JPS6218627A - Production of magnetic recording medium - Google Patents

Abstract

PURPOSE:To eliminate the variance in the quality generated in the case of once taking up a substrate at every stage by continuously subjecting the substrate on which a magnetic coating compd. is coated and dried to three stages; surface smoothing treatment, curing by heating and slitting under cooling. CONSTITUTION:This process for production consists of the 1st state for subjecting the substrate to the surface smoothing treatment after coating the magnetic coating compd. thereon and drying the coating, the 2nd stage for taking up said substrate and curing the coating while heating the same in succession of the 1st stage and the 3rd stage for un-winding and slitting the substrate having the curing temp. while cooling the substrate in succession of the 2nd stage. The process for producing the magnetic recording medium is made continuous and integral, by which the conditions for production are stabilized and the variance in the characteristics of the magnetic recording medium is decreased.

Description

DETAILED DESCRIPTION OF THE INVENTION FIELD OF INDUSTRIAL APPLICATION This invention relates to a method for manufacturing magnetic recording media such as video tapes and audio tapes.

2. Prior Art The conventional manufacturing method of this type of magnetic recording medium is described in (for example, "Study on High-Performance Painted Videotape" by Hajime Mata, 213).
2-8 (Video tape manufacturing process), the configuration was as shown in Figure 2. Magnetic paint is applied onto a synthetic resin base, dried, and then rolled up. Thereafter, the roll is unwound, surface molding is performed, and the roll is wound up and cured in a roll form.

After curing, it is unrolled from the roll and then shredded.

Problems to be Solved by the Invention However, in such a structure, since the paste is wound once after the surface forming, a temperature gradient occurs between the core and the outside of the rolled roll during the curing process, so it takes a long time to harden. In addition to this problem, there was also a problem in that the holding time of the set curing temperature varied outside the first turn of the core with respect to the coating film. Furthermore, there is a problem in that even in the cooling process after curing, uneven cooling occurs on the roll, resulting in a difference in characteristics between the core and the outside of the roll.

Therefore, the present invention aims to minimize variations in the characteristics of magnetic recording media, shorten the manufacturing time of magnetic recording media, and reduce costs.

Means for solving the problems and technical means of the present invention for solving the above problems are as follows:
A first step in which a magnetic paint is applied and dried on a support and then subjected to a surface smoothing treatment, and a second step in which the support is wound and cured while being heated following this first step. This second step is followed by a third step in which the support at the curing temperature is unwound and slit while being cooled.

action The effect of this technical means is as follows.

In other words, by sequentially performing the three steps of surface smoothing treatment, heating hardening, and cooling slitting on a support coated with magnetic paint and dried, variations in quality that occur when the support is rolled up after each step are eliminated. It disappears.

Embodiment Hereinafter, one embodiment of the present invention will be described based on 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 a support that is unwound from the unwinding section 1, 3 a drying zone that dries the magnetic recording medium 4 on which a magnetic material is coated on the support, and 5 a magnetic recording medium 4''f. : Guide roll leading to the surface treatment step 6; 7 is a hardening zone for hardening the magnetic recording medium 4 which has been processed; 8 is a hardening zone for hardening the magnetic recording medium 4'f!: slit while being cooled by the cooling section 9. It is a slitter that

Reference numeral 10 denotes a winding section that winds up the magnetic recording medium 4 with completed slits. With the above configuration, the magnetic recording medium 4 can be produced by coating the magnetic material on the support, drying, surface treatment, hardening, and so on.
It moves continuously with the slit and is processed and processed. Therefore, the processing and processing on the same support will be uniform, and there will be no variation in properties. Furthermore, compared to the case where the material is rolled up once, continuous production eliminates loss time between processes, leading to significant cost reductions.

Effects of the Invention By continuously passing through the manufacturing process of magnetic recording media, the present invention can stabilize manufacturing conditions, reduce variations in the characteristics of magnetic recording media, and reduce costs, which is of great practical value. expensive.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing 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. 2... Coating section, 3... Drying zone, 4
...magnetic recording medium, 6 ... surface treatment step, 7 ... hardening zone, 8 ... slitter, 9 ... cooling section. Name of agent: Patent attorney Toshio Nakao 1 person 2-
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Claims (1)

[Claims] A first step in which a magnetic paint is applied and dried on a support and then subjected to a surface smoothing treatment, and a second step in which the support is wound up and cured while being heated following this first step. and a third step of unwinding and slitting the support while cooling it, following the second step.