JPS63147571A - Paint pan with stirrer - Google Patents

Abstract

PURPOSE:To maintain paint compsn. uniformly for a long period with a paint pan for a roll coater by inclining the bottom plate of the pan body diagonally upward so as to constitute a paint tank in which a paint accumulates above the gap of a throttling part and disposing two stirrers therein. CONSTITUTION:The bottom plate 2a of the pain body 2 is inclined diagonally upward and the paint tank is constituted of the pan body 2, a pickup roll 7 and a gap constituting body 8. The paint 12 is stored in such paint tank up to the level higher than the throttling part 6. The stirrer 3 for rotating flow fixed with stirring vanes 3b on a shaft 3a parallel with the pickup roll is provided and is rotated by inverting and iterating the rotating directions. The stirrer 5 for parallel flow fixed perpendicularly with the stirring vanes 5b to a shaft 5a parallel with the roll 7 is further provided and is linearly moved by inverting and iterating the motion in the axial direction. The settlement of the additives, etc., of large sp. gr. in the paint is prevented by the rotating flow and parallel flow and the pint is sufficiently stirred according to the above- mentioned constitution, by which the paint compsn. is uniformly maintained.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is a method for continuous coating of a steel plate with a paint, especially a paint containing a high specific gravity additive, while maintaining a uniform paint composition over a long period of time. This invention relates to a paint pan with an agitation device that makes it possible.

[Conventional technology]

Painting and baking are generally done to give steel plates corrosion resistance and durability, as well as for aesthetic reasons.

In addition to paints that use boiling oil, which has been used for a long time, and various synthetic resins such as epoxy resin, polyester resin, acrylic sesame oil, and vinyl chloride resin, which have been widely used in recent years, as film-forming substances, Recently, paints containing additives with high specific gravity such as electrically conductive metal powder, such as stainless steel powder, have been used to improve weldability during processing.

A roll coater is mainly used to continuously coat a steel plate with a paint, and the roll coater is equipped with a paint tank or has a paint reservoir formed therein.

Below, various coating methods using conventional roll coaters having paint tanks and paint reservoirs will be outlined with reference to drawings.

FIG. 6 is an explanatory diagram showing the bottom feed method, and FIG. 7 is an explanatory diagram showing the top feed method.

In the bottom feed method shown in Fig. 6, the pickup roll 7
A metering roll 8' is provided as a gap member in close proximity thereto, and the gap can be adjusted.A paint tank 11 consisting of a simple container has a lower circumferential surface of a pick-up roll 7 immersed in the paint 12. As the pickup roll 7 rotates, the paint 12 is deposited on its circumferential surface and passed through a predetermined gap between it and the metering roll 8' (not rotating) so that a predetermined amount of paint 12 is deposited almost horizontally to the pickup roll 7. The steel plate 13, which is rotated in the same direction as the pink-up roll 7, is transferred to the circumferential surface of the applicator roll 9, which is provided in contact with the pink-up roll 7 and rotates in the same direction as the pink-up roll 7, and is transferred through the upper side. This allows the steel plate 13 to be coated continuously.

In the top feed system shown in FIG. 7, the metering roll 8' is the applicator roll 9 of the pickup roll 7.
The rolls are arranged almost in the same way as in the bottom-feed method, except that they are arranged in a substantially horizontal position on the opposite side, and the paint reservoir is formed by the circumferential surfaces of the pick-up roll 7 and the metering roll 8'. The paint 12 is supplied and stored in this paint reservoir. Therefore, this method is not suitable for low viscosity paints, but is said to be suitable for high viscosity paints such as vinyl chloride resin sol paints. In this method, the paint 12 is transferred and the steel plate 13 is coated by rotating each roll as shown in FIG. In this top feed system, the metering roll 8' is also rotated in order to make it easier for the paint 12 to pass through the gap between the pickup roll 7 and the metering roll 8'.

[Problem that the invention seeks to solve]

However, when the paint 12 contains additives with a high specific gravity, the paint tank 11 and paint reservoir section described above have the following problems.

That is, in the bottom feed method, the additive gradually settles to the bottom of the paint tank 11. Therefore, as time passes, the pickup roll 7, applicator roll 9. There is a problem in that the amount of additives in the paint 12 applied to the steel plate 13 decreases after this process, resulting in the production of a coated steel plate that does not have the desired effect due to the low additive content in the coating film. Ta.

In addition, in the top feed method, the additives settle below the paint reservoir, and the paint 12 with a high additive content is first supplied to the steel plate 13, and then the paint 12 with a low additive content is supplied to the steel plate 13. There was a problem in that the distribution of additives in the coating material 12 was not uniform, making it impossible to obtain a coated steel sheet with proper coating film performance.

[Means for Solving the Problems] The purpose of the present invention is to solve the problems of the prior art described above, and to provide uniform coatings over a long period of time even when using paints containing additives with high specific gravity. To provide a paint pan as a means for continuously coating a steel plate while maintaining the paint composition to form a coating film with a uniform composition.

That is, the present invention consists of a pan body and a side wall constituted by a pickup roll that transfers paint to an applicator roll in contact with a traveling steel plate and a gap structure provided close to the pickup roll. A paint pan constituting a paint tank that stores paint above the gap between the body and the body.The bottom plate of the pan body is inclined diagonally upward from the pickup roll side, and a stirring blade is mounted on a rotating shaft parallel to the pickup roll. is fixed substantially along the axial direction, and the rotary flow agitator, which rotates repeatedly by reversing the direction of rotation, is located near the pickup roll.
Further, a parallel flow agitator, which is composed of a shaft parallel to the pickup roll and a stirring blade provided perpendicular to the axis and moves linearly by reversing and repeating a predetermined stroke in the axial direction, is located above the position of the rotary flow agitator, The present invention relates to a paint pan with an agitation device, which is characterized in that each of the paint pans is equipped with an agitation device.

[Explanation of configuration]

The present invention will be explained in detail below with reference to the drawings.

FIG. 1 is a front view of one embodiment of a paint pan with an agitating device according to the present invention, with the roll group omitted; FIG. 2 is a sectional view taken along line A-A in FIG. 1; FIGS. The figures are a partially enlarged front view showing another example of a rotary flow agitator, Fig. 5 (a),
(B) and (C) are explanatory diagrams each showing an aspect of the stirring blade of the parallel flow stirrer.

In the drawings, reference numeral 1 denotes a paint pan according to the present invention, and as shown in FIG. A paint tank is constituted by the pan body 2 and one side wall consisting of a gap structure 8 forming a constricted portion 6 between the pan body 2 and the amprol 7. The gap forming body 8 forms an adjustable constriction part 6 between it and the pick-and-roll 7, and although a metering roll is shown in the example shown in the figure, since it does not require rotation, it can be used in the form of a plate like a doctor's knife. It can also be the body. The paint 12 is stored in the paint tank composed of the pan body 2, the pick-up roll 7, and the gap structure 8 above the constriction part 6,
The paint 12 that has passed through the constriction part 6 and has an appropriate thickness is transferred from the pick-up roll 7 to the applicator roll 9, and is further applied to the steel plate 13. The paint pan 1 according to the present invention has two types of paint in the pan body 2 having a special structure so as to maintain a uniform paint composition for a long time even when the paint 12 contains additives with high specific gravity. A rotary flow agitator 3 and a parallel flow agitator 4 are installed to generate different paint flows.

As shown in FIG. 2, the bread body 2 has a bottom plate 2a that is inclined obliquely upward from the pick-up roll 7 side, and an opposing wall 2b of one side wall formed by the pick-up roll 7 and the gap structure 8 at its upper end. Therefore, the area near the pickup roll 7 forms the deepest part. Bottom plate 2
The inclination angle α of a is preferably 20° to 30° with respect to the horizontal plane. As shown in FIG. 2, side plates 2c are provided at both ends of the bottom plate 2a in a shape that can come into contact with one side wall formed by the pickup roll 7 and the gap structure 8, further stabilizing and reinforcing the installed state. A support portion 2d and a pedestal portion 2e are provided as necessary.

The rotary flow agitator 3 is a rotary itl! that is installed parallel to the pickup roll 7. A stirring blade 3b is fixed to I3a substantially along the axial direction. This stirring blade 3b
As shown in Fig. 1, the installation is such that a large number of short stirring blades 3b are arranged in multiple rows (four rows in the example shown) in a staggered manner, changing the direction at a slight angle of inclination to the axial direction (parallel is also acceptable). Alternatively, as shown in Fig. 3, a plurality of continuous stirring blades 3b (four in the example) may be arranged in different directions at a slight angle of inclination with respect to the axial direction. They may also be arranged in a spiral pattern that intersects with each other. The one shown in FIG. 4 has a large number of small holes 3ba bored in the base of the stirring blade 3b shown in FIG. This rotary flow agitator 3 is
The rotating shaft 3a is located near the pickup roll 7,
Therefore, it is installed near the deepest part of the paint tank, which is comprised of one side wall formed by the pickup roll 7 and the gap structure 8, and the pan body 2. As shown in FIGS. 1 and 2, a prime mover 4 is installed on the pedestal 2e of the bread body 2 and alternately reverses the direction of rotation at predetermined time intervals.
17i!
It will be turned over. The prime mover 4 is preferably an air motor in order to avoid explosion of the highly flammable solvent vapor that evaporates along with the paint and fills the room.

The parallel flow agitator 5 consists of a shaft 5a installed parallel to the pickup roll 7 and one or more stirring plates g5b installed perpendicularly to the shaft 5a, and repeats a predetermined stroke in the axial direction to perform linear motion. There are various configurations of the parallel flow agitator 5 such as the one shown in FIG.

In the one shown in FIG. 1, the shaft 5a is a male screw 5aa rotatably supported at both ends by a support 5c, and the stirring g5
b is screwed to this at its base 5ba, and the stirring blade 5b
is engaged with a guide rod (not shown) that prevents its rotation and does not restrict movement in the direction of the shaft 5a, and the shaft 5a is connected to the prime mover 4.
By being repeatedly rotated in reverse at predetermined time intervals, the stirring blade 5b performs a linear motion by repeatedly reversing a predetermined stroke. As another example of the configuration of the parallel flow stirrer 5, if explained using FIG.
Rotation is prevented by c and the key, but it can slide in the axial direction, and a male screw is provided at the end on the motor 4 side, and it is screwed into this male screw to prevent movement in the axial direction. This nut is rotated by a prime mover 4, and a shaft 5a and a stirring blade 5b are repeatedly reversed and moved in a straight line.

The stirring blade 5b is provided perpendicularly to the shaft 5a as shown in FIG. 2, and may be a non-perforated plate as shown in FIG.
Through holes 5b of various shapes such as a), (b) and (c)
Those with holes b are preferable because they reduce ripples and foaming during stirring. Further, the shape is not particularly limited as long as it has the effect of causing parallel flow.

The parallel flow stirrer 5 is installed such that the stirring blade 5b is located above the position of the rotary flow stirrer 3.

[Action and effect]

As shown in FIG. 2, if the paint 12 is collected in the paint pan 1 according to the present invention to a level above the gap between the constricting parts 6 and the steel plate 13 is coated while simultaneously operating the two stirring devices 3 and 5,
Since the bottom plate 2a is inclined, the paint 12 easily flows in the direction of the pickup roll 7, and the rotary flow agitator 3 causes the paint 12 to flow in a deep part of the paint tank.
Since the parallel flow agitator 5 generates a parallel flow at a position equal to or higher than that position, the additive with a high specific gravity in the paint 12 is prevented from settling at the bottom of the paint tank due to the rotational flow, and is thus scraped. The raised additives are further stirred horizontally by the parallel flow, and are evenly distributed in the paint 1.
It is distributed in 2. The paint 12 homogenized in this way passes through the gap in the squeeze section 6 and passes through the pink up roll 7.
And it is applied to the steel plate 13 via the applicator roll 9. In this way, the composition of the paint in the paint tank remains uniform over a long period of time, making it possible to continuously produce coated steel sheets with a uniformly distributed coating film using additives with large specific gravity. This is possible.

[Usage examples and comparative examples]

Hereinafter, using paint pan 1 according to the present invention and other paint pans for comparison, the sedimentation status of additives with high specific gravity in paints was investigated.

25% modified silicone polyester resin paint 1 as paint
A paint containing 100 parts by weight of stainless steel powder having a specific gravity of about 7.8 was added and the viscosity was adjusted to 85 seconds using a Ford cup #4.

The paint pans used on each side were as follows.

Usage example: Paint pan 1 Comparative example 1 shown in Figures 1 and 2
: The above paint pan 1 with the parallel flow stirrer 5 removed (stirring is only by rotational flow).

Comparative Example 2: Rotary flow agitator 3 in the paint pan 1
(Agitation is only parallel flow).

Comparative Example 3: The above paint pan 1 in which both the rotary flow and parallel flow stirrers 3 and 5 were removed (no stirring).

Comparative Example 4: In Comparative Examples 1 and 2, which are examples of using a conventional bottom-feed paint tank, the rotating speed of the rotary flow agitator 3 was 60 rpm, and the rotation speed was reversed every 5 seconds, and the parallel flow agitator 5 had a reciprocating time of It was set to 10 seconds.

The pickup roll 7 was rotated in the same manner as when painting a steel plate under the above conditions, and the sedimentation status of the stainless steel powder in the paint pan was investigated. The investigation method was to observe the settling state of stainless steel powder on the bottom and inner wall of the paint pan at regular intervals, and evaluate it based on the following criteria.

4: No sedimentation at all 3: Slight sedimentation 2: Considerable sedimentation 1: Significant sedimentation The results are shown in FIG.

As can be seen from FIG. 8, when using the paint pan 1 according to the present invention, there is no sedimentation of additives with high specific gravity compared to the conventional bottom foot system, and this effect may be due to the rotational flow agitator 3 and the parallel flow agitator 5. It can be seen that this can be achieved by having both.

[Brief explanation of the drawing]

FIG. 1 is a front view of one embodiment of a paint pan with an agitating device according to the present invention, with the roll group omitted; FIG. 2 is a sectional view taken along line A-A in FIG. 1; FIGS. The figures are a partially enlarged front view showing another example of a rotary flow agitator, Fig. 5 (a),
(B) and (C) are explanatory diagrams showing the configuration of the stirring blades of the parallel flow agitator, respectively, Figure 6 is an explanatory diagram showing the bottom feed system, Figure 7 is an explanatory diagram showing the top feed system, and Figure 8 is an explanatory diagram showing the top feed system. It is a figure which shows the result of a usage example and a comparative example. 1. Paint pan with agitation device according to the present invention 2. Pan body 2a.. Bottom plate 2b.. Opposing wall 2c.. Side plate 2d.. Support portion 2e.. Frame portion 3.. Rotating agitator 3a.. Rotation. Shaft 3b... Stirring blade 3ba... Small hole 4... Prime mover 5... Parallel flow stirrer 5a... Shaft 5aa... Male thread 5b... Stirring blade 5ba... Base 5bb... Through hole 5C... Support body 6. - Squeezing section 7 - Pick-up roll 8 - Gap structure 8' - Metering roll 9 - Applicator roll 10 - Backup roll 11 - Paint tank 12 - Paint 13 - Steel plate

Claims (1)

[Claims] 1. A pick-up roll (7) that transfers the paint (12) to the applicator roll (9) in contact with the traveling steel plate (13), and a gap structure (8) provided close to the pick-up roll (7)
A paint pan constitutes a paint tank that stores paint (12) above the gap between the pick-up roll (7) and the gap structure (8), and is made up of a side wall and a pan body (2). (1), which is the bottom plate (2) of the pan body (2).
a) is inclined diagonally upward from the pickup roll (7) side, and the rotation axis (a) is parallel to the pickup roll (7).
In 3a), a stirring blade (3b) is fixed almost along the axial direction, and a rotary flow agitator (3) which rotates by repeatedly reversing the direction of rotation is located near the pick-up roll (7), and the pick-up roll Axis (5a) parallel to (7)
A parallel flow stirrer (5), which is composed of a stirrer blade (5b) installed perpendicularly to the shaft (5a) and moves linearly by reversing and repeating a predetermined stroke in the axial direction, is located at the position of the rotary flow stirrer (3). A paint pan with an agitation device, characterized in that it is installed above each of the above. 2. The paint pan with an agitation device according to claim 1, wherein the bottom plate (2a) of the pan body (2) has an inclination angle of 20° to 30° with respect to the horizontal plane. 3. The stirring device according to claim 1 or 2, wherein the stirring blade (3b) of the rotary flow stirrer (3) is a stirring blade with a large number of small holes (3ba) bored in the base. paint pan. 4 The stirring blades (5b) of the parallel flow stirrer (5) are connected to the through hole (
The paint pan with an agitation device according to any one of claims 1 to 3, which is an agitation blade having a perforation (5bb).