JPH09175703A - Printed body pressing anc conveying roller - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve a follow-up property at the time of high-speed rotation and at the same time to reduce the sticking contamination of ink by forming a composite cover film comprising a thermally-sprayed layer of porous ceramic and a low-surface-energy resin layer for covering the surface and the inside of a hole on a fiber-reinforced resin-made roll base material. SOLUTION: This pressing and conveying roller which is suitably used as a guide roller for a rotary printing machine has a base layer 11 of 30 to 300μm thick comprising the same kind of organic high polymer materials as a synthetic resin forming the matrix of a fiber-reinforced resin on a fiber-reinforced resin- made roll base material 10 and a backing layer 14 comprising a roughened surface layer 12 having a film thickness of 50 to 300μm and a surface roughness (Rz) of 40 to 130μm. The roughened surface layer 12 is formed of a synthetic resin forming the matrix of a fiber-reinforced resin and a same kind of granulated solid organic material 13, and a composite cover film 17 comprising the thermally-sprayed layer 15 of porous ceramic and a low-surface-energy resin layer 16 is formed on the backing layer 14.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in rollers for pressure-bonding and transfer of printed materials in various printing apparatuses, and more particularly to improvements in rollers such as guide rollers in various rotary printing machines.

[0002]

2. Description of the Related Art Printing technology is used to print characters and other graphic information.
It is a technique of mass-copying a hard copy (printed matter) on which the same quality image is formed on the 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, Offset printing machine, letterpress printing machine, flexo printing machine, depending on the type of ink transfer from the printing plate to the printing surface (direct printing or indirect printing)
There are various types such as a gravure printing machine and a screen printing machine.

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, the printing substrate being pressed onto these printing elements and then transferred. There are many common points in the structure of the body pressure bonding and transfer system.

FIG. 4 is a diagram showing a schematic structure of a printing and transferring mechanism for a printing medium in an offset printing machine. This example is a rotary type in which a continuous paper wound in a roll shape is used as the material to be printed 4, ink is transferred from the plate cylinder 1 to the blanket cylinder 2, and further between the blanket cylinder 2 and the impression cylinder 3. The ink image 5 is formed by pressure contact transfer to the surface of the printing material 4 that has been sent in. The printing material 4 having the ink image 5 formed on the surface is then transferred and changed by a plurality of guide rollers 7. Pass through the device while being directed.

In a rotary press that continuously prints on an object to be printed, such as a paper or film wound in a roll, a guide system for transferring the object to be printed is provided with many guide rollers. The transfer system using such guide rollers is not limited to the above-mentioned offset rotary press (newspaper rotary press, commercial offset rotary press, foam rotary press), but also gravure printing machine, flexo printing machine, letterpress newspaper rotary press. And the like.

As a guide roller 7 for a rotary press, conventionally,
Conventionally, an iron pipe whose surface is plated with chrome, or an aluminum alloy pipe used as a material for weight reduction have been widely used. Furthermore, in order to prevent slippage of the material to be printed and ink adhesion due to the point contact effect, the surface of these guide rollers is knurled, or the surface of which is roughened like sandpaper is affixed to ceramics. Something that has been done is known.

However, the knurled aluminum alloy pipe has a low wear resistance, and the unevenness of the knurl disappears in a short period of time, so that slip is likely to occur. Also, in the case where a sandpaper-like rough surface tape is attached to the roller surface, the sand beads may be dropped off or the tape may be peeled off after a short period of use, and it cannot withstand long-term use. On the other hand, a ceramic spray-coated surface has very high wear resistance and has a very good effect in terms of slip resistance, but the following problems of ink adhesion become remarkable. There were drawbacks.

That is, the surface of any of the conventionally known guide rollers is made of a material having a physical property of relatively high ink adhesion.
Even if the surface is roughened, when the rotary press is operated for a long time, the ink image 5 printed on the surface of the printing medium 4 becomes
The transfer ink image 8 is transferred onto the surface of the guide roller 7 in contact therewith, and the transfer ink image 8 is further followed by the printing medium 4 to be printed.
There is a problem that the printed matter is contaminated by being reversely transferred to the surface. For this reason, when operating the rotary press, such guide rollers must be regularly cleaned, which interrupts the printing work for the cleaning operation, causes a large cleaning load, and neglects cleaning. Therefore, a trouble of producing a defective printed matter will occur.

In particular, in the case where the ceramics has a sprayed surface, the ink cannot be easily removed by wiping the surface because the ink gets into the concave portion of the sprayed rough surface and adheres thereto. When the cleaning is performed by using, the ink dissolved in the solvent is transferred and impregnated into the pores of the ceramic sprayed layer, so that the cleaning operation is difficult.

Recently, as such a guide roller, a fiber reinforced resin such as carbon fiber reinforced resin (CFRP) is used because it has a high rigidity and a light weight, and therefore can cope with high speed printing machines. It has also been proposed to use rolls made from.

Further, the roll made of fiber reinforced resin has poor wear resistance on the surface and may cause fuzz and the like. Therefore, for the purpose of improving it, Cr plating excellent in wear resistance is applied. Has proposed to form a sprayed coating of metal or ceramics which can be performed by a relatively simple process in order to reduce the complexity of the plating process (for example, Japanese Utility Model Publication No. 4-7378, JP-A-60-214958). JP-A-61-96063, JP-A-61-10
No. 4061).

However, even if a roll made of such fiber reinforced resin is used as a base material, the surface of the roll is made of Cr.
Those having a plated layer, a metal sprayed layer, and a ceramic sprayed layer have not yet solved the problems of ink adhesion or contamination of printed matter as described above.

Further, Japanese Patent Laid-Open No. 4-310741
Japanese Patent Laid-Open No. 6-207614 discloses a method for preventing ink stains on such a fiber-reinforced resin roll.
It has been proposed that the surface of a fiber reinforced resin roll is coated with a fluororesin, a silicone resin, or a fluorine / silicon-containing resin.

However, a product obtained by applying only such a resin coating has a remarkably poor abrasion resistance of the surface coating layer and loses its releasing effect in an extremely short period of time due to abrasion contact, so that it is used under abrasion. Application to members such as guide rollers is not practical.

[0015]

SUMMARY OF THE INVENTION Accordingly, the present invention is directed to an improved print press-bonding member for use in various printing devices.
The purpose of the present invention is to provide a transfer roller.
It is another object of the present invention to provide a roller for pressure-bonding / transferring an object to be printed, which is capable of high-speed rotation, has good followability during high-speed rotation, has little ink adhesion and contamination, and is easy to wash and has high durability. It is what

[0016]

In order to achieve the above-mentioned objects, a roller for pressure-bonding / transferring an object to be printed according to the present invention comprises a fiber-reinforced resin roll base material, a porous ceramic sprayed layer and the ceramics. It is formed by forming a composite coating film composed of a low surface energy resin layer formed on the surface of the sprayed layer and in the pores.

In the above-mentioned pressure-bonding / transferring roller for printed material of the present invention, the fiber-reinforced resin is preferably carbon fiber-reinforced resin.

In the roller for pressure-bonding / transferring the printed material according to the present invention, the fiber-reinforced resin roll base material is made of the same organic polymer material as the synthetic resin forming the matrix of the fiber-reinforced resin. A base layer film having a film thickness of 30 to 300 μm, and a film thickness of 50 to 300 μm made of an organic polymer material of the same kind as the synthetic resin which also constitutes the matrix of the fiber reinforced resin on the surface of the base layer film, and the surface roughness (Rz It is desirable that a base layer consisting of a roughened coating having a thickness of 40 to 130 μm is formed, and the porous ceramic sprayed layer is formed on the base layer.

Further, the surface property of the pressure roller for transferring and transferring the material to be printed is typically a surface roughness (Rz) of 15-40.
It is desirable that the thickness is μm, and it has smooth unevenness.

Further, the roller for pressure-bonding / transferring the object to be printed can be preferably used as a guide roller for a rotary printing machine.

The present invention is also a roller for treating a film-like body having an adhesive migration substance applied to its surface, wherein a porous ceramic sprayed layer and the ceramic sprayed layer are formed on a fiber-reinforced resin roll base material. And a low surface energy resin layer formed on the surface of and in the hole of the composite coating film is formed.

[0022]

As described above, the roller for pressure-bonding / transferring the object to be printed according to the present invention is formed on the surface of the fiber-reinforced resin roll base material, on the surface of the porous ceramic sprayed layer and on the surface of the ceramic sprayed layer and in the holes. And a low surface energy resin layer thus formed. FIG. 1 is a diagram schematically showing a cross-sectional structure in one embodiment of such a roller for pressure-bonding / transferring an object to be printed according to the present invention,
FIG. 2 is an enlarged schematic view showing a sectional structure of a roller for pressure-bonding / transferring an object to be printed according to the present invention, and FIG.
It is a figure which shows typically the cross-section structure in the manufacturing process of the roller for pressure bonding and transfer of the to-be-printed body which concerns on this invention. Note that the vertical and horizontal scale ratios are exaggerated in these figures.

In order to obtain the pressure-bonding / transferring roller for the printing material of the present invention, first, as shown in FIG. 3, a ceramic sprayed layer 15 is formed on the surface of the fiber-reinforced resin roll base material 10.
In the example shown in this figure, on the surface of the roll base material 10, in order to improve the adhesion of the ceramic sprayed layer 15, a base layer 14 composed of a base layer 11 and a roughened layer 12 as described later is formed. Is formed, and the ceramic sprayed layer 15 is formed thereon. In the figure, reference numeral 13 indicates a granular solid organic polymer material mixed in the roughened layer 12.

The surface of the ceramic sprayed layer 15 thus formed has short periodic irregularities (pitch wave irregularities) that form very sharp protrusions as shown in the figure, and even longer periodic irregularities (waviness). Rough surface formed in combination with (shaped irregularities), typically preferably Rz 20 to 50 μm
The ceramic sprayed layer 15 has a rough surface to some extent and is porous, and preferably has fine pores of 0.1 μm to several tens of μm with a porosity of 5 to 20%.

Here, when a low surface energy resin such as a silicone resin is impregnated and coated from the upper portion of the ceramic sprayed layer 15 and dried and solidified, FIG.
2 and 2, the low surface energy resin layer 16 is formed on the surface of the ceramic sprayed layer and in the holes. As described above, the low surface energy resin 16 has the pitch-wavy irregularities in the ceramic sprayed layer 15 and is porous, so that the ceramic sprayed layer 15 is anchored by entering into these portions.
Adhesion with and good composite coating, ceramic sprayed layer 1
5 and low surface energy resin layer 16 for composite coating film 1
7 is constituted.

Further, the low surface energy resin 16 covers substantially the entire surface of the ceramic sprayed layer 15, but is thickly attached to the pitch wavy concave portions and thinly attached to the pitch wavy convex portions. For this reason, the surface texture becomes smoother than the state in which only the ceramic sprayed layer 12 is formed, but the unevenness due to the ceramic sprayed layer 15 is not completely buried, and the waviness-like unevenness is generally maintained. A rough surface having smooth unevenness can be formed. The final surface roughness Rz is typically 15 to
It is desirable to set the thickness to about 40 μm. Further, it is desirable that the final convex portions in the smooth unevenness (the convex portions of the waviness) are uniformly dispersed at a rate of about 1 per 30 μm × 30 μm square to 60 μm × 60 μm square. The convex portion referred to here means that the surface of the object to be measured has a length of 2
It refers to a convex portion having a height of 70% or more of the height of the highest convex portion in this measurement region, which is measured by two-dimensionally scanning over 0 mm × width 20 mm.

For this reason, when the roller for pressure-bonding / transferring the object to be printed according to the present invention comes into contact with the object to be printed, it does not contact the entire surface of the roller but only the smooth projection as described above. In addition, since there is a low surface energy resin on the surface, the transfer of ink from the printing medium does not occur easily, and the transferred ink also has a smooth surface due to the low surface energy resin. Since it has a profile of, it can be easily removed by simply touching it with a dry cloth material.

Further, as described above, the low surface energy resin layer 16 is composited with the ceramic sprayed layer 15 and applied to the surface, 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. The waviness is expressed as “waviness” for the purpose of comparison with the finer pitches, but it is visually unnoticeable. Therefore, the resin layer 16 on the surface of the projection is not visible. However, even if the ceramic sprayed layer 15 is exposed due to abrasion, and ink adhesion or reverse transfer occurs at this portion, there is no problem in print quality.

[0029]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in more detail based on embodiments.

A fiber-reinforced resin is used as the roll base material in the roller for pressure-bonding / transferring the printing medium of the present invention.

As the synthetic resin constituting the matrix of the fiber reinforced resin, epoxy resin; unsaturated polyester resin; phenol resin; thermosetting resin such as alkyd resin or amide resin such as various nylons; polycarbonate; urethane resin; polyacetal Amorphous polyether resins such as polyethersulfone, polysulfone and polyetherimide; thermoplastic resins such as saturated polyester resins such as polyethylene terephthalate and polybutylene terephthalate may be used. Of these, a thermosetting resin is preferable, and an epoxy resin is particularly preferable.

On the other hand, as the reinforcing fiber of the fiber reinforced resin,
Carbon fiber, silicon carbide fiber, boron fiber, potassium titanate fiber, glass fiber and the like can be exemplified, and these can be used alone or in combination, but especially carbon fiber alone or carbon fiber as a main component and some other fibers. It is desirable to use the compounded one. In the present specification, the "carbon fiber reinforced resin" is not limited to one using only carbon fibers as reinforcing fibers, but mainly carbon fibers (specifically, 50% or more), and other fibers. It includes those using a mixture of

The type of carbon fiber is not particularly limited and may be appropriately selected from PAN-based, pitch-based or a mixture of these, depending on the characteristics required for the roller, for example, higher elasticity. If the modulus is required, the pitch type is used. If not so high elastic modulus is required and the economy is prioritized, PA is used.
It is suitable to use an N-based material. Further, whether the filament is a short filament or a long filament is mainly determined by a molding method as described below, and is not particularly limited. For example, when a higher elastic modulus is required, it is preferable to use a long filament.

There are various methods for forming a roll base material using such a fiber reinforced resin, and there are various methods such as a sheet wrapping method, a filament winding method, a pultrusion molding method and a resin transfer molding method, and the method is not particularly limited. Those formed by the sheet wrapping method and the filament winding method are formed by lapping or filament winding on a metal mandrel, followed by heat curing or heat melting to form a raw pipe. The material formed by the drawing method is drawn by a pipe-shaped die to form a raw pipe. What is molded by the resin transfer molding method is molded by a metal mold or a resin mold.

The tube formed in this manner is generally lengthened to determine the length of the roll, and then a header or journal is attached. The header or journal can be joined by mechanical joining, adhesive joining, or a combination thereof. After that, the outer peripheral portion of the roll is polished, ground, etc. and, if necessary, the bearing fitting portion, the bearing portion and the like are finished. Alternatively, or alternatively, the outer peripheral portion of the roll may be polished before the header or the journal is joined, and then the header or the journal may be joined to finish the bearing fitting portion and the bearing portion.
The roll base material needs to have a predetermined diameter accuracy by polishing or the like. That is, the roller for pressure-bonding / transferring the printed material according to the present invention cannot perform such cutting and polishing as a final finish.

In this way, the ceramics sprayed layer is formed after the outer diameter is adjusted by polishing the outer periphery of the roll or the like, and the adhesion strength between the fiber-reinforced resin roll base material and the ceramics sprayed layer is increased. Therefore, it is desirable to form an underlayer on the roll base material as a pretreatment before the ceramics thermal spraying.

As a pretreatment for ceramics thermal spraying, a surface treatment for roughening the surface of a fiber-reinforced resin roll base material by sanding, zinc phosphate treatment, blast treatment or the like is conceivable. Since the treated base material is fibrous, the fibers in the surface layer are cut and broken, which promotes fluffing of the fibers, and a uniform film is not formed by thermal spraying on the surface. On the occasion,
It is not so preferable because there is a problem that the blast material and the fine powder of the substrate to be treated scatter and float in the air, which causes a deterioration of the environment.

The underlayer is not particularly limited, but a base layer coating made of an organic polymer material of the same kind as the synthetic resin forming the matrix of the fiber reinforced resin of the roll base material, and the surface of the base layer coating Similarly, it is desirable that the carbon fiber reinforced resin matrix is composed of a synthetic resin and a roughened film made of the same kind of organic polymer material. In particular, the film thickness of the base layer coating is 30 to 300 μm.
Most preferably, the surface-roughened film has a thickness of 50 to 300 μm and a surface roughness (Rz) of 40 to 130 μm.

The surface-roughened film is composed of the above-mentioned organic polymer material forming the matrix and the granular solid organic polymer material serving as the bone agent, as will be described later. The layer, if the organic polymer material constituting the matrix is the same kind as the synthetic resin constituting the matrix in the fiber-reinforced resin of the roll substrate,
Even the solid organic polymer material contained in the roughened layer does not necessarily have to be of the same type as the synthetic resin constituting the matrix in the fiber-reinforced resin of the roll base material, and can be stably dispersed in the matrix. It is not particularly limited as long as it is one. Of course, it is certainly preferable that the organic polymer material constituting the matrix of the surface-roughened layer has physical properties similar to those of the thermal expansion coefficient, and that the same kind as the organic polymer material is preferable. .

In such a structure, the base layer coating fills in defects such as fluff and fine voids on the surface of the roll substrate to correct the surface of the roll substrate to provide smoothness, and the surface-roughened film is ceramic sprayed. It functions to contribute to the improvement of the adhesiveness with the coating.

Such an underlayer is formed, for example, on the surface of a fiber-reinforced resin roll base material by adding an organic polymer material with a diluent of 5 to 1
A solution containing 5% by weight is spray-applied from a direction substantially orthogonal to the peripheral surface of the roll base material and dried to form a base layer coating, and the surface of the base layer coating is granular, preferably granular with an organic polymer material. Solid organic polymer material 60 having a diameter of 10 to 45 μm
It can be carried out by spray-coating a composition containing 80 to 80% by weight and 30 to 120% by weight of a diluent on the peripheral surface of the roll from a direction of less than 90 ° and drying to form a roughened film.

In the formation of the base layer coating in the above-mentioned method, if the diluent is less than 5% by weight, air is apt to be entrained in the formed base layer upon air spray coating, while if it exceeds 15% by weight, a smooth coating is formed. Difficult to form. Further, if the base layer coating is less than 30 μm, it is insufficient as a correction coating on the surface of the fiber reinforced resin roll base material, and therefore the base material defects cannot be eliminated, and if it exceeds 300 μm, the final dimensional accuracy of the roll is unstable. There is a risk that

In forming the surface-roughened layer, if the particle size of the particulate solid organic polymer material is less than 10 μm, the function as an aggregate is not exerted, and if the particle size exceeds 45 μm, the air spray nozzle is rolled. 9 to the tangent to the peripheral surface of the substrate
Since they are arranged so as to face each other so as to be less than 0 °, there is a fear that an excessive particle shielding phenomenon occurs in the roughened layer to be formed, and the adhesion force with the ceramic sprayed coating formed in the next step cannot be improved. This happens. If the amount of the particulate solid organic polymer material is less than 60% by weight, the resin content is supported if the amount exceeds 80% by weight, because the complicated cross-sectional shape of the rough surface due to biting into the resin component, collision, etc. is not accumulated. Lack of power,
There is a possibility that the adhesion with the ceramic sprayed coating formed in the next step may not be improved. 30% by weight of diluent
If the amount is less than 120% by weight, the viscosity of the resin component reduces the amount of movement of the blended solid particulate organic polymer material during the air spray application, making it impossible to form a rough surface having a complicated cross-sectional shape. If so, the resin content is insufficient, and a sufficient anchor effect cannot be exhibited. Further, if the film thickness is less than 50 μm, the adhesion to the base layer is poor even if the surface roughness is appropriate, and the adhesion of the ceramic sprayed coating formed in the next step is reduced, while it exceeds 300 μm. In such a case, the flat surface becomes a rough surface, and the adhesion with the ceramic sprayed coating in the next step may be reduced.

Further, in the above method, the roughening layer, which is the upper layer of the underlayer, is 90 ° to the tangent to the peripheral surface of the roll base material.
The air spray is applied from the direction below, but when the air spray is applied from the direction orthogonal to the peripheral surface tangent of the cylindrical object, the atomized solution is divided into two parts at the orthogonal part and flows along the peripheral curved surface. The coating layer having a required thickness is formed by making one rotation of the cylindrical object, but when air spray coating is applied from a direction of less than 90 ° to the tangent to the peripheral surface, the coating layer is divided into two at an orthogonal portion. When flowing, more flow along one side of the circumferential curved surface than that of the other side, which causes the particulate solid organic polymer material in the atomized solution to cut into the resin during the formation of the coating layer and scrape along with the shielding phenomenon by the particles. This is because a rough surface having a complicated cross-sectional shape can be formed due to collisions with each other, repulsion or the like.

In the roller for pressure-bonding / transferring the printed material according to the present invention, as the surface treatment method for forming the ceramic sprayed coating, the above-mentioned base layer and roughening layer are fiber-reinforced of the roll base material. The method of forming the resin matrix from an organic polymer material of the same kind as the synthetic resin is most preferable, but other known methods, for example, as described in Japanese Utility Model Publication No. 4-7378, organic materials are used. It is also possible to form an underlayer consisting of
It is possible. However, when an underlayer made of an organic material and an inorganic material as an aggregate is formed as the underlayer in this way, thermal expansion of the underlayer or the fiber-reinforced resin roll base material and the ceramics sprayed coating due to heat during ceramics spraying There is a possibility of peeling of the ceramic sprayed layer due to the difference, and from the viewpoint of product yield and product durability, the above-mentioned base layer and roughened layer constitute the matrix of the fiber-reinforced resin of the roll base material. Compared to the case of using a method of forming an organic polymer material of the same kind as the synthetic resin, there is a high possibility that it will be inferior.

Then, a ceramics sprayed layer is formed on the surface of the fiber-reinforced resin roll base material or the surface of the underlayer as described above by using a known ceramics spraying method such as a plasma jet spraying method. Ceramic materials include Al ₂ O ₃ , TiO ₂ , and Al ₂ O ₃ −.
_{TiO 2, Cr 2 O 3,} ZrO 2, WC, WC-Co,
Examples thereof include, but are not limited to, Cr ₃ C ₂ , TiC and the like, or a mixture thereof, and a composite coating in which ceramics and a metal are simultaneously sprayed to have conductivity, cermets and the like. The choice of ceramic materials is the adhesion strength with the roll base material or the underlayer, abrasion resistance,
And the obtained ceramic sprayed layer is several μm to several tens μ
It may be carried out in consideration of economical efficiency in that it has fine pores of m (continuous pores) with a porosity of 5 to 20% and has a surface roughness of about Rz 20 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.

The ceramic sprayed layer is desired to have 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, 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 peelability may be increased, while the porosity is 20%. This is because the strength of the ceramic sprayed layer, which is the skeletal structure of the composite coating, may be reduced if the content exceeds the range. Further, it is desired that the surface roughness has a Rz of about 20 to 50 μm so that when a low surface energy resin as described later is deposited on the surface of the ceramic sprayed layer, the body surface energy resin is stably attached. This is because, in the end, it is a range in which 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 40.
It is desired that the thickness is about 80 μm. That is, if the average film thickness is less than 30 μm, it may not be possible to obtain a sprayed layer which is uniform and has sufficient properties such as adhesion, strength and abrasion resistance, while the average film thickness exceeds 200 μm. It is disadvantageous in terms of cost. Further, in a mode in which 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, the final finishing diameter is D
This is because it is necessary to keep the cylindricity at 0.02 mm or less and the cylindricity at 0.020 or less.

The surface roughness of the ceramic sprayed layer is
As described above, it is generally desired that the Rz is about 20 to 50 μm, but the optimum surface roughness required as the final product differs depending on the type of roller, and for example, in a machine for printing a thin film such as a gravure printing machine. Since it is desirable for the guide roller and the like to have a final surface roughness finer than a typical Rz of about 15 to 40 μm, the surface may be lightly sprayed after ceramic spraying as necessary so that such a final surface roughness can be obtained. It is also possible to carry out polishing.

When the ceramic sprayed layer is formed in this manner, a low surface energy resin is impregnated and coated from the upper portion by a method such as spraying, dipping, brush coating, roller coating, etc., 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 mainly of a methyl group and / or a phenyl group, and more preferably a methyl group, which is polymerized and made into a three-dimensional structure after application and has a Si—O—Si bond and an organic group. 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.

[0053]

Embedded image

(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 30,000.) However, of course, the silicone resin composition used is not limited to such a silicone release agent.

If necessary, 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 film. Also, the particle size must be such that it can sufficiently penetrate into the recess.

As the fluorine atom-containing resin, a thermoplastic fluorine atom-containing resin such as polychlorotrifluoroethylene, polyvinylidene fluoride, polyvinyl fluoride, etc. is used, and the resin is suspended or swollen in an appropriate solvent and applied at a melting temperature. It is also possible to use a dispersion processing method such as heating to form a film above, but in order to more reliably form a film on the surface of the ceramic sprayed layer and in the pores, a small amount of hydroxyl group in the molecular chain, It is preferable to use a thermosetting fluorine atom-containing resin that has a functional group such as a carboxylic acid group and can be applied in a liquid state, and that can be crosslinked and cured at room temperature or by heating, for example, fluoroethylene and acrylic acid, methacrylic acid and And the like.

As described above, the thickness of the low surface energy resin layer formed on the surface of the ceramic sprayed layer is thick on the pitch wavy concave portions of the ceramic sprayed layer and thin on the pitch wavy convex portions of the ceramic sprayed layer. It is difficult to define it as a 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 roller for pressure-bonding / transferring the object to be printed according to the present invention thus obtained has a final surface having unevenness, and its surface roughness Rz is representative.
Is preferably about 15 to 40 μm, and the smooth uneven projections on the final surface are, for example, 20
About 1 μm per μm × 20 μm square to 100 μm × 100 μm square, more preferably 30 μm × 30 μm square
It is desirable that the particles are uniformly dispersed at a rate of about 1 per 60 μm × 60 μm square. The entire surface thereof is formed by a dense low surface energy resin layer held on the ceramic sprayed layer as a composite coating film, and 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 for a printing material in various printing machines. Specifically, for example, an impression cylinder in an offset printing machine, or Offset press (newspaper press, commercial offset press, foam press),
It can be suitably used as a guide roller in various rotary presses such as a gravure printing machine, a flexographic printing machine and a letterpress newspaper press.

The roller of the present invention as described above is used not only in the field of printing machines, but also as a roller for treating a film-like body having an adhesive migration substance applied to its surface, like the ink in the printed matter as described above. Similarly, it is obvious that the roller can be preferably used as a material having high durability and less likely to cause contamination of the roller by these adhesive migration substances.
Examples of the application other than the pressure roller for transferring and pressure-transferring the object to be printed in the printing machine include, for example, rollers in the pressure-contacting / transfer system for the object to be transferred in various copying machines, but are not limited thereto. Absent.

[0061]

EXAMPLES Hereinafter, the present invention will be described more specifically with reference to examples. Reference Example 1 After attaching a flange shaft configured as a rotary shaft of a roller to both ends of a hollow cylindrical object made of a carbon fiber reinforced epoxy resin (CFRP) made by a filament winding method, the outer diameter is obtained by grinding or the like. Adjusting the dimensions and smoothing the surface of the CFRP roller tube (diameter 99.5 mm x
A length of 1730 mm) was produced.

After cleaning the surface of the CFRP roll base with thinner, an epoxy resin (manufactured by Dainippon Paint Co., Ltd .: trade name Eponix #), which is an organic polymer material of the same kind as the matrix of the CFRP roll base, is used. Main ingredient of 10) /
A solution prepared by mixing 10% by weight of a thinner as a diluent with 100/100 (weight ratio) of a curing agent was applied by air spray to the peripheral surface of the base material of the CFRP roll from the orthogonal direction,
And dried for 3 hours to form a base layer having a film thickness of 60 μm.

Then, on the peripheral surface of the CFRP roll base material on which this base layer was formed, the same epoxy resin (Eponics # 10) as described above was used, and a granular solid organic polymer material having a particle size of less than 45 μm (US Technology Co., Ltd.). Far East: 80% by weight of product name Polyplus) and thinner 100
A composition containing 100% by weight is applied by air spray from a direction inclined by 30 ° with respect to the direction orthogonal to the peripheral surface tangent of the CFRP roll base material, and dried and cured at 80 ° C for 3 hours to give a film thickness of 100 μm and a surface. A roughened layer having a roughness Rz of 80 μm was formed.

Then, the CFRP having this roughened layer is formed.
Plasma spray machine (Metco Co., Ltd.)
Manufactured by METECO 10MB), and subsequently G-Al ₂ O ₃ (Al ₂ O ₃ -2.
3% TiO ₂ ) was plasma sprayed to form a ceramic sprayed layer having a film thickness of 100 μm and a surface roughness Rz of 50 μm.
Finally, the surface of the ceramic sprayed layer was lightly polished with sandpaper (# 120) to obtain a surface roughness Rz 4
Finished to 0 μm.

The surface of this ceramic sprayed layer was a rough surface that undulated while having sharp projections as shown in FIG. The ceramic sprayed layer is 0.1 to several tens of μm.
The size of the voids was about 16% and the porosity was about 16%. The guide roller thus obtained was subjected to the following printing test.

Example 1 After forming a base layer, a roughening layer and a ceramics sprayed layer on a CFRP roll by the same procedure as in Reference Example 1 above,
From above the ceramic sprayed layer, silicone resin release agent (KE1310-S manufactured by Shin-Etsu Chemical Co., Ltd.) 100
Part, 400 parts of toluene, 10 parts of a curing catalyst (CAT-1310 manufactured by Shin-Etsu Chemical Co., Ltd.), and 1 part of a curing catalyst (X93-405 manufactured by Shin-Etsu Chemical Co., Ltd.) are mixed and stirred to impregnate them with a spray method. After coating, it was dried and solidified in a drying oven at 110 ° C. for 30 minutes to form a silicone resin film on the surface of the ceramic sprayed layer. This silicone-based resin film completely closes the communicating pores of the ceramic sprayed layer and adheres thickly to the recesses of the pitch wave-like irregularities and thinly to the protrusions on the surface of the sprayed layer, completely covering the entire surface. The film thickness was in the range of 2 to 20 μm, although it varied depending on each part. The surface roughness Rz after forming the silicone resin film is about 3
It was 0 μm and was a rough surface having smooth unevenness as shown in FIG. The guide roller thus obtained was subjected to the following printing test as in Reference Example 1.

Printing Test Each of the guide rollers prepared in Reference Example 1 and Example 1 was attached to a position immediately after the printing section of a newspaper rotary press (Tokyo Machine BB type) to perform a printing test.

As a result, in Reference Example 1, although the profile of the roller surface has an uneven structure, the ink adheres and deposits not only to the convex portions but also to the concave portions after the operation for about 2 hours, which is a commonly used chromium. Compared to the plating roller, the effect of preventing ink adhesion was not seen. In addition, even when washed with a petroleum-based solvent, it was difficult to remove the ink that had entered the recesses, and on the contrary, the workability was poorer than that of the mirror-polished roller after chrome plating.

On the other hand, in the case of the guide roller of Example 1, even if the printing of the morning edition and the evening edition is repeated every day, only a small amount of ink adheres to the fine projections on the surface, and the ink adhesion amount is 1 After a lapse of months, there was almost no accumulation, and during this period, it was possible to obtain a printed matter of good print quality without cleaning the guide roller during the process.

Even in the long-term test for one year, the silicone release agent in the convex portion was only partially worn and the release agent in the concave portion remained firmly, and the ink adhesion preventing effect was sufficiently maintained. It was a thing.

By adopting the guide roller of Example 1 as the guide roller for the entire line of the newspaper rotary press, C
Weight reduction effect by using FRP roller (Approx.
In 3), since the ability to follow the speed is good, it is possible to obtain extremely excellent ink releasability and durability while maintaining the original purpose of using the CFRP roller, which enables delicate tension control. I was able to.

[0072]

As described above, the roller for pressure-bonding / transferring an object to be printed according to the present invention has fine surface characteristics and relatively smooth irregularities, and ceramics spraying excellent in abrasion resistance. Since the base material surface is coated with a composite coating consisting of a layer or an inorganic fine particle layer and a low surface energy resin layer such as a silicone-based resin having a low surface energy, it is difficult for ink to adhere to the surface. . In addition, since fiber reinforced resin such as carbon fiber reinforced resin is used as the roll base material, it is lightweight and has high rigidity, and even under high speed rotation,
There is no vibration or noise, and it is possible to finely control the tension on the printed material. For this reason, various rollers arranged in the press-bonding and transfer system of the printing object in various printing machines,
For example, it can be suitably used as a guide roller in various rotary presses such as offset rotary presses (newspaper rotary presses, commercial offset rotary presses, foam rotary presses), gravure printing machines, flexographic printing machines, or impression cylinders in offset printing machines. In particular, it can be applied to high-speed printing machines, and when performing a large amount or long-lasting printing operation continuously, there is no need to perform a washing operation, and a printed matter of good print quality without stains is provided. It can be made, and its durability is excellent. Further, since the ink adhered to the surface can be easily removed by a dry method or a petroleum solvent etc., the cleaning operation of the roller, which has been extremely dangerous and hard work in the past, becomes extremely easy. .

[Brief description of the drawings]

FIG. 1 is a diagram schematically showing a cross-sectional structure of an embodiment of a roller for pressure-bonding / transferring an object to be printed according to the present invention,

FIG. 2 is a diagram further schematically showing a sectional structure of a roller for pressure-bonding / transferring an object to be printed according to the present invention,

FIG. 3 is a diagram schematically showing a cross-sectional structure in a manufacturing process of the roller for pressure-bonding / transferring an object to be printed according to the present invention,

FIG. 4 is a diagram showing a schematic configuration of a printing and transporting mechanism of an object to be printed in an offset printing machine (rotary press).

[Explanation of symbols]

1 ... plate cylinder, 2 ... blanket cylinder, 3 ... impression cylinder,
4 ... Printed material, 5 ... Ink image, 6,
8 ... Transfer ink image, 7 ... Guide roller, 10 ... Fiber reinforced resin roller base material, 11 ... Base layer, 12 ... Roughening layer, 13
... Granular solid organic material, 14 ... Underlayer, 15 ... Ceramic sprayed layer, 16 ... Low surface energy resin layer, 17 ...
Composite coating film.

Front page continued (72) Inventor Fumiaki Otsubo 2113-2, Kinohama, Aboshi-ku, Himeji-shi, Hyogo Yoshikawa Kogyo Co., Ltd.

Claims (6)

[Claims] 1. A roller for press-bonding / transfer of a print-object, which is arranged in a press-bonding / transfer system of the press-contacting and transferring the print-target object in the printing device, the fiber-reinforced resin. 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 on a roll-making base material. Roller for pressure contact and transfer of printed material. 2. The roller for pressure-bonding / transferring an object to be printed according to claim 1, wherein the fiber-reinforced resin roll base is a carbon fiber-reinforced resin roll. 3. The fiber-reinforced resin roll base material,
A base layer coating having a film thickness of 30 to 300 μm, which is made of an organic polymer material of the same kind as the synthetic resin forming the matrix of the fiber reinforced resin, and the same kind of synthetic resin forming the matrix of the fiber reinforced resin on the surface of the base layer coating. An underlayer made of a surface-roughened coating made of an organic polymer material and having a film thickness of 50 to 300 μm and a surface roughness (Rz) of 40 to 130 μm is formed, and the porous ceramic sprayed on the underlayer. The roller for pressure-bonding / transferring an object to be printed according to claim 1 or 2, wherein a layer is formed. 4. The surface texture of the roller is a surface roughness (R
z) The roller for pressure-bonding / transferring of the printed material according to any one of claims 1 to 3, wherein the roller has a smooth unevenness of 15 to 40 µm. 5. The roller for pressure-bonding / transferring an object to be printed according to claim 1, wherein the roller is a guide roller for a rotary printing press. 6. A film-shaped processing roller having a surface to which an adhesive migration substance is applied, comprising: a porous ceramic sprayed layer and a surface of the ceramic sprayed layer on a fiber-reinforced resin roll substrate. And a low-surface-energy resin layer formed in the hole, wherein a composite coating film is formed.