JPH0639821Y2 - Coating equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a coating apparatus for coating a substrate with a coating liquid or the like.

[Conventional technology]

FIG. 2 is a front view of a conventional coating apparatus, and FIG. 3 is an operation explanatory view thereof. In FIG. 2, the coating liquid 7 is supplied to the metering roll 1 and the applicator roll 2 through the duct 6 or the like.
Supplied between and. The metering roll 1 and the applicator roll 2 make a so-called natural rotation in which they rotate in reverse while making contact with each other.
Makes a so-called reverse rotation that moves in the opposite direction with respect to the substrate 3 to be coated. The coating liquid 7 supplied through the duct 6 or the like forms a liquid pool 5 at the contact portion between the metering roll 1 and the applicator roll 2, which is called a nip portion.
The coating liquid 7 that has flowed out of this liquid pool 5 between the rolls
Depending on their speed ratio, they mainly adhere to the applicator roll 2 and move, and theoretically the entire amount is transferred to the substrate 3. Since the base 3 is not always flat in the width direction,
In many cases, the applicator roll 2 is a rubber winding roll and the metering roll 1 is a metal roll in order to improve the contact property.

[Problems to be solved by the device]

In the conventional coating apparatus as described above, it is often necessary to increase the film thickness of the liquid film transferred to the substrate 3 while keeping the speed of the substrate 3 constant. In such a case, by increasing the rotation speeds of the metering roll 1 and the applicator roll 2, the film thickness which passes through between the liquid pool 5 and the rolls increases, and the coating liquid 7 per unit time is applied to the substrate 3. It is possible to increase the film thickness transferred to the substrate 3 because the supply amount of the

However, when this operation is actually performed, as shown in FIG. 3, a large number of film thickness variations in the axial direction of the roll, called ring patterns, occur in the liquid film that passes through the rolls from the liquid pool and emerges. There is a problem that the form of the film is directly transferred to the substrate 3 to cause uneven coating.

[Means for Solving the Problems]

The coating apparatus according to the present invention is intended to solve the above-mentioned problems, and collects the coating liquid at the contact portion between the metering roll and the applicator roll, which are in contact with each other and rotate downward in the reverse direction. A coating apparatus for coating a traveling substrate directly through the applicator roll, characterized by comprising a means for swinging the metering roll in an axial direction to level the coating liquid accumulated in the contact portion. I am trying.

[Action]

That is, in the coating apparatus according to the present invention, the metering roll that contacts the applicator roll for coating to form the coating liquid pool swings in the axial direction to even out the coating liquid in the coating liquid pool. The coating liquid that comes out of the coating liquid reservoir after passing between the two rolls and adheres to the applicator roll is leveled with a metering roll in the coating liquid reservoir to apply the surface of the applicator roll. The ring pattern that occurs in the liquid film in the coating liquid pool as unevenness in film thickness in the axial direction disappears.

〔Example〕

FIG. 1 is a perspective view of a coating apparatus according to an embodiment of the present invention. In the drawings, members common to those shown in FIGS. 2 and 3 are designated by the same reference numerals as those used in FIGS. 2 and 3 and their description is omitted.

In the figure, the coating apparatus according to the present embodiment is provided with a link 8, a rod 10, a rotating plate 11, etc. for swinging the metering roll 1 as shown in the figure. For example, when a steel plate is used for the substrate 3, the traveling speed of the substrate 3 is 100 to 200 m /
min, the diameter of the metering roll 1 is 150 mm, and the diameter of the applicator roll 2 is 150 for the coating thickness of 20-40μ.
If it is set to mm, the average arithmetic speed between the metering roll 1 and the applicator roll 2 is usually 5 to 10 at 50 to 100 m / min.
It produces a ring pattern of mm pitches.

In the present coating apparatus, in order to prevent this, the metering roll 1 is swung by a mechanical device. That is,
The rotating plate 11 is driven by a motor (not shown) to rotate, and this rotation is transmitted to the link 8 for converting the rotation into swing through the rod 10, and the swing of the link 8 is transmitted to the shaft of the metering roll 1. Thus, the metering roll 1 has a structure that swings in the axial direction. Reference numeral 9 is a fulcrum, 14 is a ball bearing, and 15 is a thrust bearing.

In this way, when the metering roll 1 swings in the bearing direction, a ring pattern that occurs as a film thickness unevenness in the roll axis direction is smoothed and disappears in the liquid film of the coating liquid, so that the liquid having a uniform film thickness is formed on the substrate 3. The film is supplied to prevent uneven coating. Further, the wear of the metering roll 1 caused by the powder contained in the coating liquid can be made uniform in the roll axial direction, so that the service life of the metering roll is extended and foreign matter is caught between the rolls. Is prevented.

[Effect of device]

The coating device according to the present invention is configured as described above, and the coating liquid adhering to the applicator roll is leveled by the metering roll in the coating liquid reservoir to form a liquid film on the surface of the applicator roll. Since the ring pattern that occurs as uneven film thickness in the axial direction in the coating liquid pool disappears, for example, even in the case of a coating liquid in which fine particles with different specific gravities are mixed, a liquid film of uniform thickness is supplied to the substrate to prevent uneven coating. In addition, the coating liquid pool is formed by the applicator roll and the metering roll, and the coating liquid is leveled by swinging the metering roll in the axial direction. The structure is very simple because it is applied to the substrate, and the coating liquid pool is directly applied to the applicator roll to be applied. Since the coating solution is supplied and applied directly to the substrate from the applicator roll, for example, even a quick-drying coating solution is leveled with a metering roll with a margin, and the leveled coating solution is directly applied from the applicator roll to the substrate. Therefore, uneven coating will not occur.

[Brief description of drawings]

FIG. 1 is a perspective view of a coating apparatus according to an embodiment of the present invention, FIG. 2 is a front view of a conventional coating apparatus, and FIG. 3 is an explanatory view of its operation. 1 ... Metering roll, 2 ... Applicator roll, 3 ... Substrate, 5 ... Liquid pool, 7 ... Coating liquid, 8 ... Link, 10 ... Rod, 11 ... Rotating plate, 14 ... Ball bearing, 15 …… Thrust bearing.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yuzuru Kadano 5007 Itozaki-cho, Mihara-shi, Hiroshima Mitsubishi Heavy Industries, Ltd. Mihara Manufacturing Co., Ltd. (56) References Japanese Patent Publication Sho 60-38186

Claims (1)

[Scope of utility model registration request] 1. A coating method in which a coating liquid is accumulated at a contact portion between a metering roll and an applicator roll, which are in contact with each other and rotate in a downward direction, and the accumulated coating liquid is directly applied to a substrate running through the applicator roll. The coating apparatus comprises a means for swinging the metering roll in the axial direction to level the coating liquid accumulated in the contact portion.