JPH09306479A - Slurry coating device - Google Patents

Abstract

Kind Code: A1 Abstract: A slurry coating device capable of making the slurry coating thickness of a central portion and an end portion of a substrate uniform when adjusting the coating thickness of a slurry coated on a substrate. SOLUTION: In a slurry coating apparatus having a slurry tank, a substrate moving upward in the slurry tank, and a slit for adjusting a coating thickness of slurry attached to the substrate, the slurry coating apparatus is provided below a slit 2. And a roll slit 3 for adhering the slurry 6a scraped off by the slit 1 and a removing roll 4 for contacting the roll slit 3 and removing the slurry 6a adhering to the roll slit 3 while adjusting the slurry coating thickness. And.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a slurry coating device, and more particularly to a slurry coating device capable of making the slurry coating thickness uniform at the central portion and the end portion of a substrate.

[0002]

2. Description of the Related Art Generally, an electrode plate used in an alkaline storage battery or the like is manufactured by applying a slurry of electrode material powder to a substrate having a large number of holes such as sponge-like nickel or punching metal. In the slurry applying step, if the thickness of the slurry attached to the substrate is not uniform, the characteristics of the internal resistance and capacity of the battery may vary. Conventionally, in order to uniformly adjust the slurry coating thickness, for example, a slurry coating apparatus as disclosed in JP-A-3-43958 has been used.

A conventional slurry coating apparatus 50, as shown in FIG. 6, includes a slurry tank 52 containing a slurry 51,
A substrate 53 that moves upward in the slurry tank 52,
The substrate 53 has a pair of slits 54, 54 for adjusting the thickness of the slurry excessively attached to the substrate 53.

The substrate 53 is formed in a long strip shape,
It is pulled up in the vertical direction by a take-up roll (not shown).

As shown in FIG. 5, the slit 54 has a substantially trapezoidal cross section and is formed so as to extend in the longitudinal direction.
The slits 54, 54 are arranged close to each other and face each other. The substrate 53 is introduced between the opposing vertical surfaces 54a of the slit 54, and the slurry 51a attached to the substrate 53
(See FIG. 6) Adjust the coating thickness. The width between the vertical surfaces 54a can be adjusted so as to obtain a desired slurry coating thickness. In addition, the slurry 51 b scraped off at the entrance of the slit 54 is the inclined surface 54 of the slit 54.
Circulate along b. The inclined surface 54b is inclined at a predetermined angle (30 ° to 75 °) with respect to the longitudinal direction of the substrate 53, and prevents the slurry from staying in the lower portion of the slit 54.

As shown in FIG. 6, the substrate 53 is introduced from the bottom of a slurry tank 52 containing the slurry 51, passes through the slurry tank 52, and is placed on both sides of the substrate 53.
a adheres. Next, the substrate 53 passes between the vertical surfaces 54a of the slit 54 to obtain a desired slurry coating thickness. Excessive slurry 51b scraped off at the entrance of slit 54
Circulates along the inclined surface 54b, and further, due to its own weight, along the surface of the slurry 51a, the slurry tank 52
Run down.

[0007]

The slurry 51b scraped off by the slit 54 of the conventional slurry coating apparatus 50 tends to gather in the central portion of the substrate 53 due to its viscosity (see FIG. 5). Therefore, a part of the slurry 51a adhering to and rising on the substrate 53 will be dropped together with the scraped-off slurry 51b. Therefore, as shown in FIG. 7, the slurry coating thickness at the central portion of the substrate becomes smaller than the slurry coating thickness at the end portions, and there is a problem that a uniform slurry coating thickness cannot be obtained.

The present invention has been made in view of the above problems, and when adjusting the coating thickness of the slurry attached to the substrate, it is possible to make the slurry coating thickness of the central portion and the end portion of the substrate uniform. An object of the present invention is to provide a slurry coating device that can be used.

[0009]

In order to solve the above-mentioned problems, a slurry coating apparatus of the present invention applies a slurry tank, a substrate which moves upward in the slurry tank, and a slurry applied to the substrate. In a slurry coating device having a slit for adjusting the thickness, a slit provided on the lower side of the slit for adjusting the slurry coating thickness, and a roll slit for adhering the slurry scraped off by the slit, and contacting the roll slit. And a removal roll for removing the slurry adhering to the roll slit.

A slurry coating apparatus according to another embodiment of the present invention is
In a slurry coating device having a slurry tank, a substrate that moves upward in the slurry tank, and a slit that adjusts the coating thickness of the slurry adhered to the substrate, the slurry coating device is provided below the slit and has a slurry coating thickness. And a roll slit to which the slurry scraped off by the slit is attached, and a removing spatula that is in contact with the roll slit and removes the slurry attached to the roll slit, are characterized in that .

According to the slurry coating apparatus of the present invention, the slurry scraped off by the slits adheres to the roll slits provided under the slits without dropping the rising slurry adhering to the substrate. , Is removed to the outside by a removing roll or a removing spatula.

[0012]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a side view showing a slurry coating apparatus of the present invention, and FIG. 2 is a front view showing the slurry coating apparatus of the present invention.

As shown in FIGS. 1 and 2, a slurry coating apparatus 1 of the present invention is provided with a pair of slits 2 and 2 arranged in close proximity to each other and facing each other, and provided below the slit 2. The pair of roll slits 3 and 3 for adhering the slurry 6a scraped off by the slit 2 and the pair of removing rolls 4, 4 for removing the slurry 6a adhering to the roll slit 3 to the outside while adjusting the slurry coating thickness And.

The slit 2 has a trapezoidal cross section and is formed so as to extend in the longitudinal direction. The substrate 5 is introduced between the opposed vertical surfaces 2a of the slit 2 and the coating thickness of the slurry 6b attached to the substrate 5 is adjusted. The width between the vertical surfaces 2a can be appropriately adjusted to obtain a desired slurry coating thickness.

The roll slits 3 are arranged so as to face each other with the substrate 5 sandwiched therebetween, and are preferably positioned near the slits 2 so that the slurry 6a scraped off by the slits 2 can be immediately attached. The interval between the roll slits 3 facing each other can be appropriately adjusted depending on the type and state of the slurry 6a. Each of the roll slits 3 includes a pair of rolls 3a and a roll 3 installed along the substrate 5 at a predetermined interval.
It is composed of an endless belt 3b wound around a. The inner portion of the endless belt 3b is the slurry 6b attached to the substrate 5.
And the slurry 6b passes between the pair of roll slits 3 to adjust the slurry coating thickness. In addition, as the substrate 5 rises, the endless belt 3b moves due to friction with the substrate 5, whereby the roll 3a rotates in the arrow direction.

The removing roll 4 is in contact with the outer portion of the endless belt 3b of the roll slit 3. The removal roll 4 is rotationally driven by an external drive device (not shown) in the arrow direction which is the same rotation direction as the roll 3a of the roll slit 3.

Next, the operation of the coating apparatus 1 of the present invention will be described.

The substrate 5 pulled up by a driving device and a winding roll (not shown) passes through a slurry tank (not shown) to apply the slurry 6b on both sides. Next, as shown in FIG. 1, the substrate 5 passes between the endless belts 3b of the roll slit 3 and is introduced into the slit 2 to obtain a desired slurry coating thickness.

The excess slurry 6a scraped off by the slit 2 is attached to the surface of the endless belt 3b of the roll slit 3. Then, the attached slurry 6a
After being transported by the endless belt 3b, is attached to the removing roll 4 that is in contact with the outer portion of the endless belt 3b, and is removed to the outside.

According to the present invention, the slurry 6a scraped off by the slit 2 is removed by the roll slit 3 and the removing roll 4 without pulling down the slurry 6b adhering to the substrate 5 and rising. It is possible to make the slurry coating thickness of the central portion and the end portion of the substrate 5 uniform.

FIG. 3 is a side view showing a slurry coating device according to another embodiment of the present invention, and FIG. 4 is a front view showing a slurry coating device according to another embodiment of the present invention.

As shown in FIGS. 3 and 4, this slurry coating apparatus 10 is provided with a removing spatula 11 which is in contact with the outer portion of the endless belt 3b instead of the removing roll 4. The removing spatula 11 is made of rubber, and its tip is formed with an acute angle and extends in the horizontal direction.

According to this slurry coating apparatus 10, the slurry 6a attached to the surface of the endless belt 3b of the roll slit 3 is conveyed by the endless belt 3b and then removed from the outer end portion of the endless belt 3b in contact therewith. Spatula 11
It is scraped off by the tip of and removed to the outside.

The number, structure, and arrangement of the slit 2, the roll slit 3, the removing roll 4, and the removing spatula 11 according to the present invention are not limited to those in the above-mentioned embodiment, and are described in the scope of claims. Various modifications are possible within the scope of the technical matters described.

[0025]

According to the slurry coating apparatus of the present invention, the slurry scraped off by the slit does not drop off the slurry adhering to the substrate and rising to the roll slit provided under the slit. Since it adheres and is removed by the removal roll or the removal spatula, the slurry coating thickness can be made uniform in the central portion and the end portion of the substrate.

[Brief description of drawings]

FIG. 1 is a side view showing a slurry coating apparatus of the present invention.

FIG. 2 is a front view showing a slurry coating device of the present invention.

FIG. 3 is a side view showing a slurry coating device according to another embodiment of the present invention.

FIG. 4 is a front view showing a slurry coating device according to another embodiment of the present invention.

FIG. 5 is a perspective view showing a conventional slit.

FIG. 6 is a side view showing a state in which the slurry scraped off by a conventional slit flows down into a slurry tank.

FIG. 7 is a cross-sectional view showing a slurry coating state when the slurry coating thickness is adjusted using a conventional slurry coating device.

[Explanation of symbols]

 1, 10: Slurry coating device 2: Slit 3: Roll slit 3a: Roll 3b: Endless belt 4: Removal roll 5: Substrate 6a, 6b: Slurry 11: Removal spatula

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Inventor Masayuki Sakamoto 2-6-1, Marunouchi, Chiyoda-ku, Tokyo Furukawa Electric Co., Ltd. (72) Inventor Satoshi Hamakawa 2-6-1, Marunouchi, Chiyoda-ku, Tokyo Furukawa Electric Co., Ltd. (72) Inventor Kiyomasa Yoshinaga 23-6 Joban Shimofunao-cho, Iwaki City, Fukushima Prefecture Furukawa Battery Co., Ltd. Iwaki Plant

Claims (2)

[Claims] 1. A slurry coating apparatus comprising: a slurry tank; a substrate which moves upward in the slurry tank; and a slit which adjusts a coating thickness of slurry attached to the substrate. A roll slit that is provided to adjust the slurry coating thickness and that attaches the slurry scraped off by the slit, and a removal roll that contacts the roll slit and removes the slurry that adheres to the roll slit, Characteristic slurry coating device. 2. A slurry coating apparatus comprising: a slurry tank; a substrate which moves upward in the slurry tank; and a slit which adjusts a coating thickness of slurry attached to the substrate. A roll slit provided to adjust the slurry coating thickness and to attach the slurry scraped off by the slit, and a removal spatula that contacts the roll slit and removes the slurry attached to the roll slit. Characteristic slurry coating device.