Coating processes – Magnetic base or coating – Magnetic coating
Reexamination Certificate
2000-04-05
2001-10-02
Pianalto, Bernard (Department: 1762)
Coating processes
Magnetic base or coating
Magnetic coating
C118S203000, C118S204000, C118S244000, C427S428010
Reexamination Certificate
active
06296898
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a method and a system for manufacturing a magnetic recording medium such as a magnetic tape.
2. Description of the Prior Art
A magnetic recording medium is generally manufactured in the form of a magnetic tape by applying magnetic paint containing a magnetic material onto a substrate serving as a long nonmagnetic support, applying a necessary treatment such as a magnetic-field orientation treatment to the substrate, drying the paint, and then smoothing the surface of the substrate.
The magnetic-paint applying method includes the gravure method, reverse method, and die method. In the case of the gravure coating method among the above methods, magnetic paint is applied to a gravure roller
7
to which a knurling treatment
8
(constant-directional longitudinal groove is formed) is applied as shown in FIG.
3
.
The magnetic paint on the gravure roller
7
is transferred by setting a nonmagnetic support of a magnetic recording medium, that is, a base film (substrate)
5
between the gravure roller
7
and a back roller
9
and pressure-welding them.
Then, the surface of the substrate
5
to which the magnetic paint is applied is smoothed by a smoother
16
, then made to pass through the cutting step, and a magnetic tape is obtained.
In this case, if the magnetic paint is applied up to ends of the substrate
5
, various problems occur in that the magnetic paint attached to the gravure roller
7
is dried, removed, and scattered. Therefore, the magnetic paint is not applied to portions up to approx. 10 mm from ends.
Moreover, if the gravure roller
7
with the magnetic paint attached is rotated at a high speed, the thickness of the magnetic paint increases at only both ends of the gravure roller
7
due to knurling of the gravure roller
7
and the thickly attached paint is scattered due to rotation of the gravure roller
7
.
Therefore, a resin plate referred to as a doctor blade
4
is provided for each end of the gravure roller
7
and pressed against the gravure roller
7
at a constant pressure to scrape off the magnetic paint.
An air tube
15
is set to a doctor blade
4
to take in scraped paint tailings by air and thereby prevent a recording or reproducing error from occurring due to attachment of paint tailings on a magnetic tape.
If the doctor blade
4
is used for a long time in the above manner, the air tube
15
is immediately clogged, paint tailings are not taken in, paint tailings scatter due to vibration of rotation, pressed marks of paint tailings are formed on a magnetic tape or paint tailings are attached to the tape. Therefore, it is necessary to replace the air tube
15
whenever the problem occurs.
SUMMARY OF THE INVENTION
The present invention is made to solve the above problems and its object is to provide a method and a system for manufacturing a magnetic recording medium capable of effectively removing paint tailings.
In a method according to the present invention for manufacturing a magnetic recording medium, an organic solvent is supplied to a contact portion between doctor blades set at both ends of a gravure roller and the gravure roller.
According to a method of the present invention for manufacturing a magnetic recording medium, it is possible to prevent paint tailings attached to both ends of a gravure roller from drying by supplying an organic solvent to a contact portion between a doctor blade and the gravure roller.
A system of the present invention for manufacturing a magnetic recording medium comprises a gravure coater for transferring magnetic paint by passing a nonmagnetic support between a gravure roller and a back roller, wherein solvent supply means is included which supplies an organic solvent to a contact portion between doctor blades set at both ends of the gravure roller and the gravure roller or vicinities of the contact portion.
A system of the present invention for manufacturing a magnetic recording medium makes it possible to prevent paint tailings attached to both ends of a gravure roller from drying by supplying an organic solvent to a contact portion between a doctor blade and the gravure roller.
REFERENCES:
patent: 4548840 (1985-10-01), States et al.
patent: 9314292 (1994-01-01), None
patent: 0603145 (1994-06-01), None
Pianalto Bernard
Sonnenschein Nath & Rosenthal
Sony Corporation
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