Open-and-close device made of aluminium alloy plate for recording medium shell

Abstract

This invention provides an aluminum alloy sheet for a recording medium case shutter which satisfies all the characteristics.The shutter comprises following materials: aluminum alloy substrate, in which the aluminum alloy contains 2.2-2.8 mass % of Mg, 0.35-0.55 mass % of Mn and 0.1-0.4 mass % of Fe; on a surface which is the shutter outer surface side of an aluminum alloy substrate, a chromate film of 5 to 50 mg / m<2> in terms of chromium coating weight is formed as a first layer, and a acrylate modified polyester urethane based resin coating film is formed as a second layer on the surface of the shutter outer surface side; the synthetic resin coating film contains an acrylate modified polyester urethane based resin, inorganic particles with an average particle size of 10 mum or less, and of 5 to 20 parts by weight based on 100 parts by weight of the acrylate modified polyester urethane based resin, and a polyethylene oxide based lubricant of 0.5 to 3 parts by weight based on 100 parts by weight of the acrylate modified polyester urethane based resin. The synthetic resin coating film is formed with a film thickness of 0.5 to 3 mum.

Description

technical field [0001] The present invention relates to a shutter provided in a housing for storing recording media such as magnetic disks such as floppy disks, optical disks such as MO magnetic disks, and compact disks. In particular, it relates to a switch using an aluminum alloy plate that fully satisfies the characteristics of light weight, rigidity, flaw resistance, punching workability, bending workability, solvent resistance, and UV-curable ink printability. Background technique [0002] In magnetic disks such as floppy disks (floppy disks), optical disks such as MO disks and minidisks, etc., such as figure 1 As an example of a flexible disk shown in , a recording medium 3 such as a magnetic disk or an optical disk (disk for recording) on ​​which information is recorded is housed in a casing 2 made of synthetic resin. In addition, when writing or reading information, a magnetic head or an optical head is brought close to the recording medium 3 in the housing 2 to rea...

AI Technical Summary

Problems solved by technology

[0007] However, even though these prior arts of the present applicant have properties such as light weight and rigidity required as an aluminum alloy plate for a switch, it cannot be said that they fully satisfy the flaw resistance, punching workability and All characteristics of processability such as bending workability, solvent resistance, and printability of UV-curable inks are expected to be further improved.

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