JPH0550420B2 - - Google Patents

Description

[Detailed description of the invention]

(Industrial Application Field) The present invention relates to a flexible support (hereinafter simply referred to as "support").
The present invention relates to a so-called support dust removal method and apparatus for removing foreign matter, dust, etc. attached to the surface of a support. In addition, the "support" referred to in the present invention generally refers to
Polyethylene terephthalate, polyethylene-2,6-naphthalate, whose width is from several cm to several meters, length is several tens of meters or more, and thickness is from several μm to several 100 μm.
Cellulose diacetate, cellulose triacetate, cellulose acetate propionate,
Plastic films such as polyvinyl chloride, polyvinylidene chloride, polycarbonate, polyimide, polyamide, etc.; paper with 2 carbon atoms such as polyethylene, polypropylene, ethylene butene copolymer, etc.
Paper coated or laminated with ~10 α-polyolefins; Metal foils such as aluminum, copper, tin, etc.;
These include flexible strips made of, etc., or strips using the strips as a base material and having a preliminary processed layer formed on the surface thereof. Further, the above-mentioned support is coated with a coating liquid depending on its use, such as a photosensitive coating liquid, a magnetic coating liquid, a surface protection coating, an antistatic coating, or a lubricity coating liquid, etc., and after drying, They are cut into desired widths and lengths, and typical products include various photographic films, photographic papers, magnetic tapes, and the like. (Prior Art) Conventionally known methods for removing dust from a support include a method in which a nonwoven fabric or blade held in an appropriate manner is pressed against the support to trap surface deposits with the nonwoven fabric or blade; There is a method of blowing high-temperature air against the strip at high speed to separate the deposits from the surface of the support and guide them to a nearby suction port. Both of these methods are dry methods, but in contrast, wet removal methods involve introducing a strip into a cleaning solution tank.
Here, there are methods to remove the deposits using ultrasonic vibrations, and methods to blow and suck high-speed air after supplying a cleaning solution to the support (Japanese Patent Publication No. 13020-1983).
(see Publication No. 1), etc. are known. (Problems to be Solved by the Invention) Each of these methods includes problems. For example, in the method of capturing with a non-woven fabric or a blade, scratches on the support may occur due to friction.
Static electricity may be generated, and if a nonwoven fabric is used, the fibers of the nonwoven fabric themselves may fall off, resulting in failure of adhesion to the surface of the support. Although the high-speed air blowing method is effective in capturing relatively large deposits of several tens of microns or more, it is hardly effective for small deposits or strong deposits. In addition, regarding the above-mentioned wet removal method, the equipment becomes very large and when removing deposits from a strip running at high speed, a large amount of mist is generated. This results in adhesion to the subsequent support. Therefore, as disclosed in JP-A-59-150571, the applicant applied a solvent to the surface of the support, and while the solvent remained, two fixed plates were attached to the surface of the support. We proposed a method of removing a portion of the solvent and the deposits by pressing the dust against the dust, but after that, we conducted intensive research on methods and devices with even higher dust removal efficiency, and finally put the present invention into practical use. (Object of the Invention) The present invention has been made in view of the problems of the prior art described above, and provides a method and device that can more efficiently remove dust from a support using a compact device and method. The purpose is to (Means for Solving the Problems) This object of the present invention is to apply a solvent to one side of a flexible support, and while the solvent remains, to apply a solvent to one side of the support in the direction of travel of the support. The solvent-wetted surface of the rod member rotating in the opposite direction is brought into close proximity to transfer the deposits on one side of the support to the outer peripheral surface of the rod member, and then the deposits are removed from the outer peripheral surface of the rod member. A method for removing dust from a flexible support, which is characterized by peeling off the dust; Bringing the solvent-wet surfaces of rod members rotating in opposite directions close to each other to transfer the deposits on one side of the support onto the outer peripheral surface of the rod member, and then peeling off the deposits from the outer peripheral surface of the rod member. A device for carrying out a method for removing dust from a flexible support by rotating the support, the rod member being connected to a rotational drive source and rotatable in a direction opposite to the running direction of the support, and a slit capable of supplying a solvent. This is achieved by a flexible support dust removal device characterized by comprising a block member which has the following features and is capable of rotatably holding the rod member. Note that the rod member preferably has an outer diameter of 1 mmφ to 50 mmφ. Hereinafter, embodiments of the present invention will be described in detail based on the attached drawings. FIG. 1 is a schematic sectional view showing an example of the device of the present invention, and FIG. 2 is a perspective view (details of blocks are omitted) showing the operating state of the device. The support 1 is mounted between a plurality of guide rollers 2, and is conveyed in a predetermined direction (arrow A) at a constant speed. The support body 1 is disposed between the guide rollers 2 and 2.
A rod 3 is disposed which can make contact with the surface to be dusted at a slight wrap angle and is rotatable at a fairly low speed, for example 0.1 cm/sec, in a direction B opposite to the running direction A of the support 1. There is. The rotational drive source 4 for the rod 3 may be of any type as long as it can provide a low-speed rotational output, but a hydraulic or pneumatic motor is preferable in consideration of environmental safety such as solvent gas concentration. . The rod 3 usually has a diameter of 1 mmφ to 50 mmφ and at least its surface material is made of cemented carbide (for example, WC).
-TAC) or hard body [fine ceramics (e.g. alumina A-150, zirconia)]
A material finished with a surface roughness of 1.0 μm to 0.05 μm in Rmax is used, and its surface length is set larger than the total width of the support 1. Further, the rod 3 is rotatably held by a block 5 having a width approximately equal to the surface length of the rod 3. The inside of the block 5 is divided by slits 6 and 7, and has partition walls 8, 9, 10 defining each slit 6, 7. The upper end surfaces of the partition walls 9 and 10 are connected to the rods 3
In order to hold the rod 3, the rod 3 is curved with a radius substantially equal to that of the rod 3, and the partition wall 10 on the downstream side is
A plurality of liquid outlets 11 are transparently provided at appropriate intervals in the width direction below the curved upper end surface. Further, on the outside of the partition walls 8 and 10, an outer wall 12-
Reservoir 13- defined by 1 and 12-2
1 and 13-2 are provided. On the other hand, the slits 6 and 7 communicate with a solvent supply system consisting of a solvent supply tank 15, a pressurizing pump 16, and a filter 17.
xylol, butyl acetate, etc.), and most of the solvent is discharged from the upper part of the slit 6 and the liquid outlet 11 to the liquid retainers 13-1 and 13-2,
The solvent is collected in the solvent supply tank 15 as required. In the apparatus of the present invention configured as described above, when the support 1 is moved in the direction of the arrow A, the surface of the support 1 to be dusted and the deposits 18 are rotated in the direction B opposite to the support 1. When approaching the surface of the rod 3, it is separated from the surface of the support 1 due to the rotation of the rod 3 and the action of the solvent applied to the support through the slit 6, and is transferred to the surface of the rod 3, Further, as the rod 3 rotates, it is carried to the upper end of the slit 6. On the other hand, the deposits 1 transferred onto the surface of the rod 3
While passing through the upper ends of the slits 6 and 7, the rod 8 is separated from the surface of the rod 3 by the cleaning action of the solvent supplied into the slits 6 and 7, and is removed from the liquid outlet. Upper part of slit 6 and 11
It is then discharged to the outside. By continuing to rotate the rod 3, the surface of which has been moistened by the solvent, the effect of transferring deposits 18 onto the moistened surface is increased. FIG. 3 is a schematic sectional view showing another embodiment of the present invention, and shows an apparatus in which the solvent application section (slit 6) of FIG. Note that other symbols are the same as in FIG. 1. Furthermore, the lap area between the support 1 and the rod 3 is
The solvent layer on the support creates small gaps that allow fine deposits to pass through and cause incomplete removal. It is preferable that the grout 19 is provided opposite the rod 3. In addition, when there is a large amount of deposits 18 on the support 1, a large number of deposits 18 are deposited on the same position on the surface of the rod 3, and as a result of their accumulation, the gap between the support and the rod surface becomes localized. This increases the amount of adhesion and allows the adhesion to pass through, making its removal incomplete. Therefore, it is desirable to provide at least a device for sliding the rod 3 in the width direction of the support. (Example) While transporting polyethylene terephthalate (support) having a thickness of 38 μm and a width of 500 mm at a speed of 200 m/min, xylol solvent was first applied to one side of the polyethylene terephthalate using a well-known roll coater.
100 c.c./m ² was applied, and while this solvent remained, one side of the support 1 was removed from dust using xylene as a solvent using a dust removing device similar to that shown in FIG. Various coating devices 20 (patent application 1983-
94657), apply a magnetic coating solution according to Table 1 on one side of the support 1 in an undry state to a thickness of 3 μm, 5 μm,
The coating was applied to a thickness of 10 μm, and the occurrence of pinholes and streaks on the coated surface was measured. Rod 3 in the dust removal device is made of cemented carbide (WC-TAC) with a diameter of 6 mmφ and a rough surface.
The conditions were set to Rmax of 0.5 μm and circumferential speed of 0.5 cm/sec. The amount of xylene supplied to the slit 7 was 500 c.c./min. The magnetic coating liquid used in the examples was prepared by placing the composition shown in Table 1 in a ball mill, thoroughly mixing and dispersing it, and then adding an epoxy resin (epoxy equivalent: 500).
30 parts by weight was added and uniformly mixed and dispersed to obtain a magnetic coating liquid.

[Table] The results were as shown in Table 2. (Comparative Example) A magnetic coating liquid was applied under the same conditions as in the example above, except that the solvent pre-coating and the dust removing device were not used, and the occurrence of pinholes and streak failures on the coated surface was measured. The results were as shown in Table 2.

[Table] (Effects of the Invention) As described above, the present invention provides (1) the outer peripheral surface of the rod 3 rotating in the direction B opposite to the running direction A of the support 1 to the surface of the support 3 to be dust-removed; Since they are placed in sliding contact with each other, a large velocity distribution occurs in the atmosphere near the surface of the support 3 to be dust removed, and the deposits 18 on the surface of the support 3 are lifted up on the surface of the support and are further removed from the surface of the rod 3. (2) Also, since the solvent was supplied inside the slits 6 and 7, the deposits 18 on the surface of the rod 3 were removed.
Since the solvent is washed with the solvent and discharged to the outside, and the surface of the rod 3 is moistened, the transfer effect of the matter adhering to the surface of the support 3 can be further enhanced. This has the effect that dust can be removed from the support more effectively.

[Brief explanation of drawings]

FIG. 1 is a schematic sectional view showing an example of the device of the present invention;
Fig. 2 is a perspective view showing the operating state of the device (details of the blocks are omitted), Fig. 3 is a schematic sectional view showing another example of the device of the present invention, and Fig. 4 is an example showing the dust removal state of the support body. This is the coating device used for the determination. 1... Support body, 2... Guide roller, 3...
Rod, 4...Rotary drive source, 5...Block, 6
...Slit, 7...Slit, 8...Bulkhead, 9
...Partition wall, 10...Partition wall, 11...Liquid outlet, 12
-1...Outer wall, 12-2...Outer wall, 13-1...
Liquid reservoir, 13-2... Liquid reservoir, 15... Solvent supply tank, 16... Pressure pump, 17... Filter, 18... Deposit, 19... Bucking roll, 20... Coating device, 21 ...Magnetic coating liquid, 2
2...Roll coater, A...The running direction of the support 1, B...The rotating direction of the rod 3.

Claims (1)

[Claims] 1. A solvent is applied to one side of a flexible support, and while the solvent remains, a rod member that rotates in the opposite direction to the running direction of the support is applied to one side of the support. A flexible material characterized in that the solvent-wetted surfaces are brought close to each other to transfer the deposits on one side of the support onto the outer circumferential surface of the rod member, and then the deposits are peeled off from the outer circumferential surface of the rod member. Method for removing dust from sexual supports. 2 Apply a solvent to one side of a flexible support, and while the solvent remains, bring the solvent-wetted surface of a rod member that rotates in the opposite direction to the running direction of the support close to one side of the support. Then, after the deposits on one side of the support are transferred to the outer circumferential surface of the rod member, a dustproof method for a flexible support is carried out by peeling off the deposits from the outer circumferential surface of the rod member. The device has a rod member connected to a rotational drive source and rotatable in a direction opposite to the running direction of the support, and a slit capable of supplying a solvent, and capable of rotatably holding the rod member. What is claimed is: 1. A dust removal device for a flexible support, characterized by comprising a flexible block member. 3 The rod member has an outer diameter of 1 mmφ to 50 mm.
The dust removal device for a flexible support according to claim 2, characterized in that the diameter is φ. 4 The rod member has a circumferential speed of 0.1 cm/sec.
Claim 2 characterized by the above
A dust removal device for a flexible support according to item 1 or 3. 5. At least the surface material of the rod member is cemented carbide or a hard body, and the surface roughness is
The dust removal device for a flexible support according to claim 2 or 3, characterized in that Rmax is 1 μm to 0.05 μm.