JP2002248394A - Coating pan - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a coated product having a coating film surface free from defects such a streak pattern or the entanglement of foreign substance by controlling the flowing state of a coating in a coating pan. SOLUTION: The coating pan 10 houses the coating to be applied on a material to be coated from a pickup roll 2 through an applicator roll, an inlet side partition plate 15 which has a surface part facing one side surface of the pickup roll 2 dipped in the coating P and an edge adjacent to a front wall surface 11 of the coating pan 10 in the inlet side zone C, an outlet side partition plate 16 which has the both side edges adjacent respectively to another side surface of the pickup roll 2 and to the left wall surface 13 of the coating pan in the outlet side zone D, and a return flow preventing weir 17 between a front zone F and a coating discharge zone V are arranged. Then, the flow of the coating is controlled to be in one direction and the coating is applied on the material to be coated with a uniform coating quantity.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a paint pan for a roll coater which can suppress coating film defects caused by poor flow of a paint.

[0002]

2. Description of the Related Art When a long object to be coated such as a steel strip running continuously is coated by a roll coater, the coating material P stored in a coating pan 1 is lifted by a pickup roll 2 and applied to the object by an applicator roll 3. (FIG. 1). The paint P is supplied from the pump 4 to the vicinity of one side surface of the pickup roll 2 in the paint pan 1 via the hose 5. The paint P sent to the paint pan 1 circulates through the paint pan 1 and is discharged from a discharge port 6 located near the other side surface of the pickup roll 2.

The paint P in the paint pan 1 is picked up.
Associated flow due to rotation of Prowl 2₁And feed from hose 5
Feed flow f₀The flow state where the flow pressure of the
(FIG. 2). In the vicinity of the pickup roll 2, the direction a
By-pass flow f accompanying roll rotation ₁From forward zone F
The paint P flows into the rear zone B. Into the rear zone B
Paint P collides with the rear wall surface 1b of the paint pan 1 and
Change the flow in the direction. In FIG. 2, the rightward flow f_TwoIs
Flow toward the hose 5 through one side of the cup roll 2
Move leftward flow f_ThreeIs the other side of pickup roll 2
It flows toward the outlet 6 through the surface.

[0004]

The paint P is a highly viscous liquid. Therefore, in a portion where the rotational force of the pickup roll 2 and the pressure of the pump 4 do not affect, the force for flowing the paint P hardly occurs, and the paint stagnation portion D is easily generated inside the paint pan 1. In the paint stagnation section D, since the same paint P stays for a long time due to little circulation of the paint, the paint P is separated or dried to generate paint scum or bubbles. When paint scum or foam is sent out from the paint stagnation section D due to the flow fluctuation of the paint P and is re-engaged with the pickup roll 2, it is taken in as a defect in a coating film formed on the surface of a long workpiece to be coated such as a steel strip.

Further, the right flow f ₂ is between one side of the right wall 1r and pickup roll 2 of the paint pan 1 toward the hose 5 to flow back f _7, fed forward zone F again. The leftward flow f ₃ also flows between the left wall surface 11 of the paint pan 1 and the other side surface of the pickup roll 2, and then partly circulates to the front zone F ₈ . Regurgitation f ₇ and swirling flow f ₈ is the feed stream f ₀
, The amount of the paint P is partially increased. The partial increase in the amount of the paint P causes a change in the distribution of the paint lifted by the pickup roll 2 in the roll axis direction and, consequently, the distribution in the width direction of the object to be coated.

[0006]

DISCLOSURE OF THE INVENTION The present invention has been devised to solve such a problem, and includes a weir for regulating the flow direction of a paint in a paint pan, thereby improving the paint quality. An object of the present invention is to provide a paint pan which can secure a directional flow and can apply a paint to an object to be coated with a uniform application amount in a width direction.

[0007] In order to achieve the object, the present invention provides a paint pan for containing a paint to be applied to an object to be coated from a pick-up roll via an applicator roll, wherein one side of the pick-up roll is immersed in the paint. The input side partition plate whose edge is close to the front wall surface of the paint pan is on the paint supply side of the paint pan, and both side edges are close to the other side surface of the pickup roll and the left or right wall surface of the paint pan. The exit-side partition plate is disposed on the paint discharge side, and the flow-prevention weir that partitions the paint discharge zone from the front zone between the front wall surface and the pickup roll is disposed on the paint discharge side, and is partitioned by the exit-side partition plate and the flow-prevention weir. A paint outlet is opened at the bottom of the paint pan in the paint discharge zone. The gap along the liquid surface of the paint from the front wall surface to the peripheral surface of the pickup roll is preferably set small so that the accompanying flow of the paint generated by the rotation of the pickup roll becomes faster.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In a paint pan 10 according to the invention, FIG.
As shown in the figure, the front wall surface 11 and the rear wall surface 12 are brought close to the roll peripheral surface of the pickup roll 2. Further, a front zone F between the front wall surface 11 and the pickup roll 2 is partitioned by an inlet partition plate 15 on the hose 5 side (paint input side) and by a circulation prevention weir 17 on an outlet 6 (paint discharge side). ing. A zone between the rear wall surface 12 and the pickup roll 2 is a rear zone B.

The entrance-side partition plate 15 is a floating weir (FIG. 3B) separated from the bottom surface of the paint pan 10 by a floating gap d ₃ .
The surface portion faces one side surface (entrance side) of the pickup roll 2, and the edge portion is arranged in a state of being close to or in contact with the front wall surface 11 of the paint pan 10. The circulation prevention weir 17 is a weir (FIG. 3d) standing upright from the bottom surface of the paint pan 10.
A front zone F and a paint discharge zone V are partitioned. The circulation prevention weir 17 has a liquid level adjustment function so that a required amount of the paint P is held in the front zone F. When the paint P having a large viscosity is used, the circulation preventing weir 17 can be omitted.

A rear zone B between the pickup roll 2 and the rear wall surface 12 communicates with an outlet zone D between the other side surface (output side surface) of the pickup roll 2 and the left wall surface 13. The outlet zone D and the paint discharge zone V are partitioned by an outlet partition plate 16 rising from the bottom surface of the paint pan 10 (FIG. 3c). The exit side partition plate 16 has one edge close to the other side surface of the pickup roll 2 and the other edge close to or in contact with the left wall surface 13 of the paint pan 10. The paint discharge zone V includes the outlet partition plate 16 and the circulation prevention weir 1.
7 separates the paint pan 10 from the internal space.

Most of the paint P sent from the hose 5 to the paint pan 10 is supplied to the entrance zone C between one side surface and the side wall surface (the right wall surface 14 in FIG. 4) of the pickup roll 2 by the entrance partition plate 15. It flows as a flow f _0. Some of the paint P is submerged the inlet side partition plate 15, flows into the front zone F becomes forward flow f _4, are fed to the rear zone B as accompanying flow f ₁ by the rotation of the pickup roller 2. The paint P adhering to the pickup roll 2 is transferred to an applicator roll (not shown), and is transferred to an object to be coated.

The front gap d ₁ from the roll peripheral surface of the pickup roll 2 to the front wall surface 11 and the rear gap d ₂ from the rear wall surface 12 along the liquid surface of the paint P have a sufficient flow rate due to the rotation of the pickup roll 2. It is set so as accompanying flow f ₁ occurs less. Accompanying flow f ₁ by the collision to the rear wall 12 is shunted to the right flow f ₂ and leftward flow f _3, and one side of the pickup roller 2 most of the supplied paint P becomes the feed stream f ₀ since the flow between the right wall 14, the right flow f ₂ is canceled by the feed stream f _0. As a result, a unidirectional flow along the wall surface of the paint pan 10 (a counterclockwise flow in FIG. 4) occurs, and the paint stagnation portion D
(FIG. 2) does not occur.

[0013] leftward flow f ₃ flows toward the outlet side zone D from the rear zone B, and exit-side partition plate 16 and overflow f ₅ flows into the paint discharge zone V (Fig. 3c). In the paint discharge zone V, the discharge port 6 is opened at the bottom surface of the paint pan 10, so that the paint P flowing into the paint discharge zone V is returned from the paint pan 10 to the paint tank via the discharge port. Also,
Between the front zone F and the paint discharge zone V
7, there is no circulating flow f ₈ (FIG. 2) from the paint discharge zone V to the front zone F.

Thus, the paint P in the paint pan 10
Is regulated by the entrance partition plate 15, the exit partition plate 16, and the circulation prevention weir 17, so that the paint P flows in the paint pan 10 as a one-way flow, and the paint P There is no paint stagnation D which causes foreign matter to be entrained. Further, since the amount of the paint P lifted from the paint pan 10 by the pickup roll 2 is made constant in the axial direction of the pickup roll 2 and, consequently, in the width direction of the object to be coated, the generation of the streak pattern S is also suppressed.

The depth of the paint P held in the front zone F is determined by the height of the flow preventing weir 17. That is, when an excessive amount of the paint P is sent to the paint pan 10, the excess overflows f ₆ through the circulation prevention weir 17 and flows out to the paint discharge zone V. Therefore, the paint P held in the front zone between the front wall surface 11 and the pickup roll 2 has a constant liquid level L.
(FIG. 3d), the coating material P lifted by the pickup roll 2 under stable conditions is applied to the object to be coated by the applicator roll, and a coating film with a small thickness variation is formed.

[0016]

As described above, in the paint pan of the present invention, the front zone between the pickup roll and the front wall surface is partitioned by the floating-type entrance partition plate and the upright-type flow prevention weir, and the paint is discharged. The space is divided by a circulation prevention weir and an outgoing partition plate. Therefore, the fed paint flows in the paint pan as a one-way flow, and is supplied from the pickup roll to the workpiece through the applicator roll. Further, the circulation of the paint sent to the rear wall side by the pickup roll to the front zone is prevented by the circulation prevention weir. Therefore, a uniform amount of paint is applied to the object to be coated in the width direction, and coated products such as coated steel sheets having a sound surface with no streak pattern, paint residue, air bubbles, etc. are manufactured. Is done.

[Brief description of the drawings]

FIG. 1 is a plan view (a), II sectional view (b) and II-II sectional view (c) of a conventional paint pan in which a pickup roll is immersed.

FIG. 2 is a diagram illustrating a flow state of paint in a conventional paint pan.

FIG. 3 is a plan view (a), i of a paint pan in which an inlet-side partition plate, an outlet-side partition plate, and a circulation prevention weir are arranged according to the present invention;
-I sectional view (b), ii-ii sectional view (c) and iii-iii sectional view (d)

FIG. 4 is a view for explaining a flow state of paint in the paint pan.

[Explanation of symbols]

2: Pickup roll 10: Paint pan 11:
Front wall 12: Rear wall 15: Incoming partition
16: outlet side partition plate 17: Circulating dam d _1: pickup roll 2 and the front wall 11 forward gap between d _2: rear gap P between the pickup roll 2 and the rear wall 12: Paint f _0: supply Flow f ₁ : Associated flow f ₂ : Rightward flow f ₃ : Leftward flow f ₄ : Forward flow f ₅ , f ₆ : Overflow f ₇ : Circulation D: Paint stagnant portion S: Streak-like pattern V: Paint discharge zone

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Ya Sakashita 7-1 Takayashinmachi, Ichikawa-shi, Chiba Prefecture Nisshin Steel Corporation Ichikawa Works (72) Inventor Norika Tamura 7-1 Takayashinmachi, Ichikawa-shi, Chiba Nisshin Steel Co., Ltd. Ichikawa Works (72) Inventor Masayuki Tarumi 7-1 Takaya Shinmachi, Ichikawa City, Chiba Prefecture Nisshin Steel Co., Ltd. Nisshin Steel Corporation Ichikawa Works (72) Inventor Kenichi Ito 7-1 Takaya Shinmachi, Ichikawa City, Chiba Prefecture Nisshin Steel Corporation Ichikawa Works (72) Inventor Hitoshi Higuchi 7-1 Takaya Shinmachi, Ichikawa City, Chiba Prefecture F-term in Nisshin Steel Corporation Ichikawa Works (reference) 4F040 AA22 AB04 AC01 BA24 BA35 CB22 4F042 AA22 AB00 CB02 CB24 DD46

Claims (2)

[Claims] 1. A paint pan for containing a paint to be applied to an object to be coated from a pick-up roll via an applicator roll, wherein a surface portion of the paint pan is opposed to one side surface of the pick-up roll immersed in the paint. The entrance partition plate whose edge is close to the front wall surface is on the paint supply side of the paint pan, and the exit partition plate whose both edges are close to the other side surface of the pickup roll and the left or right wall surface of the paint pan is on the paint discharge side. , A flow prevention weir that separates the paint discharge zone from the front zone between the front wall surface and the pickup roll is arranged on the paint discharge side,
A paint pan, wherein a paint outlet is opened at the bottom of a paint pan in a paint discharge zone defined by an outlet-side partition plate and a flow prevention weir. 2. The paint pan according to claim 1, wherein a gap between the front wall surface and the peripheral surface of the pickup roll along the liquid level of the paint is set small so that the accompanying flow of the paint caused by the rotation of the pickup roll is increased.