JPH10194584A - Method and device for controlling attraction of web - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the peeling or deviation of a slip sheet by changing the voltage or the current of charging so that the optimum attraction necessary for the working can be obtained, and automatically controlling the attraction to eliminate the insufficient attraction. SOLUTION: When the high voltage is applied to a charging electrode 90, the electron is emitted from an electrode needle 96, a slip sheet web 20 is charged negative to be electrostatically attracted by a metallic web 10. A charging device 34 changes the charging current by the charging current command to be formed by a charging control device, and changes the charging quantity. The charging control device receives the data on the moving speed of the webs 10, 20, the data on the water content of the slip sheet web 20, the data on the relative humidity around the slip sheet web 20, the data on the kind of the photosensitive composition laminarly provided on the metallic web 10, and the data on the kind of the slip sheet web, determines the charging condition suitable for the working from the data table obtained from the operation or the experiment, and gives the command to the charging device 34 in the form of the charging current command.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for controlling a suction force of a web, and more particularly to a method for electrostatically suctioning a metal web such as a photosensitive lithographic printing plate transported in a longitudinal direction and an interleaf web. The present invention relates to a method and an apparatus for automatically controlling a suction force of a web at the time of the operation.

[0002]

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

[0003] In the processing of the PS plate, the photosensitive composition is brought into close contact with a metal web provided in a layered form while transferring the same, and further, the paper web is charged to electrostatically adsorb the metal web and the paper web. Let me. After suction, it is transferred to a cutting device and cut into sheets. The cut sheets are conveyed by a conveyor and are stacked while being slid in a stacking section. Charging is used to keep the metal web and interleaf web adsorbed during transport from cutting to stacking. The electrification intensity is determined manually by the operator based on observation of the operator or information on the adsorbing force obtained from the sample and manually adjusted.

[0004]

However, when charging the interleaf paper web, if the electrification is weak, there is a drawback that if the electrification is weak, the attraction force is insufficient and the interleaf is peeled off or slipped. Also,
If the charge is strong, there is a drawback in that, when the sheets are slipped and stacked, a brake is generated between the slip sheets and the stacked sheets, making the stacking impossible and causing irregularities, resulting in defective products.

[0005] The relationship between the strength of the charging and the strength of the attraction force is determined by the moving speed of the two webs, the width of the two webs, the water content of the interleaf web,
Relative humidity around both webs, adsorption efficiency according to the type of photosensitive composition provided in layers on metal web, adsorption efficiency according to type in interleaf web, type of photosensitive composition provided in layers on metal web It changes with the adsorption efficiency by the combination of the type of paper and the type of interleaf paper.

[0006] If the attraction force required for processing is obtained, the weaker the electrification, the less the occurrence of a brake during the accumulation while sliding, so that the accumulation is not possible or the irregularity does not occur. The electrification intensity is determined manually by the operator based on the observation of the operator and information on the adsorption force obtained from the sample, and is manually adjusted. However, it is difficult for the operator to accurately adjust the charge according to the judgment of the operator. Furthermore, the judgment cycle becomes long, and it cannot cope with the moving speed of the web and the moisture content of the interleaf web which change in a short time.

[0007] If the charging conditions are inappropriate, a trouble will occur in the line, the product yield will be reduced, and waste will be generated. In addition, the operation is reduced by stopping the line to recover from the trouble. Further, the productivity is low because the line is operated at a low speed until an appropriate charging condition is determined. An object of the present invention is to solve such a problem, and an object of the present invention is to provide a method and an apparatus for automatically controlling the suction force of a web to obtain a suction force required for processing.

[0008]

In order to achieve the above-mentioned object, the present invention relates to a line control device which provides data on the moving speed between a metal web and an interleaf web, data on the width of both webs, and near-infrared absorption. Water content data of the interleaf paper web provided by the applied near infrared moisture meter, data of the relative humidity around the interleaf web provided by the hygrometer, and the photosensitive layer provided on the metal web provided by the production management device. Data on adsorption efficiency by the type of photosensitive composition provided in layers on a metal web, obtained from data previously determined by experiments based on the type of photosensitive composition, and a slip-paper web provided by a production management device Of the adsorption efficiency by the type of interleaf web obtained from the data obtained in advance based on the type of the paper, and the photosensitivity provided in layers on the metal web provided by the production management device Adsorption by the combination of the type of photosensitive composition and the type of interleaf paper web provided in layers on a metal web obtained from data previously determined by experiments based on the type of product and the type of interleaf web Efficiency data, charging voltage or current so that the optimal adsorption force required for processing can be obtained using all or part of the charging efficiency data that changes due to contamination of the charging electrode obtained from the relationship between charging voltage and charging current. To automatically control the attraction force.

Further, in order to effectively utilize the attraction force after charging, at least one charging electrode is attached within 1 m from the cutting device to reduce attenuation of the attraction force. Furthermore, in order to measure the moisture content of the interleaf paper web, the moisture content is continuously and non-contactly measured using a reflection type near infrared moisture meter to which near infrared absorption is applied. In addition, in the automatic control section of the charging based on the data of the moving speeds of the two webs and the width of the two webs, the automatic control of the charging is performed so that the charge amount per unit area of the interleaf web becomes constant.

The charging efficiency that changes due to the contamination of the charging electrode is calculated from the relationship of the charging current.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of a method and an apparatus for controlling a suction force of a web according to the present invention will be described below in detail with reference to the accompanying drawings. FIG. 1 is a 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 rewinding device 16 having a winding shaft 14 around which a metal web 10 is wound, a rewinding device 24 having a winding shaft 22 around which an interleaf paper web 20 is wound, and a metal web. A nip roller 32 as a contact device for bringing the 10 and the interleaf web 20 into close contact, a charging device 34 for electrostatically adsorbing the metal web 10 and the interleaf web 20, and a metal web 10 and the interleaf web 20. The apparatus includes a cutting device 40 for cutting the adsorbed web into a predetermined length and processing it into a sheet material, and three conveyors 70, 70, 70 for conveying the sheet to a laminating device 76.

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. The decurling device 30 arranged close to the roller 18 includes:
A plurality of decurling rollers are provided. On the other hand, interleaf web 20
The rewinding device 24 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. Then, a roller 26 is provided.

A drying device 28 for the interleaf web 20 is provided between the rewind device 24 for the interleaf web 20 and the nip roller 32. Downstream of the drying device 28, a moisture content measuring device 52 for measuring the water content at the center of the interleaf paper web 20 is arranged. Downstream of the decurling device 30 is a metal web 10.
A nip roller 32 is disposed on the upper surface of the sheet as a contact device for contacting the interleaf web 20.

A pair of feed rollers 36 is disposed downstream of the nip roller 32. The feed rollers 36 are rotated by a drive motor (not shown) to
0 and 20 are conveyed. The slitter 38 disposed downstream of the feed roller 36 includes a pair of slitter blades for cutting the webs 10 and 20 into a predetermined width. On the downstream side of the slitter 38, a charging device 34 for electrostatically adsorbing the metal web 10 and the interleaf web 20 which are in close contact with each other is arranged.

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 driving 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 a device for electrostatically adsorbing the metal web 10 and the interleaf web 20, and is disposed between the slitter 38 and the cutting device 40. As shown in FIG. 2, the charging device 34 includes a high-voltage power supply 92 and 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. This charging needle 9
Reference numeral 6 designates a pointed end of the insulator 98 facing the interleaf paper web.
The two webs 10 and 20 are arranged at a pitch of mm in the width direction.

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 device 34 changes a charging current by changing a charging current according to a charging current command generated by the charging control device 42. Charging control device 4
2 is the two webs 10, 20 provided by the line controller 44.
, The data of the width of the two webs 10 and 20, the data of the moisture content of the interleaf web 20 provided by the moisture content measuring device 52 installed in the line, and the hygrometer 5 installed in the line.
0 provides relative humidity data around the interleaf paper web 20,
The data of the type of the photosensitive composition provided in layers on the metal web 10 provided by the production management device 46 and the data of the type of interleaf web provided by the production management device 46 are captured.
A charging condition suitable for processing is determined from a data table obtained by calculation or experiment, and a command is given to the charging device 34 in the form of a charging current command.

The line controller 44 supplies information to the charging controller 42 and controls the line. The production management device 46 supplies data necessary for determining charging to the charging control device 42 and data necessary for line control to the line control device 44. Next, the charging device 3 is charged in the form of a charging current command.
Two specific examples of controlling the charging current for giving an appropriate suction force between the metal web 10 and the interleaf paper web 20 by giving a command to the web 4 will be described.

First, as shown in FIG. 3, a first specific example is a metal web 10 classified based on the type of the photosensitive composition to be applied as an element affecting the adsorption efficiency.
And the relative data of the surroundings of the interleaf web 20 as parameters, the parameters comprising the type data of the interleaf web 20, the type data of the interleaf web 20, the moving speed data of the metal web 10 and the interleaf web 20, and the relative humidity data around the interleaf web 20. This is a method for controlling the charging current based on the four-dimensional data table 100.

The four-dimensional data table 100 generates a predetermined attraction force between the metal web 10 and the interleaf web 20, that is, an attraction force such that the interleaf web 20 does not peel off or shift from the metal web 10. The relationship between the four elements to be performed and the charging current value is obtained by calculation or experiment. Here, the label 1 of the four-dimensional data table 100
02, Posi-sps, Posi-spn, FNN-sps, FNN-
spn, Nega-sps, Nega-spn, Posi of FKT-sps, FNN, Ne
ga and FKT are classifications of the types of photosensitive compositions provided in layers on the metal web 10. FKT-spn means not processed. There are dozens of types of photosensitive compositions, and when these are classified from the viewpoint of charge control, the above four types are obtained, which is a difference in the types of binders that are the main components of the photosensitive composition. That is, Posi's binder means novolak, FNN's binder is urethane, Nega's binder is acrylic, and FKT means uncoated product without binder.

Also, Posi-sps, Posi-spn, FNN-sps, and the like displayed on the label 102 of the four-dimensional data table 100
FNN-spn, Nega-sps, Nega-spn, FKT-sps sps, spn
Is the classification of the type of interleaf web 20 and sps is the pulp 1
It means that the paper is 00% paper, and spn means that it is a mixed paper made by mixing polyethylene with pulp. Also, 4
The humidity displayed in the dimensional data table 100 is the relative humidity around the interleaf web 20 in the processing line. Since it is difficult to measure the water content of the interleaf paper web 20 in the control of the attraction force, the interleaf paper web 20 is used instead of the water content of the interleaf web 20.
Use the surrounding relative humidity.

Further, the line speed displayed in the four-dimensional data table 100 depends on the metal web 10 and the interleaf web 20.
Is the moving speed. Then, the charging current is controlled based on the created four-dimensional data table 100. Therefore,
According to the first specific example, charging for generating the above-mentioned predetermined suction force between the metal web 10 and the interleaf paper web 20 according to a combination example of the above four factors which affect the suction efficiency. Since the current value can be obtained immediately, it is possible to flexibly cope with a special situation.

In controlling the charging current with the four-dimensional data table 100, for example, even if the attraction force is unexpectedly increased due to discharge or the like, the four elements and the attraction force may be interposed. As long as there is reproducibility, a charging current value for obtaining an appropriate attraction force can be obtained based on the four factors, so that the attraction force can be controlled. Another advantage of controlling the charging current in the four-dimensional data table 100 is that even if a certain numerical value of the charging current value on the four-dimensional data table 100 is changed, the other numerical value is not affected.

In this case, when the width correction of the webs 10 and 20 and the operation correction performed by the operator's judgment are added to the charging current value obtained from the four-dimensional data table 100, a more appropriate suction force can be obtained. A charging current value can be obtained. Here, the web width correction is to increase or decrease the charging current according to the width of the interleaf web 20 (the same width of the metal web 10), and FIG. 4 shows the correction value of the web width. . The correction value can be obtained by calculating or experimenting the relationship between the width of the webs 10 and 20 and the suction efficiency. That is, the correction value of the web width is set to 1.0 (no correction) when the width of the webs 10 and 20 is 1000, and the width of the webs 10 and 20 is set to 780 to 800.
Is 0.8, and the width correction values of 1200 to 1640 are 1.2.

The operation correction is a correction made by the operator's judgment based on the observation of the suction state by the operator or the suction state of the sample.
It is to correct the difference of 0 moisture content. Interleaf web 2
The water content of 0 depends on the storage condition and storage period of the interleaf paper web 20 in the storage place, and the higher the water content, the weaker the adsorption power. Further, the operation correction is not performed for each interleaf web 20 but is determined based on the tendency of the moisture content of the interleaf web 20. That is, if the attraction force is weak, the operation correction value is increased to increase the charging current. Conversely, if the attraction force is strong, the operation correction value is reduced, and if the attraction force is within an appropriate range, the correction value at that time is used. Keep doing. Accordingly, the operation correction value changes each time the interleaf paper web 20 having a different storage state or storage period at the storage location is used. For example, in May and June, the operation correction value is in the range of 1.0 to 1.2. In July, it will be corrected in the range of 0.8 to 1.5. The reason why the operation correction value has a correction of 1.0 or less is that the setting of the charging current without correction may be set higher in advance in anticipation of a decrease in the attraction force.

Therefore, the charging current value to be controlled can be calculated by substituting the charging current value obtained from the four-dimensional data table into the following equation (1).

[0027]

## EQU00001 ## A charging current value of the four-dimensional data table.times.width correction value.times.operation correction value... (1) Next, a second specific example of controlling the charging current will be described. In the second specific example, as the factors affecting the adsorption efficiency, the type data of the metal web 10, the type data of the interleaf web 20, and the type of the metal web classified based on the type of the photosensitive composition to be applied. Four parameters including the moving speed data of the slip paper 10 and the slip web 20 and the relative humidity data around the slip web 20 are used as parameters. Also, select reference data from multiple data for each element,
In each of the selected reference data, a charging current value for generating the above-described predetermined attraction force is set as a reference current value. Then, the relative ratio of the adsorption efficiency of each of the plurality of data to the adsorption efficiency of the reference data for each element, that is, the metal web 10
A magnification for correcting a difference in charging current required to obtain a predetermined suction force is obtained by calculation or experiment, and a one-dimensional factor for each element is obtained. Create a data table.

Then, the charging current value is calculated by the following equation (2) using the reference current value and the magnification obtained from the created one-dimensional data table.

[0029]

## EQU2 ## Reference current value × magnification of metal web × magnification of interleaf web × magnification of moving speed × magnification of relative humidity... (2) The reference current value is a state of reference data previously selected for each element. Is a charging current value required to obtain the above-mentioned predetermined attraction force, for example, 150 μA.

FIGS. 5 to 8 are one-dimensional data tables for each element in which the magnification of the suction efficiency of each of a plurality of data with respect to the suction efficiency of the reference data is obtained. FIG. 5 is a one-dimensional data table 104 showing the magnification of the metal web. When the magnification is set to 1.0 using Posi data as reference data, FNN is 1.3, Nega is 1.5, and FKT is 3. It becomes 0.

FIG. 6 is a one-dimensional data table 106 showing the magnification of the interleaf web 20. When the magnification is set to 1.0 using the data of sps as reference data, spn is set to 0.
It becomes 7. FIG. 7 is a one-dimensional data table 108 showing the magnification related to the moving speed, where the moving speed is 0 to 5 (m /
Min) as reference data and a magnification of 1.0, 6 to 20 (m / min) becomes 1.2, 21 to 40 (m / min).
Min) is 1.5, 41-70 (m / min) is 2.0, 71-
100 (m / min) becomes 2.5.

FIG. 8 is a one-dimensional data table 110 showing magnifications related to relative humidity.
(%) As reference data and a magnification of 1.0, 3
1.5 for 3-34 (%), 2. for 37-38 (%).
It becomes 3.8 at 1, 45 to 46 (%). In addition, in the case of the second specific example, similarly to the case of the first specific example, when the width correction and the operation correction of the webs 10 and 20 are added to the above four elements, the charging for obtaining a more appropriate suction force is performed. The current value can be obtained.

The charging current value to be controlled in this case is calculated by the following equation (3).

[0034]

## EQU3 ## Reference current value × magnification of metal web × magnification of interleaf web × magnification of moving speed × magnification of relative humidity × web correction × operation correction (3) Therefore, according to the second specific example, For example, since the number of data necessary for calculating the charging current value is small, it is possible to easily manage the charging current value for obtaining a predetermined attractive force. For example, when a new interleaf web 20 is used, only the magnification of the new interleaf web 20 needs to be added. Further, since the moving speed and the width correction of the webs 10 and 20 can be theoretically replaced by a calculation formula, a charging current value can be easily obtained, and smooth control can be performed.

If the above-described four-dimensional data table or one-dimensional data table is incorporated in, for example, production management software of a computer used in the production management device 46, the optimum charging current can be automatically set. . [Description of Materials] PS for planographic printing as metal web 10
Use plate. The PS plate uses a thin aluminum plate (JIS alloy number 1050) and a thickness of 0.2 mm as a support. The PS plate is provided with a photosensitive composition on this support. The width of the interleaf paper is the same as that of the metal web, the thickness is 0.05 mm, and the grammage is 35 g / m ² . [Processing conditions] As processing conditions, the diameter of the decurling roller constituting the decurling device 30 is set to 60 mm. The cutting length of the sheet material 12 cut by the cutting device 40 is set to 11
The conveyor speed is set to 20 mm and the conveyor speed to 130 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 1500 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. [Processing Method] After the metal web 10 and the interleaf paper web 20 are brought into close contact with each other by a nip roller 32, they are slit into a predetermined length by a slitter device 38 and electrostatically attracted by a charging device 34. The sheet is cut into a length of 1120 mm by the cutting device 40 and processed into the sheet 12. The sheet 12 is accelerated to 100 m / min by the conveyor device 70 and is fed into the laminating device 76.

The moving speed of both webs 10 and 20 is 5 to 70 m.
/ Min, width of web 10 and 20 1030mm and 1310m
m, the moisture content of the interleaf paper web 20 is 3 to 4.5%, the relative humidity around the web is 30 to 45%, and two kinds of photosensitive compositions provided in layers on the metal web 10 (Fuji Photo Film, PS plate) FPQ-J (similar to JP-A-63-58440)
And FND-A3 (similar to JP-A-62-38471)),
When processing was performed using two kinds of interleaf paper webs (natural paper of 100% natural pulp and synthetic paper obtained by mixing 10% by weight of polyethylene with natural pulp), a stable adsorption force required for processing was obtained. However, even if the charging is adjusted from a point where the relative humidity exceeds 42%, a predetermined attractive force is not obtained, and slippage of the slipsheet or slippage of the slipsheet may occur.

In this state, the charged electrode is connected to the upstream side 3 of the cutting device.
When it is moved to 00 mm, splintering peeling or slippage slippage which has been sporadic disappears, but if it exceeds 44%, slipping paper slippage or slippage slippage again occurs sporadically. In the above, the charging control device gives a command to the charging device with the charging current.In this case, even if the electrodes become dirty and the current becomes difficult to flow, the charging device automatically increases the charging voltage to make a correction. Therefore, it is not necessary to consider a change in charging efficiency due to contamination of the charging electrode.

On the other hand, when the charging control device gives a command to the charging device with the charging voltage, the charging efficiency that changes due to contamination of the charging electrode is determined from the relationship between the charging voltage and the charging current, and the charging voltage command is taken into account. By applying a charging voltage command, a stable suction force required for processing was obtained.

[0040]

As described above, according to the method and the apparatus for controlling the attraction force of the web according to the present invention, the moving speed of the two webs, the width of the two webs, the water content of the interleaf web, and the relative speed around the two webs. Humidity, adsorption efficiency by the type of photosensitive composition provided in layers on the metal web, adsorption efficiency by type of interleaf web, type of photosensitive composition provided in layers on the metal web, and Since the charging is automatically controlled by always seeking the optimum charging strength from the suction efficiency by the combination of the types, the shortage of the suction force is eliminated, and the slip sheet can be prevented from being peeled or shifted. In addition, it is possible to prevent the charging from being excessively strong, and to prevent the occurrence of a brake during the accumulation, which makes the accumulation impossible, and the occurrence of irregularities.

Thus, according to the present invention, in-line trouble is reduced, product yield is improved, and waste is also reduced. In addition, since the trouble is reduced, the operation is improved, and the appropriate charging condition is quickly determined, so that the low-speed operation time is shortened and the productivity is improved.

[Brief description of the drawings]

FIG. 1 is a structural view of a web cutting apparatus to which a method for controlling a suction force of a web according to the present invention is applied.

FIG. 2 is a structural diagram of a charging device applied to the web cutting device shown in FIG. 1;

FIG. 3 is a table diagram of a four-dimensional data table applied to a method for controlling a suction force of a web according to the present invention.

FIG. 4 is a table showing a relationship between a web width and a correction value applied to the method for controlling a web suction force of the present invention.

FIG. 5 is a table relating to a metal web of a one-dimensional data table applied to the method for controlling a web attraction force of the present invention.

FIG. 6 is a table relating to a slip sheet web of a one-dimensional data table applied to the method for controlling a suction force of a web according to the present invention.

FIG. 7 is a table relating to a moving speed of a one-dimensional data table applied to the method for controlling a suction force of a web according to the present invention.

FIG. 8 is a table showing a relative humidity of a one-dimensional data table applied to the method for controlling a suction force of a web according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Metal web 20 ... Interleaf web 28 ... Drying device 34 ... Charging device 42 ... Charging control device 44 ... Line control device 46 ... Production management device 100 ... 4D data table

Claims (11)

[Claims] 1. A method for controlling a suction force of a web for charging and electrostatically attracting a metal web and an interleaf web, wherein the attraction force is automatically controlled to attract the metal web and the interleaf web. Method of controlling the suction force of the web to perform. 2. The method according to claim 1, wherein the attraction force is controlled by a charging voltage.
The moving speed of the metal web and the interleaf paper web, the width of the metal web and the interleaf web, the moisture content of the interleaf web, the relative humidity around the metal web and the interleaf web, and provided in layers on the metal web Adsorption efficiency according to the type of photosensitive composition, adsorption efficiency according to the type of interleaf paper web, adsorption efficiency according to the combination of the type of photosensitive composition provided in layers on the metal web and the type of interleaf paper, charging of the charging electrode 2. The method according to claim 1, wherein all or part of the variation in efficiency is used for control. 3. The method according to claim 1, wherein a change in the charging efficiency of the charging electrode is calculated from a relationship between a charging voltage and a charging current. 4. The method of claim 1, wherein the relative humidity around the interleaf web is set to 42% or less to electrostatically adsorb the metal web and the interleaf web. Control method. 5. The method according to claim 1, wherein the attraction force between the metal web and the interleaf paper web is controlled by a charging current, the moving speed between the metal web and the interleaf paper web, the width between the metal web and the interleaf paper web, and the water content of the interleaf web. Rate, relative humidity around metal web and interleaf paper web, adsorption efficiency by type of photosensitive composition provided in layers on metal web, adsorption efficiency by interleaf web type,
2. The method according to claim 1, wherein all or a part of the adsorption efficiency according to the combination of the type of the photosensitive composition and the type of the interleaf web provided in layers on the metal web is used for control.
A method for controlling the attraction force of a web as described in the above. 6. Among the factors affecting the adsorption efficiency,
Type data of the metal web classified based on the type of the photosensitive composition to be applied, type data of the interleaf web, movement speed data of the metal web and the interleaf web, and the interleaf Relative humidity data around the web,
And at least parameters obtained by calculating or experimenting the relationship between the four elements for generating a predetermined attraction force between the metal web and the interleaf paper web and a charging current value. The method according to claim 5, wherein the charging current is controlled based on the data table. 7. Among the factors affecting the adsorption efficiency,
Type data of the metal web classified based on the type of the photosensitive composition to be applied, type data of the interleaf web, movement speed data of the metal web and the interleaf web, and the interleaf Relative humidity data around the web,
At least four elements are used as parameters, and reference data is selected from a plurality of data for each of the elements, and a predetermined distance between the metal web and the interleaf paper web is selected in each of the selected reference data. A charging current value for generating an attraction force is defined as a reference current value, and a relative ratio of each of the plurality of data to the attraction efficiency with respect to the attraction efficiency of the reference data is obtained by calculation or experiment to create a data table for each element, The method according to claim 5, wherein the charging current is controlled by taking into account the relative ratio of the data table for each element to the reference current value. 8. An apparatus according to claim 6, wherein said elements include web width data and data determined by an operator.
Or a method for controlling an attraction force according to claim 7. 9. The water content of the interleaf web, the relative humidity of the metal web and the periphery of the interleaf web, the adsorption efficiency by the type of photosensitive composition provided in layers on the metal web, the type of interleaf web When the adsorption efficiency by the combination of the type of photosensitive composition and the type of interleaf paper provided in layers on the metal web is constant, the moving speed between the metal web and the interleaf web, 6. The method according to claim 2, wherein the charge amount per unit area of the interleaf web is kept constant regardless of the width of the interleaf web. 10. A control apparatus for controlling a suction force of a web for charging a metal web and an interleaf paper web and electrostatically adsorbing the metal web and the interleaf web. A device for controlling the attraction force of a web, wherein one charging electrode is installed within 1 m from a device for cutting a metal web and an interleaf web. 11. The web according to claim 10, wherein a water content of the interleaf paper web is measured by using a reflection type near infrared moisture meter which can perform non-contact measurement by applying near infrared absorption of water. Control device of the suction force.