JP2003094851A - Equipment and method for manufacturing lithographic printing plate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain equipment and a method for manufacturing a lithographic printing plate which can surely adhere a protective sheet material to the lithographic printing plate and besides enable stable manufacture of the lithographic printing plate, while preventing sparking. SOLUTION: After the water content of an interleaving paper web 26 is made to be 4.8% or below by an interleaving paper drying box 48, the web is subjected to static elimination by an interleaving paper static-eliminator 34 and adhered to an aluminum web 14. Before accumulation of the lithographic printing plate 12 by an accumulator 42, the water content of the interleaving paper is made to be 3.0% or above by a humidifying box 54. Since the upper limit value of the water content needed for electrostatic adhesion and the lower limit value of the water content for preventing sparking on the occasion of accumulation are controlled independently, the water content of the web 26 can be maintained at 3.0% or above even when the speed of carriage of the aluminum web 24 lowers, and sparking can be prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a planographic printing plate manufacturing apparatus and a planographic printing plate manufacturing method for adhering a protective sheet material to a planographic printing plate and then stacking the planographic printing plates.

[0002]

2. Description of the Related Art Platemaking methods in recent years (including electrophotographic platemaking methods)
In order to facilitate automation of the plate making process, lithographic printing plates such as photosensitive printing plates and heat-sensitive printing plates are widely used.
A lithographic printing plate is generally formed on a support such as a sheet-shaped or coil-shaped aluminum plate by, for example, graining, anodizing,
Surface treatment such as silicate treatment and other chemical conversion treatment is performed individually or in combination, and then, a photosensitive layer or a heat-sensitive layer (hereinafter, these are collectively referred to as "coating film", and the surface coated with the coating film is referred to as "image formation". Surface, the surface on which the coating film is not formed is referred to as a “non-image forming surface”, and then dried to be cut into a desired size. After manufacturing, if the coating film of the lithographic printing plate is damaged, it may affect the printed surface, so protective paper called interleaving paper may be attached to the coating film by electrostatic adhesion. is there. The manufactured planographic printing plates are stacked in the thickness direction by a stacking device to form a stack.

After removing the interleaving paper, the planographic printing plate is subjected to plate making processing such as exposure, development processing, gumming, etc., and is set in a printing machine to be coated with ink, whereby characters and images are printed on the paper surface. Etc. are printed.

By the way, when electrostatically bonding the interleaving paper to the planographic printing plate, it is preferable to reduce the water content of the interleaving paper in order to enhance the adhesive force.

On the other hand, if the water content of the interleaving paper is too low, sparks may occur during the stacking by the stacking device, and the quality of the planographic printing plate may be degraded.

For example, Japanese Patent Laid-Open No. 10-147466 discloses that
An invention has been disclosed in which by setting the water content of the interleaving paper in the range of 3.0 to 4.8%, it is possible to prevent inadvertent peeling of the interleaving paper from the planographic printing plate and prevent defective accumulation. . Further, it is considered that by setting the water content of the interleaving paper within this range, it is possible to prevent the occurrence of sparks during the accumulation.

However, since the water content of the interleaving paper is narrow in the above range, it is often difficult to control the water content in this range to maintain it constantly. In particular, for example, when the transportation speed of the lithographic printing plate suddenly decreases, it is difficult to follow this and reduce the capacity of the drying device, so that an excessively dried area is generated, which is a cause of sparking. Will be.

[0008]

SUMMARY OF THE INVENTION In consideration of the above facts, the present invention is capable of reliably adhering a protective sheet material to a lithographic printing plate, and furthermore, prevents the occurrence of sparks and allows stable lithographic printing. An object is to obtain a planographic printing plate manufacturing apparatus and a planographic printing plate manufacturing method capable of manufacturing a plate.

[0009]

According to a first aspect of the present invention, there is provided an adhesive device for electrostatically adhering a protective sheet material for protecting the planographic printing plate to a conveyed planographic printing plate, and the adhering device. A drying device for drying the protective sheet material before the electrostatic adhesion, a stacking device for stacking the planographic printing plates on which the protective sheet material is electrostatically bonded in the thickness direction, and the protective sheet by the bonding device. A static eliminator for static eliminating the protective sheet material after electrostatically adhering the material and before accumulating the planographic printing plate by the accumulating apparatus.

That is, in this planographic printing plate manufacturing apparatus,
The protective sheet material is electrostatically adhered to the lithographic printing plate in the conveyed state by an adhering device.
The protective sheet material is dried by a drying device. As a result, the electrostatic adhesive force of the protective sheet material can be increased and the protective sheet material can be strongly adhered to the planographic printing plate.

The lithographic printing plate to which the protective sheet material is adhered is
Although it is accumulated in the thickness direction by the accumulating device, the protective sheet material is destaticized by the destaticizing device after electrostatic adhesion and before the accumulation. Therefore, it is possible to prevent sparks from being accumulated. Moreover, since the generation of sparks is prevented by discharging the protective sheet material in this manner, it is not necessary to consider the lower limit value of the water content that can prevent the generation of sparks during drying in the drying device. Therefore, control of the drying device becomes easy. Further, for example, when the transportation speed of the lithographic printing plate and the interleaving paper decreases, the drying capacity of the drying device relatively increases,
Although the water content of the interleaving paper may decrease, even in such a case, since the protective sheet material is discharged before the lithographic printing plates are accumulated, sparks are prevented from being generated during the accumulation, and the lithographic printing plates can be stably maintained. It can be manufactured.

The charge eliminating device is not particularly limited as long as it is capable of eliminating charge to the extent that it is possible to prevent the generation of sparks during the accumulation of planographic printing plates.
As described above, if the humidifying device humidifies the protective sheet material, the protective sheet material can be discharged with a simple configuration.

According to a third aspect of the invention, in the second aspect of the invention, the moisture content of the protective sheet material by the drying device is set to 4.8% or less, and the protective sheet material by the humidifying device is set. The water content is set to 3.0% or more.

That is, by setting the water content of the protective sheet material by the drying device to 4.8% or less, a large electrostatic adhesive force is generated and the protective sheet material can be strongly adhered to the planographic printing plate. Become.

Further, by setting the water content of the protective sheet material by the humidifying device to 3.0% or more, it is possible to reliably prevent the generation of sparks during the lithographic printing plate accumulation.

In the invention according to claim 4, a drying step of drying the protective sheet material for protecting the lithographic printing plate, and the protective sheet material dried by the drying step are electrostatically adhered to the lithographic printing plate in a conveyed state. An adhesion step for removing the charge, a charge removal step for removing the charge of the protective sheet material electrostatically bonded to the planographic printing plate by the adhesive step, and a planographic printing plate for which the charge protection sheet material has been removed by the charge removing step is accumulated in the thickness direction. And an integration step.

That is, in this planographic printing plate manufacturing method,
The protective sheet material is electrostatically adhered to the lithographic printing plate in the conveyed state in the adhering step.
The protective sheet material is dried in the drying process. As a result, the electrostatic adhesive force of the protective sheet material can be increased and the protective sheet material can be strongly adhered to the planographic printing plate.

The lithographic printing plate to which the protective sheet material is adhered is
Although it is accumulated in the thickness direction in the accumulation step, the protective sheet material is neutralized in the static elimination step after electrostatic adhesion and before the accumulation. Therefore, it is possible to prevent sparks from being accumulated. Moreover, the static electricity is removed from the protective sheet material in this way to prevent the occurrence of sparks.
It is not necessary to consider the lower limit of water content that can prevent sparks. Therefore, the control in the drying process becomes easy.
Further, for example, when the transportation speed of the planographic printing plate and the slip sheet decreases, the drying capacity in the drying step relatively increases, and the water content of the slip sheet may decrease, but even in such a case Since the protective sheet material is discharged before the lithographic printing plates are accumulated, sparks are prevented from being generated during the accumulation, and the lithographic printing plates can be stably manufactured.

In the static elimination step, the specific method is not particularly limited as long as the static elimination can be carried out to the extent that the generation of sparks can be prevented during the accumulation of the planographic printing plate. For example, as described in claim 5, the protective sheet If the humidifying step of humidifying the material is performed, the protective sheet material can be discharged with a simple configuration.

In the invention according to claim 6, in the invention according to claim 5, the water content of the protective sheet material by the drying step is set to 4.8% or less, and the protective sheet material by the humidifying step is set. The water content is set to 3.0% or more.

That is, by setting the water content of the protective sheet in the drying step to 4.8% or less, a large electrostatic adhesive force is generated and the protective sheet material can be strongly adhered to the planographic printing plate. become.

Further, by setting the water content of the protective sheet material by the humidifying device to 3.0% or more, it is possible to reliably prevent the occurrence of sparks during lithographic printing plate accumulation.

[0023]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 partially shows a schematic configuration of a processing line 14 for a lithographic printing plate 12 equipped with a lithographic printing plate manufacturing apparatus according to an embodiment of the present invention.

The planographic printing plate 12 is a coating film (a photosensitive layer in the case of a photosensitive printing plate and a heat sensitive layer in the case of a thermosensitive printing plate) on a thin aluminum support formed in a rectangular plate shape. Further, if necessary, an overcoat layer, a mat layer, etc.) is applied to form the layer. Exposure to this coating film,
A plate-making process such as a development process and gumming is carried out, the plate is set in a printing machine, and ink is applied, so that characters, images, etc. are printed on the paper surface. The lithographic printing plate 12 manufactured by the lithographic printing plate manufacturing apparatus of the present embodiment is a stage before the processing (exposure, development, etc.) necessary for printing is performed, and in some cases, the lithographic printing plate precursor Alternatively, it is sometimes called a planographic printing plate material.

With such a constitution, the concrete constitution of the lithographic printing plate 12 is not particularly limited. For example, a lithographic printing plate for a laser printing plate of a heat mode system and a photon system can be used to obtain a digital image. A lithographic printing plate can be made directly from the data.

Further, the lithographic printing plate can be made into a lithographic printing plate corresponding to various plate making methods by selecting various components in the photosensitive layer or the heat sensitive layer. Examples of specific embodiments of the lithographic printing plate according to the present invention include the following (1) to
The aspect of (11) is mentioned. (1) A mode in which the photosensitive layer contains an infrared absorber, a compound that generates an acid by heat, and a compound that crosslinks by an acid. (2) A mode in which the photosensitive layer contains an infrared absorber and a compound that becomes alkali-soluble by heat. (3) A mode in which the photosensitive layer includes two layers, a layer containing a compound that generates radicals by laser irradiation, an alkali-soluble binder, and a polyfunctional monomer or prepolymer, and an oxygen barrier layer. (4) A mode in which the photosensitive layer comprises two layers of a physical development nucleus layer and a silver halide emulsion layer. (5) A mode in which the photosensitive layer includes three layers of a polymerized layer containing a polyfunctional monomer and a polyfunctional binder, a layer containing silver halide and a reducing agent, and an oxygen barrier layer. (6) A mode in which the photosensitive layer includes two layers, a layer containing a novolac resin and naphthoquinonediazide, and a layer containing silver halide. (7) A mode in which the photosensitive layer contains an organic photoconductor. (8) A mode in which the photosensitive layer includes two or three layers including a laser light absorption layer that is removed by laser light irradiation and a lipophilic layer and / or a hydrophilic layer. (9) A compound in which the photosensitive layer absorbs energy to generate an acid, a polymer compound having a functional group in the side chain to generate a sulfonic acid or a carboxylic acid by the acid, and an acid generator by absorbing visible light Embodiments containing a compound that gives energy to (10) A mode in which the photosensitive layer contains a quinonediazide compound and a novolac resin. (11) A mode in which the photosensitive layer contains a compound that decomposes by light or ultraviolet rays to form a cross-linked structure with itself or other molecules in the layer, and an alkali-soluble binder.

Particularly, in recent years, a lithographic printing plate coated with a high-sensitivity photosensitive type coating film exposed by a laser or a heat-sensitive lithographic printing plate may be used (for example, the above-mentioned (1) to (3). ), Etc.)).

The wavelength of the laser light here is not particularly limited, and for example, a laser having a wavelength range of 350 to 450 nm (a concrete example is a laser diode having a wavelength of 405 ± 5 nm). Laser in the wavelength range of 480 to 540 nm (specific examples include an argon laser having a wavelength of 488 nm and a wavelength of 532 nm).
nm (FD) YAG laser, wavelength 532 nm solid-state laser, wavelength 532 nm (green) He-Ne laser). A laser with a wavelength range of 630 to 680 nm (specifically, a He-Ne laser with a wavelength of 630 to 670 nm,
Red semiconductor laser having a wavelength of 630 to 670 nm). A laser having a wavelength range of 800 to 830 nm (specifically, an infrared (semiconductor) laser having a wavelength of 830 nm). A laser having a wavelength of 1064 to 1080 nm (specifically, a YAG laser having a wavelength of 1064 nm).

And the like. Of these,
For example, any of the laser beams in the wavelength ranges of and can be applied to both the lithographic printing plate having the photosensitive layer or the heat-sensitive layer of the above aspect (3) or (4). Further, any of the laser beams in the wavelength ranges of and can be applied to both the lithographic printing plate having the photosensitive layer or the heat-sensitive layer of the above aspect (1) or (2). Of course, the relationship between the wavelength range of laser light and the photosensitive layer or the heat sensitive layer is not limited to these.

Further, the lithographic printing plate of the present embodiment (the lithographic printing plates of all the above-mentioned aspects (1) to (11)) is an automatic plate making machine having an automatic plate feeding function in the state of forming a laminated bundle. It is set as a so-called plate setter or the like and is a planographic printing plate that may be supplied (plate supply) to the plate making process. However, in actual use, it does not depend on the usage of the planographic printing plate user such as whether the planographic printing plate is supplied by the automatic plate feeding mechanism or manually supplied (in other words, As a matter of matter before the plate method), all lithographic printing plates are included in the lithographic printing plate according to the invention. In addition, even lithographic printing plates of modes other than the above (1) to (11) are set on an automatic plate making machine having an automatic plate making function, a so-called platesetter, etc., and supplied to the plate making process (feeding). All lithographic printing plates that may be printed are included in the lithographic printing plate 12 according to the present embodiment.

Further, in the planographic printing plate, a so-called "discard plate" or "blank plate" is used which is set at a position where ink is not applied (that is, a non-printing region) depending on the space of a printing machine depending on the printing machine used. There is also what is called. As such, a waste plate or a blank plate is also included in the planographic printing plate 12 according to this embodiment.

The shape and the like of the planographic printing plate 12 are not particularly limited, and for example, the thickness is 0.1 to 0.5 mm and the long side (width) 30.
0 to 2050 mm, short side (length) 200 to 1500 mm
The aluminum plate may be coated with a coating film (photosensitive layer or heat-sensitive layer) on one side or both sides.

The processing line 14 shown in FIG. 1 is provided with a feeding device 18 which is formed in a band shape and further sequentially feeds the aluminum web (aluminum coil 16) wound into a coil shape. In addition, a feeder 22 is also provided, which is also formed in a strip shape, and further sequentially feeds the interleaf paper coil 20 wound into a coil shape. The web-shaped interleaving paper (interleaving paper web 26) sequentially delivered from the delivery machine 22 is superposed and nipped by the confluence roll 28 and the confluence nip roll 30 on the transported aluminum web 24.

Downstream of the confluence roll 28 and the confluence nip roll 30, an interleaving paper charging device 32 and a slitter 3 are provided in this order.
4, cutter 36, cutter belt 38, conveyor belt 4
0 and an integrated device 42 are provided.

The interleaf paper charging device 32 charges the interleaf paper web 26 and electrostatically adheres it to the aluminum web 24. And
While the aluminum web 24 and the interleaving paper web 26 are integrally conveyed, they are cut by the slitter 34 into a predetermined width in the conveyance direction. Further, the sheet-shaped lithographic printing plate 12 is formed by being cut along the width direction by the cutter 36. A sheet-like interleaving paper 66 is stuck to the planographic printing plate 12.

It is preferable to provide a static eliminator for statically eliminating the interleaving paper web 26 immediately before the interleaving paper charging device 32, because the interleaving paper web 26 can always be in the same charged state without being affected by disturbance.

The lithographic printing plate 12 thus obtained
Are conveyed by the cutter belt 38, and further conveyed by the conveyor belt 40. The conveyor belt 40 is provided with a pressing belt 44 so as to face each other with the lithographic printing plate 12 sandwiched therebetween. The lithographic printing plate 12 is pressed by the pressing belt 44 so that the lithographic printing plate 12 meanders or falls off accidentally. It is transported stably without causing any trouble.

The planographic printing plates 12 transported by the transport belt 40 are sequentially stacked in the thickness direction by a stacking device 42 to form a stacked bundle 46 of the planographic printing plates 12.

An interleaving paper drying box 48 and a moisture meter 50 are provided in this order between the interleaving paper roll feeder 22 and the confluence nip roll 30 along the conveyance path of the interleaving paper web 26, and a drying controller 52. Is electrically connected to.
The interleaf paper drying box 48 is controlled according to the water content of the interleaf paper web 26 measured by the moisture meter 50. In general, the lower the water content of the interleaf paper web 26, the easier it is to be charged by the interleaf paper charging device 32, and the electrostatic adhesive force to the aluminum web 24 can be increased. Further, when the drying capacity of the interleaf paper drying box 48 is constant, the moisture content of the interleaf paper web 26 after passing through the interleaf paper drying box 48 increases as the conveyance speed of the interleaf paper web 26 increases. The interleaving paper drying box 48 reliably charges the interleaving paper web 26 by the interleaving paper charging device 32 even when the transport speed of the aluminum web 24 and the interleaving paper web 26 assumed in the processing line 14 reaches the maximum speed. Aluminum web 2
The water content of the interleaf paper web 26 is controlled to be low (to 4.8% or less in the present embodiment) to such an extent that it can be reliably electrostatically adhered to No. 4. Therefore, the aluminum web 2
When the conveyance speed of 4 is lower than this maximum speed, the drying capacity of the interleaf paper drying box 48 is relatively high, so that the water content of the interleaf paper web 26 is maintained at 4.8% or less. .

The conveyor belt 40 is formed so as to extend downstream of the pressing belt 44 in the conveying direction, and a humidifying box 54 is arranged corresponding to this extended portion. An air blower 58 is attached to the humidification box 54 through a pipe 56.
The temperature adjusting device 60 and the humidifying device 62 are connected,
A circulation path for circulating the humidified air is formed as a whole. The air taken in from the outside by the blower 58 and the circulated air are adjusted to a predetermined temperature by the temperature adjusting device 60, and are further humidified by the humidifying device 62.

A moisture meter 64 is also provided in the integrated device 42, and is electrically connected to the humidifier 62. The humidification by the humidifying device 62 depends on the water content of the interleaf paper 66 measured by the moisture meter 64, and the water content is such that sparks are not generated when the planographic printing plates 12 are stacked by the stacking device 42 (in the present embodiment, 3). It is controlled to be 0.0% or more). As a result, the water content of the interleaf paper 66 becomes 3.0% or more immediately before the stacking by the stacking device 42.

As the humidifying box 54, the interleaving paper 6 is used.
Although it is not particularly limited as long as 6 can be humidified, for example, the one having the configuration shown in FIG. 2 can be adopted. In the humidifying box 54, a rectangular parallelepiped box 68 having an open lower surface is arranged, and a plurality of blowout nozzles 70 are arranged in the box 68 at regular intervals.
An intake duct 72 is connected to each of the blowout nozzles 70, and the humidified air sent from the humidifying device 62 is jetted toward the interleaf paper 66. Further, an exhaust duct 74 is connected to the box 68, and the exhaust duct 74 is further connected to a blower 58 (see FIG. 1), and air is discharged from the space between the intake ducts 72 to blow the blower 5
It is supposed to be sent to 8.

Further, the humidifier 62 is not particularly limited in specific constitution, but for example, the constitution shown in FIG. 3 can be adopted. In the humidifying device 62, an intake duct 78 and an exhaust duct 80 are connected to a rectangular parallelepiped humidity control box 76, and a steam nozzle 82 is further connected. A steam introduction pipe 86 for introducing steam from a steam generator (not shown) is connected to the steam nozzle 82 via a regulating valve 84. The air whose temperature has been adjusted by the temperature adjusting device 60 passes through the intake duct 78 and reaches the inside of the humidity control box 76 where it is mixed with the steam from the steam generating device. Since the amount of steam can be adjusted by the opening degree of the adjusting valve 84, the air in the humidity control box 76 can have a predetermined humidity. The air having a predetermined humidity is sent to the humidification box 54 through the exhaust duct 80.

Next, the method of manufacturing the planographic printing plate 12 by the processing line 14 of the present embodiment and the operation of the processing line 14 will be described.

In the processing line 14, the interleaving paper web 26 is nipped by the confluent roll 28 and the confluent nip roll 30 with respect to the aluminum web 24 in the conveyed state. The interleaving paper web 26 is electrically charged by the interleaving paper charging device 32, so that the aluminum web 2
Electrostatically bonded to 4.

In the pre-stage of this electrostatic adhesion, the water content of the interleaf paper web 26 is 4.8% by the interleaf paper drying box 48.
It is controlled as follows. As a result, the electrostatic adhesive force of the interleaving paper web 26 can be increased, and the interleaving paper web 26 can be strongly adhered to the aluminum web 24.

The aluminum web 24 to which the interleaving paper web 26 is adhered is cut by a slitter 34 and a cutter 36 into a lithographic printing plate 12 of a predetermined size, which is conveyed by a cutter belt 38 and a conveyor belt 40. Then, the stacking device 42 sequentially stacks them in the thickness direction to form a stacked bundle 46 of the planographic printing plates 12.

Here, the interleaving paper 66 is humidified by the humidifying box 54 before the stacking by the stacking device 42 (and after the electrostatic bonding by the interleaving paper charging device 32), and the water content thereof is 3.0%. It is controlled as described above. For this reason, the planographic printing plate 12 is substantially neutralized immediately before the accumulation, so that the occurrence of sparks during the accumulation is prevented.

Thus, the processing line 14 of this embodiment
In the (lithographic printing plate manufacturing apparatus), the water content condition (upper limit value) required to strongly electrostatically bond the interleaf paper web 26 and the water content condition (prevention of sparks during accumulation) ( The lower limit value) is controlled independently of each other. In other words, since the interleaving paper 66 is humidified by the humidifying box 54 in order to prevent the occurrence of sparks, when the interleaving paper web 26 is dried by the interleaving paper drying box 48, the lower limit value thereof is taken into consideration in order to prevent sparking. Need not be restricted. Therefore, the range of the water content required in the interleaf paper drying box 48 is substantially widened, and the control thereof becomes easy.

In particular, in this embodiment, even if the transport speeds of the aluminum web 24 and the interleaving paper web 26 assumed in the processing line 14 are the highest speeds, the interleaving paper web 26
The water content is controlled to be 4.8% or less.
Therefore, when the conveying speed of the aluminum web 24 and the interleaving paper web 26 is lower than this, the drying capacity of the interleaving paper drying box 48 becomes relatively high, and the water content of the interleaving paper web 26 is 4.8% or less. Therefore, the interleaving paper web 26 can be strongly adhered to the aluminum web 24.
That is, the lithographic printing plate 12 in which the interleaf paper 66 is strongly adhered can be stably produced regardless of the change in the transport speed of the aluminum web 24 on the processing line 14.

The interleaving paper web 26 or interleaving paper 6 described above is used.
The specific numerical value of the water content of 6 is just an example, and is appropriately set depending on the types of the aluminum web 24 (lithographic printing plate 12) and the interleaf paper 66 (interleaf web 26), the required electrostatic adhesive force, and the like. .

Further, in the above description, as the example of the static eliminator of the present invention, the case where the humidifying box 54 (humidifying device) for humidifying the interleaving paper 66 is adopted has been taken as an example. It suffices if the sparks at the time of stacking can be prevented by removing the electricity from the paper 66. Therefore, for example, a configuration in which a charge-removing ribbon (flexible and conductive strip or string, etc.) is lightly contacted and discharged so as not to damage the planographic printing plate 12 or charged particles (ions) are discharged. Interleaving paper 6
It is also possible to have a configuration in which the electricity is discharged by spraying onto 6.

The position of the moisture meter 64 is not limited to the above position. For example, it may be arranged immediately before the humidification box 64.

The interleaving paper web 2 can also be used as the drying device of the present invention.
The structure is not particularly limited as long as 6 can be dried to a predetermined water content. For example, it is possible to employ a structure in which dried hot air is blown onto the interleaf paper web 26 to dry it.

The protective sheet material according to the present invention is not limited to the slip sheet 66 described above. That is, planographic printing plate 1
2 (aluminum web 24) as long as it can be adhered to protect the coating film, it is widely included even if it is not conventionally called interleaving paper.

The timing of electrostatically bonding the planographic printing plate 12 and the interleaf paper 66 does not necessarily have to be before cutting (aluminum web 24 and interleaf paper web 26). That is, the present invention can be applied to a configuration in which the interleaving paper 66 cut into a predetermined size in advance is bonded to the planographic printing plate 12.

[0057]

EXAMPLES Next, the present invention will be described more specifically by way of examples, but the present invention is not limited to these examples.

In this embodiment, the processing line 14 shown in FIG.
Thus, the planographic printing plate 12 cut into a predetermined size was obtained. First, as the aluminum web 24, width 1
000mm, 0.3mm thick aluminum plate (material: 1
060 material) was prepared. Also, as the interleaving paper web 26,
A pulp paper having a width of 1000 mm and a basis weight of 35 g / m ² was prepared. The water content of the interleaf paper web 26 before drying in this example was 5%.

The interleaf paper drying box 48 is provided in the interleaf paper web 26.
We adopted a structure in which dry hot air is blown to dry the product. The temperature of the warm air blown onto the interleaving paper web 26 is 180.
The temperature of the hot air at the time of blowing out was set to 30 m / sec.

The voltage applied by the interleaf paper charging device 32 is -10.
It was set to kV.

In the humidification box 54, the amount of steam sent from the steam generator (not shown) to the humidity control box 76 is adjusted by the adjusting valve 84 so that the water content measured by the moisture meter 50 is 6.0%. (In this embodiment, an automatic valve is used to reduce the work load on the operator). The temperature of the air blown from the blowing nozzle 70 was set to 40 ° C., the blowing rate was set to 30 m / sec, and the blowing time was set to 10 seconds.

Under the above conditions, as shown in Examples 1 and 2 below, the conveying speed of the aluminum web 24 was changed to change the adhesiveness of the interleaf paper 66 to the planographic printing plate 12 and the stacking device. The presence or absence of sparks at 42 was examined. The transport speed of the interleaf paper web 26 is the same as the transport speed of the aluminum web 24. [Example 1] In Example 1, the transport speed of the aluminum web 24 was set to 50 m / min. At this time, the interleaving paper web 26
Has a water content of 4%.

The interleaf paper 66 was not peeled off from the planographic printing plate 12 during the cutting and conveyance after the charge adhesion by the interleaf paper charging device 32.

The lithographic printing plate 12 was further transported and humidified by the humidifying box 54. The residence time of the interleaving paper web 26 in the humidification box 54 was 2.4 seconds. Then, as set in advance, the moisture content of the interleaf paper 66 humidified by the humidification box 54 became 6.0%. As a result, since the discharge was substantially performed, no spark was generated during the integration by the integration device 42. [Embodiment 2] In Embodiment 2, the transport speed of the aluminum web 24 is set to 5 m / min. At this time, the water content of the interleaf paper web 26 was 2.5%.

The interleaf paper 66 was not peeled off from the planographic printing plate 12 during the cutting and conveyance after the charge adhesion by the interleaf paper charging device 32.

The planographic printing plate 12 was further transported and humidified by the humidifying box 54. The residence time of the interleaf paper web 26 in the humidification box 54 was 24 seconds. Then, as set in advance, the moisture content of the interleaf paper 66 humidified by the humidification box 54 became 6.2%. As a result, since the discharge was substantially performed, no spark was generated during the integration by the integration device 42.

[0067]

EFFECTS OF THE INVENTION Since the present invention has the above-mentioned constitution, the protective sheet material can be surely adhered to the lithographic printing plate, and furthermore, the generation of sparks can be prevented and the lithographic printing plate can be stably manufactured. You can

[Brief description of drawings]

FIG. 1 is a schematic view showing a processing line according to an embodiment of the present invention.

FIG. 2 is a schematic view showing an example of a humidification box applied to the processing line according to the embodiment of the present invention.

FIG. 3 is a schematic view showing an example of a humidifying device applied to the processing line according to the embodiment of the present invention.

[Explanation of symbols]

12 Planographic printing plates 14 Processing line (lithographic printing plate manufacturing equipment) 24 Aluminum web 26 Synthetic paper 32 interleaf paper charging device (bonding device) 42 Integrated device 48 Drying box (dryer) 54 Humidification box (humidification device, static eliminator) 66 interleaf paper

Claims (6)

[Claims] 1. An adhesive device for electrostatically adhering a protective sheet material for protecting the lithographic printing plate to a conveyed lithographic printing plate, and the protective sheet material before the electrostatic adhering by the adhesive device. A drying device for drying, a stacking device for stacking the planographic printing plates on which the protective sheet material is electrostatically bonded in the thickness direction, and after the electrostatic bonding of the protective sheet material by the bonding device, and the stacking device Prior to accumulating the planographic printing plates according to 1., a static eliminating device for eliminating static electricity from the protective sheet material. 2. The planographic printing plate manufacturing apparatus according to claim 1, wherein the static eliminator is a humidifier for humidifying the protective sheet material. 3. The moisture content of the protective sheet material by the drying device is set to 4.8% or less, and the moisture content of the protective sheet material by the humidifying device is 3.0.
The lithographic printing plate manufacturing apparatus according to claim 2, wherein the lithographic printing plate manufacturing apparatus is set to be at least%. 4. A drying step of drying a protective sheet material for protecting the lithographic printing plate, an adhesive step of electrostatically adhering the protective sheet material dried by the drying step to a lithographic printing plate in a conveyed state, and the adhesion. A static elimination step of eliminating static electricity from the protective sheet material electrostatically adhered to the planographic printing plate by a step, and an accumulation step of accumulating the planographic printing plates from which the protective sheet material is statically eliminated by the static elimination step in the thickness direction. A method for producing a lithographic printing plate, comprising: 5. The planographic printing plate manufacturing method according to claim 4, wherein the static elimination step is a humidification step of humidifying the protective sheet material. 6. The moisture content of the protective sheet material in the drying step is set to 4.8% or less, and the moisture content of the protective sheet material in the humidifying step is 3.0.
The lithographic printing plate manufacturing method according to claim 5, wherein the lithographic printing plate manufacturing method is set to at least%.