JP3180917B2 - Strip application method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a surface-treated steel sheet in which a coating or resin is applied to the surface of a strip by a roll coater method.

[0002]

2. Description of the Related Art Generally, in a coating line in which a paint or a resin (hereinafter simply referred to as paint) is applied to the front and back surfaces of a strip by a roll coater method, first, as shown in FIG. And then the backside coater 7 is used to coat the strip backside 1
The method of performing coating b is used.

In this method, in the surface coating, the strip 1 is wound around a fixed backup roll 12, and the applicator roll 3 of the surface coater 2 is pressed sufficiently strongly against the backup roll 12. Because it can be applied, stable coating can be achieved. However, at the time of back coating, the back surface coater 7 cannot use the backup roll 13 for supporting the strip 1 because the paint applied by the front coater 2 is not dried on the front surface 1a of the strip 1. Therefore, the pressing pressure of the back coater against the strip 1 of the applicator roll 8 is
Is limited by the tension of

FIG. 8 is a view showing the state of the paint at the time of application near the applicator roll 8 in the back coater 7. The paint 14 carried by the transfer roll 9 to the applicator roll 8 is coated on the strip 1. Reference numeral 15 denotes a coating film coated on the strip.
When the pressing pressure of the applicator roll 8 against the strip 1 is insufficient, the ratio of the leak paint 16 that slips through between the strip 1 and the applicator roll 8 and adheres to the applicator roll 8 again increases, and the The obtained film thickness controllability cannot be obtained.

As a means for solving the insufficient pressing pressure of the applicator roll 8 against the strip 1 in the backside coating, a double-sided simultaneous coater in which the front coater 2 and the back coater 7 are arranged at the same position as shown in FIG. used. This technique is disclosed in, for example, Japanese Patent Publication No. Sho 57-36024, Japanese Utility Model Publication No. Sho 63-69583, and Japanese Patent Publication No. Sho 58-1987.

The double-sided simultaneous coater is characterized in that the applicator rolls 3 and 8 of the front coater 2 and the back coater 7 are in contact with the strip 1 interposed therebetween, and the other applicator roll holds the strip 1 in each. The applicator rolls 3 and 8 are sufficiently pressed against the strip 1 to obtain stable coating film thickness control characteristics.

However, in the simultaneous double-side coater, there is an advantage that the pressing pressure of the applicator rolls 3 and 8 against the strip 1 can be sufficiently increased, but the following problems remain. FIG. 10 and FIG. 11 are views showing the state of the paint at the time of application near the applicator roll in the simultaneous double coater.

FIG. 10 is a cross-sectional view of a portion where the strip 1 is located between the applicator roll 3 of the front coater 2 and the applicator roll 8 of the back coater 7, and shows a case where a good coating film is formed. FIG. However, in the portion outside the width of the strip 1 shown in FIG. 11, the paint which is originally applied to the surface of the strip 1 and carried away (FIG. 10)
Part 15) accumulates between the applicator roll 3 of the front coater 2 and the applicator roll 8 of the back coater 7 (part 17 in FIG. 11). As a result, the coating adheres to the strip edge portion in an amount larger than a predetermined amount, causing a quality problem. FIG. 12 is a diagram showing the distribution of the amount of paint applied to the strip in the width direction of the strip, but the amount of adhesion at the edge portion is excessive.

When the paint pool 17 in FIG. 11 becomes larger, the paint may flow down. The problem of the paint pool described above occurs not only in the double-sided coating but also in the single-sided coating. Conventionally, as a countermeasure, the paint on the roll is scraped off in accordance with the width of the plate, or one of the rolls is moved in the axial direction to align the roll end with the plate end.

[0010] However, all of these measures require the addition of a dedicated device, have insufficient effects, and have the disadvantage that the paint pool at the edge cannot be accurately controlled.

[0011]

SUMMARY OF THE INVENTION An object of the present invention is to provide a method for applying a strip which solves the problems of the prior art.

[0012]

According to a first aspect of the present invention, there is provided a method for simultaneously applying a coating material or a resin to the front and back surfaces of a continuously running strip by a roll coater method. Within, the rotation axes of the front and back roll coaters cross each other and the width of the strip
In the outer part of the surface coater applicator row
And the applicator roll of the back coater do not touch
This is a strip coating method characterized by providing a gap between the two to prevent overcoating of paint or resin at the strip edge.

According to a second aspect of the present invention, there is provided a method of applying a paint or resin to one surface of a continuously running strip by a roll coater method, wherein the rotation of the roll coater is performed in a plane parallel to a plane where the roll coater and the strip are in contact. the rotation axis of the shaft and the backup roll crossed each other, the strip
Applicator roll and bag
There is a gap between the two without the cup roll touching
The present invention is a method for applying a strip, characterized in that overcoating of paint or resin at a strip edge portion is prevented.

[0014]

According to a first aspect of the present invention, there is provided a method for simultaneously applying a paint or resin to the front and back surfaces of a continuously running strip by a roll coater method. By intersecting the rotation axes of the roll coater at a predetermined intersection angle, the applicator roll of the front coater and the applicator roll of the back coater do not contact each other at the outer part of the width of the strip. Can be created. As a result, surplus paint (part number 17 in FIG. 11) between the applicator rolls is discharged through this gap, so that a uniform paint adhesion amount can be obtained over the entire area in the strip width direction.

According to a second aspect of the present invention, there is provided a method of applying a paint or a resin to one surface of a continuously running strip by a roll coater method, wherein the rotation axis of the roll coater is set within a plane parallel to a plane where the roll coater and the strip are in contact. And the rotation axis of the backup roll intersect each other at a predetermined intersection angle, thereby creating a state in which a gap is provided between the applicator roll and the backup roll without contact with each other in a portion outside the width of the strip. be able to. This makes it possible to obtain a uniform amount of paint applied over the entire area in the strip width direction as in the first invention.

[0016]

An embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a side view of a double-sided simultaneous coater embodying the first invention, and FIG. 2 is a plan view. The surface coater 2 has a mechanism capable of giving a rotation angle about a rotation axis indicated by A. The back coater 7 is not provided with a mechanism for giving a rotation angle. In this embodiment, the rotation axis center A is set at the center of the applicator roll 3 of the surface coater 2. Although an actuator for giving a rotation angle to the surface coater 2 is not shown, a hydraulic cylinder, a motor and a jack may be used.

FIG. 3 is a plan view when the surface coater 2 is given a rotation angle θ in this embodiment. In this case, in a portion other than the rotation center A, the surface applicator roll 3
And the center of rotation of the back applicator roll 8 intersects planarly. FIG. 4 is a cross-sectional view of the strip 1 within the plate width. As a result of giving the rotation angle θ, a shift amount shown in B occurs.

FIG. 5 is a cross-sectional view of the strip 1 on the outer side of the width of the strip 1, in which a shift amount C similarly occurs. As a result, as shown in FIG.
A gap D is provided between the applicator roll 3 of the front coater 2 and the applicator roll 8 of the back coater 7. As the surplus paint passes through the gap D and is discharged,
It is possible to prevent the accumulation of paint between the applicator rolls 3 and 8, and it is possible to obtain a uniform amount of paint applied over the entire width of the strip 1 as shown in FIG.

In setting the rotation angle θ, the rotation angle is set to a minimum rotation angle required for discharging the surplus paint from the outer portion of the strip 1 so as to be effective without affecting the paint adhesion amount in the strip width direction. Function can be obtained. In the present embodiment, the case where the rotation angle is given to the front coater 2 has been described, but the same effect can be obtained when the rotation angle is given to the back coater 7.

Next, the second invention is applied to a single-side coating system which is not a simultaneous double-side coater as shown in FIG.
The rotation axis of the surface roll coater 2 and the rotation axis of the backup roll 12 intersect each other at a predetermined intersection angle in a plane parallel to the plane where A state can be created in which a gap is provided between the backup roll 3 and the backup roll 12 without contact. This makes it possible to obtain a uniform amount of paint applied over the entire area in the strip width direction, similarly to the first invention.

[0021]

As described above, according to the present invention,
Since it becomes possible to prevent the accumulation of paint on the applicator roll, it is possible to obtain a uniform amount of paint applied over the entire width of the strip.

[Brief description of the drawings]

FIG. 1 is an explanatory view schematically showing an embodiment of the first invention.

FIG. 2 is a plan view schematically showing one embodiment of the first invention.

FIG. 3 is a plan view schematically showing one embodiment of the first invention.

FIG. 4 is a cross-sectional view showing a state of application of a paint according to the first invention.

FIG. 5 is a cross-sectional view showing a state of application of a paint in the first invention.

FIG. 6 is a diagram showing a distribution of the amount of paint applied to a strip in a plate width direction in the first invention.

FIG. 7 is a schematic explanatory view of a one-sided coating system to which the second invention is applied.

FIG. 8 is a cross-sectional view showing a state of application of a paint in a conventional one-side coating method.

FIG. 9 is a schematic explanatory view of a conventional double-side coating method.

FIG. 10 is a cross-sectional view showing an applied state of a paint in a conventional double-sided coating method.

FIG. 11 is a cross-sectional view showing a coating state of a paint in a conventional double-side coating method.

FIG. 12 is a diagram showing a distribution of the amount of paint applied to a strip in a board width direction in a conventional double-side coating method.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Strip 1a Strip surface 1b Strip back surface 2 Front coater 3 Applicator roll 4 Transfer roll 5 Pickup roll 6 Paint pan 7 Back coater 8 Applicator roll 9 Transfer roll 10 Pickup roll 11 Paint pan 12 Backup roll 13 Backup roll 14 Paint 15 Paint film 16 Leak paint 17 Paint pool

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-61-274765 (JP, A) JP-A-1-207157 (JP, A) JP-A-54-118442 (JP, A) 1987 (JP, B2) Jiko 41-13332 (JP, Y1) (58) Fields investigated (Int. Cl. ⁷ , DB name) B05D 1/28 B05C 1/08

Claims (2)

(57) [Claims] 1. A method of simultaneously applying a coating material or a resin to the front and back surfaces of a continuously running strip by a roll coater method, wherein a rotation axis of the front and back surface roll coaters is set in a plane parallel to a plane where the roll coater and the strip are in contact with each other. At the outer part of the width of the strip.
Applicator roll and back coater applicator
A method of applying a strip, characterized in that a gap is provided between the two without contacting the rolls , thereby preventing overcoating of paint or resin at the strip edge. 2. A method of applying a paint or a resin to one surface of a continuously running strip by a roll coater method, wherein a rotation axis of the roll coater and a backup roll are fixed in a plane parallel to a plane where the roll coater and the strip contact. The axes of rotation intersect each other and are outside the width of the strip
The applicator role and backup roll
A method of applying a strip, characterized in that a gap is provided between the two without being in contact with each other to prevent overcoating of paint or resin at the strip edge.