JP2003040495A - Winding core, and method for winding planographic printing plate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a winding core capable of suppressing winding deviation of a web, and enabling to use repeatedly with high durability. SOLUTION: A Linatex rubber sheet 110 is attached on an outer circumferential surface of a paper tube 60 as a winding core, and a PVC tape 112 for preventing leakage of an adhesive is attached to a joint J. The Linatex rubber sheet 110 has high frictional force, and is closely contact with the web by adhesive force equivalent to the adhesive. Therefore free movement of a tip end of the web is suppressed and movement for forming a clearance is restrained so that the winding deviation is securely prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a winding core for winding a lithographic printing plate which runs on aluminum as a support, and a winding method thereof.

[0002]

2. Description of the Related Art As shown in FIG. 14, a lithographic printing plate production line comprises a surface treatment step 42, a coating step 44, and a drying step 46. An aluminum web, which is an aluminum support, is From the state wound on the coil, it is conveyed to the surface treatment step 42 by the sending-out apparatus 48, and thereafter, the planographic printing plate W (hereinafter referred to as “web W”) is passed through the coating step 44 and the drying step 46, and the winding apparatus 50.
To be wound up.

Generally, the web W in the winding device 50 is
The winding is performed using a belt wrapper. When the tip end of the web W is sandwiched between the rubber belt of the belt wrapper and the paper core as a winding core and is wound, the take-up speed of the paper core is made faster than the line speed of the web W, so that the tip of the web W is Is wound around the paper tube, but the front end of the web W is not adhered to the paper tube. Therefore, when the web W is pulled with a large force, the front end portion of the web W runs idle along the outer peripheral surface of the paper tube 60. Sometimes.

When the coil diameter of the web W is increased, as shown in FIG. 15, the mat M near the paper tube 60 (a hemispherical shape provided on the surface of the photosensitive layer D and having a diameter of 10 to 50 μm) is used.
m, which is a small protrusion having a height of 5 to 10 μm and which accelerates vacuuming, is slightly crushed to increase a gap between the adjacent webs W that are orbited. In this case, since the frictional resistance of the surface of the web W is reduced, the web W is wound tightly,
Alternatively, the tip of the web W moves in the circumferential direction of the outer surface of the paper tube to fill the gap.

On the other hand, since the web W has a slight elastic deformation and the paper tube 60 has a large contraction expansion deformation, a part of the gap is filled with the relative deformation of the web W and the paper tube 60.

However, since the winding tightening phenomenon stops when the winding tightening stress and the frictional resistance of the surface of the web W are balanced, the internal stress on the core side of the web W changes in a complicated manner while the winding is continued. It is in an unstable state. Therefore, the web wound near the leading end of the web and the paper core is easy to move, which causes misalignment.

As shown in FIG. 16, this winding deviation is measured by marking a choke mark S in the radial direction of the paper tube 60, and the lateral deviation amount L from the center of the paper tube and the horizontal deviation in the radial direction. It is represented by three shift amounts, a shift amount H and a vertical shift amount X in the axial direction of the paper tube 60 shown in FIG.

As described above, the wound coil-shaped web may not be unwound due to a large winding deviation when unwound on the processing line, and the mat in the unwound portion may be peeled off or scraped. It may be crushed.

As a method of preventing the winding deviation, there are a method of previously attaching a double-sided adhesive tape to the paper tube, and a method of attaching the front end to the paper tube with the single-sided adhesive tape when winding the web W. However, with this method, it must be done manually by the operator, which is troublesome. Further, since the paper tube is repeatedly used, there is also a problem that the dirt such as the adhesive has to be removed.

There is also a method of using a synthetic resin such as neoprene rubber as the core, but it is not possible to obtain a high frictional force for stopping the movement of the tip of the web W, and the durability is not sufficient.

[0011]

SUMMARY OF THE INVENTION In consideration of the above facts, the present invention can suppress the winding deviation of the web, and
An object is to provide a winding core that can be repeatedly used and has high durability.

[0012]

According to a first aspect of the present invention, in a winding core for winding a traveling lithographic printing plate, a low temperature vulcanized natural rubber sheet is attached to an outer peripheral surface of the winding core. It has a feature.

According to the first aspect of the invention, the low temperature vulcanized natural rubber sheet attached to the outer peripheral surface of the winding core has a high frictional force, and has an adhesive force equivalent to that of the planographic printing plate and the adhesive. Since they are in close contact with each other, the free movement of the front end of the lithographic printing plate is suppressed and the operation for forming the gap is stopped, so that the winding deviation can be reliably prevented.

According to a second aspect of the present invention, the winding core is a paper tube, and the outer peripheral surface of the paper tube has a thickness of 1.2 mm to 1.
It is characterized in that a low-temperature vulcanized natural rubber sheet of 8 mm is wound and adhered with an adhesive, and a blinding tape is attached to the joint of the low-temperature vulcanized natural rubber sheet.

According to the second aspect of the present invention, the low temperature vulcanized natural rubber sheet has a thickness of 1.2 mm to 1.8 mm to ensure an appropriate elastic force, and the low temperature vulcanized natural rubber at the tip of the lithographic printing plate. Guarantees the bite into the rubber sheet. Thereby, the movement of the front end of the planographic printing plate can be surely suppressed.

By sealing the seam of the low temperature vulcanized natural rubber sheet with a blinding tape, the adhesive can be prevented from flowing out from the seam and the planographic printing plate is not contaminated.

According to a third aspect of the present invention, the low temperature vulcanized heaven is used.
Natural rubber sheet is 280 fg / cm ²More tensile strength
Degree, elongation at break of 800% or more, permanent set of 10% or less
JISA hardness of 38 ± 2 °, tolerance of -40 to 70 ° C
Abrasion test after 1000 wear wheels in temperature and Akron wear test
Product is 0.10 cm³It is characterized by the above.

In the invention according to claim 3, as a low temperature vulcanized natural rubber sheet having the above-mentioned characteristics, Linatex (trade name of niche) can be mentioned.

According to a fourth aspect of the present invention, in a method of winding a lithographic printing plate in which a running lithographic printing plate is wound around a winding core, a low temperature for preventing winding deviation of the lithographic printing plate on an outer peripheral surface of the winding core is provided. The feature is that a vulcanized natural rubber sheet is attached.

[0020]

BEST MODE FOR CARRYING OUT THE INVENTION A method of winding a lithographic printing plate according to this embodiment will be described below with reference to FIGS.

The winding device 10 used in the winding method.
Includes a winding roll 12 into which a paper tube 60 as a winding core is inserted and fixed. The winding roll 12 has a core 6
4 and an arcuate cell 62 divided along the axial direction. A hydraulic cylinder (not shown) is arranged between the cell 62 and the core portion 64, and the cell 62 is supported by the rod of the hydraulic cylinder and is movable in the radial direction. That is, by expanding and contracting the rod of the hydraulic cylinder, the outer diameter of the circle drawn by the outer surfaces of the plurality of cells 62 can be expanded or contracted.

With such a structure, the cell 62 having a reduced diameter is inserted into the paper tube 60, and the cell 62 is expanded to fix the paper tube 60 so as not to be displaced. The shaft end 64A of the core 64 is rotatably supported by a frame (not shown). A pulley 66 is fixed to the shaft end 64A.
A belt 68 is wound around the pulley 66 and a drive pulley 70 driven by the electric winding motor 32. As a result, the driving force is transmitted to the pulley 66 via the belt 68, the paper tube 60 rotates together with the core portion 64, and the web W is wound up.

Rotation torque of the winding motor 32 is controlled by an electric signal V2 output via a current regulator 36 and a thyristor 38. The electric signal V2 is output from the tension reference generation circuit 40 so as to be able to respond to the tension that continuously changes based on the winding tension pattern.

An encoder 56 is attached to the take-up roll 12, detects the number of revolutions of the take-up roll 12, and outputs it to the microcomputer 58. The number of windings and the winding diameter of the web W are calculated from the number of rotations of the winding roll 12 and the plate thickness of the web W.

Further, bridle rollers A and B are arranged on the upstream side of the winding device 10, and electric motors M1 and M1, respectively.
It is driven with a predetermined torque by M2.

The torque of the bridle rollers A and B is
The speed reference signal indicating the traveling speed of the web W and the detection signal indicating the rotation speed of the electric motors M1 and M2 detected by the rotary encoders 14 and 16 are supplied to the electric motors M1 and M2 via the speed adjusters 18 and 20 and the thyristors 22 and 24. Controlled by being sent to.

The bridle rollers A and B bear the tension of the web W and cut the web W to give a tension difference before and after the traveling direction, so that the tension determined for each process is applied to the web W.
To give to.

On the other hand, a dancer roller 26 is arranged on the bridle roller B side. The dancer roller 26 adjusts the tension applied to the web W and moves up and down by an air cylinder 28 driven by the pressure of compressed air.

A pneumatic converter 30 is connected to the air cylinder 28. The static converter 30 is the microcomputer 5
The electric signal output from 8 is converted into compressed air having a pressure corresponding to the electric signal and supplied to the air cylinder 28. As a result, the dancer roller 26 moves up and down, and the take-up roll 1
The tension of the web W wound around 2 is continuously changed.

A tensiometer 34 is arranged between the bridle roller A and the winding roll 12. The tension of the web W is measured by the tensiometer 34, and the microcomputer 5
Feedback control is performed at 8.

On the other hand, a belt wrapper 72 is arranged laterally of the winding device 10, and a rubber belt 74 is positioned so as to receive the paper tube 60.

As shown in FIG. 7, the rubber belt 74 is wound around a plurality of support rolls 76 to form a loop. Further, the support roll 78 is brought into contact with and separated from the paper tube 60 by the cylinder 80, and the winding tension of the rubber belt 74 is changed according to the winding diameter.

Further, as shown in FIG. 9, on the inlet side of the web W, a support roll 84 pivotally supported by the tip of the turning arm 82 is positioned. That is, the revolving arm 82 is rotatably supported by the shaft 110, and by pushing and pulling the rear end of the revolving arm 82 by the cylinder 102, the revolving arm 82 revolves and the supporting roll 84 holds the rubber belt 74. The web W is pressed against the inlet side, and as shown in FIG. 10, the leading end of the circulated web W is guided again to the outer peripheral surface of the paper tube 60.

Further, the swivel arm 82 has a guide plate 8
6 is attached, and the guide plate 86 guides the leading end of the web W between the paper tube 60 and the rubber belt 74 to wind the web W around the paper tube 60.

Further, the housing 8 of the belt wrapper 72
A traveling wheel 90 is provided at a lower portion of the belt 8, and as shown in FIG. 12, the belt wrapper 72 is pushed and pulled by the cylinder 92 to come into contact with and separate from the winding device 10.

Further, the belt wrapper 72 has a paper tube 6
A supply arm 94 that holds 0 and rotates is arranged. The supply arm 94 is swingably supported by a shaft 96, and by pushing and pulling a rear end of the supply arm 94 by a cylinder 98, as shown in FIGS.
While being wound, it is sent toward the winding device 10.
Further, the cylinder 104 is provided at the tip of the supply arm 94.
An arcuate finger 100 that opens and closes with is provided, and the take-up roll 12 is inserted into the paper tube 60 held by the finger 100, and as shown in FIG. The web W is wound together with the roll 12 to wind the web W as shown in FIGS. Then, the web W that has been wound and formed into a roll is restrained by the holding belt 150 shown in FIG.

On the other hand, as shown in FIG. 4 to FIG.
Is made of K liner paper with a thickness of 0.3 mm to 0.4 mm, and has an outer diameter of 336 mm ± 1 mm and an inner diameter of 300 mm.
± 1 mm, surface length (axial length) is 1400 mm ± 2 m
m, and the thickness is 18 mm ± 1 mm.

A low-temperature vulcanized natural rubber sheet having a thickness of 1.2 mm to 1.8 mm and a liner-tex rubber sheet 110 having no irregularities or wrinkles is wound around the paper tube 60 and attached with an adhesive. . Since the liner-tex rubber sheet 110 cannot be laminated on the paper tube 60, a seam J is generated.

Therefore, the adhesive tape is sealed with the vinyl tape 112 so that the adhesive does not leak from the joint J.
This prevents the web W from being soiled by the adhesive.

Also, the Linatex rubber sheet 110
Is tensile strength of 280 fg / cm ² or more, elongation at break of 800% or more, permanent set of 10% or less, 38 ± 2 °
JIS A hardness, allowable temperature of -40 to 70 ℃, Akron wear test, the wear volume of wear wheel 1000 times 0.10c
It has characteristics of m ³ or more and a specific gravity of 0.97. In the present invention, although the Linatex rubber sheet is used, if the material satisfies the above performance and accuracy,
There is no problem using rubber sheets manufactured by other manufacturers.

As described above, the following effects can be exhibited by attaching the lineatex rubber sheet to the paper tube.

Usually, the web W is wound on the paper tube until the maximum diameter of φ1600 mm or the weight of 5000 kg is reached. When the winding deviation phenomenon of the web W is observed, it varies depending on the type, but when the diameter exceeds a certain value, the web W is greatly wound. It is known that the gap will start.

This winding misalignment is, as shown in FIG. 13A, a choke mark S printed in the radial direction of the paper tube 60.
However, as shown in FIG. 13 (B), by drawing an arcuate shape toward the outside so as to swirl, the front end of the web W becomes
It can be seen that it is moving along the outer peripheral surface of 0. this is,
This is because the increase in the gap described in the section of the related art allows the web W to move freely.

However, in the core of this embodiment, the movement of the front end of the web W is caused by the effect of the front end of the web W biting into the liner-tex rubber sheet 110 attached to the paper tube 60 and the large frictional resistance with the web W. Is stopped and winding misalignment is prevented. Also, Linatex rubber sheet 1
The elastic force of 10 absorbs the gap with the web W.

After the web W wound around the paper tube 60 in this manner is unwound on the processing line, the web W is left on the paper tube 60 for several meters in order to guarantee the quality of the web W. . The unwound web W is removed by the operator, and the paper tube 60 is reused as a winding core in the production line, but the liner-tex rubber sheet 110 is free from stains such as adhesive. So you can use it as it is. (Example) Using a paper tube 60 to which a liner-tex rubber sheet 110 is attached as a measure against winding deviation, a thickness of 0.
Web W with 1 mm to 0.5 mm and maximum width of 1500 mm
A tension pattern in which the winding start tension is selected from 400 to 800 kg according to the thickness and width size of the web W, and the winding end tension of the maximum diameter is equal to or higher than the unwinding tension of the unwinding machine to the processing line. Web W was wound up.

At the beginning of winding, use a belt wrapper,
When winding around the paper core, the winding speed of the paper core is 10-30
The web W was wound up to a winding diameter of φ1600 mm at a winding speed of 120 m / min at maximum, after the leading end portion of the web W was wound around 2 to 3 rounds at m / min.

When the web W is strongly adhered to the liner-tex rubber sheet as described above, a bond strength (1 kg / 25 mm or more) equal to or higher than that of the adhesive is generated between the liner-tex rubber sheet and the web W. . Due to this adhesive force and the outstanding elastic force peculiar to natural rubber, the tip of the web W bites into the surface of the liner-tex rubber sheet, resulting in a large friction resistance force of about 800 kg / 1400 mm or more, and the tip of the web W moves carelessly. Disappear.

As a result, the lateral displacement amount L, shown in FIG.
H and the vertical displacement amount X shown in FIG. 17 were all far below the specified allowable values, and the vertical displacement amount could be zero.

Further, even a paper tube having a shrinking ability is usually used.
The leading edge of the web W adheres to the web W as an edge mark over 10 laps at the beginning of winding, but by attaching a lineatex rubber sheet, the edge mark disappeared at 2 to 3 laps at the beginning of winding.

A maximum of 500 is wound up in a coil.
The web W of 0 kg is conveyed to the processing line and set on the unwinder. In the unwinder, 100-15
The web W is unwound onto the processing line with a brake tension of 0 kg. Then, when the remaining portion of the web W is unwound until it reaches two to three turns, the unwinding is stopped and the web W is cut. The web W left on the paper tube is removed by the operator, and the paper tube is reused in the production line.

The outline of the PS plate manufacturing process will be described below.

The PS plate is a JIS plate containing aluminum of 99.5% by weight, 0.01% by weight of copper, 0.03% by weight of titanium, 0.3% by weight of iron and 0.1% by weight of silicon.
-A1050 aluminum material with a thickness of 0.30 mm and rolled with 400 mesh pumice stone (manufactured by Kyoritsu Kiln)
Wt% aqueous suspension and rotating nylon brush (6,10-
Nylon) and the surface thereof was grained and then thoroughly washed with water.

This was immersed in a 15% by weight sodium hydroxide aqueous solution (containing 4.5% by weight of aluminum) to perform etching so that the amount of aluminum dissolved was 5 g / m ² , and then washed with running water. Furthermore, neutralize with 1 wt% nitric acid,
Next, in a 0.7% by weight nitric acid aqueous solution (containing 0.5% by weight of aluminum), a rectangular wave alternating waveform voltage (current ratio r = 0.9, voltage at anode: 10.5 V, voltage at cathode: 9.3 V).
0, the current waveform described in JP-B-58-5796) was used to perform electrolytic surface roughening treatment at an anode hour electricity of 160 coulomb / dm ² . After washing with water, 1 at 35 ℃
It was immersed in a 0 wt% sodium hydroxide aqueous solution, etched so that the amount of aluminum dissolved was 1 g / m ² , and then washed with water. Next, it was immersed in a 30% by weight sulfuric acid aqueous solution at 50 ° C., desmutted, and washed with water.

Further, a porous anodic oxide film forming treatment was carried out in a 20% by weight aqueous solution of sulfuric acid (containing 0.8% by weight of aluminum) at 35 ° C. by using a direct current. That is, electrolysis was performed at a current density of 13 A / dm ² , and the anodic oxide film weight was set to 2.7 g / m ² by adjusting the electrolysis time. In order to create a negative lithographic printing plate using a diazo resin and a binder,
This support was washed with water, immersed in a 3% by weight aqueous solution of sodium silicate at 70 ° C. for 30 seconds, washed with water and dried.

[0055] The thus-obtained aluminum support, reflection density was measured with Macbeth RD920 reflection densitometer 0.30, the center line average roughness R _a as defined in JIS B00601 is 0.58μm met It was

Next, methylmethacrylate /
The coating amount of a 1.0 wt% aqueous solution of ethyl acrylate / 2-acrylamido-2-methylpropanesulfonate copolymer (average molecular weight of about 60,000) (molar ratio 50/30/20) was dried by a roll coater. 0.05 g
It was applied so as to be / m ² .

Further, the following photosensitive solution-1 was applied using a bar coater and dried at 110 ° C. for 45 seconds. The dry coating amount was 2.0 g / m ² . Photosensitive solution-1 Diazo resin-1 0.50 g Binder-1 5.00 g Stilite HS-2 (manufactured by Daido Industry Co., Ltd.) 0.10 g Victoria Pure Blue BOH 0.15 g Tricresyl phosphate 0.50 g Dipicolinic acid 0 20 g FC-430 (surfactant manufactured by 3M Co.) 0.05 g Solvent 1-methoxy-2-propanol 25.00 g Methyl lactate 12.00 g Methanol 30.00 g Methyl ethyl ketone 30.00 g Water 3.00 g The above diazo resin-1 Is obtained as follows. First, 29.4 g of 4-diazodiphenylamine sulfate (purity 99.5%) was added to 96% sulfuric acid 70% at 25 ° C.
Slowly added to ml and stirred for 20 minutes. to this,
About 1 part of 3.26 g of paraformaldehyde (purity 92%)
The mixture was gradually added over 0 minutes, and the mixture was stirred at 30 ° C. for 4 hours to allow the condensation reaction to proceed. The condensation molar ratio between the diazo compound and formaldehyde is 1: 1. The reaction product was poured into 2 liters of ice water with stirring and treated with a cold concentrated aqueous solution in which 130 g of sodium chloride was dissolved. The precipitate is collected by suction filtration, the partially dried solid is dissolved in 1 liter of water, filtered, cooled with ice and washed with potassium hexafluorophosphate.
It was treated with an aqueous solution in which g was dissolved. Finally, the precipitate was collected by filtration and air dried to give 1 g of diazo resin-1.

Binder-1 is 2-hydroxyethyl methacrylate / acrylonitrile / methyl methacrylate / methacrylic acid copolymer (weight ratio 50/20/26 /
4, average molecular weight 75,000, acid content 0.4 meq /
g) Water-insoluble, alkaline water-soluble film-forming polymer.

Stilite HS-2 (manufactured by Daido Industry Co., Ltd.)
Is a polymer compound having a higher oil sensitivity than the binder,
It was a copolymer of styrene / maleic acid mono-4-methyl-2-pentyl ester = 50/50 (molar ratio) and had an average molecular weight of about 100,000.

[0060]

EFFECTS OF THE INVENTION Since the present invention has the above-mentioned constitution, it is possible to suppress the winding deviation of the planographic printing plate, and since it has no stain and has a high durability performance, it can be repeatedly used.

[Brief description of drawings]

FIG. 1 is a block diagram of a method of winding a lithographic printing plate using a winding core according to the present embodiment.

FIG. 2 is a perspective view showing a state in which the winding core according to the present embodiment is attached to a winding roller.

FIG. 3 is a front view showing a winding device in which the winding core according to the present embodiment is set and a belt wrapper used at the time of winding.

FIG. 4 is an exploded perspective view of a winding core according to the present embodiment.

FIG. 5 is a perspective view of a winding core according to the present embodiment.

FIG. 6 is a cross-sectional view of a winding core according to the present embodiment.

FIG. 7 is an explanatory diagram showing the operation of the belt wrapper.

FIG. 8 is an explanatory diagram showing the operation of the belt wrapper.

FIG. 9 is an explanatory diagram showing the operation of the belt wrapper.

FIG. 10 is an explanatory diagram showing the operation of the belt wrapper.

FIG. 11 is an explanatory diagram showing the operation of the belt wrapper.

FIG. 12 is an explanatory diagram showing the operation of the belt wrapper.

FIG. 13 is a perspective view showing a wound state of the web.

FIG. 14 is a block diagram showing a conventional lithographic printing plate manufacturing line.

FIG. 15 is a cross-sectional view showing a state where the mat on the surface of the photosensitive layer is crushed.

FIG. 16 is a side view showing a method for inspecting a horizontal web misalignment.

FIG. 17 is a side view showing a method for inspecting a web vertical winding deviation.

[Explanation of symbols]

60 Paper tube (core) 110 Linatex rubber sheet (low temperature vulcanized natural rubber sheet) 112 Vinyl tape (blindfold tape)

Claims (4)

[Claims] 1. A winding core for winding a traveling lithographic printing plate, wherein a low temperature vulcanized natural rubber sheet is attached to the outer peripheral surface of the winding core. 2. The core is a paper tube, and a low temperature vulcanized natural rubber sheet having a thickness of 1.2 mm to 1.8 mm is wound around the outer peripheral surface of the paper tube and adhered with an adhesive to effect low temperature vulcanization. The core according to claim 1, wherein a blind tape is attached to a seam of the natural rubber sheet. 3. The low temperature vulcanized natural rubber sheet is 280
Tensile strength of fg / cm ² or more, elongation at break of 800% or more, permanent set of 10% or less, JISA of 38 ± 2 °
The core according to claim 1 or 2, wherein the hardness, the allowable temperature of -40 to 70 ° C, and the abrasion volume of 1000 wear wheels in an Akron wear test are 0.10 cm ³ or more. 4. A method of winding a lithographic printing plate comprising winding a running lithographic printing plate around a core, wherein a low temperature vulcanizing natural rubber sheet for preventing winding deviation of the lithographic printing plate is attached to an outer peripheral surface of the core. A method of winding a lithographic printing plate characterized by being attached.