JP2009126127A - Method of manufacturing laminated body of lithographic printing plate material, and manufacturing device of lithographic printing plate material - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method of manufacturing a laminated body of a lithographic printing plate material showing excellent laminatability of a printing plate material by preventing the generation of a gap or a crease of a slip sheet and made by stacking the lithographic printing plate material on the slip sheet. <P>SOLUTION: The method of manufacturing the laminated body of the lithographic printing plate material includes the process of stacking the long slip sheet on the long lithographic printing plate material having a photosensitive layer on a support, the cutting process of cutting the laminate of the lithographic printing plate material and the slip sheet into a rectangular shape, and the laminating process of stacking a plurality of the cut laminates of the lithographic printing plate material and the slip sheet, wherein only the central portion of the long slip sheet in the lengthwise direction is charged electrostatically in the laminating process. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a method for producing a laminate of lithographic printing plate materials on which slip sheets are stacked, and in particular, image formation used in a so-called computer-to-plate (hereinafter referred to as “CTP”) system. The present invention relates to a method for producing a lithographic printing plate material having a layer.

  As a photosensitive lithographic printing plate material used for the preparation of a lithographic printing plate, a sheet-shaped material having a structure in which a thin photosensitive layer is provided on a support such as an aluminum plate is generally used.

  In general, sheet-like lithographic printing plate materials are laminated in a plurality of sheets and distributed in the market. When they are laminated, a so-called interleaf paper is inserted between the lithographic printing plate materials. Methods such as sandwiching and laminating while protecting the photosensitive layer are performed.

  When producing a large amount of lithographic printing plate material, after producing a lithographic printing plate material provided with a photosensitive layer on a long support, a charged long slip sheet is stacked on the lithographic printing plate material, Then, a method of cutting to a predetermined size is known (see Patent Document 1).

  In such a method, there is a problem that the interleaving paper is peeled off or shifted, causing problems when stacking the lithographic printing plate materials, or causing defective products (see Patent Document 2).

  On the other hand, by charging the lithographic printing plate material and the slip sheet so that the two opposite sides of the sheet shape are charged, the slip sheet is prevented from being peeled off or shifted. There are known methods for reducing troubles during the integration of planographic printing plate materials and improving the yield of products.

However, these methods also have a problem that slippage of paper, wrinkles, and the like are caused, and unevenness in image reproducibility and stains during printing may occur.
JP-A-61-241096 Japanese Patent Laid-Open No. 10-175765

  An object of the present invention is to provide a method for producing a laminate of a planographic printing plate material in which a planographic printing plate material and a slip sheet are laminated, with excellent slippage and wrinkle prevention properties and excellent laminating properties of the printing plate material Is to provide.

The above object of the present invention is achieved by the following configurations.
1. An overlapping step of stacking a long slip sheet on a long planographic printing plate material having a photosensitive layer on the support, a cutting step of cutting the stacked planographic printing plate material and slip sheet into a rectangle, and cutting A method for producing a laminate of lithographic printing plate materials, wherein a plurality of lithographic printing plate materials laminated with interleaving papers are stacked, A method for producing a laminate of a lithographic printing plate material, wherein only the central part of the direction is charged.
2. 2. The method for producing a laminate of a lithographic printing plate material according to 1, wherein the superimposing step includes a charging step, and in the charging step, the long slip sheet is charged while being conveyed.
3. 3. The method for producing a laminate of a lithographic printing plate material according to 1 or 2, further comprising a whole surface charging step of charging the whole surface of the cut lithographic printing plate material and the slip sheet after the cutting step.
A lithographic printing plate material manufacturing apparatus used in the method for manufacturing a lithographic printing plate material laminate according to 4.2 or 3, comprising: a first charging unit that charges a central portion in the longitudinal direction of a slip sheet; An apparatus for producing a lithographic printing plate material, comprising:
5). 5. The apparatus for producing a lithographic printing plate material according to 4, further comprising a second charging means for charging the entire surface of the cut lithographic printing plate material and the interleaf.

  According to the above configuration of the present invention, there is provided a method for producing a laminate of a planographic printing plate material in which slippage and wrinkle generation prevention properties are excellent and plate lamination is excellent, and the planographic printing plate material and the slip sheet are laminated. it can.

  Hereinafter, the present invention will be described in more detail.

  The present invention relates to a method for producing a laminate of a lithographic printing plate material, comprising a step of overlapping a long slip sheet on a long lithographic printing plate material having a photosensitive layer on a support, and a stacked lithographic plate A method for producing a laminate of a planographic printing plate material, comprising: a cutting step of cutting the printing plate material and the slip sheet into a rectangle; and a stacking step of stacking a plurality of cut planographic printing plate materials on which the slip sheets are stacked In the stacking step, only the central portion in the longitudinal direction of the long slip sheet is charged.

  In the present invention, in particular, by selectively charging only the center portion of the slip sheet and overlapping the planographic printing plate material and slip sheet, slippage of the slip sheet, prevention of wrinkle generation is good, and excellent plate stackability. In addition, a method for producing a laminate of a lithographic printing plate material having excellent productivity can be provided.

(Lithographic printing plate materials)
(Support)
The support according to the present invention is a plate or film capable of carrying a photosensitive layer, and preferably has a hydrophilic surface on the side where the photosensitive layer is provided.

  Examples of the support according to the present invention include a metal plate such as aluminum, stainless steel, chromium and nickel, or a laminate obtained by laminating or vapor-depositing the above metal thin film on a plastic film such as a polyester film, a polyethylene film and a polypropylene film. .

  Moreover, although what hydrophilized the surface, such as a polyester film, a vinyl chloride film, a nylon film, etc. can be used, an aluminum support body is used preferably.

  In the case of an aluminum support, pure aluminum or an aluminum alloy is used.

(Photosensitive layer)
The photosensitive layer according to the present invention is a layer capable of forming an image by image exposure, and either a negative type or a positive type photosensitive layer conventionally used as a photosensitive layer of a lithographic printing plate can be used.

  Examples of the photosensitive layer according to the invention include a heat-sensitive image forming layer, a polymerization type image forming layer, and a decomposition type positive image forming layer.

  The lithographic printing plate material according to the present invention can be obtained by applying a coating solution containing each component contained in the photosensitive layer on the support and drying to form a photosensitive layer (image forming layer).

(Interleaf)
The material of the interleaving paper according to the present invention is not particularly limited, and examples thereof include paper, non-woven fabric, plastic sheet or film, or laminated sheet or film having a resin layer on one or both sides of paper. It is done.

  As paper, those made from mechanical pulp made by mechanical processing such as ground pulp, those made from chemical pulp made by chemical treatment, semi-chemical pulp and chemi-ground made by combining both treatments What uses pulp as a raw material is mentioned.

  The pulp may be either bleached pulp bleached in the refining process or unbleached unbleached pulp. Furthermore, chemical fiber paper made of chemical fibers such as rayon, nylon, vinylon, polyester, polyacrylonitrile, polystyrene and the like can also be used. Furthermore, these papers impregnated with organic substances can be exemplified, and there is no particular limitation.

  In the present invention, high-quality paper, paper called medium-quality paper, or paper coated with plastic on these can be preferably used.

  As the interleaving paper, a lithographic printing plate material having a smoothness of the surface in contact with the photosensitive layer side surface of 25 seconds or less and a smoothness of the surface opposite to the surface in contact with the photosensitive layer side surface of 150 seconds is preferably used. It is done. Furthermore, a slip sheet having an air resistance of 100 seconds or more can be preferably used.

  The surface in contact with the photosensitive layer side surface is the surface in contact with the surface of the interleaf paper on the side where the photosensitive layer of the planographic printing plate material is present. The photosensitive layer side surface is the surface of the photosensitive layer when no other layer is present on the photosensitive layer, and the surface of the layer farthest from the photosensitive layer when the photosensitive layer has a layer such as a protective layer. is there.

  Smoothness refers to Beck smoothness, and the value of Beck smoothness refers to a value measured based on JIS-8119 (1998).

  As a method for adjusting the smoothness of the interleaving paper, it can also be adjusted by the type of pulp as a raw material, beating conditions, the type of chemical used, the amount used, and a manufacturing method such as calendar processing during papermaking. In the present invention, slip sheets prepared by any method can be used.

The value of the air permeability resistance is a value measured based on JIS P 8117. The air resistance is a value indicating the resistance of paper to air passage, and is represented by the time taken for 100 ml of air to pass through paper having an area of 645 mm ² .

  As a method of adjusting the air permeability resistance of the interleaving paper, it is possible to adjust it depending on the type of fiber material that is the raw material, the beating condition, the basis weight of the paper, the type of chemicals used, such as the sizing agent, and the amount used. I can do it. In the present invention, interleaving paper whose air resistance is adjusted by any method can be used.

  The present invention includes a step of stacking a long slip sheet on a long planographic printing plate material. Overlaying slip sheets on a lithographic printing plate material means stacking slip sheets on the surface of the planographic printing plate material having the photosensitive layer.

  As a method of overlaying a slip sheet on the surface having the photosensitive layer, a lithographic printing plate material coated with a photosensitive layer, dried, and transported with a photosensitive layer is conveyed, for example, a roll prepared in advance in a roll shape. A method in which the paper is brought into close contact with the plate while being fed out is preferably used.

  In the present invention, in the stacking step, only the central portion of the long slip sheet in the long direction is charged. By charging only the center part, when the planographic printing plate material is cut, it is possible to prevent peeling, slipping and wrinkling of the slip sheet. Fine adjustment is possible.

  FIG. 1 is a schematic view showing a central portion of a slip sheet.

  In the present invention, the central portion 2 in the longitudinal direction of the interleaving paper 1 is a portion corresponding to the central portion 4 of the planographic printing plate material 3 to be overlaid.

  The central portion 4 of the lithographic printing plate material 3 is a straight line parallel to each side of the two sides T1 and T2 extending in the longitudinal direction on the long lithographic printing plate material 3, and is long from each side. A portion surrounded by straight lines t1 and t2 that are separated by a distance of 1/3 of the width D of the long planographic printing plate material 3 in a direction perpendicular to the direction.

  The fact that only the central portion in the longitudinal direction of the long slip sheet is charged means that at least one part of the center portion 2 in the longitudinal direction of the slip sheet is charged and the outside thereof is not charged. That is.

  FIG. 2 is a plan view showing an example of how the interleaf paper is charged, and shows the interleaf paper that has been cut into a rectangular shape and stacked on the planographic printing plate material. In (a), all of the central portion 2 in the longitudinal direction of the interleaf 1 is charged. In (b), (c), and (d), a part of the center portion of the slip sheet 1 in the longitudinal direction is charged.

  FIG. 3 is a schematic view of an example of an apparatus for carrying out the laminate manufacturing method of the present invention.

  In FIG. 3, 21 indicates an overlapping process, 22 indicates a cutting process, 23 indicates a stacking process, and 24 indicates an entire charging process.

  In the example shown in FIG. 3, the long planographic printing plate material 3 is transported and the long slip sheet 1 is stacked by the nip roller 11. The stacked interleaf paper 1 is charged at the center while being conveyed by the first charging means 12. With the center portion charged, the sheet is cut into a predetermined size by the cutting blade 13. The cut rectangular planographic printing plate material 5 is conveyed by the conveyor 6 and moves to the laminating step 23.

  The lithographic printing plate material that has been cut is subjected to a whole surface charging process by a second charging unit (entire surface charging unit) 14 in a whole surface charging step 24 immediately before being laminated, and then laminated.

  FIG. 4 is a schematic view showing charging by the first charging means. The charging means 12 has a structure in which a plurality of small charging members 15 shorter than the width of the slip sheet are arranged in a direction perpendicular to the conveyance direction of the slip sheet 1. The charging members can be turned on / off independently, and the region to be charged can be freely changed according to the width of the lithographic printing plate material to be manufactured.

  Therefore, it is possible to set so that only the center is charged. Discharging for charging performed by the charging member 15 may be continuous, or may be turned on / off in conjunction with the movement of the slip sheet. Moreover, on / off may be repeated in a constant pulse shape. In the charging step, a region 16 charged by the first charging means 12 is generated.

  FIG. 5 is a schematic diagram showing charging by the second charging means.

  The second charging means 14 has a charging member that covers the entire width in the lateral direction in order to charge the full width of the slip sheet. In the entire charging step, a region 17 charged by the second charging means 2 is generated.

  The slip sheet and the lithographic printing plate material, the entire surface of which is charged by the second charging unit 14, are stacked to form the stacked body 7.

  In the present invention, it is preferable from the viewpoint of scratch resistance and prevention of unevenness in performance that the step of stacking the slip sheets is performed at a humidity of 40% RH (relative humidity) to 80% RH (relative humidity).

  In the present invention, after a lithographic printing plate material and a slip sheet are laminated to produce a laminate, an aging treatment may be performed to stabilize the performance.

  EXAMPLES Hereinafter, although an Example is given and this invention is demonstrated in detail, the aspect of this invention is not limited to this.

(Lithographic printing plate materials, slip sheets)
A photopolymer printing plate material was used as the lithographic printing plate material. In the photopolymer printing plate material, an oxygen blocking layer of polyvinyl alcohol is coated on the photosensitive layer. As the support, an aluminum plate (JIS alloy number 1050), a width of 953 mm, a thickness of 0.3 mm, and a length of 5000 m was used.

As the interleaving paper, 100% natural pulp, 0.05 mm thickness, 10000 m length, and a basis weight of 30 g / m ² were used.

(Production conditions)
The apparatus shown in FIG. 3 was used. As production conditions, the conveyance speed of the production line was 20 m / min, and the cutting length in the cutting unit was 610 mm.

(Production method)
The printing plate material is unwound from the original winding, the interleaving papers are overlapped and brought into close contact with the nip roller 11, and then charged from above the interleaving paper conveyed by the charging means 12. The charging unit 12 calculates the charging time from the cutting signal, the conveyance speed, and the distance between the charging unit 12 and the cutting unit (not shown), and activates the charging process.

  In the width direction, the charging width is calculated from the original winding width of the printing plate material, and the charging member is operated only in necessary portions.

  After the electrification treatment, the sheet is cut to a length of 610 mm by a cutting unit to produce a rectangular planographic printing plate material on which slip sheets are stacked. The rectangular planographic printing plate material is conveyed to the laminating step 24 by the conveyor 6. Immediately before the lamination, the entire surface in the width direction was charged by the second charging unit 14, and a rectangular planographic printing plate material was laminated after the whole surface charging step to obtain a laminate 7.

  The laminate of the lithographic printing plate material was prepared by performing the charging by the first charging unit and the charging by the second charging unit under the conditions shown in the following and Table 1, and a sample of the laminate manufactured under each condition 1-12 were obtained. These laminates were evaluated by the following methods.

(Sample 1)
No charging process by the first charging unit and the second charging unit.

(Sample 2)
Using the first charging means, only the charging device 1 was used and the entire surface was charged.

(Sample 3)
The charging method of Sample 2 was the same as Sample 2 except that only the first charging device was used and the charging region shown in FIG.

(Sample 4)
The charging method of Sample 2 was the same as Sample 2 except that only the first charging device was used and the charging region shown in FIG.

(Sample 5)
The charging method of Sample 2 was the same as Sample 2 except that only the first charging device was used and the charging region shown in FIG.

(Sample 6)
The charging method of Sample 2 was the same as Sample 2 except that only the first charging device was used and the charging region shown in FIG.

(Sample 7)
The same procedure as in Sample 1 was performed except that the second charging means 2 was used and the entire surface was charged.

(Sample 8)
The same procedure as in Sample 2 was performed except that the second charging unit 2 was used and the entire surface was charged.

(Sample 9)
The same procedure as in Sample 3 was performed except that the second charging means 2 was used to charge the entire surface.

(Sample 10)
The same procedure as in Sample 4 was performed except that the second charging means 2 was used to charge the entire surface.

(Sample 11)
The same procedure as in Sample 5 was performed except that the second charging unit 2 was used and the entire surface was charged.

(Sample 12)
The same procedure as in Sample 6 was performed except that the second charging means 2 was used and the entire surface was charged.

(Evaluation)
After cutting 5000 sheets, the case where there was a problem such as peeling, folding, wrinkling, etc. in the slip sheet was less than 2%.

  In addition, ◎ indicates that there was no problem in the lamination properties of the cut sheet-like lithographic printing plate material, ○ indicates that the lithographic printing plate material and slip paper are not aligned slightly, ○ indicates that the sheets can be stacked but does not align neatly The case where a defect occurred in the lamination was evaluated as x, and the case where the defect was indicated as pass.

  The results are shown in Table 1.

  From Table 1, it can be seen that the method for producing a laminate of a planographic printing plate material of the present invention can suppress slippage of paper and generation of wrinkles, and is excellent in laminateability. Since there is a need for an operation such as sorting and removing the interleaving paper from the product, the production method of the present invention, which is excellent in the laminating property, is excellent in productivity.

It is the schematic which shows the center part of a slip sheet. It is a top view which shows the example of how a slip sheet is charged. It is the schematic of the example of the apparatus for enforcing the manufacturing method of the laminated body of this invention. It is the schematic which shows the charge by the 1st charging means. It is the schematic which shows the charge by a 2nd charging means.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Interleaving paper 2 Center part of the longitudinal direction of interleaving paper 3 Planographic printing plate material 4 Central part of lithographic printing plate material 7 Laminated body 11 Nip roller 12 1st charging means 13 Cutting blade 14 2nd charging means 15 Charging member

Claims (5)

A stacking step of stacking a long slip sheet on a long planographic printing plate material having a photosensitive layer on the support, a cutting step of cutting the stacked planographic printing plate material and slip sheet into a rectangle, and cutting A method for producing a laminate of lithographic printing plate materials, wherein the lithographic printing plate material is laminated with a plurality of lithographic printing plate materials on which interleaving papers are stacked. A method for producing a laminate of a lithographic printing plate material, wherein only the central part of the direction is charged. The method for producing a laminate of a lithographic printing plate material according to claim 1, wherein the superimposing step includes a charging step, and in the charging step, the long slip sheet is charged while being conveyed. The method for producing a laminate of a lithographic printing plate material according to claim 1 or 2, further comprising a whole surface charging step of charging the whole surface of the cut lithographic printing plate material and the slip sheet after the cutting step. . A lithographic printing plate material manufacturing apparatus used in the method for manufacturing a lithographic printing plate material laminate according to claim 2 or 3, wherein the first charging means for charging the longitudinal center of the slip sheet is provided. An apparatus for producing a lithographic printing plate material, comprising: 5. The apparatus for producing a lithographic printing plate material according to claim 4, further comprising second charging means for charging the entire surface of the cut lithographic printing plate material and the interleaf.

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