JP2001079477A - Paper pass direction changing device for coated paper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To install a drier above a curtain coater by a constitution wherein a coated paper coated with a coating color by the curtain coater is bent to a top face side to be a coated face. SOLUTION: An air floater 17 for bending a coated paper 2a that has been coated with a coating color by a curtain coater 3 upward before being dried is provided on a downstream side of the curtain coater 3. A guide roll 18 is provided at a position diagonally upward on the downstream side of the air floater 17. A drier 9 is provided on the downstream side of the guide roll 18. A coated face side of the coated paper 2a coated with the coating color 7 by the curtain coater 3 is guided in non-contact by the air floater 17 so as to be lead to the drier 9 in a paper pass direction oriented upward so that the drier 9 can be installed at a high position.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a method for coating a coating film in the form of a curtain film directly dropped from a coating head on the surface of a base paper produced in a paper mill. The present invention relates to an apparatus for changing the direction of a paper path of a coated paper used for changing the paper path of a coated paper in an undried state after application of a processing color to a coating surface side.

[0002]

2. Description of the Related Art Paper manufactured in a paper mill is not immediately used as it is, but may be used as a base paper for further processing to obtain a processed paper as a product meeting a required purpose. Many. There are various types of processed paper, one of which is coated paper (coated paper). Coated paper is manufactured by applying a coating color (coating liquid) to the paper surface for the purpose of improving the properties of the paper surface, and there is a coating apparatus as the apparatus.

As one type of coating apparatus, a base paper which is made to flow (fall under its own weight) by a coating color from a coating head (liquid supply head) in the form of a curtain film and is wound around a coater roll and travels. A so-called curtain coater is known in which a coating color is directly applied to the surface of a base paper when passing through a curtain film of the coating color.

In the above-mentioned curtain coater, since the coating color is formed into a curtain film and is directly applied to the surface of the base paper, the paper path at the position where the curtain film passes is slightly higher on the downstream side.

Conventionally, paper coated with a coating color by the curtain coater is guided to a dryer through a guide roll to perform a drying process. However, the coating color is coated by the curtain coater. Until the undried coated paper is guided to the dryer, the guide roll cannot be installed on the coated surface in order to prevent damage to the coated surface (surface). When the paper path is changed to guide the coated paper to the dryer, a guide roll as a paper path changing device is arranged on the side opposite to the coating surface, and therefore, inevitably, the guide roll in the undried state The paper path of the coated paper can be changed only downward, so that the dryer is installed at a lower position.

As an example, there is a coated paper manufacturing equipment using a conventional curtain coater as shown in FIG. That is, a rewinding machine (front equipment) 1, a curtain coater 3, a dryer 9 and a winding machine (rear equipment) 10 are arranged side by side in order, and the base paper 2 rewound from the rewinding machine 1 and sent rightward is arranged. When the paper path is guided to the curtain coater 3 by being hung on the guide roll 14, the upper side of the base paper 2 is wrapped around the guide roll 4 so that the paper path is directed upward at the entrance side of the curtain coater 3, and the paper path is once set. After the direction is changed upward, the base paper 2 is wrapped around the coater roll 5 and the base paper 2 is caused to travel so that the paper path is slightly inclined upward toward the downstream side. The coating color 7 that has flowed down is applied directly, and then the coating paper 2a that has been coated with the coating color 7 by the curtain coater 3 and is in an undried state is placed on the back side of the coating paper 2a ( Anti-coated surface)
While the paper path direction is maintained substantially horizontal by the guide rolls 8 arranged so as to be in contact with the drying roller 9, the coating color 7 is dried by passing through the drying machine 9, and thereafter, Coated paper 2b with dry coated surface
Is wound on a winder (rear surface equipment) 10 via a guide roll 15.

However, the equipment shown in FIG. 5 has a problem that the line length is long, the equipment area is large, and a large building is required.
A two-story facility as shown in FIG. 6 has been proposed. That is, first, the base paper 2 unwound from the rewinding machine 1 installed on the first floor portion is first transferred to the guide roll 1 installed on the second floor portion.
1, the paper path is pulled up to the second floor, the paper path is wound on the guide roll 14 so that the paper path is substantially horizontal in the second floor, and then the base paper 2 is placed on the second floor. A guide roll 4 and a coater roll 5 are wrapped around the curtain coater 3 and guided, and a coating film 7 in the form of a curtain film dropped from a coating head 6 is directly applied to the surface of the running base paper 2. Next, 2 which is on the downstream side of the curtain coater 3
The coating color 7 is applied by the curtain coater 3 to the upper and lower two guide rolls 12 and 13 disposed on the floor portion and the first floor portion below the floor portion, and the uncoated surface of the coated paper 2a in an undried state. After changing the paper path downward from the second floor portion to the first floor portion by guiding the respective sides, the paper path is further changed in the horizontal direction, and then guided to the dryer 9 to perform the drying process. The later coated paper 2b is guided to a winding machine 10 disposed adjacent to the rewinding machine 1 on the first floor portion by guide rolls 15,1.
There is one that is wound after being hung on 6.

[0008]

However, in recent years, with the speeding up of the coating apparatus or the diversification of the coating colors 7, the drying machine 9 has been required to secure the drying time of the coating colors 7. However, in the case of the coated paper manufacturing equipment shown in FIG. 6, since the dryer 9 must be installed on the first floor, the dryer 9 is not sufficient in terms of space. The length cannot be increased, and there is a problem in that a sufficient length is required to directly increase the installation space. In the case of the coated paper manufacturing equipment shown in FIG. Since the coated surface of the coated paper 2a in the undried state is on the lower side, the coated surface is likely to be saturated, and therefore the drying of the coated surface is more likely to be incomplete, and Due to the contact with the guide rolls 15 and 16 arranged on the work surface, scratches occur on the coating surface. There is a problem that the rate of occurrence of defective portion is increased.

Accordingly, the present invention eliminates the need to install a dryer at a low position such as the first floor, and allows the installation position of the dryer to be set more freely. It is intended to provide.

[0010]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a coating film having a coating film flowing down from a coating head on a surface of a base paper which is wound around a coater roll and travels. As the coating color is applied directly to the downstream side of the curtain coater, the coated paper coated with the coating color is guided to the dryer while the paper path direction is in a non-contact direction to the upper side that is the coating surface side. An air floater for changing the air flow is provided, and the front surface of the air chamber connected to the air supply device is curved in a smooth convex shape along the paper path direction. In addition, a large number of airflow discharge holes are formed at required intervals in the paper path direction and the paper width direction.

On the downstream side of the curtain coater, the undried coated paper on which the coating color has been applied is guided to an air floater, where the air flow is distributed over the entire curved surface. Since air is ejected from the discharge holes, an air film is formed between the curved surface and the undried coated paper, and the coated surface of the coated paper is The paper path is guided along the curved surface without contacting the curved surface of the air floater, so that the paper path is directed toward the coating surface, that is, upward.

Further, among a number of air flow discharge holes provided on a curved surface on the front surface of the air chamber of the air floater, air flow discharge holes at both ends in the paper width direction are formed obliquely outward.
When air is blown outward in the paper width direction, a dynamic pressure is generated by the blown air, and an air film having a lower pressure than both edges in the width direction is formed at the center in the width direction of the undried coated paper. Can be caused, whereby the coated paper in which the coating color is not dried can be brought close to the curved surface of the air floater, and the coated paper can be guided stably.

[0013] Further, by adopting a structure in which warm air can be supplied to the air chamber of the air floater so that warm air is blown out from the airflow discharge hole of the curved surface, the coating color in the air floater is not dried. When guiding the coated paper in the state, the coating color can be dried at the same time, the drying efficiency can be increased, and the dryer can be reduced in size to reduce the size of the entire apparatus. Can be planned.

[0014]

Embodiments of the present invention will be described below with reference to the drawings.

FIGS. 1 and 2 (a) and (b) show an embodiment of a paper path direction changing apparatus for coated paper according to the present invention.
As shown in FIG. 1, as an example of a coated paper manufacturing facility using the paper path changing device, a winding machine 10, a rewinding machine 1, and a curtain coater 3 are sequentially and horizontally installed on the first floor portion. A dryer 9 is installed on the second floor above the winder 10, and an undried coating is applied between the curtain coater 3 and the dryer 9. An air floater 17 is provided for changing the paper path of the paper upward without contacting the coating surface side.

A guide roll 4 is provided below the coater roll 5 for guiding the base paper 2 to the curtain coater 3.
And a plurality of guide rolls 14 are provided between the guide roll 4 and the rewinding machine 1, and the base paper 2 unwound from the rewinding machine 1 is guided by the guide rolls 14, and then the guide rolls 4. To change the paper path upward, and then wrap the same surface on the coater roll 5 at the upper position, then reverse the direction of the rewinding machine 1 and slightly raise the base paper 2 toward the downstream side. In this state, it is guided to a coating head 6 to apply a coating color 7 in the form of a curtain film on the surface (upper surface).

Further, on the downstream side of the curtain coater, a guide roller 8 for guiding the coated paper 2a coated with the coating color 7 to the air floater 17, and an air floater 1
7 is provided with a guide roller 18 for guiding the coated paper 2a that has passed through the coating paper 2a to the second floor, so that the coating color 7 is in an undried state.
Is applied to the guide roller 8 so that the paper path runs horizontally or downstream with a slight downward gradient, and then the paper path is changed obliquely upward along the air floater 17. After that, the opposite side of the coated paper 2a is hung on the guide roller 18 to change the paper path in the horizontal direction, and then the coated paper 2a is guided to the dryer 9 installed on the second floor. It is.

The air floater 17 is shown in FIG.
(B) As shown in detail in an example, a curved surface 20 having a length slightly wider than the width of the coated paper 2a and having a smooth arcuate front surface so as to have a fan-shaped cross section.
Duct 2 for guiding pressurized air 21 from an air supply device (not shown) to the rear side of an air chamber 19 having
2 are connected, and slits 23 are provided in the front curved surface 20 as air flow discharge holes in multiple rows and multiple stages in parallel with the paper path direction, and the air 21 guided from the duct 22 into the air chamber 19 is provided. Each of the slits 23 can be ejected forward, and is installed so as to have an obliquely downward attitude on the downstream side of the paper path.

A guide roll 15 is disposed at the end (left end in the figure) of the second floor, which is downstream of the dryer 9, on the side of the winder 10, and the coated paper 2b having a dried coating surface is provided. Is guided by a guide roll 15 to change the paper path downward and guided to the winding machine 10, and the coated paper 2
b can be wound up.

On the surface of the base paper 2 unwound from the rewinding machine 1 and guided to the curtain coater 3, a coating color 7 in the form of a curtain film is directly applied continuously in the curtain coater 3. Thereafter, the coated paper 2a is caused to travel downstream while the coated coating color 7 is still in an undried state, and is guided below the air floater 17 along the paper path. At this time, the air floater 17 uses the curved surface 2
Since the air 21 is blown out from the slits 23 disposed on the entire surface of the coated paper 2, an air film is formed between the curved surface 20 and the coated paper 2 a where the coating color is not dried. With this air film, the coated surface of the coated paper 2a is bent toward the coated surface side along the curved surface 20 without the coated surface of the coated paper 2a coming into contact with the curved surface 20 of the air floater 17. As a result, even if the coating color 7 is in an undried state, it is possible to change the direction of the paper path to the coating surface side and to change the direction upward.

Thereafter, the coated paper 2a is guided by the guide roll 18 and guided to the dryer 9, and the dried coated paper 2b of the coating collar 7 is wound by the winder 10. become.

As described above, the coating color 7 is dried by the air floater 17 in a non-contact state.
The direction of the paper path a can be changed to the coating surface side, that is, upward.
The dryer 9 can be installed above, the dryer 9 can be installed on the second floor, and the rewinding machine 1 can be installed below the dryer 9, and the coated paper manufacturing can be performed. Since the equipment can be stacked and arranged in a two-story form, and furthermore, the dryer 9 can be arranged above the coated paper manufacturing equipment to increase the installation space. Even if it becomes necessary to lengthen the dryer 9 in accordance with the diversification of the working collars 7, it is possible to cope with this without increasing the flat space required for installing the entire apparatus.

When passing through the dryer 9, the coated paper 2 a after color application has the coated surface facing upward, so that the saturated state near the coated surface is suppressed, and drying by the dryer 9 is performed. It is possible to shorten the time, and even if an undried portion of the coating color 7 occurs, the drying of the undried portion after passing through the dryer 9 can be promoted. In addition, it is possible to suppress a possibility that a defect occurs on the coated surface.

Next, FIG. 3 shows another embodiment of the air floater in the paper path direction changing device of the present invention. The air floater has the same structure as that shown in FIGS. In the floater 17, the air chamber 19
Of the many slits 23 formed in the curved surface 20 of
The slits 23 in a plurality of rows (three rows in the figure) at both ends in the longitudinal direction are formed at obliquely outward angles.

According to the present embodiment, the air 21 is sprayed outward from the slits 23 at both ends in the longitudinal direction of the air floater 17 onto the surface of the wet coated paper 2a. The air flow of the air 21 generates a dynamic pressure, and the air film formed at the center in the width direction of the coated paper 2a is smaller than the air film formed at both ends in the width direction. The pressure becomes low, which causes the coated paper 2a
Since the central part of the air floater 17 is attracted to the vicinity of the curved surface 20 of the air floater 17, the coated paper 2a is brought close to the curved surface 20 of the air floater 17,
We can guide you stably.

The present invention is not limited to the above-described embodiment. For example, hot air can be used instead of the air 21 supplied to the air floater 17. In this way, warm air can be blown out from the slits 23 of the front curved surface 20, and when the coated paper 2 a is guided by the air floater 17, the drying action of the coated paper 2 a after color application is performed. The drying efficiency of the coated paper 2a can be enhanced in combination with the drying in the dryer 9, and the capacity of the dryer 9 can be reduced to reduce the drying efficiency. It is also possible to reduce the size. In addition, the size and number of the slits 23 can be changed if the air chamber 19 of the air floater 17 can blow out the air 21 from the many slits 23 formed in the curved surface 20 on the front surface substantially uniformly. The air flow discharge holes provided on the curved surface 20 of the air floater 17 include:
Although a large number of slits 23 extending in the paper path direction are shown, when guiding the coated paper 2a after color application, a required air film is formed between the coated paper 2a and the curved surface 20. If it can be formed, as shown in FIG. 4, the shape and arrangement position of the airflow discharge holes are freely determined, such as arranging a large number of round holes 24 at required intervals in the paper path direction and the base paper width direction. It goes without saying that various changes may be made without departing from the spirit of the present invention.

[0027]

As described above, according to the apparatus for changing the paper path direction of coated paper according to the present invention, the coating paper flowing down from the coating head onto the surface of the base paper which is wound around the coater roll and travels. In the downstream position of the curtain coater where the color is applied directly as a curtain film, the paper path direction is contacted without contact while the coated paper coated with the coating color is guided to the dryer. And an air floater for changing the air floater to the upper side.The front surface of the air chamber connected to the air supply device is curved into a smooth convex shape along the paper path direction. Since a large number of airflow discharge holes are formed in the curved surface at required intervals in the paper path direction and the paper width direction, the paper path of the coated paper coated with the coating color by the curtain coater is used. Do not touch the coated surface It can be changed to the coating surface side and turned upward, whereby the dryer can be arranged at a position above the curtain coater, and the degree of freedom of the installation space of the dryer can be increased. Even if it is necessary to lengthen the dryer due to the speeding up of the processing equipment and the diversification of coating colors, it is possible to prevent the plane space required for installation of the entire apparatus from becoming large, Since the air floater is in non-contact with the coated surface of the coated paper after the color coating, there is no danger of generating a defect on the coated surface. Out of a number of airflow discharge holes provided on the curved surface, the airflow discharge holes at both ends in the paper width direction are formed obliquely outward, and air is blown outward in the paper width direction. By The blown air generates a dynamic pressure, so that a low-pressure air film can be generated at the center in the width direction of the undried coated paper from both ends in the width direction, whereby the coating color is undried. The coated paper in the state can be guided stably in a state of being close to the curved surface of the air floater, and furthermore, it is possible to supply warm air to the air chamber of the air floater so that the air can be supplied from the airflow discharge hole of the curved surface. By adopting a configuration in which hot air is blown out, the coating color can be dried at the same time when the coating color is guided in the undried state in the air floater, and the drying efficiency is improved. In addition, the present invention has an excellent effect that the dryer can be reduced in size, and the size of the entire apparatus can be reduced.

[Brief description of the drawings]

FIG. 1 is a schematic side view showing an example of a coated paper manufacturing facility using the coated paper path changing apparatus of the present invention.

FIG. 2 shows details of an air floater in the paper path direction changing device of FIG. 1, (a) is a cut side view,
(B) is a developed view as viewed from the AA direction of (A).

FIG. 3 is a cross-sectional view of a curved surface showing another embodiment of the air floater in the paper path direction changing device of the present invention.

FIG. 4 is a view showing still another embodiment of the air floater in the paper path direction changing device of the present invention in correspondence with FIG.

FIG. 5 is a side view schematically showing an example of a conventional coated paper manufacturing facility.

FIG. 6 is a schematic side view showing another example of the conventional coated paper manufacturing equipment.

[Explanation of symbols]

 2 Base paper 2a, 2b Coated paper 3 Curtain coater 5 Coater roll 6 Coating head 7 Coating color 9 Dryer 17 Air floater 19 Air chamber 20 Curved surface 21 Air 23 Slit (air flow discharge hole) 24 Round hole (air flow discharge) Hole)

Claims (4)

[Claims] 1. A downstream side of a curtain coater in which a coating color flowing down from a coating head is directly applied as a curtain film on a surface of a base paper wound around a coater roll and running. While guiding the coated paper coated with the coating color to the dryer, a configuration is provided in which an air floater is installed for changing the paper path direction to the upper side which is the coating surface side in a non-contact manner. Characteristic device for changing the paper path direction of coated paper. 2. An air floater, wherein the front surface of an air chamber connected to an air supply device is curved in a smooth convex shape along a paper path direction, and an air flow discharge hole is formed on the curved surface in a paper path direction and a paper width. 2. The apparatus for changing the direction of paper path of coated paper according to claim 1, wherein a plurality of holes are formed at predetermined intervals in the direction. 3. Out of a number of air flow discharge holes provided on a curved surface of a front surface of an air chamber of an air floater, air flow discharge holes at both end portions in the paper width direction are formed obliquely outward and outward in the paper width direction. 3. The apparatus according to claim 2, wherein air is blown out of the apparatus. 4. The apparatus for changing the paper path direction of coated paper according to claim 2, wherein warm air can be supplied to an air chamber of the air floater so as to blow warm air from an air flow discharge hole of the curved surface. .