JPH1191999A - Method and device for adsorbing web - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a web adsorbing method to reduce a fraction defective pertaining to adsorption of a metallic web and a slip sheet web. SOLUTION: By laminating together a metallic web 10 and a slip sheet web 20, a lump of air entering a gap between the two webs is removed through the gap between the two webs or immobile fixing to the two webs is effected. Or by preventing entrance of air to a gap between the two webs during lamination, no bending is formed at a slip sheet web 20 by a feed roller 36 part.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for adsorbing a web, and more particularly to a method for adsorbing a metal web such as a photosensitive lithographic printing plate transported in a longitudinal direction and an interleaf paper web electrostatically. It is about the method.

[0002]

2. Description of the Related Art For example, a thin metal plate such as an aluminum plate is used as a support in a PS plate for lithographic printing, and a photosensitive composition is provided in a layer on the support. Generally, a slip sheet is electrostatically adsorbed on a product which is stored in a cardboard box and shipped to protect the photosensitive composition.

[0003] In the processing of the PS plate, the interleaf web is sandwiched between a pair of upper and lower rollers while transferring the interleaf web to a metal web provided with a layer of the photosensitive composition, and the entire surface of the interleaf web is negatively charged. The metal web and the interleaf web are electrostatically attracted. At this time, at least one of the pair of upper and lower rollers used is a crown roller. The web that has been electrostatically attracted is nipped and transported by a feed roller to a cutting device and cut into a sheet. The cut sheets are conveyed by a conveyor and are stacked while being slid in a stacking section.

By the way, when the metal web and the interleaf paper web are overlapped by a pair of rollers as described above, a lump of air entering between the metal web and the interleaf paper web is formed and is conveyed together with the overlap web. Then, FIG.
As shown in (e), when the overlapping web passes through the feed roller section, only the web passes and the air mass stays,
It absorbs the air mass transported later and grows large.
The grown mass of air collapses when it reaches its limit. When the air mass collapses, the interleaf web breaks and partially overlaps,
Passing through the feed roller.

[0005]

However, the folds in the interleaf paper web cause a flaw in the PS plate when it is accumulated, causing a product defect. Furthermore, when a product defect occurs, the yield decreases and waste is generated, and the operation is reduced by stopping the line to remove the defective product.

The present invention has been made in view of such circumstances, and a fold is generated in the interleaf web even when the electrostatically attracted metal web and interleaf web are nipped and transported by a pair of transport rollers. Therefore, an object of the present invention is to provide a method and an apparatus for adsorbing a web which can eliminate product defects.

[0007]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a method in which a metal web and an interleaf web are overlapped by a pair of transport rollers for pinching and transporting the web. In the method of adsorbing the metal web and the interleaf paper web with an electrostatic attraction force by charging the overlapped web with charging means, the charging strength of the overlapped web is determined by the overlapping. The air mass is moved between the metal web and the interleaf web so that the air mass that has entered between the metal web and the interleaf web passes through the pair of transport rollers without stagnation. Wherein the electrostatic attraction force that can be fixed to the web is a strength that is generated on the overlapped web.

[0008] In order to achieve the above object, the present invention provides a method in which a stacked web in which a metal web and an interleaf web are stacked is sandwiched and conveyed by a pair of conveying rollers, and the stacking web is provided upstream of the conveying rollers. In a method of adsorbing the metal web and the interleaf paper web by electrostatic attraction force by charging the web with charging means, air entering between the metal web and the interleaf web by the superposition is provided. Is characterized in that the lump is subdivided and then charged on the overlapped web.

Further, in order to achieve the above object, the present invention provides a method in which a stack of a metal web and an interleaf paper web is sandwiched and transported by a pair of transport rollers. In the method of adsorbing a web in which the metal web and the interleaf web are adsorbed by an electrostatic attraction force, the superposition of the metal web and the interleaf web is performed by using a flat roller having a smooth surface, and a flat roller. On the other hand, the interleaving paper web is sandwiched between the metal web conveyed by pressure contact with the metal web.

Further, in order to achieve the above object, the present invention provides a method in which a superposed web in which a metal web and an interleaf paper web are superposed is sandwiched and conveyed by a pair of conveying rollers. In the method of adsorbing the metal web and the interleaf paper web by electrostatic attraction force, the overlapping web is handled on the upstream side of the pair of transport rollers.

Further, in order to achieve the above object, the present invention provides a method in which a stacked web of a metal web and an interleaf web is sandwiched and transported by a pair of transport rollers, and the transported web is charged by a charging means during transport. In the method of adsorbing the metal web and the interleaf paper web by electrostatic attraction, a method of handling the overlapped web from the center to the side at an upstream side of the pair of transport rollers is performed. Features.

Further, in order to achieve the above object, the present invention provides a method in which a stacked web of a metal web and an interleaf paper web is sandwiched and transported by a pair of transport rollers, and the overlapping web is provided upstream of the transport rollers. In a method of adsorbing the metal web and the interleaf paper web with an electrostatic attraction force by charging the web with a charging means, the charging means sequentially charges the center of the overlapped web outward. It is characterized by.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of a method and an apparatus for adsorbing a web according to the present invention will be described below in detail with reference to the accompanying drawings. FIG. 1 is a basic configuration diagram of a web cutting apparatus to which the present invention is applied. This apparatus is for processing a PS plate, and includes a winding shaft 14 around which a metal web 10 is wound.
, A rewinding device 24 having a winding shaft 22 around which the interleaf web 20 is wound, a nip roller 32 as a device for superimposing the metal web 10 and the interleaf web 20, and a metal web 10. A charging device 34 for electrostatically adsorbing the interleaf web 20; a cutting device 40 for cutting the web adsorbing the metal web 10 and the interleaf web 20 into a predetermined length to process the sheet into a sheet material; Conveyors 70, 70, 70 for transporting the
And

The rewinding device 16 for the metal web 10 is provided with a rotary drive source (not shown) for rotating the winding shaft 14 in the direction of the arrow to feed the metal web 10. 18 are provided. Decaling device 30 arranged close to this roller 18
Has a plurality of decal rollers. On the other hand, the rewinding device 24 for the interleaf web 20 is provided with a rotation drive source (not shown) for rotating the winding shaft 22 in the direction of the arrow and sending out the interleaf web 20 similarly to the rewinding device 16. A roller 26 is provided near the rewinding device 24.

A drying device 28 for the interleaf web 20 is interposed between a rewinding device 24 for the interleaf web 20 and a nip roller 32.
It has. Downstream of the nip roller 32, a charging device 34 for electrostatically adsorbing the superposed metal web 10 and interleaf web 20 is disposed. Charging device 34
A pair of feed rollers 36 is disposed downstream of the feed roller 36. The feed rollers 36 are rotated by a drive motor (not shown) to pinch and transport the webs 10 and 20.
The slitter 3 disposed downstream of the feed roller 36
Reference numeral 8 includes a pair of slitter blades for cutting the webs 10 and 20 into a predetermined width.

The cutting device 40 has an upper blade and a lower blade, and cuts both the webs 10 and 20 to a predetermined length while moving forward and backward in a conveying direction via a drive unit including a motor (not shown). The cut webs 10 and 20 are formed into a sheet shape, and
0 and are stacked on the stacking device 76. The stacking device 76 stacks the sheets 12 sequentially fed from the conveyors 70, 70, 70 with the side stoppers (not shown) with the side surfaces of the sheets aligned. The apparatus includes a buffering device 80 for buffering, and a sheet trailing end stopper 78 provided with a means for ejecting air in a direction of the injection.

The charging device 34 is provided between the nip roller 32 and the feed roller 36 and electrostatically attracts the superposed metal web 10 and interleaf web 20. As shown in FIG. 2, the charging device 34 includes a high-voltage power supply 92, a charging electrode 90, and a high-voltage cable 94 connecting them. The charging electrode 90 includes a charging needle 96 and an insulator 98. The charging needle 96 is made of stainless steel having a diameter of 3 mm and a length of 15 mm and one end of which is sharp. The charging needles 96 are arranged in the width direction of the two webs 10 and 20 at a pitch of 20 mm, with the tip pointed to the insulator 98 facing the interleaf web.

When a high voltage is applied to the charging electrode 90, the electrode needle 9
Electrons are emitted from 6, and the interleaf web 20 is negatively charged and electrostatically adsorbs to the metal web 10. The charging voltage 34 controls charging by a charging current command generated by the charging control device 42. Specific examples of the materials and processing conditions in the above basic configuration are as follows. [Description of Materials] A PS plate for lithographic printing is used as the metal web 10. The PS plate is a thin aluminum plate (JIS alloy number 105) as a support.
0), width 1310, thickness 0.2 mm, and length 5000 m. The PS plate is provided with a photosensitive composition on this support. 100% natural pulp, width is the same as metal web, thickness 0.05mm, length 1000
0 m and a basis weight of 35 g / m ² are used. [Processing conditions] As processing conditions, the distance between the slitter blades is set so that the diameter of the decurling roller constituting the decurling device 30 is 60 mm, and the width of the web 10 after being cut by the slitter device 38 is 1300 mm. The cutting length of the sheet material 12 cut by the cutting device 40 is set to 1120 mm, and the conveyor speed is set to 100 m / min.

Further, the diameter of the nip roller 32 on the downstream side of the decurling device is set to 250 mm, and the charging electrode 90 is mounted at a position of 500 mm on the upstream side of the cutting device 40.
The height from the web to the tip of the electrode needle 96 of the charging device 34 is set to 25 mm. The moisture content of the interleaf web is 3% ~
4.8%, the humidity around the interleaf web is 30% ~ 45%
And Web moving speed is 5m / min to 70m / m
in.

In the above basic configuration, FIGS.
As shown in (e), the metal web 10 and the interleaf web 2
By superimposing 0, the lump of air 50 that has entered between the metal web 10 and the interleaf web 20 is stagnated when passing through the feed roller 36, causing the interleaf web 20 to fold. The fold was a factor that damaged the PS plate.

Therefore, in the first embodiment of the present invention,
As the charging strength of the charging device 34 described in the basic configuration, when the stacked webs are nipped and conveyed by the feed roller 36, an electrostatic attraction force such that the interleaf web 20 does not peel off or shift from the metal web 10 is obtained. For this purpose, a stronger charging than the usual strength is performed on the overlapping web for a short time. That is, the air mass 50 that has entered between the metal web 10 and the interleaf paper web 20 due to the superposition can pass through the feed roller 36 without stagnation at the position of the feed roller 36. 50 is a charging strength that obtains an electrostatic attraction force that can be fixed between the metal web 10 and the interleaf paper web 20. For example, the charging current for obtaining the normal charging strength is 0.6 mA, but in the first embodiment of the present invention, the charging current of 3 mA, which is five times the normal charging current, is applied for 10 seconds. To charge.

According to the first embodiment configured as described above, since a strong suction force greater than the suction force required for processing the web acts, the air mass 50 interposed between the two webs has the strong suction force. It is fixed between the webs by the suction force. Thereby, the air mass 50 is conveyed downstream together with the web as shown in FIGS. 4A to 4E without being stopped by the feed roller 36. Therefore, the interleaf web does not form a fold. The reason for setting the charging time to be as short as 10 seconds or less is that if strong charging is continued as it is, a brake will be generated during the accumulation while sliding in the accumulation section, and a trouble will occur in the accumulation section.

The charging device 34 is preferably provided immediately after the nip roller 32 for superposing the metal web 10 and the interleaf paper web 20 on each other. That is, the air mass 50 is
Immediately after the two webs are overlapped, air interposed between the two webs collects. Therefore, if the charging device 34 is installed immediately downstream of the nip roller 32 and electrostatically adsorbs immediately after the two webs are superimposed, the air interposed between the webs remains in a small mass before forming a large mass. This is because the effect of being more difficult to stay is obtained.

FIG. 5 is a side view showing a main part of a second embodiment of the present invention. That is, the flat roller 8 having a smooth surface is provided below the charging electrode 90 described in the basic configuration.
2 when the charging device charges the overlapping web, the overlapping web is conveyed while being pressed against the flat roller 82. In order to press the overlapped web against the flat roller 82, as shown in FIG. 5, the contact angle θ of the web contacting the upper surface of the flat roller 82 is 2 ° with respect to the horizontal tangent line on the upper surface of the flat roller 82.
It is preferable that the angle be 30 degrees.

According to the second embodiment configured as described above, the air mass 50 interposed between the superposed metal web 10 and the interleaf paper web 20 is formed on the flat roller 82 by the interleaf web. With the tension of 20, the feed roller 3
6 and crushed to a size that does not block. In this state, the interleaf web 20 is charged and adheres to the metal web 10, so that
The air mass is fixed between the two webs with a fine size, and passes through the feed roller 36 without interruption. Therefore, the interleaf web 20 does not form a fold.
The contact angle θ is set to 2 to 30 degrees. When the contact angle θ is 2 degrees or less, the tension of the interleaf paper web 20 is too weak and the air mass 50 does not stay on the feed roller 36. And the contact angle θ is 30
Degrees or more, the tension of the metal web 10 increases,
This is because the metal web 10 is damaged.

FIG. 6 is a side view showing a main part of a third embodiment of the present invention. That is, a single flat roller 84 is provided on the slip sheet web side instead of the nip roller 32 as the superposing device described in the above basic configuration. Then, the superposition of the metal web and the interleaf paper web is performed by using a flat roller 84 and the metal web 10 pressed against the flat roller 84 to form the interleaf web 20.
To be carried out. Metal web 10
6 is pressed against the flat roller 84 as shown in FIG.
It is preferable that the contact angle γ of the metal web contacting the lower surface of the flat roller 84 is 10 degrees or more with respect to the horizontal tangent to the lower surface of the flat roller 84 as shown in FIG.

According to the third embodiment configured as described above, the interleaf paper web 20 is superposed on the metal web 10 while being sandwiched between the metal web 10 and the flat roller 84 by the metal web 10. . When the contact angle γ of the metal web increases, the area where pressure acts on the metal web 10 in the direction of the center of the flat roller 84 increases, and the force for sandwiching the interleaf web 20 increases, so that air is less likely to intervene between the two webs. Become. Therefore, it is possible to prevent the generation of the air mass 50 that is stagnant at the feed roller 36, and the interleaf web 20 does not have any folds.

FIG. 7 is a side view showing a main part of a fourth embodiment of the present invention. That is, a flat roller 86 having a smooth surface is arranged between the charging electrode 90 and the nip roller 32 described in the above basic configuration.
In step 6, the overlapped web is treated and then charged.

According to the fourth embodiment configured as described above, the superposed metal web 10 and interleaf web 20
Is flattened by the flat roller 86, and the air mass 50 interposed between the two webs is expelled out of the web by the flat roller 86 and disappears. Since the web is charged without air between the two webs, stable charging can be achieved. Therefore, the interleaf paper web 20 is fed by the feed roller 36.
But do not make folds.

FIG. 8 is a side view showing a main part of a fifth embodiment of the present invention, and FIG. 9 is a top view of a grooved roller according to the fifth embodiment. Feed roller 3
6, a grooved roller 88 having a spiral groove extending from the center to the side is installed on the surface, and the grooved roller 88 is used to move the surface of the overlapping web 10 side of the overlapping web from the center to the side. The charging electrode 9
This is an example in which a grooved roller 88 is provided between the nip roller 32 and the nip roller 32.

According to the fifth embodiment configured as described above, the air mass 5 interposed between the superposed webs 5
0 is efficiently driven out of the web by the spiral groove of the grooved roller 88 and disappears. Therefore,
The interleaf paper web 20 does not fold at the feed roller 36. FIG. 10 is a top view showing a main part of the sixth embodiment of the present invention. That is, the shape of the charging electrode 90 of the charging device 34 described in the above basic configuration is V-shaped as shown in FIG.

According to the sixth embodiment configured as described above, with the shape of the charging electrode 90, the superposed metal web 10 and interleaf web 20 are charged from the center toward the side. Since the air is adsorbed, the air mass 50 interposed between the two webs gradually moves outward, is expelled from the superposed web and disappears. Therefore, the interleaf paper web 20 does not fold at the feed roller 36.

Each of the above-described six embodiments has an effect of preventing the break of the interleaf web 20 at the feed roller 36 portion. However, by combining a plurality of embodiments, a higher effect can be obtained. The effect can be obtained.

[0034]

As described above, according to the method and apparatus for adsorbing a web according to the present invention, a lump of air generated when a metal web and an interleaf paper web are overlapped is expelled from between the two webs. You can fix it between webs,
Alternatively, by preventing air from entering between the two webs at the time of overlapping, it is possible to suppress the occurrence of folds in the interleaf web, thereby preventing the occurrence of product defects.

[Brief description of the drawings]

FIG. 1 is a basic configuration diagram of a web cutting apparatus to which the present invention is applied.

FIG. 2 is a configuration diagram of a charging device applied to the web cutting device shown in FIG.

FIG. 3 is an explanatory view for explaining an aspect in which a fold is formed in an interleaf paper web;

FIG. 4 is an explanatory diagram illustrating aspects of a mass of air according to the first embodiment of the present invention.

FIG. 5 is a side view showing a main part of the second embodiment of the present invention.

FIG. 6 is a side view showing a main part of a third embodiment of the present invention.

FIG. 7 is a side view showing a main part of a fourth embodiment of the present invention.

FIG. 8 is a side view showing a main part of a fifth embodiment of the present invention.

FIG. 9 is a top view of a grooved roller according to a fifth embodiment of the present invention.

FIG. 10 is a top view showing a main part according to a sixth embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Metal web 20 ... Interleaf web 32 ... Nip roller 34 ... Charging device 36 ... Feed roller 50 ... Air lump 90 ... Charging electrode

Claims (10)

[Claims] 1. A metal web and an interleaf web are overlapped by a pair of transport rollers for nipping and transporting the overlapped web, and the metal web is charged by charging means upstream of the transport rollers by charging means. In a method of adsorbing a web and the interleaf web with an electrostatic attraction force, the charging strength of the superposed web is determined by the air entering between the metal web and the interleaf web by the superposition. An electrostatic attraction force capable of fixing the air mass between the metal web and the interleaf web is generated on the overlapped web so that the mass of air passes through the pair of transport rollers without stagnation. A method for adsorbing a web, the method comprising: 2. A metal web and an interleaf web are superimposed on each other by sandwiching and transporting a superposed web by a pair of transport rollers, and the metal web is charged by a charging means on the upstream side of the transport rollers. In the method of adsorbing a web and the interleaf web with an electrostatic attraction force, a web of air that has entered between the metal web and the interleaf web by the superimposing is subdivided, and then the web and the interleaf web are separated. A method for adsorbing a web, comprising performing charging. 3. A metal web and an interleaf web are superimposed on each other by sandwiching and transporting the superposed web by a pair of transport rollers, and the superposed web is charged by charging means upstream of the transport rollers. In a web suction device for suctioning a web and the interleaf web with an electrostatic suction force, a flat roller having a smooth surface is provided below the charging means, and when the charging web is charged by the charging means, An apparatus for adsorbing a web, wherein the web is pressed against the flat roller. 4. A method in which a metal web and an interleaf paper web are overlapped with each other and sandwiched and transported by a pair of transport rollers.
In the method of adsorbing the metal web and the interleaf paper web by electrostatic attraction by charging the superimposed web with a charging unit during conveyance, the superimposition of the metal web and the interleaf paper web is performed when the surface is overlaid. A method for adsorbing a web, which is performed by sandwiching the interleaf web between a smooth flat roller and the metal web pressed and conveyed to the flat roller. 5. A stacked web in which a metal web and an interleaf web are overlapped and nipped and transported by a pair of transport rollers.
In the method of adsorbing the metal web and the interleaf paper web by electrostatic attraction force by charging the overlapped web with a charging unit during conveyance, the method includes: handling the overlapped web upstream of the pair of conveyance rollers. A method for adsorbing a web, comprising: 6. A lapping web in which a metal web and an interleaf web are laid on each other is sandwiched and transported by a pair of transport rollers, and
In a web suction device in which the metal web and the interleaf web are suctioned by an electrostatic suction force by charging the overlapped web by a charging unit during transfer, a flat surface having a smooth surface is provided upstream of the pair of transfer rollers. An apparatus for adsorbing a web, wherein a roller is disposed and the overlapped web is handled by the flat roller. 7. A stacked web in which a metal web and an interleaf web are overlapped is nipped and transported by a pair of transport rollers, and
In the method of adsorbing the metal web and the interleaf paper web with electrostatic attraction force by charging the overlapped web with a charging unit during conveyance, the stacking web is centered on the upstream side of the pair of conveyance rollers. A method of adsorbing a web, characterized in that the web is handled from the side to the side. 8. A stacked web in which a metal web and an interleaf web are overlapped and nipped and transported by a pair of transport rollers.
In a web suction device for adsorbing the metal web and the interleaf paper web with an electrostatic attraction force by charging the overlapped web by a charging means during conveyance, an upstream side of the pair of conveyance rollers, a surface from a center to a side. A suction device, comprising a roller having a spiral groove directed to a side, wherein the roller handles a surface of the overlapped web on the side of an interleaving web. 9. A metal web and an interleaf web are overlapped and sandwiched and transported by a pair of transport rollers, and at the upstream side of the transport rollers, the overlay web is charged by a charging means. A method of adsorbing a web and an interleaf web with an electrostatic attraction force, wherein the charging means sequentially charges the overlapping web from the center to the outside of the web. 10. A metal web and an interleaf web are overlapped and sandwiched and transported by a pair of transport rollers, and the overlay web is charged by charging means on the upstream side of the transport rollers. In a web suction device for adsorbing a web and the interleaf web with an electrostatic attraction force, a charging electrode of the charging means is formed in a V-shape, and a V-shaped top of the charging electrode is in a transport direction of the overlapped web. A web suction device, which is disposed so as to face the web.