Magnetic tape and method for producing the same

Patent metadata

Field	Value
Publication number	US-9443546-B2
Application number	US-201414147339-A
Country	US
Kind code	B2
Filing date	Jan 3, 2014
Priority date	Aug 5, 2008
Publication date	Sep 13, 2016
Grant date	Sep 13, 2016

Abstract

A magnetic tape produced by cutting a magnetic sheet with a wide breadth into a tape having a predetermined width using a cutting device, in which the magnetic sheet has a magnetic layer containing magnetic powder and a hinder formed on one surface of a non-magnetic substrate having a thickness of 4 μm or less, and a center line average height (Ra) along a roughness curve of a cut edge of the magnetic tape is from 0.08 to 0.25 μm.

First claim

What is claimed is:

1. A magnetic tape having an entire thickness of from 2 μm to 8 μm produced by cutting a magnetic sheet with a wide breadth into a tape with a predetermined width using a cutting device, wherein the magnetic sheet comprises a magnetic layer with a thickness of 10 to 300 nm containing magnetic powder and a binder formed on one surface of a non-magnetic substrate, and a primer layer comprising inorganic powder and a binder having a thickness of 0.1 μm to 3.0 μm between said magnetic layer and said non-magnetic substrate, and wherein a center line average height (Ra) along a roughness curve of a cut edge of the magnetic tape in a thickness direction is from 0.09 to 0.23 μm.

2. The magnetic tape according to claim 1 , wherein the center line average height (Ra) along a roughness curve of a cut edge of the magnetic tape in a thickness direction is from 0.09 to 0.12 μm.

3. The magnetic tape according to claim 1 , wherein said binder of said primer layer contains an electron radiation curing resin.

4. The magnetic tape according to claim 1 , wherein a friction coefficient between a cut edge of the magnetic tape and a flange portion of a guide roller is from 0.18 to 0.31.

Assignees

• Hitachi Maxell

Inventors

• Inoue Tetsutaro

Classifications

• Y10T83/0605

  Cut advances across work surface · CPC title

• Y10T83/0419

  By distorting within elastic limit · CPC title

• G11B5/70

  on a base layer · CPC title

• B26D2001/0033

  assembled from multiple blades · CPC title

• B26D1/245

  for thin material, e.g. for sheets, strips or the like · CPC title