JP3463348B2 - Transport roll and method for manufacturing magnetic recording medium using the same - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a conveying roll for supporting a flexible sheet-like base material such as a base film of a magnetic recording medium at a wrapping angle so that it can be continuously run.

[0002]

2. Description of the Related Art Generally, when a magnetic layer is formed by coating on a flexible sheet-like substrate such as a base film of a magnetic recording medium by a die coater, the above-mentioned base film should be run and transported as much as possible. It is necessary to prevent the base film from being deformed such as wrinkles. This is because deformation of wrinkles or the like in the base film causes uneven tension, which causes uneven coating thickness when the magnetic coating material is applied.

Conventionally, in order to suppress the deformation such as wrinkles that tends to occur in the base film, a banana-shaped carrier roll whose surface member is made of rubber and has a warp whose center axis is curved, is used. It has been proposed that the entire width of the base film be evenly expanded by supporting the base film with the conveying rolls at a predetermined inclination angle and continuously running the base film.

[0004]

By the way, when the above banana-shaped transport roll is used, when the tension, thickness, or profile of the base film is changed during the transport, the curved warp You have to adjust the angle. At this time, if the angle adjustment is incomplete, excessive pressure will be applied to the central portion or both end portions of the base film. Therefore, the base film is highly likely to be deformed such as wrinkles, and the possibility of uneven coating thickness at the time of applying the magnetic coating material increases. Further, there is also a problem that the wrap angle with the base film is necessarily limited to a narrow range due to the structure having a curved warp.

Therefore, as the transport roll, a large number of ring-shaped grooves are formed on the surface of the roll at equal intervals, and the ring-shaped grooves have a predetermined inclination angle from the central portion toward both end portions. Has been devised. If the base film is transported using this transport roll, the angle adjustment as in the case of using the banana-shaped transport roll is completely unnecessary, and the tension and thickness of the base film can be adjusted according to the profile. unnecessary. Further, due to the ring-shaped groove of the transport roll, the base film is gradually expanded outward from the center thereof, and deformation such as wrinkles is shaped.

However, even when the above-mentioned transport roll is used, the following problems occur. That is, while the ring-shaped groove corrects the deformation such as wrinkles of the base film, the base film falls into these ring-shaped grooves when the base film is conveyed, and many ring-shaped irregularities are formed on the surface of the base film. Ring-shaped unevenness is formed when the paint is applied. Therefore, when the base film is to be coated on its surface, it is hard to say that the transport roll having the ring-shaped groove is suitable.

The present invention has been proposed in view of the above-mentioned various problems, and an object of the present invention is to uniformly spread it over the entire sheet-like substrate and substantially completely suppress the generation of wrinkles and the like. Therefore, it is another object of the present invention to provide a transport roll that can significantly improve the yield and reliability of products using a sheet-shaped substrate.

[0008]

Conveying rolls of the present invention SUMMARY OF THE INVENTION may, for the sheet substrate having flexibility and support at a predetermined winding angle is intended to continuously running, the center
On the outer circumference of the shaft, the full width from one end side to the other end side of the central shaft
A rubber outer periphery with a uniform thickness is formed
On the surface of the outer peripheral portion, spiral multiple grooves having a uniform pitch are formed symmetrically from the central portion to both end portions,
The multiple groove is 10 ° from the center toward both ends.
Has a 50 ° tilt angle, and depth of the multi-groove is being gradually larger toward the both end portions from the central portion
Characterized in that that.

In this case, a base film of a magnetic recording medium is mainly assumed as the sheet-like substrate.

[0010]

Then, the base film is conveyed by using the above-mentioned conveying roll, and a magnetic layer is formed by coating on the surface thereof.

[0012]

In the transport roll according to the present invention, the central axis
On the surface of the outer peripheral part made of rubber formed on the outer periphery of the multi-way groove is provided symmetrically with equal pitch from the center to both ends, and the multi-way groove extends from the center to both ends. The angle of inclination is 10 ° to 50 °, and the depth of the multiple groove is gradually increased from the central part toward both ends. Therefore, continuously running is supported at a predetermined winding angle by the transporting roll the sheet substrate
At this time, since the multiple grooves are formed in a spiral shape, the tension from the transport roll is uniformly applied to the entire sheet substrate without being localized. At this time, since the multiple groove has a structure having an inclination angle from the central portion toward both ends and the depth thereof gradually increases, the tension from the transport roll is applied to the sheet-shaped substrate. Appropriately added in the direction from the center to both ends, wrinkles and the like that tend to occur on the sheet-like substrate during running are almost completely suppressed.

[0013]

EXAMPLES Examples in which the transport roll according to the present invention is used for transporting a base film, mainly when producing a magnetic tape, will be described in detail below with reference to the drawings.

In general, when a magnetic film is applied and formed on a flexible sheet-like substrate such as a base film of a magnetic recording medium by a die coater, the base film is deformed such as wrinkles to cause uneven tension. In order to prevent uneven coating thickness that occurs when the magnetic coating material is applied, it is necessary to prevent the base film from being deformed such as wrinkles when the base film is run and conveyed.

Therefore, in the present embodiment, in order to suppress the deformation of wrinkles or the like that is likely to occur in the base film, the base film carrying roll 1 is installed by the carrying means as shown in FIG. The transport means is configured by arranging the transport roll 1 and guide rolls 3 and 4 for abutting the base film 2 transported from the transport roll 1 for further traveling, in parallel. .

In the above conveying means, the conveying roll 1
The base film 2 is supported on the transport roll 1 at a contact angle a with a predetermined wrapping angle φ by using and and is continuously run in the direction indicated by an arrow M in the figure, whereby the entire width of the base film 2 is obtained. Is evenly expanded, and the base film 2 is conveyed by using the guide rolls 3 and 4 together. Here, the winding angle φ indicates the angle at which the base film 2 is held by the transport roll 1 at the contact position a as shown in the figure.

Conveying roll 1 used in this embodiment
Is composed of a central shaft 11 which is the center of rotation and a rubber outer peripheral part 12 forming an outer peripheral part of the central shaft 11. This transport roll 1 has the center of the central axis 11 (in FIG. 4,
It is rotatably installed around (indicated by the broken line).

On the surface of the outer peripheral portion 12 of the transport roll 1, as shown in FIG.
A spiral multi-row groove 13 is formed symmetrically toward b and 12c. The multiple groove 13 has a predetermined inclination angle θ from the central portion 12a toward the end portions 12b and 12c as shown in FIG. 3, and the depth thereof is from the central portion 12a as shown in FIG. It is formed so as to gradually increase toward each of the end portions 12b and 12c (this state is shown by a dashed line in the figure).

Here, the multiple grooves 13 formed at equal pitches
4, the groove width W, the blade width T, the groove depth D (central portion D1, both end portions D2), the inclination angle θ, the number of threads n, the rubber hardness G (JIS- (A type rubber hardness meter) is W = 0.5 to 10 mm, T = 1, respectively.
-10 mm, D1 = 1-10 mm, D2 = D1 + (1-
20 mm), θ = 10 ° to 50 °, n ≧ 2 rows, G = 20
˜50 degrees, more preferably W = 1 to 3 mm, T =
2-5 mm, D1 = 2-5 mm, D2 = D1 + (1-1
0 mm), θ = 30 ° to 50 °, n ≧ 4 rows, G = 30 to
It is 40 degrees. The material of the outer peripheral portion 12 in which the multiple grooves 13 are formed is ethylene propylene pyrene terpolymer rubber (EPT), acrylonitrile-butadiene copolymer (NBR), isobutylene-isoprene copolymer (I
IR), silicone rubber, etc.

In consideration of the above-mentioned conditions, the transport roll 1 was produced as follows. That is, the groove width W, the blade width T, the groove depth D (central portion D1, both end portions D2),
The inclination angle θ, the number of threads n, and the rubber hardness G are W = 2 m, respectively.
m, T = about 3 mm, D1 = 3 mm, D2 = 5 mm, θ =
30 °, n = 6 lines (1 line lead length L = 30 mm),
G = 30 degrees, the roll length of the transport roll 1 is 700 m
m, the roll diameter is 80 mm, and the thickness of the outer peripheral portion 12 is 15 mm
As a result, ball bearings are provided at both ends of the central shaft 11 to provide a passive rotation type.

An experiment in which several types of base films 2 having different thicknesses were run by using the transport roll 1 thus manufactured as the transport means was tried. Here, the material of the base film 2 is polyethylene terephthalate (PET), and the thickness thereof is 5, 7, 10,
The thing of 14 micrometers was used. In addition, the tension applied to each base film 2 in the above-mentioned conveying means is 10 (kg / 6).
20 mm width), the guide rolls 3 and 4 were placed as chromium pipes on an aluminum pipe and were spaced 500 mm apart, and the transport roll 1 was further spaced 100 mm from this guide roll 3. Then, the wrapping angle φ of each base film with respect to the transport roll 1 was run in the range of 5 ° to 108 °.

As a result of the above experiment, wrinkles and the like did not occur on the guide rolls 3 and 4 with respect to all of the above four types of base films 2, and further, deformation did not occur between the guide rolls 3 and 4, and it was extremely excellent. Each base film 2
Was able to be transported. In particular, it has been shown that wrinkles and the like and deformation can be almost completely suppressed for the thin film having a thickness of 5 μm.

As described above, in the transport roll 1 according to the above-described embodiment, the central portion 1 is formed on the surface of the outer peripheral portion 12.
A spiral multi-slot 13 is provided symmetrically from 2a toward each end 12b, 12c. The multi-slot 13 has a predetermined inclination angle θ from the central portion 12a toward each end 12b, 12c. And the depth D of the multi-slot 13 is the central portion 12
The width is gradually increased from a toward each end 12b, 12c. Therefore, when the base film 2 which is a sheet-shaped substrate is supported by the transport roll 1 at a predetermined wrap angle φ and continuously run, the multiple grooves 13 are formed in a spiral shape, and thus the transport is performed. Roll 1
Tension is uniformly applied to the entire base film 2 without being localized. At this time,
The multiple groove 13 extends from the central portion 12a to the end portions 12b, 12
Since the tape has a structure having an inclination angle θ and a depth D that gradually increases toward c, the tension from the transport roll 1 is applied to the central portion 12a of the base film 2 with respect to the base film 2.
To the respective end portions 12b and 12c, the wrinkles and the like that tend to occur on the base film 2 during running are almost completely suppressed.

Therefore, when the carrying roll 1 of this embodiment is used, the base film 2 is carried in a substantially completely flat state without irregularities which are likely to occur on the surface of the base film 2. Uniform coating is realized without causing coating unevenness at the time of coating, and product yield and reliability are significantly improved.

[0025]

Conveying roll according to the present invention is a sheet substrate having flexibility and support at a predetermined winding angle is intended to continuously running, the outer circumference of the central axis, before
Uniform across the entire width of the central axis from one end to the other
A rubber-made outer peripheral portion having a thickness is formed, and a spiral multi-thread groove of equal pitch is formed symmetrically from the central portion to both end portions on the surface of the outer peripheral portion. A tilt angle of 10 ° to 50 ° from the center to both ends
Moreover , since the depth of the multi-slot is gradually increased from the central part toward both ends, it is evenly spread over the entire sheet-shaped substrate, and wrinkles and the like are almost completely suppressed. As a result, it is possible to significantly improve the yield and reliability of products using the sheet-shaped substrate.

[Brief description of drawings]

FIG. 1 is a schematic diagram showing a configuration of a transfer device.

FIG. 2 is a front view schematically showing the vicinity of a carrying roll according to the present embodiment.

FIG. 3 is a cross-sectional view schematically showing the transport roll.

FIG. 4 is a cross-sectional view schematically showing a part of the outer peripheral portion of the transport roll.

[Simple explanation of symbols]

1 Transport roll 2 base film 3,4 guide roll 11 central axis 12 Outer periphery 12a central part 12b, 12c each end 13 Multi-slot

─────────────────────────────────────────────────── ─── Continuation of the front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) B65H 23/025 B65H 27/00

Claims (3)

(57) [Claims] 1. A conveyance roll for supporting a flexible sheet-shaped substrate at a predetermined wrapping angle and continuously running it , on the outer periphery of a central shaft, from one end side to the other end side of the central shaft.
Formed rubber outer circumference with uniform thickness over the entire width
Is, on the surface of the outer peripheral portion, the multi-grooves of equal pitch spiral from the central portion symmetrically toward both end portions are formed, the multi-groove is the direction from the central portion to the both ends direction 10 ° ~
Has a 50 ° tilt angle, and depth of the multi-groove is being gradually larger toward the both end portions from the central portion
Conveying rolls, characterized in that that. 2. The transport roll according to claim 1, wherein the sheet-shaped substrate is a base film of a magnetic recording medium. 3. A method of manufacturing a magnetic recording medium, which comprises transporting a base film by the transport roll according to claim 1, and coating and forming a magnetic layer on the surface of the base film.