JP4839576B2 - Coating method for strips - Google Patents

Description

The present invention relates to a manufacturing technology of the strip, about the coating how to strip traveling. This technique is, for example, a technique for achieving uniform coating in a manufacturing process of a non-oriented electrical steel strip or the like.

  Conventionally, as a means for coating the surface of a traveling strip generally with a surface coating substance, paint, chemical reaction agent, etc., the strip is immersed in a bath, sprayed onto the surface of the strip, a roll coater or a brush There are various means such as applying a coating solution using the like.

  Among these various means, in the technique using a roll coater, when a low-viscosity coating liquid is used when roll-coating the strip, a uniform coating layer is formed due to insufficient wettability of the strip. However, there is a problem that uneven coating tends to occur.

  In order to solve this problem, there is a technique for improving the wettability of the belt-like body by placing a precoat nozzle immediately before the applicator roll of the roll coater to wet the belt-like body (see, for example, Patent Document 1). .

The precoat nozzle is composed of, for example, a hollow pipe having nozzle holes with a diameter of several tens mm and a pitch of several tens mm in the plate width direction, and is arranged so that the axial direction of the hollow pipe is orthogonal to the longitudinal direction of the strip-shaped body. The belt is arranged close to the surface of the belt-like body, and has a structure in which a felt-like brush is attached in the vicinity of the nozzle hole along the plate width direction. By continuously supplying the precoat liquid to the nozzle, the strip can be wetted over the entire width.
Japanese Patent No. 2823956 (page 1-2, FIG. 1)

  However, in the above technique, since the position of the nozzle hole is fixed, there is a problem that the width edge portion of the band does not get wet when the width of the band increases, and conversely the width of the band In the case where the width of the belt-shaped body becomes narrow, the width edge portion of the belt-like body is excessively wetted, resulting in an excessive coating film thickness.

  As a measure to remedy this problem, there is a technology to install a plate that shields the nozzle hole at the width edge part according to the width of the band, but a simple device could not keep up with frequent changes in the width of the band. .

The present invention is in the art of using the precoat nozzle roll coating of the strip, it is an object to provide a coating how you to prevent coating unevenness that occurs when the sheet width change.

The present invention has been made in order to solve the above-mentioned problems, and is a coating method on a belt-like body characterized by taking the following technical means. That is, the present invention uses a precoat nozzle for coating the traveling belt-like body, and the precoat nozzle is provided with a slit-like opening extending in the width direction of the belt-like body, and the length of the slit-like opening is set. and 50mm~700mm shorter than the plate width of the strip, to supply the pre-coating liquid gaps between edges of the slit-shaped openings of the precoat nozzle and the strip as 0.5 mm to 5 mm, a length of the slit-shaped opening Protruding walls that are close to the belt-like body along the length and longer than the slit-shaped opening are provided on both sides of the slit-shaped opening, and the coating liquid that has exited from the slit-shaped opening flows as a flow toward the longitudinal direction of the slit-shaped opening. This is a method for coating a belt-like body, which is characterized in that after pre-coating, coating with a roll coater is performed.

  In the present invention, it is possible to prevent the coating film thickness from being excessively formed at the edge in the width direction of the belt-like body by making it shorter than the plate width of the strip-like body having the minimum width that passes through the length of the slit-like opening, and the slit-like opening. Uniform coating of the precoat liquid is achieved by guiding the precoat liquid coming out of the belt in the width direction of the strip.

The equipment which is Ru can be present method preferably implemented has a width direction and a slit-shaped opening which is disposed substantially parallel to the strip running the length of the slit-shaped opening is variably formed It was a flop-les-coat nozzle. As a technique for changing the length of the slit-shaped opening, a known means may be used. For example, it can be easily realized by means such as attaching a sliding movable lid to the slit-like opening, and the change of the length of the slit-like opening can be automatically changed according to the plate width of the belt-like body. A known ordinary technique may be applied.

  Further, if the precoat nozzle is characterized in that the gap between the strip and the edge of the slit-like opening is variably formed, the viscosity of the pre-coating liquid, the coating amount, the moving speed of the strip, etc. This is preferable because it can be used with an optimum gap corresponding to the above conditions. The means for changing the gap between the belt-like body and the edge of the slit-like opening can be easily realized by providing a minute height raising / lowering device for the precoat nozzle.

  It is preferable to provide standing walls adjacent to the belt-like body along the length direction of the slit-like opening on both sides of the slit-like opening so that the pre-coating liquid coming out of the slit is directed in the longitudinal direction of the slit.

  According to the present invention, even if there is a variation in the width of the belt-like body, the pre-coating liquid can be supplied uniformly in the width direction to achieve an excellent effect that a uniform wet state can be realized.

  A slit-shaped opening is provided in the width direction of the precoat nozzle, the gap with the band-shaped body is brought close to 0.5 to 5 mm, and coating is continuously applied between the nozzle and the band-shaped body by continuously supplying the coating liquid. Form a liquid flow. This makes it possible to wet the strip uniformly regardless of the width of the strip.

  FIG. 6 shows an overall side view of a roll coater to which the present invention is applied. The roll coater device includes a rotating immersion roll 111 immersed in the coating liquid 110 and a rotating applicator roll 112 in contact with the rotating immersion roll 111. The applicator roll 112 transfers the coating liquid adhering to its surface to the surface of the traveling strip 100. The uniformizing roll 113 makes the coating liquid thickness adhering to the surface of the rotary dipping roll 111 uniform. In such a roll coater, a precoat nozzle 10 is disposed upstream of the roll coater in order to ensure a uniform thickness of the coating layer applied to the strip 100 and prevent coating unevenness. The precoat nozzle 10 applies a precoating liquid to the surface of the strip 100 in advance. Conventionally, the precoat nozzle is configured to eject the precoating liquid from the small pores, but there is a problem that the distribution of the precoating liquid in the width direction of the belt-like body becomes non-uniform.

  The inventors changed the nozzle hole of the precoat nozzle 10 to a slit-like opening that is long in the width direction of the band, and further forms a flow of the coating liquid in the width direction of the band, thereby causing fluctuations in the width of the band. It has been found that even in such cases, the strips can be supplied uniformly.

  Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic perspective view showing a method for coating a belt-like body according to an embodiment of the present invention, and shows a precoat nozzle 10. In the method for coating a belt-like body of the present invention, a precoat nozzle 10 having a slit-like opening 20 is used.

  The slit-shaped opening 20 has a shape that is long in a direction substantially perpendicular to the longitudinal direction of the strip-shaped body 100, and the longitudinal dimension of the slit-shaped opening is shorter than the plate width of the strip-shaped body 100.

  FIG. 2 shows the precoat nozzle 10 in which standing walls 30 extending in the longitudinal direction are provided on both lateral edges of the slit-shaped opening 20. The pre-coating liquid exiting from the slit-shaped opening 20 of the pre-coat nozzle 10 is guided by the standing wall 30 and flows in the longitudinal direction of the pre-coat nozzle 10. Therefore, a uniform pre-coating can be applied.

  FIG. 3 does not attach the standing wall 30 as shown in FIG. 2, but provides the slit-like opening 20 and the groove 31 extending to the side thereof, resulting in the same effect as the standing wall 30 shown in FIG. The side wall 32 which produces | generates is formed. Such a side wall is also regarded as a standing wall in the present invention.

  FIG. 5 shows a cross section of the precoat nozzle 10 according to the embodiment, and includes a standing wall 30 or a side wall 32 on both sides of the slit-shaped opening 20, and the top of the standing wall 30 or the side wall 32 and the belt-like body 100. The gap 50 between the two is made variable. That is, the pre-coating liquid is guided and guided in the longitudinal direction of the slit-shaped opening 20 by raising and lowering the position in the height direction of the pre-coating nozzle as shown by an arrow 51 and using a known means.

  FIG. 4 shows this state, and the pre-coating liquid 40 supplied to the pre-coating nozzle 10 exits from the slit-shaped opening 20 and is then uniformly applied to the surface of the band-shaped body 100 as indicated by an arrow 41. That is, the slit-shaped opening 20 is provided in the width direction of the strip-shaped body 100 of the pre-coat nozzle 10 and is close to a range where the gap between the strip-shaped body 100 and the edge of the slit-shaped opening 20 is 0.5 to 5 mm. By continuously supplying the liquid, a flow of the pre-coating liquid is formed in the strip width direction of the strip, so that even if the strip width varies, the surface of the strip can be uniformly wetted. It became so.

Using flop les coating nozzle, the application of the present invention a method for continuous annealing line of the non-oriented electrical steel strip.

  As a result, the conventional steel sheet that had a yield loss of 0.28% due to scraping and overcoating due to coating unevenness obtained a good result with almost no yield loss.

It is a typical perspective view of the precoat nozzle of an Example. It is a typical perspective view of the precoat nozzle of an Example. It is a typical perspective view of the precoat nozzle of an Example. It is a longitudinal cross-sectional view of the precoat nozzle of an Example. It is a cross-sectional view of the precoat nozzle of an Example. It is explanatory drawing of a roll coater apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Precoat nozzle 20 Slit-like opening 30 Standing wall 31 Groove 32 Side wall 40 Pre-coating liquid 41 Arrow 50 Gap 51 Arrow 100 Strip-shaped body 110 Coating liquid 111 Rotating immersion roll 112 Applicator roll 113 Homogenizing roll

Claims (1)

When coating the traveling strip, a precoat nozzle is used, and the precoat nozzle is provided with a slit-shaped opening extending in the width direction of the strip-shaped body, and the length of the slit-shaped opening is set to the plate width of the strip-shaped body. 50 mm to 700 mm shorter, supplying the precoat liquid with the gap between the strip and the edge of the slit-like opening of the precoat nozzle set to 0.5 mm to 5 mm ,
Protruding walls that are close to the belt-like body along the length direction of the slit-like opening and have a length longer than the slit-like opening are provided on both sides of the slit-like opening, and the coating liquid that has come out of the slit-like opening is provided in the slit-like opening. A method for coating a belt-like body, comprising pre-coating as a flow in the longitudinal direction and then coating with a roll coater.

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