte at Q, resulting in rapid polishing. In electrolytic polishing, the convex portions of minute irregularities on the surface of the first plate are preferentially exposed 780 to the electrolytic solution, so that a smooth polished surface with smoothed tips of the convex portions can be obtained. In this force method, the abrasive grains may be attached to the surface of the elastic material instead of being mixed into the electrolyte. By the above method, the plate surface can be polished to a smooth surface with a surface roughness of 0.08 S or less. This method also has the advantage of being able to perform polishing more quickly than the mechanical polishing method described with reference to FIG.

More specific examples will be described below.

Example 1 A plate 15 on which a chrome plating layer was formed (length 700 mm, diameter 200 mm, surface thickness approximately 0.IS) was prepared, and minute holes 18 were formed on this plate 15 by the method shown in FIG.

At this time, the rotational speed of the plate 15 was lorpm, the width of the abrasive material 2° was 50+nm, the reciprocating stroke of the abrasive material 20 in the B direction was 5n+m, and the reciprocating speed was 1500 times/min. As a result, minute pores 18 could be formed on the entire surface of the plate 15.

Next, when a printing test (using oil-based ink and water-based ink) was performed using plate 15, no linear gaps were observed. Incidentally, there were cases where a slight amount of clouding occurred on a thin surface.

Example 2 A plate 15 on which a chrome plating layer was formed (length 700 mm, diameter 200 mm, surface roughness approximately 0.iS) was prepared, and this plate 15 was polished by the method shown in FIG. that time,
First, as polishing +125, use a 5011111 width with #2000 abrasive grains removed and set the rotation speed of the first plate 15 to 400 rρrn, and the moving speed of the abrasive material 25 in the direction of the arrow to 4.
．． Reciprocate 10 times at 50mm/min, then #3000
An A9 plate surface was polished by reciprocating 10 times under the same conditions as above using an A25 (with the same width of abrasive grain attached).

Next, minute holes 18 were formed on the thus obtained plate 15 in the same manner as in Example 1.

After that, use the method shown in Fig. 7 again to #30000]
Attaching abrasive grains & polishing (A25 1 under the same conditions as above)
The first plate surface was polished again by going back and forth several times.

As described above, a plate with a smooth 1ilTFi'l sheet and minute grooves formed on the entire surface was obtained. Fine I of the plate surface at this time
J stomach? The surface roughness of the parts other than 4 was 0.07 S. Using this plate, we conducted 8 printing tests (using oil-based inks and water-based inks) to investigate the occurrence of smudges. I could hardly even see it.

Example 3 The same operation as in Example 1 was carried out to form minute patterns 18 on one plate surface.

Next, the plate was subjected to chemical mechanical polishing by the method shown in FIG. At that time, the polishing strip ('l) is that the rotational speed of the first plate 15 is 1.00 rpm, the width of the abrasive material 28 is 50 mm, and the polishing 4
The abrasive grain attached to A28 is #4000. The distance between the polishing month 28 and the cleaning liquid supply nozzle 31 is 50 mm, polishing +A'28
and the feeding speed of the corrosive liquid supply nozzle 30 in the direction of arrow C is l.
Oo 11111/min, corrosive liquid 5% by weight dilute sulfuric acid,
The supply rate was about 15 cc/min, and the cleaning liquid was water (J) (The supply rate was about 150 cc/min.) As a result, a plate was obtained in which one plate surface was polished smooth and minute ?tG was formed on the entire surface. The surface roughness of the surface of the plate other than microscopic areas was 0.053. Using this plate, we conducted a printing test (using oil-based ink and water-based ink) and investigated the occurrence of fogging. , oil-based ink, and water-based ink, there was no linear five-sided fog.

Example 4 Micro grooves 18 were formed in the printing plate by the same operation as in Example 1.

Next, the plate was subjected to electrolytic abrasive polishing 1γ by a method not shown in FIG. The polishing conditions for the ribs are as follows: The rotational speed of the plate 15 is 1100 rpm, the current density between the plate 15 and the electrode 33 is 0.1 A/(m, and the electrolyte is an aqueous solution of NaN0.
The mixed abrasive grain size is #4000. The polishing time was about 3 minutes.

As described above-1-1, the first printing plate surface was polished to obtain a printing plate with minute holes formed on the entire surface. At this time, the surface roughness of the portions other than minute) 14 on the plate surface was 0. It was fl 5S. Using this plate, we carried out a printing test (using oil-based ink and water-based ink) to investigate the occurrence of 2-color curls. Tomo no Kaburi/1. It wasn't.

〔Effect of the invention〕

As described above, according to the present invention, minute grooves are formed in the non-printing area on the surface of the first plate in a direction that intersects with the circumferential direction, so that there is no hard foreign matter between the plate and the doctor during printing. Even if the ink is caught, the foreign matter gets caught in the micro grooves formed on the plate surface and comes off between it and the doctor, preventing the doctor from scraping the ink incorrectly and preventing the occurrence of cotton-like flakes. Effects can be obtained.

In addition to providing the above-mentioned fine grains, by polishing the surface of the first plate extremely smooth to a surface roughness of 0.08 S or less, ink scraping by the doctor is ensured and the occurrence of one-sided fogging is avoided. It can be prevented.

[Brief explanation of the drawing]

Fig. 1 is a schematic perspective view of one example of the plate used in the present invention, Fig. 2 (a), (b) T, I: Expanded cross-section of the main part of the plate to explain the foreign matter removal effect by the micro grooves formed on the plate surface Figure 3 is a schematic cross-sectional view exaggerating the surface condition of the plate after polishing, Figure 4 is a schematic cross-sectional view exaggerating the surface condition of a conventional plate, and Figure 5 is a schematic cross-sectional view exaggerating the surface condition of the plate after polishing. A schematic perspective view of the shield, not showing the process of forming it. FIG. 6B is a schematic side view and cross-sectional view showing a modification of the process of forming microscopic particles, and FIG.
8th, 1+, - plate surface chemical mechanical polishing, 1: Re-polishing 1♀
Figure 1 is a schematic cross-sectional view of the process, and Figure 10 is a schematic lateral view of the process. ) 1ift “f knee J76. ”'I',',, +L':'-small(
Figure 1 is a schematic side view, Figure 12 is a schematic side view, and Figure 13 is a schematic side view explaining the manufacturing process of a general plate.
Figure 4 is a side view schematically showing the gravure printing method, Figure 15
The figure is an enlarged cross-sectional view of a main part for explaining the state of ink scraping failure on the plate surface. 1 - iron core, 2.2' copper plating layer, 3 - cell, 4 chrome plating layer, 5 plate, 6 ink pan, 7 ink
8-doctor, 9 impression cylinder, 10 printing plate J', 11 foreign matter, 12-space, 1.3.1.4-convex portion, 15-plate 16
Pattern area, 17 Non-image area, 18 Micro groove, 20 Abrasive material, 21-Gol, Roll, 25 Abrasive lγ material, 26 Rubber roll, 28 Abrasive material, 29 Rubber 11-Role, 30 Corrosion liquid (
J (supply nozzle, 31 cleaning liquid supply nozzle, 33 electrode, 3
4-Arm, 36 Elastic material, 37 Discharge nozzle, 38
- Electrolyte, 3! 'L-DC power supply.

Claims (3)

[Claims] (1) A method for preventing printing defects in gravure printing, characterized in that minute grooves extending in a direction intersecting the circumferential direction are formed in a non-image area on the surface of a gravure printing plate. (2) The method for preventing printing defects in gravure printing according to claim 1, characterized in that the non-image areas on the surface of the gravure printing plate, excluding the microgrooves, are polished to a surface roughness of 0.08S or less. . (3) The non-image area of the plate surface has minute grooves extending in a direction intersecting the circumferential direction, and the surface roughness of the non-image area excluding the minute groove is 0.08S or less. Features a gravure printing version.