JPS61172221A - Production of magnetic recording medium - Google Patents

Abstract

PURPOSE:To stabilize production condition and to reduce variance in characteristics by applying and drying a magnetic paint on a base and then smoothing the surface of the base. CONSTITUTION:The magnetic paint is applied to the base unwound from an unwinding part 1 for the rolled base at a coating part 2. The produced magnetic recording medium 4 is dried in a drying zone 3 and guided to a surface treating process through a guide roll 5. Then, the surface of the recording medium 4 is treated by a calender roll 6 and the treated recording medium 4 is taken up around a take-up part 7. Thus, the magnetic recording medium 4 is formed by applying and then drying the magnetic paint on the basis and is supplied for a surface treatment as a next stage, so the condition of the surface treatment is made constant and the medium is produced with small variance.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention This invention relates to a method for manufacturing magnetic recording media such as video tapes and audio tapes.

BACKGROUND OF THE INVENTION A conventional method for manufacturing magnetic recording media of this type has the structure shown in FIG. 2, as described in Nikkei Electronics [Recent Advances in Video and Audio Magnetic Tapes JP 94 (1976)]. That is, magnetic paint was applied onto a synthetic resin base, dried, and then rolled up before surface molding was performed.

Problems to be Solved by the Invention However, with this method, there is a problem in that the surface forming conditions are different between the unwinding and the end of the roll because the roll is once rolled up after drying.

This is due to the following reasons.

However, if magnetic paint is applied onto a synthetic resin base and then wound up after drying, the base that was first coated with magnetic paint will remain on the core of the winding, and the slower the coater, the faster the surface treatment will be. There was a time when I was very close. In other words, since the rear end is reversed, the surface treatment conditions are different, which affects the characteristics of the magnetic recording medium.

Therefore, the present invention minimizes variations in the characteristics of magnetic recording media by keeping the surface treatment conditions constant.

Means for solving the problems and technical means of the present invention for solving the above problems are as follows:
The method consists of applying a magnetic paint onto a support, drying it, and subsequently subjecting the support to surface smoothing treatment.

action The effect of this technical means is as follows.

In other words, by performing surface treatment continuously after the paint on the support has been applied and dried, the surface treatment time after coating is constant and the surface treatment is performed under constant conditions. This means that Since the surface treatment conditions are constant, the characteristics of the magnetic recording medium have less variation.Example An example of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a schematic diagram showing an embodiment of the method for manufacturing a magnetic recording medium of the present invention. 1 is an unwinding part of the roll-shaped support. Reference numeral 2 denotes a coating section that applies magnetic paint to the support unwound from the unwinding section 1. 3 is a magnetic material on the support.
This is a drying zone where the magnetic recording medium 4 coated with is dried. Reference numeral 5 designates a guide roll that guides the magnetic recording medium 4 to the surface treatment culm, 6 a calender roll that performs surface treatment on the magnetic recording medium 4, and 7 a winding unit that winds up the entire surface-treated magnetic recording medium 4. With the above configuration, the magnetic recording medium 4 is dried after coating the magnetic material on the support. Thereafter, the sheet is guided to a guide roll 6 and then transferred to the next step of surface treatment, and finally wound up by a winding section 7.

Therefore, since the surface treatment is performed in the order in which the magnetic paint is applied onto the support, the surface treatment Ω conditions are constant, and manufacturing can be performed with less variation.

Effects of the Invention The present invention is capable of stabilizing manufacturing conditions and manufacturing magnetic recording media with less variation in characteristics by continuously performing the coating/drying process and the surface treatment process for magnetic recording media. It is extremely useful in practical terms.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram of a method for manufacturing a magnetic recording medium according to an embodiment of the present invention, and FIG. 2 is a process diagram showing a conventional method for manufacturing a magnetic recording medium. 1... Unwinding section, 2... Coating section, 3.
... Drying zone, 4 ... Magnetic recording medium, 5
... Guide roll, 6 ... Calendar roll, 7 ... Winding section.

Claims (1)

[Claims] 1. A method for producing a magnetic recording medium, which comprises applying a magnetic paint onto a support and drying it, and then subsequently subjecting the support to surface smoothing treatment.