JPS5849819Y2 - Web coating surface leveling device - Google Patents

Description

[Detailed description of the invention] This invention relates to a device that uses a blade to smooth and level the paint applied to a thin film web, and its purpose is to prevent wrinkles from forming on the web during this process. shall be.

For example, when manufacturing magnetic tapes that are incorporated into various magnetic tape cartridges, magnetic paint is applied to a wide endless web such as polyester film in a streak pattern using the gravure coating method, and then leveled with a blade to form a uniform coating. Forms a thick and smooth magnetic coating.

However, when leveling is performed using a blade, especially a flexible blade, vertical wrinkles tend to occur in the web on the front side of the blade due to uneven sliding resistance between the blade and the web.

These wrinkles lead to uneven coating thickness, and when the treated web is wound into a large roll, the wrinkles are amplified on the original roll, which has a serious effect on the magnetic tape product.

This invention focuses on this fact and attempts to completely eliminate the occurrence of wrinkles on the web in front of the blade.The feature of this invention is that the web is wrinkled at a position near the front of the blade and on the back side of the web. The reason is that a bulging guide roller is installed.

The details of this invention will be explained below based on the drawings.

In FIG. 1, reference numeral 1 denotes a gravure coating device, which applies the coating while passing a web 5 such as a polyester film between a coating roller 3 in which numerous inclined coating grooves 2 are formed and a rubber impression cylinder 4. The magnetic material 6 filled in the grooves 2 is transferred and coated on the surface of the web 5 in a diagonal pattern.

Reference numeral 7 denotes a leveling device for uniformly spreading the magnetic paint 6 applied to the surface of the web 5 in a predetermined pattern of lines over the web surface to form a smooth magnetic paint film 6a of a constant thickness,
This is taken from a flexible blade 8 which acts across the entire front width of the web 5 and a guide roller 9 which acts across the entire back width of the web 5.

Of these, the guide roller 9 has a bulge shape (tapered crown), and is horizontally mounted sufficiently close to the front side of the blade 8 so as to be freely rotatable.

Incidentally, when the width of the web 5 is about 1 m, the guide roller 9 has an outer diameter of 3Q mm at both ends, an outer diameter of about 31 to 35 mm at the center, and a width of 5 to 3Q mm in front of the blade 8.
It has been confirmed through experiments that it is most preferable to arrange it at a position of mm.

Note that this invention is not limited to the above-mentioned example, and after applying any kind of paint 6 to a thin film web 5 such as various synthetic resin films or paper by an appropriate means, the paint surface is scraped and leveled. It can be widely applied when doing so.

As explained above, according to this invention, the coating 6 on the surface
The web 5 coated with is subjected to tension in the width direction by a guide roller 9 in the shape of a bulge located just in front of the blade 8, and the web 5 is applied with the blade 8 without any vertical wrinkles on the thin film web 5. The paint 6 will be leveled.

Therefore, the coated surface of the web after treatment can be finished to be of high quality and uniformly smooth with no uneven coating thickness.

Moreover, since the web 5 after processing is sent in a wrinkle-free state, even when it is rolled into a roll with a large diameter, it is possible to prevent the occurrence of winding wrinkles as much as possible, thereby improving the quality of the final product. I was able to hope for improvement.

[Brief explanation of the drawing]

FIG. 1 is an overall perspective view of the device according to this invention, and FIG. 2 is a plan view of the main parts thereof. 1...Guzvia coating device, 2...Coating groove, 3...Coating roller, 4...Rubber impression cylinder, 5...Web , 6...Paint, 6a
... Paint film, 7 ... Scratching device, 8.
...Blade, 9...Guide roller.

Claims (3)

[Scope of utility model registration request] (1) When the paint applied to the surface of the thin film web 5 is leveled with the blade 8, a guide roller 9 with a bulge shape that acts on the back surface of the web 5 is installed near the front of the blade 8. A device for leveling a web paint surface, characterized by being installed. (2) The leveling device according to claim 1, in which the paint is transferred and applied to the web 5 by a gravure coating method. (3) The leveling device according to claim 1 or 2, wherein the blade 8 is a flexible blade.