JPH10175765A - Metal web and laminated paper web sucking method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a charging method which prevents laminated paper from being peeled off or shifted due to lack of sucking force even when the adjustment of charging is not precise and also prevents the accumulation or irregular positioning of paper from occurring due to braking produced between the laminated paper already accumulated because charging is too strong during the accumulation. SOLUTION: When sucked metal web 10 and laminated paper web 20 are cut in rectangular sheets 12, the metal web 10 and laminated web 20 are charged so that at least two side parts opposed to each other among the side parts of the sheets 12 can be charged or, when the sucked metal web 10 and laminated paper web 20 are cut in rectangular sheets 12, the metal web 10 and laminated paper web 20 are charged so that the four corner parts of the sheets 12 can be charged.

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 metal web and an interleaf paper web, and more particularly to an adsorbing method for electrostatically adsorbing a metal web such as a photosensitive lithographic printing plate and the interleaf paper web.

[0002]

2. Description of the Related Art A photosensitive lithographic printing plate PS plate (Pre-Sensit
The abbreviation for ized plate is used by coating a photosensitive composition in layers on a metal support such as an aluminum plate.
When many PS plates are stored in a cardboard box for shipment, a slip sheet is inserted between the PS plates to protect the photosensitive composition.

[0003] A web cutting apparatus for manufacturing such a PS plate is disclosed in Japanese Patent Application Laid-Open No. 61-241096, and a metal web roll in which a metal web (PS plate) is wound in a coil shape, an interleaf paper. And an interleaf web roll on which the web is wound. According to this web cutting device, the metal web unwound from the metal web roll is charged by the charging device, and the interleaf web unwound from the interleaf web roll is negatively charged by the charging device. An interleaf web is supplied thereon and electrostatically attracted to each other. The adsorbed metal web and interleaf web are
After being sandwiched and brought into close contact by a pair of nip rollers, the sheet is cut into a sheet having a predetermined length by a cutter. Then, the cut metal web and the interleaf paper web are transported to a lamination position via a transport mechanism such as a conveyor, and then slid via a chute to be laminated at the lamination position. The electrification strength is determined manually by the operator based on observation by the operator or information on the adsorption force obtained from the sample.

[0004]

However, in the conventional suction method, if the charging voltage is weak when charging the interleaf web, the attraction force is insufficient and the interleaf is peeled off or shifted. In addition, if the charging voltage is strong, a brake is generated between the slip sheets that have already been stacked when stacking while slipping, so that stacking becomes impossible or irregularity occurs, resulting in defective products. There are drawbacks.

[0005] The relationship between the strength of charging and the strength of adsorption is based on the moving speed of the web, the width of the web, the water content of the interleaf paper web, the relative humidity around the web, and the photosensitive composition provided in layers on the metal web. It varies depending on the adsorption efficiency depending on the type of object, the adsorption efficiency depending on the type of interleaf paper web, and the adsorption efficiency based on the combination of the type of the photosensitive composition provided in layers on the metal web and the type of interleaf paper web. The intensity of the charged voltage is determined manually by the operator based on information of the adsorbing force obtained from the observation of the operator and the sample, and is manually adjusted.

However, it is difficult for an operator to make an accurate adjustment of the charged voltage, and furthermore, the period of the judgment is long, and the moving speed of the web and the water content of the interleaf web which change in a short time cannot be coped with. On the other hand, 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, there is a disadvantage that the operation is reduced by stopping the line to recover the trouble. Further, since the line is operated at a low speed until an appropriate charging condition is determined, there is a disadvantage that productivity is reduced.

The present invention solves this kind of problem. Even if the charging voltage is not strictly adjusted, the attraction force is insufficient and the slip sheet is not peeled off or displaced. It is an object of the present invention to provide a charging method in which a brake is not generated between interleaf sheets already stacked when the stacking is strong and the stacking becomes impossible and irregularities do not occur.

[0008]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a method for adsorbing a metal web and an interleaf paper web by electrostatically adsorbing the metal web and the interleaf paper web while charging them. In the above, when the adsorbed metal web and interleaf paper web are cut into a rectangular sheet, at least two opposing sides of the sheet are charged so as to be charged. It is characterized in that the paper web is charged.

In order to achieve the above object, the present invention provides a method of adsorbing a metal web and an interleaf paper web by charging the metal web and the interleaf paper web and electrostatically adsorbing the metal web and the interleaf paper web. When the paper web is cut into a rectangular sheet shape, the metal web and the interleaf paper web are charged so that the four corners of the sheet are charged.

[0010] Since the interleaf web is peeled off from the peripheral portion and does not come off from the center, the attraction force of the peripheral portion of the interleaf web is necessary for adsorbing the interleaf web which has become a sheet.
On the other hand, the braking force generated between the interleaf paper already accumulated is proportional to the charge amount. Therefore, when the web is cut into sheets, at least two opposing sides,
Or, by charging the web so that the four corners are charged, it has the attraction force of the sheet peripheral part necessary for processing, and further, by reducing the average charge amount per sheet, when accumulating while sliding Reduced braking force generated.

At this time, in anticipation of the fluctuation of the attraction force due to the fluctuation of the peripheral conditions of the interleaf web, the charging amount per unit area of the charged portion is set to be stronger than the charging amount per unit area when the entire web is charged. There is a need to. In this way, even if the charging adjustment is not strictly set, the adhering force is insufficient and the interleaf web is peeled off, or a braking force is generated between the interleaf paper already accumulated when sliding and accumulating. There is no possibility that the integration becomes impossible.

According to a second aspect of the present invention, a portion between two sides of the charged sheet is charged in a belt shape in parallel with the conveying direction. By charging a portion between the four corners in a belt shape parallel to the transport direction, it is possible to prevent the interleaf web from being lifted by the wind from the front during the transport. Thus, in the present invention, sheets can be stacked without any trouble.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of a method for adsorbing a metal web and an interleaf 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 device 1 to which the present invention is applied. This apparatus 1 forms a PS plate, and has a winding shaft 1 around which a metal web 10 is wound.
4, a rewinding device 24 having a winding shaft 22 around which the interleaf web 20 is wound, a nip roller 32 as an adhesion device for adhering the metal web 10 and the interleaf web 20, and a metal web. A charging device 34 for electrostatically adsorbing the paper web 20 and the interleaf paper web 20;
A cutting device 40 for cutting a web having the suction paper 0 and the interleaf paper web 20 into a predetermined length to form a rectangular sheet.
And three conveyors 7 for conveying the sheet to the stacking device 76
0, 70, and 70.

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 out the metal web 10. 18 are provided. The decurler 30 disposed close to the roller 18 includes a plurality of decurling rollers. On the other hand, the rewinding device 24 for the interleaf paper web 20 has a
A rotation drive source (not shown) is provided to rotate the sheet in the direction of the arrow to feed out the interleaf paper web 20, and a roller 26 is provided near the rewinding device 24.

A drying device 28 for the interleaf web 20 is provided between the rewinding 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 decurler 30, the nip roller 3
2 are arranged. On the downstream side of the nip roller 32,
A pair of feed rollers 36 is arranged, and the feed rollers 36 are rotated by a drive motor (not shown) to convey both webs 10 and 20. The slitter 38 disposed downstream of the feed roller 36 is provided on both webs 10 and 20.
Is provided with a pair of slitter blades for cutting into a predetermined width dimension. On the downstream side of the slitter 38, a charging device 3 for electrostatically adsorbing the metal web 10 and the interleaf web 20 which are in close contact with each other.
4 are 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 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.

As shown in FIG. 2, the charging device 34 comprises a high-voltage power supply 92, a charging electrode 90, and a high-voltage cable 94 for 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 on the insulator 98 in the width direction of the webs 10 and 20 at a pitch of 20 mm with the sharp ends 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 on the metal web 10. The charging device 34 turns on / off charging according to a charging command generated by the charging control device 42.

[0019]

【Example】

Description of peripheral charging FIG. 3 shows types of peripheral charging. Here, charged portions on the sheet 12 are shown in a mesh pattern, and the conveying direction of the sheet 12 is shown by arrows. The lateral peripheral charging sheet shown in FIG.
The sheet is charged in a web state such that the front peripheral portion and the rear peripheral portion are charged with a width of 200 mm at right angles to the traveling direction of the web when formed into a sheet.

The vertical peripheral charging A sheet shown in FIG.
The sheet is charged in a web state so that both lateral peripheral portions parallel to the traveling direction of the web when charged into a sheet are charged with a width of 200 mm. This vertical peripheral charging A may cause the interleaf web 20 to be lifted by the wind from the front during transportation, which may hinder the accumulation. Therefore, an improvement was made with a vertical peripheral charging B sheet shown in FIG. 3C in which the uncharged portion was charged at intervals in a belt shape in parallel with the transport direction.

The entire peripheral charging sheet shown in FIG. 3D has a front peripheral portion and a rear peripheral portion which are perpendicular to the traveling direction of the web when the sheet is formed, and both lateral peripheral portions parallel to the traveling direction. Are charged in the state of a web so that each is charged with a width of 200 mm, and the four corners are double-charged. In order to prevent the interleaf web 20 from rising, the central uncharged portion was charged in two elongated areas.

The four-corner charging sheet shown in FIG. 3 (E) is a sheet charged in a web state such that the four corners are charged at 200 mm × 200 mm when the sheet is formed. Since the four corner charging may cause the interleaf paper web 20 to be lifted by the wind from the front during transportation and hinder the accumulation, the middle part of the uncharged portion is charged at intervals in a belt shape parallel to the transport direction.

Description of Materials As the material, a PS for lithographic printing is used as the metal web 10.
Use plate. The PS plate is a thin aluminum plate (JIS alloy number 1050), width 1310, thickness 0.2 as a support.
mm and a length of 5000 m are used. The PS plate has a photosensitive composition provided on this support. 100% natural pulp and the same width as metal web 10 as interleaf paper web 20,
Thickness 0.05mm, length 10000m, basis weight 35g / m
m2 is used.

Processing Conditions As processing conditions, the interval between the slitter blades is set such that the diameter of the decurling roller constituting the decurling device 30 is 60 mm, and the width of the webs 10 and 20 after being cut by the slitting device 38 is 1300 mm. . The cutting length of the sheet 12 cut by the cutting device 40 is set to 1120 mm, and the conveying speed of the conveyor 70 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 0.5 m on the upstream side of the cutting device 40. The height from the webs 10 and 20 to the tip of the electrode needle 96 of the charging device 34 is set to 25 mm. The moisture content of the slip paper web 20 is 3% to 4.8%, and the humidity around the slip paper web 20 is 3%.
0% to 45%. The transport speed of webs 10 and 20 is 5
m / min to 70 m / min.

Processing Method In the 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, the slit is cut into a width of 1300 mm by a slitter device 38 and electrostatically adsorbed by a charging device 34. Length 11 by cutting device 40
The sheet 12 is formed by cutting the sheet 12 into 20 mm. Sheet 12
Is accelerated to 100 m / min by a conveyor device 70 and charged into a laminating device 76. The horizontal peripheral charging sheet shown in FIG. 3A captures a line speed signal (a pulse signal of one pulse per 1 mm of web movement) and a cut signal from the line controller 44 into the charging controller 42, and charges the sheet from the distance between the cutter and the electrode. Calculate the timing. A charging signal is sent to the charging device 34 to turn ON / OFF the charging. In the method for charging the peripherally charged B sheet shown in FIG. 3C, the electrode needles 96 are attached only where charging is required. When the width of the interleaf web 20 changes, the position of the electrode needle 96 is changed accordingly. During the web movement, the charging is turned on. 3D simultaneously performs horizontal peripheral charging in FIG. 3A and vertical peripheral charging B in FIG. 3B. In the four-corner charging in FIG. 3E, the same charging electrode 90 as the vertical peripheral charging B in FIG. 3C is used, and ON / OFF of charging is the same as the horizontal peripheral charging in FIG. 3A. .

Results FIG. 4 shows the results of an experiment comparing the conventional charging method of negative charging with the polarity change, alternating charging not included in the present claim, and the peripheral charging of the present embodiment. Note that the polarity change is usually a change in polarity, but with a positive polarity. The alternate charging is a charging method in which the negative charge and the positive charge are alternately performed to cancel the stored charge since the brake generated between the interleaf paper already accumulated is considered to be caused by the stored charge.

The alternate charging over the entire surface is such that when the web is cut into sheets, if the first sheet is negative, the second sheet is positive, the third sheet is negative, and so on. The half-surface alternate charging is such that if the first half of the first sheet is negative, the second half is positive, the first half of the second sheet is negative, the second half is negative, the first half of the third sheet is negative, and the second half is positive. The horizontal stripe charging is a switching between plus and minus at a pitch of 200 mm so as to form horizontal stripes. The vertical streak alternate charging is performed by adding positive and negative charges at a pitch of 200 mm so as to form vertical stripes.

As a result of the experiment, positive charging was effective in improving the suitability for integration, but was not a solution because it was unstable and sometimes caused trouble. Alternating charging did not improve the suitability for integration. The peripheral charging of the present example was effective in improving the suitability for integration. In particular, the four corner charging was very effective.

[0030]

According to the method for adsorbing a metal web and an interleaf web according to the present invention, when the web is cut into a sheet, the web is charged so that only the peripheral portion is charged. With the setting of, there is no suction force shortage, the slip sheet does not peel off or slip, and the accumulation becomes impossible or irregular due to the occurrence of a brake due to the excessive charged voltage when stacking. There is no. As a result, trouble in the line was reduced, product yield was improved, and waste was reduced. In addition, the operating rate improved due to reduced trouble. Further, since the charging condition is quickly determined, the low-speed operation time is shortened, and the productivity is improved.

[Brief description of the drawings]

FIG. 1 is an overall structural diagram showing an embodiment of a web cutting device.

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

FIG. 3 is an explanatory diagram showing types of peripheral charging of a web.

FIG. 4 is a diagram showing experimental results comparing a negative charging, which is a conventional charging method, a polarity change and an alternating charging, which are not included in the present claims, with peripheral charging of the present embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Metal web 12 ... Sheet 20 ... Interleaf web 28 ... Drying device 34 ... Charging device 42 ... Charging control device

Claims (4)

[Claims] 1. A method of adsorbing a metal web and an interleaf paper web, wherein the metal web and the interleaf paper web are electrostatically adsorbed by being charged while being transported, wherein the adsorbed metal web and the interleaf paper web are rectangular. A metal web and an interleaf paper, wherein the metal web and the interleaf paper are charged so that at least two opposing sides of the sheet are charged when the sheet is cut into a sheet shape. Adsorption method with web. 2. The two sides of the sheet to be charged are both lateral sides parallel to the transport direction of the metal web and the interleaf web, and a part between the two sides is parallel to the transport direction. 2. The method for adsorbing a metal web and an interleaf paper web according to claim 1, wherein the metal web and the interleaf paper web are charged in a belt shape. 3. A method of adsorbing a metal web and an interleaf paper web by charging and electrostatically adsorbing the metal web and the interleaf paper web, wherein the adsorbed metal web and the interleaf paper web are formed into a rectangular sheet shape. A method of adsorbing a metal web and an interleaf paper web, wherein the metal web and the interleaf paper web are charged so that the four corners of the sheet are charged when cut. 4. The method for adsorbing a metal web and an interleaf paper web according to claim 3, wherein a part of the charged sheet between four corners is charged in a belt shape in parallel with the conveying direction.