JPH0794024B2 - Paint pan with stirrer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to continuous coating of a steel sheet with a coating material, particularly a coating material containing an additive having a large specific gravity, while maintaining a uniform coating composition for a long time. It relates to a paint pan with a stirrer that makes it possible.

[Conventional technology]

In order to impart corrosion resistance and durability to steel sheets, and in terms of aesthetics, paint is generally applied and baked. For coating, in addition to coatings that use various synthetic resins such as boil oil that has been used for a long time and epoxy resins, polyester resins, acrylic resins, vinyl chloride resins that have been widely used in recent years as film forming substances, In recent years, paints containing an additive having a large specific gravity, such as conductive metal powder, for example, stainless steel powder, have been used to improve weldability during processing.

A roll coater is mainly used to continuously paint the steel sheet, and the roll coater is provided with a paint tank or a paint reservoir.

Hereinafter, various coating methods using a roll coater having a conventional paint tank and a paint reservoir will be outlined with reference to the drawings.

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

The bottom feed method shown in FIG. 6 is the pick-up roll 7
In addition, a metering ring 8'is provided as a gap constituent in close proximity thereto and the gap can be adjusted, and a paint tank 11 consisting of a simple container has a lower peripheral surface of the pick-up roll 7 immersed in the paint 12. The coating 12 is attached to the peripheral surface of the pick-up roll 7 by the rotation of the pick-up roll 7 and a predetermined amount of the paint 12 is passed through a predetermined gap with the meter ring 8 '(not rotating).
Is transferred to the peripheral surface of an applicator roll 9 which is provided substantially horizontally in contact with and rotates in the same direction as the pick-up roll 7, and is transferred via the upper side. The steel plate 13 is continuously coated by contacting with the steel plate.

In the top feed system shown in FIG. 7, the metering roll 8'is the applicator roll 9 of the pick up roll 7.
The rolls are arranged almost in the same way as the bottom feed type except that they are arranged at the substantially horizontal position on the opposite side to, and the paint reservoir is formed by the peripheral surfaces of the pick-up roll 7 and the metering roll 8 '. The paint 12 which has been formed is supplied and stored in the paint reservoir. Therefore, this method is not suitable for paints having low viscosity, but is suitable for high-viscosity paints such as vinyl chloride resin sol paints. In this system, each roll is rotated as shown in FIG. 7 to transfer the paint 12 and coat the steel plate 13. In this top feed system, the metering roll 8'is also rotated so that the paint 12 can easily pass through the gap between the pick-up roll 7 and the metering roll 8 '.

[Problems to be solved by the invention]

However, when the paint 12 contains an additive having a large specific gravity, the paint tank 11 and the paint reservoir as described above have the following problems.

That is, in the bottom feed method, the additive gradually settles at the bottom of the paint tank 11. Therefore, as time passes, the additive in the paint 12 applied to the steel sheet 13 via the pick-up roll 7 and the applicator roll 9 becomes small, and eventually the additive content in the paint film becomes small and the desired effect is obtained. There was a problem that would lead to the production of unpainted steel sheets.

Further, in the top feed method, the additive 12 settles down below the paint reservoir, and the paint 12 containing a large amount of the additive is the steel plate first.
Paint with low content of additives after 12
Was supplied to the steel sheet 13, that is, the distribution of the additives in the coating material 12 was not uniform, and it was not possible to finally obtain a coated steel sheet having proper coating film performance.

[Means for solving problems]

The object of the present invention is to solve the above-mentioned problems of the prior art, and to continuously plate a steel sheet in a state where a uniform coating composition is maintained for a long time even when a coating containing an additive having a large specific gravity is used. Another object of the present invention is to provide a paint pan as a means capable of forming a coating film having a uniform composition by coating on a paint pan.

That is, the present invention is composed of a pick-up roll that transfers paint to an applicator roll that is in contact with a running steel plate, and a side wall and a bread body that are formed by a gap structure provided in the vicinity of the pick-up roll, and the pick-up roll and the gap. A paint pan that composes a paint tank that holds paint above the gap between the components, and the bottom plate of the pan body is tilted obliquely upward from the pick-up roll side, and agitates on a rotating shaft parallel to the pick-up roll. A stirrer for rotating flow, in which the blades are fixed substantially along the axial direction and which rotates in a repetitive manner by reversing the rotation direction, is provided at a position in the vicinity of the pick-up roll, and a shaft parallel to the pick-up roll and perpendicular to the shaft. A stirrer for parallel flow, which is composed of stirrer blades and which linearly moves by reversing a predetermined stroke in the axial direction, is located above the position of the stirrer for rotary flow. It relates to a stirring device with coating pan, characterized in that are installed respectively.

[Description of configuration]

The present invention will be described in detail below with reference to the drawings. FIG. 1 is a front view showing a roll of a paint pan with an agitator according to an embodiment of the present invention with a roll group omitted, and FIG. 2 is a sectional view taken along line AA in FIG. 1, FIG. 3 and FIG. FIG. 5 is a partially enlarged front view showing another example of the rotary flow agitator, and FIGS. 5 (a), (b) and (c) are explanatory views showing aspects of the agitating blades of the parallel flow agitator.

In the drawings, reference numeral 1 denotes a paint pan according to the present invention, and as shown in FIG. 2, a pick-up roll 7 for transferring the paint 12 to an applicator roll 9 in contact with a traveling steel plate 13 and a pick-up roll provided in proximity thereto. The one side wall formed of the gap forming body 8 forming the narrowed portion 6 between the roll 7 and the pan body 2 constitutes a paint tank. The gap forming body 8 forms an adjustable throttle portion 6 between the gap forming roll 7 and the pick-up roll 7. A metering roll is shown in the illustrated example, but since it does not need to be rotated, it is a plate-like body such as a doctor knife. It may be. In the paint tank which is composed of the bread main body 2, the pick-up roll 7 and the gap forming body 8, the paint 12 is stored even above the throttle portion 6, and the paint having an appropriate thickness passes through the throttle portion 6. 12 is transferred from the pick-up roll 7 to the applicator roll 9 and then coated on the steel plate 13. The paint pan 1 according to the present invention has two special types of pan bodies 2 having a special structure so as to maintain a uniform paint composition for a long time even when such a paint 12 contains an additive having a large specific gravity. A rotary flow agitator 3 and a parallel flow agitator 4 for causing different paint flows are installed.

As shown in FIG. 2, in the bread body 2, the bottom plate 2a is inclined obliquely upward from the pick-up roll 7 side, and the opposite wall 2b of one side wall formed by the pick-up roll 7 and the gap forming body 8 is formed at the upper end thereof. Therefore, the vicinity of the pick-up roll 7 forms the deepest part. The inclination angle α of the bottom plate 2a is preferably 20 ° to 30 ° with respect to the horizontal plane. Bottom plate 2a
As shown in FIG. 2, side plates 2c are provided at both ends of the side wall so as to be able to come into contact with one side wall formed by the pick-up roll 7 and the gap forming body 8 to further stabilize and reinforce the installed state. A support portion 2d and a pedestal portion 2e are provided as needed.

The rotary flow stirrer 3 is composed of a rotary shaft 3a installed in parallel with the pick-up roll 7 and a stirring blade 3b fixed substantially along the axial direction. As for the mounting state of the stirring blades 3b, as shown in FIG. 1, a large number of short stirring blades 3b change their directions with respect to the axial direction at a slight inclination angle (they may be parallel).
Plural rows (four rows in the example in the figure) may be arranged in a staggered manner, and as shown in FIG.
The continuous stirring blades 3b may be arranged spirally so as to intersect with each other at different positions with a slight inclination angle with respect to the axial direction. What is shown in FIG. 4 is one in which a large number of small holes 3ba are formed in the base portion of the stirring blade 3b in FIG. This rotary flow agitator 3 has a rotating shaft 3a at a position in the vicinity of the pick-up roll 7, and accordingly a side wall formed by the pick-up roll 7 and the gap forming body 8 and a pan body 2 It is installed near the deepest part. Then, as shown in FIG. 1 and FIG. 2, the motor 4 installed on the pedestal portion 2e of the bread main body 2 which alternately inverts the rotation direction at predetermined intervals alternately inverts the rotation direction through the chain to rotate the rotation direction. Be done. As the prime mover 4, an air motor is preferable in order to avoid the explosion of highly flammable solvent vapor that volatilizes from the paint and fills the room.

The parallel-flow stirrer 5 is composed of a shaft 5a installed parallel to the pick-up roll 7 and one or more stirring blades 5b installed perpendicularly to the shaft 5a, and linearly moves by repeating a predetermined stroke in the axial direction. do. There are various configurations of such a parallel flow agitator 5. As shown in FIG. 1, the shaft 5a is a support body.
The stirring blade 5b is made up of a male screw 5aa whose both ends are rotatably supported by 5c, and is screwed to this at its base 5ba, so that the stirring blade 5b prevents its rotation and does not restrict its movement in the direction of the axis 5a. By engaging with a guide rod (not shown) and rotating the shaft 5a by the prime mover 4 at a predetermined time interval,
The stirring blade 5b makes a linear motion by reversing and repeating a predetermined stroke. Another example of the structure of the parallel flow agitator 5 will be described with reference to FIG. 1. The shaft 5a is prevented from rotating by the supporting members 5c on both sides and the key, but is slidable in the axial direction. A male screw is provided at the end on the side of the prime mover 4. The nut screwed to this male screw and prevented from moving in the axial direction is rotated by the prime mover 4 and the stirring blade 5b is repeatedly inverted together with the shaft 5a. A linear movement is shown.

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. 2, but various types as shown in FIGS. 5 (a), 5 (b) and 5 (c). Shaped through hole 5b
It is preferable that b is provided because it reduces waviness and foaming during stirring. The shape is not particularly limited as long as it has the effect of causing a parallel flow. The parallel flow stirrer 5 is installed so that the position of the stirring blade 5b is above the position of the rotary flow stirrer 3.

[Action and effect]

As shown in FIG. 2, the paint 12 is stored in the paint pan 1 according to the present invention to a position higher than the gap of the throttle portion 6, and two stirring devices 3,
If the steel plate 13 is painted while operating 5 at the same time, the bottom plate 2a
Since the paint 12 is inclined, the paint 12 easily flows in the direction of the pick-up roll 7, the rotary flow agitator 3 causes a rotary flow of the paint 12 in a deep portion of the paint tank, and the parallel flow agitator 5 equalizes its position. Since a parallel flow is generated above the above, the additive having a large specific gravity in the paint 12 is prevented from settling at the bottom of the paint tank due to the rotating flow, and the additive scraped up in this manner is further added. Due to the parallel flow, it is agitated also in the horizontal direction and is very evenly distributed in the paint 12. The paint 12 that has been made uniform in this way has the squeezing portion 6
It is applied to the steel plate 13 through the gap of (1), the pick-up roll 7 and the applicator roll 9. In this way, the composition of the paint in the paint tank maintains its uniformity over a long period of time, and it is possible to continuously manufacture coated steel sheets on which an additive having a large specific gravity or a coating film uniformly distributed is formed. You can do it.

[Example of use and comparative example]

Hereinafter, the settling state of the additive having a large specific gravity in the paint was examined using the paint pan 1 according to the present invention and other paint pans for comparison.

25% modified silicone polyester resin paint 100 as paint
1 stainless steel powder with a specific gravity of about 7.8 relative to parts by weight
The coating material added at 00 parts by weight was adjusted to a viscosity of 85 seconds with a viscosity cup # 4 and used.

The paint pan used in each example is as follows.

Example of Use: Paint Pan 1 Shown in FIGS. 1 and 2 Comparative Example 1: The above paint pan 1 without the stirrer 5 for parallel flow (stirring is only for rotary flow).

Comparative Example 2: The paint pan 1 with the rotary flow agitator 3 removed (only parallel flow is agitated).

Comparative Example 3: The above-mentioned paint pan 1 without the agitators 3 and 5 for both rotary flow and parallel flow (without stirring).

Comparative Example 4: Conventional bottom feed type coating tank 11 In the usage example and Comparative Examples 1 and 2, the rotary flow agitator 3 is used.
The rotation speed of 60 rpm was reversed every 5 seconds, and one reciprocating time of the stirrer 5 for parallel flow was 10 seconds.

The pick-up roll 7 was rotated in the same manner as the case of coating a steel plate under the above conditions, and the sedimentation state of the stainless steel powder in the paint pan was investigated. As for the investigation method, the settling state of the stainless steel powder on the bottom and inner wall of the paint pan was observed at regular intervals and evaluated according to the following criteria.

4: No sedimentation 3: Slight sedimentation 2: Fair sedimentation 1: Significant sedimentation The results are shown in Fig. 8.

From FIG. 8, when the paint pan 1 according to the present invention is used as compared with the conventional bottom feed method, there is no sedimentation of the additive having a large specific gravity, and this effect is obtained by using either the rotary flow agitator 3 or the parallel flow agitator 5. It can be seen that it can be obtained by also having.

[Brief description of drawings]

FIG. 1 is a front view showing a roll of a paint pan with an agitator according to an embodiment of the present invention with a roll group omitted, and FIG. 2 is a sectional view taken along line AA in FIG. 1, FIG. 3 and FIG. The figure is a partially enlarged front view showing another example of the rotary flow agitator, FIG. 5 (a),
(B) and (c) are explanatory views showing aspects of the stirring blades of the parallel flow agitator, FIG. 6 is an explanatory view showing a bottom feed system, FIG. 7 is an explanatory view showing a top feed system, and FIG. 8 is an example of use. FIG. 5 is a diagram showing the results of a comparative example. 1 ... Paint pan with a stirrer according to the present invention 2 ... Pan body 2a ... Bottom plate 2b ... Opposing wall 2c ... Side plate 2d ... Support part 2e ... Stand part 3 ... Rotating agitator 3a ... Rotation Shaft 3b …… Stirring blade 3ba …… Small hole 4 …… Motor 5 …… Parallel flow stirrer 5a …… Shaft 5aa …… Male screw 5b …… Stirring blade 5ba …… Base 5bb …… Through hole 5c …… Support 6… … Squeezing part 7 …… Pickup roll 8 …… Gap structure 8 ′ …… Meter ring roll 9 …… Applicator roll 10 …… Backup roll 11 …… Paint tank 12 …… Paint 13 …… Steel plate

Claims (4)

[Claims] 1. A pick-up roll (7) for transferring a paint (12) to an applicator roll (9) in contact with a running steel plate (13), and a gap structure (8) provided in the vicinity thereof. A paint pan (1) comprising a side wall configured as described above and a pan body (2) and forming a paint tank for accumulating the paint (12) above the gap between the pick-up roll (7) and the gap forming body (8). The bottom plate (2a) of the bread body (2) is inclined obliquely upward from the pick-up roll (7) side, and the stirring blade (3b) is attached to the rotary shaft (3a) parallel to the pick-up roll (7). A stirrer (3) for rotation flow, which is fixed substantially along the axial direction and rotates in a repetitive manner by reversing the rotation direction, is located in the vicinity of the pick-up roll (7), and an axis (5a parallel to the pick-up roll (7)). ) And perpendicular to the axis (5a) A parallel flow agitator (5), which is composed of an agitating blade (5b) and linearly moves by reversing a predetermined stroke in the axial direction, is installed above the position of the agitator for rotary flow (3). A paint pan with a stirrer. 2. The paint pan with a stirrer 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 blade (3b) of the rotary flow stirring machine (3) according to claim 1 or 2, wherein the stirring blade has a plurality of small holes (3ba) formed in the base portion. Paint pan with stirrer. 4. The stirring blade (5b) of the stirrer (5) for parallel flow is a stirring blade having a through hole (5bb) formed therein, according to any one of claims 1 to 3. A paint pan with a stirrer according to.