JPH11253861A - Coater - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the outflow of the carrier air intercepted by an air intercepting plate in the width direction of the paper and to prevent the deposition of the paper powder on the tip of the air intercepting plate. SOLUTION: A coating soln. 4 discharged from a liq. feed head 3 in the form of a curtain on the downstream side of a coater roller 1 in its rotating direction is applied on the surface of a base paper 2 by this coater. An air intercepting plate 6 is obliquely arranged in the form of a scraper on the upstream side of the position where the coating soln. is applied on the base paper 2. The tip of the air suction nozzle 9 of an air suction header 8 set outside and behind the coater rollers 1 is positioned close to the air intercepting plate 6. The air carried by the traveling base paper 2 is intercepted by the plate 6, sucked and removed by the air suction nozzle at the same time.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coating apparatus for applying a coating liquid to base paper produced in a paper mill.

[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 is
In order to improve the properties of the paper surface, a coating liquid is applied to the paper surface to manufacture the paper, and there is a coating apparatus as the apparatus.

[0003] As one of the coating apparatuses, a so-called curtain coater is known in which a coating liquid is caused to flow down in a curtain shape and is applied to the surface of a base paper.
As shown in an example, a coating liquid 4 is caused to flow down from a liquid supply head 3 onto a surface of a base paper 2 wound around a coater roll 1 and traveling downstream from the coater roll 1 in a uniform thin film curtain shape. To apply by applying
At a position between the liquid supply head 3 and the base paper 2, a shutter pan 5 is movably arranged in the front-rear direction perpendicular to the flowing direction of the coating liquid 4, and supply and stop of the coating liquid 4 to the base paper 2 are performed. The ON operation of retracting the shutter pan 5 to retreat from the flow-down position of the coating liquid 4 and the OFF operation of moving the shutter pan 5 forward to block the flow-down position of the coating liquid 4 are performed. . That is, since the coating liquid 4 has a viscosity and fluidity suitable for coating processing, when the coating is stopped, the shutter pan 5 is at the OFF position located below the liquid supply head 3 and the coating liquid which is allowed to flow down. The working liquid 4 flows out from the end of the shutter pan 5 and is collected. When the coating is started, the shutter pan 5 is retracted in the horizontal direction and turned on.
It works.

On the other hand, in recent years, the operation of applying the coating liquid 4 to the surface of the base paper 2 by the coating apparatus has been accelerated.
When the base paper 2 is run at a high speed, air that is drawn (conveyed) by the running of the base paper 2 is sent to the coating position, thereby causing the curtain of the coating liquid 4 to be disturbed. As a result, there is a problem that the coating is adversely affected. Therefore, the air entrained by the base paper 2 is removed upstream of the coating position, and the liquid supply head 3 and the base paper 2 are removed.
As a means for preventing air from entering between them, there has been proposed a system in which the air blocking plate 6 is disposed in an inclined manner in a scraper shape such that the leading end is located upstream of the coating position and is in contact with the surface of the base paper 2. I have. Reference numeral 7 denotes a color pan for collecting the coating liquid 4 flowing down from the width end of the base paper 2 during coating.

[0005]

However, as described above, even if the air-blocking plate 6 is inclined on the surface of the base paper 2, the co-rotating air blocked by the air-blocking plate 6 flows out in the paper width direction. Therefore, there is a problem that a part of the air goes around the coating position and affects the curtain of the coating liquid 4. Further, since the leading end of the air blocking plate 6 is in contact with the surface of the base paper 2, there is a problem that the scraped paper powder accumulates at the leading end.

Accordingly, the present invention is to prevent the air blocked by the air blocking plate from flowing out in the paper width direction and to prevent paper dust from accumulating on the leading end of the air blocking plate. .

[0007]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a coating liquid which flows down in a curtain form from an upper liquid supply head onto the surface of a base paper traveling downstream through a coater roll. In a coating apparatus that is to apply and apply, an air blocking plate is disposed on the upstream side of the coating position of the coating liquid on the base paper so that the tip is located at the coating position, In addition, an air suction header is provided upstream of the air blocking plate, and the tip of the air suction nozzle of the air suction header is located close to the rear end of the air blocking plate.

[0008] The air entrained by the travel of the base paper is shut off by the air shut-off plate and further suction-removed by the air suction nozzle, thereby preventing the air from flowing out in the paper width direction.
At this time, the paper dust scraped off at the tip of the air blocking plate is also sucked simultaneously by the air suction nozzle, so that the paper dust does not accumulate at the tip of the air blocking plate.

An air blocking plate is connected to a front end of a holding member arranged to extend upstream above the air suction nozzle, and a rear end of the holding member is connected to a hinge. A spring member is provided between the lever provided on the
With the configuration in which the contact pressure of the tip end of the air blocking plate with respect to the base paper can be adjusted, the air blocking plate can be tilted up and down around the hinge via the holding member, and the contact pressure against the base paper by the action of the spring member. Is constant, so that even if the base paper fluctuates up and down, the air blocking plate can maintain the contact with the base paper, and further, the lower surface of the front end of the holding member and the upper surface of the tip of the air suction nozzle can be maintained. With the structure in which the closing member is interposed between the holding member and the air suction nozzle, the intrusion of air from the gap between the holding member and the air suction nozzle is prevented, so that the suction capability of the air suction nozzle is ensured. Further, the closing member is an elastic plate, one end of the elastic plate is attached to the lower surface of the front end of the holding member or the upper surface of the tip of the air suction nozzle, and the other end is the upper surface of the tip of the air suction nozzle. or By that so as to press the front end lower surface of the holding member configuration, the holding member is tilted displaced because its displacement is absorbed by the elastic plate,
The function as the closing member is always ensured.

On the other hand, instead of holding the air blocking plate on the holding member, the rear end of the air blocking plate is connected to the tip of the air suction nozzle, so that the air blocking plate is connected to the air suction nozzle. And the air blocking plate and the air suction nozzle are integrally and continuously arranged, so that the suction force of the air suction nozzle can be effectively applied, and furthermore, the rear end of the air blocking plate A hinge is interposed at the connection between the head and the tip of the air suction nozzle, and the air blocking plate itself can follow the vertical fluctuation of the base paper by making the air blocking plate freely tiltable in the vertical direction. It can be displaced.

[0011]

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

FIG. 1 shows an embodiment of the present invention. As shown in FIG. 3, an upper surface of a base paper 2 wound around a coater roll 1 and run downstream is supplied with an upper liquid supply. The coating liquid 4 flowing down in a curtain form from the head 3 is applied and coated, and the liquid supply head 3 and the base paper 2 are coated.
The supply of the coating liquid 4 to the base paper 2 is performed in a coating apparatus in which the supply and the stop of the coating liquid 4 to the base paper 2 are performed by moving the shutter pan 5 forward and backward. The air-blocking plate 6 is inclined and disposed in the form of a scraper so that the tip is located close to the upstream side of the position, and an air suction header is provided on the outer rear portion of the coater roll 1 at the upstream position of the air-blocking plate 6. 8, the tip of an air suction nozzle 9 connected to the air suction header 8 and disposed so as to correspond to the paper width direction is positioned close to the air blocking plate 6.

The holding member 10 of the air blocking plate 6 is
An air blocking plate 6 is connected to the front end of the air suction nozzle 9 so as to extend rearward on the upstream side in the running direction of the base paper, and the rear end of the holding member 10 is moved in the paper width direction. The air blocking plate 6 is connected to a horizontally arranged hinge 11 so that the air blocking plate 6 can be tilted up and down about the hinge 11 via the holding member 10. And a spring member 13 is interposed between the lever 12 and the fixed side to adjust the contact pressure of the tip end of the air blocking plate 6 with the base paper 2. Further, in order to close the gap between the holding member 10 and the air suction nozzle 9, the holding member 10
Closing member 1 made of an elastic plate such as a leaf spring on the lower surface of the front end portion of
One end of the air suction nozzle 9 is fixed to one end of the air suction nozzle 9 and the other end of the closing member 14 is elastically pressed against the upper surface of the tip end of the air suction nozzle 9.

When a coating liquid 4 flowing down in a curtain form from the liquid supply head 3 is applied to the surface of the base paper 2 to perform coating, the air on the upstream side is entrained by the running of the base paper 2 and is caused to rotate. However, it is blocked by the air blocking plate 6 disposed on the upstream side of the coating position, which is the coating point of the coating liquid 4 on the base paper 2, and is prevented from entering the coating position. . In the present invention, since the air suction nozzle 9 of the air suction header 8 is arranged close to the air blocking plate 6,
It is carried to the air blocking plate 6 and the air blocking plate 6
The air blocked by the above can be suctioned and removed by the air suction nozzle 9, thereby preventing the air from flowing out in the paper width direction. Therefore, the curtain of the coating liquid 4 is not disturbed by air, and stable coating can be performed. Further, in the above case, the paper dust scraped off at the tip of the air blocking plate 6 can also be sucked and removed by the air suction nozzle 9 at the same time, thereby preventing the paper dust from accumulating on the tip of the air blocking plate 6. be able to.

The air blocking plate 6 can be vertically tilted about a hinge 11 via a holding member 10 and is pressed by a lever 12 protruding from the hinge 11 so as to be pressed. The contact pressure of the leading end of the air blocking plate 6 with the base paper 2 is adjusted by the action of the base paper 2 so that the state of contact with the base paper 2 is maintained even when the running base paper 2 fluctuates in the vertical direction. Can be.
The lower surface of the front end of the holding member 10 and the air suction nozzle 9
Is closed by the closing member 14, so that air does not intrude from the gap between the holding member 10 and the air suction nozzle 9, and the suction capability of the air suction nozzle 9 is ensured. Things. Furthermore,
The closing member 14 is made of an elastic plate such as a leaf spring, and one end is attached to the holding member 10 side and the other end is arranged so as to be pressed against the air suction nozzle 9 side. Is tilted up and down, the air suction nozzle 9 absorbs the displacement by its own elasticity.
Since it is possible to maintain the pressure contact state with the air blocking plate 6, it is possible to reliably prevent extra air from entering the air blocking plate 6.

Next, FIG. 2 shows another embodiment of the present invention, in which the start and stop of coating are started by horizontally moving the liquid supply head 3 in the front-back direction which is the running direction of the base paper 2. An example of application to a coating apparatus that is performed will be described. In other words, the air blocking plate 6 is disposed in the form of a scraper in an inclined manner in the same manner as shown in FIG. 1 on the upstream side of the coating position which is the coating point of the coating liquid 4 on the base paper 2. A shutter pan 15 having a flow guide plate 17 whose lower end is smoothly curved forward is attached to a tip end of the shutter pan 15 so as to overlap above the air blocking plate 6.
The coating liquid 4 is moved along the flow guide plate 17 by moving the liquid supply head 3 from the rear to the front of the flow guide plate 17 so that the lower end of the base 7 is in contact with the surface of the base paper 2 and then applied to the base paper 2. In the coating apparatus, the air suction header 8 is installed on the outer rear portion of the coater roll 1 on the upstream side of the air blocking plate 6, and the air suction nozzle 9 of the air suction header 8 is moved to the front end. Are positioned so as to be close to the air blocking plate 6, and the rear end of the air blocking plate 6 is connected to the upper edge of the tip of the air suction nozzle 9 by a hinge 18 so as to be rotatable in the vertical direction. 19 is shutter pan 1
5 shows a support shaft for flipping up 5.

As shown in FIG. 2, since the air shut-off plate 6 and the air suction nozzle 9 are integrally connected, the suction force of the air suction nozzle 9 can be effectively applied with a simple structure. In addition, the air blocking plate 6 itself can follow up and down fluctuations of the base paper 2 by tilting up and down around the hinge 18 as a fulcrum.

In the embodiment shown in FIG. 2,
The case where the air shut-off plate 6 and the air suction nozzle 9 are connected by the hinge 18 is shown, but it is sufficient that the air cut-off plate 6 is connected without the hinge 18, and the shutter pans are of two types indicated by 5 and 15. However, the shutter member can be applied to any type of coating device without being limited to the type of the shutter pan shown and described, and the closing member 1 shown in FIG.
Of course, the mounting of 4 may be upside down and various changes may be made without departing from the spirit of the present invention.

[0019]

As described above, according to the present invention, the following excellent effects are exhibited. (1) In a coating apparatus, the coating paper is applied by applying a coating liquid that has flowed in a curtain form from an upper liquid supply head onto a surface of the base paper traveling downstream through a coater roll. On the upstream side of the coating position of the coating liquid, an air blocking plate is arranged so that the tip is located at the coating position, and an air suction header is installed upstream of the air blocking plate,
Since the tip of the air suction nozzle of the air suction header is located close to the rear end of the air shut-off plate, the air transported to the vicinity of the coating position by traveling of the base paper is sent to the air shut-off plate. And can be removed by suction at the air suction nozzle.
By preventing the air from flowing out in the paper width direction, the coating operation can be performed stably without disturbing the curtain of the coating liquid due to the influence of the air.
Paper dust scraped off at the tip of the air blocking plate can also be sucked by the air suction nozzle at the same time, and it is possible to prevent paper dust from accumulating on the tip of the air blocking plate. (2) An air blocking plate is connected to a front end of a holding member arranged to extend upstream above the air suction nozzle, and a rear end of the holding member is connected to a hinge and provided on the hinge. A spring member is provided between the lever and the fixed side to adjust the contact pressure of the tip end of the air blocking plate against the base paper. Can be kept constant. (3) By adopting a configuration in which a closing member is interposed between the lower surface of the front end portion of the holding member and the upper surface of the tip portion of the air suction nozzle, air can enter through a gap between the holding member and the air suction nozzle. Can be prevented, and suction can be reliably performed without causing a loss in the suction capacity of the air suction nozzle. (4) The closing member is an elastic plate, one end of the elastic plate is attached to the lower surface of the front end of the holding member or the upper surface of the tip of the air suction nozzle, and the other end is the upper surface of the tip of the air suction nozzle or the front end of the holding member. By adopting a configuration in which the lower surface is brought into pressure contact, the displacement of the holding member can be absorbed by the elastic plate,
A constant closing function can be ensured. (5) Instead of holding the air blocking plate on the holding member,
Since the rear end of the air blocking plate is connected to the front end of the air suction nozzle, the air blocking plate and the air suction nozzle can be integrally connected to each other. Can effectively work the suction force. (6) The rear end of the air blocking plate is hingedly connected to the tip of the air suction nozzle, and the air blocking plate is configured to be tiltable in the vertical direction. The blocking plate itself can be displaced to follow, and the contact property with the base paper can be easily maintained.

[Brief description of the drawings]

FIG. 1 is a schematic view showing one embodiment of a coating apparatus of the present invention.

FIG. 2 is a schematic diagram showing another embodiment of the present invention.

FIG. 3 is a schematic view showing an example of a coating apparatus.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 coater roll 2 base paper 3 liquid supply head 4 coating liquid 6 air blocking plate 8 air suction header 9 air suction nozzle 10 holding member 11 hinge 12 lever 13 spring member 14 closing member 18 hinge

Claims (6)

[Claims] 1. A coating apparatus for coating and coating a surface of a base paper traveling downstream through a coater roll with a coating liquid that has flowed down from an upper liquid supply head in a curtain shape. On the upstream side of the coating position of the coating liquid on the base paper, an air blocking plate is arranged so that the tip is located at the coating position, and an air suction header is installed upstream of the air blocking plate. A coating device having a configuration in which a tip of an air suction nozzle of the air suction header is located close to a rear end of the air blocking plate. 2. An air blocking plate is connected to a front end of a holding member arranged to extend upstream above the air suction nozzle, and a rear end of the holding member is connected to a hinge. A spring member is provided between the lever provided on the
2. The coating apparatus according to claim 1, wherein the contact pressure of the tip end of the air blocking plate with the base paper is adjustable. 3. The coating apparatus according to claim 2, wherein a closing member is interposed between a front end of the holding member and a front end of the air suction nozzle. 4. The closing member is an elastic plate, one end of which is attached to the lower surface of the front end of the holding member or the upper surface of the tip of the air suction nozzle, and the other end is the upper surface of the tip of the air suction nozzle or the upper surface of the holding member. 4. The coating device according to claim 3, wherein the coating device is pressed against the lower surface of the front end portion. 5. The coating apparatus according to claim 1, wherein a rear end of the air blocking plate is connected to a front end of the air suction nozzle. 6. The coating apparatus according to claim 5, wherein a rear end portion of the air blocking plate is hingedly connected to a front end portion of the air suction nozzle so that the air blocking plate can be tilted up and down.