JPH0559697A - Spray coating equipment - Google Patents

Abstract

PURPOSE:To provide the title equipment designed to afford a sheet's surface with non-spray coated parts by installing an air nozzle to eject high-pressure air on both the ends in proximity to a backing roller and a rod blade. CONSTITUTION:Both the ends of a rod holder 9 supporting a rod blade 3 are equipped with brackets 6 with their upper surfaces in proximity to the surface of a backing roller 2. An air nozzle 5 is piped inside the brackets and high- pressure air is ejected through the nozzle on both the ends of a sheet 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used in the field of a smearing device for forming non-smeared portions on both ends of a sheet in a smearing step of smearing a paint on a sheet manufactured through a papermaking step.

[0002]

2. Description of the Related Art A sheet manufactured by a papermaking process is wound around an unwinder (large winding roll), and a sheet unwound from the unwinder is used for a heat-sensitive paint or the like in the next smearing process. Appropriate paint is smeared, then dried in the drying process, the surface is smoothed in the subsequent calendering process, and then divided into winders (small winding rolls) to be wound according to various uses. It has become. Then, 10 to 15 mm at both ends of the sheet are slit in the course of these steps, so that fine paper called ear paper is generated. The generated selvage paper becomes waste paper, but especially waste paper containing heat-sensitive paint is discarded because it cannot be used as recycled paper with the current technology. However, the heat-sensitive paint smeared on the ear paper is expensive, and discarding them causes enormous loss.

Further, in the smearing process, when the sheet smeared over the entire width passes through the subsequent drying process, both ends of the sheet are instantaneously stretched to cause a curl phenomenon, and the curl to the side opposite to the smearing side. There was a problem that tearing and tearing occurred, causing paper to run out.

In order to solve such a problem, in the smearing process, the sheet and the applicator roll are provided at both ends of the sheet passed between the backing roll (pressing roll) and the applicator roll (coating roll). About 30 to 5 in the narrow space of about 300 to 400 μm between
By arranging thin plates each having a thickness of 0 μm and inserting them so that about 10 to 15 mm of both ends of the sheet overlap with the thin plates, the thin plates can transfer the paint on the surface of the applicator roll to both ends of the sheet. The present applicant has proposed a technique in which non-smear portions are formed on both ends of the sheet, which is limited (Japanese Patent Application No. 2-10317).
No. 5).

However, in the method of inserting the thin plate between the applicator roll and the sheet, the inserted thin plate is pressed by the pressure of the paint on the surface of the applicator roll with the increase of the smearing speed, and the surface of the backing roll and the sheet is The sheet will be pressed strongly, causing the surface of the backing roll to be worn and the sheet to be damaged, and the large friction between the thin plate and the backing roll will cause the thin plate to be attached to the mounting holder and the base of the mounting holder. When the mounting on the table was weak, an accident occurred in which the thin plate was pulled between the backing roll and the applicator roll and was seriously damaged.

Further, as a result of forming the non-smear portion on the sheet by the thin plate, the smear portion is in a wet state on the paper surface and the backing roll surface, whereas the non-smear portion is in a dry state. Wear occurs on the surface of the backing roll in contact with these at the boundary between the uncoated part and the non-smeared part, and as a result, over time, the part corresponding to that boundary of the sheet is applied to the worn part of the backing roll surface. There is a problem in that the paint is transferred, smeared, and wound in this state to cause so-called winding thickening.

[0007]

As is apparent from the above description, as a method of forming a non-smear portion on the surface of a sheet, the conventional method has been to solve the problem by mechanical contact means, so that the above-mentioned problems occur. It was.

Therefore, it is an object of the present invention to form a non-smear portion on the surface of a sheet without using mechanical contact means.

[0009]

According to the present invention, in claim 1, the sheet 1 which has been subjected to the smearing step is provided between the backing roll 2 and the rod blade 3 as indicated by the reference numeral of the embodiment. In a smearing device in which the thickness of the paint 4 smeared on the sheet 1 is adjusted by passing it or the smeared surface is finished to be smooth, the backing roll 2 and the rod blade 3 are close to both ends of the sheet 1. do it,
The present invention relates to a smearing device provided with air nozzles 5 for ejecting high-pressure air toward both ends of the sheet 1.

According to the second aspect of the invention, the sheet 1 which has undergone the smearing step is backed by a backing roll 2 and a rod blade 3.
In the smearing device in which the thickness of the paint 4 smeared on the sheet 1 is adjusted by passing it between the sheet 1 and the smoothing finish of the smearing surface, a backing roll 2 and a rod blade are provided near both ends of the sheet 1. 3 is provided with air nozzles 5 for ejecting humidified air toward both ends of the sheet 1 and the backing rolls 2 in the vicinity thereof.

In the third aspect, the air nozzle 5 is attached to a mounting bracket 6 adjacent to the backing roll 2 and the rod blade 3, and the inside of the mounting bracket 6 is covered with a surface 2a of the backing roll 2.
The smearing device according to claim 1 or 2, wherein the smearing device is arranged along the side.

Further, according to claim 4, the air nozzle 5
The clearance between the mounting bracket 6 in which is embedded and the surface 2a of the backing roll 2 facing the mounting bracket 6 is 0.5 to
It is 3 mm, and the clearance between the ejection port 5a of the air nozzle 5 and the surface 3a of the load blade 3 which faces the ejection port 5a is 1.5 to 5 mm.

Further, according to a fifth aspect, the air nozzle 5
5. The smearing device according to any one of claims 1 to 4, wherein the ejection port 5a is inclined with respect to the surface 3a of the rod blade 3 by 45 degrees to 80 degrees in a plan view.

In the sixth aspect, the air nozzle 5
Relates to the smearing device according to any one of claims 1 to 5, wherein the mounting bracket 6 is piped in a jacket manner.

Further, in claim 7, the sheet 1 on which the coating material 4 is smeared by passing between the applicator roll 8a and the backing roll 2 is provided by the rod blade 3 provided corresponding to the backing roll 2. In a so-called rod blade coater in which the amount of paint 4a applied to the sheet 1 is measured, high pressure air or humidified air is applied to both ends of the sheet in the vicinity of both ends of the sheet 1 in proximity to the backing roll 2 and the rod blade 3. A configuration is adopted in which an air nozzle 5 that ejects toward the portion is arranged.

[0016]

According to the first aspect of the present invention, the air nozzle 5 for ejecting high-pressure air toward both ends of the sheet 1 in the vicinity of both ends of the sheet 1 and near the backing roll 2 and the rod blade 3. Therefore, the paint 4 smeared on both ends of the sheet 1 in the previous smearing process is blown off by the high pressure air ejected from the air nozzle 5, and the non-smeared parts 7 are formed on both ends of the sheet 1. It is formed.

According to the second aspect of the present invention, the humidified air is directed to both ends of the sheet 1 and the backing rolls 2 near the ends of the sheet 1 in the vicinity of the backing roll 2 and the rod blade 3 near both ends of the sheet 1. Air nozzle 5 jetting
The humidifying air is supplied to the backing roll 2 because
It is jetted into a narrow space surrounded by the rod blade 3 and the air nozzle 5 to prevent the paint from entering the narrow space, and in particular, the surface 2a of the backing roll 2 is humidified to prevent the paint from adhering to it. Will be done. This action particularly results in a clearance of 0.5 to 3 between the mounting bracket 6 in which the air nozzle 5 is built in and the surface 2a of the backing roll 2 facing the mounting bracket 6 as described above.
mm, and the clearance between the ejection port 5a of the air nozzle 5 and the surface 3a of the rod blade 3 which faces the ejection port 5a is formed in a narrow space of 1.5 to 5 mm, which is more remarkable.

In the third aspect of the present invention, the air nozzle 5 is attached to the mounting bracket 6 adjacent to the backing roll 2 and the rod blade 3, and the inside of the mounting bracket 6 is covered with the surface 2a of the backing roll 2.
The pipe is arranged along the side, and particularly, as shown in claim 6,
The air nozzle 5 is jacketed inside the mounting bracket 6 so that a film of water is generated on the surface of the mounting bracket 6 facing the backing roll 2 by the cooling action of the fluid flowing in the air nozzle 5. The water film prevents dust in the air from entering the narrow space and reliably prevents the backing roll 2 and the surface of the sheet 1 from being contaminated.

Further, according to a fifth aspect, the air nozzle 5
Since the direction of the ejection port 5a of the is inclined 45 degrees to 80 degrees in plan view with respect to the surface 3a of the rod blade 3,
The high-pressure air ejected from the air nozzle 5 is evenly blown onto the surfaces of the sheet 1 and the backing roll 2,
The non-smeared portions 7 on both ends of the sheet 1 are uniformly formed.

Further, according to the present invention, since the paint on both ends of the sheet is peeled off to form the non-smear portion immediately after the paint is smeared on the sheet, the non-smear portion can be easily formed. Can be done quickly.

[0021]

EXAMPLE FIG. 1 shows a state in which a base paper 1 which is a sheet that has undergone a papermaking process is continuously passed from a smearing process A to a non-smearing part forming process B of the present invention. , The base paper 1 is passed between the applicator roll 8a (coating roll) and the backing roll 8b (pressing roll), whereby the thick paint 4 is smeared on the base paper 1 and the subsequent non-smear portion formation In step B, the base paper 1 is passed between the backing roll 2 and the rod blade 3 to scrape off the thick paint 4 on the rod blade 3,
The smeared surface of the base paper 1 is formed into a smooth smeared surface 4a having a constant thickness. The scraped off paint is of course reused.

FIG. 2 shows the arrangement positions of the air nozzles 5 as the non-smeared part forming means in the non-smeared part forming step B. Both ends of the base paper 1 passing between the backing roll 2 and the rod blade 3 are shown. The air nozzle 5 is disposed in the vicinity of the portion, and the paint 4 on both ends of the base paper 1 is peeled off by the high pressure air ejected from the air nozzle 5 to form the non-smear portion 7.

Specifically, as shown in FIG. 3, at both ends of the rod holder 9 supporting the rod blade 3, the upper surface side is close to the surface of the backing roll 2, and the tip end surface is the surface of the rod blade 3. Adjacent mounting brackets 6 and 6 are provided, and an air nozzle 5 is piped inside the mounting bracket 6 so as to extend along the upper surface side of the mounting bracket 6. At this time, as shown in FIG. Clearance C1 between the upper surface of the mounting bracket 6 in which the
Is 0.5 to 3 mm, and the clearance C2 between the ejection port 5a of the air nozzle 5 opening on the front surface of the mounting bracket 6 and the surface 3a of the load blade 3 facing this is set to 1.5 to 5 mm. And is surrounded by the backing roll 2, the rod blade 3, and the mounting bracket 6 and faces the ejection port 5a of the air nozzle 5, and the narrow space 13
Is formed.

The two mounting brackets 6 and 6 can be moved and adjusted along the rod holder 9 by a well-known means such as bolting to a long hole, and the ejection port 5a of the air nozzle 5 can be adjusted. It is provided so as to be located approximately 10 to 15 mm closer to the center from both ends of the base paper 1. The supply pipe 10 of the air nozzle 5 has a merging portion 10a in the middle thereof, and an air pipe 11 for supplying high-pressure air and a water pipe 12 for supplying water merge with the merging portion 10a to pass through the air nozzle 5 from the supply pipe 10. Humidified air is ejected from the ejection port 5a toward both ends of the base paper 1. The air supplied from the air pipe 11 is preferably about 3.5 to 6 kg / cm ² , and the water supplied from the water pipe 12 is preferably about 1.5 to 3.0 cc per minute.

The pressure of the high-pressure air from the air tube 11 and the ratio of air to water are adjusted according to the types of the base paper 1 and the paint 4 smeared on the base paper 1.

Further, as shown in FIG. 5, the mounting bracket 6
The jet nozzle 5a of the air nozzle 5 which is piped inside is provided with an inclination angle α of 45 ° to 80 ° in plan view with respect to the surface 3a of the rod blade 3, and the mounting bracket 6
The humidified air jetted from the jet port 5a is evenly distributed to the front surface of the base sheet 1 near the both ends of the base paper 1 and the surface of the backing roll 2 (FIG. 3) in the vicinity thereof. A notch 14 cut in a substantially triangular shape is formed.

Therefore, the high-pressure air ejected from the ejection port 5a of the air nozzle 5 is blown to both ends of the base paper 1, so that the paint 4 applied to both ends of the base paper 1 in the previous smearing step is The paint 4 which is blown off by the high pressure air and smeared on the base paper 1 as shown in FIG.
Non-smeared portions 7 (shown by blank spaces) are formed on both ends of (shown by a chain line). The paint 4 peeled off from the base paper 1 in this way is, of course, reused.

Further, since the humidified air is jetted into the narrow space 13 surrounded by the backing roll 2, the rod blade 3 and the air nozzle 5, the paint is prevented from entering the narrow space 13 and, in particular, the backing roll 2 is used. The surface 2a of the above is set in a humidified state to prevent the coating material from adhering thereto. This action is particularly because the clearance between the mounting bracket 6 having the built-in air nozzle 5 and the surface 2a of the backing roll 2 facing the mounting bracket 6 is 0.5 to 3 mm. The clearance with the surface 3a of the opposing rod blade 3 is 1.5 to
By being formed in the narrow space 13 of 5 mm, it becomes more prominent.

The air nozzle 5 is piped inside the mounting bracket 6 along the front surface 2a of the backing roll 2, and the air nozzle 5 is piped inside the mounting bracket 6 in a jacketed manner. A water film is formed on the surface of the mounting bracket 6 facing the roll 2 by the cooling action of the fluid flowing in the air nozzle 5, and this water film prevents dust in the air from entering the narrow space. Backing roll 2 and base paper 1
Will certainly prevent the surface of the soil from being soiled.

As shown in FIG. 6, when a fountain type smearing device in which the applicator roll 15, the backing roll 16 and the applicator roll 15 are provided with a paint outlet slit 17 in the smearing process, the fountain type smearing device is used. The thin plate 18 described at the beginning is inserted between the base paper 1 and the paint blowing slit 17 at both ends of the base paper 1 to be formed, and non-smear portions are formed at both ends of the base paper 1 in this smearing step as much as possible. It is preferable to do so. Furthermore, as shown in FIG. 1, also in the embodiment of the present invention, the doctor blade 19 is brought into contact with both ends of the applicator roll 8 to prevent the coating material 4 from being applied to this portion, By preventing transfer of the coating material on the applicator roll 8 to both end portions of No. 1 in advance, the formation of the non-smeared portion is further ensured.

Further, FIG. 7 shows another embodiment of the present invention. In the previous embodiments, as shown in FIG. 1, a smearing step A and a non-smearing part forming step B are included. In the apparatus, the non-smearing part forming device is provided in the non-smearing part forming process B, but in this embodiment, the non-smearing part forming device is directly provided in the smearing process A.
That is, the applicator roll 8a and the backing roll 2
Base paper 1 smeared with paint 4 by passing between
However, in a so-called rod blade coater in which the coating amount of the coating material 4a applied to the base paper 1 is measured by the rod blade 3 provided corresponding to the backing roll 2, the backing roll 2 and the backing roll 2 are provided near both ends of the base paper 1. An air nozzle 5 for ejecting high-pressure air or humidified air toward both ends of the base paper 1 is provided in the vicinity of the rod blade 3. This air nozzle 5 is built in the above-mentioned mounting bracket 6 and is provided so as to face the rod blade 3 mounted on the rod holder 9, and its detailed structure is the same as that of the above-mentioned embodiment.

In this embodiment, since the non-smear portion forming device is directly provided in the smearing step, the structure is simply that much.

[0033]

As described above, according to the present invention, claim 1
In such a case, the paint applied to both ends of the sheet in the previous applying process is blown off by the high-pressure air ejected from the air nozzles, so that the non-application part is formed at both ends of the sheet by the non-contact means. Since no mechanical contact pressure is applied to the sheet or backing roll, the sheet or backing roll is not scratched and can be used stably for a long period of time.

In the second aspect, the humidified air is jetted into the narrow space surrounded by the backing roll, the rod blade and the air nozzle to prevent the paint from entering the narrow space, and particularly the backing roll. The surface of the product is humidified to prevent the paint from adhering to it, and it has the effect of reliably preventing the backing roll from becoming dirty during use. Transferred to the sheet,
It does not cause the phenomenon of so-called winding.
This effect is particularly due to the fact that the clearance between the mounting bracket having the built-in air nozzle and the surface of the backing roll facing the mounting bracket is 0.5 to 3 mm. When the clearance between the surface of the load blade and the surface of the load blade is formed in a narrow space of 1.5 to 5 mm, it is more significantly exhibited.

According to the third or sixth aspect of the invention, a water film is formed on the surface of the mounting bracket facing the backing roll by the cooling action of the fluid flowing in the air nozzle, and this water film forms a film of water in the air. It is possible to prevent dust from entering the narrow space and reliably prevent the surface of the backing roll or the sheet from being contaminated, and from this aspect, it is possible to stably produce a high-quality sheet.

According to a fifth aspect of the present invention, the high pressure air ejected from the air nozzle 5 is evenly blown onto the surface of the sheet and the backing roll to form the non-smear portions at both ends of the sheet uniformly. No paint can remain.

Further, in the seventh aspect, since the non-smear portion forming device is directly formed in the smearing step, the structure thereof is simple and it can be manufactured at a relatively low cost.

[Brief description of drawings]

FIG. 1 is a schematic side view of an embodiment of the present invention.

FIG. 2 is a schematic plan view of an embodiment of the present invention.

FIG. 3 is a perspective view of an embodiment of the present invention.

FIG. 4 is a side view of a main part of the embodiment of the present invention.

FIG. 5 is a plan view of an essential part of an embodiment of the present invention.

FIG. 6 is a side view showing an example of a smearing device which is a pre-process of the present invention.

FIG. 7 is a schematic side view of another embodiment of the present invention.

[Explanation of symbols]

 1 sheet (base paper) 2 backing roll 3 rod blade 4 paint 5 air nozzle 6 mounting bracket 7 non-smeared part 8 applicator roll 9 rod holder 10 supply pipe 11 air pipe 12 water pipe 13 narrow space

Claims (7)

[Claims] 1. A smearing device for adjusting the thickness of paint smeared on a sheet by passing the sheet that has been subjected to the smearing step between a backing roll and a rod blade, and for finishing the smearing surface smoothly. 2. A smearing device comprising an air nozzle for ejecting high-pressure air toward both ends of the sheet in the vicinity of both ends of the sheet, near the backing roll and the rod blade. 2. A smearing device for adjusting the thickness of the paint smeared on the sheet by passing the sheet that has been subjected to the smearing step between a backing roll and a rod blade, and for smoothing the smeared surface. 2. A smearing device, wherein air nozzles for ejecting humidified air toward the backing rolls at both ends of the sheet and in the vicinity thereof are provided near the backing roll and the rod blade near both ends of the sheet. 3. The air nozzle is attached to a mounting bracket adjacent to the backing roll and the rod blade, and the inside of the mounting bracket is piped along the surface side of the backing roll. Smearing device. 4. The clearance between the mounting bracket containing the air nozzle and the surface of the backing roll facing the mounting bracket is 0.5 to 3 mm, and the jet nozzle of the air nozzle and the surface of the rod blade facing it. The smearing device according to claim 3, wherein the clearance with is 1.5 to 5 mm. 5. The smearing device according to claim 1, wherein the jet nozzle of the air nozzle is provided so as to be inclined with respect to the surface of the rod blade by 45 ° to 80 ° in plan view. 6. The smearing device according to claim 1, wherein the air nozzle is provided inside the mounting bracket in a pipe-like manner. 7. A so-called rod blade coater in which a sheet smeared with paint by passing between an applicator roll and a backing roll is measured by a rod blade provided in correspondence with the backing roll. A smearing device, in which air nozzles for ejecting high-pressure air or humidified air toward both ends of the sheet are provided near both ends of the sheet, near the backing roll and the rod blade.