JP5123965B2 - Impression cylinder and transfer cylinder jacket for offset sheet-fed printing press - Google Patents

Description

  The present invention relates to an impression cylinder / passing cylinder jacket in a printing machine, particularly an offset sheet-fed printing machine.

  As a prior art related to a jacket mounted on an impression cylinder / transfer cylinder (the “transfer cylinder” described in this specification includes an intermediate cylinder that does not apply printing pressure to pass paper between the impression cylinders) It has been reported in detail in Document 1, and by the invention of the impression cylinder jacket, an offset sheet-fed double-sided printing machine has been practically completed and adopted by printing machine manufacturers all over the world.

  However, even if this impression cylinder jacket is used, compared to the printing quality of a single-sided printing press, the ink on the printed surface of the preprinted ink is removed at the convex part of the ceramic uneven surface of the impression cylinder jacket, resulting in fine scratches. Scratches and white spots (which can be clearly identified by observing with a 50 × magnifier) occur, resulting in a difference in print quality between the front and back surfaces, and it is required to be as close as possible to the quality of single-sided printing.

  The scratches and white spots are uniquely managed by the roughness Rmax of the jacket surface, and the scratches and white spots tend to increase as Rmax increases. Rmax: 40 μm is defined as the upper limit as a limit that can hardly be visually confirmed.

  As a measurement standard of roughness, there is JIS0601-1982, but Patent Document 1 does not clearly indicate the measurement length. However, the roughness of the ceramic sprayed coating varies greatly with changes in measurement length, both Rmax and Rz, and the amount of change slightly affects the performance of the impression cylinder jacket. Table 1 shows the relationship between Rmax and Rz due to the difference in the roughness measurement length during the roughness measurement according to JIS0601-1982.

  In particular, scratches cause a problem in print quality even if the number is about 1 to 3 per unit area (2 × 2 mm), but even if this is managed by roughness measurement inspection (Rmax), the measurement length is 4 mm, Alternatively, abnormal protrusions (upper limit value: exceeding Rmax 40 μm) detected based on the JIS standard of 12.5 mm are very low in terms of probability, which may be a serious problem in printing trouble.

  When these ceramics or metal powders are coated by a thermal spraying process, these abnormal projections have a variation in the particle size distribution of the sprayed material. The main cause is that the height of the mountain is not constant.

On the other hand, in claim 3 of Patent Document 1 of the prior art, “--the uneven portions of the ceramic are present at a rate of about 1 per 20 μm × 20 μm square to 100 μm × 100 μm square”. However, the greater the number of convex portions per unit area, the greater the number of white spots that occur when the ink on the solid pattern portion of the preprinted surface of double-sided printing is taken by the convex portion of the impression cylinder jacket. There was a problem. It was very difficult to arbitrarily control the pitch of the peaks of the convex portions by a thermal spraying process (control the entire jacket surface of about 1 × 1 m ² with a uniform mountain pitch and to an arbitrary distance and height). .

  Also, in the case of ceramic spray jacket, if you want to reduce the diameter of the convex part, you will use a spray material with a small particle size, but if you reduce the diameter, the height of the mountain will decrease proportionally, and the small convex part It is difficult to form unevenness of a high mountain with a diameter of.

  In addition, in the case of a ceramic spray jacket, the arrangement of the peaks of the convex portions is random and preferable, but the pitch of the peaks is an arbitrary size of about 0.1 to 0.5 mm and is uniform at any position on the wide jacket surface. It is extremely difficult to form with a pitch.

  Also, the outermost surface is coated with a low surface energy silicone resin, but the silicone resin is overwhelmingly less wear resistant than ceramics, so the silicone resin on the ceramic protrusions will wear out in a short period of time. To do. In order to prevent this, it has been devised to prevent the silicone resin from wearing in the concave part by making the concave and convex structure of the ceramic and the composite film of the silicone resin so that the paper surface and the convex part of the ceramic are in contact with each other. Has achieved an amazing printing life of 20 million sheets.

  However, the thickness of the coating film of the silicone resin of the jacket is merely an expression that the convex part is thin and the concave part is thick, and there is no particular detailed standard for the method of measuring the silicone resin film thickness. In addition, the coating thickness does not change even if it is thickly coated, so even if it is measured with a 1/1000 mm scale micrometer, it is very easy to manage the appropriate thickness. It is difficult.

  However, there has been a problem that the performance and life of the impression cylinder jacket greatly change depending on the amount of the silicone resin coating (the amount adhering to the uneven surface). Further, conventionally known non-adhesive resins to be coated on the surface of the impression cylinder jacket include low surface energy resins, silicone resins, and the like, and there are cases where numerical values are limited particularly by an index of surface energy.

  However, there are many types of silicone resins, and the optimum resin is selected for each application. However, the silicone resin that can be effectively applied to the impression cylinder jacket is very limited, and even if the impression cylinder jacket is manufactured with the knowledge that has been publicly known, many silicone resins can produce an effective jacket with many ink stains. There was no problem.

JP-A-8-12151

  Accordingly, an object of the present invention is to reduce scratch scratches and white spots on printed matter in a printing machine, particularly an offset sheet-fed double-sided printing machine, and print twice on one side of the print quality difference between the front and back sides (print the surface, print the back side after drying) And a manufacturing method of the impression cylinder / passing cylinder jacket for manufacturing a jacket having a lower manufacturing cost and preventing the shortening of the jacket life due to a paper edge trouble.

As a result of earnest research for solving the above problems, the present inventors have
An average diameter of convex portions of 10 to 50 μm, an average depth of etching of 30 to 60 μm, and an average pitch of convex portions of 0.1 to 0. 0 are formed on a surface portion of a metal substrate having a thickness of 0.2 to 0.5 mm by etching. A metal layer formed with a 5 mm uneven structure;
A silicone resin layer coated following the concavo-convex structure of the surface portion of the metal layer;
And the silicone resin layer has an average depth of unevenness after curing of 15 to 50 μm, and achieves the above object by a cylinder jacket for an offset sheet-fed printing press and a manufacturing method thereof. It was.

  In the present invention, a metal substrate is very sharp by etching (average diameter of protrusions is 10 to 50 μm), the height of the peaks is constant, and the average depth of the valleys (etching depth) is 30 to 30 mm. A concavo-convex structure having a thickness of 60 μm and an average pitch of 0.1 to 0.5 mm is formed, and a silicone resin is coated thereon so that the convex portions are thin and the concave portions are thick, and the concavo-convex structure is imitated. By providing a surface profile with an average depth of unevenness of 15 to 50 μm after curing, print defects such as scratches on the printed matter, white spots, ink trapping defects, etc. are minimized, and stable quality with less jacket contamination is provided. can do.

  In addition, the silicone resin has a gum tape peeling force of 20 g or less, and the coating film thickness is controlled by the unevenness depth after the resin coating, so that there is very little dirt on the jacket (the jacket is not frequently washed), and In addition, it is possible to suppress the printing trouble (paper edge trouble) caused by the jacket damage due to the paper edge, and to stably extend the jacket life.

It is a diagram schematically showing a cross-sectional structure in an embodiment of the impression cylinder and transfer drum jacket according to the present invention, It is a diagram schematically showing an impression cylinder / passing cylinder jacket according to the present invention, It is a diagram schematically showing an impression cylinder / passing cylinder jacket according to the present invention, It is a diagram of a grid arrangement regarding the dot arrangement of the protrusions after etching according to the present invention, It is a diagram of a random arrangement regarding the dot arrangement of the protrusions after etching according to the present invention, It is a diagram showing a state in which the umbrella-like burrs of the projecting portion (needle projection) after etching of the present invention remains, It is a diagram showing a state after the umbrella-shaped deburring of the protrusion (needle protrusion) after etching of the present invention, It is a diagram schematically showing a cross-sectional structure in an embodiment of a ceramic sprayed impression cylinder jacket, Roughness chart after etching in the production process of the impression cylinder jacket according to the present invention (Example 1 (pitch of convex portion; 0.14 mm)) ((roughness measurement condition) JIS B0601-1982 Vertical magnification: 500 times (20 μm / 10 mm) flatness rate: 20 times (500 μm / 10 mm)), Roughness chart after etching in the manufacturing process of the impression cylinder jacket according to the present invention (Example 2 (pitch pitch: 0.3 mm)) ((roughness measurement condition) JIS B0601-1982 longitudinal magnification: 500 times (20 μm / 10 mm) flatness rate: 20 times (500 μm / 10 mm)), It is a roughness chart (comparative example) of the ceramic sprayed impression cylinder jacket (roughness measurement conditions are the same as in FIG. 5). It is a figure of the enlarged photograph by a microscope for demonstrating the scratches of a printed matter, and the printing failure of white-out.

(Body jacket for offset sheet-fed printing press)
The first of the cylinder jacket for an offset sheet-fed printing press according to the present invention has an average diameter of protrusions of 10 to 50 μm and an etching average on the surface of a metal substrate having a thickness of 0.2 to 0.5 mm by an etching method. A metal layer on which a concavo-convex structure having a depth of 30 to 60 μm and a pitch of convex portions of 0.1 to 0.5 mm is formed, and a silicone resin layer coated following the concavo-convex structure on the surface portion, The silicone resin layer has an uneven depth of 15 to 50 μm after curing.

  When the cylinder jacket for an offset sheet-fed printing press according to the present invention is used as an impression cylinder jacket for an offset sheet-fed printing press, an average diameter of convex portions of 10 to 30 μm is etched on the surface portion of the metal substrate by an etching method. It is preferable that the uneven structure having an average depth of 30 to 40 μm and a pitch of the protrusions of 0.1 to 0.3 mm is randomly arranged, and the silicone resin layer coated according to the uneven structure on the surface portion The depth of the unevenness after curing of the silicone resin layer is preferably 15 to 35 μm.

  On the other hand, when the cylinder jacket for an offset sheet-fed printing press according to the present invention is used as a transfer cylinder jacket for an offset sheet-fed printing press, it has the same manufacturing method and concavo-convex structure as the impression cylinder jacket. Having an uneven structure with an average diameter of 10 to 50 μm, an average etching depth of 30 to 60 μm, an average pitch of protrusions of 0.1 to 0.5 mm (random arrangement is not necessarily a requirement), and a silicone resin It is preferable that the average depth of the unevenness after curing is 20 to 50 μm.

  FIG. 1 is a diagram schematically showing a cross-sectional structure of an impression cylinder jacket and a transfer cylinder in an embodiment of an impression cylinder jacket and a transfer cylinder according to the present invention, in which the vertical and horizontal scale ratios are exaggerated. . Hereinafter, the structure of the impression cylinder jacket and the transfer cylinder will be described with reference to FIG.

  In the present invention, after forming the metal layer 1 having a concavo-convex structure by forming a large number of convex portions on a metal substrate, the concavo-convex structure of the surface portion is formed so as to follow the concavo-convex structure, that is, the concave portions are not buried. Are coated with the silicone resin layer 4 (the silicone resin layer is coated so that the concavo-convex structure of the metal layer remains substantially, that is, substantially remains).

  More specifically, “following the concavo-convex structure” is a broad concept including the case where the convex portions of the silicone resin layer forming the outermost surface correspond to the convex portions of the metal layer formed by the etching method. . In other words, the case of “following the concavo-convex structure” is a case where the concave portion of one silicone resin layer is located between the convex portions of the most adjacent metal layer. Specifically, it means that the convex part of the surface of the silicone resin layer matches the convex part of the metal layer, and the concave part of the surface of the silicone resin layer matches the concave part of the metal layer.

  Therefore, in the case of “following the concavo-convex structure”, not only when the silicone resin layer is formed with a uniform thickness on the surface of the metal layer, but also as shown in FIG. This includes the case where the silicone resin layer is formed thicker on the surface of the recess than the surface. In particular, the uneven structure of the entire metal layer formed by the etching method is reflected in the surface shape of the silicone resin layer, and the paper contact surface defined by the tip position of the convex portion of the silicone resin layer that forms the outermost surface is It is desirable that the silicone resin layer be coated so as to be constant.

  1B and 1C show an impression cylinder / transfer drum jacket according to the present invention, in which “the average diameter of the protrusions”, “the average depth of etching”, “the average pitch of the protrusions”, “the average depth of the unevenness”, and It is the figure shown in order to clarify terms, such as "the distance which connects the edge of an uppermost surface between the convex parts of the adjacent metal layer or silicone resin layer." The “average pitch of the convex portions” refers to the lengths 11 and 12 as shown in FIGS. 1B and 1C. That is, when the jacket is viewed from the top (the shape of the upper surface of the convex portion), in the case of a circle, the middle point is determined at each of the nearest convex portions with the center as the middle point. It is an arithmetic mean obtained by measuring 10 lengths connecting points with straight lines, in other words, lengths 11 and 12 connecting the midpoint and midpoint of the circle between the nearest neighbors. In the case of an irregular shape, an arbitrary straight line having the longest two intersections is drawn on the closed region, and the middle point of the straight line connecting the intersections is set as the middle point. It is an average value obtained by measuring a plurality of lengths 11 and 12 obtained by obtaining the midpoint at each of the most adjacent convex portions and connecting the midpoints with straight lines.

  The “average diameter of the convex portion” means the length of 19, 20, 21 as shown in FIGS. 1B and 1C. When the shape of the upper surface of the convex portion is a circle, it means the diameter 21, 22 and the convex portion When the shape of the upper surface of the cross section is irregular, it means an arithmetic average obtained by drawing an arbitrary straight line having the longest two intersections on a closed region and measuring the length of ten line segments connecting the intersections.

  “Average depth of unevenness” means an arithmetic average obtained by measuring 10 distances 13 between the uppermost surface and the lowermost surface of the silicone resin layer between the convex portions of the silicone resin layer adjacent to each other. “Etching average depth (also simply referred to as etching depth)” is an arithmetic average obtained by measuring 10 distances 14 between the uppermost surface and the lowermost surface of the metal layer between the convex portions of the adjacent metal layers. Say.

  In addition, when there is no description in this specification, “the average diameter of the convex portions”, “the average depth of etching” and “the average pitch of the convex portions” are “the average diameter of the convex portions after coating with the silicone resin”, It does not mean "average etching depth after coating with silicone resin" and "average pitch of projections after coating with silicone resin", but "mean diameter of projections on metal layer after etching", "metal after etching" The average etching depth of the layer ”and“ the average pitch of the protrusions of the metal layer after etching ”means“ the average depth of the projections and depressions ”. It means “average depth of unevenness”.

  The cylinder jacket for an offset sheet-fed printing press according to the present specification is a covering (jacket) that covers a cylinder other than the plate cylinder and the blanket cylinder among the cylinders used in the offset sheet-fed printing press. In particular, it is preferably used as a covering for an impression cylinder and a transfer cylinder.

  The numerical values of the average diameter of the protrusions, the etching average depth, the optimum pitch of the protrusions, and the reasons for the differences between the impression cylinder jacket (i) and the transfer cylinder jacket (ii) are as follows.

"Impressor jacket"
(I) The impression cylinder jacket is printed by pressing paper between the blanket cylinder and the impression cylinder. If the diameter of the convex portion of the impression cylinder jacket is large, the undried ink of the solid pattern portion on the preprinted surface is Large white spots occur in proportion to the size. The smaller white spots are more preferable, but the limit that can be visually identified is 30 μm or more in diameter. On the other hand, if the average diameter of the convex portion is too small (less than 5 μm), the convex portion is quickly worn and the jacket life is shortened due to a strong printing pressure with the paper and a minute slip. Therefore, the average diameter of the convex portions is 10 to 30 μm, and preferably the average diameter of the convex portions is 15 to 25 μm. However, those having a convex portion diameter of 5 μm or less and 40 μm or more are excluded, and a group of convex portions having a diameter of 10 to 30 μm is preferable.

  In order to prevent the impression cylinder jacket from being soiled for a long period of time, it is preferable that the average depth of the unevenness of the jacket is at least 20 μm. Further, in order to maintain the wear resistance of the silicone resin coated on the outermost surface, the etching depth is preferably 30 μm or more and 40 μm or less so that a thick silicone resin can be coated on the recess.

  If a surface roughness Rz of 30 μm or more is to be achieved by conventional ceramic spraying, the diameter of the convex portion is as large as about 30 to 80 μm and is generated at a ratio of more than about 30%. However, the etching method of the present invention has an advantage that the diameter of the convex portion can be processed to 30 μm or less and the depth can be processed to 30 μm or more.

  When the etching average depth exceeds 50 μm, the convex portion tends to be weak in strength. Further, when the depth is deeper than 40 μm, it becomes easy to generate a mountain having a convex portion having a diameter of less than 10 μm, or a mountain flying away, and the cost is increased. Therefore, in the impression cylinder jacket according to the present invention, the depth of the metal layer after etching, that is, the etching average depth is 20 to 50 μm on average, and preferably 30 to 40 μm on average.

  Next, regarding the pitch of the peaks of the protrusions, the impression cylinder jacket is subject to a high printing pressure between the preprinted surface and the impression cylinder jacket, so the smaller the pitch of the peaks, the more (the number of peaks). White spots occur. Therefore, the number of white spots decreases as the pitch increases. However, when the points that receive the paper surface are sparse (when the pitch is increased), the jacket convex part has a strong printing pressure on the post-printing surface, and the ink trapping from the blanket cylinder to the paper is good, but the concave part has a printing pressure. The problem of low ink trapping on the post-printed surface occurs.

  The maximum pitch of the projections that does not affect ink trapping is 0.3 mm or less, although it varies depending on the paper thickness. On the other hand, the minimum pitch of the convex portions is 0.1 mm or more in order to reduce the white spot occurrence rate. Therefore, the average pitch of the convex portions of the impression cylinder jacket is preferably 0.1 to 0.3 mm, more preferably 0.12 to 0.25 mm, and most preferably 0.14 to 0.2 mm. .

  As described above, the pitch of the peaks of the convex portions can be arbitrarily selected. However, if the convex portions are arranged in a regular grid as shown in FIG. ) Is in contact with the printed surface paper, and printing defects such that white spots appear as moire when ink is taken out at the convex portions are likely to occur. In order to prevent this, it is preferable to arrange the protrusions in a random arrangement as shown in FIG. 2B.

  The number of protrusions per unit area of 1 mm × 1 mm is 100 at a 0.1 mm pitch, 50 at a 0.14 mm pitch, 25 at a 0.2 mm pitch, and 11 at a 0.3 mm pitch. And the white area ratio with respect to the entire printed area greatly change.

  In the production method of the present invention, the pitch can be selected to an arbitrary size within the above pitch range (average 0.1 to 0.3 mm) in accordance with the required specification of print quality. Furthermore, after forming a concavo-convex structure by etching, a silicone resin is coated to form an impression cylinder jacket with an average concavo-convex depth of 15 to 35 μm after the resin is cured, thereby preventing ink stains and scratches on the printed matter. Therefore, it is possible to provide an impression cylinder jacket with a very small whiteness, a small number, and a very long jacket durability.

"Passing trunk"
(Ii) Generally, the transfer drum jacket is a jacket attached to the transfer drum for transferring the paper printed on the impression drum portion to the next impression drum. Since the transfer cylinder does not apply printing pressure and the paper only touches the transfer cylinder lightly, the ink on the surface of the paper is taken out by the convex parts due to the unevenness of the jacket, which causes white spots in the solid pattern part. Hateful. Therefore, there is no problem even if the diameter of the convex portion is slightly larger than the impression cylinder jacket. Further, since printing is not performed in the transfer cylinder portion, the problem of ink trapping failure from the blanket cylinder to the paper does not occur even if the pitch of the convex portion is slightly larger than that of the impression cylinder jacket. An important factor for the surface roughness profile of the transfer drum jacket is to increase the height of the unevenness to minimize the ink stain from the paper to the jacket, (the larger the unevenness height, the less the ink stain on the jacket, and , The silicone resin in the recess is less worn and the life of the jacket is longer), and the height of the protrusion is constant (the paper is easy to slide on the jacket in the transfer cylinder, so the level of the peak is constant) Otherwise, scratches are likely to occur in the solid pattern portion of the printed material).

For this reason, the roughness profile of the transfer drum jacket is preferably such that the average diameter of the protrusions is 10 to 50 μm, more preferably 20 to 40 μm. The average etching depth is 30 to 60 μm, and the average pitch of the protrusions is preferably 0.1 to 0.5 mm, more preferably 0.2 to 0.4 mm. After the resin is cured by coating with a silicone resin The average depth of the irregularities is preferably 20 to 50 μm, more preferably 30 to 40 μm.
(Manufacturing method of trunk jacket for offset sheet-fed printing press)
A second method of manufacturing a cylinder jacket for an offset sheet-fed printing press according to the present invention includes a step (a) of forming a photoresist layer on the surface of a metal substrate, and a plurality of the metal substrates by etching. A step (b) of forming a surface portion so as to leave a convex portion, a step (c) of removing umbrella-shaped burrs from the etched convex portion (needle protrusion), and a primer following the concave-convex structure of the surface portion And a step (d) of forming a silicone resin layer by coating with a silicone resin, and the average depth of the irregularities after the coating is 15 to 50 μm.

  When the manufacturing method of the cylinder jacket for an offset sheet-fed printing press according to the present invention is applied to the manufacturing method of the impression cylinder jacket for an offset sheet-fed printing press, the average depth of the unevenness after coating is 15 to 35 μm. When applied to a transfer drum jacket, the average depth of the irregularities is preferably 20 to 50 μm. For the above reasons, in the case of an impression cylinder jacket, the average depth of the unevenness after coating is more preferably 20 to 30 μm, and in the case of a transfer drum jacket, the average depth of the unevenness after coating. Is more preferably 30 to 40 μm.

  In the impression cylinder jacket according to the present invention, the metal substrate has a thickness of 0.2 to 0.5 mm, and the step (b) is performed by etching the metal substrate so that the average diameter of the protrusions is 10 to 10 mm. A manufacturing method is preferable in which the surface is formed on a surface of a concavo-convex structure having a random arrangement of 30 μm, an average etching depth of 30 to 40 μm, and an average pitch of protrusions of 0.1 to 0.3 mm. For the above reasons, the average diameter of the protrusions is more preferably 15 to 25 μm, and the average pitch of the protrusions is more preferably 0.12 to 0.25 mm.

  In the transfer drum jacket according to the present invention, the metal substrate is a metal substrate having a thickness of 0.2 to 0.5 mm, and the step (b) includes forming a convex portion by etching the metal substrate. A production method in which the average diameter is 10 to 50 μm, the average etching depth is 30 to 60 μm, and the average pitch of the convex portions is 0.1 to 0.5 mm is preferable. For the above reasons, the average diameter of the protrusions is more preferably 20 to 40 μm, and the average pitch of the protrusions is more preferably 0.2 to 0.4 mm.

  Referring to FIGS. 2A and 2B, a so-called photo-etching method is a method in which a photoresist layer is formed on the surface of a metal substrate and etched to form a large number of uneven structures on the surface. One embodiment (stages (a) and (b)) will be described. 2A and 2B show an example of dot arrangement of the metal layer after etching, and the dot diameter, dot average diameter, and pitch numbers in FIG. 2A and B are merely examples. Therefore, the scope of the present invention is not limited to this.

  FIG. 2A is a pattern having a grid pattern and a dot arrangement (dot arrangement) inclined at 45 degrees, and a metal layer on which a concavo-convex structure having a convex part diameter of 10 to 30 μm and a convex part pitch of 0.14 mm is formed. It is fabricated by photoetching method. In the case of an impression cylinder jacket, about 10 to 100 dots (projections) per unit area (1 mm × 1 mm), and in the case of a transfer cylinder jacket, about 4 to 100 dots per unit area (1 mm × 1 mm). A metal layer having dots (convex portions) can achieve the object of the present invention regardless of the point arrangement. In particular, in the case of an impression cylinder jacket, a random dot (convex) arrangement (FIG. 2B) is more preferable from the viewpoint of preventing moiré of printed matter.

  In this case, the dots are exposed and developed on a metal substrate on which a photoresist layer is formed, using a film having a pattern having the dot arrangement (the diameter of the dots is adjusted to be thick depending on the etching depth) or a glass original plate. After printing, the areas other than the dots after development are corroded by the etching method, so that the diameter of the protrusions, the etching depth, and the pitch between the protrusions can be adjusted arbitrarily and accurately. Can be formed. In particular, the height of the peak of the convex portion is constant, and the paper surface comes into contact with the surface of the convex portion having the same height, so that the ceramic spray jacket (hereinafter referred to as a ceramic spray jacket) described in Patent Document 1 is used. As a result, the scratches are hardly generated on the printed matter.

  In the case of ceramic spray jackets, if you want to reduce the diameter of the convex part, you will use a spray material with a small particle size, but if you reduce the diameter, the height of the peak will be proportionally reduced, It is difficult to form unevenness of a high mountain with a diameter.

  In addition, in the case of a ceramic spray jacket, the arrangement of the peaks of the convex portions is random and preferable, but the pitch of the peaks is an arbitrary size of about 0.1 to 0.5 mm and is uniform at any position on the wide jacket surface. It is extremely difficult to form with a pitch.

  However, in the method of forming a photoresist layer on the surface of the metal substrate of the present invention, exposing the dots, developing, and baking, and corroding areas other than the dots by the etching method after development, the principle of photolithography is used. The dot size and pitch can be arbitrarily selected, and the etching depth can be freely controlled. And since the level before the etching of the metal substrate is the peak of the peak of the convex part, the heights of the peaks are all the same level, and the height of the entire unevenness can be controlled in the depth direction of the concave part.

  When very fine irregularities as in the present invention are formed by the etching method using the photoresist layer, the shape of the convex portions (needle projections) can be an umbrella-shaped burr as shown in FIG. This is a phenomenon that occurs when the etching rate is delayed in the adhesion portion of the resist layer of the convex needle projection. When these slight burrs are used as impression cylinders, they appear as donut-shaped white spots on the printed matter, and the ink adhered to the burrs is reversely transferred to the printed matter, resulting in donut-shaped stains and printing failure. Occur. Therefore, it is preferable to further deburr after etching.

  That is, after the steps (a) and (b), the step (c) of removing the umbrella-shaped burrs of the protrusions (needle protrusions) after the etching is performed.

  The method for removing the burrs includes ultrasonic deburring, electrolytic polishing deburring, chemical treatment (dipping into strong acid), and the like. As a method for selectively removing very fine burrs, Nepros is a kind of chemical treatment. Processing (brand name). The nepros treatment is performed by uniformly pouring a metal substrate having a concavo-convex structure on the surface in the step (b) into an acidic liquid, which is a chemical polishing solution, and melting the surface of the metal substrate. In the present invention, it is preferable to remove burrs by nepros treatment.

  In addition, the conditions of the nepros treatment according to the present invention are appropriately selected and are not particularly limited. For example, a chemical polishing liquid (nepros liquid) used for the nepros treatment and a solvent such as water are mixed at a predetermined ratio. It is preferable to heat the solution to 40 to 60 ° C., immerse the substrate having the concavo-convex structure after the etching treatment for 30 to 50 minutes, and further wash with water, neutralize and wash with water.

  After the step (c) of removing the umbrella-like burrs on the protrusions (needle protrusions) after the etching, a primer resin and a silicone resin are coated to form a silicone resin layer following the uneven structure of the surface part. When the silicone resin is directly coated on the concavo-convex structure of the metal substrate following the concavo-convex structure after etching, the adhesion between the metal material (stainless steel) and the silicone resin is low. Therefore, even in the case of a composite film structure that receives the paper surface with a needle projection having a concavo-convex structure, the wear resistance of the silicone resin is low, and the silicone resin in the concave portion of the jacket also falls off in a short period of time, resulting in a short life. In order to increase the adhesion between the stainless steel and the silicone resin, it is preferable to perform primer treatment before the silicone resin coating in order to extend the life.

  In addition, when the silicone resin is coated directly without primer treatment, if the jacket cleaning material (manufactured by Niken Chemical Co., Ltd .; Blanc Wash) is applied to the cloth and rubbed strongly, the silicone film will peel off and fall off relatively easily. After being applied to a metal substrate having a concavo-convex structure, it is dried and solidified, and then coated with a silicone resin. After drying and curing, the silicone resin is strongly rubbed by applying a jacket cleaning material (manufactured by Nikken Chemical Co., Ltd .; Blanc Wash) to the cloth. However, it was confirmed that the silicone film did not peel off. That is, for example, as a primer treating agent, primer No. 4 was diluted with toluene, brushed or sprayed and then dried and solidified, coated with a silicone resin, and dried and cured at 130 ° C. for 30 minutes. The silicone resin was a jacket cleaning material (manufactured by Nikken Chemical; The silicone film was not peeled off even when the fabric was washed and rubbed strongly.

  However, when the primer treatment agent is applied with a brush, the primer coating unevenness or fluff residue remains, and the performance as an impression cylinder jacket cannot be satisfied. In addition, in the case of spray painting, the leveling property of the silicone resin coated on the primer is poor, and the surface after drying the silicone resin coating becomes a madara pattern (unevenness). There was a problem that the luster of the material became a madara pattern.

  Other primer treatments include itro treatment (Itro treatment laboratory), and for example, the method described in JP-A-2007-51186 can be applied to the present invention.

The said itro process is a process in which a silane compound is mixed in a fuel gas for forming a flame, and the surface of the solid substrate is treated using the flame. By this treatment, a large number of nano-level particles mainly composed of SiO ₂ are formed on the surface of the treated substrate. Since this nano-level film is firmly bonded to the base material (stainless steel) and has a strong binding force to the silicone resin, the adhesive strength between the base material (stainless steel) and the silicone resin is very strong.

  The conditions for the itro treatment according to the present invention are appropriately selected and are not particularly limited. For example, as the conditions for the itro treatment, a treatment apparatus manufactured by Itro (burner length: 150 mm, burner movement: Linear), propane gas flow rate: 3-4 L / min, air flow rate: 80-110 L / min, itrogas flow rate: 0.5-1.6 L / min, distance: 20-40 mm, processing speed (burner moving speed) ): Tested by touching various conditions at 250 to 700 mm / sec, and it was confirmed that the adhesive strength of the silicone resin was greatly improved under any ittro treatment conditions.

  Tables 2 and 3 show comparative test results of the difference in adhesion force between the presence and absence of itro treatment.

As the primer treatment, itro treatment is more preferable.

  After the metal substrate having the concavo-convex structure on the surface as described above is primed, and then the surface is coated with silicone resin, spray coating, roller coating, brushing method, spin coating, high speed after dipping For example, a spray coating method is used. Moreover, after coating a silicone resin, it is preferable to dry and solidify at 100-150 degreeC for 10 to 60 minutes.

  As a result, the impression cylinder jacket and the transfer cylinder jacket according to the present invention have the structure and the depth of the unevenness, so that the printing pressure is evenly applied, and printing such as scratches on the printed matter, white spots, defective ink trapping, etc. It is possible to minimize the obstacles and to secure a stable quality with less jacket dirt.

From the above, the impression cylinder jacket and the transfer cylinder jacket according to the present invention and the manufacturing method thereof have the same effect of preventing ink stains, but the influence on the print quality varies greatly depending on the location used. By investigating and analyzing the differences in detail, we have invented a jacket with a new optimum surface profile that does not exist in the prior art. This is a completely new jacket manufacturing technique that is difficult to realize in the rough surface forming process called thermal spraying.
(Each component in the body jacket for an offset sheet-fed printing press and its manufacturing method)
For the metal substrate according to the present invention, a single metal such as stainless steel, aluminum, copper, nickel, or an alloy thereof is selected. That is, since the metal can achieve the object of the present invention as long as it can secure sufficient adhesion when the jacket is mounted on the impression cylinder and the transfer cylinder, the corrosion resistance, abrasion resistance, strength In addition, the cost and the like are determined and appropriately selected.

  As a material of the silicone resin according to the present invention, a silicone resin having a gum tape peeling force of 20 g or less is preferable, for example, KNS-316, KE45TS type manufactured by Shin-Etsu Chemical, etc. are preferable. In the present invention, since the silicone resin is an example of a non-adhesive resin, another non-adhesive resin may be used.

  As shown in FIG. 1, the film thickness of the silicone resin layer in the impression cylinder jacket and the transfer drum jacket according to the present invention is different depending on the recesses and the protrusions because the protrusions are thin and the recesses are thicker than the protrusions. The film thickness of the silicone resin layer is selected as appropriate, but the film thickness at the convex portion is thin and is preferably several microns or less. Specifically, the film thickness at the convex portion of the impression cylinder jacket is 1 to 5 μm. In addition, the film thickness in the recess of the impression cylinder jacket is preferably 5 to 15 μm. Moreover, it is preferable that the film thickness in the convex part of a transfer drum jacket is 1-5 micrometers, and the film thickness in the recessed part of a transfer drum jacket is 5-30 micrometers.

  It is preferable that the thickness of the silicone resin layer according to the present invention is controlled by the depth of the irregularities after the silicone resin coating.

  Further, it is preferable that the average depth of the unevenness after coating the silicone resin according to the present invention is measured by measuring the silicone resin film thickness of the dummy plate without etching, which is simultaneously coated, and managed by the difference between the etching depth and the silicone resin film thickness. .

When the concavo-convex structure surface is coated with a silicone resin, since the convex portion has a very small area, most of the silicone resin flows into the concave portion, and very little remains on the convex portion. Moreover, the film thickness of the silicone resin coated on the recess cannot be measured with an electromagnetic film thickness meter or an eddy current film thickness meter. Therefore, when silicone resin is coated on the shell jacket according to the present invention, a dummy plate that is not etched (same material and same thickness as the product) is simultaneously coated under the same spray conditions, so that the film thickness on the dummy plate Measure with a film thickness meter. Then, the uneven depth after coating is controlled by the difference between the etching depth and the thickness of the silicone resin film on the plane of the dummy plate (the etching depth can be measured with a micro depth gauge: 1/1000 mm. The depth of unevenness after resin coating is because the depth to the top surface of the resin cannot be measured accurately because the dip gauge needle is stuck in the resin. Strictly speaking, the volume corresponding to the volume of the convex part is thicker than the film thickness of the flat part, but the volume of the convex part is 3.5% of the whole (pitch 0.14 mm, diameter of the convex part bottom part). (case of φ30 μm), and hardly affects the film thickness of the recess. (It may be considered that the film thickness coated on the plane and the film thickness of the recesses are substantially equal.)
In addition, the depth after coating of a silicone resin layer is 15 micrometers-35 micrometers in the case of an impression cylinder jacket, and 20 micrometers-50 micrometers in the case of a transfer cylinder jacket.

  In the present invention, an etching method is used as a method for forming a surface portion having a large number of recesses. In general, there are two types of etching methods, the first being dry etching and the second being wet etching.

  The etching used for the impression cylinder jacket, the transfer cylinder jacket and the manufacturing method thereof according to the present invention may be either dry etching or wet etching, but wet etching is preferable. Examples of dry etching methods include gas etching, photoexcited etching, ion-assisted etching, ion milling, chemical dry etching, cylindrical plasma etching, microwave plasma etching, reactive ion beam etching, sputter etching, and laser beam etching. Depending on the case, it is used appropriately. Preferably, the reaction mechanism is chemical etching.

  In the wet etching method, an etching solution generally includes sulfuric acid type, hydrochloric acid type, hydrogen halide type, iodine type, and a mixture thereof. However, the etching solution is appropriately selected depending on a resist material and a metal substrate used, and is publicly known. An etchant can be used. Therefore, the range according to the present invention is not limited by the type of the etchant.

  In the impression cylinder jacket of the present invention, a photoresist layer is formed on the surface of a metal substrate and corroded by an etching method, so that the size, depth, and pitch between the nearest projections are desired. And can be formed accurately. The photoresist in this case may be either a positive type or a negative type, and is preferably a negative type.

The negative resist polymer is not particularly limited, but may be a chemically amplified type containing a resin component whose alkali solubility is changed by the action of an acid and an acid generator component which generates an acid upon exposure. Examples of the chemically amplified resist include those for KrF, ArF, F ₂ , electron beam, and X-ray.

  The negative polymer for forming the photoresist layer is appropriately selected depending on the metal used as the material of the metal substrate to be used, but utilizes a styrene resin, a fluorinated alcohol resin, or a reverse polarity change due to intramolecular dehydration esterification. Examples include ester resins.

  Similarly, the positive polymer forming the photoresist layer includes a novolak resin, a dendrimer type, a polymethacrylic ester resin, a norbornene alicyclic resin, a maleic anhydride-containing resin, a fluorine resin, and the like.

  The acid generator is an iodo compound such as WPAG-145 (manufactured by Wako), WPAG-170, WPAG-199, and triazines such as paramethoxystyryl triazine, diphenyliodonium trifluoromethanesulfonate, (4-methoxyphenyl) phenyliodonium trifluoro. Examples include sulfonate-based acid generators such as lomethanesulfonate, bis (p-tert-butylphenyl) iodonium trifluoromethanesulfonate, triphenylsulfonium trifluoromethanesulfonate, and (4-methoxyphenyl) diphenylsulfonium trifluoromethanesulfonate. The acid generator is appropriately selected.

  The polymer, developer, acid generator, dissolution inhibitor, release agent, etc. that form the photoresist layer are not limited to those described above, and known ones can be used, and the scope of the present invention is not limited to these. It goes without saying that it is not.

  The impression cylinder jacket according to the present invention preferably has a characteristic that the peeling force of the gum tape as a non-adhesive index of the silicone resin coated on the outermost surface is 20 g or less.

  Even if it is limited to the low surface energy resin (silicone resin) of the type that is dry-cured, there are countless resins. Conventionally disclosed low surface energy resins include those having a very low surface tension with water, but the lower the surface tension, the lower the ink adhesion to the impression cylinder jacket. Not exclusively. From the results of various experiments conducted by the present inventor and the surface energy index (surface tension; calculated from the contact angle measurement with water), the inventor's invented peeling force of the gum tape is more suitable for evaluating the ink adhesion of the impression cylinder jacket. Excellent as a method.

  The gum tape peeling force as a non-adhesive index described here is a quantitative evaluation method originally conceived by the present inventors, and a 25 mm wide Nitto Denko cloth adhesive tape (product number: N0.750) is dried. It is affixed to the surface of a cured non-adhesive resin, measures the force to peel off the tape in a perpendicular direction, and measures the non-adhesiveness by the magnitude of the force.

In addition, as a result of conducting a long-term test in the printing operation of the actual machine, if the peeling force of the gum tape is less than the ink adhesion effect of the impression cylinder jacket, the peeling of the gum tape is based on the ink characteristics of the sheet-fed printing press If the force is 30 g or more, jacket stains occur in printing thousands of sheets, and it is necessary to perform jacket cleaning in the middle of printing, but if it is 20 g or less, it can be reduced to a cleaning frequency of 10,000 to tens of thousands of sheets. Was confirmed.
By using this index as a selection index for the non-adhesive resin, it is possible to more accurately determine the anti-stain effect of the impression cylinder jacket.

  The silicone tape for the transfer drum jacket has a higher peeling force than that of the impression cylinder jacket. However, the lower the better, the better for the impression cylinder jacket. It is preferable to use the same silicone resin.

  It is not necessary to be limited to the type or product number of the gum tape used for the gum tape peeling force according to the present invention. However, the size of the peeling force of the adhesive tape changes when the used adhesive tape is changed. However, the use of the adhesive tape with the same peeling force (adhesive force) by using the tilting ball tack device in JIS Z0237-12 standard is also possible. Even if the type of the gum tape is changed, it is within the scope of the technical idea of the present invention.

  Examples will be described below, but the present invention is not limited to the following examples.

Example 1
A stainless steel plate (SUS 304 2B) having a thickness of 0.37 mm was degreased and coated with a photoresist (dry film) by (lamination method).
On the other hand, a film original plate having a dot diameter of 100 μm, a dot pitch of 0.14 mm, and a dot array of 45 ° and a 45 ° inclination was prepared by photolithography.

  A film original plate in which dots were photoengraved was placed on a SUS plate coated with a photoresist, exposed, developed (sprayed), and baked (cured) so that the resist remained only on the dot portion on the SUS plate.

  The SUS plate was sprayed with an etching solution and etched to a depth of 40 μm, and then the stripping solution was sprayed to remove the resist on the projections and spray washed. The convex part diameter at this time was an average of 20 μm (max 30 to min 4 μm), a pitch; an average of 0.14 mm, an unevenness depth; an average of 40 μm (max 43 to min 37 μm).

After the etching treatment, nepros treatment (a kind of deburring by chemical treatment) was performed, and umbrella-shaped deburring of the convex portion (needle protrusion) was performed. Those wherein Nepurosu process, Nepurosu treatment liquid (basic liquid (Nepurosu liquid): water = 1: 3) in the bath was heated to 50 ± 3 ° C., a SUS plate with a concavo-convex structure after the etching process It was immersed for 35 to 40 minutes, further washed with water, neutralized and washed with water.
By deburring, the dot diameter was reduced by 4 μm on average and the depth was reduced by 2 μm on average. For comparison, a jacket without deburring was also prepared. The pattern of the dot arrangement of the protrusions after etching is shown in FIGS. 2A and 2B.

  After etching, as a primer treatment before silicone resin coating, itro treatment was performed, and then 100 parts by mass of silicone resin (manufactured by Shin-Etsu Chemical Co., Ltd .; KNS316), 100 parts by mass of toluene and a curing catalyst (Shin-Etsu Chemical ( Co., Ltd. CAT-P56) A solution mixed and stirred at 3 parts by mass was coated by a spray method, and then dried and cured in a drying furnace at 130 ° C. for 30 minutes, and the unevenness depth of the surface after drying and curing: a pressure of 25 μm A torso jacket was produced.

  In addition, the conditions of the said itro process use the processing apparatus (Burner length: 150 mm, burner movement: linear) made by Itro Co., propane gas flow rate: 3 L / min, air flow rate: 80 L / min, itrogas flow rate: 0.00. The measurement was performed at 5 L / min, distance: 20 to 40 mm, and processing speed: 250 mm / sec.

  In the present invention, a digital micro dip gauge (Digimatic indicator; ID-C112BC, measurement range: 12.7-0.001 mm) manufactured by Mitutoyo was used as the etching (average) depth. In addition, the method for measuring the depth of the unevenness is that when the silicone resin is coated on the deburred plate, the dummy plate without etching is also coated on the same spray condition at the same time, and the silicone resin film thickness on the dummy plate is made by KEYENCE. Measured with an overcurrent displacement sensor (high-precision digital displacement sensor; EX-110V, measurement range: 0 to 2 mm, resolution: 0.4 μm), and the difference between the etching depth and the silicone resin film thickness on the plane of the dummy plate Was calculated as the uneven depth after coating.

(Example 2)
Except that the pitch at the time of photoengraving was 0.3 mm, an uneven profile was formed by etching and a silicone resin coating was performed by the same method as in Example 1 to prepare an impression cylinder jacket.

  At this time, the diameter of the protrusions after etching was 24 μm (max 32 to 20 μm) on average, pitch; 0.3 mm on average, uneven depth; 38 μm on average (max 40 to 37 μm), and the uneven depth after coating with silicone resin was; It was 23 μm.

(Example 3)
Except that the pitch at the time of photoengraving was 0.5 mm, formation of an uneven profile by etching and silicone resin coating were performed in the same manner as in Example 1 to prepare an impression cylinder jacket.

  The convex part diameter after etching at this time is an average of 25 μm (max 33 to min 20 μm), a pitch; an average of 0.5 mm, an uneven depth; an average of 41 μm (max 42 to min 39 μm), and the uneven depth after the silicone resin coating is 28 μm.

(Comparative example)
After degreasing and blasting a 0.3 mm thick SUS plate, Ni-Cr having a particle size range of 10-38 μm was sprayed as a metal spraying material with a thickness of 30 μm, and G-Al2O3 with a thickness of 10-44 μm was sprayed as a ceramic spraying material. Thermal spraying of 40 μm gave a product thickness of 0.37 mm. The surface roughness at that time was Rz; 32 μm. Furthermore, a ceramic sprayed impression cylinder jacket having a surface roughness Rz; 28 μm after coating the same silicone resin as in Example 1 in the same manner was prepared. However, the primer treatment before the silicone resin coating was not performed.
In this roughness measurement method, the measurement length at the time of roughness measurement according to JIS0601-1982 is 4.0 mm.

Example 4
The impression cylinder jackets produced in Example 1, Example 2, Example 3 and Comparative Example were mounted on the impression cylinder of an offset sheet-fed duplex printing machine JP4P440 manufactured by AIC (Akiyama International Co., Ltd.) and coated paper A double-sided printing test was conducted.

The jacket of the comparative example is a product with a long-term track record over the past 10 years, and the existing jacket is the most excellent in terms of print quality and life.
On the other hand, in Example 1 of the present invention, the ink stain on the jacket was further reduced, scratch scratches that were problematic in the comparative example were greatly reduced, and those with large white spots (30 μm or more can be identified visually). ) Was halved, and the blank area ratio was slightly reduced as compared with the comparative example. Ink trapping on the post-printed surface was completely satisfactory.

  In addition, ink stains due to wear of silicone resin, which is the most critical factor in the jacket life, are also compared with the comparative example, although the diameter of the convex portion is reduced (the ceramic spray jacket of the comparative example is 10 to 80 μm). On the other hand, the etching jacket of the present invention is 5 to 30 μm) and the depth of the irregularities is as deep as 40 μm (38 μm after deburring), so that the silicone resin wear resistance of the recesses is greatly improved and ceramic spraying is performed. The life was extended by 1.5 times the life of the jacket (approx. 20 million sheets).

  Further, in Example 1, when the grid of the grid pattern (FIG. 2A) having a regular arrangement of convex portions is compared with the grid pattern of a random array (FIG. 2B), the cross grid pattern is whitened due to ink removal of the convex portions. Moire phenomenon due to the fact that the line becomes linear was easy to occur. (The white spots on a point-by-point basis are very fine and cannot be seen at all, but they become conspicuous when they are gathered in a line.) Therefore, in the case of the etching jacket for the impression cylinder, it was confirmed that it is more preferable to arrange the protrusions in a random arrangement.

  Further, in Example 1, without deburring after etching, and in other cases, in the actual machine printing test using the jacket under the same conditions as in Example 1, the ink was removed by the umbrella-shaped burrs of the convex portions (needle protrusions). In addition, an ink-like white spot occurs, and the ink taken out of the burr is reversely transferred onto the paper surface, resulting in a donut-shaped stain. Therefore, it has been confirmed that deburring is more preferable after etching.

  In Example 2, the number of white spots and the area ratio of the printed material were further reduced to 1/5, and the print quality was improved.

  Ink trapping on the post-printed surface tends to be slightly worse due to the large pitch of the convex portions, but was sufficient to cover the whole by adjusting the overall printing pressure (slightly increasing the printing pressure). As compared with Example 1, the wear of the silicone resin makes the paper surface and the concave portion resin more easily contacted by the larger pitch of the convex portion, and the life is shortened, but there is no difference in the life from the comparative example. Example 3 is better than the comparative example, but the pitch of the protrusions is too large compared to Examples 1 and 2, and in the case of thin paper, the protrusions stick into the paper, and the ink on the post-printed surface Trapping is also inferior, and it is not good for overall evaluation. From the above, it was found that the average pitch of the convex portions is preferably 0.1 to 0.3 mm.

(Example 5)
As an evaluation scale of non-adhesive resin used for an impression cylinder for an offset printing press, the present inventor has devised a method for measuring the peel strength of a gum tape.

  As an example of a non-adhesive resin on a flat plate, a silicone resin is applied and dried and cured on the surface of the sample; manufactured by Nitto Denko Corporation; 750, a tape width of 25 mm × length of 70 mm is affixed to a length of 50 mm, and the entire surface is pressed uniformly with a constant force (1000 g).

In this specification, one end of the gum tape is attached only to the spring, and the maximum value until the gum tape is completely peeled off at a constant speed in the vertical direction is defined as the gum tape peeling force.
Silicone resins having various peeling strengths measured by this method were coated on the surface after forming the concavo-convex structure by etching in Example 1 to produce an impression cylinder jacket. These impression cylinder jackets were mounted on an offset sheet-fed double-sided printing machine to perform printing operations.

  As a result of double-sided printing of 4 colors on the front side and 4 colors on the coated paper, the impression tape jacket with a peel-off force of 30 g or more varies depending on the type of ink and paper, but it can be printed on 2000 to 5000 sheets. Ink adheres to and accumulates on the entire surface of the upper pattern, and printing failure (warping of the printed matter, doubles) occurs, so printing cannot be continued as it is (impression jacket cleaning is required during printing). On the other hand, it was found that the number of printable sheets without jacket cleaning exceeded 10,000 sheets at 20 g or less, and exceeded 30,000 sheets at 10 g or less.

  From the above, it is normal that the number of printed sheets of general offset sheet-fed printing per lot is 5000 to 10000 or more, and cleaning capable of printing 10,000 or more sheets with a minimum of one jacket cleaning. If the frequency is not limited, it cannot be practically used as an impression cylinder jacket (decrease in work efficiency, increase in scrap paper). Therefore, it has been found that it is desirable to use a non-adhesive resin such as a silicone resin having a gum tape peeling force of 20 g or less, preferably 10 g or less in a dry-cured state.

(Example 6)
A stainless steel plate (SUS 304 2B) having a thickness of 0.30 mm was degreased and coated with a photoresist (dry film) by (lamination method). On the other hand, a film original plate having a dot diameter of 140 μm, a pitch of 0.5 mm, and a dot arrangement of 45 degrees with a grid pattern was prepared by photolithography. A film original plate in which dots were photoengraved was placed on a SUS plate coated with a photoresist, exposed, developed (sprayed), and baked (cured) so that the resist remained only on the dot portion on the SUS plate.

  The SUS plate was sprayed with an etching solution and etched to a depth of 50 μm, and then the resist on the dots (convex portions) was removed by spraying a stripping solution, followed by spray cleaning. The convex part diameter at this time was an average of 40 μ (max 43 to min 35 μm), a pitch: 0.5 mm, a depth; an average of 50 μm (max 53 to min 45 μm). After the etching treatment, the same Nepros treatment (a kind of deburring by chemical treatment) as in Example 1 was performed, and the convex portion (needle projection) was deburred in an umbrella shape. By deburring, the dot diameter was reduced by an average of 4 μm and the depth was reduced by an average of 2 μm. A jacket without deburring was also made for comparison.

  After etching, as a primer treatment before silicone resin coating, the same intro process as in Example 1 was performed, and then 100 parts of silicone resin (manufactured by Shin-Etsu Chemical Co., Ltd .; KNS316) and toluene 100 were formed on the etching plate. After coating a solution obtained by mixing and stirring 3 parts of the catalyst and 3 parts of a curing catalyst (CAT-P56 manufactured by Shin-Etsu Chemical Co., Ltd.) with a spray method, the coating was dried and cured in a drying furnace at 130 ° C. for 30 minutes, and the surface roughness after dry curing was A transfer drum jacket having an uneven depth of 40 μm was manufactured.

  This transfer cylinder jacket was mounted on the transfer cylinder of the offset sheet-fed duplex printing machine SM102 manufactured by Heidelberg, and a double-sided printing test on coated paper was performed. In the case of the impression cylinder jacket of Example 3, when the pitch of the convex portion is increased to 0.5 mm, in the case of thin paper, a phenomenon occurs in which the paper sticks into the convex portion, and the problem of poor ink trapping on the rear printing surface also occurs. However, overall good results were not obtained, but in the transfer drum jacket of Example 6, since no printing pressure is applied, even if the convex part diameter is increased and the pitch of the peaks is increased to 0.5 mm, There were no printing problems such as scratches caused by the protrusions sticking into the paper and ink trapping defects on the post-printed surface, and there was very little ink smearing on the jacket, and the jacket cleaning frequency could be greatly reduced. Furthermore, compared with the case where Example 1 is used as a transfer drum jacket, the wear resistance of the silicone resin is further improved by increasing the diameter of the convex portion and deepening the depth, thereby greatly contributing to the extension of the life. I understood.

  Also, in the comparison of the presence or absence of deburring after etching, the impression cylinder jacket has less influence on the print quality due to burrs. preferable. Further, compared with the ceramic spray transfer cylinder jacket according to claims 8 to 16 and 17 of JP-A-8-12151 of the prior art, this jacket has an abnormality like a ceramic spray jacket even if the surface roughness is increased. No scratches occur because there are no protrusions. Or, in comparison with the glass bead coating film for transfer drums of claims 16 and 17 of JP-A-8-12151, the jacket is conductive while there is a charging trouble due to the film being an insulator. For this reason, there is no problem at all, and there is no problem such as glass bead dropout due to low adhesive strength between the glass beads and the film (solvent resistance), and the life is several times as long as the glass beads film for transfer drums. .

DESCRIPTION OF SYMBOLS 1 Metal board | substrate 2 Metal-powder sprayed layer 3 Ceramics sprayed layer 4 Silicone resin 11 The pitch of the uneven part in the upper surface of a metal layer 12 The pitch of the uneven part in the upper surface of a silicone resin layer 13 Depth of unevenness 14 Etching depth 15 The nearest neighbor The distance connecting the ends of the uppermost surface between the convex portions of the silicone resin layer 16 The distance connecting the ends of the uppermost surface between the convex portions of the adjacent metal layers 19 The convex portion on the upper surface of the silicone resin layer Diameter 20 convex diameter on the upper surface of the metal layer 21 convex diameter on the upper surface of the metal layer 22 convex diameter on the upper surface of the silicone resin layer

Claims (7)

Thickness of 0.2 to 0, in which a concavo-convex structure having an average diameter of protrusions of 10 to 50 μm, an average etching depth of 30 to 60 μm, and an average pitch of protrusions of 0.1 to 0.5 mm is formed on the surface by an etching method A manufacturing method of a cylinder jacket for an offset sheet-fed printing press having a 5 mm metal substrate and a silicone resin layer coated in accordance with the concavo-convex structure of the surface portion,
Forming a photoresist layer on the surface of the metal substrate (a);
(B) forming a surface portion of the metal substrate so as to leave a large number of convex portions by the etching method;
After performing the step (c) of removing the umbrella-like burrs of the protrusion (needle protrusion) after the etching,
Performing an itro process following the surface portion of the metal substrate having a concavo-convex structure formed thereon, and forming a silicone resin layer by coating a silicone resin following the concavo-convex structure of the surface portion ; Have
Characterized by comprising the average depth 15~50μm of irregularities after the coating method for producing a cylinder jacket offset sheet-fed printing press. And step (a) of forming the photoresist layer on the surface of the metal substrate,
Forming a surface portion of the metal substrate by etching so as to leave a large number of convex portions (
b) and
After performing the step (c) of removing the umbrella-like burrs of the protrusion (needle protrusion) after etching,
Performing an intro process following the surface portion of the metal substrate having a concavo-convex structure formed on the surface , and forming a silicone resin layer following the concavo-convex structure of the surface portion ;
Have
The method for producing a cylinder jacket for an offset sheet-fed printing press according to claim 1, wherein an average depth of the unevenness after coating is 15 to 35 µm.   After sticking the gum tape to the silicone resin and pressing it uniformly over the entire surface with 1000 g, when the maximum value until the gum tape is completely peeled off is taken as the gum tape peeling force, the silicone resin is dried. The method for producing a cylinder jacket for an offset sheet-fed printing press according to any one of claims 1 and 2, wherein the adhesive strength of the adhesive tape after curing is 20 g or less. The manufacturing method of the cylinder jacket for offset sheet-fed printing presses of Claim 1 or 3 is a manufacturing method of the transfer cylinder jacket for offset sheet-fed printing presses in which the average depth of the unevenness | corrugation after the said coating becomes 20-50 micrometers. And
The metal substrate is a metal substrate having a thickness of 0.2 to 0.5 mm, and the step (e) includes:
The metal substrate is formed by etching on a surface portion having an average diameter of protrusions of 10 to 50 μm, an average etching depth of 30 to 60 μm, and an average pitch of protrusions of 0.1 to 0.5 mm. The manufacturing method of the transfer cylinder jacket for offset sheet-fed printing machines of any one of Claim 1 and 3 . The manufacturing method of the cylinder jacket for offset sheet-fed printing presses in any one of Claim 1 and Claims 3-4 WHEREIN: The delivery for offset sheet-fed printing presses in which the average depth of the unevenness | corrugation after the said coating becomes 20-50 micrometers A method for manufacturing a torso jacket,
After the step (c), the thickness of the silicone resin is measured so that the thickness of the convex portion is 1 to 5 μm and the concave portion is 5 to 30 μm. wherein the managing unevenness depth after coating by the difference of the silicone resin film thickness to is, the transfer cylinder jacket for offset sheet-fed printing machine according to any one of claims 1 and claims 3-4 Production method. The method for producing a cylinder jacket for an offset sheet-fed printing press according to claim 2 or 3 is a method for producing an impression cylinder jacket for an offset sheet-fed printing press,
The metal substrate has a thickness of 0.2 to 0.5 mm, and the step (b) is performed by etching the metal substrate so that the average diameter of the protrusions is 10 to 30 μm and the average etching depth is 30 to 40 μm. The production of an impression cylinder jacket for an offset sheet-fed printing press according to claim 2 or 3 , characterized in that it is formed on the surface portion of a concavo-convex structure of random arrangement with an average pitch of 0.1 to 0.3 mm of convex portions. Method. The method for producing a cylinder jacket for an offset sheet-fed printing press according to any one of claims 2 and 3, and 6 is a method for producing an impression cylinder jacket for an offset sheet-fed printing press,
After the step (c), the thickness of the silicone resin is measured so that the thickness of the convex portion is 1 to 5 μm and the concave portion is 5 to 20 μm. The manufacturing method of an impression cylinder jacket for an offset sheet-fed printing press according to any one of claims 2, 3 and 6 , characterized in that the uneven depth after coating is controlled by the difference between the thickness of the resin and the thickness of the silicone resin. Method.