JPH11185250A - Roll cleaning device of calender device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the productivity of a calender treatment by surely remov ing stains on the surfaces of calender rolls. SOLUTION: The calender device which smoothes the surface of the magnetic layer of a magnetic recording medium by passing this medium between plural calender rolls 11A, etc., has a roll cleaning device 20. This roll cleaning device 20 presses wiping cloth 24 which is delivered from a wiping cloth delivering device 21 and is penetrated with a cleaning liquid by a cleaning liquid supplying device 22 to the calender rolls 11A, etc., by a wiping cloth pressing device 23.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a roll cleaning device for a calender device for smoothing the surface of a magnetic layer of a magnetic recording medium.

[0002]

2. Description of the Related Art In a manufacturing process of a magnetic recording medium, a calender device is used for applying a magnetic paint on a non-magnetic support and then smoothing the surface of the magnetic layer. The calender device has a plurality of calender rolls, i.e., metal rolls and elastic rolls, which are alternately arranged, and the magnetic layer side of the magnetic recording medium corresponds to the metal rolls. By feeding the magnetic recording medium while clamping the recording medium, the surface of the magnetic layer is smoothed.

However, in the calendar device, the surface of the metal roll or the elastic roll is stained with the continuation of the operation due to the separation of the binder, the hardener and the lubricant of the magnetic paint applied to the magnetic recording medium. Then, the dirt on the roll surface is transferred to a magnetic layer or the like of the magnetic recording medium, causing dropout of the magnetic recording medium, and impairing the recording / reproducing quality.

In order to remove dirt on the surface of a metal roll of a calender, a roll cleaning device has been proposed in which a cleaning tape is slid on the surface of the metal roll.

[0005]

However, the conventional roll cleaning apparatus merely slides the cleaning tape on the surface of the metal roll in a dry manner, and cannot reliably remove dirt from the roll surface. For this reason,
The production is interrupted every one to two hours, and dirt on the surface of the metal roll is wiped off manually, but the productivity is poor.

SUMMARY OF THE INVENTION An object of the present invention is to reliably remove stains on the surface of a calender roll and to improve the productivity of calendering.

[0007]

According to the present invention, there is provided a roll cleaning device for a calender device for smoothing the surface of a magnetic layer through a magnetic recording medium between a plurality of calender rolls. Wiping cloth for wiping the wiping cloth at a constant feed rate while maintaining a constant tension, a wiping cloth extracted from the wiping cloth extracting apparatus, and a cleaning liquid supplied so as to penetrate the wiping cloth. A cleaning liquid supply device capable of adjusting the supply amount, and a wiping cloth pressing the wiping cloth drawn out of the wiping cloth extracting device and impregnated with the cleaning liquid by the cleaning liquid supply device onto a calendar roll and adjusting the pressing load. And an apparatus.

The "constant" of "constant tension" and "constant feed speed" means a tension and a feed speed generated mechanically under a constant control. For example, it is effective not only when the feed speed is set to a constant value of 10 cm / min but also when the speed is changed from 5 to 15 cm / min by a controller. The same applies to the tension.

According to a second aspect of the present invention, in the first aspect of the present invention, the cleaning liquid supply device further includes a porous plate for leaching the cleaning liquid, and the porous plate is brought into contact with a wiping cloth. It is the one that made it at least.

According to a third aspect of the present invention, in the first or second aspect of the present invention, the cleaning liquid supply device further supplies a cleaning liquid supplied from a wiping cloth to a calender roll. Can be adjusted to an amount that volatilizes before reaching the magnetic recording medium nip portion of the roll.

The present invention described in claim 4 is the first to third aspects of the present invention.
In the present invention described in any one of the above, the feed speed of the wiping cloth is 3 to 60 cm / min, and the pressing load is 5 to 7 kgf.

According to the present invention, the following effects are obtained. Use a fresh wiping cloth drawn out from the wiping cloth drawer at an appropriate feed rate, and use a wet wiping cloth impregnated with a cleaning liquid supplied at an appropriate supply amount adjusted by a cleaning liquid supply apparatus. In addition, by using the wiping cloth pressed against the calender roll with an appropriate pressing load adjusted by the wiping cloth pressing device, dirt on the surface of the calender roll can be reliably removed.

According to the second aspect of the present invention, the following operations are provided. The cleaning liquid supply device includes a porous plate that oozes out the cleaning liquid, and the cleaning liquid is evenly distributed over the entire wiping cloth by bringing the porous plate into contact with the wiping cloth, thereby removing dirt on the surface of the calender roll. Can be reliably removed in the whole area.

According to the third aspect of the present invention, the following operations are provided. The cleaning liquid supply device adjusts the cleaning liquid supply amount to an amount at which the cleaning liquid applied to the calender roll from the wiping cloth volatilizes before reaching the magnetic recording medium nip portion of the roll. As a result, the cleaning liquid applied to the calender roll dissipates immediately after working for removing dirt on the surface of the calender roll, and touches the magnetic recording medium at the nip portion of the calender roll to dissolve the magnetic paint. It does not involve such inconveniences.

[0015]

FIG. 1 is a schematic diagram showing a roll cleaning device, FIG. 2 is a schematic diagram showing a cleaning liquid supply device, and FIG. 3 is a schematic diagram showing a calender device.

The calendar device 10, as shown in FIG.
For example, three metal rolls 11A to 11C and two elastic rolls 12A and 12B are alternately arranged in parallel, and adjacent metal rolls 11A and 12A, elastic rolls 12A and 11B, and metal rolls 11B and Roll 12
B, nip portions 13A to 13D are formed between each of the elastic roll 12B and the metal roll 11C. The metal rolls 11A to 11C are, for example, chrome-plated on the surface of a steel roll, and the surfaces are mirror-finished. The elastic rolls 12A and 12B have cotton or the like on their surfaces. FIG. 4 shows a guide roll.

In the calendar device 10, the magnetic recording medium 1
In the state where the side of the magnetic layer of the magnetic recording medium 1 corresponds to the metal rolls 11A to 11C, the nip portions 13A to 13D of the metal rolls 11A to 11C and the elastic rolls 12A and 12B are separated.
By applying pressure and heat to the magnetic layer of the magnetic recording medium 1, the surface of the magnetic layer is smoothed.

However, in the calendar device 10,
As shown in FIG. 1, a roll cleaning device 20 is provided for each of the metal rolls 11A to 11C. In addition, the roll cleaning device 20 includes the elastic rolls 12A,
2B. Hereinafter, the roll cleaning device 20 provided on the metal roll 11A (the roll cleaning device 20 provided on another metal roll 11B or the like)
The same applies).

The roll cleaning device 20 includes a wiping cloth feeding device 21, a cleaning liquid supply device 22, and a wiping cloth pressing device 23.

The wiping cloth unwinding device 21 includes a winding reel 21A with a brake and a winding reel 21 with a winding motor.
B and a feed gear 21C. The wiping cloth reeling device 21 reels out the wiping cloth 24 for wiping the surface of the metal roll 11A at a constant feed speed while maintaining a constant tension. The feed gear 21C is composed of a pair of adjustment drive spur gears sandwiching the wiping cloth 24 and applies a feeding force to the wiping cloth 24.

The cleaning liquid supply device 22 includes a pump 2
2A and a supply head 22B. The cleaning liquid supply device 22 supplies the cleaning liquid to the wiping cloth 24 drawn from the wiping cloth drawing device 21 so as to penetrate the wiping cloth 24, and can adjust the supply amount by controlling the discharge amount of the pump 22A.

The wiping cloth pressing device 23 includes two pressing rolls 23A, 23A and the pressing rolls 23A, 23A.
23B, which presses the metal roll 11A against the metal roll 11A,
3B. The wiping cloth pressing device 23 winds the wiping cloth 24 that has been unwound from the unwinding reel 21A of the wiping cloth unwinding device 21 around the pressing rolls 23A, 23A, and regulates the unwinding path of the wiping cloth 24 around the metal roll 11A. The wiping cloth 24 impregnated with the cleaning liquid by the cleaning liquid supply device 22 is pressed against the metal roll 11A, and the pressing load is adjusted by controlling the pressure of the pressing device 23B.

At this time, as the wiping cloth 24, for example, "Zavina Minimax" (trade name) using ultra-fine fibers of Kanebo Co., Ltd. can be used. As the cleaning liquid, a solvent for cleaning, for example, methyl ethyl ketone can be used.

In the cleaning liquid supply device 22, the supply head 22B may include a porous plate 22C made of, for example, a fluororesin sintered body. The porous plate 22C comes into contact with the wiping cloth 24 backed up by the pressing roll 23A, and allows the cleaning liquid to ooze out toward the wiping cloth 24.

The cleaning liquid supply device 22 adjusts the cleaning liquid supply amount adjusted by controlling the discharge amount of the pump 22A to the cleaning roll applied to the metal roll 11A from the wiping cloth 24 by the elastic roll 12A of the metal roll 11A. It can be adjusted to an amount that volatilizes and dissipates before reaching the nip portion 13A.

The roll cleaning device 20 performs a cleaning operation as follows. (1) The fresh wiping cloth 24 is unwound from the unwinding reel 21A of the wiping cloth unwinding device 21, and the pressing rolls 23A, 23
A is wound around the metal roll 11A and is drawn out at a constant tension and a constant feed speed along a drawing path around the metal roll 11A.

(2) The cleaning liquid oozed from the porous plate 22C of the supply head 22B of the cleaning liquid supply device 22 is made to permeate the wiping cloth 24.
At this time, the supply amount of the cleaning liquid supplied to the wiping cloth 24 is determined by the amount of the cleaning liquid applied to the metal roll 11A from the wiping cloth 24 by the elastic roll 12A of the metal roll 11A.
Is adjusted to an amount that evaporates before reaching the nip portion 13A.

(3) The wiping cloth 24 impregnated with the cleaning liquid is pressed by the wiping cloth pressing device 23 onto the metal roll 11.
Press A. At this time, the pressing load is adjusted by the pressing device 23B.

Therefore, according to the present embodiment, the following operation is provided. The use of a fresh wiping cloth 24 which is drawn out from the wiping cloth drawing device 21 at an appropriate feed rate, and a wet wiping in which the cleaning liquid supplied at an appropriate supply amount adjusted by the cleaning liquid supply device 22 is infiltrated. The use of the cloth 24 and the use of the wiping cloth 24 pressed against the metal roll 11A or the like with an appropriate pressing load adjusted by the wiping cloth pressing device 23 can reliably remove stains on the surface of the metal roll 11A or the like.

The cleaning liquid supply device 22 is provided with a porous plate 22C for exuding the cleaning liquid, and by bringing the porous plate 22C into contact with the wiping cloth 24, the cleaning liquid is evenly distributed over the entire wiping cloth 24. Dirt on the surface of the metal roll 11A and the like can be reliably removed over the entire area.

The cleaning liquid supply unit 22 determines the amount of the cleaning liquid supplied by the cleaning liquid applied to the metal roll 11A from the wiping cloth 24 before the cleaning liquid reaches the nip portion 13A of the magnetic recording medium such as the roll 11A. Adjust to As a result, the cleaning liquid applied to the metal roll 11A or the like immediately dissipates immediately after working to remove dirt on the surface of the metal roll 11A or the like, and
A disadvantage such as dissolving the magnetic paint by touching the magnetic recording medium with the nip portion 13A of A or the like is not involved.

[0032]

Preferred values of the cleaning operation conditions of the roll cleaning device 20 provided in the above-described calender device 10 were as follows. (A) Feeding speed of the wiping cloth 24 A preferable value of the feeding speed of the wiping cloth 24 is 3 cm / min to 60 cm / min.
min, more preferably from 5 cm / min to 40 cm / min.

(B) Supply amount of cleaning liquid The preferred value of the shared amount (gf / min) when methyl ethyl ketone is used as the cleaning liquid is as shown in Table 1 with respect to the temperature of the roll of the metal roll 11A and the line speed of the magnetic recording medium 1. It was like.

[0034]

[Table 1]

(C) The pressing load of the wiping cloth 24 The preferable value of the pressing load of the wiping cloth 24 was 5 to 7 kgf.

The embodiment of the present invention has been described in detail with reference to the drawings. However, the specific configuration of the present invention is not limited to this embodiment, and the design can be changed without departing from the scope of the present invention. The present invention is also included in the present invention.

[0037]

As described above, according to the present invention, dirt on the surface of the calender roll can be reliably removed, and the productivity of the calender treatment can be improved.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing a roll cleaning device.

FIG. 2 is a schematic diagram illustrating a cleaning liquid supply device.

FIG. 3 is a schematic diagram showing a calendar device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Magnetic recording medium 10 Calender device 11A-11C Metal roll (calender roll) 12A, 12B Elastic roll (calender roll) 13A-13D Nip part 20 Roll cleaning device 21 Wiping cloth drawing device 22 Cleaning liquid supply device 22C Porous plate 23 Wiping Cloth pressing device 24 Wiping cloth

Claims (4)

[Claims] 1. A roll cleaning device for a calender device for smoothing the surface of a magnetic layer through a magnetic recording medium between a plurality of calender rolls, wherein a wiping cloth for wiping the surface of the calender roll is maintained at a constant tension. A wiping cloth tapping device that feeds the cleaning liquid at a constant feed speed, a cleaning liquid supply device that supplies a cleaning liquid permeating the wiping cloth drawn out from the wiping cloth feeding device, and that can adjust the supply amount thereof; A roll cleaning device for a calender device, comprising: a wiping cloth pressing device that presses a wiping cloth that has been drawn out of the apparatus and has been impregnated with a cleaning liquid by a cleaning liquid supply device, and that can adjust the pressing load. 2. The roll cleaning device according to claim 1, wherein the cleaning liquid supply device includes a porous plate that oozes the cleaning liquid, and the porous plate is brought into contact with a wiping cloth. 3. The cleaning liquid supply device is capable of adjusting a supply amount of the cleaning liquid to an amount at which the cleaning liquid applied to the calender roll from the wiping cloth volatilizes before reaching the magnetic recording medium nip portion of the roll. Claim 1
Or a roll cleaning device of the calender device according to 2. 4. The feeding speed of the wiping cloth is 3 to 60 cm / min,
4. The roll cleaning device for a calendar device according to claim 1, wherein the pressing load is 5 to 7 kgf.