JP2012055854A - Film washing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a film washing device capable of effectively removing fine foreign matters (dust) by the stream of a washing water.SOLUTION: The film washing device includes: one or two supply members; and a washing liquid-discharging port which is formed on the supply member and through which the washing liquid is blown on at least one of both sides of a film moving in parallel to the supply member. The washing liquid-discharging ports are composed so as to form the flow of the washing liquid in multiple directions on the moving film, and are preferably composed in a V shape.

Description

  The present invention relates to a film cleaning apparatus for cleaning dust and dirt attached to the surface of a film or the like with a liquid.

  Plastic films are used in various fields such as FPD (Flat Panel Display), electronics, and optical fields. Plastic films used in the FPD field and the electronics field are used as members and process materials through processes such as film formation, coating, and bonding. The manufacturing process must be handled in a clean environment from beginning to end, and foreign substances such as dust, fibers, and film flaws can enter and adhere to the product, and physical defects such as scratches and imprints can be generated. Are strictly controlled. And market requirements for the occurrence of these defects are rapidly becoming stricter. In addition, with respect to the degree of defects, very fine defects that have not been regarded as problems in the past are no longer tolerated, and improvements are required.

  In order to solve such problems, in recent years, efforts have been made to remove dust by washing plastic films. As a cleaning means, dust on the film is removed by a velocity gradient of the water flow along the film.

  In Patent Document 1, a cleaning nozzle device provided with a supply member and a cleaning liquid discharge port for supplying a cleaning liquid to the film is used to clean the film while running, thereby providing a large speed gradient in the gap between the supply member and the film. A configuration is shown in which very fine dust, film pieces, and dirt of several μm are removed from the film by a water flow along the surface of the film having the following. The cleaning liquid that is supplied from the cleaning liquid discharge port and forms a water flow parallel to the film acts on the foreign matter with the horizontal force expressed by the following formula (Togashi et al., Japan Society of Mechanical Engineers) to remove the foreign matter, and to the film Foreign matter can be effectively removed while suppressing damage. The acting force on the foreign matter from the above formula is proportional to the square of the diameter d of the foreign matter.

Fdet: force acting on foreign matter, d: diameter of foreign matter, u: velocity of water flow, η: viscosity coefficient of water, c: correction factor

JP 2010-94618 A

  However, in Patent Document 1, the water flow of the cleaning liquid is only one direction parallel to the traveling direction of the film (the front-rear direction of the film traveling is one direction). However, depending on the direction in which foreign matter is attached and the direction of the water flow, There are cases where the acting force becomes small and effective removal cannot be performed.

  As shown in FIG. 1, it is assumed that a fine foreign matter (dust) 2 of several μm to be cleaned is attached on the film in various directions. The foreign substances 2a, 2b and 2d are the same rectangle composed of the long side of the length L1 and the short side of the length L2, and the attachment directions are different. 2c has a spherical shape with a diameter L3. The foreign matter 2a is attached so that the long side is orthogonal to the traveling direction of the film, and the foreign matter 2b is attached so that the short side is orthogonal to the traveling direction of the film. The foreign matter 2d is attached such that the long side obliquely intersects the traveling direction of the film.

  If the direction of the water flow of the cleaning liquid is one direction of the arrow e, the foreign matter 2a receives the largest acting force because the water flow acts at right angles to the long sides, and the foreign matter 2b acts most at right angles to the short sides. Receives a small acting force. The foreign matter 2d receives a medium acting force because the water flow acts obliquely on the long side and the short side.

  If the adhesion forces of the foreign substances 2a, 2b and 2d are the same, the foreign substance 2a is easily removed with a large acting force, but the foreign substance 2b may not be removed because the acting force is small. As described above, there is a problem that foreign matters cannot be effectively removed by a water flow in only one direction.

  In view of the above-described conventional drawbacks, the present invention provides a film cleaning apparatus that effectively removes foreign matter with cleaning water.

In order to solve the above-described problems, the present invention provides one or two supply members, and a cleaning liquid discharge port formed in the supply member, and at least one surface of the front and back surfaces of the film that runs parallel to the supply member In a film cleaning apparatus having a cleaning liquid discharge port for spraying a cleaning liquid against
The cleaning liquid discharge port is configured to form a flow of cleaning liquid in a plurality of directions along the surface of the traveling film.

  In the film cleaning apparatus described above, the cleaning liquid discharge port is formed in a V shape with respect to the traveling film.

  In the film cleaning apparatus described above, the cleaning liquid discharge port is configured such that a V-shaped apex faces a traveling direction of the film.

  In the film cleaning apparatus described above, a plurality of the cleaning liquid discharge ports are arranged in the supply member.

  In the film cleaning apparatus described above, the supply member is provided with a plurality of cleaning liquid suction ports for sucking a cleaning liquid, and the cleaning liquid discharge ports and the cleaning liquid suction ports are arranged in a staggered manner.

  According to the present invention, foreign matters can be effectively removed by forming a flow in a plurality of directions from the cleaning liquid discharge port.

It is a conceptual diagram of the foreign material adhesion to a film. The block diagram of the film coating device incorporating the Example of this invention. BRIEF DESCRIPTION OF THE DRAWINGS Structure explanatory drawing of the principal part of the film cleaning apparatus of this invention Example 1. FIG. Similarly operation | movement explanatory drawing of a film cleaning apparatus. Operation | movement explanatory drawing of the film cleaning apparatus of this invention Example 2. FIG.

  FIG. 2 is a schematic side view of a film coating apparatus incorporating an embodiment of the present invention. In FIG. 2, a plastic film roll unwinding unit 42, a film cleaning unit 36, a drying unit 38, a coating unit 44, a drying unit (drying unit after coating) 46, and a winding unit are included in the film coating apparatus 40. 48 are arranged in order. The sheet-like plastic film 12 sequentially unwound from the unwinding section 42 is conveyed to the film cleaning system 10 via the conveying rollers 14 and 16.

  The film coating apparatus 40 in FIG. 2 includes a film cleaning apparatus 36 that cleans the traveling film 12 and a drying unit 38 that dries the cleaned film. Here, an example is shown in which the film cleaning device 36 has two stages and the drying unit 38 has one stage. However, the present invention is not limited to this. For example, the film cleaning device 36 has three stages and the drying unit 38 has two stages. good. In addition, it is preferable that the whole cover 50 which covers the whole film cleaning apparatus 36 and the drying part 38 is provided.

  The object to be cleaned in the embodiment of the present invention is very fine dust, film pieces, and dirt of several μm attached to the surface of the plastic film.

  The film cleaning device 36 according to the embodiment of the present invention has a structure in which the film is washed and washed with a water flow along one surface by the cleaning liquid supplied to at least one surface side of the film front and back surfaces. Is constantly being supplied.

Example 1
FIG. 3 shows Example 1 of the film cleaning apparatus 36 according to the present invention. 3A is a perspective view of the main part, and FIG. 3B is a perspective view illustrating the flow of the cleaning liquid in the supply member below FIG. 3A. The film cleaning apparatus in FIG. 3 shows a configuration for cleaning both surfaces of the film 1.

  The film cleaning apparatus is configured such that the film 1 travels in parallel between two supply members 3 and 5 that are disposed apart from each other. Each of the supply members 3 and 5 is provided with a pair of cleaning liquid discharge ports 4 and 6 for spraying the cleaning liquid perpendicularly to both the front and back surfaces of the film 1. The cleaning liquid discharge ports 4 and 6 are formed in a V shape with continuous openings to the traveling film 1. The V-shaped apex 4e has a sharp shape with a predetermined angle α, but is formed so as to face the traveling direction of the film. The V-shaped apex 4e is directed in the traveling direction of the film, thereby preventing the apex 4e from being caught on the traveling film 1. Further, the openings of the V-shaped sides of the cleaning liquid discharge ports 4 and 6 are arranged to be inclined with respect to the film traveling direction. The gap between the supply members 3 and 4 and the film 1 preferably has a width of 0.25 mm or less.

  FIG. 3 shows simplified supply members 3, 5 and cleaning liquid discharge ports 4, 6 as the main parts of the film cleaning apparatus. Actually, a supply path for supplying the cleaning liquid is connected to the supply members 3 and 5, and this supply path is formed in a shape suitable for the cleaning liquid to uniformly flow out from the V-shaped opening of the cleaning liquid discharge port. . Further, the cleaning liquid blown out to the film flows out in the front-rear direction of the film along with the removed foreign matter, and an outflow path for guiding this is provided and discharged to the outside.

  In the above configuration, the cleaning liquid flows from the front surface to the back surface through the cleaning liquid discharge port 4 in the supply member 3, and flows from the back surface to the front surface through the cleaning liquid discharge port 6 in the supply member 5. The cleaning liquid is blown out to the film 1 from the openings on the two sides constituting the V shape of the cleaning liquid discharge ports 4 and 6. FIG. 3B shows the outflow situation of the cleaning liquid blown from the cleaning liquid discharge port 6 of the supply member 5. The cleaning liquid blown out from the discharge port 6 flows out along the surface of the film 1 in two directions indicated by arrows 6a, 6b and 6c, 6d perpendicular to both sides from the opening of each side constituting the V shape. After that, both water flows merge and flow in the direction of the arrow 8 in the front-rear direction along the travel of the film 1. Accordingly, water flows in three directions (arrows 6a and 6b, arrows 6c and 6d, and arrow 8) flow on the surface of the film 1.

  FIG. 4 is an explanatory diagram of both cleaning liquid discharge ports 4 and 6 and the flow of the cleaning liquid flowing out from the discharge ports. FIG. 4A is a side view showing both cleaning liquid discharge ports 4 and 6 in cross section, and FIG. In B), the cleaning liquid discharge port 4 is shown from the top in a plan view.

  In FIG. 4 (B), the cleaning liquid blown out from the discharge port 4 is the surface of the film 1 in the directions of arrows 4a to 4d perpendicular to both sides from the openings of the sides forming the V shape. Then, the two water flows merge and flow in the direction of the arrow 7 in the front-rear direction along the travel of the film 1. Accordingly, the cleaning liquid flowing out from the discharge port 4 flows along the film 1 in three directions indicated by arrows 4a to 4d and 7 (arrows 4a and 4b, arrows 4c and 4d).

  According to the water flow in the three directions from the discharge ports 4 and 6, as shown in FIG. 1, the dust attached to both surfaces of the film 1 in different directions is an opportunity that the long side is orthogonal to the water flow in the three directions. , And the chance of intersecting at near-orthogonal angles is increased and effectively eliminated.

  In addition, a plurality of pairs of the cleaning liquid discharge ports 4 and 6 may be provided, and in this case, removal of attached dust becomes more reliable.

(Example 2)
FIG. 5 shows a second embodiment of the present invention, and schematically shows the flow of the cleaning liquid discharge port, the cleaning liquid suction port, and the cleaning liquid.

  9 is a cleaning liquid discharge port, and 11 is a cleaning liquid suction port, both of which are provided in the supply members 3 and 5 in FIG. A large number of the discharge ports 9 and the suction ports 11 are arranged in a matrix, and the discharge ports 9 or the suction ports 11 are individually arranged in a staggered manner. They are staggered as a whole. The cleaning liquid flowing out from the discharge port 9 hits the film 1 and then flows along the film so as to be sucked into the suction port 11. Specifically, as shown in FIG. 5, it flows in two directions (arrows 9a and 9b, arrows 9c and 9d) indicated by arrows 9a to 9d from each discharge port 9 toward the suction port 11. In order to make the explanation easy to understand, the discharge port 9 is illustrated in a star shape and the suction port 11 is illustrated in a circular shape, but both may have the same shape or may have another shape.

  The cleaning liquid that has flowed out of the discharge port 9 and has not been sucked into the suction port 11 merges and flows in the direction indicated by the front and rear arrows 7 along the traveling direction of the film 1. Therefore, the cleaning liquid flowing out from the discharge port 9 flows along the film 1 in the three directions indicated by arrows 9 a to 9 d and 7. As shown in FIG. 1, the dust attached to the back surface of the film 1 in different directions increases the chance that the long side is caught at an angle that is orthogonal or close to the water flow in the three directions, and is effectively removed. The Further, as the film 1 advances, the discharge ports 9 and the suction ports 11 that are arranged in a staggered manner repeatedly pass through, so that the water flow direction of the cleaning liquid is repeatedly changed, and vibrational pressure is applied to the foreign matter. Foreign matter can be removed.

  As a modification of the second embodiment, all of the discharge port 9 and the suction port 11 may be configured as discharge ports in the supply members 3 and 5. In this case, the washing water blown to the film 1 from the plurality of discharge ports flows in a random direction, finally joins and flows in the direction of the arrow 7. Even in this case, as shown in FIG. 1, the dust attached to the film 1 in different directions increases the chance that the long side is captured by the water flow in a plurality of directions in the random direction and the direction of the arrow 7. Removed.

  DESCRIPTION OF SYMBOLS 1,12 ... Film, 2 (2a-2d) ... Foreign substance 3, 5 ... Supply member 4, 6, 9 ... Cleaning liquid discharge port, 4e ... V-shaped vertex, 11 ... Cleaning liquid suction port, 4a-4d, 6a to 6d, 7, 8... A flow of cleaning liquid in a plurality of directions.

Claims (5)

In a film cleaning apparatus comprising a supply member that supplies a cleaning liquid, and a cleaning liquid discharge port that sprays the cleaning liquid on at least one of the front and back surfaces of the film that is formed on the supply member and runs parallel to the supply member.
The film cleaning apparatus, wherein the cleaning liquid discharge port is configured to form a flow of cleaning liquid in a plurality of directions along a surface of a traveling film.   2. The film cleaning apparatus according to claim 1, wherein the cleaning liquid discharge port is formed in a V shape with respect to the traveling film.   3. The film cleaning apparatus according to claim 2, wherein the cleaning liquid discharge port is configured such that a V-shaped apex faces a traveling direction of the film.   The film cleaning apparatus according to claim 1, wherein a plurality of the cleaning liquid discharge ports are arranged in the supply member.   5. The film cleaning apparatus according to claim 4, wherein the supply member is provided with a plurality of cleaning liquid suction ports for sucking a cleaning liquid, and the cleaning liquid discharge ports and the cleaning liquid suction ports are arranged in a staggered manner.

Images