JPH03293131A - Manufacturing device of cylindrical printing plate material - Google Patents

Abstract

PURPOSE:To make possible the secure closing of a joint between both ends by filling a space formed by an area between the ends of a printing plate and a pressure attachable sheet with a thermally plastic and/or curable material, then allowing the material to be hardened or cured and disengaging the pressure attachable sheet. CONSTITUTION:An engagement part 15 on one end of a pressure attachable sheet 14 is securely fixed to an engagement part 11 of a pressure attachable engagement device 11 in a state that a plate cylinder 1 is engaged in such a manner that a gap 6 is allowed to be positioned at the front. After that, a following intermediate part is allowed to engage tightly with a guide member 10, the periphery of a cylinder including an area between the ends of a printing plate and the guide member 10 sequentially. In addition, an engagement part on the other end of the pressure attachable sheet engagement device 11 is securely engaged with the engagement part 13. Consequently, the pressure attachable sheet can be tightly joined to the gap 6 under pressure. Next the space formed by an area between the ends of the printing plate and the pressure attachable sheet is filled, in such a state, with a thermally plastic material or a thermally curable material or both materials from above. Then after the filler is hardened or cured, the pressure attachable sheet is removed. As a result, the secure closing of the gap between the ends of a photosensitive resin printing plate is ensured.

Description

Detailed Description of the Invention [Industrial Application Field] The present invention relates to an apparatus for manufacturing a cylindrical printing plate material, and more specifically to a photosensitive resin printing device wrapped around a plate cylinder of a rotary gravure printing machine. This invention relates to a device for closing the gap between the edges of a plate.

[Prior Art] In order to print a continuous pattern, a seamless printing plate material is required. Known examples of such printing materials include those in which a continuous pattern is hand-engraved on a cylinder wrapped with rubber to a certain thickness, and gravure plates in which a continuous pattern is etched into a metal cylinder. However, the production of these printing plates has low productivity and requires skill.

In order to overcome these problems, attempts have been made to wrap a plate-shaped photosensitive resin plate material around the plate cylinder of a rotary gravure printing machine. The problem is how to deal with the gaps that occur between the edges of the plate material. If there is a gap, ink will get in, and this ink will be transferred to the printed material, causing stains. As a way to prevent this problem, we have changed to an offset method in which the ink is transferred from the printing plate onto a blanket, and then transferred to the printed material, and by cutting out the blanket in the area corresponding to the seam, the ink that has entered the gap is transferred to the printed material. Methods to prevent this from occurring are being considered. However, this method requires a complicated printing machine and requires replacing the blanket for each pattern, making it difficult to be widely used.

On the other hand, JP-A-59-169863 proposes a method in which a flat piece is placed over the gap in the end section of a gravure printing plate, and the resulting gap is filled with a thermoplastic and/or curable material to close the gap. has been done. This method includes a pressing piece that supports a flat piece and a pressing device for pressing down the pressing piece, and the pressing device and pressing piece press the flat piece between the ends of the plate-like plate material. However, the equipment is large-scale and expensive.

[Problems to be Solved by the Invention] The present invention has been devised in view of the various drawbacks of the prior art, and its purpose is to provide a simple and inexpensive structure, and also to provide a method that allows both ends of a printing plate to be easily removed. An object of the present invention is to provide an apparatus for manufacturing a cylindrical printing plate material, which can reliably close the seams of the printing plate while maintaining good surface quality.

[Means to solve the problem] This object of the present invention is achieved by the following configuration.

1. A substrate, a plate cylinder on which a photosensitive resin printing plate is removably installed at a predetermined position on the substrate, and is wrapped around the circumferential surface with a gap at the end, and a plate cylinder on both sides of the plate cylinder. At least a pair of guide members erected on a substrate parallel to the plate cylinder axis; and at least a pair of pressure-bonding sheets erected parallel to the plate cylinder axis on the substrate on both sides rear of the plate cylinder. A locking device, one end side of which is removably engaged with one of the pressure sheet locking devices, and a subsequent intermediate side of the one guide member, the plate cylinder outer periphery including the end section of the printing plate, and A crimping sheet is provided that is removably stretched over the other guide member, and further includes a crimping sheet that is removably engageable with the other crimping sheet locking device on the other end side that follows this, and the crimping sheet and the plate are connected to each other. The cylinder is configured so that, when the pressure bonding sheet is maintained in a tensioned state and stretched, it is closely pressed and engaged with the outer circumference of the cylinder including the end section of the printing plate. A cylinder characterized in that the space formed between the edges of the printing plate and the pressure sheet is filled with a thermoplastic and/or curable material, and the pressure sheet is disengaged after the filling material has solidified or hardened. Manufacturing equipment for printing plate materials.

The details of the present invention will be explained below with reference to the drawings.

FIG. 1 is a schematic plan view showing an example of a manufacturing apparatus according to the present invention, and FIG. 2 is a partially sectional front view of FIG. 3 is a partially enlarged view of FIG. 1, and FIG. 4 is a plan view showing a state in which a printing plate is wound around a plate cylinder.

In the figure, reference numeral 1 denotes a printing cylinder, which, as shown in Fig. 4, consists of a cylinder shaft 2 and a cylinder body 3 that is detachably fitted onto the cylinder shaft 2. A groove 4 extending along the axis and formed from the surface of the form cylinder towards the center is provided, in which the two folded ends of the printing form 5 wound onto the form cylinder 1 are placed. is attached. 6 is a gap formed between the ends. 7 is a setting hole provided along the axis of the cylinder shaft 2, and the cylinder shaft 2 is fixed at a predetermined position near the front of the center of the metal substrate 8, as shown in FIGS. 1 and 2. After the cylinder body 3 is fixed upright with screws 9, the cylinder body 3 is fitted onto the cylinder body 3 for use.

Reference numeral 10.10 denotes a pair of guide members respectively erected at predetermined positions on the plate cylinder axis, and in the illustrated example, each guide member extends parallel to the plate cylinder axis 2 and is provided facing each other. It consists of a pair of elongated guide rolls, each of which is removably erected on the substrate 8 via a fixing screw 9.

1.1. ．． 1.1 is a pair of crimping joints, which are erected at predetermined positions on the base plate 8 behind both sides of the plate cylinder 1, facing each other and parallel to the plate cylinder axis 2, and having approximately the same length as the plate cylinder axis. In the illustrated example, as shown in an enlarged view in FIG. 3, the sheet locking device has a locking frame 12 erected behind the plate cylinder, which has a locking frame 12 at both ends having approximately the same length as the plate cylinder. Hook-shaped engaging portions 13.13 extending parallel to the cylinder axis are provided facing each other, and the engaging portions 13.13 are provided with engaging portions 15.13 provided at both ends of the pressure bonding sheet 14. 15 can be removably engaged with each other.

Reference numeral 14 denotes a rectangular crimp sheet made of an elastic material or the like, having a predetermined width equal to or longer than the length of the groove 4 and a predetermined length, one end of which is connected to one engaging portion of the crimp sheet locking device. 13 has an engaging part 15 that can be detachably engaged with the engaging part 15, and the intermediate side that follows this is successively stretched over the one guide member 9, the outer peripheral part of the plate cylinder 1, and the other guide member 9, Further, at the other end following this, an engaging part 15 is formed which can be detachably engaged with the other engaging part 13 of the pressure-bonding sheet locking device.

Now, in such a device, with the plate cylinder 1 locked so that the gap 6 thereof is positioned at the front as shown in FIG. After being engaged and fixed to the engaging portion 13 of the locking device 11, the subsequent intermediate portion is tightly and tightly engaged with the guide member 10, the outer peripheral portion of the cylinder including the end section 6 of the printing plate, and the guide member 10 in order. After tightening, engage part 1 at the other end of the pressure bonding sheet.
By engaging and fixing the crimping sheet 5 to the engaging portion 13 of the other crimping sheet locking device 1, 1, the crimping sheet can be securely and closely pressed into the gap 6 as shown in FIG. .

Then, in this state, a thermoplastic material, a curable material, or both materials are filled from above into the space formed between the edges of the printing plate and the pressure bonding sheet, and after the filler solidifies or hardens, the pressure bonding sheet is applied. Removal ensures that the seams at both ends of the printing plate are closed while maintaining good surface quality.

It goes without saying that the length of the pressure bonding sheet 14 is selected within a range such that when the pressure bonding sheet is stretched and fixed as described above, it can reliably cover the upper surface of the gap 6. . Further, in the above example, the engaging portion of the pressure bonding sheet locking device is provided at a fixed position, but of course, the engaging portion 13 on the locking frame 11 is placed at a predetermined interval, for example, in the front and rear. A plurality of pressure bonding sheets 14 are provided in the gap 6, and the engagement position is changed as necessary to finely adjust the engagement state of the pressure bonding sheet 14 to the gap 6, so that the pressure bonding sheet 14 can be reliably maintained in a tensioned state. You can also do this.

Further, the number of guide members is not necessarily limited to one pair, but the number of guide members can be increased as appropriate. Also,
It goes without saying that the installation position of the guide member can be changed and adjusted as appropriate without impairing the object of the present invention.

Furthermore, in the apparatus shown in FIG. 1, an example has been described in which the plate cylinder is erected and fixed at a predetermined position on the front side of the substrate, but of course the scope is not limited to this, and for example, the plate cylinder can be driven by driving its cylinder axis appropriately. It is configured to be able to move forward and backward in the front and back direction, that is, in the direction perpendicular to the cylinder axis, by means such as an air cylinder, and when the cylinder axis is stopped at the retreated position, the circumferential surface of the plate cylinder engages with the stretched pressure sheet. It is also possible to configure the plate cylinder so that there is no contact, move the plate cylinder forward from that state, and stop the plate cylinder at a position where the outer circumferential portion of the cylinder is closely pressed and engaged with the pressure bonding sheet.

It goes without saying that the structure, shape, etc. can be changed as appropriate without impairing the purpose of the present invention.

Examples of the material for the plate cylinder of the present invention include steel, aluminum, copper, etc. In addition to metal cylinders,
It is also possible to use a plastic or metal cylinder with a layer of plastic or rubber on the outside.

All known photosensitive resin plate materials can be used to be wound around the above plate cylinder, such as polyamide, polyester, polyvinyl alcohol, partially saponified polyvinyl acetate, cellulose such as cellulose acetate, NBR, etc.
Photosensitive resins made by blending photopolymerizable unsaturated compounds with polymers selected from the group consisting of synthetic rubbers, etc.; photosensitive resins whose main component is unsaturated polymers such as unsaturated polyesters and unsaturated polyurethanes; These include diazo photosensitive resins such as a condensate of salt and formalin, and photosensitive resins having a cinnamoyl group such as polyvinyl cinnamate.

In order to make these photosensitive resins into plate materials, the above photosensitive resin composition is cast onto a metal substrate such as steel, aluminum, or copper, or a plastic substrate such as polyethylene terephthalate film. This is common. However, it is also possible to use the photosensitive resin sheet itself, which is not lined with such a substrate, wrapped around a cylinder.

Materials for the pressure bonding sheet used in the present invention include natural rubber, synthetic rubber, such as silicone rubber, polyisoprene rubber, polybutadiene rubber, styrene-butadiene rubber, nitrile rubber, acrylic rubber, butyl rubber, epichlorohydrin rubber, urethane rubber, Examples include polyester elastomer and polyamide elastomer. Other examples include elastically deformable plastic sheets, such as polyethylene sheets and soft vinyl chloride sheets. The thickness of the pressure bonding sheet is usually 0.01 to IQ mm, preferably 0.1 to 8 mm, and preferably transparent. By making it transparent, it becomes easy to monitor the process of filling the gap with the filler material and the degree of sealing between the pressure-bonding sheet and the supporting surface of the pressure-bonding sheet.

Thermoplastic and/or curable materials are used as filling materials. Typical thermoplastic resins include polyethylene, polypropylene, polyethylene terephthalate, polybutylene terephthalate, and 2-polyamide. As the curable material, thermosetting resins such as epoxy and melamine, resins that are cured by heat or light such as unsaturated polyester, and inorganic curable materials such as cement are also possible. As a photocurable material, it is also suitable to use a photosensitive composition used in a photosensitive resin plate material as a filler.

In order to achieve better adhesion of the filler material, it is also possible to apply an adhesive to the end faces of the printing plate beforehand.

A plate-shaped photosensitive resin plate material can be exposed and developed as a plate, and after plate making is completed, it can be wrapped around a cylinder and the seams can be treated by the method of the present invention, or an unexposed plate can be used. It is also possible to wrap the material around a cylinder, process the joints using the method of the present invention, and then expose and develop the material in the cylindrical shape. In the case of a continuous pattern, it is advantageous to wrap an unexposed plate material around a cylinder, then fill the gap with the same photosensitive resin as the plate material using the method of the present invention, and then expose and develop the cylindrical plate as it is.

3. Curing or solidification of the filler, in the case of thermoplastic materials, can be done by cooling; in the case of curable materials, it is possible to cure or solidify the filler by providing the necessary conditions for curing the filler, such as heat, actinic rays, moisture, and catalysts. This is achieved by

[Examples] The present invention will be explained in more detail below using Examples.

Example 1 As a printing plate material, five photosensitive resin layers consisting of alcohol-soluble polyamide, a photopolymerizable unsaturated monomer, and a photosensitizer were formed on a polyethylene terephthalate substrate with a thickness of 450 μm.
The one provided with a thickness of 0μ was selected. A patterned positive film was vacuum-adhered onto this plate material and exposed to ultraviolet light from a chemical lamp for 2 minutes. Then ethanol/water = 8
Development was carried out using a brush-type washing machine containing a developing solution of 5/15 (weight ratio) to obtain a plate-shaped printing plate in which concave portions corresponding to the image were formed.

This printing plate was attached with an adhesive onto a steel cylinder body having a diameter of 100 mm and a width of 105 mm.

4 A gap of approximately 2 mm was generated between the edges of the plate material.

As a pressure bonding sheet, the thickness is 2mm and the length is 400mm.

A silicone rubber one with a width of 110 mm was used. Insert the above-mentioned cylinder body into the cylinder shaft of the device shown in Fig. 1, then engage and fix one of the engaging parts of the crimping sheet to one of the connecting parts of the locking device, and then move it along the guide member on both sides of the gap. The sheet was pressed tightly so as to straddle the plate material, and further along the guide member, the other engaging portion of the pressure bonding sheet was engaged and fixed to the other engaging portion of the locking device. The stretched length of the crimped sheet at this time is 45
It is 0mm. An epoxy resin with a viscosity of 50 centipoise and a low-temperature curing catalyst added was injected into the gap formed between the plate cylinder, the end face of the plate material, and the pressure-bonding sheet using a microsyringe, and was heated at 50° C. for 2 hours to complete curing. When the pressure bonding sheet was then removed, a uniform surface of cured epoxy resin was formed between the edges of the plate material.

When a gravure printing test was conducted using this plate material, it was found that no troubles due to seams occurred at all. It was confirmed that there was no effect of seams5 on the printed matter.

Example 2 As a plate-like photosensitive resin plate material, a photosensitive resin layer consisting of partially saponified polyvinyl acetate, a photopolymerizable monomer, diethylene glycol, and a photosensitizer was placed on a steel substrate of 200 μm thick to a thickness of 800 μm. I chose the one provided. A positive film with a predetermined pattern was vacuum-adhered onto this plate-like plate material, and exposed for 1 minute using an ultra-high pressure mercury lamp. Next, the intaglio material backed with the steel substrate was obtained by developing for 1 minute in a spray washing machine containing neutral water.

This intaglio material was molded into a nearly cylindrical shape by carping, and then attached to a magnetic cylinder with a diameter of 100 mm and a width of 105 mm. At that time, approximately 3 m long on both ends of the plate material.
A gap of m was generated.

The same pressure bonding sheet as in Example 1 was pressed and brought into close contact with the plate materials at both ends of the gap using the same device and the same method.

Next, a photopolymerizable unsaturated polyester resin having a viscosity of 150 centivoids was injected into the gap formed between the cylinder, the end surface of the plate material, and the pressure-bonding sheet using a microsyringe. Then, through a transparent pressure bonding sheet,
After photo-curing by irradiating ultraviolet rays from a chemical lamp for 4 minutes, the pressure bonding sheet was removed.

The cylindrical intaglio material with seams treated in this way was set in a gravure printing machine and a printing test was conducted. As a result, it was confirmed that printing was possible without any particular problems.

Example 3 A plate material was selected in which a photosensitive resin layer consisting of polyetheramide, a photopolymerizable monomer, and a photosensitizer was laminated to a thickness of 350 microns on an aluminum sheet having a thickness of 150 microns.

Next, a groove with a width of 5 mm and a depth of 10 mm was created on the surface of an aluminum cylinder with a diameter of 100 mm and a width of 105 mm parallel to the central axis of the cylinder.

It was attached using double-sided adhesive tape so that the gap matched the groove made on the cylinder surface.

The same pressure bonding sheet as in Example 1 was pressed and brought into close contact with the plate materials at both ends of the gap using the same device and the same method.

Next, the same photosensitive resin used for the plate material was injected in a molten state at 100° C. into the gap formed between the groove on the cylinder, the edge of the plate material, and the pressure sheet using a small gear pump. At this time, the cylinder was also heated to 100°C. After the injection was completed, the pressure-bonding sheet was removed after cooling and confirming that the injected photosensitive resin had solidified. In this way, a seamless cylindrical unexposed plate material was obtained.

Next, a negative film with a predetermined pattern was wrapped around this cylindrical plate material, and exposed to a chemical lamp for 3 minutes while rotating. Thereafter, the unexposed areas were removed using a rotating brush washer containing neutral water to obtain a relief image on the cylinder.

The image was reproduced at the joint with no difference from other parts.

After drying the plate material, the joint portion was exposed to light for 5 minutes using an ultra-high pressure mercury lamp to fully photocure the photosensitive resin at the bottom of the groove.

The obtained cylindrical plate material was installed in a letterpress printing machine for sheet printing, and a printing test was performed. As a result, the print was not affected by the seam at all, and a print with a good continuous pattern was obtained.

8 [Effects of the Invention] Since the present invention is constructed as described above, the apparatus itself is simple and inexpensive, and moreover, the gap between the ends of a photosensitive resin printing plate wrapped around a plate cylinder can be reduced with simple operation. It has remarkable practical effects, such as being able to reliably bind while maintaining good surface quality.

[Brief explanation of drawings]

FIG. 1 is a schematic plan view showing one example of the device according to the present invention, and FIG. 2 is a partially sectional front view of FIG. 1 taken along the arrow A-A'.
FIG. 3 is a partially enlarged view of FIG. 1, and FIG. 4 is a plan view showing the printing plate wrapped around the plate cylinder. 1: Plate cylinder, 2 cylinder shaft 3 cylinder body, 4: groove, 5: printing plate, 6: gap, 8
: Substrate, 10.10: Guide member, 11.11: Pressure sheet locking device, 12: Locking frame, 13.13: Engagement portion, 14: Pressure sheet 9 start - 0 15° 15: Engagement portion .

Claims (1)

[Claims] 1. A substrate, a plate cylinder which is removably installed at a predetermined position on the substrate and has a photosensitive resin printing plate wrapped around its circumferential surface with a gap at the end, and both sides of the plate cylinder. at least one pair of guide members erected parallel to the plate cylinder axis on the base plate; and at least one pair of crimping members erected parallel to the plate cylinder axis on the base plate on both sides rear of the plate cylinder. A sheet locking device, one end side of which is removably engaged with one of the pressure-bonded sheet locking devices, and a subsequent intermediate side of the plate cylinder outer periphery including the one guide member and the end section of the printing plate. and a crimping sheet that is removably stretched over the other guide member, and further includes a crimping sheet that is removably engageable with the other crimping sheet locking device on the other end side that follows the crimping sheet, and the crimping sheet and the The plate cylinder is configured such that when the pressure bonding sheet is maintained in a tensioned state and stretched, it is closely pressed and engaged with the outer circumference of the cylinder including the end section of the printing plate, The space formed between the edges of the printing plate and the pressure bonding sheet is filled with a thermoplastic and/or curable material, and the pressure bonding sheet is disengaged after the filling material has solidified or hardened. Equipment for manufacturing cylindrical printing plate materials.