JP2008068588A - Interleaving paper for lithographic printing plate, lithographic printing plate laminates using interleaving paper, and its manufacturing process - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an interleaving paper for lithographic printing plate which exfoliates in sureness from lithographic printing plate in the case where the automatic feed of the lithographic printing plate is being carried out, the lithographic printing plate laminates using the interleaving paper and the manufacturing method to manufacture the lithographic printing plate laminates. <P>SOLUTION: The laminate 14 is formed by stacking alternatively the interleaving sheet of paper 10, having 30 mm or less curling value, and the lithographic printing plate 12. The manufacturing equipment 60 of the laminates 14 first carries out curl correction of the web 66 for the interleaving sheets of paper at curl correction section 92 and then adheres them to the web 62 for the lithographic printing plates and thus manufactures the laminates 14 made of the carling value controlled interleaving sheets of paper 10 and the lithographic printing plates 12. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a planographic printing plate slip sheet, a planographic printing plate laminate using the same, and a method for producing the same, and more particularly to a planographic printing plate slip layered between planographic printing plates that can be directly made from digital data. .

  In recent plate making methods including electrophotographic plate making methods, lithographic printing plates such as photosensitive printing plates and heat-sensitive printing plates are widely used in order to facilitate automation of the plate making process. A lithographic printing plate is used in various surface treatment tanks for hydrophilizing surface treatment such as graining, etching, anodizing, silicate treatment, and other chemical conversion treatments on the surface of a support made of a sheet-like or coil-like aluminum plate. 1 or in combination, and then, after applying a photosensitive solution or a heat-sensitive solution and performing a drying treatment, it is cut into a desired size (see Patent Document 1).

  The manufactured lithographic printing plate is packaged in a laminated state, and packed in a box or pallet before shipment. In that case, interleaving paper is usually interposed between the lithographic printing plates to protect the photosensitive layer and the heat-sensitive layer of the lithographic printing plate (see Patent Document 2).

As described above, when a planographic printing plate having interleaving paper interposed therebetween is used in an automatic plate making machine or the like, it is necessary to peel the interleaving paper from the planographic printing plate. In view of this, a plate supplying apparatus that automatically removes the slip sheet and supplies the planographic printing plate has been developed. In particular, in a plate supply device for a lithographic printing plate (for example, a lithographic printing plate for a heat mode method and a photon method laser plate) that can be directly made from digital data, the separation of the slip sheet and the supply of the lithographic printing plate are automated. Is being actively developed. For example, the plate supply apparatus described in Patent Document 3 sucks the upper surface (Al surface) of a lithographic printing plate with an adsorption pad, and rotates the adsorption pad upward by an arm to send out only the lithographic printing plate. The slip sheet is sucked by the suction pad and discharged. According to this plate supply device, the upper and lower surfaces are reversed and sent out while the planographic printing plate is curved.
JP 2002-240455 A JP 2003-302749 A JP 2004-18180 A

  However, the above-described printing plate supply device has a problem that when the planographic printing plate is sent out, the slip sheet is sent out while adhering to the planographic printing plate, causing a problem.

  The present invention has been made in view of such circumstances, and a planographic printing plate slip sheet that is reliably peeled from a planographic printing plate when a planographic printing plate is automatically supplied, and planographic printing using the slip sheet It is an object of the present invention to provide a plate laminate and a production method for producing the same.

  In order to achieve the above-mentioned object, the invention according to claim 1 is characterized in that a curl value is 30 mm or less in a planographic printing plate interleaf disposed between laminated planographic printing plates. The curl value of the slip sheet is the maximum curl value (that is, the warp of the slip sheet) when a slip sheet of 100 mm × 100 mm size is placed on a flat table and humidity is adjusted for 24 hours at a temperature of 25 ° C. and a humidity of 25%. The maximum height of the raised part).

  The inventor of the present invention pays attention to the curl value of the slip sheet as a cause of the trouble that the slip sheet is conveyed with the lithographic printing plate. If this curl value is 30 mm or less, the slip sheet is surely peeled from the lithographic printing plate. I got the knowledge that.

  The invention described in claim 1 is made based on such knowledge, and the curl value of the slip sheet is set to 30 mm or less, so that the slip sheet can be reliably peeled from the lithographic printing plate. Therefore, only the planographic printing plate can be reliably conveyed when the planographic printing plate is automatically supplied.

  In order to achieve the above object, the invention according to claim 2 is a planographic printing plate laminate in which a planographic printing plate and a planographic printing plate interleaving paper are alternately laminated, and the curling of the planographic printing plate interleaf The value is 30 mm or less.

  According to a third aspect of the present invention, in order to achieve the above object, a long lithographic printing plate web and a long interleaf web are overlapped, and the two overlapped webs are cut in the width direction. In the production method for producing a lithographic printing plate laminate of a lithographic printing plate and a lithographic printing plate interlaminar by laminating, the curling web is curled and superimposed on the lithographic printing plate web, The curl value of the planographic printing plate interleaf of the planographic printing plate laminate is 30 mm or less.

  According to the third aspect of the present invention, the curling value of the slip sheet is reduced to 30 mm or less by correcting the curl of the slip sheet web and superimposing it on the planographic printing plate web, so that the planographic printing plate is automatically supplied. When doing so, the slip sheet can be reliably peeled off.

  According to the present invention, since the curl value of the interleaving paper laminated between the lithographic printing plates is set to 30 mm or less, the interleaving paper can be reliably peeled off from the lithographic printing plate during the automatic supply of the lithographic printing plate.

  Hereinafter, preferred embodiments of a planographic printing plate interleaf according to the present invention, a planographic printing plate laminate using the same, and a method for producing the same will be described with reference to the accompanying drawings.

  First, a planographic printing plate interleaf (hereinafter simply referred to as interleaving paper) according to the present invention and a laminate of planographic printing plates laminated using the same will be described. FIG. 1 is a perspective view showing a laminate of a planographic printing plate. As shown in the figure, the laminate 14 is configured by alternately laminating the planographic printing plate 12 and the interleaf paper 10.

  The interleaf paper 10 prevents the lithographic printing plates 12 and 12 from rubbing and being damaged. The material of the interleaf paper 10 is, for example, a mechanical pulp made by mechanical processing such as ground pulp, or a chemical processing. For example, those using the chemical pulp as a raw material, those using a semi-chemical pulp or a chemi-ground pulp made by using both treatments as a raw material, and the like are used. The pulp may be either bleached pulp bleached in the refining process or unbleached unbleached pulp. In addition, instead of wood pulp, non-wood pulp such as straw, bamboo, straw, three bases, hemp, cotton, waste paper, etc. can be used, or synthetic pulp made from polyethylene, polypropylene, polyester, etc. can be blended with these pulps. Paper making may be used. Furthermore, you may use the chemical fiber paper which consists of chemical fibers, such as rayon, nylon, vinylon, polyester, polyacrylonitrile, and polystyrene. The amount of Mg, Al, and Si contained in the interleaf paper 10 is preferably 0.5% by weight or less.

  As the interleaf paper 10, one having a curl value of 30 mm or less is used. As shown in FIG. 2, the curl value of the slip sheet is obtained by placing the slip sheet on a flat table and measuring the height h of the most warped part. In this case, the curl value is measured after using the slip paper 10 having a size of 100 mm × 100 mm and conditioning the slip paper 10 at a temperature of 25 ° C. and a humidity of 25% for 24 hours. The curl value of the interleaf paper 10 is preferably 30 mm or less, more preferably 10 mm or less, and even more preferably 3 mm or less in order to eliminate problems in the later-described plate supply apparatus.

  On the other hand, the lithographic printing plate 12 is a plate that can be directly made from digital data, such as a photopolymerization lithographic printing plate. The photopolymerization type lithographic printing plate is a direct plate making in which a printing image is directly written on the lithographic printing plate with a laser beam, a radical generator that generates radicals by light, an alkali-soluble binder, a polyfunctional monomer, and And / or a plate-making layer in which a photopolymerizable layer containing a prepolymer and an oxygen-blocking resin layer for protecting the photopolymerizable layer from oxygen in the air are laminated. Moreover, as the lithographic printing plate 12, in addition to the photopolymerization lithographic printing plate, for example, the following (1) to (12) may be used. That is, (1) an embodiment in which the plate-making layer contains an infrared absorber, a compound that generates an acid by heat, and a compound that crosslinks by an acid, and (2) the plate-making layer contains an infrared absorber, and is alkali-soluble by heat. (3) an embodiment in which the plate-making layer is composed of two layers of a physical development nucleus layer and a silver halide emulsion layer, and (4) the plate-making layer comprises a polyfunctional monomer and a multifunctional binder. A mode comprising three layers of a polymer layer containing, a layer containing silver halide and a reducing agent, and an oxygen-blocking resin layer, (5) a plate making layer comprising a novolak resin and a naphthoquinonediazide and a silver halide (6) an embodiment in which the plate making layer contains an organic photoconductor, (7) a laser light absorbing layer in which the plate making layer is removed by laser light irradiation, and an oleophilic layer And / or parent A mode comprising 2 to 3 layers consisting of a functional layer, (8) a compound in which the plate-making layer absorbs energy and generates an acid, and a polymer having a functional group that generates a sulfonic acid or a carboxylic acid by an acid in the side chain An embodiment containing a compound and a compound that absorbs visible light and gives energy to the acid generator, (9) an embodiment in which the plate-making layer contains a quinonediazide compound and a novolac resin, and (10) a plate-making layer that is light or ultraviolet An embodiment containing a compound that decomposes by itself to form a crosslinked structure with self or other molecules in the layer and an alkali-soluble binder, (11) a lipophilic layer in which the plate-making layer contains an infrared absorber, It includes three layers, a hydrophilic layer containing silica and a water-soluble protective layer containing an infrared absorber, and the adhesion between the oleophilic layer and the hydrophilic layer is released by heat, and is moistened on a printing press. Current by water (12) A lithographic plate having any one of the modes in which the plate-making layer includes two layers of a heat-sensitive layer containing carbon black and an oil-repellent layer containing organopolysiloxane. Examples include printing plates.

  The slip sheet 10 and the lithographic printing plate 12 described above are alternately laminated as shown in FIG. 1, thereby forming a laminate 14. The laminated body 14 is shipped in the packaging form suitable for conveyance by packaging. For example, as shown in FIG. 1, the ball 16 is disposed on the upper and lower surfaces of the laminated body 14 as shown in FIG. 1, and is wrapped with interior paper 18 as shown in FIG. A package 22 is configured. The package 22 is stored in an outer box or loaded on a pallet as needed. In addition, the packaging form of the laminated body 14 is not limited to the above-described one. For example, the hitting ball 16 and the interior paper 18 may or may not be provided. In addition to normal cardboard box packaging, skid It may be a skid type package in which the laminate 14 is placed and packaged thereon, and a paper pallet type package in which the laminate bundle is placed and packaged on a paper pallet. Further, the number of lithographic printing plates 12 constituting the laminate 14 is not particularly limited. However, from the viewpoint of transportation and storage efficiency, ease of mounting on the plate supply device, and the like, for example, 10 to 100 The lithographic printing plate 12 and the contact ball 16 are preferably fixed so as not to be displaced from each other by a fixing means such as an adhesive tape. Further, a larger number of the lithographic printing plates 12 may be laminated by applying the balls 22 every 20 to 100 lithographic printing plates 12.

  The laminate 14 configured as described above is transported to a printing factory in the form of a package. And the laminated body 14 is taken out in a printing factory, and is set to a printing plate supply apparatus.

  4A and 4B are side views schematically showing an example of the plate supply apparatus. In the plate supply apparatus 30 shown in the figure, the laminate 14 is set so that the photosensitive surface and the heat-sensitive surface of the planographic printing plate 12 face down.

  As shown in these drawings, the plate supply apparatus 30 includes a suction plate 32 for sucking the planographic printing plate 12 and a suction plate 34 for sucking the interleaf paper 10. The suction disk 32 is supported by the traveling body 38 via the arm 36. The traveling body 38 is slidably supported by the guide rail 40 and is configured to travel along the guide rail 40 by a driving means (not shown). The arm 36 is rotatably attached to the traveling body 38 and is configured to rotate in conjunction with the traveling body 38 traveling along the guide rail 40. Specifically, as shown in FIG. 4A, when the traveling body 38 is disposed at the left end position, the arm 36 faces downward, and the arm 36 rotates clockwise as the traveling body 38 is moved to the right side. 4B, the arm 36 is configured to face upward when the traveling body 38 is disposed at the right end position. Therefore, as shown in FIG. 4A, the back surface of the lithographic printing plate 12 is sucked by the suction plate 32 as shown in FIG. 4A, and the arm 36 is swung by running the running body 38, so that the lithographic printing plate as shown in FIG. 12 is turned off. The planographic printing plate 12 that has been turned off is sent out to a subsequent apparatus by rotationally driving the pair of transport rollers 42 and 42.

  Note that an arm 44 that rotates together with the arm 36 is attached to the traveling body 38, and a guide roller 46 is rotatably supported at the tip of the arm 44. Therefore, when the planographic printing plate 12 is turned off as shown in FIG. 4B, the planographic printing plate 12 can be guided by the guide roller 46, and the planographic printing plate 12 can be smoothly fed out.

  On the other hand, the suction disk 34 is attached to the lower end of the arm 48, and the arm 48 is configured to be lifted and lowered by a lifting means (not shown). As shown in FIG. 4B, the arm 48 is operated so as to move down after the planographic printing plate 12 is turned off by the suction plate 32, and the slip sheet 10 is sucked by the suction plate 34 at the lowered position. Then, by raising the arm 48 in this state, the end portion of the slip sheet 10 is lifted as indicated by a two-dot chain line. The lifted interleaving paper 10 is put into a collection container (not shown) by rotating the pair of transport rollers 50 and 50 and discarded.

  According to the plate supply device 30 configured as described above, an operation of adsorbing and turning off the planographic printing plate 12 by the adsorbing plate 32 and an operation of adsorbing and separating the interleaf paper 10 by the adsorbing plate 34 are alternately performed. By doing so, only the planographic printing plate 12 can be sent out to the subsequent apparatus.

  Next, the operation of the interleaf paper 10 and the laminated body 14 configured as described above will be described.

  When the planographic printing plate 12 is curved and turned off as shown in FIG. 4B, conventionally, the slip sheet 10 is fed out while adhering to the planographic printing plate 12, which may cause problems. When the inventor of the present invention investigated the cause, it became clear that it was caused by the curl value of the interleaf paper 10. That is, as the curl value of the slip sheet 10 increases, the slip sheet 10 is transported along the lithographic printing plate 12, and when the curl value becomes 30 mm or less, the slip sheet 10 can be prevented from being transported along the planographic printing plate 12. It was revealed.

  In the present embodiment, since the laminate 14 is formed using the interleaf paper 10 having a curl value of 30 mm or less, the interleaf paper 10 is attached to the lithographic printing plate 12 when the lithographic printing plate 12 is automatically conveyed. It can be prevented from being conveyed.

  The configuration of the plate supply apparatus 30 is not limited to the above-described one. For example, an apparatus (manufactured by Creo Inc.) that takes out the slip sheet 10 and the planographic printing plate 12 by alternately moving the suction plate and the picker. "LOTEM800V" etc.) may be used. In addition, as a means for taking out the interleaving paper, one that peels off the interleaving paper with a rubber roller, etc., a type that peels off the interleaving paper with an adsorption plate, a type that blows off the interleaving paper with wind pressure, etc. Also good. Furthermore, as a method for setting the laminate 14, an apparatus that places the photosensitive layer or heat-sensitive layer of the planographic printing plate 12 on top may be used. In any of the apparatus configurations, the influence of the curl value of the slip sheet 10 is less than that of the printing plate supply apparatus 30 shown in FIGS. 3A and 3B, and the curl value of the slip sheet 10 is reduced. By setting it to 30 mm or less, it is possible to reliably prevent the occurrence of defects.

  Next, a manufacturing apparatus for manufacturing the laminate 14 will be described. FIG. 5 is a side view schematically showing the configuration of the manufacturing apparatus 60 for the laminate 14.

  The manufacturing apparatus 60 shown in the figure uses a long web 62 which is a material of the planographic printing plate 12 (see FIG. 1) and a web 66 which is a material of the interleaf paper 10 (see FIG. 1). It is an apparatus for manufacturing a laminate 14 of a printing plate 12 and a slip sheet 10. The manufacturing apparatus 60 mainly includes a feeding unit 64 for feeding out the web 62, a feeding unit 68 for feeding out the web 66, a superposition unit 72 for superimposing the web 66 on the web 62 to form the contacted web 70, and the contacted web 70. A cutting unit 76 that obtains a sheet material 74 by cutting for each length, and a stacking unit 78 that accumulates the cut sheet material 74 in a bundle shape.

  The delivery unit 64 has a winding shaft 80 around which the web 62 is wound, and the winding shaft 80 is rotationally driven in the direction of the arrow by a rotation drive source (not shown), whereby the web 62 is sent out. The fed web 62 is guided by rollers 82, 82... And fed to the decurling device 84. The decurling device 84 is provided with a small-diameter decurling roller 86, and the curl of the web 62 is corrected by the decurling roller 86. The reference numeral in FIG. 5 is a joining portion 88, and the joining portion 88 joins the end of the web 62 to the tip of the next web 62 when the web roll is replaced.

  On the other hand, the delivery unit 68 is configured in substantially the same manner as the delivery unit 64, and has a winding shaft 90 that is rotated in the direction of the arrow by a rotation drive source (not shown), and is wound around the winding shaft 90 in a roll shape. A web 66 is mounted. The web 66 is delivered from the delivery unit 68 and conveyed to the curl correction unit 92. The curl correcting unit 92 includes a plurality of small-diameter rollers 94 around which the web 66 is wound, and the small-diameter rollers 94 are arranged so that the web 62 is wound at a wrap angle of a predetermined angle (for example, 90 °) or more. By correcting the curl of the web 66 by the curl correcting unit 92 configured as described above, the curl value of the manufactured interleaf paper 10 is controlled to 30 mm or less.

  The straightened web 66 is sent to the overlapping portion 72 and superimposed on the web 62. The overlapping portion 72 includes a pair of nip rollers 96 and 96, and the web 62 and the web 66 are brought into close contact with each other by the nip rollers 96 and 96. In addition, the superposition unit 72 includes a charging device 98, and the contact web 70 is charged by the charging device 98, and the web 62 and the web 66 are electrostatically adsorbed.

  A slitter device 100 is disposed downstream of the charging device 98. The slitter device 100 has a pair of slitter blades 102, 102, and the contact web 70 is cut into a predetermined width dimension by the slitter blade 102. Feed rollers 104 and 104 are disposed on the downstream side of the slitter device 100, and the contact web 70 is fed out by rotating the feed rollers 104 and 104.

  A cutting portion 76 is provided on the downstream side of the feed rollers 104 and 104. The cutting portion 76 includes blades 106 at the top and bottom, and the contact web 70 is cut at predetermined lengths by the blades 106 to form a sheet material 74. The sheet material 74 is obtained by bringing the planographic printing plate 12 and the interleaf paper 10 into close contact with each other, and is conveyed by the conveyance conveyor 108. The defective product of the sheet material 74 is discharged to the discharge unit 112 by the gate unit 110, while the non-defective product of the sheet material 74 is conveyed to the stacking unit 78.

  A stacking table 114 is provided in the stacking unit 78, and the sheet material 74 is stacked on the stacking table 114. Thereby, a laminate of sheet materials 74, that is, a laminate 14 in which the planographic printing plate 12 and the interleaf paper 10 are alternately laminated is formed. As described above, the laminate 14 is packaged and shipped in a necessary form with an interior paper, an exterior box, or the like.

  According to the manufacturing apparatus 60 described above, since the web 66 is superposed on the web 62 after the curl correction unit 92 corrects the curl of the web 66, the curl value of the manufactured interleaf paper 10 can be suppressed. The curl value of the interleaf paper 10 can be 30 mm or less.

Using five craft interleaving papers A to E having different curl values (basis weight 50 g / m ² , thickness 74 μm), a peeling test with an automatic peeling device was performed. The curl value was measured with a slip sheet immediately after packaging, and the humidity was adjusted to a temperature of 25 ° C. and a humidity of 25% for 24 hours in a 100 mm × 100 mm size, and the maximum value of four-side curl was obtained. The automatic peeling apparatus having the structure shown in FIGS. 4 (a) and 4 (b) was used, and it was examined whether or not the slip sheet was peeled when the planographic printing plate was conveyed. The results are shown in Table 1.

表１から分かるように、カール値が３０ｍｍを超える合紙を用いた場合には、平版印刷版の搬送時に合紙が剥離しながったが、カール値が３０ｍｍ以下の合紙を用いた場合には、合紙の剥離が確実に行われた。

As can be seen from Table 1, when a slip sheet having a curl value exceeding 30 mm was used, the slip sheet did not peel off during transportation of the planographic printing plate, but a slip sheet having a curl value of 30 mm or less was used. In some cases, the interleaving of the slip sheet was performed reliably.

The perspective view which shows the laminated body using the slip paper which concerns on this invention Side view for explaining a slip sheet according to the present invention The perspective view of the packaging form which packaged the laminated body of FIG. Schematic diagram showing the configuration of the plate supply device Schematic diagram of a manufacturing device that manufactures a laminate of planographic printing plates and slip sheets

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Interleaving paper, 12 ... Lithographic printing plate, 14 ... Laminated body, 16 ... Contact ball | bowl, 18 ... Interior paper, 30 ... Printing plate supply apparatus, 32, 34 ... Adsorption board, 36 ... Arm, 38 ... Running body, 40 ... Guide rails, 60 ... Print plate feeder

Claims (3)

In the interleaving paper for lithographic printing plates arranged between the lithographic printing plates to be laminated,
An interleaving paper for a lithographic printing plate having a curl value of 30 mm or less. In a lithographic printing plate laminate in which lithographic printing plates and lithographic printing plate slips are alternately laminated,
A lithographic printing plate laminate, wherein the interleaf for lithographic printing plate has a curl value of 30 mm or less. A planographic printing plate and a planographic printing plate slip sheet are formed by overlapping a long planographic printing plate web and a long slip sheet web, cutting the two overlapped webs in the width direction, and laminating them. In the manufacturing method of manufacturing a lithographic printing plate laminate with
A method of producing a curl value of a planographic printing plate interleaf of the lithographic printing plate laminate, wherein the curling value of the planographic printing plate laminate is reduced to 30 mm or less by curling the slip sheet web and superimposing the web on the planographic printing plate web.

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