JP3439569B2 - Impression cylinder or intermediate cylinder - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of an impression cylinder or an intermediate cylinder (including a transfer cylinder) in various printing apparatuses, and more particularly to improvement of rollers such as an impression cylinder and an intermediate cylinder in an offset printing machine. It is a thing.

[0002]

2. Description of the Related Art A printing technique is a technique for reproducing a large amount of characters and other graphic information as a hard copy (printed matter) on which a homogenous image is formed on a surface of a printing medium such as paper. In such a printing technique, as is well known, as a printing apparatus used for adhering a coloring material (ink) to a printing plate and press-bonding and transferring it to the surface of a printing object to form a printed matter, Various types of offset printing machines, letterpress printing machines, flexographic printing machines, gravure printing machines, screen printing machines, etc. are available depending on the type of ink transfer from the printing plate to the printing surface (direct printing or indirect printing). is there.

In these printing apparatuses, the difference is whether the printing plate is directly pressed onto the printing medium or an intermediate medium such as a rubber blanket to which the ink adhering to the printing plate is once transferred is pressed onto the printing medium. However, the same holds true for the general idea of transferring the ink on such printing elements (printing plates or intermediates) to the printing substrate, by pressing the printing substrate onto these printing elements and then transferring them. There are many points in common as the structure of the press-bonding / transfer system for printed materials.

FIG. 4 is a diagram showing a schematic structure of a printing mechanism in an offset printing machine. In the offset printing machine, the ink is transferred from the plate cylinder 1 to the blanket cylinder (rubber blanket) 2 and then pressure-transferred onto the surface of the printing medium 4 fed between the blanket cylinder 2 and the impression cylinder 3. , An ink image (printed matter) 5 is formed.

Conventionally, as an impression cylinder of an offset printing machine,
The surface of the metal cylinder is usually finished by chrome plating, but when double-sided printing is performed with a printing machine equipped with an impression cylinder with such a structure, the printed material after the first side printing In the next step, as shown in FIG. 5, 4 is fed between the blanket cylinder 2 and the impression cylinder 3 having the same structure as described above (that is, the first surface of the printing medium on which the ink image 5 is formed is pressed). (Contacting the cylinder 3 side), the ink image 5 printed on the first surface is transferred as a transfer ink image 6 on the surface of the impression cylinder 3 and is subsequently transferred to the same surface of the printing medium 4 sent. As a result of the ink image 6 being transferred again, the printing surface is contaminated (hereinafter,
This is called "back stain". ) Was occurring. If double-sided printing is repeated, this tendency becomes worse, and uneven printing occurs.

Also, in the case of single-sided printing, as shown in FIG.
As shown in FIGS. 6A and 6B, the size of the printing medium 4 to be used ranges from wide to narrow.
When printing on a narrow print target 4 as shown in (a), the blanket cylinder 2 and the impression cylinder 3 are in direct contact with each other in the width portion where the print target 4 does not exist (a strong printing pressure is applied. Therefore, the blanket cylinder 2 is dented by a thickness corresponding to the thickness of the material 4 to be printed.) A slight amount of stain ink on the plate cylinder 1 is transferred to the impression cylinder 3 through the blanket cylinder 2 and stains the impression cylinder. Becomes Next, when the wide printing body 4 passes while the impression cylinder is dirty, there is a problem that the dirt of the impression cylinder adheres to the printing object 4 and stains the printed matter.

Therefore, when the double-sided printing as described above is repeated, or when the narrow printing is changed to the wide printing, the impression cylinder 3 must be washed without fail, and the impression cylinder 3 is also required. For the cleaning of, since the ink adhered to the surface of the impression cylinder 3 is difficult to remove easily, stop the printing machine, reach for a narrow area in a very unstable posture, and add an organic solvent. In addition, a very wasteful and difficult manual work of wiping the impression cylinder 3 while manually rotating it one by one using a waste cloth was forced.

In order to solve such a problem, Japanese Patent Application Laid-Open No. 62-94392 proposes an impression cylinder in which the surface of a metal cylinder is coated with a specific silicone resin.

However, when the surface of the metal cylinder is simply coated with the silicone resin as described above, the resulting silicone resin film has a low hardness, so that the performance is significantly deteriorated due to scratches and abrasions, and the impression cylinder of the offset printing machine is affected. It has been found that it is not practical to use it as a part that is difficult to replace. In addition, when such a silicone-based resin film is formed directly on the surface of the metal cylinder, the surface texture becomes extremely smooth and flat. However, if it has such a surface shape, the material to be printed has such a surface shape. It was found that since the silicone-based resin completely comes into close contact with No. 4, the transfer of the ink from the substrate to be printed 4 is considerably large even though the silicone-based resin exhibits non-adhesive surface physical properties with low surface energy.

The present invention therefore seeks to provide an improved impression cylinder or intermediate cylinder for use in various printing devices. It is another object of the present invention to provide an impression cylinder or an intermediate cylinder which has a small amount of ink contamination and is easy to wash and has high durability. It is another object of the present invention to provide an impression cylinder and an intermediate cylinder for an offset printing machine that are less likely to cause problems such as backside smearing during double-sided printing and printed matter smearing due to a change in the width of an object to be printed during single-sided printing. is there.

[0011]

In order to achieve the above-mentioned objects, the impression cylinder or intermediate cylinder of the present invention comprises a porous ceramic sprayed layer and a porous ceramic sprayed layer on the surface of a degreased and blasted metal roller base material. A composite coating film composed of a low surface energy resin layer formed on the surface of the ceramic sprayed layer and in the pores is formed, and the surface texture has a surface roughness R _{max of} 20 to 40 μm and smooth unevenness. Is to have.

The surface properties of the impression cylinder or the intermediate cylinder are typically desired to have a surface roughness R _max of 20 to 40 μm and have smooth irregularities. Further, it is preferable that the convex portions of the irregularities are present in a uniformly dispersed manner at a ratio of about 1 per 20 μm × 20 μm square to 100 μm × 100 μm square.

Further, it is preferable that a metal sprayed layer is formed between the metal roller base material and the composite coating film in order to bond the composite coating film more firmly.

Further, the low surface energy resin is preferably a silicone resin.

[0015]

As described above, the impression cylinder or the intermediate cylinder according to the present invention is
On the surface of the degreased and blasted metal roller base material,
A composite coating film comprising a porous ceramic sprayed layer and a low surface energy resin layer formed on the surface of the ceramic sprayed layer and in the pores is formed. FIG. 1 is a diagram schematically showing a cross-sectional structure in one embodiment of the impression cylinder or the intermediate cylinder according to the present invention, FIG.
FIG. 3 is a diagram schematically showing a sectional structure of an impression cylinder or an intermediate cylinder according to the present invention in an enlarged manner, and FIG. 3 is a schematic diagram showing a sectional structure in a manufacturing process of the impression cylinder or the intermediate cylinder according to the present invention. It is a figure. Note that the vertical and horizontal scale ratios are exaggerated in these figures.

In order to obtain the impression cylinder or the intermediate cylinder of the present invention, first, as shown in FIG. 3, a ceramic sprayed layer 1 is formed on the surface of a metal roller base material 10 which has been roughened by degreasing and blasting.
Form 2. In the example shown in this figure, the metal sprayed layer 11 is formed on the surface of the metal roller base material 10,
A ceramic sprayed layer 12 is further formed thereon. Ceramic sprayed layer 12 thus formed
As shown in the figure, the surface is a rough surface formed by combining short-period irregularities (pitch-wave irregularities) that form very sharp protrusions and even longer-period irregularities (waviness irregularities). It is preferable that the ceramic sprayed layer 12 has a rough surface of R _{max of} about 30 to 50 μm, and the ceramic sprayed layer 12 is porous.
Preferably, it has fine pores of 0.1 μm to several tens of μm with a porosity of 5 to 20%.

When the ceramic sprayed layer 12 is impregnated and coated with a low surface energy resin such as a silicone resin from the upper portion of the ceramic sprayed layer 12 and dried and solidified, as shown in FIG.
2 and 2, the low surface energy resin layer 13 is formed on the surface of the ceramic sprayed layer and in the holes. As described above, the low surface energy resin 13 has the pitch-wavy irregularities in the ceramic sprayed layer 12 and is porous, so that the ceramic sprayed layer 12 is anchored by entering into these portions.
Adhesion with and good composite coating, ceramic sprayed layer 1
2 and the low surface energy resin layer 13 form a composite coating film 1
Make up 4.

Further, the low surface energy resin 13 covers substantially the entire surface of the ceramic sprayed layer 12, but it is thickly attached to the wavy concave portion and thinly attached to the wavy convex portion. Therefore, the ceramic sprayed layer 12
Although the surface texture is smoother than the state in which only the surface is formed, the unevenness due to the ceramic sprayed layer 12 is not completely buried, and the waviness-like unevenness is generally maintained, and rough surface having smooth unevenness is obtained. A surface can be formed. It is desirable that the final surface roughness R _max is typically about 20 to 40 μm. In addition, the convex portion in the final smooth unevenness (the convex portion of the undulation) is
For example, 20 μm × 20 μm square to 100 μm × 100 μ
m square, especially 30 μm × 30 μm square to 60 μm × 60
It is desirable that the particles are uniformly dispersed at a rate of about 1 per μm square. The convex portion referred to here is measured by two-dimensionally scanning the surface of the object to be measured over a length of 20 mm and a width of 20 mm, and a height of 70% or more of the height of the highest convex portion in this measurement region is measured. It refers to the convex portion that it has.

Therefore, when the impression cylinder or the intermediate cylinder according to the present invention comes into contact with the object to be printed, it does not come into contact with the entire roller surface, but only with the smooth protrusion as described above, and the surface thereof. Since there is a low surface energy resin in the ink, the transfer of the ink from the printing material does not occur easily, and the transferred ink also has a surface with a low surface energy resin and a smooth uneven profile. Combined with this, it can be easily removed by lightly touching it with a dry cloth material or the like.

Further, as described above, the low surface energy resin layer 13 is composited with the ceramic sprayed layer 12 and applied to the surface thereof, so that even if it is used for an extremely long period of time, it is entirely worn and peeled off. It does not occur, and wear only occurs in a very small portion such as the convex portion of the wavy unevenness. Therefore, the low surface energy of the roll surface is maintained for a long period of time, and the deterioration of the characteristics is unlikely to occur. Note that this waviness-like unevenness is expressed as “waviness” for the purpose of comparison with finer pitch unevenness, but it is visually unnoticeable, and therefore the resin layer 13 on the surface of the convex portion is not recognized. However, even if the ceramic sprayed layer 12 is exposed due to abrasion and ink adhesion or reverse transfer occurs at this portion, there is no problem in print quality.

Hereinafter, the present invention will be described in more detail based on the embodiments. As the metal roller base material in the impression cylinder or the intermediate cylinder of the present invention, a material such as a pipe made of cast iron, stainless steel, an aluminum alloy, a roll from a cylinder, or the like is appropriately selected according to the application. For example, if the roller is the impression cylinder of an offset printing machine, then FCD
Cylinders such as (ductile cast iron) are preferred, but of course not limited to these.

Such a metal roller base material must first be cut or polished to have a predetermined diameter accuracy. That is, the impression cylinder or the intermediate cylinder according to the present invention cannot perform such cutting and polishing as a final finish.

Then, in order to improve the adhesion to the ceramic sprayed layer formed on the upper portion thereof, the surface of the metal roller base material is subjected to degreasing / blasting treatment by a known method to roughen the surface.

Next, if necessary, a metal or metal alloy such as Al, Ni or Cr, preferably a thermal sprayed layer such as Ni-Cr, is plasma-sprayed, arc-sprayed, gas-sprayed, etc. on the metal roller base material. It is formed by the method of. This metal sprayed layer is for further enhancing the adhesion between the surface of the metal roller base material and the ceramics sprayed layer, and is particularly suitable for a roller to which a high load is applied during use, such as an impression cylinder. It is highly desirable to form such a metal sprayed layer, but it can be omitted in the case of a roller such as a guide roller which is relatively lightly loaded in consideration of economical efficiency. The thickness of the metal sprayed layer may be about 30 to 70 μm in average film thickness. If it is less than 30 μm, the effect of improving the adhesiveness due to the formation of the metal sprayed layer may not be obtained, while if it exceeds 70 μm, no further effect can be expected and it is economically disadvantageous.

Next, a ceramic sprayed layer is formed on the surface of the metal roller base material or the surface of the metal sprayed layer by using a known ceramics spraying method such as a plasma jet spraying method. The ceramic _{material, Al 2 O 3, TiO 2} , Al 2 O 3 -TiO 2, C
_{r 2 O 3, ZrO 2,} WC, WC-Co, Cr 3 C 2,
Examples thereof include, but are not limited to, TiC and the like or a mixture thereof, and a composite film in which ceramics and a metal are simultaneously sprayed to have conductivity, cermets and the like. The ceramic material is selected such that the adhesion strength with the metal roller base material or the sprayed metal, abrasion resistance, and the ceramic sprayed layer obtained have fine pores (continuous pores) of several μm to several tens of μm and a porosity of 5 to 5. It may be carried out in consideration of economical efficiency, such as having a surface roughness of 20% and a surface roughness of R _{max of} about 30 to 50 μm. In general, white alumina _(W-Al 2 _{O 3)} and gray alumina _{(G-Al 2 O 3)} (Al 2 O 3 -Ti
O ₂ ) and chromia (Cr ₂ O ₃ ) are preferable.

It is desired that the ceramics sprayed layer has fine pores (continuous pores) of several μm to several tens of μm with a porosity of 5 to 20%. This is because the layers can be stably formed into a composite structure, and if the porosity is less than 5%, the surface-active resin may not sufficiently enter the inside of the ceramic sprayed layer and the releasability may be increased, while the porosity is 20% or less. This is because if the content is more than 100%, the strength of the ceramic sprayed layer forming the skeleton structure of the composite coating may be reduced. Further, it is desired that the surface roughness has a R _{max of} about 30 to 50 μm when the low surface energy resin as described below is deposited on the surface of the ceramic sprayed layer. This is because it is a range in which stable adhesion is achieved and finally, smooth irregularities having a necessary and sufficient size are easily formed.

Further, the thickness of the ceramic sprayed layer is 30 to 200 μm in average film thickness, more preferably 4
It is desired to be about 0 to 80 μm. That is, if the average film thickness is less than 30 μm, it may not be possible to obtain a sprayed layer that is uniform and has sufficient properties such as adhesion, strength and abrasion resistance, while the average film thickness exceeds 200 μm. This is disadvantageous in terms of cost. Furthermore,
In a mode where high diameter accuracy is required as in the case where the roll is an impression cylinder, the film thickness is preferably 150 μm or less. That is, in the case of an impression cylinder, it is necessary to suppress the final finish diameter to D ± 0.02 mm or less and the cylindricity of 0.020 mm or less.

The surface roughness of the ceramic sprayed layer is
As described above, it is generally desired that R _max is about 30 to 50 μm, but the optimum surface roughness required as the final product differs depending on the type of roller.

After the ceramic sprayed layer is formed in this manner, a low surface energy resin is impregnated and coated on the ceramic sprayed layer by a method such as spraying, dipping, brush coating or roller coating, and dried and solidified at a predetermined temperature. Then, a low surface energy resin layer is formed on the surface of the ceramic sprayed layer and in the holes. The low surface energy resin is not particularly limited as long as it has low wettability with respect to the ink used and can form a stable film, preferably a high hardness film, against a chemical agent used in the ink composition or the like. However, usually, a silicone resin and a fluorine atom-containing resin are desirable, and a silicone resin is desirable in terms of hardness, workability, chemical stability and the like.

The silicone-based resin is a skeleton mainly composed of a Si-O-Si bond and an organic group, preferably a methyl group and / or a phenyl group, and more preferably a methyl group by polymerizing and three-dimensionalizing after application. Any material having a structure and capable of forming a stable cured film may be used. As the number of methyl groups as side chains increases, the wettability to ink becomes lower, but from the aspect of improving the hardness, it is possible to increase the content ratio of the crosslinked structure derived from a functional group such as a phenyl group or a vinyl group. desired.

The form at the time of construction is not particularly limited. For example, a liquid form of an oligomer, a monomer or the like, or a solution form obtained by dissolving a resin form in an appropriate solvent, such as a silicone varnish. , Commercially available various known compositions classified into silicone rubber, etc. can be appropriately selected and used. For example, a composition commercially available as a varnish type silicone release agent or a composition similar thereto Many of the compositions are preferable in terms of workability and the resulting coating properties. As the silicone release agent, for example, one having a silicone polymer or copolymer having a structure represented by the general formula (I) as a main component is commercially available.

[0032]

[Chemical 1]

(In the formula, each R independently represents a hydroxyl group, alkyl, aryl, alkenyl, halogen-substituted alkyl, halogen-substituted aryl, halogen-substituted alkenyl, preferably methyl group, and n is 1 to 30000.) However, of course, the silicone resin composition used is not limited to such a silicone release agent.

If desired, a filler such as silica fine particles may be added to such a silicone resin composition in order to increase the hardness of the coating. The particle size must be such that it can sufficiently penetrate into the parts and recesses.

As the fluorine atom-containing resin, polychlorotrifluoroethylene, polyvinylidene fluoride,
Using a thermoplastic fluorine atom-containing resin such as polyvinyl fluoride, suspend or swell in a suitable solvent and apply,
Although it is possible to use a dispersion processing method in which a film is formed by heating it above the melting temperature, in order to form a film more reliably on the surface of the ceramic sprayed layer and in the pores, a small amount of it may be present in the molecular chain. A thermosetting fluorine atom-containing resin having a functional group such as a hydroxyl group and a carboxylic acid group, which can be applied in a liquid state and can be crosslinked and cured at room temperature or by heating, is preferable. For example, fluoroethylene, acrylic acid, and methacrylic resin. Examples thereof include copolymers with acids.

As described above, the thickness of the low surface energy resin layer formed on the surface of the ceramic sprayed layer is large in the wavy corrugated concave portion of the ceramic sprayed layer, and thinly adheres to the wavy corrugated convex portion of the ceramic sprayed layer. It is difficult to define the average film thickness. However, it is desirable to adhere the ceramic sprayed layer in a thickness of about 0.5 to 20 μm throughout so that the surface of the sprayed layer is substantially entirely covered and the waviness of the ceramic sprayed layer is maintained.

The thus-obtained impression cylinder or intermediate cylinder of the present invention has a final surface having unevenness, and typically has a surface roughness R _max of 20.
Approximately 40 μm is desirable, and the smooth convex and concave projections on the final surface are, for example, 20 μm × 2.
0 μm square to 100 μm × 100 μm About 1 per square, more preferably 30 μm × 30 μm square to 60 μm
It is desirable that the particles are uniformly dispersed at a rate of about 1 per 60 μm square. And the entire surface is formed by a dense low surface energy resin layer held in the ceramic sprayed layer as a composite coating film,
It has low wettability to the ink used.

Therefore, the roller of the present invention can be suitably used as various rollers arranged in a pressure-bonding / transferring system of a printing material in various printing machines. Specifically, for example, an impression cylinder in an offset printing machine, or It can be suitably used as an intermediate body.

[0039]

EXAMPLES The present invention will be described in more detail below with reference to examples.

Reference Example 1 The surface of a metal cylinder made of ductile cast iron was ground to a final finished diameter of −0.200 mm, and the diameter accuracy (cylindricity of 0.
01) was taken out, and then the surface was roughened by degreasing and blasting. The surface roughness R _{max at} this time was about 35 μm.

Then, Ni- with a powder particle size of 10 to 55 μm was used.
A Cr-alloy is used to form a Ni-Cr sprayed layer having a film thickness of about 30 μm on the surface of the cylinder by plasma spraying, and then G-Al ₂ O ₃ having a powder particle size of 10 to 44 μm is used and plasma sprayed in the same manner. As a result, a ceramic sprayed layer having a film thickness of about 70 μm was formed. Surface roughness R of this ceramic sprayed layer
_{The max} was about 40 μm, and the surface was a wavy rough surface having very sharp protrusions as shown in FIG. The ceramic sprayed layer had pores with a size of 0.1 to several tens of μm, and the porosity was about 16%. The impression cylinder thus obtained was subjected to the following printing test.

Example 1 After the same procedure as in Reference Example 1 above was performed, 100 parts of a silicone resin release agent (KS776L manufactured by Shin-Etsu Chemical Co., Ltd.) and 300 parts of toluene were placed on the ceramic sprayed layer.
Parts and curing catalyst (CAT-P manufactured by Shin-Etsu Chemical Co., Ltd.)
A solution obtained by mixing and stirring 1 part of L8) was impregnated and applied by a spray method, and then dried and solidified in a drying oven at 150 ° C. for 1 hour to form a silicone resin film on the surface of the ceramic sprayed layer. This silicone-based resin coating completely blocks the communicating pores of the ceramic sprayed layer, and on the surface of the sprayed layer, it is thickly attached to the concave and convex portions of the wavy corrugation, and covers the entire surface completely. The film thickness was in the range of 2 to 20 μm, although it varied depending on each part. The surface roughness R _max after forming the silicone resin film was about 30 μm, which was a rough surface having smooth unevenness as shown in FIG. The impression cylinder thus obtained was subjected to the following printing test as in Reference Example 1 and further subjected to the following scratch resistance test.

Printing Test 1 The impression cylinders prepared in Reference Example 1 and Example 1 were
Installed on an offset printing machine (Korizen Corporation's two-sided machine made by Komori Corporation), red ink (Toyo Ink Co., Ltd.),
Double-sided printing was performed on 30,000 sheets of coated paper using HiPlus. For comparison and comparison, the same printing test was also conducted by using an impression cylinder which was polished after usual chrome plating. As a result, when the impression cylinder of Reference Example 1 was used, the surface of the impression cylinder had a rugged uneven shape,
Compared to a normal chrome-plated impression cylinder, the ink stain on the surface of the impression cylinder is less, but as the number of threaded sheets increases, the stain becomes more and more severe. It was revealed that the back stains on the printed matter became noticeable and could not be used in practice. In addition, the sharp protrusions on the surface of the ceramic sprayed layer can be used to remove the ink from the solid areas of the printed matter, creating innumerable microscopic voids (white voids) of several μm, and the clearness of the print can be clearly seen with the naked eye. It was inferior.

On the other hand, in the case of the impression cylinder of Example 1, even after printing 30,000 sheets, only a very small amount of ink adhered to the fine projections on the surface of the impression cylinder. The amount of the adhered ink did not change even if the number of paper sheets was increased, and the ink adherence did not grow. In addition, ink is hardly transferred to the protrusions on the surface of the impression cylinder even at the part that comes into contact with the solid part of the printed matter, and there is very little and little dropout, which does not cause any problems in the print quality of the printed matter. A good printed matter could be obtained.

After the printing test was completed, an attempt was made to remove the ink adhering to the surface of the impression cylinder. In Example 1, it was possible to completely remove the slightly adhering ink by simply wiping it gently with a dry cloth. However, in the case of a chromium-plated impression cylinder for comparison, it is difficult to remove it by such treatment,
It cannot be removed without washing with white kerosene, and in the case of the impression cylinder of Reference Example 1, even if such an organic solvent is used, the ink that has entered the fine recesses on the surface cannot be completely removed. In addition, it was difficult to clean the ink because the ink dissolved in the solvent and having fluidity penetrated into the pores.

Scratch resistance test The surface hardness of the impression cylinder obtained in Example 1 was 4H when examined by a pencil hardness test, and even if the iron tool (driver) was strongly pressed and rubbed, There was a metallic scratch mark on the, but when I wiped it with my fingertip, this mark disappeared neatly. That is, the surface of the impression cylinder of Example 1 was not scratched, but the tool was scraped off and the slag adhered to the impression cylinder. This means that only fine protrusions on the impression cylinder surface of the tool come into contact with the tool, and these protrusions have an extremely thin silicone-based resin film deposited on the ceramic sprayed layer with high wear resistance. It is considered that this is because the hardness of the sprayed layer substantially has a strong effect. Although the silicone-based resin film directly contacts the tool on this protrusion, it only contacts as a very fine point and does not contact as a surface. The silicone resin film is only worn and removed only on the protrusions, and the silicone resin film is not peeled off as a surface.

On the other hand, for comparison, the silicone resin used in Example 1 or JP-A-62-9439.
The surface hardness of a test body obtained by directly coating the surface of a cast iron cylinder having a smooth surface property before blasting with some of the silicone-based resins disclosed in No. 2 was examined by a pencil hardness test. It was 2H, and it was easily scratched by simply rubbing it lightly with a hard tool such as a tool.

Example 2 A low surface energy resin coating was applied to 100 parts of a silicone resin release agent (KNS316 manufactured by Shin-Etsu Chemical Co., Ltd.).
100 parts of toluene and curing catalyst (Shin-Etsu Chemical Co., Ltd.)
CAT-PL56) manufactured by CAT-PL56) was manufactured in the same manner as in Example 1 except that a solution obtained by mixing and stirring 3 parts was used.
When a printing test and a scratch resistance test were conducted in the same manner as described above, excellent results were obtained as in Example 1.

Examples 3 to 6 KR2046 (Example 3), X-40-2141 (Example 4), X-41-9710H (Example 5), or a low surface energy resin coating as a silicone resin, or An impression cylinder was prepared in the same manner as in Example 1 except that X-40-201 (Example 6) (both manufactured by Shin-Etsu Chemical Co., Ltd.) was used, and a printing test was conducted in the same manner as above. It was
Although there was a slight difference in the degree of dirt on the impression cylinder surface after the printing test, in all cases, good print quality was maintained as in Example 1, and the impression cylinder after printing was completed. The dirt on the surface could be completely removed by dry method.

[0050]

As described above, the impression cylinder or the intermediate cylinder of the present invention has fine surface properties and relatively smooth irregularities, and has a ceramic sprayed layer and a surface excellent in abrasion resistance. The base material surface is covered with a composite film composed of a low surface energy resin layer such as a silicone resin having low energy, and the surface texture thereof has a surface roughness R _max 20.
Since it has a smooth unevenness of about 40 μm, it is difficult for ink to adhere to the surface. Therefore, it can be suitably used as various rollers arranged in the press-bonding / transfer system of the printing object in various printing machines, for example, as an impression cylinder or an intermediate cylinder in an offset printing machine, and it can be continuously used in a large amount or for a long time. When performing the printing operation, it is possible to provide a printed matter of good printing quality without stains, and it is also excellent in durability. Furthermore, since the ink adhering to the surface can be easily removed by a dry method, the cleaning operation of the roller, which has been extremely dangerous and hard work in the past, can be extremely easy, and a very simple structure can be achieved. By incorporating the cleaning device into the device, it is possible to automatically clean the device, which is very effective in reducing the time and labor required for cleaning and the initial cost.

[Brief description of drawings]

FIG. 1 is a diagram schematically showing a cross-sectional structure in one embodiment of an impression cylinder or an intermediate cylinder according to the present invention,

FIG. 2 is an enlarged schematic view showing a sectional structure of an impression cylinder or an intermediate cylinder according to the present invention,

FIG. 3 is a diagram schematically showing a sectional structure in a manufacturing process of an impression cylinder or an intermediate cylinder according to the present invention,

FIG. 4 is a diagram showing a schematic configuration of a printing mechanism in an offset printing machine,

FIG. 5 is a schematic diagram illustrating ink stains on an impression cylinder during double-sided printing in offset printing,

6A and 6B are diagrams showing a relationship between an impression cylinder and a blanket cylinder and an object to be printed in an offset printing machine, FIG. 6A is a state in which a narrow object to be printed is printed, and FIG. 6B is a wide object to be printed. Diagram showing the state printed on the body,

[Explanation of symbols]

1 ... plate cylinder, 2 ... blanket cylinder, 3 ... impression cylinder, 4 ... substrate to be printed, 5 ...
Ink image, 6 ... Transfer ink image, 10 ... Metal roller base material, 11 ... Metal sprayed layer, 12 ... Ceramic sprayed layer, 1
3 ... Low surface energy resin layer, 14 ... Composite coating film.

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI B65H 5/06 B65H 5/06 A F16C 13/00 F16C 13/00 A // B29K 83:00 B29K 83:00 105: 04 105 : 04 (56) Reference JP-A-4-217491 (JP, A) JP-A-3-120048 (JP, A) JP-A-6-127732 (JP, A) JP-A-3-256950 (JP, A) ) Actual Development Sho 61-31740 (JP, U) Japanese Patent Publication 7-106747 (JP, B2) Japanese Official Publication 56-2018 (JP, B1) Japanese Official Publication 5-12203 (JP, Y2) (58) Field (Int.Cl. ⁷ , DB name) B65H 27/00 B29D 31/00 B41F 13/08 B41F 35/06 B65H 5/06 F16C 13/00 B29K 83:00 B29K 105: 04

Claims (4)

(57) [Claims] 1. A printing apparatus, which is an impression cylinder or an intermediate cylinder arranged in a pressure-bonding / transferring system for pressure-bonding an object to be printed with respect to a printing element and then transferring the same, which has been degreased and blasted. On a metal roller base material, a composite coating film composed of a porous ceramic sprayed layer and a low surface energy resin layer formed on the surface of the ceramic sprayed layer and in the pores is formed, and the surface thereof. An impression cylinder or an intermediate cylinder characterized by having a surface roughness R _{max of} 20 to 40 μm and having smooth unevenness. 2. The convex portion of the unevenness is 20 μm × 20 μm
The impression cylinder or the intermediate cylinder according to claim 1, wherein the pressure cylinder or the intermediate cylinder is present at a ratio of about 1 per square to 100 µm x 100 µm square. 3. The impression cylinder or the intermediate cylinder according to claim 1, wherein a metal sprayed layer is formed between the metal roller base material and the composite coating film. 4. The impression cylinder or the intermediate cylinder according to claim 1, wherein the low surface energy resin is a silicone resin.