JP2010094618A - Nozzle apparatus for washing film - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a film washing apparatus for continuously removing even extremely fine dust with several μm, film segments, and stains adhering to the surface of a plastic film. <P>SOLUTION: The nozzle apparatus for washing film includes one or two flat members 53 and a washing liquid discharge port 52 formed in the flat member 53 and for blowing a washing liquid to at least one face of the front and rear faces of a film 12 moving in parallel to the flat member 53. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a film cleaning nozzle device that continuously cleans dust, film pieces, and dirt adhering to the surface of a plastic film. In particular, the FPD (flat panel display) field where a clean one is required, The present invention relates to a film cleaning nozzle device in the fields of electronics and optics.

  Plastic films are used in various fields such as FPD field, electronics field, and optical field. Plastic films used in the FDP field and 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 defects such as dust, fibers, film flaws, etc., and defects such as contamination and adhesion to the product, as well as physical damage such as scratches and imprints. The occurrence of defects is strictly controlled. Market requirements for the frequency of these defects are rapidly becoming stricter. In addition, with respect to the degree of defects, very fine defects that have not been considered as a problem in the past have become unacceptable, and there is a need for improvement.

  In order to solve such problems, in recent years, efforts have been made to remove dust by washing plastic films.

  Patent Document 1 proposes a cleaning nozzle that is provided with an ultrasonic generation nozzle and removes dust on the film by an air current blown from the ultrasonic generation nozzle and vibration by the ultrasonic wave.

In Patent Document 2, cleaning liquid is continuously sprayed from a cleaning nozzle as a cleaning means, and the cleaning liquid dropped as a cleaning liquid recirculation means is recirculated, and the drying means continuously cleans the optical plastic film sprayed with warm air.・ A drying method has been proposed.
Japanese Patent Laid-Open No. 11-239761 JP 2002-292347 A

  However, in Patent Document 1, a plasticizer is contained in an optical plastic film, and when it is washed with alcohol, the plasticizer is eluted, which causes a problem of a change in film characteristics and a decrease in uniformity.

  Moreover, in patent document 2, there exists a problem that the dust boundary which peeled with the air sprayed may scatter to the vicinity, and may adhere to a film again, or it cannot fully remove about what adhered firmly.

  Even when the film is washed as in Patent Document 1 or Patent Document 2, there is a problem that very fine foreign matters of several μm on the film have strong adhesion to the film and cannot be removed preferably. It was.

  The present invention has been made in view of such circumstances, and is a film cleaning nozzle capable of continuously removing even very fine dust, film pieces, and dirt of several μm attached to the surface of a plastic film. An object is to provide an apparatus.

  In order to achieve the above object, the present invention provides a cleaning liquid to one or two flat members and at least one surface side of the front and back surfaces of the film formed on the flat member and running parallel to the flat member. There is provided a film cleaning nozzle device comprising a cleaning liquid discharge port for spraying. When there are two flat members, it is preferable to provide a pair or more of the cleaning liquid discharge ports facing the front and back of the film.

  The flat member preferably includes a cleaning liquid recovery port for recovering the cleaning liquid sprayed on the film. When there are two flat members, it is preferable that a pair of the cleaning liquid recovery ports be provided so as to face the front and back of the film.

  Moreover, it is preferable that the clearance gap between a flat member and a film is 0.25 mm or less.

  The film cleaning nozzle device thus configured can continuously remove even very fine dust, film pieces, and dirt of several μm attached to the surface of the plastic film.

  That is, at least one of the front and back surfaces of the film having a large speed gradient in the gap between the flat member and the film by cleaning the film with a cleaning nozzle device having a flat member and a cleaning liquid discharge port for supplying a cleaning liquid to the film. A very fine dust of several μm, film pieces, and dirt can be removed from the film by the water flow along the surface.

  In particular, by setting a gap of 0.25 mm or less consisting of a flat member and a film, the cleaning liquid supplied from the supply port has a large speed gradient in a narrow gap of 0.25 mm or less. In addition, fine dust, film pieces and dirt can be removed from the film.

  Here, the film cleaning nozzle device having only one flat member is applied when only one side of the film is to be cleaned.

  In addition, the film cleaning nozzle device is preferably provided with a pressure reducing mechanism for reducing the pressure of spraying the cleaning liquid onto the film.

  ADVANTAGE OF THE INVENTION According to this invention, the washing nozzle apparatus of the film which can remove continuously the very fine dust of several micrometers adhering to the surface of a plastic film, a film piece, and dirt can be provided.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

  FIG. 1 is a schematic side view showing an overall configuration when the film cleaning nozzle device of the present invention is incorporated in a film coating apparatus.

  As shown in FIG. 1, the film coating apparatus 40 of this embodiment includes a plastic film roll unwinding section 42, a film cleaning nozzle apparatus 36 of the present invention, a drying section 38, a coating section 44, a drying section ( A drying section 46 after coating and a winding section 48 are provided in this order. The sheet-like plastic film 12 sequentially unwound from the unwinding portion 42 of the plastic film roll is conveyed to the film cleaning system 10 of the present invention by the conveying rollers 14 and 16.

  The film coating apparatus 40 in FIG. 1 includes cleaning nozzle devices 36 and 36 that perform cleaning on a traveling film using a cleaning liquid, and a drying unit 38 that performs drying of the cleaned film. Here, an example is shown in which the cleaning nozzle 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 cleaning nozzle device 36 has three stages and the drying unit 38 has two stages. good. In addition, it is preferable that an entire cover 50 that covers the entire cleaning nozzle device 36 and the drying unit 38 is provided.

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

  The cleaning nozzle device 36 according to the present invention has a structure in which the cleaning liquid is supplied to at least one surface side of the front and back surfaces of the film while the film is running, thereby cleaning with a water flow along at least one surface. . The cleaning liquid is constantly supplied.

  FIG. 2 shows an embodiment of the cleaning nozzle device 36 according to the present invention, FIG. 2 (a) is a perspective view, and FIG. 2 (b) shows a part of a cross section viewed from the side. FIG. The cleaning nozzle device 36 in FIG. 2 is for cleaning one side of the film.

  The cleaning nozzle device 36 shown in FIG. 2 includes a single flat member 53 and a cleaning liquid discharge port 52 provided in the flat member 53 that supplies the cleaning liquid perpendicularly to one side of the film. The gap 54 between the flat member and the film preferably has a width D of 0.25 mm or less.

  Thus, by cleaning the film 12 with the cleaning nozzle device 36 having the flat member 53 and the cleaning liquid discharge port 52 for supplying the cleaning liquid to the film 12, a large speed is obtained in the gap between the flat member 53 and the film 12. Very fine dust, film pieces, and dirt of several μm can be removed from the film by a water flow along the surface of the film having a gradient.

  In particular, when the gap 54 between the flat member 53 and the film 12 has a width D of 0.25 mm or less, the flow rate of the cleaning liquid has a large speed gradient in a narrow gap of 0.25 mm or less. A parallel flow parallel to the film surface and having a high flow velocity is generated between the flat member 53. As a result, even very fine dust, film pieces, and dirt of several μm can be removed from the film.

  According to the cleaning nozzle device of the present invention, the horizontal force represented by the following formula (Togashi et al., Japan Society of Mechanical Engineers) acts on the adhered foreign matter due to the water flow parallel to the film, thereby removing dust. It is possible to effectively remove dust while suppressing damage to the film.

  Here, Fdet is the force acting on the dust, d is the diameter of the dust, u is the velocity of the water flow, η is the viscosity coefficient of water, and c is the correction coefficient.

  In the present invention, as shown in FIG. 3, the cleaning liquid discharge port 52 of the cleaning nozzle device 36 is supplied with a supply port 52a for supplying the cleaning liquid, a throttle 52b for reducing the pressure of the cleaning liquid supplied from the supply port 52a, It is preferable to comprise the blower outlet 52c which blows out the pressure-reduced washing | cleaning liquid to the washing | cleaning side of a film.

  FIG. 3 is a diagram in the case where a plurality of perforations are used for the aperture 52b, and since the length in the film longitudinal direction can be shortened, the cleaning nozzle is provided when a plurality of cleaning liquid outlets described later are provided. It is effective to make the device compact.

  FIG. 4 shows the relationship between the simple model of the cleaning nozzle device of FIG. 3 and the cleaning liquid pressure distribution. In addition, the film is conveyed in a state where an appropriate tension is applied by rollers on the upstream side and the downstream side. Assuming that the pressure of the cleaning liquid supplied to the supply port 52a of the cleaning nozzle device 36 is Ps, the cleaning liquid passes through the throttle 52b and becomes the pressure Pi at the outlet 52c, and is discharged and becomes the pressure Po after cleaning the film. Due to this pressure, a force (the area of the triangle Pi in FIG. 4) for pulling the film 12 away from the cleaning nozzle device 36 is generated.

  Here, when the film 12 approaches the cleaning nozzle device 36, the flow path resistance between the film 12 and the cleaning nozzle device 36 increases and the discharge port pressure Pi increases to Pi + ΔPi, so that the film 12 is pulled away from the cleaning nozzle device 36. Force increases to the triangle Pi + ΔPi. Similarly, when the film 12 is separated from the cleaning nozzle device 36, the force for separating the film 12 from the cleaning nozzle device 36 is reduced, and the distance between the cleaning nozzle device 36 and the film 12 can be automatically maintained.

  FIG. 5 (a) shows another embodiment of the cleaning nozzle device 36 according to the present invention, and is a view when the diaphragm 52b of FIG. 3 has a narrow gap structure. As shown in FIG. 5 (b), it is formed by a plurality of plate structures 53a, 53b,... 53e, and can be easily manufactured.

  As shown in FIGS. 3 and 5, the pressure of the cleaning liquid supplied to the outlet 52 c is set at the distance between the flat member 53 and the film 12 by providing a pressure reducing mechanism (throttle) that reduces the pressure of spraying the cleaning liquid onto the film. Accordingly, the distance between the flat member 53 and the film 12 is kept constant.

  FIG. 6 shows another embodiment of the cleaning nozzle device 36 according to the present invention.

  The cleaning nozzle device 36 shown in FIG. 6 includes two flat members 53 and 53, and cleaning liquid discharge ports 52 and 52 provided in the flat members 53 and 53 that supply the cleaning liquid perpendicularly to the front and back surfaces of the film. Consists of. The two flat members 53 and 53 preferably form narrow gaps 54 and 54 in which the gap D between the flat member and the film is 0.25 mm or less, respectively.

  By flowing the cleaning liquid through such a narrow gap 54, the flow rate of the cleaning liquid has a large speed gradient, so that the film surface is parallel to the film surface between the front and back surfaces of the film and the two flat members 53, 53. A parallel flow with a high flow velocity is generated. As a result, even very fine dust, film pieces, and dirt of several μm can be removed from the film.

  FIG. 7A shows another embodiment of the cleaning nozzle device 36 according to the present invention, in which a plurality of cleaning liquid discharge ports 52 of FIG. 6 are provided on the front and back surfaces of the film, respectively. . In addition, since a large number of cleaning liquid discharge ports 52 are provided, a cleaning liquid recovery port 56 for discharging the cleaning liquid from the narrow gap is provided between the cleaning liquid discharge ports 52 and 52 in order to prevent the cleaning liquid from staying in the narrow gap. ing. By using the cleaning nozzle device 36 shown in FIG. 7A, the cleaning nozzle device shown in FIG. 5 can be cleaned a plurality of stages, so that fine foreign matters on the film can be further removed.

  Further, as shown in FIG. 7B, the position of the cleaning liquid discharge port 52 may be shifted on the front and back surfaces of the film. By shifting the positions of the cleaning liquid discharge port 52 and the cleaning liquid recovery port 56 opposed to each other, the film is slightly displaced when the film passes through the cleaning nozzle device. The cleaning effect can be enhanced by the minute displacement of the film.

  As described above, the film 12 cleaned by the film cleaning nozzle device 36 of the present invention is sent to the drying section 38 by the rollers 24 and 26.

  In addition, it is preferable to provide the air nozzle which removes the washing | cleaning liquid adhering to a film, and the static elimination mechanism which ionizes the air supplied to the blower blow of an air knife in the back | latter stage of the washing nozzle apparatus 36. FIG.

  The film 12 that has been washed and dried is coated with a coating solution at the coating unit 44, passes through the drying unit 46 while being transported by a roller, and is wound into a roll state at the winding unit 48.

  The plastic film used in the present invention is not particularly limited as long as it is a transparent sheet or film. For example, a polyester film, a polyethylene film, a polypropylene film, a cellophane film, a diacetyl cellulose film, a triacetyl cellulose film. , Acetylcellulose butyrate film, polyvinyl chloride film, polyvinylidene chloride film, polyvinyl alcohol film, ethylene vinyl alcohol film, polystyrene film, polycarbonate film, polymethylpenter film, polysulfone film, polyether ketone film, polyether sulfone film , Polyetherimide film, polyimide film, fluororesin film, nylon fill , Polycycloolefin films, thermoplastic resin film such as an acrylic film, and at least one surface of these plastic films, coating, coating, bonding, may be mentioned multi-layer film subjected to processing such as printing. When using a triacetyl cellulose film, polyester film, polycycloolefin film, or polycarbonate film that requires high transmittance and high film uniformity, it is easy to identify defects caused by dust, etc. .

  The thickness of the plastic film used for this invention can be arbitrarily selected from the range of 5-2000 micrometers, Preferably it is 15-500 micrometers, Most preferably, it is 20-200 micrometers.

  The film cleaning nozzle device of the present invention has been described with reference to the drawings. However, the present invention is not limited to the configurations described in the above drawings, and the gist of the present invention includes, for example, appropriately combining the configurations described in the respective drawings. The configuration can be changed as appropriate without departing from the scope of the invention.

The figure which shows the coating device of the film incorporating the cleaning nozzle apparatus of the film of this invention The figure which shows embodiment of the washing nozzle apparatus which concerns on this invention The figure which shows other embodiment of the washing | cleaning liquid discharge port of the washing | cleaning nozzle apparatus which concerns on this invention. The figure which showed the relationship between the simple model of the washing | cleaning nozzle apparatus which concerns on this invention, and washing liquid pressure distribution The figure which shows other embodiment of the aperture_diaphragm | restriction of the washing nozzle apparatus which concerns on this invention. The figure which shows other embodiment of the washing nozzle apparatus which concerns on this invention The figure which shows other embodiment of the washing nozzle apparatus which concerns on this invention

Explanation of symbols

  DESCRIPTION OF SYMBOLS 12 ... Film, 36 ... Cleaning nozzle apparatus, 38 ... Drying part, 40 ... Film coating apparatus, 42 ... Unwinding part, 48 ... Winding part, 50 ... Whole cover, 52 ... Cleaning liquid discharge port, 52a ... Supply port, 52b ... throttle, 53c ... outlet, 53 ... flat member, 54 ... gap, 56 ... cleaning liquid recovery port, D ... width of gap between flat member and film

Claims (6)

One or two flat members;
A cleaning nozzle device for a film, comprising: a cleaning liquid discharge port that sprays a cleaning liquid on at least one of the front and back surfaces of the film that is formed on the flat member and runs parallel to the flat member. When there are two flat members,
The film cleaning nozzle device according to claim 1, wherein a pair of the cleaning liquid discharge ports are provided to face the front and back of the film.   3. The film cleaning nozzle device according to claim 1, wherein the flat member includes a cleaning liquid recovery port that recovers the cleaning liquid sprayed on the film. When there are two flat members,
The film cleaning nozzle device according to claim 3, wherein a pair of the cleaning liquid recovery ports are provided to face the front and back of the film.   The film cleaning nozzle device according to any one of claims 1 to 4, wherein a gap between the flat member and the film is 0.25 mm or less. In the film cleaning nozzle device,
6. The film cleaning nozzle device according to claim 1, further comprising a pressure reducing mechanism for reducing a pressure of spraying the cleaning liquid onto the film.

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