JP2006255559A - Clean booth - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a clean booth capable of performing a maintenance of a coater in the clean booth in a relatively short period of time so that cleanliness in the clean booth is not significantly reduced and compactness is not so greatly impaired and coating a sheet object running continuously. <P>SOLUTION: The clean booth comprises: a door 8 having an inlet 2 and an outlet 3 through which a sheet object 4 running in a substantially horizontal direction is continuously passed and provided on a wall surface of a non-closed type clean booth 1 having a coater 5 for coating the running sheet object 4 therein; and a moving means 6 for moving the coater 5 to the vicinity of the door 8. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a clean booth in which a traveling sheet can continuously pass and the inside can be cleaned. More specifically, the present invention relates to a clean booth that has a coating device inside and can perform coating with high cleanliness.

  In recent years, coating technology has been applied to display materials, video display fields such as functional films, information recording fields such as magnetic tapes, paper fields such as inkjet paper, automobile body coating fields, and electrical / electronics such as thin film batteries and electronic circuit boards. It is used in many fields such as electronics-related fields, optical-related fields such as eyeglass lenses, and functional fiber fields such as water repellency, waterproofing and deodorization, and the required performance is increasing year by year. Especially in the high-tech industry, contamination of fine dust and dust in products can be a fatal defect in quality and appearance, so coating in a highly clean environment has become an essential condition. .

  In order to create a highly clean environment, a clean booth that can improve the cleanliness inside the partition by partitioning the coating process from the outside with conductive members and sending clean air into the interior is used. . Furthermore, it is desirable to make the coating process unattended.

  The shape of the clean booth varies depending on the size of the object to be coated, the coating method, the flow state of clean air, etc., but it is more economical to make the size preferably compact.

  For example, as one method for coating a sheet-like material, there is an air knife coating method in which a coating liquid is supplied onto the sheet-like material and the coating solution is thinned by blowing high-speed air. In this coating method, there is a risk that the film thickness may fluctuate due to changes in the coating liquid adhesion or lip clearance to the lip part that blows out high-speed air. It is necessary to stop the process and perform maintenance such as wiping the lip and adjusting the clearance. Considering this maintainability, the clean booth has to be of a size that allows humans to enter, or when the clean booth has a compact size for maintenance, the coating device must be taken out of the clean booth.

  When people enter the clean booth and perform maintenance, there is concern about dust and dust adhering to clothes, etc., and an air shower etc. is installed in the front room of the clean booth to prevent dust and dust from entering. This is a demerit in terms of cleanliness and economy.

  In addition, when taking out the coating device outside during maintenance, it is necessary to open one side or several sides of the clean booth and remove it. It takes time to return to the cleanliness level. Further, a coating apparatus for a sheet-like material that travels in a substantially horizontal direction usually has a means that can adjust the clearance with the sheet-like material (an elevating means that can move vertically with respect to the sheet-like material). However, the means having both this means and the means for taking out the coating apparatus (taken out in the lateral direction) has a complicated structure and is equivalent to the size (length) of the coating apparatus in the direction of taking out the coating apparatus. Even space is required. Further, even in a coating apparatus that is relatively small and can be taken out and attached by a human hand, it takes a relatively long time to perform the work relating to the taking out and attachment.

So far, as disclosed in Patent Document 1, a method for preventing the floor surface of the clean booth from being stained with paint and reducing the load and working time of the floor cleaning work has been described. No method has been proposed for maintaining the apparatus itself without significantly reducing the cleanliness in the clean booth and reducing the time required for maintenance.
JP-A-7-236844

  An object of the present invention is a continuously running sheet that allows maintenance of an internal coating apparatus in a relatively short time without significantly reducing the cleanliness of the interior and without significantly reducing the compactness. An object of the present invention is to provide a clean booth having a coating apparatus for coating a shaped object.

  As a result of repeating intensive studies and experiments to achieve the above object, the present inventors have provided a door that can be accessed from the outside of the clean booth in the empty space on the clean booth wall at the top of the coating device, and in the vicinity of the door It has been found that by providing means for moving the coating device to the end, it is possible to perform maintenance of the coating device, and to perform maintenance without taking the coating device out of the clean booth. Furthermore, the clean booth's cleanliness inside the clean booth can be maintained by considering the clean air inside the clean booth so that it does not mix dust and dust even when the door is opened. We have also found that maintenance can be performed without significant drop.

The present invention has been made based on these findings. That is, according to the present invention,
In a non-enclosed clean booth having an inlet and an outlet for continuously passing a sheet-like material traveling in a substantially horizontal direction and having a coating apparatus for coating the traveling sheet-like material inside ,
There is provided a clean booth comprising a door disposed on a wall surface and a moving means for moving the coating apparatus to the vicinity of the door.

The coating device is provided above the position where the sheet-like material travels,
Has a convex part above the coating position,
The door is provided on the convex portion;
The above-mentioned clean booth having the lifting / lowering means for moving the coating device up and down is preferable.

  It is preferable that this clean booth has a clean air supply means for supplying clean air from the upper part of the convex portion.

  It is preferable that the clean booth has an exhaust port below a position where the sheet-like object travels.

  The clean booth in which the coating apparatus has an air knife is preferable.

  According to the clean booth of the present invention, the maintenance of the coating apparatus for the sheet-like material that runs substantially in the horizontal direction can be performed without intrusion into the clean booth, and hence without reducing the cleanliness of the inside. Since it can be performed and maintenance can be performed without removing the coating apparatus outside the clean booth, the time required for maintenance can also be shortened, and further, the clean booth can be made compact. For this reason, the clean booth of the present invention is economically useful, and is also very useful in the case where the coating apparatus is introduced into an existing process with a small space.

  Hereinafter, the present invention will be described with reference to the drawings, but the present invention is not limited thereto.

  FIG. 1 is a schematic sectional side view showing an example of the clean booth of the present invention as viewed from the horizontal direction perpendicular to the sheet-like material traveling direction. As shown in this figure, this clean booth 1 has a structure in which a part of a rectangular parallelepiped is convex upward.

  The sheet-like material 4 (the material to be coated) travels substantially in the horizontal direction, and can pass through the openings of the inlet 2 and the outlet 3 respectively arranged on the opposing surfaces of the clean booth 1.

  Here, “substantially” traveling in the horizontal direction means that the thickness of the coating film is the same as in the horizontal direction when coating is performed, even when traveling in a slightly inclined direction. If it is obtained uniformly, it is meant to include such a case.

  From the viewpoint of avoiding contact with the sheet-like material 4, the size of the opening of the inlet 2 and the outlet 3 is preferably 20 mm or more wider than the size of the cross section perpendicular to the traveling direction of the sheet-like material 4. More preferably 50 mm or more, and from the viewpoint of maintaining the cleanliness in the clean booth 1, it is preferable to make each of the sheet-like materials 4 wider than the upper and lower left and right by 300 mm or less, and 100 mm or less wider than the size of the cross section perpendicular to the traveling direction. More preferably. Here, “upper and lower” means the vertical direction of the sheet-like object 4, and “left and right” means a horizontal direction perpendicular to the sheet-like object traveling direction.

  Moreover, there is no restriction | limiting in particular in the material which comprises a clean booth, For example, it can be used combining any 1 type or multiple, such as glass, resin, a metal. Examples of the metal include austenitic stainless steel, martensitic stainless steel, steel, aluminum, and copper. In the case of using a material with low conductivity, an antistatic treatment can be applied to the surface corresponding to the inside of the booth.

  There is no restriction | limiting in particular in the material of the sheet-like material 4 which is a to-be-coated object, For example, resin, a metal, etc. can be used. Examples of the metal include austenitic stainless steel, martensitic stainless steel, steel, aluminum, and copper. Moreover, what grind-processed the surface of these coating sides can also be used. In order for the sheet-like material to keep running in a horizontal state, it is preferable that the sheet-like material has high rigidity. In particular, a metal sheet is generally preferable because it has a relatively high rigidity even if it is thin. The thickness of the sheet is preferably 0.1 mm or more. Further, in order to maintain the flatness of the sheet-like material 4 in the horizontal direction, tension can be applied along the traveling direction of the sheet-like material 4.

  The coating device 5 is located at a substantially central portion of the clean booth 1 with respect to the traveling direction of the sheet-like material 4, and includes an elevating means 6 as a moving means for moving the coating device to the vicinity of the door 8, Rotating means 7 is provided. Here, the vicinity of the door means that the door can be opened and the internal coating device can be maintained from outside the clean booth. The portion where the coating device should be maintained is a straight distance from the door opening. It is preferable that the distance is within 300 mm.

  As the elevating / lowering means 6, a known mechanism capable of elevating and lowering the coating apparatus 5 can be appropriately employed. For example, a mechanism that manually lifts and lowers using screws may be used, or a mechanism that automatically lifts and lowers using an air cylinder or an electric motor is used in consideration of the weight of the coating apparatus 5 and the cleanliness inside the clean booth. You can also.

  The rotating means 7 is not necessary because maintenance items vary depending on the type of the coating apparatus 5, but is useful when it is necessary to maintain all surfaces of the coating apparatus 5. A known mechanism capable of rotating the coating apparatus can be appropriately adopted as the rotating means 7. For example, it can be rotated using bearings, sprockets, chains and electric motors.

  When the size of the coating device 5 is small with respect to the size of the clean booth and the coating device 5 can be moved in the horizontal direction in the clean booth, the moving means is a sheet-like object traveling together with the lifting and lowering means. Means for moving the coating apparatus in a horizontal direction along the direction may be provided. It is also possible to adopt means capable of simultaneously performing the elevation and the movement in the horizontal direction along the sheet-like material traveling direction.

  Here, the maintenance refers to a wiping operation of the tip (lip portion) of the coating apparatus, an adjustment operation of the lip clearance, a removal operation of foreign matters such as cullet attached to the coating apparatus, and the like.

  According to FIG. 1, the coating apparatus 5 is provided above the position where the sheet-like material travels, and a convex portion 1 a is provided above the coating position where the ceiling of the clean booth 1 is raised. That is, the side shape of the clean booth is convex in the direction from the end of the sheet-like material 4 to the center. The convex portion has a rectangular parallelepiped shape with an open bottom, and the inside is hollow, so that the coating apparatus can move inside. A door 8 for performing maintenance is provided on a side surface of the convex portion 1a on the upstream side or the downstream side of the sheet-like material 4.

  As for the shape of the convex portion 1a, a rectangular parallelepiped has a basic structure as shown in FIG. 1, but a part or all of the side surface may have a tapered shape as shown in FIGS. 2 and 3 are schematic side cross-sectional views of an example of a clean booth viewed from a horizontal direction perpendicular to the sheet-like material traveling direction, and FIGS. 4 and 5 are respectively along the sheet-like material traveling direction. It is the typical side sectional view which looked at the example of the clean booth from the direction. Moreover, in the side shape which looked at the whole clean booth from the orthogonal | vertical direction with respect to the sheet-like material running direction, it is good also as not only a convex type but L type | mold and anti-L type | mold as each shown in FIGS.

  Since the size of the convex portion 1a in the case of the rectangular parallelepiped structure is appropriately determined depending on the size of the coating device 5 and the device for moving means, the size is not generally defined, but the entire clean booth Since it is more economical to make the size compact, the size in the vertical direction is 500 to 1500 mm, and the size in the horizontal direction is 150 to 500 mm larger than the larger one of the sheet 4 or the coating device 5. The size in the width direction is preferably within 1000 mm from the viewpoint of facilitating maintenance of the coating apparatus 5 from the opening of the door 8 and simplifying the moving means of the coating apparatus 5. Here, the size in the vertical direction means the length from the ceiling surface of the clean booth other than the convex portion to the ceiling surface of the convex portion, the horizontal means the horizontal direction perpendicular to the traveling direction of the sheet-like material, and the width means the seat The horizontal direction along the traveling direction of the object.

  The door 8 has a basic shape of a quadrangle, but may have a rounded corner. Further, a plurality of doors may be provided depending on the type of coating apparatus and the maintenance part.

  When the number of doors is one and the entire surface of the coating apparatus is to be maintained, the size of the opening of the door 8 can be appropriately determined depending on the size of the coating apparatus 5 and the workability of the maintenance. From the viewpoint of suppressing a decrease in the cleanliness in 1, the size of the opening of the door 8 is 50 to 400 mm larger than the larger of the sizes of the coating device 5 in the vertical and width directions. The size to be widened and the size in the horizontal direction are preferably 50 to 200 mm wider than the size in the horizontal direction of the coating apparatus 5.

  As a coating method to the sheet-like material 4 performed in the clean booth 1 of the present invention, there is a low risk of damaging the sheet-like material, no recovery of the coating liquid is required, and the coating liquid is scattered. The air knife coating method is preferable from the viewpoint of few, but other general-purpose coating methods such as roll coating, die coating, and spray coating may be used. In the present invention, the coating apparatus refers to an apparatus in which a coating film to be obtained is coated on a sheet-like material when the sheet-like material passes through the lower part of the device, and in an air knife coating method Indicates an air knife, a roll in the case of roll coating, a die in the case of die coating, and a spray nozzle in the case of spray coating. For the coating device, the shape of the various coating devices is regarded as the smallest rectangular parallelepiped in which the coating device is included. In this case, the vertical refers to the vertical direction, and the horizontal refers to the sheet-like material traveling direction. The width is the horizontal direction along the running direction of the sheet. Here, in the case where several spray nozzles are arranged on a straight line in the horizontal direction perpendicular to the traveling direction of the sheet-like material, such as spray coating, the shape of the coating apparatus is the smallest that covers all the spray nozzles. Consider a rectangular parallelepiped, and specify the width and width. In addition, the size of the door 8 in the case of maintaining only a part of the coating apparatus, such as maintaining only the tip of the lip if it is an air knife or die, is not defined by the size of the vertical and horizontal width of the coating apparatus, for example, The size is determined appropriately from a size that can be put into a hand (a size that allows maintenance) to a maximum size that keeps the cleanliness in the clean booth 1 good.

  The position of the door 8 can be appropriately selected on the clean booth wall so that the effect of the present invention can be obtained. When the sheet-like material travels substantially horizontally, it is preferable to dispose it above the coating device 5 from the viewpoint of suppressing the complexity of the moving means. Further, from the viewpoint of suppressing the complexity of the moving means, it is preferable that the position is closer to the position of the coating device 5 when coating. Although the coating apparatus is moved from the position at the time of coating to the vicinity of the door during maintenance, the moving distance is preferably within 2 m. Further, the installation positions of the door 8 and the high performance filter 9 described later are appropriately determined in consideration of the cleanliness in the clean booth 1 not being lowered.

  As a method for fixing the door 8, a known method capable of fixing the door to the clean booth can be appropriately employed. From the standpoint of maintaining the cleanliness of the interior, the door can be fixed airtight, and from the standpoint of ease of maintenance, the door can be easily opened and closed. For example, it is fixed to the main body of the clean booth 1 with bolts and attached to a hinge to facilitate opening and closing, and in order to ensure confidentiality between the door and the clean booth main body, for example, a Teflon soft seal is provided on the inner surface of the door 8 Is convenient and preferable. In addition, if it is a small door, it can also be fixed with a clamp.

  There is no restriction | limiting in particular in the material of the door 8, Like glass, resin, a metal etc., it can be used combining any 1 type or multiple, like the material which comprises a clean booth. Examples of the metal include austenitic stainless steel, martensitic stainless steel, steel, aluminum, and copper. In the case of using a material with low conductivity, an antistatic treatment can be applied to the surface corresponding to the inside of the booth.

  As an effect of having the convex portion above the coating device 5 described above and having the door 8 on the convex portion, the cleanliness of the coating portion is usually set on the ceiling surface above the coating device 5. Since the means for supplying clean air is installed for the purpose of raising, the installation place of the door for maintenance is separated from the coating apparatus 5, and the moving means becomes complicated. However, by having a convex portion above the coating apparatus 5, it is possible to create a space where the door 8 for maintenance without removing the coating apparatus 5 can be installed in the vicinity of the coating apparatus 5, and the door Complicating the moving means can be suppressed by having 8 on the convex portion.

  It is preferable that a high performance filter 9 is installed on the ceiling surface of the convex portion 1 a and clean air is supplied to the clean booth 1. The high performance filter refers to a filter capable of collecting 99.97% or more of particles having a diameter of 3 μm. As a high-performance filter, a known filter that can obtain a desired cleanliness can be appropriately selected and used. For example, a HEPA filter (High Efficiency Particle Air Filter), a ULPA filter (Ultra Low Penetration Air Filter), and FFU can be used. (Fan Filter Unit) or the like can be used. If the clean air volume from the ceiling surface of the convex portion 1a alone does not reach the specified level, a high performance filter 9 is also installed on the ceiling of the other part of the clean booth 1. May be. In addition, the broken line arrow in a figure represents the flow direction of air.

  The clean air supply means for supplying clean air from the upper part of the convex portion can be formed by the high performance filter and an air supply means for sending air to the high performance filter. The air supply means can be formed of, for example, a duct and a fan that take in air from the atmosphere and send it to the high-performance filter.

The air volume of clean air supplied from a high-performance filter varies depending on the required cleanliness in the clean booth, but there is an empirical relationship between cleanliness and ventilation frequency. When a cleanliness of about 1000 / ft ³ (about 35000 / m ³ ) is required in Std.209E), it is preferable to set the air volume to 100 to 600 times. Here, the number of ventilations indicates how many times the clean booth can be ventilated per hour. Necessary air volume [m ³ / min] = Clean booth capacity [m ³ ] × Ventilation frequency [times / h] ÷ It is obtained by 60 [min / h]. Further, the number of ventilations based on the rule of thumb is not necessarily limited because it can vary depending on the shape of the clean booth and the supply method of clean air.

  A high performance filter 9 is installed on the ceiling surface of the convex portion 1a, and clean air is supplied into the clean booth through this, and the clean air flows along the inner surface of the door, so that even when the door 8 is opened, Clean air can act as an air curtain, preventing dust and dust from entering. In addition, if the entire ceiling surface of the clean booth is flat and has a considerable height, clean air will diffuse in the clean booth even if a high performance filter is installed above the coating device and clean air is supplied. Therefore, in order to increase the cleanliness of the coating part, the air volume of clean air must be increased. However, as in the present invention, in the convex clean booth, the coating device 5 is provided below the convex part 1a. Is installed, the entire air volume of clean air supplied through the high-performance filter 9 is supplied to the coating part, so that the cleanliness of the coating part is efficiently increased and the dust on the product is increased.・ Prevents dust contamination.

  The clean air supplied to the clean booth 1 flows on the surface of the sheet-like material 4, and the sheet-like material 4 is exhausted from the inlet 2 and the outlet 3 that pass through the clean booth 1. Moreover, you may provide an exhaust port below the horizontal surface where the sheet-like article 4 drive | works. For example, a plate 10 capable of passing air such as a perforated plate or a grating is provided across the entire horizontal direction of the clean booth 1 below the horizontal plane on which the sheet-like material travels, and the bottom or side surface of the bottom space 11 below the plate 10 is provided. One or both can be provided with an exhaust port 12. With this configuration, clean air passes through the gap between the sheet-like material 4 and the clean booth side surface 1b (see FIG. 8), enters the bottom space 11 through the plate 10, and is exhausted from the exhaust port 12. Can do.

  When providing the exhaust port, although not shown, it is also possible to circulate and use clean air by connecting the exhaust port 12 and the high performance filter 9 with a duct and providing a fan in the connected duct path. When circulating, the air supplied to the high-performance filter 9 is cleaner than in the case of one-pass, so the rate at which foreign matter is collected by the high-performance filter 9 decreases, and the differential pressure is less likely to increase. Therefore, there is a merit that the replacement cycle of the high-performance filter 9 becomes long.

  Here, the gap between the sheet-like material 4 and the clean booth side surface 1b is preferably 300 mm or less because it is more economical to make the size of the entire clean booth compact.

  The above-described clean booth of the present invention makes it possible to maintain the coating apparatus without significantly reducing the cleanliness in the clean booth 1, and there is no need to take out the coating apparatus outside the clean booth. Therefore, the time required for maintenance can be reduced.

  EXAMPLES Hereinafter, although an Example demonstrates this invention in more detail, these do not limit this invention.

<Example 1>
8 to 10 show the clean booth used in this example. 8 is a plan view, FIG. 9 is a vertical sectional view of the sheet-like material traveling direction as seen from the direction of arrow A in FIG. 8, and FIG. 10 is a side view as seen from the direction of arrow B in FIG. However, the side plate 1c was installed for use in Comparative Example 1 to be described later, and was kept closed throughout this example. The size of the side plate 1c is indicated by a horizontal width q and a vertical height r at the time of installation, and is as follows.

The dimensions shown in the figure are a = 3000 mm, b = 1100 mm, c = 700 mm, d = 600 mm, e = 600 mm, f = 150 mm, g = 200 mm, h = 250 mm, i = 100 mm, j = 150 mm, k = 800 mm. L = 100 mm, m = 100 mm, n = 100 mm, o = 900 mm, p = 400 mm, q = 500 mm, r = 750 mm, and the clean booth capacity is about 2.5 m ³ . For convenience of explanation, the drawings do not necessarily show the exact dimensions.

  The clean booth was installed in a device 14 (total length 6 m, circumference length 15 m) provided with an endless belt shown in FIG. The coating part coated in the clean booth is cured by the UV irradiation device 15 installed on the downstream side of the clean booth, and peeled off from the endless belt at the pulley 16 portion.

The sheet-like material 4 was an endless belt that had been mirror-polished, and an austenitic stainless steel plate having a belt width of 700 mm and a thickness of 0.15 mm was used, and a tension of 3.0 × 10 ⁷ Pa was applied by hydraulic pressure. As a coating device, an air knife 5 having a length of 75 mm, a width of 780 mm, and a width of 40 mm is installed in the center of the clean booth, the clearance between the sheet-like material 4 and the air knife 5 is 5 mm, and the air knife angle is traveled by the sheet-like material 4. With respect to the direction, it was arranged so as to be inclined 5 ° upstream from the vertically downward direction. The high-performance filter 9 has a HEPA filter (trade name: absolute filter (HEPA filter), Kondo Kogyo Co., Ltd.) whose outer dimensions are 292 mm long × 915 mm wide × 610 mm wide (clean air ejection area = 895 mm wide × 590 mm wide) An opening having a width of 895 mm and a width of 590 mm was provided on the top plate of the convex portion 1a, and a HEPA filter was connected to the top plate by a bolt and nut. Moreover, the plate 10 arranged at the lower part of the sheet-like material 4 was an austenitic stainless steel plate and used a perforated plate having a diameter of 8 mm, a pitch of 10 mm, an arrangement of 60 ° plover type, and an aperture ratio of 57%.

  In addition, most of the ceiling surface of the clean booth is made of a transparent acrylic plate that is anti-static so that the situation inside the clean booth can be seen. In addition, the maintenance door 8 arranged on the side of the rectangular parallelepiped convex portion 1a on the upstream side of the sheet-like material 4 can be opened and closed with a hinge, and when closed, it is fastened to the clean booth body with bolts. And can be sealed. The seal between the door and the clean booth body is dragonfly no. A 9096 fluororesin universal gasket 6 mm (trade name: NICHIAS SOFT SEAL, manufactured by NICHIAS) was used.

  The elevating means 6 uses a metric screw (M20, made of SUS304) so that the coating device 5 is manually raised and lowered, and the rotating means 7 is a clean environment bearing (trade name: Ultra Clean Bearing, manufactured by NTN Corporation). ), And when rotating, it was rotated manually. The coating liquid supply port 13 uses one circular hollow pipe (manufactured by SUS304) and is arranged in the center of a sheet-like material having a width of 700 mm on the upstream side 600 mm of the air knife 5, and the clearance between the liquid outlet and the sheet-like material is It was 10 mm. The coating solution was supplied by air pressure.

Using the clean booth described above, 20 parts of trimethylolpropane triacrylate (manufactured by Toagosei Co., Ltd., trade name: Aronix M309), urethane acrylate having a weight average molecular weight of about 1146 (manufactured by Shin-Nakamura Chemical Co., Ltd., trade name) : NK Oligo U-6HA) 30 parts, 1,6-hexanediol diacrylate (manufactured by Osaka Organic Chemical Co., Ltd., trade name: Biscote # 230) mixed as a coating solution, 4 running speed 3 m / min, air knife 5 slit clearance 0.1 mm, high-speed air flow 0.8 m ³ / min blown from the air knife slit, clean air flow 20 m ³ / min blown from the high-performance filter 9 ( The coating was carried out continuously for 10 hours under the condition of the number of ventilations = about 480 times / h). Here, “parts” indicates parts by mass.

The cleanliness during coating for 10 hours was measured in the vicinity of 100 mm in the upper center of the air knife 5 using an air particle counter (Rion Co., Ltd., trade name: Particle Counters KR-12A). Std. 209E), about 800 / ft ³ (about 28000 / m ³ ).

  After 10 hours of continuous coating, the high-speed air blown from the air knife 5 is stopped, the clean air from the high-performance filter 9 is blown off, the door 8 is opened, and the coating liquid adhered to the lip portion of the air knife 5 We decided to perform maintenance work such as wiping off and adjusting the lip clearance.

  The air knife 5 is moved to the door 8 by the elevating means 6 (movement distance: 0.45 m), and the lip portion of the air knife 5 is rotated by the rotating means 7 so as to face the door 8 (rotation angle: 85 °). The linear distance from the opening to the lip of the air knife 5 was 0.2 m, and maintenance work was performed.

Thereafter, the air knife 5 was restored to the above position, and when the door 8 was closed and the cleanliness of the air knife 5 near the center upper part 100 mm was measured, it was about 8000 / ft ³ (about 280000 / m ³ ). Further, about 10 minutes after the door 8 was closed, the cleanliness of the air knife 5 near the central upper portion of 100 mm returned to 800 / ft ³ (about 28000 / m ³ ).

  The time required for the maintenance work was 15 minutes in total, and 10 minutes for the cleanliness to return to the original level was added, and the downtime was about 25 minutes.

<Comparative Example 1>
A clean booth similar to that in Example 1 was used. However, the side plate 1c beside the air knife on the side 1b of the clean booth has a structure that can be attached and detached with bolts, and the material is an austenitic stainless steel plate.

  Continuous coating was performed for 10 hours under the same conditions as in Example 1. After the coating was completed, the side plate 1c beside the air knife was removed, and the air knife 5 was taken out of the clean booth 1 to perform maintenance work. The door 8 was kept closed throughout.

Thereafter, when the air knife 5 is restored to the original position, and the air knife side plate 1c is closed and the cleanliness of the air knife 5 near the central upper portion 100 mm is measured, it is about 230000 pieces / ft ³ (about 8100000 pieces / m ³ ). there were. Further, after the air knife side plate 1c was closed, it took 30 minutes for the cleanliness of the air knife 5 near the central upper portion of 100 mm to return to 800 / ft ³ (about 28000 / m ³ ).

  The time required for the maintenance work was 1.5 hours in total, and it took 30 minutes for the cleanliness to return to its original state, and a total of 2 hours of downtime was required before the next coating.

It is the typical sectional side view seen from the horizontal direction perpendicular | vertical to the sheet-like material traveling direction which shows an example of the clean booth of this invention. It is the typical sectional side view seen from the horizontal direction perpendicular | vertical to the sheet-like material traveling direction which shows another example of the clean booth of this invention. It is the typical sectional side view seen from the horizontal direction perpendicular | vertical to the sheet-like material traveling direction which shows another example of the clean booth of this invention. It is the typical sectional side view seen from the direction along the sheet-like material traveling direction which shows another example of the clean booth of this invention. It is the typical sectional side view seen from the direction along the sheet-like material traveling direction which shows another example of the clean booth of this invention. It is the typical sectional side view seen from the horizontal direction perpendicular | vertical to the sheet-like material traveling direction which shows another example of the clean booth of this invention. It is the typical sectional side view seen from the horizontal direction perpendicular | vertical to the sheet-like material traveling direction which shows another example of the clean booth of this invention. 3 is a schematic plan view of a clean booth used in Example 1. FIG. It is the typical sectional side view which looked at the clean booth used in Example 1 from the arrow A direction of FIG. It is the typical side view which looked at the clean booth used in Example 1 from the arrow B direction of FIG. Typical sectional view seen from the horizontal direction perpendicular to the belt running direction of the apparatus provided with the endless belt provided with the clean booth used in Example 1

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Clean booth 1a Clean booth convex part 1b Clean booth side surface 1c Clean booth side plate next to air knife 2 Inlet of sheet-like material passing through clean booth 3 Outlet of sheet-like material passing through clean booth 4 Sheet-like material 5 Coating device 6 Lifting means 7 Rotating means 8 Door 9 High performance filter 10 Ventilation plate 11 Bottom space 12 Exhaust port 13 Coating liquid supply port 14 Device with endless belt 15 UV irradiation device 16 Pulley

Claims (5)

In a non-enclosed clean booth having an inlet and an outlet for continuously passing a sheet-like material traveling in a substantially horizontal direction and having a coating apparatus for coating the traveling sheet-like material inside ,
A clean booth comprising a door disposed on a wall surface and a moving means for moving the coating apparatus to the vicinity of the door. The coating device is provided above the position where the sheet-like material travels,
Has a convex part above the coating position,
The door is provided on the convex portion;
The clean booth according to claim 1, wherein the moving means has lifting means for lifting and lowering the coating apparatus.   The clean booth according to claim 2, further comprising clean air supply means for supplying clean air from an upper portion of the convex portion.   The clean booth according to claim 3, wherein the clean booth has an exhaust port below a position where the sheet-like object travels.   The clean booth according to any one of claims 1 to 4, wherein the coating apparatus has an air knife.

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