JP2003145023A - Dust proof structure for production line of planographic printing plate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the deposition of foreign substance on a photosensitive layer in the coating and the formation of the photosensitive layer on a supporting body. SOLUTION: In the manufacture of a planographic printing plate, the inside static pressure PA, PD, PC and PF of a coating chamber part 32, a drying chamber part 34, a coating casing 20 and a drying furnace part 22, respectively, satisfies a relation of PF>PC>PA>=PD>P0 (P0 is an atmospheric pressure) by static pressure control apparatuses 44 to 50 and the difference of the pressure between PC and PA is controlled to >=1.0 mmAq. As a result, the flow-in of uncleaned air from the outside into the coating chamber part 32 is suppressed and simultaneously the flow-in of the air in the coating chamber part 32 into the coating casing 20 through an opening part such as an inlet part 40 is suppressed and the flow-in of air in the drying chamber part 34 and air in the outside of the apparatus into the drying furnace 22 is also suppressed at the same time while the flow-in of uncleaned air from the outside into the drying chamber part 34 is suppressed.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention is applied to a lithographic printing plate production line for producing a lithographic printing plate by forming a coating layer on a long strip-shaped support to prevent foreign matter from adhering to the coating layer. The present invention relates to a dustproof structure of a lithographic printing plate manufacturing line for preventing the above.

[0002]

2. Description of the Related Art In a lithographic printing plate production line, for example,
While continuously transporting a long strip of aluminum web along a predetermined transport path, after applying a predetermined surface treatment such as graining treatment, etching treatment, anodizing treatment, etc. to the aluminum web, apply this aluminum web A thin film type photosensitive coating layer (hereinafter, simply referred to as “photosensitive layer”) by transporting to a device and applying a photosensitive coating liquid containing an organic solvent, a photosensitive material or the like on the surface of the aluminum web by the coating device. .) Is formed. Then, in the lithographic printing plate production line, the aluminum web on which the photosensitive layer was formed was conveyed to a drying oven, and hot air was blown in the drying oven.
The photosensitive layer is heated and dried using infrared rays, electromagnetic waves, or the like. From the time when the photosensitive coating liquid is applied to the aluminum web until the photosensitive layer formed by the coating liquid is completely dried, the surface of the photosensitive layer is wet and has an adhesive property. Foreign matter such as dust floating in the air is easily attached to the surface. The dust adhering to the photosensitive layer naturally lowers the performance of the lithographic printing plate. Therefore, a lithographic printing plate in which the photosensitive layer adheres to a predetermined quality standard or higher is regarded as a defective product.

Therefore, in a lithographic printing plate production line, a coating device for coating a photosensitive coating liquid on an aluminum web in a factory and a heating / drying device for heating / drying a photosensitive layer are installed in other parts by partition walls or the like. The coating chamber and the drying chamber are divided into parts, and clean air from which foreign matters such as dust are removed by an air filter or the like is supplied to the coating chamber and the drying chamber. As a result, the amount of foreign matter such as dust floating in the coating chamber and the drying chamber can be reduced, so that the coating and drying from the time the photosensitive coating liquid is applied to the aluminum web until the photosensitive layer formed by the coating liquid is dried. At times, it was possible to reduce the amount of foreign matter adhering to the photosensitive layer.

[0004]

In recent years, a lithographic printing plate (CTP) adapted to a direct plate making system for forming an image by a laser beam modulated on the basis of image information has been put into practical use. An image is formed with extremely high accuracy as compared with a printing plate. Therefore, in CTP,
Due to the quality standards, the adhesion of foreign matter such as dust to the photosensitive layer (or the heat sensitive layer) is more severely restricted than before.

However, in the coating chamber and the drying chamber in the lithographic printing plate manufacturing line, at least the inlet and outlet for loading and unloading the aluminum web need to be opened in the partition wall, so that a completely sealed structure is provided. However, uncleaned air flows in through the inlet and outlet of the aluminum web, and dust and the like contained in the air adhere to the photosensitive layer. Therefore, only supplying clean air into the coating chamber and the drying chamber cannot sufficiently reduce the foreign substances adhering to the photosensitive layer so as to stably satisfy the quality standard when manufacturing CTP.

In view of the above facts, an object of the present invention is to provide a dustproof structure for a lithographic printing plate production line, which can effectively reduce the adhesion of foreign matter to the photosensitive layer during coating and formation of the photosensitive layer on the support. Especially.

[0007]

According to the dustproof structure of the lithographic printing plate production line of the present invention, the coating chamber which houses the coating device and is partitioned from the outside by the partition wall, the coating casing, the coating chamber and the inside of the drying oven are provided. And a static pressure adjusting means for adjusting the static pressure. The static pressure adjusting means controls the atmospheric pressure P0, the internal static pressure of the coating casing PC, and the internal static pressure of the coating chamber P.
A, when the internal static pressure of the drying furnace is PF>PF>PC>
PA> P0 and the differential pressure between PC and PA is 1.0m
The internal static pressure PA of the coating chamber is higher than the atmospheric pressure P0, and the internal static pressure PC of the coating casing is adjusted by adjusting the internal static pressures of the coating casing, the coating chamber, and the drying oven so that it becomes equal to or higher than mAq. Since it is higher than the internal static pressure PA of the coating chamber by 1.0 mmAq or more, it is possible to prevent uncleaned air from flowing into the coating chamber from the outside through the openings such as the inlet and the outlet of the support. At the same time
Since the air in the coating chamber is also prevented from flowing into the coating casing, uncleaned air containing foreign matter such as dust enters the coating casing due to the double dustproof structure including the coating chamber and the coating casing. Can be effectively suppressed.

Further, since the internal static pressure of the drying oven is higher than the internal static pressure of the coating casing, it is the most difficult for the air to flow into the drying oven from the outside in the dustproof structure. Even if it is opened directly to the outside of the device, it is possible to reliably prevent the flow of uncleaned air from the outside of the device into the drying furnace.

Therefore, if the cleanliness of the air supplied from the outside to the coating chamber, the coating casing, and the drying furnace is sufficiently high for static pressure adjustment and the like, the air containing foreign matters such as dust will be dried. Since it can be prevented from entering the furnace, it is possible to effectively prevent foreign matters such as dust from adhering to the photosensitive layer after the photosensitive layer is formed on the support and before the photosensitive layer is dried.

[0010]

DETAILED DESCRIPTION OF THE INVENTION A lithographic printing plate manufacturing line to which a dustproof structure according to an embodiment of the present invention is applied will be described below with reference to the drawings.

(Configuration of Embodiment) FIG. 1 shows a planographic printing plate production line according to an embodiment of the present invention. A delivery device (not shown) for a long strip of aluminum web 12 used as a metal support is installed on the most upstream side of the production line 10, and the delivery device has a thickness of 0.1 to 10.
The aluminum web 12 of about 0.6 mm is sent to the downstream side at a traveling speed corresponding to the manufacturing speed of the planographic printing plate in the manufacturing line 10. The production line 10 has 1 aluminum web
A plurality of pass rolls 14 are arranged along the two transport paths, and the pass rolls 14 guide the aluminum web 12 to the downstream side at a predetermined transport speed (manufacturing speed).

In the production line 10, first, it is necessary to correct the shape of the aluminum web 12 sent to the downstream side by the sending device by a straightening device (not shown) such as a roller leveler or a tension leveler in order to improve the flatness. Flatness is obtained. Next, prior to roughening the aluminum web 12, if desired, a degreasing treatment for removing rolling oil on the surface of the aluminum web 12 is performed with, for example, a surfactant, an organic solvent, or an alkaline aqueous solution. The surface roughening treatment of the aluminum plate is carried out by various methods. For example, a method of mechanically roughening the surface, a method of electrochemically melting the surface and a method of selectively melting the surface chemically. It is performed by the method. The roughened aluminum web 12 is optionally subjected to an alkali etching treatment and a neutralization treatment, and then, if desired, subjected to an anodizing treatment in order to enhance water retention and abrasion resistance of the surface. After being subjected to anodizing treatment, the aluminum surface is optionally subjected to hydrophilic treatment.

In the production line 10, as shown in FIG. 1, a device 16 for applying a photosensitive coating liquid to the aluminum web 12 and a heating / drying device 18 are sequentially installed on the downstream side of the anodizing device. Here, the coating device 16 is provided with a casing-shaped coating casing 20 as an outer shell portion thereof, and the heating / drying device 18 is a drying furnace 22 having a casing-like elongated shape along the conveyance direction of the aluminum web 12. Is provided. The coating casing 20 and the drying oven 22 are housed in a dustproof chamber 24.

The dustproof chamber 24 is separated from other portions in the factory where the production line 10 is installed by a dustproof outer wall 26. An inlet portion 28 is formed on the upstream side wall of the dustproof chamber 24, and the aluminum web 12 is carried into the dustproof chamber 24 through the inlet portion 28. Here, the inside of the dustproof chamber 24 is divided into a coating chamber portion 32 and a drying chamber portion 34 by a partition wall 30 installed therein. The coating casing 20 is housed in the upstream coating chamber 32, and the drying chamber 34 is
Most of the drying furnace 22 is accommodated except one end on the upstream side and the other end on the downstream side. The drying oven 22 has one end protruding into the coating chamber 32 through an opening provided in the partition wall 30, and the other end passing through an opening provided in a downstream side wall of the dustproof chamber 24. Projecting to. The application chamber 32 and the drying chamber 34 are each provided with a door (not shown) for the operator to enter and exit, but these doors have sufficient airtightness when they are closed. Is configured.

The coating casing 20 of the coating device 16 includes:
An inlet portion 36 of the aluminum web 12 is opened in the side plate portion on the upstream side, and the aluminum web 12 is passed through the inlet portion 36.
Is carried into the coating casing 20, and a coating portion 38 for the photosensitive coating liquid is arranged in the coating casing 20. The coating portion 38 is, for example, of the aluminum web 12 stretched by the pass roll 14. While the photosensitive coating liquid is being supplied to the surface, the photosensitive coating liquid is spread by a coater to a predetermined thickness to form a photosensitive layer. Here, the aluminum web 12
Immediately after being applied to, the photosensitive layer contains a large amount of organic solvent and is in a mechanically and chemically unstable state.
It is necessary to quickly heat and dry.

An opening is formed at the downstream end of the coating casing 20, and a drying furnace 22 is provided through this opening.
A part of the upstream side of is inserted into the coating casing 20. An inlet 40 and an outlet 42 of the aluminum web 12 are opened at the upstream and downstream ends of the drying furnace 22, respectively. As a result, the coating casing 20 and the drying oven 18 are connected so as to communicate with each other, and the coating device 16
Aluminum web 1 having a photosensitive layer coated by the coating section 38 of
2 is directly transported from the coating casing 20 into the drying furnace 22. Here, the coating casing 20 and the drying oven 22
The connecting portion with and has a sealing structure so as to have airtightness, and the inflow of outside air from the connecting portion into the coating casing 20 is prevented.

The photosensitive layer formed on the aluminum web 12 by the coating device 16 according to the present embodiment includes, for example, a conventional positive printing plate, a conventional negative printing plate, a photopolymer type digital direct printing plate, and a thermal printing plate. Positive type digital direct printing plates, thermal negative type digital direct printing plates are targeted for the photosensitive layer, thermal ablation type unprocessed printing plates,
The organic solvent-based photosensitive layer in a thermal heat-bonding unprocessed printing plate and a lithographic printing plate using a silver salt diffusion transfer method is also applicable.

The drying oven 22 of the heating / drying device 18 is formed in a curved arch shape so as to project upward, and the aluminum web 12 passing through the inside thereof is also projected upward by a plurality of pass rolls 14. It is conveyed to the downstream side while having a curved arch shape. An air supply duct (not shown) for blowing hot air into the drying furnace 22 is connected to the inside of the drying furnace 22, and an exhaust duct (not shown) for discharging hot air flowing along the aluminum web 12 from the inside of the drying furnace 22 (not shown). Omitted) is connected. Here, the hot air generator (not shown) connected to the drying furnace 22 through the air supply duct,
The air purified by an air filter or the like is heated and supplied into the drying furnace 22.

The aluminum web 12 on which the photosensitive layer has been coated and formed by the coating unit 38 is conveyed from the coating casing 20 into the drying furnace 22, moves downstream in the drying furnace 22, and along the surface of the photosensitive layer. It is heated and dried by flowing hot air. The temperature of the hot air supplied into the drying oven 22 is usually 50 depending on the type of the photosensitive layer (lithographic printing plate).
It is adjusted within the range of ℃ to 120 ℃. The aluminum web 12 having the photosensitive layer thus heated and dried is carried out of the drying furnace 22 through the outlet 42.

In the production line 10, static pressure adjusting devices 44 and 46 respectively connected to the coating chamber portion 32 and the drying chamber portion 34 of the dustproof chamber 24, and the coating casing 20 of the coating device 16.
And static pressure adjusting devices 48 and 50 connected to the drying furnace 22 of the heating / drying device 18, respectively. These static pressure adjusting devices 44 to 50 have basically a common structure, and the internal static pressures of the coating chamber section 32, the drying chamber section 34, the coating casing 20 and the drying furnace 22 are each higher than the atmospheric pressure P0. Adjust to the target pressure of. Static pressure adjustment device 44-50
An air supply fan 52 and an exhaust fan 54 are provided in each.

The air supply fan 52 and the exhaust fan 54 include
One ends of the air supply duct 56 and the exhaust duct 58 are connected to each other. The other ends of the ducts 56 and 58 are connected to the coating chamber 32, the drying chamber 34, the coating casing 20, and the drying oven 22, respectively. Dampers 60 and 62 are arranged in the middle of the ducts 56 and 58, respectively. By adjusting the openings of these dampers 60 and 62, the amount of air flowing in the ducts 56 and 58 (ventilation amount) or ventilation. The resistance is controllable. Further, in the air supply duct 56,
An air filter 6 is provided between the air supply fan 52 and the damper 60.
4 is arranged, and the air cleaned by the air filter 64 is supplied into the coating chamber 32, the drying chamber 34, the coating casing 20, and the drying furnace 22.
The air filter 64 removes dust and foreign matter such as treatment liquid particles used in other processes from the air supplied from the air supply fan 52. Specifically, the air filter 64 is
At least 99.9% of suspended particles with a particle size of 0.3 μm or more
It has the ability to remove above.

The coating chamber section 3 is controlled by the static pressure adjusting devices 44 to 50.
2, drying chamber 34, coating casing 20 or drying oven 22
When the internal static pressure is increased, the opening degree of the damper 60 is increased and the opening degree of the damper 62 is decreased at the same time according to the target increase amount of the static pressure. As a result, the ventilation resistance in the air supply duct 56 decreases, and at the same time, the ventilation resistance in the exhaust duct 58 increases, so that the coating chamber 32 and the drying chamber 3
4. The internal static pressure of the coating casing 20 or the drying oven 22 rises. On the contrary, the coating chamber 32, the drying chamber 34,
When lowering the internal static pressure of the coating casing 20 or the drying oven 22, the damper 6 is adjusted according to the target amount of decrease in static pressure.
The opening degree of 0 is decreased and at the same time the opening degree of the damper 62 is increased. As a result, the airflow resistance in the air supply duct 56 increases, and at the same time, the airflow resistance in the exhaust duct 58 decreases, so that the coating chamber 32, the drying chamber 34, and the coating casing 2 are provided.
0 or the internal static pressure of the drying furnace 22 decreases.

The coating chamber 32, the drying chamber 34, the coating casing 20 and the drying furnace 22 are provided with static pressure gauges 66, 67, 68 and 69, respectively, for measuring the internal static pressure. These static pressure gauges 66 to 69 are provided with a signal conversion unit that converts a measurement signal of internal static pressure into an electric signal, and the measurement signal made into an electric signal by this signal conversion unit controls the manufacturing line 10. Is output to the controller 70. Target values of internal static pressures for the coating chamber 32, the drying chamber 34, the coating casing 20, and the drying oven 22 are preset in the controller 70.
0 is the coating chamber 32, the drying chamber 34, the coating casing 2
The opening degrees of the dampers 60 and 62 are respectively controlled (feedback control) based on the measurement signals from the static pressure gauges 66 to 69 so that the internal static pressure of 0 and the drying furnace 22 become the target value (target static pressure).

The opening degree of the dampers 60 and 62 is controlled, and the air supply amount by the air supply fan 52 and the exhaust fan 5 are controlled.
It is also possible to control the exhaust amount by means of No. 4, and in addition to controlling the opening degree of the dampers 60, 62 in this way,
By controlling the air supply amount and the exhaust amount of No. 4, the adjustment range of the internal static pressure in the coating chamber 32, the drying chamber 34, the coating casing 20, and the drying furnace 22 can be expanded. Further, based on the internal static pressure measured by the static pressure gauges 66 to 69,
The operator may manually adjust the opening degrees of the dampers 60 and 62 to adjust the internal static pressures of the coating casing 20, the coating chamber 32, the drying oven 22, and the drying chamber 34.

In the production line 10, an air-cooling type cooling device (not shown) is installed downstream of the heating / drying device 18. This cooling device is provided with, for example, a cooling tank in the form of an elongated casing along the transport path of the aluminum web 12, and a cooling air generator for supplying cooling air in a low temperature state into this cooling tank. When the aluminum web 12 is conveyed inside, the aluminum web 12 and the photosensitive layer are cooled by cooling air. At this time, the cooling device is, for example, the aluminum web 12
The upper photosensitive layer is cooled to 40 ° C. or lower. Further, in the production line 10, PVA (polyvinyl alcohol) or the like is further applied on the photosensitive layer on the downstream side of the cooling device, if necessary, for the purpose of blocking oxygen, etc., to form an overcoat layer. At this time, since the surface temperature of the photosensitive coating on the aluminum web 12 is 40 ° C. or less, coating unevenness does not occur in the overcoat layer, and the overcoat layer is quickly cured.

In the production line 10, the production of a product web as a lithographic printing plate material is completed by performing the above steps, and the product web is taken up by a web winding device (not shown) arranged at the end of the line. Take up in a roll. This product web is supplied to a lithographic printing plate processing line, pasted with protective interleaving paper, cut into a required product size, etc. to produce a lithographic printing plate as a product.

(Operation of Embodiment) Next, the dustproof structure of the manufacturing line 10 according to the present embodiment configured as described above will be described. The controller 70 uses the manufacturing line 10
During the production of the planographic printing plate by the
〜50 are operated respectively, and static pressure gauge 66-69
By adjusting the openings of the dampers 60, 62 of the static pressure adjusting devices 44 to 50 based on the measurement signal from the coating chamber section 3
2, drying chamber 34, coating casing 20 and drying oven 22
The internal static pressure of the target static pressure PA, PD, PC, PF respectively
To control.

At this time, the target static pressure (gauge pressure) of the coating casing 20, the coating chamber 32, the drying oven 22 and the drying chamber 34 is 0 mmAq≤PA≤1.0 mmAq, 0.5 m.
mAq ≦ PC ≦ 4.0 mmAq, 1.0 mmAq ≦ PF
≦ 8.0 mmAq and 0 mmAq ≦ PD ≦ 2.0 mm
Within the range of Aq, the relations of PF>PC> PA ≧ PD> P0 are satisfied, and the pressure difference between PC and PA is set to 1.0 mmAq or more. In this embodiment,
For example, target static pressures PF, PC, PA, PD are 4.0 mmAq, 2.0 mmAq, 1.0 mmAq, respectively.
It is set to 0.5 mmAq.

As described above, in the dustproof structure of the manufacturing line 10 according to the present embodiment, the dustproof chamber 24 partitioned from the outside by the dustproof outer wall 26 is provided, and the dustproof chamber 24 is coated by the partition wall 30. A coating chamber 32 for storing 20 and a drying chamber 3 for storing a drying oven 22.
4, and the internal static pressures of the coating casing 20, the coating chamber 32, the drying furnace 22 and the drying chamber 34 are controlled to PF, PC, PA and PD, respectively.

According to the dustproof structure of the production line 10 according to the present embodiment, the internal static pressure of the coating chamber 32 is controlled to PA higher than the atmospheric pressure P0, and the internal static pressure of the coating casing 20 is controlled to the coating chamber. By controlling the PC to have a higher static pressure than the internal static pressure of the portion 32, it is possible to suppress the flow of uncleaned air from the outside into the coating chamber portion 32 through the openings such as the inlet portion 36. The air in the coating chamber 32 passes through the openings such as the inlet 40 and the coating casing 2
Since the double dustproof structure including the coating chamber 32 and the coating casing 20 prevents uncleaned air containing foreign matters such as dust from entering the coating casing 20, Can be effectively suppressed.

At this time, the target static pressure PC of the coating casing 20 is 1.0 mmA higher than the target static pressure PA of the drying chamber section 34.
By setting it higher than q, it is possible to generate a steady air flow flowing out of the coating casing 20 into the coating chamber 32.
It becomes possible to almost completely prevent uncleaned air from entering the coating casing 20. In addition, the flow of air in the dust-proof chamber 24 is as follows.
When the application is stopped, the static pressure adjusting devices 44 to 50 are used to apply the coating chamber 3
2, drying chamber 34, coating casing 20 and drying oven 22
It is confirmed by smoking inside the coating casing 20 or the drying furnace 22 while observing the inside of each of the target static pressures PA, PD, PC, and PF, and observing the smoke flow generated thereby.

Further, the static pressure inside the drying chamber 34 is set to the atmospheric pressure P.
By controlling the PD to be higher than 0 and controlling the internal static pressure of the drying furnace 22 to be PF higher than the internal static pressure of the drying chamber 34 and the coating casing 20, the drying chamber 34 is controlled.
At the same time that uncleaned air is prevented from flowing into the inside of the apparatus from the inside of the apparatus, air inside the drying chamber 34 and air outside the apparatus is also prevented from flowing into the drying furnace 22. Due to the double dust-proof structure including the drying chamber portion 34 and the drying oven 22, the air not cleaned is dried by the drying oven 2.
It is possible to effectively suppress the invasion into the inside of 2.

At this time, the internal static pressure PF of the drying furnace 22 is higher than the internal static pressure of the coating casing 20, and the air is most difficult to flow into the drying furnace 22 from the outside in the dustproof structure. Even if the outlet portion 42 of the drying furnace 22 is directly opened to the outside of the apparatus, it is possible to reliably prevent the unpurified air from flowing into the drying furnace 22 from the outside of the apparatus. Further, a flow of air flowing into the coating casing 20 from the inside of the drying furnace 22 is generated, but since the air in the drying furnace 22 is purified, there is a problem even if this air flows into the coating casing 20. Absent.

Therefore, the manufacturing line 10 according to the present embodiment.
According to the dustproof structure of No. 3, the coating chamber section 3 is used for static pressure adjustment and the like.
2, coating casing 20, drying chamber 34 and drying oven 22
If the cleanliness of the air supplied to the outside is sufficiently high, it is possible to prevent uncleaned air containing foreign matter such as dust from entering the coating casing 20 and the drying oven 22, and thus the aluminum web 12 It is possible to effectively prevent foreign matter such as dust from adhering to the photosensitive layer after the photosensitive layer is formed on the photosensitive layer and before the photosensitive layer is dried.

In the present embodiment, the case where the dustproof structure of the manufacturing line 10 is applied to the coating device 16 and the heating / drying device 18 has been described. However, such a dustproof structure is better than that of the heating / drying device 18 in the manufacturing line 10. It may be applied to the downstream portion. In this case, a dustproof structure which covers the aluminum web 12 along the transport direction and communicates with each other is provided also in a portion of the manufacturing line 10 on the downstream side of the heating / drying device 18 to prevent internal static pressure of the upstream dustproof structure. On the other hand, the internal static pressure of the dustproof structure on the downstream side should be increased. In addition to this, the dustproof structure according to the present embodiment may be applied to a lithographic printing plate processing line for cutting the product web to process the product web into a lithographic printing plate. In this case, dust and the like in the processing line are generated from the product web itself. The part of the product web on the downstream side of the cutting device is divided into a plurality of blocks along the transport direction, and the blocks cover the product web. At the same time, a dustproof structure communicating with each other is provided, and the internal static pressure of the dustproof structure of the downstream block is made higher than the internal static pressure of the dustproof structure of the upstream block. Furthermore, in such a dustproof structure, the most upstream block has a double dustproof structure, and the internal static pressure of the inner dustproof structure is made higher than the internal static pressure of the outer dustproof structure, which greatly increases the dustproof capacity. Can be improved.

[0036]

As is clear from the above description, according to the dustproof structure of the lithographic printing plate production line of the present invention, it is possible to effectively prevent foreign substances from adhering to the photosensitive layer during coating and formation of the photosensitive layer on the support. It can be reduced.

[Brief description of drawings]

FIG. 1 is a side view showing a configuration of a lithographic printing plate production line to which a dustproof structure according to an embodiment of the present invention is applied.

[Explanation of symbols]

10 production line 12 Aluminum web (support) 16 Coating device 18 Heat dryer 20 Coating casing 22 Drying oven 24 Dustproof room 26 Dust-proof outer wall (partition wall) 30 partition walls 32 coating chamber 34 Drying room 38 coating section (coating device) 44 Static pressure adjusting device (static pressure adjusting means) 46 Static pressure adjusting device (static pressure adjusting means) 48 Static pressure adjusting device (static pressure adjusting means) 50 Static pressure adjusting device (static pressure adjusting means) 52 Air supply fan (static pressure adjustment means) 54 Exhaust fan (static pressure adjustment means) 56 Air supply duct (static pressure adjustment means) 58 Exhaust duct (static pressure adjusting means) 60 damper (static pressure adjustment means) 62 damper (static pressure adjusting means)

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) G03F 7/16 501 G03F 7/16 501 F term (reference) 2H025 AB03 EA04 2H096 AA06 CA12 CA20 LA30 2H114 GA02 4D075 BB24Z BB56Z DA04 DB07 DC27 EA07 EA45 4F042 AA22 DB03 DB17 DB32 DB37 DB40 DE01 DE06 DE10

Claims (3)

[Claims] 1. A coating device that coats a coating liquid containing an organic solvent on a long strip-shaped support that is transported along a predetermined transport path to form a coating layer, and a coating device installed downstream of the coating device. And provided in a lithographic printing plate production line equipped with a drying device for drying the coating layer formed on the support by the coating device, and intrusion of foreign matter such as dust into the coating device and the drying device. A dustproof structure for preventing the above, which constitutes an outer shell portion of the coating device, and a coating casing in which a coating portion for coating the coating liquid on the support is arranged, and a partition wall for accommodating the coating device. A coating chamber that is partitioned from the outside by a coating device provided in the drying device, the upstream end of which is connected to the coating casing, and the support on which the coating layer is formed passes through the inside. A case-shaped drying oven in which the layers are heated and dried, and the coating case. Sing, and a static pressure adjusting means for adjusting the internal static pressure of the coating chamber and the drying furnace, respectively, the atmospheric pressure P0, the internal static pressure of the coating casing PC,
When the internal static pressure of the coating chamber is PA and the internal static pressure of the drying furnace is PF, the static pressure adjusting means is PF>PC> P.
A> P0 and the differential pressure between PC and PA is 1.0 mm
A dustproof structure of a lithographic printing plate production line, wherein internal static pressures of the coating casing, the coating chamber, and the drying oven are adjusted so as to be Aq or more. 2. The static pressure adjusting means is 0 mmAq ≦ PA.
≦ 1.0 mmAq, 0.5 mmAq ≦ PC ≦ 4.0 mm
The dustproof structure of the lithographic printing plate production line according to claim 1, wherein Aq and 1.0 mmAq≤PF≤8.0 mmAq. 3. The static pressure adjusting means adjusts the internal static pressure of the coating casing, the coating chamber, and the drying furnace together with the internal static pressure of a drying chamber that houses the drying device and is partitioned from the outside by a partition wall. When the internal static pressure of the drying chamber is PD, PF>PC> PA ≧ PD> P0 is satisfied, and the dustproof structure of the lithographic printing plate production line according to claim 1 or 2.