JP2000011368A - Magnetic tape surface treatment equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a magnetic tape surface treatment apparatus excellent in an effect of removing protrusions and foreign matters of a magnetic tape without removing a lubricant present on a magnetic coating surface of a magnetic tape. SOLUTION: A tape surface treatment device 10 has a transport path 14 for running a magnetic tape 12 in the direction of an arrow F along the longitudinal direction thereof, a rotating member 16, and a pair of guide rolls 1.
8 and 18 are provided. The rotating member 16 includes a rotating body 16A having a cylindrical shape, and a blade 16B provided on an outer peripheral surface of the rotating body 16A. The rotating member 16
The axis of the rotating body 16 </ b> A extends in a direction perpendicular to the longitudinal direction of the magnetic tape 12, and the blade 16 </ b> B is disposed on the transport path 14 so as to contact the magnetic coating surface of the magnetic tape 12. Also, a blade 16B that contacts the magnetic coating surface of the tape 12
There is provided a rotation driving means (not shown) for rotating in the direction of arrow d such that the moving direction of the magnetic tape 12 is opposite to the running direction F of the magnetic tape 12.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic tape surface treatment apparatus which removes protrusions generated on a magnetic coating surface and foreign substances adhering to the magnetic coating surface in a process of manufacturing a magnetic tape to reduce dropout.

[0002]

2. Description of the Related Art As a method of manufacturing a magnetic tape, a coating material in which a magnetic material, an adhesive and an additive are mixed is applied to a support, and the temperature and pressure are applied to smooth the coating film surface. In general, protrusions formed by aggregates existing in the above and foreign substances adhering during the manufacturing process are removed by a magnetic tape surface treatment apparatus. 2. Description of the Related Art Conventionally, protrusions or foreign matters of a magnetic tape are brought into contact with a sheet material (lapping tape) coated with an abrasive which travels in a direction opposite to the predetermined direction to a magnetic coating surface of the magnetic tape traveling in a predetermined direction. A magnetic tape surface treatment device that removes protrusions and foreign matter from the magnetic tape by bringing a fixed blade into contact with the magnetic coating surface of the magnetic tape running in a predetermined direction; Is used.

[0003]

The former magnetic tape surface treatment apparatus using a sheet material has an excellent effect of removing protrusions and foreign matters from the magnetic tape, but has an effect of removing the magnetic tape from the magnetic coating surface of the magnetic tape. This also removes the lubricant used at the same time, which has the disadvantage of reducing the durability of the magnetic tape. Further, when used for a long period of time, the polishing layer of the sheet material that comes into contact with the magnetic tape is clogged, and the effect of removing protrusions and foreign matter from the magnetic tape is reduced.
On the other hand, in the latter magnetic tape surface treatment apparatus using a fixed blade, although the lubricant present on the magnetic coating surface of the magnetic tape is not removed, the effect of removing protrusions and foreign substances on the magnetic tape is not improved. Is inferior to the magnetic tape surface treatment apparatus. That is, these devices have advantages and disadvantages. The present invention has been devised in view of the above circumstances, and an object of the present invention is to remove protrusions and foreign substances on a magnetic tape without removing a lubricant present on a magnetic coating surface of the magnetic tape. An object of the present invention is to provide a magnetic tape surface treatment apparatus having excellent effects.

[0004]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a magnetic tape surface treatment apparatus for removing protrusions generated on a magnetic coating surface and foreign matters adhering to the magnetic coating surface in a magnetic tape manufacturing process. A transport path for running the magnetic tape along the longitudinal direction thereof is provided, a rotating member including a rotating body and a blade provided on an outer peripheral surface of the rotating body is provided, The rotating member is disposed in the transport path so that the axis of the body extends in a direction orthogonal to the longitudinal direction of the magnetic tape, and the blade contacts the magnetic coating surface of the magnetic tape, Rotary driving means for rotating the rotating member so that the moving direction of the blade in contact with the magnetic coating surface is opposite to the running direction of the magnetic tape is provided.

In the present invention, protrusions and foreign substances on the surface of the magnetic coating are effectively scraped off from the magnetic tape by the blade of the rotating member which is rotated in the direction opposite to the running direction of the magnetic tape. Lubricant contained in the surface is hardly removed by the blade.

[0006]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an explanatory view illustrating the configuration of an embodiment of a tape surface treatment apparatus according to the present invention, FIG. 2 is a perspective view illustrating a main part of a blade, and FIG. 3 is an explanatory view illustrating an operation of removing protrusions and foreign matter by the blade. It is.

Referring to FIG. 1, the configuration of the tape surface treating apparatus of the present embodiment will be described. The tape surface treatment apparatus 10 is provided with a transport path 14 for running the magnetic tape 12 in the direction of arrow F along the longitudinal direction thereof, a rotating member 16, and a pair of guide rolls 18.

The rotating member 16 is a rotating body 1 having a cylindrical shape.
6A and a blade 16B provided on the outer peripheral surface of the rotating body 16A. The rotating member 16 is disposed on the transport path 14 such that the axis of the rotating body 16A extends in a direction perpendicular to the longitudinal direction of the magnetic tape 12 and the blade 16B contacts the magnetic coating surface of the magnetic tape 12. Have been. Further, there is provided a rotation driving means (not shown) for rotating the blade 16 </ b> B in contact with the magnetic coating surface of the tape 12 in the direction of arrow d so that the moving direction of the blade 16 </ b> B is opposite to the running direction F of the magnetic tape 12.

A pair of guide rolls 18 are rotatably supported, and are provided on the transport path 14 so as to extend in a direction perpendicular to the longitudinal direction of the magnetic tape 12. The rotating member 16 is disposed between the two guide rolls 18, 18, and the magnetic tape 12 is disposed such that a portion of the magnetic tape 12 between the two guide rolls 18 is pressed against the blade 16 </ b> B.

As shown in detail in FIG. 2, the blade 16B comprises a wall 161 erected on the outer peripheral surface of the rotating body 16A and a wall 1
Cutting edge part 1 inclined from the upper part of 61 toward the rotation direction d
62. The blade 16B can be made of, for example, a material such as super steel or sapphire.

4, 5, and 6 show a rotating member,
(A) is a side view of the rotating member viewed from the axial direction, and (b) is a plan view of the rotating member. 4 and 5, the blade 16B is formed in a spiral shape, and the angle at which the blade 16B forms a spiral, that is, the angle perpendicular to the longitudinal direction of the magnetic tape 12, is set as the reference position L. And blade 16
The case where the twist angle which is the angle formed by B is 45 degrees and 15 degrees is shown. In the example shown in FIG. 6, the case where the twist angle is 0 degree is shown.

The operation and effect will be described with reference to FIGS. As shown in FIG. 3, the magnetic tape 12 has a magnetic coating surface 12A formed thereon.
Has uniform irregularities. In addition, magnetic coating surface 1
2A contains a lubricant. And the magnetic coating surface 1
2A, in the manufacturing process, the convex portions 12 of the irregularities described above are provided.
Protrusions 13A and 13B having a larger dimension in the height direction than B (hereinafter referred to as protrusions including foreign matter) are generated.

The magnetic tape 12 is made to travel in the direction of arrow F in the transport path 14 and
Is rotated in the direction of arrow d. Then, the blade tip 16 of the blade 16B in contact with the magnetic coating surface 12A of the magnetic tape 12
2 moves along the vertex of the protrusion 12B, and the protrusion 1
By colliding with 3A, 13B, these protrusions 13A,
13B is scraped off and removed. That is, the protrusion 13B
The part shown by the broken line is removed.

At this time, since only the apex of the convex portion 12B of the magnetic coating surface 12A is in contact with the blade edge portion 162, the lubricant contained in the magnetic coating surface 12A is hardly scraped off by the blade 16B. Absent. Further, as compared with the conventional device in which the fixed blade is brought into contact with the running magnetic tape to remove the protrusion, the blade 16B moves in the direction opposite to the running direction of the magnetic tape while rotating, so that the blade 16B The contact effect of the blade 16B on the protrusions 13A and 13B is enhanced by contacting the magnetic coating surface 12A many times.

FIG. 7 is a table showing the results of a comparison experiment between the conventional apparatus and the apparatus according to the present embodiment in the form of a table. The experimental conditions were as follows: the diameter of the rotating member 16 (including the blade 16B) was 20 mm;
The number of blades is 8, the twist angle of the blades is 45 degrees, the rotation speed of the rotating member is 1000 rpm, the pushing distance is 10 mm, the embed angle is 90 degrees, and the running speed of the tape is 200 m / m.
in. Note that the pushing distance indicates a distance from the reference position to the position of the magnetic tape pushed and moved by the rotating member 16 with the state where the rotating member 16 is not provided between the guide rolls 18 and 18 as a reference position. The embracing angle indicates an angle formed by the magnetic tape bent by being pushed by the rotating member 16.

The horizontal column in FIG. 7 shows the processing conditions of the magnetic tape, that is, the processing using the conventional apparatus using the abrasive sheet, the processing using the conventional apparatus using the fixed blade, and the processing using the rotating member according to the present invention. Four conditions are set in which the processing and the removal processing of the protrusions on the magnetic coating film surface are not performed. In the vertical columns, two evaluation items, durability and dropout, are set. The evaluation of each characteristic is evaluated in three stages of ○ (good), Δ (slightly poor), and × (bad). As shown in FIG. 7, according to the tape surface treatment apparatus of the present embodiment, both of the durability and the dropout characteristics could be evaluated better than the conventional apparatus.

FIG. 8 is a table showing experimental results of dropout characteristics measured by changing the diameter of the rotating member and the number of blades in the magnetic tape surface treating apparatus according to the present embodiment. The experimental conditions were as follows: the twist angle of the blade was 45 degrees, the rotation speed of the rotating member was 1000 rpm, and the pushing distance was 10 m.
m, hug angle 90 degrees, tape running speed 200
m / min. The diameter of the rotating member is 10 mm,
20 mm and 30 mm are set, and the number of blades is set to four and eight. The dropout of each experimental result is lower than that of the untreated product. The number of blades is 4
The dropout of eight cards is lower than that of eight cards.

FIG. 9 is a table showing experimental results of dropout characteristics measured by changing the twist angle of the blade of the rotating member in the magnetic tape surface treatment apparatus according to the present embodiment. The experimental conditions were as follows: the number of blades was 8, the number of rotations of the rotating member was 1000 rpm, the pushing distance was 10 mm, the hugging angle was 90 degrees, and the tape traveling speed was 200 m / m.
in. The twist angle of the blade is 15 degrees, 45 degrees,
It is set to 75 degrees.

FIG. 10 is a table showing the results of experiments in which the dropout characteristics were measured by changing the rotation speed of the rotating member in the magnetic tape surface treatment apparatus according to the present embodiment. The experimental conditions were as follows: the number of blades was 8, the twist angle of the blades was 45 degrees, the pushing distance was 10 mm, and the embracing angle was 90.
The running speed of the tape is 200 m / min.
The rotation speed of the rotating member is 200 rpm, 1000 rpm,
It is set to 2000 rpm.

FIG. 11 is a table showing experimental results of dropout characteristics measured by changing the pushing distance and the embracing angle of the rotating member in the magnetic tape surface treating apparatus according to the present embodiment. The experimental conditions were as follows:
Sheet, blade twist angle 45 degrees, rotating member diameter 20m
m, and the running speed of the tape is 200 m / min.
Pushing distance of rotating member is 5mm, 10mm, 20mm
In addition, the hugging angles are set to 44 degrees, 90 degrees, and 160 degrees.

FIG. 12 is a table showing experimental results obtained by measuring dropout characteristics while changing the running speed of the magnetic tape in the magnetic tape surface treating apparatus according to the present embodiment. The experimental conditions were as follows: the number of blades was 8, the twist angle of the blades was 45 degrees, the diameter of the rotating member was 20 mm, the pushing distance was 10 mm, the embracing angle was 90 degrees, and the rotation speed of the rotating member was 1000 rpm. The running speed of the magnetic tape is 100 m / min, 200 m / min, 300 m / min.
min.

FIG. 13 is a table showing experimental results of dropout characteristics measured by changing the combination of the rotation speed of the rotating member and the running speed of the magnetic tape in the magnetic tape surface treating apparatus according to the present embodiment. is there. Numerical values in the table indicate the number of dropouts (pieces / min). The experimental conditions were as follows: the number of blades was 8, the twist angle of the blades was 45 degrees,
The diameter of the rotating member is 20 mm, the pushing distance is 10 mm,
The hug angle is 90 degrees. The rotation speed of the rotating member is 200 rpm, 500 rpm, 1000 rpm, 1 rpm.
500 rpm and 2000 rpm, and the running speed of the magnetic tape was 100 m / min, 200 m / min, 300 rpm.
m / min.

[0023]

As is clear from the above description, the present invention
A magnetic tape surface treatment apparatus for removing protrusions and foreign substances adhering to a magnetic coating surface during a magnetic tape manufacturing process, wherein a transport path for running the magnetic tape along its longitudinal direction is provided. Provided, a rotating body, a rotating member configured by a blade provided on the outer peripheral surface of the rotating body is provided, the axis of the rotating body extends in a direction orthogonal to the longitudinal direction of the magnetic tape, And, the rotating member is disposed on the transport path such that the blade contacts the magnetic coating surface of the magnetic tape, and the moving direction of the blade that contacts the rotating member with the magnetic coating surface is the moving direction of the blade. Rotation driving means for rotating the magnetic tape in a direction opposite to the running direction is provided. Therefore, in the present invention, protrusions and foreign substances on the surface of the magnetic coating film can be effectively scraped off from the magnetic tape by the blade of the rotating member which is rotated so as to be in the direction opposite to the running direction of the magnetic tape, and The lubricant contained in the coating surface is hardly removed by the blade.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram illustrating a configuration of an embodiment of a tape surface treatment apparatus of the present invention.

FIG. 2 is a perspective view showing a main part of a blade.

FIG. 3 is an explanatory view showing an operation of removing protrusions and foreign matter by a blade.

4A and 4B are diagrams illustrating a rotating member having a twist angle of 45 degrees, wherein FIG. 4A is a side view, and FIG. 4B is a plan view.

5A and 5B are diagrams illustrating a rotating member having a twist angle of 15 degrees, wherein FIG. 5A is a side view and FIG. 5B is a plan view.

FIGS. 6A and 6B are diagrams illustrating a rotating member having a twist angle of 0 °, wherein FIG. 6A is a side view and FIG. 6B is a plan view.

FIG. 7 is a table showing the results of a comparative experiment between a conventional device and the device according to the present embodiment.

FIG. 8 is a diagram showing, in a table format, experimental results obtained by measuring dropout characteristics by changing the diameter of the rotating member and the number of blades in the magnetic tape surface treatment apparatus according to the present embodiment.

FIG. 9 is a table showing experimental results of dropout characteristics measured by changing the twist angle of the blade of the rotating member in the magnetic tape surface treatment apparatus according to the present embodiment.

FIG. 10 is a diagram showing, in a table format, experimental results obtained by measuring dropout characteristics while changing the number of rotations of a rotating member in the magnetic tape surface treatment apparatus according to the present embodiment.

FIG. 11 is a diagram showing, in a table format, experimental results obtained by measuring dropout characteristics by changing the pushing distance and the embracing angle of the rotating member in the magnetic tape surface treatment apparatus according to the present embodiment.

FIG. 12 is a diagram showing, in a table form, experimental results obtained by measuring dropout characteristics while changing the running speed of the magnetic tape in the magnetic tape surface treating apparatus according to the present embodiment.

FIG. 13 is a diagram showing, in a table format, experimental results obtained by measuring dropout characteristics by changing the combination of the rotation speed of the rotating member and the traveling speed of the magnetic tape in the magnetic tape surface treatment apparatus according to the present embodiment.

[Explanation of symbols]

Reference numeral 10: magnetic tape surface treatment device, 12: magnetic tape, 14: transport path, 16: rotating member, 16A: rotating body, 16B: blade, 18: guide roll.

Claims (7)

[Claims] 1. A magnetic tape surface treatment apparatus for removing protrusions generated on a magnetic coating surface and foreign substances adhering to the magnetic coating surface in a process of manufacturing the magnetic tape, wherein the magnetic tape is moved along its longitudinal direction. A transport path for traveling is provided, and a rotating member including a rotating body and a blade provided on an outer peripheral surface of the rotating body is provided, and a direction in which an axis of the rotating body is orthogonal to a longitudinal direction of the magnetic tape. And the rotating member is disposed on the transport path so that the blade contacts the magnetic coating surface of the magnetic tape, and the blade contacts the rotating member with the magnetic coating surface. A magnetic tape surface treatment apparatus, wherein a rotation drive unit is provided for rotating the magnetic tape so that the moving direction of the magnetic tape is opposite to the running direction of the magnetic tape. 2. The conveyance path has two guide rolls extending in a direction perpendicular to a longitudinal direction of a magnetic tape, wherein the rotating member is disposed between the two guide rolls, 2. The magnetic tape surface treatment device according to claim 1, wherein the magnetic tape is disposed such that a portion of the magnetic tape between the two is pressed against the blade. 3. The magnetic tape surface treatment device according to claim 1, wherein a plurality of the blades are formed. 4. The magnetic tape surface treatment apparatus according to claim 1, wherein the blade is formed in a spiral shape. 5. A twist angle, which is an angle formed by the blade and the blade, which is an angle formed by the blade, that is, an angle perpendicular to the longitudinal direction of the magnetic tape, is a reference angle.
6. The magnetic tape surface treatment apparatus according to claim 5, wherein the magnetic tape has a degree of not less than 75 degrees. 6. The magnetic tape surface treatment apparatus according to claim 1, wherein the rotating body has a cylindrical shape. 7. The magnetic tape surface treatment apparatus according to claim 1, wherein the blade is made of a super steel material or sapphire.