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Manufacturing method of tape-form recording medium

a tape-form recording and manufacturing method technology, applied in the manufacture of record carriers and packaging, etc., can solve the problems of quality of tape-form recording media, and achieve the effect of effective recovery of concavity and easy recovery of concavity

Inactive Publication Date: 2006-12-28
FUJIFILM HLDG CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0013] Meanwhile, the raw web rewinding process is done in order to make a storage and a heat treatment (strain relief) thereafter easily performed.
[0014] Here, because a surface pressure is stronger at a portion near a core of a bulk roll than at a portion near a surface thereof, a concavity on a surface of a data recording layer becomes larger (deeper) at the former portion than at the latter. On the other hand, if raw web once wound is rewound, the raw web wound near the core of the bulk roll in firstly being wound results in moving near the surface of the bulk roll. Therefore, the surface pressure applied to the larger portion in concavity becomes less, and thus it is enabled to effectively recover the concavity. Meanwhile, with respect to the raw web wound near the surface of the bulk roll, because the concavity is originally smaller and further a tension when rewound lessens, it is enabled to recover the concavity. In addition, because positions of a minute convexity and the concavity are displaced by being rewound, it becomes easier for the concavity to recover.
[0019] In accordance with such the method, because a strain of raw web, for example, such a strain of a substrate is relieved by drying a coated data recording layer, it is enabled to improve a quality of the tape-form recoding medium. In order to relieve the strain of the raw web, it is effective to leave the raw web for a predetermined time under a high temperature environment. At this time, although because the raw web is warmed and tends to be deformed, the minute convexity of the back coat layer is pushed to the surface of the data recording layer and a concavity tends to be formed; however, because the concavity can be recovered by the raw web rewinding process and the raw web heating process, the quality of the tape-form recoding medium does not lower.
[0022] In accordance with such the method, because wide raw web is slit and then is rewound, it is enabled to narrow a width of the raw web in the raw web heating process. Therefore, a heating effect results in early and uniformly reaching till a middle portion in width directions of the raw web, and thus it is enabled to effectively recover a concavity on a surface of a data recording layer.

Problems solved by technology

Then, if leaving the magnetic tape bulk roll for a long time in the state and / or heating it, there is a problem that a minute concavity results in being formed on the surface of the magnetic layer.
If there exists a concavity on a surface of a data recording layer of a tape-form recoding medium represented by such the magnetic tape described above, an occurrence frequency of a dropout (signal dropout) in reading / writing data increases, and thereby a quality of the tape-form recoding medium results in lowering.
In addition, because as a track width narrows, an influence of such the concavity becomes larger, it is a large obstacle in increasing a recording capacity (recording density) of the tape-form recoding medium.

Method used

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  • Manufacturing method of tape-form recording medium
  • Manufacturing method of tape-form recording medium
  • Manufacturing method of tape-form recording medium

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0074] Out of undercoat layer coating liquid compositions below, kneading a first agent with a kneader, then adding a second agent and stirring it, dispersing it by a sand mill with making a staying time 90 minutes, and after adding a third agent thereto and stirring and filtering it, it was made an undercoat layer coating liquid.

[0075] In addition, other than this, out of magnetic-layer-use coating liquids shown below, kneading a first agent with a kneader, then dispersing it by a sand mill with making a staying time 60 minutes, and adding a second agent of the coating liquid compositions thereto and stirring and filtering it, thus it was made a magnetic-layer-use coating liquid.

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(First Agent)

[0076] Iron oxide powder (particle diameter: 0.15×0.02 μm): 70 parts [0077] Alumina (α ratio: 50%, particle diameter: 0.05 μm): 8 parts [0078] Carbon black (particle diameter: 15 nm): 25 parts [0079] Stearic acid / butyl stearate (50 / 50): 3.0 parts Vinyl chloride copolymer (containing-SO3Na ...

example 2

[0120] Except that a magnetic material was changed to a barium ferrite magnetic material below, a magnetic tape cartridge was made similarly as in the example 1.

[0121] The barium ferrite magnetic material is 2000 nm3 in particle volume, 3 in plate ratio, 3000 Oe in Hc, 70 m2 / g in SSA (Specific Surface Area), and 45 emu / g in σs; and a surface treatment was performed thereto with an aluminum compound.

example 3

[0122] Except that the substrate 2 to be used was changed to a film made of a polyethylene terephthalate (PET) resin, the magnetic tape MT of a was made similarly as in the example 1.

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Abstract

A manufacturing method of a tape-form recoding medium in the present invention includes a raw web manufacturing process of forming a data recoding layer on one side of a substrate and a back coat layer having a minute convexity on the other side thereof, and thus manufacturing raw web of the tape-form recoding medium; a raw web winding process of winding the raw web with a predetermined tension; a raw web rewinding process of rewinding the raw web; and a raw web heating process of heating the rewound raw web.

Description

BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] The present invention relates to a manufacturing method of a tape-form recoding medium. [0003] 2. Description of the Related Art [0004] As a conventional manufacturing method of a magnetic tape is known a method of: manufacturing a magnetic tape bulk roll by coating a coating liquid for forming a magnetic layer containing a magnetic material, a bonding agent, and a solvent on one side of a magnetic tape substrate sent out from a magnetic tape substrate bulk roll, and then orienting, drying, and winding the raw web; slitting a peripheral face of the magnetic tape bulk roll from one edge to the other edge for every tape width; and winding the magnetic tape from the slit raw web for every cassette tape, using a tape winder (for example, see paragraphs 0022 to 0024 in Japanese Patent Laid-Open Publication No. 2002-123934). [0005] At this time a mirror-finish treatment is dispensed to the magnetic tape substrate where su...

Claims

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Application Information

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IPC IPC(8): B65D79/00
CPCG11B5/84
Inventor KAKUISHI, YUTAKARYOKE, KATSUMIMEGURO, KATSUHIKO
Owner FUJIFILM HLDG CORP