JPH0652965U - Backup roll resin removal device for resin coater - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a resin removing device for a backup roll for a resin coater, which can completely remove the resin liquid adhering to the backup roll provided below the coater before being transferred from the backup roll to the back surface of the steel sheet. To do. A backup roll 1 provided below a coater 16 for coating a resin liquid 2, and a solvent tank 31 arranged below the backup roll 1 and storing a solvent 34 for the resin.
And a brush roll 32 or a blade knife 36 which is brought into contact with the backup roll 1 in the solvent tank 31.
Etc., and a wiper 33 pressed against the roll surface of the backup roll 1 that has passed through the resin removal means, and a part of the backup roll 1 was immersed in the solvent in the solvent tank.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to the improvement of workability in a resin coater for producing a surface-treated steel sheet in which a resin as a coating material is applied to a steel sheet surface or a composite steel sheet in which a resin is sandwiched between two steel sheets. In particular, the present invention relates to a resin removing apparatus for a backup roll for a resin coater, which can reduce defects such as coating thickness deviation due to resin leaked from the coater.

[0002]

[Prior art]

 The technique of applying a coating material such as resin to the steel plate surface is essential in the coating process of a corrosion-resistant paint in the production of surface-treated steel plates such as painted steel plates, and the liquid adhesive coating process in the production of composite steel plates. For example, Japanese Patent Application Laid-Open No. 3-193341 filed by the present applicant discloses a facility for manufacturing a composite steel plate in which a resin containing a conductive filler is sandwiched between two steel plates. As shown in FIG. 3, this is one steel plate S sent from the uncoiler 11a.₁And the other steel plate S sent from the other uncoiler 11b₂And S are degreased in the degreasing tank 12, chromate-treated in the chromate processing tank 13 and dried in the drying device 14 in separate processing lines, and then one of the steel plates S ₁ Then, a liquid resin mixed with a conductive filler is uniformly applied to the bonding surface by a spray coater 15. The other steel plate S₂In this case, only the resin not mixed with the conductive filler is applied to the pasting surface with a knife coater 16 to a predetermined film thickness. After coating, both steel plates S dried through separate drying devices 17₁, S₂Through a common degassing roll 19 and a heating and pressure bonding roll 20 to form a single composite steel plate S.₃It is wound on the winder 21 as.

[0003]

[Problems to be solved by the device]

As shown in FIG. 4, the knife coater 16 used as a coater for coating a synthetic resin on the surface of the steel plate in the above-mentioned conventional example is a coating material on the steel plate S ₂ supported by the backup roll 1 as shown in FIG. A dam 3 filled with the resin liquid 2 is provided, and a blade 5 having a slit 4 is provided on the steel plate exit side of the dam 3 and between the steel plate S _{2 and} the surface to be coated. The coating thickness is controlled by adjusting the blade 5 to adjust the opening interval H of the slits 4, which is suitable for thick coating.

However, the dam 3 filled with resin liquid 2 because it is fixed to the top of the steel plate S _2, the bottom of the dam 3 when the steel plate S ₂ meanders are relatively displaced in the width direction. If the change is large, the resin liquid 2 in the dam 3 finally leaks out of the width of the steel plate. Alternatively, if the setting of the dam 3 itself is improper, the resin liquid 2 may leak. Then, the resin liquid 2 leaked to the outside of the steel plate adheres to the backup roll 1 and, as a result, the following problems occur.

The resin liquid 2 adhering to the backup roll 1 is transferred to the back surface of the steel plate S _{2 and} the appearance of the product is impaired. Since the resin liquid 2 is interposed between the backup roll 1 and the steel plate S ₂ , the opening distance H of the slit 4 between the blade 5 of the coater and the steel plate S ₂ varies in the plate width direction. Variation causes product defects.

Therefore, the present invention has been made in view of such conventional problems. The resin liquid adhered to the backup roll provided below the coater is transferred from the backup roll to the back surface of the steel sheet. It is an object of the present invention to solve the above-mentioned conventional problems by providing a resin removing means for completely removing the resin before the above.

[0007]

[Means for Solving the Problems]

 The present invention that achieves the above object is to provide a backup roll provided below a coater for coating a resin liquid, a solvent tank disposed under the backup roll for storing the solvent of the resin, and a solvent tank inside the solvent tank. In the above, there is provided a resin removing means which is brought into contact with the backup roll and a wiper which is pressed against the roll surface of the backup roll which has passed through the resin removing means, and a part of the backup roll is immersed in the solvent in the solvent tank. It is characterized by that.

A brush roll or a blade knife can be used as the resin removing means.

[0009]

[Action]

 In the present invention, the resin liquid adhering to the backup roll is dissolved or swollen with the solvent of the resin, so that it can be easily and completely removed. As the solvent, for example, thinner or methyl ethyl ketone (MEK), which has a strong dissolving power, is particularly effective. That is, the backup roll to which the resin liquid has adhered is soaked at its lower part in a solvent in a solvent tank and mechanically scraped off with a brush roll or a blade knife which is brought into contact with the backup roll in the solvent. Therefore, the adhered resin can be reliably removed from the backup roll surface.

Then, the solvent remaining on the surface of the backup roll immediately after passing through the solvent is completely removed by a fixed wiper. This keeps the roll surface dry before the backup roll contacts the back surface of the steel material again, and prevents stains such as stains from remaining on the back surface of the steel sheet. Since the material of the brush roll or blade knife used as the resin removing means of the present invention is always immersed in the solvent, plastic having high chemical resistance is suitable. For example, Teflon (trade name), etc. Particularly preferred are tetrafluoroethylene-based fluororesins, ultra-high-density polyethylene and the like.

When a brush roll is used, the brush may rotate in any direction, but when the brush roll is rotated in the same direction as the rotation direction of the backup roll, the backup roll surface and the bristle tips of the brush roll come into contact with each other. It becomes a passing direction, which is preferable from the viewpoint of resin removal effect.

[0012]

【Example】

 Hereinafter, embodiments of the present invention will be described with reference to the drawings. In this embodiment, the resin removing apparatus for a backup roll for a resin coater of the present invention is applied to a liquid adhesive coating process in a composite steel sheet production line. It should be noted that the same or corresponding parts as those of the conventional one are denoted by the same reference numerals, and duplicated description will be omitted.

FIG. 1 schematically shows an embodiment of a resin removing device 30 of the present invention, which is a back-up roll of a knife coater 16 for applying a resin liquid 2 which is a liquid adhesive to a steel plate S _2. It is arranged below 1. The resin removing device 30 includes a solvent tank 31 arranged below the backup roll 1, and a brush roll 32 as a resin removing means rotatably arranged in the solvent tank 31 and brought into contact with the backup roll 1. The fixed wiper 33 is pressed against the surface of the backup roll 1 after coming into contact with the brush roll 32.

The solvent tank 31 stores an amount of solvent 34 in which the entire brush roll 32 and the lower portion of the backup roll 1 are immersed. The solvent 34 is a volatile solvent capable of dissolving or swelling the synthetic resin used in the resin liquid 2 applied to the steel plate S ₂ , and in this embodiment, thinner or MEK is used. The brush roll 32 is made of Teflon, and is rotated in the arrow Y ₁ direction by a rotation driving device (not shown). As a result, the contact area with the backup roll 1 per unit time increases, and the resin removal capacity increases.

The wiper 33 is also made of Teflon, and is arranged so as to press the wiper blade at a position immediately after the surface of the backup roll 1 after coming into contact with the brush roll 32 leaves the liquid surface of the solvent 34. . The solvent 34 itself volatilizes completely even if it adheres to the steel plate S ₂ , but the resin in the resin liquid 2 dissolves and accumulates gradually, and the resin may remain on the steel plate surface and contaminate it. It has the function of completely removing the solvent 34 remaining on the No. 1 surface and keeping it in contact with the steel sheet in a dry state at all times.

Next, the operation will be described. Steel plate S₂When the bottom of the dam 3 of the knife coater 16 largely changes in the width direction due to the meandering or the like, the resin liquid 2 in the dam 3 leaks out of the width of the steel plate. The leaked resin 2A adheres to the peripheral surface of the backup roll 1. Backup roll 1 is arrow Y ₂ Rotate in the same direction. The liquid leakage resin 2A that has adhered eventually reaches the solvent 34 stored in the solvent tank 31 of the resin removing device. Then, the adhered liquid leakage resin 2A begins to dissolve or swell due to the action of the solvent 34. Almost at the same time, the brush roll 32 scrapes the dissolved or swollen resin 2A from the backup roll surface. In this case, the moving directions of the peripheral surface of the backup roll and the bristle tips of the brush roll 32 pass each other, so that the liquid leakage resin 2A that has adhered very effectively is removed from the peripheral surface of the backup roll 1. .

The surface of the backup roll 1 from which the liquid leakage resin 2A has been removed then proceeds in the solvent 34 for a while, during which the remaining portion of the adhered liquid leakage resin 2A is completely washed off from the roll surface, and eventually. The solvent 34 goes out of the liquid surface. At this time, the solvent 34 is attached to the peripheral surface of the backup roll 1. The adhering solvent 34 is scraped off by the blade of the wiper 33, which is pressed against the peripheral surface of the backup roll 1 just above the liquid surface. The backup roll 1 thus kept in a clean and dry state continues to rotate, reaches the lower surface side of the steel plate S ₂ again, and supports it.

Thus, before the backup roll comes into contact with the back surface of the steel material again, the roll surface is kept in a dry state, and dirt does not remain on the back surface of the steel plate as in the conventional case. Thus, resin liquid adhesion resin liquid of the backup roll 1 is transferred to the rear face of the steel plate S ₂ Toka product appearance is impaired, the steel sheet S ₂ opening distance H of the slit 4 of the coater by adhering the resin fluctuates 2 It is possible to prevent problems such as uneven coating thickness and defective products.

FIG. 2 shows another embodiment. In this embodiment, a blade knife 36 made of Teflon is used instead of the brush roller 32 used as the resin removing means in the first embodiment. An experiment of removing the adhered resin was carried out for the one using the brush roll 32 as the resin removing means and the one using the blade knife 36. As a result, the resin liquid 2 was a polyester resin (viscosity 10 ² centipoise) which is a low-adhesive resin. When used, no difference in removal ability was observed between the two.

On the other hand, when a polyester resin (viscosity 10 ⁴ centipoise), which is a highly tacky resin, is used, the rotary brush roll 32 has a slightly higher removal capacity than the one using the blade knife 36. Admitted. This is considered to be because the rotating brush roll has a larger contact area with the peripheral surface of the backup roll per unit time than the fixed blade knife 36.

Although Teflon is used as the material of the brush roll 32 and the blade knife 36 in each of the above-described embodiments, other than that, for example, ultra-high-density polyethylene or the like, the point is that it has a high solvent resistance. good. Further, although the wiper 33 of the above-mentioned embodiment has been described as a fixed type, it may be a movable type which is reciprocally slidable in the longitudinal direction of the backup roll 1 by using an eccentric motor or the like.

Further, the present invention is not limited to being applied only to a knife coater, and can be suitably used for a roll coater and other types of coating devices.

[0023]

[Effect of device]

 As described above, according to the present invention, the backup roll provided below the coater for coating the resin, the solvent tank disposed under the backup roll for storing the solvent of the resin, and the solvent tank It is equipped with a resin removing means such as a brush roll or a blade knife that is in contact with the backup roll inside, and a fixed wiper pressed against the roll surface of the backup roll that has passed through the resin removing means. It was immersed in the solvent in the solvent tank. Therefore, the resin liquid leaking from the coater and adhering to the backup roll can be removed immediately before it is transferred from the backup roll to the back surface of the steel sheet by using a solvent and a mechanical means together. There is no problem that the leaked resin liquid is transferred to the back surface of the steel plate or the coating thickness varies, and the product of good quality can be obtained.

[Brief description of drawings]

FIG. 1 is a structural layout view of an embodiment of the present invention.

FIG. 2 is a structural layout view of another embodiment of the present invention.

FIG. 3 is a line configuration diagram showing an example of a production line for a composite steel sheet.

FIG. 4 is a structural layout view of a knife coater for coating a steel plate.

[Explanation of symbols]

 1 Backup Roll 2 Resin Liquid 16 Coater 30 Resin Removal Device 31 Solvent Tank 32 Resin Removal Means (Brush Roll) 33 Wiper 34 Solvent 36 Resin Removal Means (Blade Knife)

Claims (3)

[Scope of utility model registration request] 1. A backup roll provided below a coater for coating a resin liquid, a solvent tank arranged below the backup roll and storing a solvent for the resin, and a backup roll in the solvent tank. A backup roll for a resin coater, which is provided with a resin removing means for impregnating and a wiper pressed against the roll surface of the backup roll that has passed through the resin removing means, wherein a part of the backup roll is immersed in the solvent in the solvent tank. Resin removal device. 2. The resin removing device for a backup roll for a resin coater according to claim 1, wherein the resin removing means is a brush roll. 3. The resin removing device for a backup roll for a resin coater according to claim 1, wherein the resin removing means is a blade knife.