JPH0838978A - Air floating drier - Google Patents

Abstract

PURPOSE:To allow a wide film-like sheet applied with a coating material such as a magnetic coating material on the surface to travel at constant speed, while it is floated by air in a heat drying chamber, to make the coating material dry and to wind up the film-like sheet dried the coating material without wrinkles. CONSTITUTION:In an air floating drier 1A by which the film-like sheet F coated with the magnetic coating material in an undried state is dried the coating material while the sheet is floated by blowing air from the upper and lower sides in the heat drying chamber 2, plural pieces of crown rollers 6 are arranged at an exit side of the heat drying chamber 2 so that the crown quantity is gradually mitigated, and the sheet is wound up by a flat roller 4, while deformation generated on the film-like sheet F by drying is gradually removed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention allows a wide film-like sheet having a surface coated with a coating material such as a magnetic coating material to be run at a constant speed while air-floating in a heating / drying chamber. The present invention relates to an air floating dryer which is dried so that a film-like sheet whose coating material has been dried can be wound up without "wrinkles".

[0002]

2. Description of the Related Art First, a conventional air floating dryer is used as an example to dry a film-like sheet coated with a magnetic coating on a wide surface of a magnetic recording medium used in a magnetic recording / reproducing apparatus. 3 to 5
Will be explained. FIG. 3 is a conceptual view of a conventional air floating dryer, and FIG. 4 is one of a film sheet and a flat roller for explaining a generation state of wrinkles that tend to occur at the outlet side of the air floating dryer shown in FIG. 5 is a perspective view of a part, and FIG.
FIG. 6 is a perspective view of a part of an air floating dryer showing an improved structure of the prior art for removing the wrinkles shown in FIG. 4.

Reference numeral 1 generally indicates a conventional air floating dryer. The air floating dryer 1 includes a heating / drying chamber 2 and a plurality of nozzles 3 disposed inside the heating / drying chamber 2 which are alternately arranged above and below the heating / drying chamber 2.
And a heating device (not shown) and a plurality of cylindrical so-called flat rollers 4 and the like installed on the inlet side 2A of the heating and drying chamber 2 and also on the supply roller (not shown) and its outlet side 2B. It consists of

Reference numeral F is a wide film-like sheet used in a magnetic recording / reproducing apparatus, the surface of which is coated with magnetic paint, and the inlet side 2A of the heating / drying chamber 2 is used.
The magnetic paint in is not yet dried.

A film-like sheet F in which this magnetic paint is not dried is supplied from the inlet side 2A of the heating / drying chamber 2 at a predetermined speed and is passed over the air outlets of the plurality of nozzles 3 while meandering. The undried magnetic paint is sequentially dried while supporting the film-like sheet F in a non-contact state with the air blown from the air outlets. This drying is performed by a heating device that heats the heating and drying chamber 2. The film-shaped sheet F on which the magnetic paint has been dried is wound up via a plurality of flat rollers 4 installed on the outlet side 2B of the heating / drying chamber 2.

When the magnetic paint is dried, the undried magnetic paint applied to the surface of the film-like sheet F tends to shrink due to heat at the same ratio in the longitudinal direction and the width direction. Also, the film-like sheet F itself shrinks due to heat when dried, but in order to stably run this film-like sheet F at a predetermined speed, tension is applied in its longitudinal direction, The contraction ratio with respect to the width direction is different, and as a result, as shown in FIG. 4, the film-shaped sheet F is distorted D, and the film-shaped sheet F on the outlet side 2B.
The center portion of the sheet tends to have wrinkles W and is wound up by the flat roller 4 as it is.

[0007]

In order to remove this wrinkle W, 1. Close the space between the flat rollers 4. 2. Sliding is improved by lowering the coefficient of friction of the axial surface of the flat roller 4. 3. Decrease the speed of the air blown from the nozzle 3. Measures have been taken such as changing the wind speed distribution of the air blown from the nozzle 3.

However, as long as the flat roller 4 is used, the film-like sheet F meanders, and as a result, as shown in FIG.
As shown in FIG. 5, a tape is formed on the surface of the flat roller 4 so as to form a spiral thin groove 5A extending from its central portion toward both axial ends,
Attempts were also made to prevent meandering by using the grooved roller 4A symmetrically provided with 5B and to remove the wrinkle W, but satisfactory results were not obtained. In addition, the attempt to reduce the wind speed of the air in the above item 3 may not obtain a sufficient and stable wind pressure, and the film sheet F may not float, so that it is preferable that the magnetic paint is scratched by contacting the nozzle 3. In addition, there is a problem that there is no phenomenon, and the attempt to change the wind velocity distribution of the air described in the above item 4 involves a difficulty in the adjustment. The present invention aims to solve these various problems.

[0009]

Therefore, the air floating dryer of the present invention supplies a film-like sheet having a surface to which an undried paint is applied at a predetermined traveling speed from the inlet of a heating / drying chamber, In the air drying dryer, in which an air floating dryer that blows air from above and below to the film-like sheet to dry the paint and the like while floating in the heating and drying chamber, a crown roller is provided on the outlet side of the heating and drying chamber to solve the above problems. did.

Further, the crown roller is composed of a multi-stage crown roller with a predetermined gap, and the crown amount is gradually relaxed as the distance from the outlet of the heating / drying chamber increases, and further, Further, the film-like sheet coming out of the heating / drying chamber is made to travel so as to alternately sew the crown rollers composed of the multistages so as to regenerate the distortion.

[0011]

Therefore, according to the air floating dryer of the present invention, the distortion that tends to occur in the central portion of the film-like sheet can be regenerated by the curved surface bulging around the central portion of the crown roller.

[0012]

EXAMPLES Next, the air floating dryer of the present invention will be described with reference to FIGS. 1 and 2. 1 is a conceptual view of the air floating dryer of the present invention, and FIG. 2 is a cross-sectional view showing curved surfaces of a plurality of crown rollers installed on the outlet side of the air floating dryer of FIG. It should be noted that the same components as those of the conventional air floating dryer are designated by the same reference numerals and described.

First, the structure of the air floating dryer 1A of the present invention will be described. This air floating dryer 1A includes a heating and drying chamber 2 and a plurality of nozzles 3 which are disposed inside the heating and drying chamber 2 and which are alternately arranged above and below the heating device and a heating and drying chamber 2 which are not shown in the drawing. Installed on the entrance side 2A,
This is also composed of a supply roller (not shown) and a plurality of crown rollers 6 installed on the outlet side 2B thereof.

From the inlet side 2A of the heating / drying chamber 2, a film-like sheet F in which the magnetic coating is not dried is supplied at a predetermined speed and a predetermined tension, and meanders above the air outlets of the plurality of nozzles 3. The undried magnetic coating material is successively dried while the film-shaped sheet F is supported in a non-contact state by allowing the air to be passed through while allowing the air to flow through the air outlets. The film-shaped sheet F having the magnetic coating material dried is wound up through the plurality of crown rollers 6 installed on the outlet side 2B of the heating and drying chamber 2.

The plurality of crown rollers 6 are drum-shaped rolls formed by a curved surface bulging around the center thereof, and each of the crown rollers 6A, 6B, 6C,
6D ... 6N, that is, the bulged curved surface, that is, the amount of crown is gradually decreased, the crowns are installed at a predetermined interval, and the flat roller 4 is arranged behind the flat roller 4 as in the prior art.

[0016]

With the above-described structure, in the air floating dryer 1A of the present invention, the strain D that tends to occur in the central portion of the film-like sheet F is the crown rollers 6A, 6B, 6C, 6D. .. 6N is gradually rehabilitated, wrinkles W can be eliminated, and it can be smoothly transferred to the flat roller 4 installed behind the crown roller 6. According to the present invention, it is possible to easily prevent the generation of wrinkles, which is a problem, with such a simple mechanical structure, and thus it is possible to improve the manufacturing yield of the magnetic medium as the final product.

[Brief description of drawings]

FIG. 1 is a conceptual diagram of an air floating dryer of the present invention.

FIG. 2 is a cross-sectional view showing curved surfaces of a plurality of crown rollers installed on the outlet side of the air floating dryer of FIG.

FIG. 3 is a conceptual diagram of a conventional air floating dryer.

FIG. 4 is a partial perspective view of a film-like sheet and a flat roller for explaining a generation state of wrinkles that tend to occur on the outlet side of the air floating dryer shown in FIG.

5 is a perspective view of a part of an air floating dryer showing an improved structure of the prior art for removing the wrinkles shown in FIG. 4. FIG.

[Explanation of symbols]

 1A Air floating dryer of this invention 2 Heating / drying chamber 2A Inlet side 2B Outlet side 3 Nozzle 4 Flat roller 6 Crown roller F Film-like sheet D Strain W Wrinkle

Claims (3)

[Claims] 1. A film-like sheet having a surface coated with an undried coating material is supplied from an inlet of the heating / drying chamber at a predetermined traveling speed by applying a predetermined tension, and the film-like sheet is supplied in the heating / drying chamber. An air floating dryer for spraying air from above and below to dry the paint while floating it, wherein a crown roller is provided on the outlet side of the heating and drying chamber. 2. The crown rollers are configured in multiple stages with a predetermined gap therebetween, and are arranged such that the crown amount of each crown roller is gradually relaxed as the distance from the outlet of the heating and drying chamber increases. The air floating dryer according to claim 1. 3. The air floating dryer according to claim 2, wherein the film-like sheet coming out of the heating and drying chamber is run so as to alternately sew the multi-stage crown rollers.