JPH05124761A - Guide roller device - Google Patents

Abstract

PURPOSE:To provide a guide roller device by which a non-magnetic carrier body can be guided with excellent travelling performance by filling a material having a different friction coefficient from the roller in grooves of a roller where the spiral grooves are formed on the surface, and turning the spiral directions of the spiral grooves oppositely to each other with the shaft directional central part of the roller as the boundary. CONSTITUTION:In order to run a non-magnetic carrier body 3 stably when traveling at high speed as well as to maintain excellently the surface property of the non-magnetic carrier body 3, a roller which is composed of a roller 16 where spiral grooves 15 are formed on the surface and in which a material 17 having a friction coefficient different from that of the roller 16 is filled in the grooves 15, is used as a guide roller 14. As a result, slip shift or wrinkle formation of the non-magnetic carrier body induced by an air film can be prevented, so that traveling stabilization of the non-magnetic carrier body 3 can be attained. In the case where the spiral grooves are formed so that the spiral directions can turn oppositely to each other with the shaft directional central part 18 as its boundary, a framing effect is added to the non-magnetic carrier body 3, and excellent traveling performance can be also obtained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a guide roll installed for guiding a non-magnetic support in a coating device used for coating a magnetic coating, a back coat coating, etc. on the non-magnetic support. Regarding the device.

[0002]

2. Description of the Related Art Generally, audio tapes and video tapes are coated with a magnetic paint prepared by dispersing and kneading a ferromagnetic powder, a binder, a dispersant, a lubricant, etc. in an organic solvent on a non-magnetic support such as a polyester film. By doing so, the magnetic layer is formed.

Coating these magnetic paints on a non-magnetic support,
The coating device for drying and forming the magnetic layer is a coating material coating step,
A coating device and a dryer are installed on the downstream side of the coating device so that the paint drying process is performed in this order, and a traveling system is provided for allowing the non-magnetic support to pass through these devices and continuously travel. The traveling system includes an unwinding roll for unwinding the non-magnetic support, a drive roll for driving the non-magnetic support, and a plurality of guide rolls for guiding the non-magnetic support to an appropriate position. And so on.

By the way, in such a coating apparatus, the running stability of the non-magnetic support is important for good film formation.

For example, in such a coating device,
As the factors that make the traveling of the non-magnetic support unstable, it is considered that the traveling resistance caused by the surface contact between the non-magnetic support and the guide roll, the air film generated by the rotation of the guide roll, etc. It depends on the guide roll. For this reason, conventionally, guide rolls have been devised to stabilize running in terms of material, shape, etc., for example, guide rolls made of steel with chrome plating on the surface or aluminum with alumite treatment, and The surface is provided with unevenness due to sandblast shots as shown in FIG. 6, spiral grooves as shown in FIG. 7, and kerfs such as cross spiral grooves as shown in FIG. 8 to reduce the resistance due to surface contact. A guide roll is used so that an escape path for the air film is formed.

[0006]

However, in recent years, in the above coating apparatus, it has been required to further increase the running speed of the non-magnetic support, and the guide roll has irregularities due to sandblast shots. It has become impossible to prevent running defects of the non-magnetic support simply by providing the kerfs.

For example, even when a guide roll having the above-mentioned groove is used, when the traveling speed of the non-magnetic support increases and the rotation of the guide roll increases, the air film stops moving and this air film does not move. The film is rolled up in the running direction of the non-magnetic support, which induces a slip shift (deviation in the width direction of the tape) and a fine linkle, which causes a running failure of the non-magnetic support. Further, in particular, when such a slip shift occurs in a guide roller equipped with an EPC (edge control device) for controlling the traveling of the non-magnetic support, the EPC guide roller follows the non-magnetic support. Is very important, the running of the non-magnetic support is greatly affected even with a slight slip shift, and the non-magnetic support meanders.

In addition, the guide roll having the groove on the surface may have a vacuum state inside the groove due to the running non-magnetic support sealing the groove portion. The magnetic support is in a state of being pressed against the groove, which causes a problem that the non-magnetic support itself and the coating film have marks of the groove.

Therefore, the present invention has been proposed in view of such a conventional situation, and guides the non-magnetic support with good traveling property even when the non-magnetic support is accelerated. An object of the present invention is to provide a guide roll device that can be used.

[0010]

In order to achieve the above object, the guide roll device of the present invention comprises a roll having a spiral groove formed on the surface thereof, and a friction coefficient with the roll is provided in the groove. It is characterized by being filled with different materials. Further, the spiral directions of the spiral groove are opposite to each other with the axial center of the roll as a boundary.

[0011]

The guide roll device of the present invention comprises a roll having a spiral groove formed on the surface thereof, and the groove is filled with a material having a friction coefficient different from that of the roll. With respect to the guide roll device having such a configuration, when the base cloth material is run,
The base cloth material exhibits stable running performance even at high speeds,
In addition, the surface property is maintained well. This is for the following reason.

That is, when the guide roll device is rotated by the traveling of the base cloth material, a material having a different friction coefficient from that of the roll filled in the groove is moved spirally in the axial direction. Thereby, the generation of the air film is effectively suppressed, and as a result, the slip shift and the linkel formation of the base fabric material induced by the air film are prevented, and the running property of the non-magnetic support is stably maintained.

Further, in the guide roll device, as described above, the inside of the groove is filled, and the surface is in a smooth state with no unevenness. Therefore, the surface properties of the running base fabric material are not adversely affected, and the surface properties of the base fabric material are maintained well.

Further, the spiral direction of the spiral groove is
When the rolls are opposite to each other with the central portion in the axial direction as a boundary, a material having a friction coefficient different from that of the guide roll moves spirally in both directions with respect to the axial direction. As shown in (4), a width-width effect is added to the non-magnetic support, and better running stability is achieved.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described with reference to the drawings. This embodiment is an example in which the guide roll device of the present invention is applied to a coating device used for coating a magnetic paint and a back coat paint when manufacturing a magnetic recording medium.

The above-mentioned coating apparatus coats a non-magnetic support with a magnetic paint, a back coat paint, etc., and dries it to form a magnetic layer,
The back coat layer is formed.

In the coating apparatus, the transfer apparatus 1 and the dryer 2 are installed downstream of the transfer apparatus 1 so that the coating transfer step and the coating film drying step are performed in this order, and the non-magnetic support 3 is also provided. A traveling system 4 for continuously traveling the vehicle is provided.

The transfer device 1 comprises a gravure roll 5 for transferring the paint onto the non-magnetic support and a backup roll 6 for pressing the non-magnetic support onto the surface of the gravure roll 5. In the transfer device, as the rolls rotate, the paint in the coating liquid pan 7 is picked up on the surface of the gravure roll 5, and the picked-up paint is transferred onto the non-magnetic support 3.

The running system is for passing the non-magnetic support 3 through the transfer device 1 and the dryer 2 and continuously running it. The traveling system includes an unwinding roll 8 for unwinding the non-magnetic support, a pre-feed driving roll 9 and an out-feed driving roll 10 for driving the non-magnetic support,
A winding roll 11 for winding the non-magnetic support 3 on which a magnetic layer or a back coat layer is formed, and a plurality of guide rolls 1 for guiding the non-magnetic support to appropriate positions.
It consists of 4.

Here, in the above coating apparatus, in order to make the non-magnetic support 3 stably run even at high speeds and to maintain the surface property of the non-magnetic support 3 well, the guide roll 14 is As shown in FIGS. 2 and 3, a roll 16 having a spiral groove 15 formed on the surface thereof, and a material 17 having a friction coefficient different from that of the roll 16 is filled in the groove 15 is used.

That is, the guide roll 14 having the above structure
When the non-magnetic support 3 rotates as the non-magnetic support 3 travels, the groove 15
A material 17 having a friction coefficient different from that of the roll 16 filled inside moves spirally in the axial direction. By this,
The generation of an air film caused by the rotation of the guide rolls 14 is effectively suppressed, and as a result, slip shift and linkel formation of the non-magnetic support induced by the air film are prevented, and the non-magnetic support is prevented. The traveling stabilization of 3 will be achieved.

The guide roll 14 is filled with the grooves 15 unlike the conventional guide roll in which grooves are formed on the surface as unevenness, and the surface is smooth without unevenness. Therefore, the surface property of the traveling non-magnetic support 3 is not adversely affected, and the surface property of the non-magnetic support is favorably maintained. Moreover, if the surface is not uneven as described above, the accumulation of dust and the like is eliminated, so that dropouts and the like caused by adhered substances are prevented and cleaning is easy.

Roll 1 constituting the guide roll 14
The material of No. 5 is steel, aluminum, etc.
In addition to the roll material used in the guide roll,
A rubber material can also be used.

A spiral groove 15 is formed on the surface of the roll 16, and the groove 15 is formed as shown in FIG.
When the spirals are formed so as to be opposite to each other with the axial center portion 18 of the roll 16 as a boundary, as shown in FIG. 5, the material filled in the groove by the rotation of the guide roll is axially moved. On the other hand, since it moves spirally in both directions (a direction and b direction in the figure), a width-width effect is added to the non-magnetic support body 3, and the non-magnetic support body 3 travels with better traveling performance. Will be done.

In the spiral groove 15, the inclination angle α with respect to the roll axis direction is preferably 30 ° to 60 °, and the number of threads is preferably set in consideration of the diameter of the guide roll. Usually, the number is 6 to 10. Further, the groove 15 is formed as, for example, a rectangular parallelepiped concave portion, in which case it is preferable that the depth T is 2 to 3 mm and the width W is 6 to 10 mm. These conditions are set from the viewpoint of effectively preventing the air film. If the inclination angle α of the groove is set according to the holding angle of the non-magnetic support 3 of the guide roll 14, it is possible to obtain better running stability.

The material 17 to be filled in the groove 15 may be any material as long as it has a friction coefficient different from that of the roll. For example, acrylonitrile butadiene rubber (NB
R), ethylene propylene copolymer (EPT), and rubber materials such as silicone rubber. A wide variety of applications can be achieved by selecting these materials in various ways. In the guide roll, the material 17
If the surface is polished after filling the groove into the groove, a better surface property can be obtained, which is advantageous in maintaining the surface condition of the running base cloth.

Next, in order to investigate the traveling stabilization of the non-magnetic support by using the above guide roll, the guide roll of the present invention (Samples 1 to 3) and the conventional guide rolls (Comparative Samples 1 to 1). Comparative sample 6)
Was applied to the above coating apparatus, and the occurrence of slip shift and linkel formation of the running non-magnetic support was observed.
The results are shown in Table 1.

The material of the sample guide roll [aluminum (surface roughness Rz 0.5 μm, steel), the state of the groove formed on the surface, the material filled inside the groove [silicon rubber (surface roughness Rz 7 μm), EPT
(Surface roughness Rz 4 μm)], the hardness of the material, and the peripheral speed of the roll are shown in Table 1. The run non-magnetic support was a PET film, and the film thickness thereof is also shown in Table 1.

Further, in the table, the evaluation of the running property is expressed as ◯ when the shift or linkel does not occur, Δ when the shift or the linkel sometimes occurs, and x when the occurrence frequency is high.

[0030]

[Table 1]

As can be seen from Table 1, Comparative Samples 1 to 1
When the comparative sample 6 is used, the non-magnetic support is slip-shifted during traveling, and linkel is formed on the non-magnetic support, so that good traveling stability cannot be obtained. On the other hand, Sample 1 to Sample 3
In the case of using, the non-magnetic support runs stably without causing slip shift or linkel formation.

Therefore, from these results, it was found that the use of the guide roll of the present invention is effective for stabilizing the running of the non-magnetic support, and enables high-speed film formation of the coating apparatus. ..

[0033]

As is apparent from the above description, the guide roll device of the present invention comprises a roll having a spiral groove formed on the surface thereof, and a material having a friction coefficient different from that of the roll in the groove. Since it is filled with, it is possible to improve the running property of the guided base fabric material during high speed running, and it is possible to maintain good surface properties. Further, if the spiral directions of the spiral grooves are opposite to each other with the central portion in the axial direction of the roll as a boundary, the running property of the base cloth material can be further improved.

Therefore, if the guide roll of the present invention is applied to, for example, a coating apparatus, the high speed running of the non-magnetic support can be achieved and the film forming efficiency can be improved.

[0035]

[Brief description of drawings]

FIG. 1 is a schematic diagram showing a configuration of a coating device to which a guide roll device of the present invention is applied.

FIG. 2 is a plan view showing an example of a guide roll device of the present invention.

FIG. 3 is a schematic sectional view of an essential part showing an example of the shape of a groove formed in the guide roll device of the present invention.

FIG. 4 is a schematic plan view of an essential part showing an example of a groove formed in the guide roll device of the present invention.

FIG. 5 is a schematic perspective view showing a width-extending effect exhibited in the guide roll device.

FIG. 6 is a plan view showing an example of a conventional guide roll device.

FIG. 7 is a plan view showing another example of a conventional guide roll device.

FIG. 8 is a plan view showing still another example of a conventional guide roll device.

[Explanation of symbols]

 14 ... Guide roll 15 ... Spiral groove 17 ... Material having different friction coefficient from that of roll

Claims (2)

[Claims] 1. A guide roll device comprising a roll having a spiral groove formed on the surface thereof, and a material having a friction coefficient different from that of the roll is filled in the groove. 2. The guide roll device according to claim 1, wherein the spiral directions of the spiral grooves are opposite to each other with a central portion in the axial direction of the roll as a boundary.