JPS6116586B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of manufacturing a magnetic recording disk for a magnetic device, and particularly to an improvement in a cleaning treatment method in a surface finishing process.

In order to adjust the film thickness and improve the surface roughness, the magnetic coating surface of magnetic recording disks such as magnetic disks and disk packs is sequentially wrapped with an abrasive tape made by coating Mylar tape with fine abrasive grains. However, if the wrapping is finished only, wrapping gas (exfoliated magnetic powder, abrasive grains, crushed pieces of cured resin, surface layer altered by processing, etc.) remains on the finished surface, and the wrapping gas If the magnetic head is not sufficiently removed, when used as a combination device with a magnetic head, the magnetic head becomes dirty and the flying ability deteriorates, which may eventually lead to head crash. To deal with this problem, conventional wrapping gas removal processes include ethyl alcohol,
A treatment method in which a chemical cleaning treatment is applied, such as cleaning the wrapping surface by soaking paper or gauze with an organic solvent such as isopropyl alcohol, and then applying a burnishing treatment to give the surface a super finish. was taken.

However, the solvents used in the cleaning process are subject to the Organic Solvent Poisoning Prevention Regulations under the Safety and Health Act and hazardous materials under the Fire Service Act, so there are special considerations such as consideration of extreme exhaust systems and management of permissible air concentrations in work rooms. It is necessary to take safety, health, and disaster prevention measures such as the selection of personnel, and the organic solvent has the drawback that it is not suitable for use in high-precision, high-density, and small-scale operations such as the cleaning process.

In view of the above problems, it is an object of the present invention to provide a cleaning method for effectively removing the wrapping of the magnetic coating film on a recording disk without using an organic solvent. A surface finishing process for magnetic recording disks, in which a magnetic paint made of magnetic powder, a thermosetting resin, and an organic solvent is applied to a substrate and subjected to a thermosetting treatment, and the coated film surface is sequentially subjected to a wrapping treatment, a cleaning treatment, and a burnishing treatment. In the cleaning process, a predetermined polishing cloth made of an organic fiber structure is poured with a large amount of water on the surface of the disc rotated at a predetermined speed, and the contact portion of the polishing cloth with the disc is renewed. It is characterized by being made by a method that involves pressure contact with the user.

Furthermore, conventionally, in cleaning after surface wrapping, chemical dissolution using an organic solvent was required in order to remove the process-altered layer where the polymer chains of the synthetic resin were cut midway, and in fact water was used. Even when soaked in paper or gauze and wiped, there was no cleaning effect.However, when a certain type of organic fiber tape was applied to the wrapping surface while applying pressure and rubbing with a large amount of water, some residue remained on the surface. It was experimentally confirmed that the organic fiber layer retains the magnetic powder and mechanically removes the process-altered layer, as the color of the washing water residue changed from reddish brown to colorless. It was applied.

Next, embodiments of the present invention will be described in detail with reference to the drawings. The figure is a schematic diagram showing an example of a method for cleaning a wrapping-finished magnetic recording disk, in which 1 is a magnetic recording disk, 2 is a spinner, 3 is a cleaning water nozzle, 4 is a rolled abrasive cloth tape, Reference numeral 5 indicates a rubber roll for pressure contact, and reference numerals 6 and 7 indicate a winding reel and a delivery reel for the finishing tape.

In the figure, reference numeral 2 denotes a spinner equipped with a control device (not shown) and consisting of a vertical rotating shaft 21 protruding from a watertight bearing at the bottom of a drainage pit (not shown) and a horizontal rotating disk 22, and a magnetic spinner placed on the rotating disk 22. A nozzle 3 with a stop valve 31 for supplying cleaning water to the coated surface 11 of the recording disk 1 is provided. Further, a roll-shaped abrasive cloth tape 4 made of a predetermined organic fiber drawn out from the feed reel 7 is wound at a low speed while being pressed against the coating surface rotating at high speed by a rotatable pressure-contacting rubber roll 5 at a predetermined pressure. It is configured to be wound onto a take-up reel 6.

The polishing cloth applied to the present invention is a so-called commercially available polishing cloth made of organic fibers, and may be selected from the following molded products.

#101 Abrasive cloth (Felt, manufactured by Marumoto Kogyo) #102〃 (Rashiya〃) #502〃 (Synthetic fiber) Felt A method of forming the polishing cloth into a roll and feeding it with a reel was adopted, but in another embodiment (not shown), the polishing cloth is pasted on a circular part and pressed against the coating film, and the polishing cloth part can be replaced frequently. It may be configured like this.

According to the wrapping gas cleaning method for the coated surface of a magnetic recording disk described above, the equipment is extremely simple and does not require the use of organic solvents, which are classified as hazardous materials under the Fire Service Act or are subject to the Organic Solvent Poisoning Prevention Regulations under the Safety and Health Act. Since it can be washed using ordinary materials, it is effective in improving work safety and health and disaster prevention.

[Brief explanation of the drawing]

The figure shows a schematic diagram illustrating a method for cleaning a magnetic recording disk according to an embodiment of the present invention. In the figure, 1 is a magnetic recording disk, 2 is a spinner, 3 is a cleaning water nozzle, 4 is a polishing cloth tape, 5 is a rubber roll for pressure contact, 6 is a take-up reel, and 7 is a delivery reel.

Claims (1)

[Claims] 1. A magnetic recording disk in which a magnetic paint made of magnetic powder, a thermosetting resin, and an organic solvent is coated on a disk-shaped substrate, and the coated film surface is subjected to a wrapping treatment, a cleaning treatment, and a burnishing treatment in sequence. In the surface finishing method, the cleaning process includes a predetermined polishing cloth made of an organic fiber tissue that is pulled out from a delivery reel and wound onto a take-up reel while flowing water on the surface of the disc rotated at a predetermined speed. A method for finishing the surface of a magnetic recording disk, characterized in that the polishing cloth is pressed against the surface of the disk using a rotatable pressure rubber roll, and pressure cleaning is carried out while renewing the contact area of the polishing cloth with the disk.