JP2003040501A - Suction packing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent occurrence of breaking of an aluminum web at suction of the web and prevent failure due to impasto in a coating step. SOLUTION: A sponge packing 26 including a frame portion 26A contacts closely an aluminum web W and defines a negative pressure chamber by enclosing the suction surface. The R(roundness) dimension of the corner, hardness, and thickness of the frame portion 26A of the sponge packing 26 are adjusted suitably in accordance with the thickness of the aluminum web W instead of using the same sponge packing irrespective of the thickness of the aluminum web W. Accordingly, a sheet material sucked to the corner portion is prevented from breaking.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a suction packing (suction pad) used in a suction conveyance device that sucks and conveys a sheet material such as an aluminum web.

[0002]

2. Description of the Related Art A manufacturing line of a photosensitive lithographic printing plate comprises a surface treatment step, a coating step, a drying step, etc., and as shown in FIG. And the aluminum web W having a thickness are conveyed to a surface treatment step by a delivery device, and then, after a coating step and a drying step, a photosensitive core is set as a photosensitive lithographic printing plate on a winding core set on a winding shaft of a winding device. Being rolled up.

By the way, in order to continuously run the aluminum web, the tip end of the new coiled aluminum web W2 standing on the preparation table 16 is sucked by the suction box 18 (see FIG. 12), and the suction table 14 is moved. Carry it to and place the tip of the aluminum web W2. Then, when the coiled aluminum web W1 being sent approaches the end,
The aluminum web W1 is adsorbed on the adsorption table 19, the aluminum web W1 is cut by a cutter (not shown), and the aluminum web W2 placed on the adsorption table 14 is joined by the joining machine 21. Can be continuously sent to the production line.

By the way, as shown in FIG. 13, conventionally, a sponge packing 24 (adsorption packing) having a closed cell structure is provided on the surface of the urethane rubber sheet 22 as the adsorption surface of the adsorption box 18 in order to improve the adsorbability. Installed. The sponge packing 24 is composed of a frame portion 24A whose central portion is open in order to form a plurality of negative pressure chambers with the urethane rubber sheet 22.

However, such a sponge packing 24
When a thin aluminum web having a thickness of 0.1 mm is adsorbed by using, a wrinkle S is generated on the aluminum web W at the corner portion C of the frame portion 24A and the aluminum web W is broken as shown in FIG. In this way, when the aluminum web W is broken,
There is a problem that the coating solution becomes thick during the coating process.

[0006]

SUMMARY OF THE INVENTION In consideration of the above facts, the present invention has an object to prevent the occurrence of breakage during adsorption of an aluminum web and prevent thick coating failure in the coating step.

[0007]

According to a first aspect of the present invention, there is provided a suction packing which is attached to a suction surface of a suction box of a suction conveyance device which sucks and conveys a sheet material such as an aluminum web. R dimension of the corner of the frame part that closely adheres to the material and surrounds the suction surface to form a negative pressure chamber,
The hardness of the frame portion and the thickness of the frame portion are selected according to the thickness of the sheet material so that the sheet material adsorbed at the corners is not bent.

According to the first aspect of the present invention, the same suction packing is used regardless of the thickness of the sheet material as in the conventional case, and the sheet material is not sucked, but according to the thickness of the sheet material. The sheet adsorbed to the corner portion by appropriately selecting the R dimension of the corner of the frame portion that closely adheres to the sheet material and surrounds the suction surface to form the negative pressure chamber, the hardness of the frame portion, and the thickness of the frame portion. The material does not break.

According to a second aspect of the present invention, the thickness of the sheet material to be adsorbed is 0.1 mm, and the hardness H of the frame portion is H.
(JISK7312 / SRIS0101) 0 <H ≦ 1
When the angle is 0 degree, the R dimension of the corner of the frame is 0 ≦
R ≦ 30 mm, frame part thickness t is 0 mm <t ≦ 4 m
The suction packing according to claim 1, wherein the suction packing is selected from the range of m.

According to a third aspect of the present invention, the thickness of the sheet material to be adsorbed is 0.1 mm, and the hardness H of the frame portion is H.
(JISK7312 / SRIS0101) 10 <H ≦
When the angle is 30 degrees, the R dimension of the corner of the frame is 0
≦ R ≦ 30 mm, frame thickness t is 0 mm <t ≦ 4
mm selected from the range.
Adsorption packing described in.

According to a fourth aspect of the present invention, the thickness of the sheet material to be adsorbed is 0.1 mm, and the hardness H of the frame portion is H.
(JISK7312 / SRIS0101) 30 <H ≦
When the angle is 50 degrees, the R dimension of the corner of the frame is 0
≦ R ≦ 30 mm, frame thickness t is 0 mm <t ≦ 4
mm selected from the range.
Adsorption packing described in.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION A suction packing according to this embodiment will be described below with reference to the drawings.

As shown in FIGS. 1 and 2, the sponge packing (suction packing) 26 is attached to the suction surface side of the suction box 18. The suction box 18 is a rectangular box having a short height and a closed shape, and a plurality of suction ports 20 are formed on the bottom surface 18A. A flexible suction hose 30 is connected to the ceiling surface 18B.

As shown in FIG. 4, the suction hose 30
Is connected to a vacuum pump 32, and this vacuum pump 3
By driving 2, the inside of the suction box 18 is brought into a negative pressure state, and a suction force is generated at the suction port 20. The suction hose 30 is provided with an electromagnetic valve 36 controlled by the control device 34. By operating this electromagnetic valve 36, a suction force is generated or released in the suction box 18. .

On the other hand, a urethane rubber sheet 22 is attached over the entire bottom surface 18A of the suction box 18. The urethane rubber sheet 22 has a suction port 2
Circular suction holes 22A are formed in a grid pattern at positions corresponding to 0. The urethane rubber sheet 22 prevents the aluminum web W from being scratched by the suction holes 22A.

Further, the urethane rubber sheet 22 has a structure shown in FIG.
A large opening and a sponge packing 26 in which two openings are distributed to the left and right are attached to the central portion as shown in FIG. Then, R is formed at the corner portion of the frame portion 24A forming the opening.

By adhering the sponge packing 26 to the urethane rubber sheet 22 and forming a plurality of negative pressure chambers between the urethane rubber sheet 22 and the urethane rubber sheet 22, the adsorption of the aluminum web W can be improved. In addition, sponge packing 2
6 has a closed cell structure, and as an example, nitrile rubber (NBR) can be used as the material.

Here, a suction conveyance device using the sponge packing 26 will be described.

As shown in FIG.
Adsorbs the aluminum web W2 wound on the winding core 12,
It plays a role of transporting to the suction table 14.

The step of joining the aluminum webs will be described in order. Since the aluminum webs are continuously run, the tip of the aluminum web W2 sent to the production line is adsorbed by the preparation table 16. On the ceiling surface 16A of the preparation table 16,
A plurality of suction holes 17 are formed, and the bottom surface 16B
A suction pipe 48 is connected to the. The suction pipe 48 is connected to the vacuum pump 44, and by operating an electromagnetic valve 50 controlled by the controller 34, the preparation table 16 adsorbs or releases adsorption of the aluminum web W2.

Next, as shown in FIGS. 5 to 7, the suction box 18 attached to the robot arm sucks the aluminum web W2 onto the preparation table 16 and at the same time, the preparation table 16
Then, the suction force of the aluminum web W2 is released and the tip of the aluminum web W2 is sucked onto the suction table 14.

A plurality of suction holes 15 are formed in the ceiling surface 14A of the suction table 14, and the bottom surface 1
A suction pipe 42 is connected to 4B. The suction pipe 42 is connected to a vacuum pump 44, and by operating an electromagnetic valve 46 controlled by the control device 34, the suction table 14 sucks or cancels suction of the aluminum web W1. As shown in FIG. 7, the suction box 18 returns to the original position after the aluminum web W2 is placed on the suction table 14.

On the other hand, when the fed coil-shaped aluminum web W1 approaches the end, the aluminum web W1 is sucked onto the suction table 19 as shown in FIG. A plurality of suction holes 23 are formed on the ceiling surface 19A of the suction table 19 (see FIG. 5), and a suction pipe 27 is connected to the bottom surface 19B. The suction pipe 27 is connected to the vacuum pump 32, and by operating the solenoid valve 29 controlled by the control device 34,
The suction table 19 is configured to suck or release the aluminum web W1.

Next, the aluminum web W is cut with a cutter (not shown).
After cutting 1, the aluminum web W1 and aluminum web W2
Butt against each other and joined by the joining machine 21, and the suction table 14
Release the suction of the suction table 19 and the aluminum web W
2 is sent to the production line.

Here, how the aluminum web W can be prevented from being broken by changing the hardness of the sponge packing used in the suction box, the R dimension of the corner portion, and the thickness according to the thickness of the aluminum web. Tested and saw.

As the test conditions, the thickness of the aluminum web W is 0.1 mm, the outer size of the sponge packing is W: 450 mm × L: 1050 mm, and the width S of the frame portion is S.
1 is 30 mm, the width S2 of the partition placed inside is 75
mm (see FIG. 3). The suction pressure applied to the adsorption box was 35 cmHg.

As shown in FIG. 9A, the sponge packing has a hardness (JISK7312 / SRIS0101) of 1
In test 1 with 0 degree, R dimension is 20mm, 30mm
In the case of, the thickness is in the range of 1 mm to 4 mm and is good (◯), and the aluminum web does not break. Also, the thickness is 1m
If m, even if 0 ≦ R (R = 0 means that the corners are not rounded), the aluminum web does not break such that it cannot be used.

Further, as shown in FIG. 9B, in the test 2, the hardness of the sponge packing (JISK7312 /
SRIS0101) is 30 degrees and R dimension is 30
In case of mm, thickness is good in the range of 1 mm to 4 mm (○)
Therefore, the aluminum web does not break. Further, if the thickness is 1 mm, even if 0 ≦ R, the aluminum web will not break such that it cannot be used. But test 1
Comparing with, it can be seen that it is necessary to reduce the thickness as the hardness increases.

As shown in FIG. 9C, in the test 3,
Hardness of sponge packing (JISK7312 / SRIS
0101) is 50 degrees, and when the R dimension is 30 mm, the thickness is in the range of 1 mm to 4 mm, which is good (◯) and usable (Δ), and the aluminum web does not break. Further, if the thickness is 1 mm, even if 0 ≦ R, the aluminum web will not break such that it cannot be used. However, as compared with the test 2, it can be seen that the thickness needs to be reduced as the hardness increases.

From the above test results, it is understood that when the R dimension is as large as possible, the aluminum web is less likely to be broken, the sponge packing is soft, and when the R dimension is thin, the aluminum web is less likely to be broken.

Next, the hardness of the sponge packing, the R dimension,
By changing the thickness condition, a running test was performed to see the adsorption state of the aluminum web.

As shown in FIG. 10, in Example 1, the pressure applied to the adsorption box was 35 cmHg, the hardness of the sponge packing was 50 degrees, the thickness was 4 mm, and the R dimension of the corner portion was 10 mm.

Under the above-mentioned conditions, the aluminum web having a thickness of 0.1 mm was broken 14 times by 50 times of the suction operation, but all were usable. Also, 0.15
With the aluminum web of mm, the folding occurred 6 times.

In the second embodiment, the pressure applied to the suction box is 35 cmHg, and the hardness of the sponge packing is 3.
The degree was 0 degrees, the thickness was 2 mm, and the R dimension of the corner portion was 10 mm.

Under the above-mentioned conditions, the aluminum web having any thickness did not break after 50 suction operations.

From the above tests and examples, it can be said that the practical specifications of the sponge packing preferably satisfy any one of the following conditions.

Condition 1: Hardness H: H ≦ 10, thickness t: 0 m
m <t ≦ 1 mm, R dimension of corner portion: R ≧ 0 mm.

Condition 2: Hardness H: H≤10, thickness t: 1 m
m <t ≦ 4 mm, R dimension of corner portion: R ≧ 5 mm.

Condition 3: Hardness H: 10 <H ≦ 30, thickness t: 0 mm <t ≦ 1 mm, R dimension of corner: R ≧ 0
mm.

Condition 4: Hardness H: 10 <H ≦ 30, thickness t: 1 mm <t ≦ 2 mm, R dimension of corner portion: R ≧ 5
mm.

Condition 5: hardness H: 10 <H ≦ 30, thickness t: 2 mm <t ≦ 3 mm, R dimension of corner portion: R ≧ 1
0 mm.

Condition 6: Hardness H: 10 <H ≦ 30, thickness t: 3 mm <t ≦ 4 mm, R dimension of corner portion: R ≧ 2
0 mm.

Condition 7: hardness H: 30 <H ≦ 50, thickness t: 0 mm <t ≦ 1 mm, R dimension of corner portion: R ≧ 0
mm.

Condition 8: Hardness H: 30 <H ≦ 50, thickness t: 1 mm <t ≦ 2 mm, R dimension of corner part: R ≧ 5
mm.

Condition 9: hardness H: 30 <H ≦ 50, thickness t: 2 mm <t ≦ 3 mm, R dimension of corner portion: R ≧ 1
0 mm.

Condition 10: Hardness H: 30 <H ≦ 50, Thickness t: 3 mm <t ≦ 4 mm, R dimension of corner part: R ≧ 3
0 mm.

In this embodiment, Asker C manufactured by Kobunshi Keiki Co., Ltd. is used as a hardness meter for measuring the hardness of the sponge packing. This is because the force of a spring presses a push needle of a specified shape against the surface of the sample (sponge packing) to deform it, and the depth of push of the push needle when the resistance force and spring force shown by the sample are balanced. Is expressed as a hardness by a relative value from 0 to 100.

Here, the outline of the manufacturing process of the PS plate will be described.

The PS plate contains JIS 99.5 wt% aluminum, 0.01 wt% copper, 0.03 wt% titanium, 0.3 wt% iron, and 0.1 wt% 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 by using a direct current in a 20% by weight aqueous solution of sulfuric acid (containing 0.8% by weight of aluminum) at 35 ° C. 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 prepare a negative photosensitive 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.

[0052] 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 a 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.

[0057]

EFFECTS OF THE INVENTION Since the present invention has the above-described structure, it is possible to prevent the occurrence of breakage during adsorption of an aluminum web and prevent thick coating failure during the coating process.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing a suction box in which a suction packing according to the present embodiment is used.

FIG. 2 is a sectional view of a suction box in which a suction packing according to the present embodiment is used.

FIG. 3 is a plan view of a suction packing according to the present embodiment.

FIG. 4 is an explanatory view of a suction conveyance device using a suction packing according to the present embodiment.

FIG. 5 is an explanatory view of a suction conveyance device using a suction packing according to the present embodiment.

FIG. 6 is an explanatory diagram of a suction conveyance device using the suction packing according to the present embodiment.

FIG. 7 is an explanatory diagram of a suction conveyance device using the suction packing according to the present embodiment.

FIG. 8 is an explanatory diagram of a suction conveyance device using the suction packing according to the present embodiment.

FIG. 9 is a table showing test results of the suction packing according to the present embodiment.

FIG. 10 is a table showing test results of the suction packing according to the present embodiment.

FIG. 11 is an explanatory diagram of a suction conveyance device using a conventional suction packing.

FIG. 12 is a plan view showing a state in which a conventional suction packing sucks an aluminum web.

FIG. 13 is a cross-sectional view showing a state where a conventional suction packing sucks an aluminum web.

FIG. 14 is a conceptual diagram showing a suction mark of a conventional suction packing.

[Explanation of symbols]

26 Sponge packing (suction packing) 26A frame part

Claims (4)

[Claims] 1. A suction packing which is attached to a suction surface of a suction box of a suction conveyance device which sucks and conveys a sheet material such as an aluminum web, and which is in close contact with the sheet material and surrounds the suction surface to form a negative pressure chamber. The R dimension of the corner of the frame portion to be formed, the hardness of the frame portion, and the thickness of the frame portion are selected according to the thickness of the sheet material so that the sheet material adsorbed at the corner portion does not break. Characteristic suction packing. 2. The sheet material to be adsorbed has a thickness of 0.1 m.
m, hardness H of the frame portion (JISK7312 / SR
When IS0101) is 0 <H ≦ 10 degrees, the R dimension of the corner of the frame part is selected from the range of 0 ≦ R ≦ 30 mm, and the thickness t of the frame part is selected from the range of 0 mm <t ≦ 4 mm. The suction packing according to claim 1. 3. The thickness of the adsorbing sheet material is 0.1 m.
m, hardness H of the frame portion (JISK7312 / SR
When IS0101) is 10 <H ≦ 30 degrees, the R dimension of the corner of the frame part is selected from the range of 0 ≦ R ≦ 30 mm, and the thickness t of the frame part is selected from 0 mm <t ≦ 4 mm. The suction packing according to claim 1. 4. The thickness of the adsorbing sheet material is 0.1 m.
m, hardness H of the frame portion (JISK7312 / SR
When IS0101) is 30 <H ≦ 50 degrees, the R dimension of the corner of the frame part is selected from the range of 0 ≦ R ≦ 30 mm and the thickness t of the frame part is selected from 0 mm <t ≦ 4 mm. The suction packing according to claim 1.