JPS6265872A - Method and device for removing material stuck on surface of flexible supporting body - Google Patents

Abstract

PURPOSE:To remove material stuck on the surface of a flexible supporting body without injuring the surface of the flexible supporting body by applying solvent on the flexible supporting body and pressing a blade on the surface of the supporting body before the solvent evaporates, together with the solvent. CONSTITUTION:A flexible supporting body 1 stuck with a material 2, is applied with a solvent film 3 on its surface, and passed between rollers 5 and 6. Here, a blade 4 is arranged between the rollers 5 and 6 along the direction of the width of a flexible supporting body 1 and perpendicular to the running direction. And by pressing the blade 4 against the flexible supporting body 1, stuck material 2 is scraped off the surface of the flexible supporting body 1 together with part of solvent film 3. Here, a blade surface 11 of the blade 4 which faces the flexible supporting body 1 is made to curve with radii of curvature of 2-30mm. The angles alpha at which the flexible supporting body enters the blade 4 are set to from 0.5-2 deg. and the angles beta at the side edge of the blade 4 where the flexible supporting body enters are set to below 90 deg..

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a method and apparatus for removing surface deposits from a flexible support (hereinafter referred to as "support").

In addition, the "support" as used in the present invention generally refers to polyethylene terephthalate, polyenalene-2.6-naphthalate, polyethylene terephthalate, polyenalene-2,6-naphthalate, etc. whose width is several α to several meters, length is several tens of meters or more, and thickness is several μm to several 100 μm. Plastic films such as cellulose diacetate, cellulose triacetate, cellulose acetate globionate, polyvinyl chloride, polyvinylidene chloride, polycarbonate, polyimide, polyamide, etc.; Paper with 2 carbon atoms such as polyethylene, polypropylene, ethylene butene copolymer, etc. A flexible strip made of paper coated or laminated with ~10 α-polyolefins; metal foil such as aluminum, copper, tin, etc., or preliminary processing on the surface using the strip as a base material. Included are strips that form the layer.

Furthermore, 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 dried after 9 days. , which can be cut to the desired width and length;
Typical products include various photographic films, photographic papers, magnetic tapes, and magnetic disks.

[Conventional technology]

Conventionally, the following methods are well known as methods for removing substances deposited on the surface of a support.

That is, first, by pressing a non-woven fabric or blade held in an appropriate manner against a support, the surface deposits are captured by the non-woven fabric or blade, or by blowing clean air against the strip at high speed. There is a method in which deposits are peeled off from the surface of the support and guided to a nearby suction port. All of these are dry methods,
On the other hand, wet removal methods include a method in which a strip is introduced into a cleaning liquid tank and the deposits are dispersed using ultrasonic imaging, or a method in which a cleaning liquid is supplied to the support and then high-speed air is applied. Method of spraying and suctioning
No. 0 Publication Examination) etc. are known.

[Problem that the invention seeks to solve]

Each of these methods includes problems. For example, in the method of capturing with a non-woven fabric or a blade, there is generation of pickling liquid and static electricity on the support due to friction, and in the case of using a non-woven fabric, failure of adhesion to the surface of the support occurs due to the 9 fibers of the non-woven fabric falling off themselves.

The high-speed air blowing method is effective in capturing relatively large deposits of several tens of microns or more, but it is effective in capturing small deposits,
Or, for deposits with strong adhesion, the effect is rarely observed. 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.

In addition, although the ability to remove adherents from the support is generally best achieved by scraping with a sharp blade, using only the fixed blade is likely to cause scratches on the support, and it is also susceptible to static electricity.
In practice, there is a limit to the ability to remove deposits due to the fact that deposits are stuck to the tip of the blade or are sticky. In addition, the present applicant previously proposed a method for removing deposits using two plates (blades) after applying a solvent to the surface of the support as an improved method for removing deposits from a support using a blade (Japanese Patent Application Laid-Open No. 59-150571].

According to this method, the drawbacks of the conventional method described above could be overcome, but since the direction of the support into the blade was tangential to the blade edge on the support entry side, some of the deposits were deposited on the blade. It also happens that some of the deposits get stuck on the upper end surface and cannot be removed completely and remain on the support.

Therefore, it is an object of the present invention to further improve the above method and provide a method and apparatus for more effectively removing deposits from the surface of a flexible support.

[Means for Solving the 2 Problems] As a result of further studies on the method for removing deposits on the support by applying a solvent and using a blade, the present inventors have developed the present invention described below. It has been found that the above object can be achieved by the following method.

That is, the present invention involves applying a solvent to a flexible support whose surface has deposits to be removed, and then pressing a single blade that satisfies the following conditions onto the surface of the support before the solvent evaporates. A method for removing deposits on the surface of a flexible support, characterized in that the deposits are removed together with a part of the common agent 1) The blade is arranged substantially perpendicular to the traveling direction of the support, 2) The blade has a surface facing the support that is longer than the width of the support in the width direction and shorter in the running direction, and 3. 4) The blade is curved, and its curvature r is 2 to 3011IB. 5) the angle of the end edge of the blade on the support entry side is 90' or less, and 6) the play angle is At least the surface portion is covered with a hard alloy, a hard body, or this material, and the surface has a roughness of 0.5 μm or less in terms of Rmax.

The present invention also provides an apparatus for applying a solvent to the surface of a flexible support having a layer on its surface that can be removed; This is an apparatus for removing deposits on the surface of a flexible support, characterized in that the blade satisfies the following conditions.

1) The blade is arranged approximately perpendicular to the traveling direction of the support. 2) The blade has a surface facing the support that is longer than the width of the support in the width direction and shorter in the running direction. 3) the surface of the blade facing the support is curved with a curvature r of 2 to 30 degrees, and 4) the blade enters the blade of the support with respect to the support. 5) The angle of the edge of the blade on the entry side of the blade is in a relationship of 0.5 to 2° with respect to the tangent at the tip of the leading edge of the blade to deeply wrap the support; 6) The blade is made of a super hard metal, a hard body, or a member coated with this material on at least the surface portion 1, and the surface has an irregularity of 15 μm or less in Rmax.

In the present invention, after a solvent film is formed on the surface of a support, a part of the solvent film is scraped off together with deposits using a single blade having a curved end surface, thereby preventing the deposits from entering the blade end surface. The angle of entry of the support into the blade was defined as described above. The inventors used a microscope to closely observe the angle at which the support enters the blade, and found that the support itself has rigidity and that the blade Even if the support should have entered from the tangential direction of the curvature of the edge on the entry side of the support, due to its rigidity, the support may float up from the tangential direction at the tip of the front edge and enter. It was revealed.

As a result, it has been found that the support can be tangentially entered into the edge tip by wrapping the support at an angle in the range α5° to 2° deeper than the tangential direction.

It has also been revealed that if the support is wrapped at an angle greater than that, the support will come into direct contact with the blade on the blade entry side, causing scratches. In addition, in the present invention, the range of the wrap is in the range of 0.5° to 2° because the rigidity changes depending on the thickness of the support, and the edge tip of the support changes depending on the curvature of the blade. It was also found that this occurs because the amount of lift changes.

Therefore, by moving the support into the tip of the blade edge VC at an angle in the range of 0.5° to 2° relative to the tangential direction, it is possible to scrape off the accompaniment along with the drug film and damage the support. It is now possible to remove deposits without any problems.

If there seems to be a lot of deposits on the support, support the blade to prevent the deposits from accumulating at the same position on the blade entrance edge and locally increasing the gap between the blade and the support. It is necessary to slide the blade in the width direction of the body, and the length of the blade support in the width direction in the present invention also needs to be appropriately longer than the width of the support.

Further, as will be described later, the blade has a surface facing the support, and that surface is curved with a curvature r of 2 to 50 square meters.

The reason why the curvature of the facing surface is selected within this range is that since the rigidity varies depending on the thickness of the support, it is necessary to adjust the wrap condition of the support to the curved surface of the blade. For example, when the thickness of the support is around 5 μm, the curvature of the blade is 2 to 5 μm.
The blade curvature is preferably 3 m, and when the thickness of the support is around 100 μm, the blade curvature is preferably 20 to 30 mm. In the present invention, the angle of the edge of the blade at the end on the support body entry side is 90°
Preferably, the angle is between 80° and 50°, and if the angle is larger than 90°, the support will easily float on the blade incidence side, making it easier for deposits to enter onto the blade.

Further, the blade is made of a hard material such as cemented carbide such as we-'rAc, fine ceramics, alumina A-150, zirconia, etc., or a member whose surface is coated with these materials at least, and the surface thereof is Rmax. 15μ
It has a roughness of m or less, that is, a high degree of smoothness.

The present invention will be described in detail below with reference to the drawings.

FIG. 1 is a perspective view showing an example of the present invention (the solvent coated part is omitted). In FIG. 1, a support 1 with deposits 2 is applied with a solvent film 6 and is then bypassed by rollers 5.6 by means of a support transport device. Further, blades 4 are arranged between the rollers 5 and 6, extending substantially in the width direction of the support 1 and perpendicular to the direction of movement of the support. The blade 4 is pressed against the support to scrape off 301 parts of the solvent film and the deposits 2 from the surface of the support 1.

FIG. 2 is a schematic cross-sectional view showing an example of the blade in the present invention, and shows how deposits are removed. As described above, the surface 11 of the blade 4 facing the support 1 is curved with a curvature r of 2 to 30 m. The support body 1 is placed at an angle α'! from the tangential direction n of the curve of the blade surface. 1-0.Enter in a wrapped state of 5° to 2°.

By bending one blade 4 at the above-mentioned curvature, the amount of solvent passing through the support body 1 and the blade 4 can be minimized.
It became possible to suppress the zero gap to 2 μm or less. In addition, by allowing the support 1 to wrap around the blade surface by 5 DEG to 2 DEG in the direction of contact with the blade surface, a structure is obtained in which deposits are less likely to get onto the blade 4. In addition to the above two points, the effect of removing deposits is that deposits on the order of several microns can be removed.

Further, the angle β of the leading edge of the support 1 of the blade 4 is 90° or less.

Furthermore, the solvent used in this step basically only needs to be one that can stably form a liquid film on the support, and does not need to have the ability to dissolve deposits. However, it is naturally necessary to select a solvent that does not cause any quality problems on the surface of the support. As the solvent, xylol, butyl vinegar, etc. are used. It may be determined as appropriate whether the scraping solvent is recycled or not, and whether or not heat evaporation is performed after the above-mentioned step.

By the above method, the drawbacks of the prior art can be eliminated, and deposits can be effectively removed without causing any quality problems on the surface of the support.

〔Example〕

The present invention will be explained in more detail below using examples in which the present invention is applied to a magnetic tape support. A schematic diagram of that embodiment is shown in FIG. The schematic diagram of the blade section is the same as in FIG. The blade surface 11 of the blade 4 has a curvature ri of 12 m, and the edge angle on the incident side of the support is 70°. The tangential direction of the blade 4 is ±Do with respect to the horizontal, and the approach angle of the support is 19° (α=1°) with respect to the horizontal. The distance between rolls 5 and 6 is 40
0 songs, and Blade is somewhere in between.

Other conditions are as follows.

Support: Material: polyethylene terephthalate Thickness: 58μ Width: 500m+ Solvent: Kinroll In the magnetic tape coating process, the above-mentioned deposit removal device was installed before applying the magnetic liquid, and the running speed was 150 m/min.
A roll coater 7 is used to coat one side of the support, which is running at a tension of 20 to 1500, with 100 rolls of pheasant roll 8.
(X, 7m", then passed through the above-mentioned deposit removal equipment section, and then completely removed the solvent in a 5m long solvent hot air evaporation section. Then, as shown in Fig. 4. The magnetic liquid 10 is applied in liquid form to the support 1 to a thickness of 7 μm by the method described in Japanese Patent Application No. 59-94657 using a coating device 9 similar to the above.
Coated to a thickness of 0 μm, 120 μm, and 30 μm, respectively.
At that time, the occurrence of coating leakage was investigated. In addition to complete coating in the form of pinholes and streaks, the term "coating through-out" also includes 9 areas of thin coating with a coating thickness of 50% or less of the specified thickness. When a sliver-like coating occurred continuously for about 100 m, at that point, the magnetic layer coating was stopped and recoated to restore a good condition, and then the investigation was continued. In addition, coating omissions were continuously detected using a defect detector before winding up, and the frequency of occurrence was divided into pinholes and stripes and was ascertained.

For comparison, a magnetic layer was coated under the same conditions as above without removing the deposits on the support, and JP-A-59-15057.
The frequency of this occurrence was investigated using the deposit removal device shown in 1. The magnetic coating liquid used in the above experiment was as follows.

After putting each component of the composition shown in Table 1 into a ball mill and thoroughly mixing and dispersing,
00) was mixed and dispersed uniformly with the addition of 50 layers of soybean powder to obtain a magnetic coating liquid.

Table 1 As a result, the shear velocity was 108 θc-'ic, and the result was 8 1θe.
At 1 or 500θθC-1, 1 poise was shown.

For each level, data was collected for 10 original fabric bases with a length of 4000 m. The results are shown in Table 2. The values in Table 2 represent the average frequency of occurrence per raw fabric base.

Table 2 [Effects of the Invention] According to the present invention, even small deposits can be almost completely removed without causing scratches or the like on the support.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an example of the present invention (the core coating part is omitted). FIG. 2 is a schematic cross-sectional view of the blade part in the present invention. FIG. Figure 4 shows a magnetic layer coating device used in the Examples to evaluate the surface properties of the support. DESCRIPTION OF SYMBOLS 1...Support, 2...Deposition on support, 3...Solvent layer, 4...Blade, 5...Upstream detour roller, 6...Lower fi 1ll (11 detour roller ,7...
・Roll coater +, 8... Kinroll, 9... Coating device, 10... Magnetic coating liquid procedure amendment November 1985 50

Claims (2)

[Claims] (1) After applying a solvent to a flexible support whose surface has deposits to be removed, before the solvent evaporates, the solvent is removed by pressing a single blade that satisfies the following conditions onto the surface of the support. A method for removing deposits on the surface of a flexible support, characterized in that: 1) the blade is arranged substantially perpendicular to the traveling direction of the support; 2) the blade 3) The blade has a surface facing the support that is longer than the width in the width direction of the support and shorter in the running direction, and 3) the surface of the blade facing the support is curved, and the curvature r is 2 to 30 mm, 4) The blade enters the support into the blade at an angle of 0.5 to 2° with respect to a tangent at the tip of the entering edge of the blade surface. 5) The edge of the blade on the support entry side has an angle of 90°.
and 6) the blade is made of a super hard alloy, a hard body, or a member whose surface is coated with this material, and the surface is R
The roughness is 0.5 μm or less in _m_a_x. (2) A device for applying a solvent to the surface of a flexible support having deposits to be removed on its surface; An apparatus for removing surface deposits from a flexible support, characterized in that the blade satisfies the following conditions: 2) the blade is longer in the width direction of the support than the width thereof;
The blade has a short surface facing the support body in the running direction, and 3) the surface of the blade facing the support body is 2 to 30 mm long.
4) The blade is curved with a curvature r of 5) The edge of the blade on the support entry side has an angle of 90°.
6) The blade is made of a super hard alloy, a hard body, or a member whose surface is coated with this material, and the surface is curved.
The roughness is 0.5 μm or less in _m_a_x.