JP3518622B2 - Matting method of recording material and atomizing device therefor - Google Patents

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to the surface of a recording material and / or
Alternatively, it relates to a method of matting the back surface.

[0002]

2. Description of the Related Art Conventionally, there are a wide variety of techniques relating to the production of recording materials. One of them is to make the front and back surfaces of a photographic light-sensitive material matte to prevent static electricity, prevent photographic light-sensitive materials from adhering to each other, and improve vacuum adhesion. Improvements are being made. As an example, in the case of forming an image on a conventional photographic light-sensitive material, a film master is overlaid on the light-sensitive material, and when exposed through the film master, the surface of the light-sensitive layer of the light-sensitive material is overlapped with the film to form a clearer image. It is necessary to bring the original plate into close contact with each other so that the exposure image is not blurred due to the gap between the two. Therefore, generally, using a vacuum baking frame, the photographic photosensitive material and the film original plate are arranged in an overlapping manner between the glass plate and the rubber sheet of the baking frame, and a vacuum is applied between the glass plate and the rubber sheet to bring them into close contact with each other. A method (hereinafter, this method is referred to as a vacuum contact method) has been carried out.
As described in Japanese Patent Publication No. 02-202, it was considered that the photosensitive layer was formed into a mat to significantly shorten the vacuum adhesion time by providing the photosensitive layer. The formation of a fine pattern (matting) on the photographic photosensitive layer is described in, for example, Japanese Patent Laid-Open No.
1-96604, JP-A-51-98505, JP-A-55-12974 and the like.

In recent years, a so-called double-sided type photographic light-sensitive material in which a light-sensitive layer is provided on both sides of a support has been remarkably popular. In the case of such a photographic light-sensitive material, for example, JP-A-51- As described in Japanese Unexamined Patent Publication No. 96604, when it is attempted to provide a fine pattern on both photosensitive layers by a gravure coating method, first, the fine pattern is applied to one surface and dried, and then the fine pattern is applied to the other surface. Therefore, this series of devices becomes quite large in scale, and the process of applying the fine pattern coating on the back surface by the above method until it is cut to a desired size. When the image is exposed to the photosensitive layer on the back side, the vacuum contact time is longer than that on the front side. There has been made to cause disadvantage. Also,
Even in the exposure step, there was a problem that the coating part of the micro pattern on the back side exposed later was pressed and crushed by the printer during the vacuum drawing exposure on the front side, and it took a long time to vacuum the back side. .

Further, in JP-A-51-98505, in order to solve the problem that a coating layer for improving vacuum adhesion stains the original film image, a waxy or fine powder resin having releasability is used. A method of dispersing it in an organic solvent having a boiling point and applying it by air spray has been shown, but since this coating layer has weak adhesion to the surface of the photosensitive printing plate, it is easy to fall off, and the above-mentioned problems still occur. there were. In addition, it is not preferable to use an organic solvent for safety during production.

Further, JP-A-55-12974 discloses a method of spraying a solid powder and fixing it on a photosensitive printing plate by heat. In the case of a double-sided type photosensitive printing plate, it is disclosed. There is a problem in that the mat layer on one side is crushed when it is conveyed by rollers until it is cooled after heat fusion. On the other hand, it is difficult to convey without using rollers. Further, in order to produce powder, the resin has to be crushed and classified, resulting in a high cost.

Further, Japanese Laid-Open Patent Publication No. 55-101951 discloses a method for uniformly dispersing and adhering solid powder on the surface of a photosensitive printing plate which is continuously running.
Powder feeder, ejector, distributor,
Cyclone etc. are required, and the device becomes quite complicated and large scale. Moreover, when the double-sided type photosensitive printing plate is conveyed, there is a drawback that the solid powder easily falls off.

In order to solve these problems, JP-A-57 / 57
No. 34558 discloses a method in which an aqueous liquid in which a resin is dissolved or dispersed is sprayed on the surface of a photosensitive printing plate having a photosensitive layer on a support and dried. The performance of the mat is very good in this way,
It contains some difficulties in terms of manufacturing suitability. In other words, when air spray is used, the deposition rate of fine droplets is very low (about 10%), so the droplets that did not deposit stain the inside of the coating chamber as overspray, and in extreme cases, coating is performed. This results in unwanted resin buildup on the plate. In order to reduce this overspray, an electrostatic coating method was considered (adhesion rate of about 90% or more).

[0008]

However, when the aqueous liquid is applied by the electrostatic coating method, there are the following problems. First, in the case of the electrostatic coating method, electrostatically fine particles (droplets)
Since it adheres to the surface of the object to be coated, it cannot be in strong contact with the surface of the object to be coated. Will only be electrostatically attached to the surface. As a result, when the photosensitive material is conveyed while being brought into contact with a roll or the like, similarly to the problem in the above-mentioned method, the adhered particles fall off and the desired vacuum adhesion time is not shortened, and the original film or the original film is conveyed. This will result in soiling the rollers. Further, in the bell type and the disc type, the aqueous liquid is dried at the place where the liquid flow of the thin film on the bell or the disc is bad, and the resin is deposited, which hinders atomization or the deposited resin is covered. It adheres to the applied material.

To solve this problem, Japanese Patent Publication No. 61-4
In Japanese Patent No. 8994, before and / or after the charged fine liquid droplets of the coating liquid adhere to the front surface and / or the back surface of the recording material, the surface is wetted and the liquid droplets are wetted and spread to firmly adhere. The method is described, and in addition, the actual development method 59-6
Japanese Patent No. 5763 discloses a bell structure for preventing the precipitation of resin. However, these methods have the drawback that not only the apparatus becomes complicated, but also the manufacturing of the apparatus for realizing them is very expensive and labor intensive.

In Japanese Patent Application No. 4-354769, outside the atomized flow of the coating liquid for matting the recording material and
By supplying the moisturizing body flow in the direction of the atomization flow, the liquid particles that make up the atomization flow are prevented from drying, and the liquid particles are prevented from scattering toward the outer peripheral side, and the flight speed of the liquid particles is increased by the moisture retention body flow. We have proposed a method of strengthening the adhesion form of the liquid particles to the recording material by this method, but when applying to a recording material with a width that changes continuously, this method does not respond to the change. This is not easy, and the matting agent cannot be applied uniformly over the entire width of the recording material. Further, a recording material having a width narrower than the diameter of the atomized flow has a drawback that it is excessively applied and stains the surroundings.

When the ink jet system is used,
The problem that minute particles fall off by a pass roller on the way or the inside of the coating chamber is contaminated can be solved, but each nozzle requires a vibrating element, an electrode, etc., which makes the mechanism complicated and expensive.

Although the above description relates to an example of improving the vacuum adhesion of the photographic light-sensitive material, matting of the photographic light-sensitive material is used to prevent static electricity, adhesion of photographic light-sensitive materials to each other,
It is provided to prevent adhesion, and the matte portion is not limited to the surface of the photosensitive layer, and the back surface thereof may be matted. The matting applied for these purposes also has the same problems as in the case of improving the vacuum adhesion.

One of the objects of the present invention is to prevent the atomized flow for matting the recording material from being dried and scattered, and
The atomized flow is easily adhered to the recording material in response to the change of the width of the recording material, and further the matte particles are firmly adhered to the recording material so as not to be flattened or fall off during the handling of the recording material. Another object of the present invention is to provide a matting method for various recording materials.

Another object of the present invention is to provide an atomizing device which can be used in a method for matting a recording material, is simple, and has a small number of additional equipment.

[0015]

According to the present invention, the above object can be achieved by the following matting method and rotary atomizing apparatus for recording materials.

Due to the moisturizing body flow supplied in the outer peripheral side of the atomizing flow for matting the recording material and in the atomizing flow direction, the cross section perpendicular to the atomizing flow direction is a non-round shape.
In the cross section of the atomizing flow is restricted to Jo, set according to the angle of the atomized flow cross section up to the radial direction makes with the recording material width direction to the width of the recording material, attaching the atomizing stream recording material A method for matting a recording material, which comprises a step of:

In the above method, it is preferable that the circumference of the non-round circle is opened in the direction of the atomization flow and around the axis in the direction of the atomization flow.
Supplying the coercive moisture fluid flow from placed coercive moisture fluid flow supply hole above, by moving the holding moisture fluid flow supply hole around the axis of the atomized stream direction, according to the angular width of the recording material To set.

A rotary atomization unit which is composed of a bell-shaped or cup-shaped rotary body having a large diameter portion as an opening end and which rotates around a rotation axis of the rotary body; and a drive unit which rotates the rotary atomization unit, The moisturizing body flow supply hole is provided so as to be retracted from the opening end and opens in the atomization flow direction, and the moisturizing body flow supply hole surrounds the rotation shaft and has a non-true diameter equal to or larger than the opening end. The rotary atomizer, which is arranged annularly on the circumference of a circle and defines a maximum diameter of the ring, the moisture retaining body flow supply hole being movable in the circumferential direction of the ring.

The concept of the present invention will be described in detail below.

As a result of studying the formation of a mat with a uniform distribution over the entire width of a recording material whose width changes continuously, the inventors have appropriately changed the distance of the moisture retaining body flow from the outer periphery of the atomized portion. It was found that by doing so, the atomization flow in the width direction of the recording material can be regulated.

More specifically, the inventors conducted an experiment using a rotary atomizer having a diameter of 50 mm on the outer circumference of the rotary atomizer. Distance from the surface of the recording material to the rotary atomizer 5
When the matting agent was applied to the recording material by placing it at a position of 00 mm and applying a voltage of -50 kV, the coating width by the rotary atomizer was 700 mm, and the coating material of 400 mm width or 600 mm width was applied. When it was carried out, generation of powdery particles was observed on the surface of the recording material, and scattering of the matting agent to the surroundings was observed.

Here, the diameter of the slit portion is 1 so that the slit portion of the annular air nozzle that is concentrically continuous with the rotary atomizing portion is arranged at a position of 65 mm from the outer circumference of the rotary atomizing portion.
80mm air nozzle from the outer edge of the rotary atomizer 1
It was set back by 5 mm.

The matting agent was applied while supplying a moisturizing body flow from the air nozzle at a pressure of 3 kg / cm ² . At this time, the coating width of the matting agent was 600 mm, and no powdery particles were observed on the surface of the recording material.

Further, this time, 30 m from the outer circumference of the rotary atomizing unit.
An air nozzle having a slit portion diameter of 110 mm was set back 15 mm from the tip of the outer peripheral portion of the rotary atomizer so that the slit portion of the annular air nozzle that was concentrically continuous with the rotary atomizer was placed at a distance of m. .

The matting agent was applied while supplying a moisture retaining body flow from the air nozzle at a pressure of 3 kg / cm ² . At this time, the coating width of the matting agent was 400 mm, and generation of powder particles was not observed on the surface of the recording material.

Therefore, the inventors have arranged the two air nozzles at the same time and continuously run a recording material having a width of 600 mm and a width of 400 mm, and when the width of the recording material is 600 mm, the moisture retaining body flows from the air nozzle having a slit diameter of 180 mm. 3
The matting agent is applied while being supplied at a pressure of kg / cm ^{2, and} the slit diameter is 110 when the width of the recording material is 400 mm.
The matting agent was applied while supplying a moisturizing body flow from an mm air nozzle at a pressure of 3 kg / cm ² .

At this time, a mat was uniformly formed in the width direction on the surface of each recording material having a width of 600 mm and a width of 400 mm, and no powdery particles were generated. No scattering of the matting agent was observed outside the width of the recording material.

However, when the above device is used,
For recording materials having a width of 600 mm and a width of 400 mm, it is possible to realize uniform application of the matting agent in the width direction while preventing scattering of the matting agent and generation of powdery particles to the surroundings.
600 mm when the recording material travels while the width of the recording material changes stepwise from 600 mm width to 400 mm width
There are drawbacks such as scattering of the matting agent for the widths other than the width of 400 mm and uniform coating in the width direction cannot be realized, and a plurality of slits are arranged corresponding to each width. Although this can be solved by a problem, the apparatus becomes complicated, and it becomes difficult to machine and becomes an expensive apparatus.

Therefore, as a result of repeated studies to solve this problem, the inventors have found that in order to realize the uniform application of the matting agent in the width direction while preventing the scattering of the matting agent and the generation of powdery particles, It suffices that the width of the material and the coating width in the width direction of the recording material by the rotary atomizer are the same, and there is no restriction on the coating width in the running direction of the recording material, and the present invention described above was completed. It was

The effect of the moisturizing body flow is twofold. One is to prevent the generation of powdery particles, and the other is to regulate the coating pattern. The application pattern refers to the shape of the range in which the matting agent is actually applied onto the recording material.

Here, if the application pattern of the atomized flow regulated by the moisture retaining body flow has a shape in which the maximum radial direction is determined such as an elliptical or polygonal non-round shape, the following method is used. The coating width of the rotary atomizer can be continuously changed according to the width of the recording material, and the rotary atomizer without scattering of the matting agent and generation of powder particles can be provided at low cost. it can.

The coating pattern of the rotary atomizer can be regulated to a non-round shape as required below by forming the air nozzle into a non-round shape such as an ellipse or a polygon.

The invention will now be described by way of examples.

The inventors conducted the following experiment between the distance from the outer periphery of the rotary atomizing section to the tip of the air nozzle and the coating width on the recording material in the equipment mentioned above based on the knowledge obtained by the experiment. I found that I could get the ceremony.

[0035]   Y = 5.71X + 228.57 (1)

Here, Y is the coating width (mm), and X is the distance (mm) from the outer circumference of the rotary atomizing section to the tip of the air nozzle.

Here, an air nozzle having an elliptical slit having a major axis length of 180 mm and a minor axis length of 110 mm is rotated with the center of the ellipse and the rotary axis of the rotary atomizer being concentric. 15m from the tip of the air nozzle from the tip of the atomizing part
It was set back with the slit facing the recording material.

The width direction of the recording material was taken as the X direction, the running direction of the recording material was taken as the Y direction, the major axis direction of the ellipse of the air nozzle was aligned with the X direction, and the minor axis direction was aligned with the Y direction.

At this time, the slit shape of the air nozzle is given by X = 90 cos α Y = 55 sin α (0 ≦ α <2π) (2) using the variable α.

Here, the major axis direction of the elliptical slit of the air nozzle is rotated θrad counterclockwise with respect to the X direction. The angle θ formed by the long axis direction of the air nozzle with respect to the width direction of the recording material is called a phase. The air nozzle shape when the phase is θ is given by X = 90 cos θ cos α −55 sin θ sin α Y = 90 sin θ cos α +55 cos θ sin α (0 ≦ θ <1 / 4π) (3)

At this time, α that gives the maximum value of X is α = tan ⁻¹ (55 / (90 tan θ))

By substituting this α into the equations (1) and (3), the coating width Y at the phase θ is determined.

[0043]

[Equation 1]

Therefore, even when the width of the recording material changes, the width Y of the recording material is given and the phase of the air nozzle is adjusted to θ obtained by solving the equation (4) to continuously apply the coating width of the rotary atomizer. Can be changed.

The examples given here are based on experimental values that have led to the completion of the present invention, and do not limit the scope of application of the present invention.

For example, by using a rotary atomizer having an outer diameter of 90 mm of the rotary atomizer and arranging the rotary atomizer at a position 800 mm from the surface of the recording material, and applying a voltage of -50 kV, a matting agent for the recording material is applied. When applied, the long axis length is 4
An air nozzle having continuous slits on the circumference of an ellipse having a length of 50 mm and a short axis of 160 mm is installed in a rotary atomizer, and a moisturizing body flow is supplied from the air nozzle to provide a coating width of 1800 mm to 10 depending on the phase of the air nozzle.
It can be continuously changed between 00 mm.

In the matting method of the present invention, when the equipment conditions such as the outer shape of the rotary atomizer, the distance from the recording material, the applied voltage, etc. are determined, the empirical formula under those conditions is derived in the same manner as the formula (1). Then, the coating width regulated by the air nozzle is adjusted to the width of the recording material by setting the major axis length and the minor axis length of the moisturizing body flow supply hole existence area of the air nozzle according to the desired coating width range. Since the moisture-retaining body flow is supplied to the outer peripheral side of the atomized flow, the liquid particles constituting the atomized flow are prevented from drying, and the scattering of the liquid particles in the atomized flow outside the width of the recording material is regulated. Do not stain the surrounding area. Further, since the moisturizing body flow is supplied to the outer peripheral side of the atomized flow and in the atomized flow direction, the flight speed of the liquid particles in the atomized flow is increased. Therefore, when liquid particles collide with the recording material, it is possible to form a mat layer having a suitable convex shape and strongly fixed to the recording material.

According to the present invention, a nozzle having a moisturizing body flow supply hole arranged in a non-round shape whose shape is set according to the width range of the recording material is installed on the outer periphery of the atomizing section and at the rear, By changing the phase with respect to the recording material at any time according to the width of the recording material, a mat can be formed with a uniform distribution on the recording material whose width changes continuously, and the atomization flow according to the width of the recording material. Since it can be regulated, it is possible to prevent scattering around.

In the atomizing device of the present invention, the moisturizing body flow supply hole is provided so as to recede from the opening end of the rotary atomizing section and opens in the atomizing flow direction, so that the moisturizing body flow is supplied in the atomizing flow direction. You can do it. Further, preferably, a moisture retaining body flow supply hole is provided in the nozzle, the supply hole is centered on the rotation axis of the rotary atomization unit, and the distance from the center is equal to or more than the opening end of the rotary atomization unit. When it is arranged on the circumference of, the moisturizing body flow is supplied to the outer peripheral side of the atomized flow emitted from the opening end, and the maximum radial direction of the atomized flow can be specified, By appropriately changing the phase by means of the above, the atomized flow of the recording material in the width direction can be regulated.

Therefore, the rotary atomizing apparatus of the present invention prevents the liquid particles constituting the atomized flow from drying and, even for a recording material whose width changes continuously, the outer periphery of the recording material of the liquid particles is larger than that of the recording material. The scattering to the side can be regulated and the surrounding area is not polluted.
Further, the flying speed of the liquid particles in the atomizing flow direction can be increased so that the liquid particles can collide with the recording material.

The atomizing flow for matting the recording material is
Generally, it is composed of liquid particles containing a matting agent for matting a recording material, and the liquid particles can be obtained by atomizing a liquid containing the matting agent with various atomizing devices.

Any matting agent may be used as long as it can make the recording material matte, and the below-mentioned resin or the like is preferably used.

The liquid containing the matting agent can be obtained by dissolving or dispersing the matting agent in a solvent.

The humidity of the moisturizing body flow is preferably adjusted to 35% or more, and usually up to about 70%. If it is less than 35%, the liquid particles are dried during flight and are easily attached to the recording material in a spherical shape and easily fall off. On the other hand, if it exceeds 70%, current is leaked when the atomized flow is charged, which is not preferable.

The rotary atomizer of the present invention is suitable for the method of matting the recording material of the present invention.

The rotary atomizing section is composed of a bell-shaped or cup-shaped rotating body having a large-diameter portion as an opening end, and rotates about the rotation axis of this rotating body. When the liquid containing the matting agent is supplied to the inner peripheral surface of the small diameter part, the liquid is spread as a thin film on the inner peripheral surface of the rotating body due to the centrifugal force due to the rotation, and the mist in the opening direction from the opening end of the large diameter part. It is released as a chemical stream.

The rotation speed of the rotary atomizer is preferably 800.
0 to 25,000 rpm. The supply amount of the matting agent-containing liquid may be, for example, 5 to 300 cc / min.

In addition, the rotary atomizer section has -40 to -120 kV.
May be supplied to charge the atomized stream.

A suitable shape and arrangement of the moisture retaining body flow supply hole will be described with reference to FIGS.

2 and 3 are views showing an example of the rotary atomizer of the present invention. 4 to 7 show the opening end 1 of the rotary atomizer.
It is a figure which shows the gas ejection part of the air nozzle whose shape seen from the 2 side is a non-round shape. Y is the major axis direction of the air nozzle, and Z is the minor axis direction of the air nozzle.

The atomizing device 4 having a substantially cylindrical shape includes a rotary bell 10A which is a rotary atomizing section, a cylindrical driving section 10B which is connected to a small diameter section of the rotary bell and rotates the rotary bell, and the driving section. The non-round air nozzle 8 is mounted on the outer peripheral surface of the cylinder so as to be centered on the rotation axis of the rotary bell.
The drive unit 10B has a rotation shaft that rotates the rotary bell 10A, but the drive unit itself does not need to rotate.

The rotating bell rotates about its rotation axis X and discharges the atomized flow 13 from the opening end 12 in the opening direction.

The air nozzle 8 has a plurality of gas ejection holes 9. These gas ejection holes open in the atomization flow direction and supply the moisture retaining body flow to the outer peripheral side of the opening end 12 in parallel with the rotation axis of the rotary atomization unit.

The gas ejection hole is centered on the rotation axis X,
It is arranged on the circumference of a non-perfect circle, and for example, as shown in FIG. 3, the gas ejection holes can be discontinuously provided on one ellipse in the shape of an elliptic circle. Further, as shown in FIG. 4, the gas ejection holes may be discontinuously arranged on the concentric elliptic circle. Further, as shown in FIG. 5, the gas ejection holes may be discontinuously arranged on the sides of the polygon.

The diameter of the gas ejection holes is preferably 0.1 to
It is 3 mm, more preferably 0.3 to 1.0 mm, and the hole diameters do not necessarily have to be the same.

The gas ejection holes can be slits. For example, as shown in FIG. 6, elliptical ring-shaped slits 11A that are continuous in the circumferential direction with the rotation axis of the rotary atomizer as the center can be formed, and the ring-shaped slits are two or more on a concentric elliptic circle. Can be provided. Alternatively, the slit may have a polygonal side shape. The width of the slit is preferably 0.1 to 2 mm. When two or more ring-shaped slits are provided on a concentric ellipse, the slit spacing is arbitrary, but is preferably 3 to 10 mm. The slit clearance does not necessarily have to be constant.

Further, as shown in FIG. 7, the gas ejection holes are formed by radiating a rectangular slit 11B whose lengthwise direction intersects an elliptic circle or polygonal side centering on the rotation axis or a polygonal side, or conforming thereto. It can be provided in a shape.
The rectangular slit preferably has a clearance of 0.
The length is 1 to 2 mm and the length is 2 to 20 mm.

The gas ejected from the gas ejection holes may be air, but when the liquid particles contain a large amount of solvent, nitrogen gas or the like may be used.

The rate at which the gas flows out from the gas ejection holes is
It is appropriately set depending on the shape and structure of the rotary atomizer and the distance to the recording material, and is preferably 3 to 30 m / sec. Thirty
When it exceeds m / sec, the speed at which the liquid particles collide with the recording material becomes too high, so that the matting agent tends to be formed flat. Further, in the case of less than 3 m / sec, the effect is often unclear.

An example of the matting method of the present invention will be described with reference to FIG.

After the temperature of the long recording material 1 which is guided and run by the pass rollers 3 and 6 is adjusted in the temperature adjusting chamber 2, in the coating booth 7, the liquid particles containing the matting agent are atomized by the atomizing device 4A. 4B, front and back surface 1A, 1B
Attached to. The atomizing devices 4A and 4B are the same as those shown in FIG. 2 and have the gas ejection holes 9 for ejecting the above-mentioned moisturizing body flow, so that the moisturizing body is provided on the outer peripheral side of the atomizing flow and in the atomizing flow direction. Supply the flow. When the width of the recording material changes continuously, the matting agent can be efficiently attached to the surface of the recording material by appropriately changing the phase of the gas ejection holes 9 with respect to the running direction of the recording material according to the width of the recording material. You can The recording material is then dried in the drying chamber 5. Minute protrusions of a suitable convex matting agent are strongly fixed and formed on the front surface and the back surface of the recording material after drying. Even if the width of the recording material changes continuously, the scattering of liquid particles can be suppressed efficiently, so that the coating booth does not become dirty.

The recording material in the present invention is basically a recording layer provided on a support, and the recording layer may be a photographic photosensitive layer, a magnetic recording layer or other various recording layers. There are various types depending on the purpose and use.
For example, as a recording material having a photographic light-sensitive layer, there are many general photographic light-sensitive materials, micro-photosensitive light-sensitive materials, radiation-sensitive materials, printing photographic light-sensitive materials, scientific photographic light-sensitive materials, photographic papers, heat-developable light-sensitive materials, etc. There are examples, and there can be enormous examples such as a laser recording material sensitive to a laser beam, a magnetic recording tape having a magnetic recording layer, and a magnetic recording film. As will be described later, since the fundamental idea of the technical idea of the present invention is to provide a fine mat on the surface of the object, the recording material is specifically specified as a useful object. Of course, it doesn't matter. In other words, providing a fine mat can cover the surface of any material,
By applying the present invention, it can be said that the most effective example of the object is a recording material, so the object of the present invention is limited to the recording material,
It clarifies the invention.

The support in the recording material of the present invention has a dimensionally stable surface, and in the case of a light-sensitive material, the support is preferably in the form of a sheet or a sheet because of its convenience in handling. In the case of a plate-shaped magnetic recording material, a tape-shaped or sheet-shaped magnetic recording material is selected, and a preferable one is selected depending on the practical use of the recording material or the equipment used. The material of the support is paper, for example, paper laminated with heat-melting plastic such as polyethylene, polypropylene, polystyrene, aluminum, various aluminum alloys, metal plates such as zinc, iron, copper, or diacetic acid. Cellulose, cellulose acetate, cellulose acetate butyrate, cellulose triacetate, cellulose propionate, cellulose nitrate, polyethylene terephthalate,
Films of plastics such as polypropylene, polycarbonate, polyvinyl acetal, etc., and papers or plastic films coated with metal as described above by lamination or vapor deposition are included. The material of the support is also appropriately selected depending on the purpose and use of the recording material. As the recording layer of the recording material, for example, as a photosensitive layer of a photographic photosensitive material, a silver halide-gelatin emulsion photosensitive layer, a diazo resin photosensitive layer, a photosensitive resin photosensitive layer, and many other known layers are known. It is used as the light-sensitive layer of the photographic light-sensitive material of the present invention. The same applies to the case of laser recording materials and magnetic recording materials, and known structures may be used for other configurations, materials, manufacturing and processing of these recording materials, as well as respective recording processes and applications. I don't think you need a detailed explanation.

The present invention is a method of matting the front surface and / or the back surface of the above-mentioned recording material. Therefore, the coating liquid in which the resin is dissolved or dispersed on the desired surface is made into particles and the electric charges are applied to the particles to give a recording material. It is attached to the front surface and / or the back surface and then dried.

Such a coating liquid can be applied to the front surface or the back surface of the recording material in a desired size with a uniform distribution. Therefore, in the case of photographic light-sensitive materials, laser recording materials, etc., the resin of the coating liquid is, for example, Japanese Patent Application No.
Copolymers of acrylic acid esters with acrylic acid or methacrylic acid; styrene, acrylic acid esters, acrylic acid or methacrylic acid copolymers; acrylic acid esters, styrene, as described in US Pat. Copolymers of acrylonitrile and the like with acrylic acid or methacrylic acid, maleic acid, itaconic acid and the like; vinyl-based polymers such as polyvinyl alcohol, polyvinyl acetate, polyvinylpyrrolidone and the like, and these resins are appropriately selected by a conventionally known method. To dissolve it in water or disperse it into an aqueous solution. The solvent may include water and an organic solvent. Further, it may contain a filler such as a powder of another water-soluble substance or a powder of a polymer, which does not affect the photosensitive layer or the adhered droplets. As an example of a method for preparing a coating liquid, for example, the above-mentioned copolymer is a polymerization initiator such as potassium persulfate obtained by emulsifying a raw material monomer in water with a surfactant in the same manner as in a usual latex synthesis method. It may be an aqueous dispersion emulsion-polymerized using
Further, a part of acrylic acid, methacrylic acid, maleic acid, itaconic acid or the like may be used as an aqueous solution of the copolymer as sodium salt, potassium salt or ammonium salt.

The resin concentration in the coating liquid is preferably about 5 to 50% by weight.

The above-mentioned coating liquid can usually be made into liquid particles having a desired size in the step or apparatus for depositing the droplets.

[0078]

EXAMPLES Both sides of an aluminum plate having a thickness of 0.24 mm were grained with a nylon brush and a 400 mesh pumicetone-water suspension and thoroughly washed with water. The plate was dipped in a 70 ° C. sodium phosphate aqueous solution (5%) for 3 minutes, washed with water and dried. To this support
20 parts by weight of 1 part by weight of naphthoquinone-1,2-diazide-5-sulfonate of polyhydroxyphenyl obtained by polycondensation of acetone and pyrogallol described in JP-A-28403 and 2 parts by weight of novolac type phenol formaldehyde resin. Part of 2-methoxyethyl acetate and 20 parts by weight of methyl ethyl ketone were dissolved to prepare a photosensitive solution, which was successively coated and dried on each side of the support to prepare a double-sided photosensitive lithographic printing plate. The printing plate prepared in this way is 400 mm wide x 100 mm long
m, width 600 mm × length 100 m, cut into 2 rolls, and samples A1, A2, samples B1, B
It was set to 2.

The mattization of the surface of each of these samples was carried out by adding methyl methacrylate / ethyl acrylate / sodium acrylate (weight ratio 68:20:12 (charge ratio)) copolymer polymer aqueous solution from both sides to obtain a solid concentration of 10 % And applied through a coating chamber as shown in FIG. 1 using a rotary atomizer as shown in FIG. At this time, for the samples A1 and B1, the moisture retaining body flow was ejected from the gas ejection holes. Also,
For A1, the nozzle angle was set so that the major axis direction of the air nozzle and the traveling direction of the printing plate were equal, and for B1, the nozzle angle was set so that the minor axis direction of the air nozzle and the traveling direction of the printing plate were equal. . Samples A2 and B2 were the same as A1 and B1, respectively, except that the gas flow was not ejected from the gas ejection holes.

The spouted gas has a humidity of 25 degrees and 55 degrees.
% Air.

The time from application to drying of each sample was about 2 seconds, and the drying was carried out by passing it through an atmosphere of a temperature of 60 ° C. and a humidity of 10% for about 5 seconds. Moreover, the coating amount of the mat after drying of each sample is 0.02 g / A1 and B1 sample.
The distribution of m / m ² was about 20 / mm ² , and the height of the mat was about 8 to 12 μm and the diameter was about 30 to 70 μm. No spherical particles were attached and the mat was uniformly distributed in the width direction. Further, there was no scattering outside the width of each printing plate of A1 and B1.

Samples A2 and B2 had a coating amount of 0.018 g / m ² and had a distribution of about 18 pcs / mm ² .
Adhesion of spherical particles having a diameter of the mat of about 20 to 50 μm was observed in many cases. Further, the matting agent was scattered outside the width of A2 and B2.

[0083]

【The invention's effect】

The method for matting a recording material of the present invention is directed toward the direction of the atomization flow by the moisturizing body flow supplied on the outer peripheral side of the atomization flow for matting the recording material and in the direction of the atomization flow.
And the cross section in the right angle direction is regulated to a non-round shape
In the cross section, the angle formed by the maximum radial direction of the atomization flow cross section with respect to the recording material width direction is set according to the width of the recording material,
Since the step of attaching the atomized flow to the recording material is included, the atomized stream can be attached to the recording material easily in response to the change in the width of the recording material.

The moisturizing body flow supplied on the outer peripheral side of the atomized flow and in the direction of the atomized flow prevents the atomized flow from drying and scattering, and increases the velocity of the atomized flow to increase the recording material. It is possible to form minute projections of the matting agent that are strongly adhered to.

The rotary atomizer of the present invention comprises a bell-shaped or cup-shaped rotary member having a large diameter portion as an opening end, and a rotary atomizer rotating about the rotation axis of the rotary member, and the rotary atomizer. And a drive part for rotating the atomizing part, and a moisturizing body flow supply hole which is provided receding from the opening end and opens in the atomization flow direction, and the moisturizing body flow supply hole surrounds the rotation shaft and the opening. The moisturizing body flow supply hole, which is annularly arranged on the circumference of a non-true circle having a diameter equal to or larger than the end, and which defines the maximum diameter of the ring,
Since it is movable in the circumferential direction of the ring, it is possible to define the maximum radial direction in the cross section of the atomization flow generated from the rotary atomization unit, and easily change the maximum radial direction of the atomization flow cross section. Can be made.

Therefore, in the rotary atomizer of the present invention, the angle formed by the maximum radial direction of the atomization flow cross section in the cross section of the atomization flow with respect to the recording material width direction is easily set according to the width of the recording material. Since the atomized flow can be attached to the recording material, it can be suitably used in the matting method of the recording material of the present invention.

[Brief description of drawings]

FIG. 1 is a schematic side view (view seen from the width direction of a recording material) showing an example of steps of a method for matting a recording material of the present invention.

FIG. 2 is a side view showing an example of the rotary atomizing device of the present invention (a view seen from a direction parallel to the rotation axis of the device).

FIG. 3 is a front view showing an example of the rotary atomizing device of the present invention (a view seen from the rotation axis direction of the device).

FIG. 4 is a view showing an elliptical gas jetting part viewed from the opening end side of the rotary atomizer.

FIG. 5 is a view showing a polygonal gas ejection portion as viewed from the opening end side of the rotary atomizer.

FIG. 6 is a view showing an elliptical gas ejection portion as viewed from the opening end side of the rotary atomizer.

FIG. 7 is a view showing an elliptical gas jetting part viewed from the opening end side of the rotary atomizer.

[Explanation of symbols]

1 ... Recording material 2 Temperature control room 3 ... pass roller 4A, 4B ... Atomizing device 5 ... Drying room 6 ... Pass roller 7 ... Painting booth 8 ... Air nozzle 9 ... Gas ejection holes 10A ... Rotating bell 10B ... Drive unit 11A, 11B ... Gas ejection slit

Claims (3)

(57) [Claims] 1. A moisture-retaining body flow supplied in the outer peripheral side of the atomization flow for matting the recording material and in the direction of the atomization flow ,
In the cross section of the atomized flow in which the cross section perpendicular to the atomized flow direction is restricted to a non-round shape, the maximum radial direction of the atomized flow cross section in the cross direction of the recording material is set. A method of matting a recording material, comprising the step of setting an angle according to the width of the recording material and adhering the atomized flow to the recording material. 2. An opening in the direction of the atomization flow,
The moisture retaining body flow is supplied from the moisture retaining body flow supply hole arranged on the circumference of the non-round circle around the shaft, and the moisture retaining body flow supply hole is supplied.
The method for matting a recording material according to claim 1, wherein the angle is set according to the width of the recording material by moving around the axis in the atomizing flow direction. 3. A rotary atomizing unit which is composed of a bell-shaped or cup-shaped rotating body having a large diameter portion as an opening end and which rotates around a rotation axis of the rotating body, and a drive unit which rotates the rotary atomizing unit. And a moisturizing body flow supply hole which is provided receding from the opening end and opens in the atomization flow direction, the moisturizing body flow supply hole enclosing the rotation shaft and having a diameter equal to or larger than the opening end . The rotary atomizer, wherein the moisturizing body flow supply hole, which is annularly arranged on the circumference of a non-round circle and defines the maximum diameter of the ring, is movable in the circumferential direction of the ring.