WO2011024637A1

WO2011024637A1 - Curtain coating apparatus and curtain coating method

Info

Publication number: WO2011024637A1
Application number: PCT/JP2010/063495
Authority: WO
Inventors: 森田　博文; 明男平野; 弘幸河野; 敏弘片野
Original assignee: ボイスパテントゲーエムベーハー
Priority date: 2009-08-31
Filing date: 2010-08-09
Publication date: 2011-03-03
Also published as: JP2011050817A; EP2474369A1; CN102574147A; CN102574147B; EP2474369B1; EP2474369A4

Abstract

Provided are a curtain coating apparatus and a curtain coating method for supplying a curtain film of paint on a surface of a delivered web so as to coat paint on the surface of the web, said apparatus and method enabling reduction of the energy consumed for the coating operation, a marked decrease in the apparatus investment, and improvement in the coating quality. The curtain-coating apparatus applies the paint on the surface of the web by treating the paint with a vacuum defoaming device, supplying the treated paint to a curtain head in order to form a curtain film of the paint by the curtain head, and applying the curtain film onto a surface of the delivered web, wherein the curtain-coating apparatus is characterized in that a heating device is installed in a pipeline for feeding the paint from the vacuum defoaming device to the curtain head for heating the paint flowing through the pipeline to a temperature approximate to the temperature of the curtain head. The curtain-coating method applies the paint on the surface of the web by treating the paint with a vacuum defoaming device, supplying the treated paint to a curtain head in order to form a curtain film of the paint by the curtain head, and applying the curtain film onto a surface of the delivered web, wherein the curtain-coating method is characterized in that the paint supplied from the vacuum defoaming device to the curtain head is heated to a temperature approximate to the temperature of the curtain head.

Description

Curtain coating apparatus and curtain coating method

The present invention relates to a curtain coating apparatus and a curtain coating method for supplying a paint curtain film to the surface of a web to be conveyed and applying the paint to the surface of the web.

For example, as one of the apparatuses for producing a thermal paper by applying a thermal paint to the surface of a web (base material) such as a coated base paper, it is conveyed from a curtain head that is a chamber with a nozzle for forming a curtain film of the paint. There is provided a curtain coating apparatus configured to apply a paint to the surface of the web by supplying a curtain film of the paint to the surface of the web (see, for example, Patent Document 1).

FIG. 5 shows an example of a conventional curtain coating apparatus. The curtain coating apparatus A has a supply tank Ts for storing the paint C supplied through the pipe h, and the supply tank Ts The stored paint C is supplied to the vacuum type defoaming device Da via the pipe a provided with the pump P1, and the paint C subjected to the defoaming process in the vacuum type defoaming device is supplied to the pump P2. It is supplied to the curtain head H via the interposed piping b.

The curtain head H is arranged above the web W to be transported, and includes a head portion Hh and a nozzle portion Hn, as shown in FIG. 6, and the head portion Hh has a paint supply path Hp along the longitudinal direction. The nozzle portion Hn is formed with a slot Hs communicating with the paint supply path Hp and opened downward along the longitudinal direction.

The paint C supplied to the paint supply path Hp of the curtain head H forms a curtain curtain V developed in the width direction of the web W by passing through the slot Hs, and is conveyed as shown by an arrow F. By supplying the curtain film V of the paint C from the curtain head H to the surface of W, the paint C is continuously applied to the surface of the web W.

FIG. 7 shows a curtain head of another form, and this curtain head H ′ includes a head portion Hh ′ and a nozzle portion Hn ′, and a paint supply path along the longitudinal direction of the head portion Hh ′. Hp ′ is extended, and a slot Hs ′ communicating with the paint supply path Hp ′ and opened upward is formed in the nozzle portion Hn ′ along the longitudinal direction.

The paint C supplied to the paint supply path Hp ′ of the curtain head H ′ passes through the slot Hs ′ and then flows down the guide surface Hg ′, thereby forming a curtain curtain V developed in the width direction of the web W. Then, the curtain film V of the paint C is supplied from the curtain head H ′ to the surface of the web W conveyed as indicated by the arrow F, whereby the paint C is continuously applied to the surface of the web W.

In the following, the curtain coating apparatus using the curtain head H shown in FIG. 6 will be described. Needless to say, the same applies to the curtain coating apparatus using the curtain head H ′ shown in FIG. .

As shown in FIG. 5, together with the curtain head H disposed above the web W, a return pan I is installed below the web W. The curtain head H and the return pan I are connected to the web W. It is accommodated in the inside of the heat insulation room R installed along the conveyance line.

An air duct Ad is installed in the upper part of the heat insulation room R constructed from a heat insulating material. The cool air from the air conditioner (air conditioner) Ac is sent to the air duct Ad by the blower fan Af, The curtain head H is cooled by the blown-out cool air (arrows w, w...).

On the other hand, during coating on the web W in the heat insulating room R, a part of the paint C which may flow out from the upper part of the curtain head H and is likely to contain bubbles is discharged to the return pan I as shown by an arrow v. The paint C collected in the return pan I is stored in the return tank Tr via the pipe d.

The paint C stored in the return tank Tr is supplied to a simple centrifugal defoaming device Db via a pipe e provided with a pump P3. After being defoamed in the centrifugal defoaming device Db, It is sent to the supply tank Ts through the pipe f, and the circulation of the supply tank Ts → vacuum deaerator Da → curtain head H → return pan I → return tank Tr → centrifugal deaerator Db → supply tank Ts repeat.

Here, in the above-described curtain coating apparatus A, the curtain head H accommodated in the heat insulation room R is cooled by an air conditioner (air conditioner) Ac. This is a coating quality as described in detail below. The purpose is to improve.

That is, in the curtain coating apparatus A as described above, since a heat source such as a dryer is used on the production line, the curtain head H is heated to about 30 ° C. to 40 ° C. when the heat insulation room R is not cooled. It will be warmed.

On the other hand, the temperature of the paint C supplied to the curtain head H is usually around 20 ° C., which is lower than the ambient temperature, through the vacuum defoaming device Da.

In the vacuum type defoaming apparatus Da, since the paint C is put into a very low pressure container of about 15 to 50 Torr, boiling occurs when the temperature is high, so it is necessary to cool the paint C to about 20 ° C. Therefore, the temperature of the paint C after defoaming is about 20 ° C. Incidentally, the temperature of the paint C after defoaming is lower than that before defoaming due to a cooling phenomenon caused by adiabatic expansion during defoaming.

For this reason, if the curtain head H is not cooled, the paint C of about 20 ° C. is supplied to the curtain head H of about 30 ° C. to 40 ° C., which is caused by the temperature difference from the paint C. Thus, there is a disadvantage that the curtain head H is thermally deformed.

In particular, the change in the width of the slot Hs in the nozzle portion Hn causes the flow rate of the paint C in the curtain curtain V to change over time, or to become uneven in the width direction of the web W. There is a possibility that the coating amount (the amount of the coating material C supplied to the surface of the web W) fluctuates, and this causes a significant decrease in coating quality.

Therefore, in the above-described conventional curtain coating apparatus A, the curtain head H is accommodated in the heat insulation room R and cooled by the air conditioner (air conditioner) Ac, so that the temperatures of the curtain head H and the paint C are equal. Thus, the curtain head H, in particular, the slot Hs in the nozzle portion Hn is prevented from being deformed in advance, and the deterioration of the coating quality is suppressed.

Japanese Patent Laid-Open No. 2001-18526

Incidentally, in the conventional curtain coating apparatus A that cools the curtain head H in order to prevent the deterioration of the coating quality as described above, there are some problems as described in detail below.

That is, in the conventional curtain coating apparatus A, the cool air is supplied to the inside of the heat insulation room R in order to cool the curtain head H accommodated in the heat insulation room R. There was a disadvantage that V was swung and this caused poor coating on the web W.

Further, since the curtain head H is cooled, water vapor in the surrounding air condenses to generate dew on the surface of the curtain head H, and this dew drops on the web W being coated, resulting in poor coating. In order to eliminate this inconvenience, it is essential to dehumidify the air in the heat insulation room R more than necessary.

Furthermore, in order to cool the curtain head H, the air supplied into the heat insulation room R is cooled, or the air in the heat insulation room R is dehumidified in order to prevent condensation on the curtain head H. In addition to the need for air conditioner Ac, blower fan Af, air duct Ad, and heat insulation room R as described above, various related facilities are also required, resulting in inconvenience that requires a large capital investment. Could not escape.

In view of the above situation, the present invention can achieve a reduction in energy consumption related to coating work and a significant reduction in equipment investment, and a curtain coating apparatus capable of achieving an improvement in coating quality, and The purpose is to provide a curtain coating method.

In order to achieve the above object, the curtain coating apparatus according to the invention of claim 1 supplies the paint applied to the vacuum defoaming apparatus to the curtain head, and the curtain film of the paint formed by the curtain head is conveyed. In the curtain coating apparatus for applying the paint to the web surface by supplying the paint to the surface of the web, the temperature of the paint flowing through the pipe is supplied to the pipe for supplying the paint from the vacuum deaerator to the curtain head. It is characterized in that a heating device for heating to a temperature approximate to that of the curtain head is provided.

The curtain coating apparatus according to the invention of claim 2 is the curtain coating apparatus according to the invention of claim 1, wherein the temperature of the paint heated by the heating device and supplied to the curtain head is changed to the temperature of the curtain head. On the other hand, it is characterized by being set within a temperature range of ± 5 ° C.

A curtain coating apparatus according to a third aspect of the present invention is the curtain coating apparatus according to the first aspect of the present invention, wherein a temperature sensor that detects the temperature of the curtain head and a temperature detected by the temperature sensor are supplied to the curtain head. And a control device for controlling the operation of the heating device so as to heat the temperature of the paint to be approximate to that of the curtain head.

According to a fourth aspect of the present invention, there is provided a curtain coating method in which a paint applied to a vacuum deaerator is supplied to a curtain head, and a curtain film of the paint formed by the curtain head is supplied to the surface of a web being conveyed. Thus, in the curtain coating method for applying paint to the surface of the web, the paint supplied to the curtain head from the vacuum defoaming device is heated to a temperature approximate to the curtain head by a heating device. It is said.

The curtain coating method according to the invention of claim 5 is the curtain coating method according to claim 4, wherein the temperature of the paint heated by the heating device and supplied to the curtain head is changed to the temperature of the curtain head. On the other hand, it is characterized by being set within a temperature range of ± 5 ° C.

The curtain coating method according to the invention of claim 6 is the curtain coating method according to the invention of claim 4, wherein the temperature of the paint supplied to the curtain head is approximated to the curtain head based on the temperature of the curtain head. It is characterized by controlling the operation of the heating device so as to obtain a temperature.

In the curtain coating apparatus according to the invention of claim 1, the temperature of the paint flowing through the pipe is approximated to that of the curtain head by a heating device provided in the pipe for supplying the paint from the vacuum deaerator to the curtain head. By heating to the temperature, the temperature difference between the curtain head and the paint can be suppressed without forcibly cooling the curtain head.
In this way, the temperature difference between the curtain head and the paint is suppressed, and the curtain film of the paint is not shaken by the air blow accompanying cooling, so that it is possible to achieve a significant improvement in coating quality. .
Furthermore, various facilities for cooling the curtain head are no longer necessary, and it is possible to reduce the capital investment associated with the installation of the cooling facility, and at the same time achieve a significant reduction in energy consumption associated with the coating work. It becomes possible.

In the curtain coating apparatus according to the invention of claim 2, the temperature of the paint heated by the heating device and supplied to the curtain head is set within a temperature range of ± 5 ° C. with respect to the temperature of the curtain head. As a result, the temperature difference between the curtain head and the paint can be kept small, the deformation of the curtain head due to the temperature difference can be prevented, and a significant improvement in coating quality can be achieved.

In the curtain coating apparatus according to the invention of claim 3, the operation of the heating device is controlled by the control device based on the temperature of the curtain head detected by the temperature sensor, and the temperature of the paint is added to a temperature approximate to that of the curtain head. By heating, the temperature difference between the curtain head and the paint can be kept as small as possible, thus preventing the curtain head from being deformed due to the temperature difference and achieving a significant improvement in coating quality. It becomes possible to do.

In the curtain coating method according to the invention of claim 4, the temperature of the paint flowing through the pipe is approximated to that of the curtain head by a heating device provided in the pipe for supplying the paint to the curtain head from the vacuum deaerator. By heating to the temperature, the temperature difference between the curtain head and the paint can be suppressed as much as possible without forcibly cooling the curtain head.
In this way, the temperature difference between the curtain head and the paint is suppressed, and the curtain film of the paint is not shaken by the air blown by cooling, so that it is possible to achieve a significant improvement in coating quality. Become.
Furthermore, various facilities for cooling the curtain head are not necessary, and it is possible to reduce the capital investment accompanying the installation of the cooling facility, and also achieve a significant reduction in energy consumption accompanying the coating work. Is possible.

In the curtain coating method according to the invention of claim 5, the temperature of the paint heated by the heating device and supplied to the curtain head is set within a temperature range of ± 5 ° C. with respect to the temperature of the curtain head. As a result, the temperature difference between the curtain head and the paint can be kept small, the deformation of the curtain head due to the temperature difference can be prevented, and a significant improvement in coating quality can be achieved.

In the curtain coating method according to the invention of claim 6, the operation of the heating device is controlled based on the temperature of the curtain head so that the temperature of the paint supplied to the curtain head becomes a temperature approximate to the curtain head. Therefore, the temperature difference between the curtain head and the paint can be suppressed as small as possible, so that the curtain head can be prevented from being deformed due to the temperature difference, and the coating quality can be greatly improved. Is possible.

BRIEF DESCRIPTION OF THE DRAWINGS The conceptual whole figure which shows the 1st Example of the curtain coating apparatus which concerns on this invention. The conceptual whole figure which shows the 2nd Example of the curtain coating apparatus which concerns on this invention. The conceptual whole figure which shows the 3rd Example of the curtain coating apparatus which concerns on this invention. The conceptual whole figure which shows the 4th Example of the curtain coating apparatus which concerns on this invention. The conceptual whole figure which shows the conventional curtain coating apparatus. (a) is a conceptual front view showing a curtain head, (b) is a cross-sectional view taken along line bb in (a) showing a cross section of the curtain head. Sectional drawing which shows the curtain head of another form.

Hereinafter, a curtain coating apparatus and a curtain coating method according to the present invention will be described in detail with reference to the drawings showing examples.

FIG. 1 shows a first embodiment of a curtain coating apparatus according to the present invention. The curtain coating apparatus 1 of this embodiment applies a heat-sensitive paint to the surface of a web (base material) such as a coated base paper. It is an apparatus that is used for the manufacture of heat-sensitive paper.

The curtain coating apparatus 1 has a supply tank 2 for storing the paint C supplied via the pipe 1a, and the paint C stored in the supply tank 2 passes through the pipe 1b provided with the pump P1. The paint C supplied to the vacuum defoaming device 3 and subjected to the defoaming process in the vacuum defoaming device 3 passes through the pump P2 and the piping 1c in which the heating device 10 described later is interposed. Supplied to the curtain head 4.

The curtain head 4 is disposed above the web W to be transported, and includes a head portion and a nozzle portion (not shown). A paint supply path extends along the longitudinal direction of the head portion, and the nozzle The part is formed with a slot in the longitudinal direction so as to communicate with the paint supply path and is not different from the conventional curtain head H shown in FIG.

The paint C supplied to the curtain head 4 forms a curtain curtain V developed in the width direction of the web W, and is conveyed, like the paint C supplied to the conventional curtain head H shown in FIG. By supplying a curtain film V of paint from the curtain head 4 to the surface of the web W, the paint C is continuously applied to the surface of the web W.

As described above, the curtain head 4 is disposed above the web W, while the return pan 5 is installed below the web W. The curtain head 4 and the return pan 5 are arranged on the web W. It is accommodated in the room 6 installed along the transfer line.

The room 6 is installed to prevent the blowing of wind from the outside so that the curtain film V of the paint formed in the curtain head 4 does not sway. For example, an inexpensive material such as a vinyl sheet is used. Because of its simple structure, capital investment is extremely inexpensive.

During coating on the web W in the room 6, a part of the paint C that flows out from the upper part of the curtain head 4 and may contain bubbles is discharged to the return pan 5 as indicated by the arrow v, and the return The paint C collected in the pan 5 is stored in the return tank 7 through the pipe 1d.

The paint C stored in the return tank 7 is supplied to a simple centrifugal defoaming device 8 through a pipe 1e with a pump P3 interposed therein, and after being defoamed in the centrifugal defoaming device 8, It is sent to the supply tank 2 through the pipe 1 f, and the circulation of the supply tank 2 → the vacuum deaerator 3 → the curtain head 4 → the return pan 5 → the return tank 7 → the centrifugal deaerator 8 → the supply tank 2 is hereinafter performed. repeat.

Incidentally, in the curtain coating apparatus 1 described above, since a heat source such as a dryer is used on the production line, the curtain head 4 is heated to about 30 ° C. to 40 ° C.

On the other hand, the paint C supplied from the vacuum degassing device 3 to the curtain head 4 through the pipe 1c is heated to a temperature approximate to that of the curtain head 4 by the heating device 10 installed in the pipe 1c. .

That is, the heating device 10 heats the temperature of the paint C flowing through the pipe 1c to a temperature approximate to that of the curtain head 4, and specifically surrounds the pipe 1c with a jacket, By supplying a heat medium such as warm air or warm water into the jacket, the paint C is heated to an appropriate temperature.

The heating device 10 is configured to supply the heat medium around the spirally formed pipe 1c in order to increase the heat transfer area between the pipe 1c and the heat medium (warm air, hot water). It is also effective to do.

Further, as the specific configuration of the heating device 10, various configurations such as providing an electric heater or a lamp heater around the pipe 1c can be adopted in addition to using the warm air or hot water as described above. Of course.

According to the curtain coating apparatus 1 and the curtain coating method of the embodiment as described above, the temperature difference between the paint C and the curtain head 4 is suppressed by heating the paint C supplied to the curtain head 4. Thus, the thermal deformation of the curtain head 4 due to the temperature difference is prevented in advance, and the variation in the coating amount with respect to the web W can be suppressed, whereby the coating quality can be improved.

In addition, according to the configuration of the embodiment as described above, the coating C is heated to suppress the temperature difference from the curtain head 4, in other words, the conventional configuration of cooling the curtain head (see FIG. 5) is adopted. Therefore, since the temperature difference between the curtain head 4 and the paint C is suppressed, there is no problem that the curtain film V of the paint C is inadvertently shaken by the air blown by the cooling, and the coating quality is improved. Significant improvements can be achieved.

Further, in the configuration of the above-described embodiment, the curtain head 4 is not cooled. Therefore, as in the conventional curtain coating apparatus that cools the curtain head (see FIG. 5), Condensation that occurs on the surface of the curtain head due to condensation does not cause inconveniences such as a coating failure caused by dropping onto the web W being coated.

Moreover, in the structure of an Example, since the curtain head 4 is not cooled, it is not necessary to perform the dehumidification for preventing the condensation of a curtain head, and also the various facilities for cooling a curtain head become unnecessary. In addition, the heating device 10 of the present embodiment is compact and requires less heat than the conventional cooling device using cold air (see FIG. 5). It is possible to reduce the investment and achieve a significant reduction in energy consumption accompanying the coating work.

Furthermore, in the above-described embodiment, the paint C is heated to suppress the temperature difference from the curtain head 4, in other words, the paint curtain C is cooled because the conventional curtain coating apparatus cools the curtain head. In contrast to the temperature of about 20 ° C., in this example, the viscosity of the coating C is lower than that of the conventional structure and the fluidity is good because the coating C is heated to about 35 ° C. Since it becomes a thing and grows smoothly, there exists an effect which coat quality improves significantly.

By the way, when the paint C is heated by the heating device 10, the actual temperature of the curtain head 4 to which the paint C is supplied is grasped by prior observation, and the temperature approximated to this actual temperature as much as possible. Desirably, it is extremely effective to heat the coating material C so as to be within a temperature range of ± 5 ° C. with respect to the temperature of the curtain head 4.

As described above, the temperature of the paint C heated by the heating device 10 and supplied to the curtain head 4 is set within a temperature range of ± 5 ° C. with respect to the temperature of the curtain head 4. And the temperature difference between the paint C and the paint C can be kept small, the deformation of the curtain head 4 due to the temperature difference can be prevented, and a significant improvement in coating quality can be achieved.

Furthermore, as the temperature of the paint C supplied to the curtain head 4, when the temperature of the paint C is significantly higher than that of the curtain head 4, the dried and solidified paint C adheres to the nozzle portion and damages the curtain film V. Considering events such as the occurrence of streak defects on the coated surface, the temperature from about −5 ° C. to the temperature slightly lower than the curtain head 4 with respect to the curtain head 4, in other words, exceeding the curtain head 4 Ideally, it should be in the range up to no temperature.

FIG. 2 shows a second embodiment of the curtain coating apparatus according to the present invention. The curtain coating apparatus 1A of this embodiment is a paint C that has been subjected to defoaming treatment in a vacuum defoaming apparatus 3. Is supplied to the curtain head 4 through a pipe 1g provided with a pump P2, and the pipe 1g is formed in a spiral shape for the purpose of increasing the overall length.

Here, the interior of the factory building where the curtain coating apparatus 1A is installed has an atmospheric temperature of about 30 ° C. to 40 ° C. because a heat source such as a dryer is used as described above. The paint C supplied from the vacuum degassing device 3 to the curtain head 4 via the pipe 1g is heated by the atmospheric temperature in the factory building while circulating the pipe 1g formed in a spiral shape. It becomes.

That is, the pipe 1g formed in a spiral shape as described above constitutes a heating device that uses the ambient temperature in the factory building as a heat source, and the paint C passes through the pipe 1g so that the paint C is in the same factory building. It will be heated to a temperature approximating that of the curtain head 4 exposed to the indoor ambient temperature.

Since the configuration of the curtain coating apparatus 1A described above is basically the same as the curtain coating apparatus 1 of the first embodiment except for the pipe 1g formed in a spiral shape, the curtain coating apparatus 1 in FIG. Detailed description will be omitted by giving the same reference numerals as those in FIG. 1 to elements having the same functions.

According to the configuration of the second embodiment as described above, similar to the curtain coating apparatus and the curtain coating method in the first embodiment, the energy consumption related to the coating work is reduced, and the equipment investment is greatly increased. Reduction can be achieved and an improvement in coating quality can be achieved.

FIG. 3 shows a third embodiment of the curtain coating apparatus according to the present invention. The curtain coating apparatus 1B of this embodiment is a paint C which has been subjected to defoaming treatment in the vacuum defoaming apparatus 3. Is supplied to the storage tank 9 through the pipe 1h provided with the pump P2, and the paint C stored in the storage tank 9 is supplied to the curtain head 4 through the pipe 1i.

Here, the interior of the factory building where the curtain coating apparatus 1A is installed has an atmospheric temperature of about 30 ° C. to 40 ° C. because a heat source such as a dryer is used as described above. The coating material C supplied from the vacuum degassing device 3 to the storage tank 9 through the pipe 1h is heated by the atmospheric temperature in the factory building while staying in the storage tank 9 for a while. .

That is, as described above, the storage tank 9 installed for the purpose of storing the paint C from the vacuum defoaming device 3 constitutes a heating device that uses the ambient temperature in the factory building as a heat source. By staying in the storage tank 9, the paint C is heated to a temperature approximate to that of the curtain head 4 exposed to the ambient temperature in the same factory building, and supplied to the curtain head 4 through the pipe 1i. It becomes.

Since the configuration of the curtain coating apparatus 1B described above is basically the same as the curtain coating apparatus 1 of the first embodiment except for the storage tank 9 and the

pipes

1h and 1i, the curtain coating apparatus 1 in FIG. Detailed description will be omitted by giving the same reference numerals as those in FIG. 1 to elements having the same functions.

According to the configuration of the third embodiment as described above, as in the curtain coating apparatus and the curtain coating method in the first embodiment, the energy consumption related to the coating work is reduced and the capital investment is greatly increased. Reduction can be achieved and an improvement in coating quality can be achieved.

FIG. 4 shows a fourth embodiment of the curtain coating apparatus according to the present invention. The curtain coating apparatus 1 'of this embodiment includes a temperature sensor S for detecting the temperature of the curtain head 4', And a control device 100 ′ for controlling the operation of the heating device 10 ′ based on the temperature detected by the temperature sensor S.

The temperature sensor S is installed at an appropriate location where the substantial temperature of the curtain head 4 ′ can be measured, such as the head portion or nozzle portion of the curtain head 4 ′, and the detection signal from the temperature sensor S is It is input to the control device 100 '.

In the control device 100 ′, the temperature of the paint C supplied to the curtain head 4 ′ is heated to a temperature approximate to that of the curtain head 4 ′ based on the temperature of the curtain head 4 ′ detected by the temperature sensor S. For this purpose, the heating device 10 'is controlled in operation (feedback control).

Here, the heating device 10 ', like the heating device 10 shown in FIG. 1, surrounds the circumference of the pipe 1c' with a jacket, and supplies a heat medium such as hot air or hot water to the inside of the jacket. Thus, the paint C is heated to an appropriate temperature, and the amount of the heat medium supplied to the inside of the jacket and the temperature of the paint C are adjusted based on a command from the control device 100 '. C is heated to a temperature approximate to that of the curtain head 4 '.

The configuration of the curtain coating apparatus 1 ′ other than the sensor S and the control apparatus 100 ′ is basically the same as that of the curtain coating apparatus 1 shown in FIG. In FIG. 4, the same reference numerals as those in FIG. 1 are added to the components having the same functions as those of the curtain coating device 1 to give a detailed description of the curtain coating device 1 ′. Omitted.

According to the configuration of the embodiment as described above, as in the curtain coating apparatus and the curtain coating method of the embodiment shown in FIG. 1, the energy consumption related to the coating work is reduced, and the equipment investment is greatly reduced. In addition, it is possible to achieve an improvement in coating quality.

In addition, according to the configuration of the above-described embodiment, based on the temperature of the curtain head 4 ′ detected by the temperature sensor S, the operation of the heating device 10 ′ is controlled by the control device 100 ′ to control the temperature of the paint C. By heating to a temperature approximating that of the head 4 ', the temperature difference between the curtain head 4' and the paint C can be suppressed as small as possible, so that the deformation of the curtain head 4 'due to the temperature difference is prevented. It is prevented in advance and a significant improvement in coating quality can be achieved.

Incidentally, in the configuration of the above-described embodiment, even if the heating device 10 ′ is provided with an electric heater or a lamp heater around the pipe 1c ′, the electric heater or lamp heater is supplied based on a command from the control device 100 ′. Of course, the temperature of the paint C can be adjusted to a temperature approximate to that of the curtain head 4 'by adjusting the amount of power supplied.

The curtain coating apparatus 1 shown in FIG. 1, the curtain coating apparatus 1A shown in FIG. 2, the curtain coating apparatus 1B shown in FIG. 3, and the curtain coating apparatus 1 ′ shown in FIG. The curtain coating apparatus and the curtain coating method according to the present invention are used for manufacturing various papers such as art paper, coated paper, pressure-sensitive paper, and paperboard. However, it goes without saying that the technique can be applied effectively.

Further, the curtain coating device 1 shown in FIG. 1, the curtain coating device 1A shown in FIG. 2, the curtain coating device 1B shown in FIG. 3, and the curtain coating device 1 ′ shown in FIG. Is a device for applying a single layer of paint to the surface of the web W. The curtain coating apparatus and the curtain coating method according to the present invention are arranged such that the first paint curtain film and the second paint are applied to the surface of the web to be conveyed. Needless to say, this is a technique that can be effectively applied even when a two-layer paint curtain film comprising a curtain film is supplied and the first paint and the second paint are applied in two layers.

1, 1A, 1B, 1 '... curtain coating device,
1a, 1b, 1c, 1d, 1e, 1f, 1g, 1h, 1i,
1a ', 1b', 1c ', 1d', 1e ', 1f' ... piping,
2, 2 '... supply tank,
3, 3 '... vacuum deaerator,
4, 4 '... Curtain head,
5,5 '... Return bread,
6,6 '... room,
7,7 '... return tank,
8, 8 '... Centrifugal defoaming device,
9 ... Storage tank,
10 '... heating device,
100 '... control device,
C ... Paint,
V ... Curtain membrane,
W ... Web.

Claims

A curtain for applying a paint to the surface of the web by supplying the paint applied to the vacuum deaerator to the curtain head and supplying the curtain film of the paint formed by the curtain head to the surface of the web to be conveyed In coating equipment,
A pipe for supplying paint from the vacuum defoaming device to the curtain head is provided with a heating device for heating the temperature of the paint flowing through the pipe to a temperature approximate to the curtain head. Curtain coating equipment.
The curtain according to claim 1, wherein the temperature of the paint heated by the heating device and supplied to the curtain head is set within a temperature range of ± 5 ° C with respect to the temperature of the curtain head. Coating equipment.
A temperature sensor for detecting the temperature of the curtain head;
A controller for controlling the operation of the heating device so as to heat the temperature of the paint supplied to the curtain head to a temperature approximate to that of the curtain head based on the temperature detected by the temperature sensor;
The curtain coating apparatus according to claim 1, further comprising:
A curtain for applying a paint to the surface of the web by supplying the paint applied to the vacuum deaerator to the curtain head and supplying the curtain film of the paint formed by the curtain head to the surface of the web to be conveyed In the coating method,
A curtain coating method, wherein a paint supplied to the curtain head from the vacuum defoaming device is heated to a temperature approximate to the curtain head by a heating device.
The curtain according to claim 4, wherein the temperature of the paint heated by the heating device and supplied to the curtain head is set within a temperature range of ± 5 ° C with respect to the temperature of the curtain head. Coating method.
A curtain coating method characterized in that, based on the temperature of the curtain head, the operation of the heating device is controlled so that the temperature of the paint supplied to the curtain head becomes a temperature approximate to the curtain head.