JPH04111224A - Production of magnetic recording medium - Google Patents

Abstract

PURPOSE:To improve production efficiency by slitting a raw sheet on which a magnetic layer is formed into plural tapes of specified width, polishing each tape, subjecting the tape to tension compensation process and then winding the tape on a reel. CONSTITUTION:The raw sheet 4 released from a unwinding drum 6 is guided through a guide roll 24 to slitting stage part 8, where the sheet is slitted into tapes 4A of specified width. In the slitting stage 8, the sheet 4 is required to have specified tension for each tape 4A, but the tension is decreased by a polishing device 10. The reduced tension is compensated by a tension compensator 12 to give uniform tension for each tape 4A. The tape 4A obtained by slitting is polished in the polishing device 10 to smoothen the surface of the magnetic layer. After polishing, each tape 4A is provided with specified tension by a tension roll 18 of the tension compensator 12 and wound up on a respective reel 14 by a reel holder 15. Thereby, the production efficiency of the magnetic recording tape can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method of manufacturing a magnetic recording medium such as a recording tape.

[Conventional technology]

Generally, in a method of manufacturing magnetic recording media such as video recording and recording tapes, a raw material on which a magnetic layer is formed is slit into a plurality of tapes using a slitting device, and each tape after the slitting is wound onto a reel.

Thereafter, each tape is taken out one by one from each reel and the magnetic layer on the surface of each tape is polished.

[Problems to be Solved by the Invention] However, as described above, polishing the tape for each reel after winding is cumbersome and there is a problem that production efficiency cannot be improved.

From this point of view, it is conceivable to polish each tape before winding it onto a reel in a series of magnetic recording medium manufacturing processes, for example.

However, if a polishing device (polishing process) is simply placed between the slitting process and the winding process, tension is applied to the tape by winding in the winding process, and the tension is reduced by the polishing device. As a result, sufficient tension cannot be obtained in the slitting process, and as a result, the running of the tape becomes unstable. For example, if the tension per tape in the winding process is about 50g/afi, the tension between the polishing process and the winding process is about 40g/ct, and the tension between the polishing process and the slitting process is about 10g/c+fl. Therefore, there is a problem that satisfactory slitting and stable tape running cannot be achieved with this level of tension.

On the other hand, generally, the length of the original fabric on which the magnetic layer is formed is not necessarily the same in the middle direction, and it is not homogeneous.
If a constant tension is applied only through the winding process, it is not possible to apply a uniform tension to each slit tape. If the tension is uneven in this way, satisfactory slitting and stable running cannot be achieved.

Therefore, an object of the present invention is to make it possible to incorporate a polishing process into a series of manufacturing processes for magnetic recording media, from the raw material on which a magnetic layer is formed to the winding of a tape, thereby improving production efficiency. An object of the present invention is to provide a method for manufacturing a magnetic recording medium that can be manufactured by using a magnetic recording medium.

[Means for Solving the Problems] The present invention includes a slitting process for slitting a raw material of a recording medium on which a magnetic layer is formed into tape shapes, and a winding process for winding the tape slit in the slitting process onto a reel. A method for manufacturing a magnetic recording medium in which a raw material is slit and wound as a tape, the method comprising: a polishing step of polishing the surface of the magnetic layer of the slit tape between the slitting step and the winding step; The above object has been achieved by providing a method for manufacturing a magnetic recording medium, which comprises a tension compensation step of independently applying a predetermined tension to each slit tape.

[Effect]

According to the method for manufacturing a magnetic recording medium of the present invention, a raw material on which a magnetic layer is formed is slit into a plurality of tapes of a predetermined width, each tape is subsequently polished in a polishing process, and then subjected to a tension compensation process. It is wound onto a reel in the winding process. In the polishing process, sufficient tension is applied to each tape by the tension compensation means, so even if the tension of the tape is taken away in the polishing process, the tension necessary for the slitting process can be obtained.

That is, it is possible to polish the tape before winding the reel.

Furthermore, since tension is applied to each tape in the tension compensation process, a certain constant tension required for each tape can be applied in the polishing process and the slitting process.

(Example) A preferred apparatus used for carrying out the present invention will be described in detail below with reference to the accompanying drawings.

As shown in FIGS. 1 and 2, the recording medium manufacturing apparatus 2 according to the present invention includes a raw material 4 having a magnetic layer formed on its surface.
unwinding drum 6 on which is wound, a slit section 8 that cuts the original fabric 4 into tapes of a predetermined width, a polishing device 10 that polishes the cut tape 4A, and a tension compensator that applies a predetermined tension to each tape. 12. Winding devices W16 for winding each tape 4A onto the reel 14 are provided in this order along the conveyance path.

In the slit section 8, the original fabric 4 is placed about 1 in the direction along the conveyance direction.
Slitter 8 for cutting into 00 or more tapes 4A
a and 8b are provided above and below the conveyance path with the original fabric 4 in between.

The polishing device 10 polishes each tape at the same time, and uses a known device such as a fine-mesh polishing tape or a polishing blade.

The tension compensator 12 is provided with a tension roll 18 that applies tension to each tape and two 7' rolls 20 that hold the tape 4A on the tension roll 18. Chi 1 on common axis 22
The same number as 4A is provided. The tension rolls 18 independently adjust the running speeds of the tapes 4A, so that a constant tension is applied to all the tapes 4A.

Note that the nip roll 20 is for holding the tape 4A on the tension roll 18, so if there is no slippage of the tape on the tension roll (for example, this may be achieved by increasing the holding angle of the tape on the tension roll). ) can also be made unnecessary.

The winding device 16 includes a reel holder 15 and a reel 14 attached to the reel holder 15, and applies a predetermined tension to each tape 4A when winding the tape onto the reel 14, but reduces the tightness of the tape. In order to do this, winding is performed using Taber tension.

Note that in FIGS. 1 and 2, reference numerals 24 and 26 indicate guide rollers that guide the conveyance of the original fabric 4 or tape 4A.

Next, an embodiment of the manufacturing method of the present invention using the above-mentioned apparatus will be described.

The raw fabric 4 pulled out from the unwinding drum 6 passes through the guide roll 24 and reaches the slit section 8, where it is slit into a tape 4A of a predetermined width. At this time, in the slitting section 8, a predetermined tension is required on the original fabric 4 or the tape 4A in order to smoothly perform the slitting. It is applied uniformly to each tape 4A. Therefore, since a constant tension is always applied to the slit portion 8, a reliable slit can be made and the tape can run stably.

The slitted tape 4A is polished by a polishing device 10, and the magnetic layer on the surface is polished smooth. In polishing with a force of 1, a relatively large tension is required, but a tension compensation device 12, which will be described later, applies the necessary tension to each tape 4A.

A predetermined tension is applied to each tape 4A after polishing by the tension roll 18 of the tension compensator 12.

The tapes 4i that have passed through the tension compensator 12 are respectively wound onto reels 14 by reel holders 15.

According to the embodiment described above, since different tensions can be applied to each tape 4A, each tape 4A can be polished uniformly, and the original fabric 4 can be smoothly knotted.

Furthermore, it is possible to polish the tape 4A in the magnetic recording medium production line from the slitting of the raw material to the winding of the tape 4A, thereby improving the production efficiency of the magnetic recording tape.

The present invention is not limited to the one embodiment described above, and can be modified in various ways without departing from the gist of the invention.

For example, in implementation B mentioned above, the polishing process and the tension compensation process were provided in this order after the slitting process, but the same effect is not limited to this. Even if the polishing process is provided after the tension compensation process, the same effect can be obtained. Obtainable.

〔Effect of the invention〕

According to the method for manufacturing a magnetic recording medium of the present invention, it is possible to incorporate a polishing process into a series of manufacturing processes of a magnetic recording medium, from the raw material on which the magnetic layer is formed to the winding of the tape, thereby improving production efficiency. You can improve your skills.

[Brief explanation of drawings]

FIG. 1 is a schematic configuration diagram showing a magnetic recording medium manufacturing apparatus used for carrying out the present invention, and FIG. 2 is a perspective view showing a schematic configuration of a tension compensation device and a winding device shown in FIG. 1. . 2; Magnetic recording medium manufacturing device 4; Original 4Ai tape (magnetic recording medium) 8; Slit section (slitting process) 10; Polishing device (polishing process) 12; Tension compensation device (tension compensation process) 16; Winding device (winding process)

Claims (1)

[Claims] A raw material comprising a slitting step of slitting the raw material of a recording medium on which a magnetic layer is formed into a tape shape, and a winding step of winding the tape slit in the slitting step onto a reel. A method for manufacturing a magnetic recording medium in which a magnetic recording medium is slit and wound as a tape, and between the slitting step and the winding step, a polishing step of polishing the surface of the magnetic layer of the slit tape, and a polishing step of polishing the magnetic layer surface of each slit tape. 1. A method for manufacturing a magnetic recording medium, comprising a tension compensation step of independently applying a predetermined tension to each.