JP3755213B2 - Method and apparatus for adsorbing metal web and interleaf web - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an adsorption method and apparatus for a metal web and a slip sheet web, and more particularly to an adsorption method and apparatus for electrostatically adsorbing a metal web such as a photosensitive lithographic printing plate and a slip sheet web.
[0002]
[Prior art]
A photosensitive lithographic printing plate PS plate (abbreviation of Pre-Sensitized Plate) is used in which a photosensitive composition is applied in layers on a metal support such as an aluminum plate. When a large number of PS plates are stored in a cardboard box and shipped, an interleaf paper web is electrostatically adsorbed on the surface to protect the photosensitive composition.
[0003]
A web cutting apparatus for producing such a PS plate is disclosed in Japanese Patent Application Laid-Open No. 61-241096. A metal web roll in which a metal web (PS plate) is wound in a coil shape, and an interleaf paper web are wound. And a rotated interleaf web roll.
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 paper roll is charged by the charging device, An interleaf paper web is supplied to each other and electrostatically attracted to each other. The adsorbed metal web and interleaf paper web are sandwiched and adhered by a pair of nip rollers, and then cut into a sheet having a predetermined length by a cutter. And the cut | disconnected metal web and interleaf paper web are laminated | stacked on the lamination position via a chute | shooting, after conveying to a lamination position via conveyance mechanisms, such as a conveyor.
[0004]
Conventionally, a laminate of polyethylene is used as the interleaving web, but recently, a pulp-made one is used from the viewpoint of recycling.
[0005]
[Problems to be solved by the invention]
However, if a product made of pulp is used as a slip sheet web, a sufficient adsorbing force cannot be obtained even if it is charged by a charging device, and therefore the slip sheet web is peeled off from the metal web when cut with a cutter. There is a drawback.
The cause of this is the moisture content of the slip sheet web. For example, the outer peripheral portion of the slip sheet web roll absorbs moisture in the transportation place and the storage place and the moisture content rises, so that the normal charge voltage (-6 kV to- 11 kV), the metal web and the interleaf paper web do not adsorb. Incidentally, the charging voltage - If set to 11kV than, because sparks are generated, it is impossible to raise the charging voltage.
[0006]
For this reason, in the conventional charging voltage setting, after the line is operated, it is confirmed that the interleaf paper web is not peeled off from the metal web on the conveyor on the downstream side of the cutter. Adjustments are made based on the experience of the operator until it can be stacked without stopping on the way. During this time, the line is operated at a low speed, which causes a decrease in productivity. In addition, if the charging conditions are inappropriate, the stacking apparatus may cause a failure, resulting in a decrease in product yield and a reduction in productivity because the line must be stopped to recover from the failure.
[0007]
On the other hand, the pulp interleaf web roll has different moisture content at the outer peripheral portion and inner peripheral portion of the roll (the moisture content decreases toward the inner peripheral portion). Has to be confirmed in the laminated part, and has the disadvantage of poor workability.
This invention is made in view of such a situation, and provides the adsorption | suction method and apparatus of a metal web and a slip sheet web which can adsorb | suck a metal web and a slip sheet web stably. Objective.
[0008]
[Means for Solving the Problems]
The present invention, in order to achieve the object, the pulp made interleaf paper web was dried to set the water content of the pulp made interleaf paper web in the range of 3.0 to 4.8%, manufactured pulp of the water content The interleaf paper web and the metal web are charged and electrostatically adsorbed , the electrostatically adsorbed pulp interleaf paper web and the metal web are cut into sheets of a predetermined length, and the cut sheet is passed through a chute. It is characterized by being laminated on the table by sliding .
It was confirmed by experiments that the cause of the peeling of the pulp-made interleaf paper web when the charging voltage was constant occurred when the moisture content exceeded 4.8%. In addition, it was confirmed by experiments that when the water content was less than 3.0, the metal web was adsorbed on the chute during lamination due to excessive charge amount, resulting in poor lamination.
[0009]
Thus, according to the present invention, after the interleaf paper web is dried and the moisture content of the interleaf paper web is set in the range of 3.0 to 4.8%, the interleaf paper web and the metal web are charged and statically fixed. Since the electroadsorption is performed, the metal web and the interleaf paper web can be adsorbed stably.
The present invention comprises a slip sheet web drying means, the moisture content of the slip sheet web dried by the drying means is measured by the moisture content measuring means, and the moisture content of the slip sheet web measured by the moisture content measuring means is measured. The drying means is controlled by the control means so that the rate is in the range of 3.0 to 4.8%. Thereby, this invention can control the moisture content of a slip sheet web uniformly.
[0010]
The drying means comprises a temperature setter for setting the temperature of the heater and a motor for changing the rotational speed of the fan, and the control means controls the temperature setter to reduce the moisture content of the interleaf paper web. Control. Thereby, this invention can control a moisture content easily rather than controlling the rotation speed of a fan and controlling a moisture content.
By the way, the pulp interleaf paper web is difficult to be charged by itself, so it is necessary to be charged simultaneously with the metal web. Therefore, according to the present invention, a contact means is provided in front of the charging means, and the metal web and the slip sheet web are brought into close contact by the contact means, and then the metal web and the slip sheet web are charged simultaneously by the charge means. Yes. Therefore, this invention can adsorb | suck a metal web and a slip sheet web more stably.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of a method for adsorbing a metal web and a slip sheet web and an apparatus therefor according to the present invention will be described in detail below with reference to the accompanying drawings.
FIG. 1 is an overall structural view of a web cutting apparatus for producing a PS plate. The web cutting apparatus shown in FIG. 1 includes a rewinding device 14 having a winding shaft 12 around which an aluminum plate (metal web) 10 is wound, and a winding shaft 18 around which a pulp interleaf web (interleaf paper web) 16 is wound. A rewinding device 20 having pulp, a drying device (drying means) 22 for the pulp interleaf web 16, a pair of nip rollers (contacting means) 24 for bringing the aluminum plate 10 and the pulp interleaf web 16 into close contact, and the aluminum plate 10 and the pulp. A charging device (charging means) 26 for electrostatically adsorbing the interleaf paper web 16, a slitter 28 for cutting the web adsorbed by the aluminum plate 10 and the pulp interleaf web 16 to a predetermined width, and a web cut by the slitter 28 Is provided with three cutters 36, 36, 36 for conveying the sheet 30 to the laminating apparatus 34.
[0012]
The rewinding device 14 for the aluminum plate 10 includes a rotation drive source (not shown) for feeding the aluminum plate 10 by rotating the winding shaft 12 in the direction of the arrow. The aluminum plate 10 rewound by the rewinding device 14 is conveyed along a plurality of pass rollers 38, 38, and guided to the decurling device 40, and the curl of the aluminum plate 10 is corrected by the decurling device 40. . The plurality of decurling rollers 42, 42... Of the decurling device 40 are formed to have a smaller diameter (30 mm to 80 mm) than the pass roller 38.
[0013]
On the other hand, the unwinding device 20 for the interleaf paper web 16 rotates the winding shaft 18 in the direction of the arrow in the drawing in the same manner as the unwinding device 14 for the aluminum plate 10 to send out the interleaf paper web 16 (not shown). It has. The interleaf paper 16 rewound by the rewinding device 20 is conveyed along a plurality of pass rollers 44, 44... And guided to the drying device 22 so that the drying device 22 has a predetermined moisture content range. To be dried.
[0014]
As shown in FIG. 2, the drying device 22 includes a heater 46, a fan 48, a nozzle 50, and a casing 52 that covers the nozzle 50. In addition, two heaters 46, fans 48, and nozzles 50 are provided, and the pair of nozzles 50, 50 are installed so that the hot air injection ports 51, 51. The slip sheet web 16 is conveyed from an inlet opening 54 formed on the upper surface of the casing 52 to a gap 56 between the nozzle 50 and the nozzle 50, and is folded upward by a pass roller 58 disposed below the gap 56. After that, it is conveyed again to the gap 56. The interleaf web 16 is dried so as to have a predetermined moisture content during this period. Then, after the interleaf web 16 is unloaded from the outlet opening 60 of the casing 52, it is conveyed toward the nip roller 24 via a plurality of pass rollers 62, 62... Shown in FIG.
[0015]
Moisture content measuring devices (moisture content measuring means) 64 and 66 are arranged on the upstream side and the downstream side of the drying device 22. These moisture measuring devices 64 and 66 (infrared moisture meter developed by Nippon Tobacco Inc., trade name “JE-100”) measure the moisture value at the substantially central portion of the interleaf paper web 16, and the moisture content thereof. Data indicating the value is output to the CPU 68 shown in FIG. The CPU 68 calculates the moisture content of the slip sheet web 16 based on the data. Further, the CPU 68 controls the heater temperature setting unit 47 of the drying device 22 so that the moisture content of the interleaf paper web 16 is in the range of 3.0 to 4.8% based on the calculated moisture content. Reference numeral 49 denotes a fan motor.
[0016]
In FIG. 1, a pair of nip rollers 24 and 24 are disposed on the downstream side of the decurling device 40. In FIG. 4, the aluminum plate 10 is conveyed toward the nip roller 24 with the photosensitive composition coating surface facing upward. When the aluminum plate 10 passes through the nip rollers 24, 24, the interleaf web 16 wound around the upper nip roller 24 is placed on the application surface and sandwiched between the nip rollers 24, 24. As a result, the interleaf paper web 16 is brought into close contact with the coated surface of the aluminum plate 10.
[0017]
A charging device 26 is installed on the downstream side of the nip rollers 24 and 24. The charging device 26 includes a discharge needle 70 for charging the aluminum plate 10 and the interleaf web 16. A large number of discharge needles 70 are provided at predetermined intervals in the width direction between the aluminum plate 10 and the interleaf paper web 16. When a voltage is applied to the discharge needles 70, 70 ... from a high voltage device (not shown),-ions are released from the discharge needles 70, 70 ..., and the aluminum plate 10 and the interleaf paper web 16 are negatively charged. It is electrostatically attracted.
[0018]
As shown in FIG. 1, a pair of feed rollers 72 and 72 are installed on the downstream side of the charging device 26. The electrostatically adsorbed aluminum plate 10 and the interleaf paper web 16 are conveyed to the slitter 28 by the rotational driving force of the feed rollers 72 and 72, and are cut into a predetermined width by the blades 74 and 74 of the slitter 28. The sheet is cut into a sheet 30 having a predetermined length by the cutter 32. The sheet 30 is conveyed to the laminating apparatus 34 by three conveyors 36, 36, 36. Further, the sheet 31 determined to have a quality problem in the middle process is discharged to the disposal box 78 by the sorting device 76.
[0019]
The stacking device 34 stacks the non-defective sheets 30 sequentially fed from the transport conveyor 36 at the subsequent stage on the table 80 with the side surfaces of the sheets 30 aligned by a side stopper (not shown). The stacking device 34 includes a chute 82 that slides and stacks the sheet 30 on the table 80, a shock absorber 84 that is disposed in the loading direction of the sheet 30 and absorbs the impact of the sheet 30, and air directed toward the loading direction. A sheet rear end stopper 86 having means for ejecting is provided.
[0020]
By the way, the moisture content of the pulp interleaf paper web 16 and the peeling occurrence rate of the interleaf paper web 16 have the relationship shown in FIG. The vertical axis in FIG. 5 indicates the separation occurrence rate of the interleaf paper web 16, and the horizontal axis indicates the moisture content. As shown in the figure, when the moisture content is up to 4.8%, the occurrence rate is 0%, but when it exceeds 4.8%, it tends to increase rapidly. Therefore, the moisture content of the interleaf web 16 needs to be kept within 4.8%.
[0021]
Further, the moisture content of the interleaf web 16 and the sheet stacking failure occurrence rate (occurrence rate of the sheet 30 adsorbing to the chute 82) are in the relationship shown in FIG. The vertical axis in FIG. 6 indicates the stacking fault occurrence rate, and the horizontal axis indicates the moisture content. As shown in the figure, when the water content is less than 3.0%, the sheet 30 is adsorbed to the chute 82 during lamination due to excessive charge amount, resulting in poor lamination. If the water content is 3.0% or more, the generation rate is 0%. Therefore, it is necessary to set the moisture content of the interleaf paper web 16 to 3.0% or more.
[0022]
Therefore, in order to laminate the sheets 30 stably, it is necessary to set the moisture content of the interleaf paper web 16 in the range of 3.0 to 4.8%. Control of this moisture content is shown in FIG. The drying device 22, the water content measuring devices 64 and 66, and the CPU 68 perform the processing.
That is, the CPU 68 calculates the moisture content based on the moisture values output from the two moisture content measuring devices 64 and 66, and the CPU 68 determines that the moisture content is in the range of 3.0 to 4.8%. Thus, the heater temperature setting unit 47 of the drying device 22 is controlled.
[0023]
FIG. 7 shows a first embodiment of the control method of the CPU 68. In FIG. 7, the vertical axis represents the moisture content of the slip sheet web 16, and the horizontal axis represents the feed length of the slip sheet web 16. As shown in the figure, at the beginning of feeding, the outer peripheral portion of the roll is fed out, so the moisture content is high. In this case, the delivery is temporarily stopped and the drying device 22 is operated, and the delivery is resumed when the water content becomes 4.8% or less (approximately 4.4% in FIG. 7). At this time, since the drying device 22 is continuously operated, the water content gradually decreases as shown by a solid line. Further, even if the drying device 22 is stopped immediately after operation, there is no problem because the moisture content of the interleaf paper web 16 decreases as indicated by the dotted line in the drawing as the feed length increases.
[0024]
FIG. 8 shows a second embodiment of the control method of the CPU 68. The vertical axis in FIG. 8 is the moisture content of the interleaf paper web 16, and the horizontal axis is the feed length of the interleaf paper web 16. The second embodiment does not operate the drying device 22 continuously, but is a control method in which the drying device 22 is operated until the moisture content of the interleaf paper web 16 falls within the specified range, and the operation is stopped thereafter. is there.
[0025]
Thus, in the present embodiment, the aluminum plate 10 and the pulp interleaf paper web 16 can be stably adsorbed and laminated.
Further, in the present embodiment, as shown in FIG. 3, the CPU 68 controls the water content by controlling the heater temperature setter 47, so the water content is controlled by controlling the rotational speed of the fan motor 49. The water content can be controlled more easily than this.
[0026]
Furthermore, in the present embodiment, as shown in FIG. 1, nip rollers 24 and 24 are provided in the front stage of the charging device 22 so that the aluminum plate 10 and the interleaf paper web 16 are brought into close contact with each other, and then charged simultaneously by the charging device 22. I am letting. That is, since the pulp interleaf paper web 16 that is difficult to be charged alone is charged together with the aluminum plate 10, the aluminum plate 10 and the interleaf paper web 16 can be adsorbed more stably.
[0027]
【Example】
Using a web of aluminum thin plate (JIS alloy 1050) having a thickness of 0.2 mm and a width of 1310 mm as a metal support, 100% natural pulp as a slip sheet, a thickness of 0.05 mm, a basis weight of 35 g / mm ² , a width A 1310 mm slip-sheet web is used. As other conditions, the speed of the rewinding device is 20 m / min, the diameter of the decurling roller constituting the decurling device is 60 mm, the width of the web cut by the slitter is 1300 mm, and the cutting length of the sheet cut by the running cutter is 1120 mm, the conveyor transport speed is set to 110 m / min.
[0028]
Further, the diameter of the nip roller on the downstream side of the decurling device was 250 mm, stainless steel having a diameter of 3 mm and a length of 15 mm was used as the discharge needle of the charging device, and 72 pieces were arranged in the web width direction at a pitch of 20 mm. The height from the web to the ground of the charging device is preferably set between 20 and 100 mm. In this embodiment, the height is set to 35 mm and the charging voltage is set to -8 kv.
[0029]
The hot air for drying the interleaving web is 5 m / sec and the temperature is 200 ° C. Further, the width of the nozzle injection port was 8 mm, the length was 700 mm, and the gap between the nozzle and the interleaf paper web was set to 50 mm.
The aluminum plate and the interleaf paper web are brought into close contact by a nip roller and then electrostatically adsorbed by a charging device. Next, after being cut into a width 1300 by a slitter, the sheet is cut into a sheet having a length of 1120 mm by a running cutter. The sheet is accelerated to 110 m / min by a conveyor and stacked on a stacking apparatus.
[0030]
At this time, the temperature in the work place was set to 24 ° C. and the humidity was set to 40%.
When the line speed was operated at 20 m / min, when the interleaf paper web having a water content of 4.8% was electrostatically adsorbed to the aluminum plate, what was not adsorbed so far was adsorbed reliably.
Further, immediately after the start of rewinding another interleaf paper web under the same conditions as described above, the water content of the interleaf paper web was 5.0%. Reduced to 2%, and the problem that the interleaf paper web peeled off on the conveyor was resolved. As a result, in the conventional method, when the line paper web is peeled off at the start of the line operation, no product defects of 10 m to 500 m are generated at all.
[0031]
Also, if the drying device is operated only where the moisture content of the outer periphery of the interleaf paper web is high, the moisture content of the interleaf paper web is kept within a certain range, and operation with the charging voltage kept constant is possible. It becomes.
[0032]
【The invention's effect】
As described above, according to the method and apparatus for adsorbing a metal web and a slip sheet web of the present invention, the moisture content of the slip sheet web is in the range of 3.0 to 4.8% by drying the slip sheet web. Then, the interleaf paper web and the metal web are charged and electrostatically adsorbed, so that the metal web and the interleaf paper web can be stably adsorbed and laminated.
[Brief description of the drawings]
FIG. 1 is an overall structural view showing an embodiment of a web cutting device. FIG. 2 is an explanatory view showing the structure of a drying device. FIG. 3 is a block diagram showing a control system of the drying device. [Fig. 5] Fig. 5 is a diagram showing the rate of occurrence of peeling of the interleaf paper web with respect to the moisture content. [Fig. 6] is a diagram showing the occurrence rate of stacking failure with respect to the moisture content. FIG. 8 is a diagram showing a second embodiment of the moisture content control method by the CPU.
DESCRIPTION OF SYMBOLS 10 ... Aluminum plate 16 ... Pulp paper web 22 ... Drying device 24 ... Nip roller 26 ... Charging device 34 ... Laminating device 36 ... Conveyor 64, 66 ... Moisture content measuring device 68 ... CPU

Claims (4)

The pulp made interleaf paper web was dried to set the water content of the pulp made interleaf paper web in the range of 3.0 to 4.8%,
The moisture content pulp interleaf paper web and the metal web are charged and electrostatically adsorbed ,
Cutting the electrostatically adsorbed pulp interleaf web and metal web into sheets of a predetermined length;
A method for adsorbing a metal web and an interleaf paper web, wherein the cut sheets are slid and stacked on a table via a chute . Means for drying pulp interleaf web;
A moisture content measuring means for measuring the moisture content of the pulp interleaf paper web dried by the drying means;
Control means for controlling the drying means such that the moisture content of the pulp interleaf web measured by the moisture content measuring means is in the range of 3.0 to 4.8%;
A charging means for charging and electrostatically adsorbing the pulp interleaf paper web having a water content set in a range of 3.0 to 4.8%, and a metal web;
A cutter for cutting a pulp interleaf web and a metal web electrostatically adsorbed by the charging means into a sheet having a predetermined length;
A chute for sliding and laminating sheets cut by the cutter on the table;
An apparatus for adsorbing a metal web and an interleaf paper web characterized by comprising: The drying means is composed of a temperature setter for setting the temperature of the heater and a motor for changing the rotational speed of the fan, and the control means controls the moisture content of the slip sheet web by controlling the temperature setter. The apparatus for adsorbing a metal web and a slip-sheet web according to claim 2 . Claim 2, characterized in that the contact means for bringing into close contact with the interleaving paper web and the metal web, is provided in front of said charging means and so as to simultaneously charge the metal web and the interleaf sheet web by the charging means An adsorption apparatus for the metal web and the slip-sheet web as described.

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