JP6936135B2 - Coating equipment and coating method using it - Google Patents

Description

The present invention relates to a coating device.

Conventionally, when coating a web running on a backup roll from a die, a die is arranged below the backup roll, and the coating liquid is pumped to a liquid reservoir provided on the die to pump the coating liquid to the liquid reservoir. The coating liquid is applied to the lower surface of the web from the discharge port through the liquid passage from the part.

Japanese Patent No. 5593967

However, when the coating liquid is applied to the web from the die as described above, there is a problem that air is mixed in the coating liquid at the start of the coating and air bubbles are mixed in the coating portion formed on the web. rice field.

Therefore, in view of the above problems, it is an object of the present invention to provide a coating apparatus in which air bubbles are not mixed in the coating liquid when coating is started by a die, and a coating method using the coating apparatus.

The present invention has a backup roll in which the web travels forward on the lower peripheral surface in the front-rear direction, and a die arranged below the backup roll. The die has a triangular cross section at an upper portion due to an inclined surface. The first main body formed in the above, the second main body combined with the rear surface of the first main body, and the upper portion formed in a triangular cross section by an inclined surface, and the coating provided on the first main body or the second main body. A liquid reservoir of the work liquid, a liquid passage of the coating liquid between the first main body and the second main body from the liquid storage part, and a slit-shaped coating liquid at the upper end of the liquid passage. On the left and right sides of the discharge port, the shim sandwiched between the first main body and the second main body, the coating liquid supply port provided in the central portion in the left-right direction of the liquid reservoir portion, and the liquid reservoir portion. a pair of left and right discharge passages of the coating solution provided, and the pair of opening and closing valves respectively connected to the outlet of the pair of left and right discharge passages have a longitudinal sectional shape of the liquid reservoir is As it goes up, it tapers and connects to the liquid passage, and the pair of left and right discharge passages extend diagonally upward from the front of the liquid passage in the liquid reservoir, respectively, and the first main body or the upper part of the second main body. It is a coating device which is open to each of the inclined surfaces formed in.

Further, in the present invention, the coating device described in the above invention is used to open the pair of left and right on-off valves before starting coating on the web traveling on the backup roll, and the coating liquid is used. Is supplied from the supply port to the liquid reservoir of the die, the coating liquid is discharged from the liquid reservoir through the pair of left and right discharge passages, and the coating liquid is discharged from the respective discharge passages. This is a coating method in which each of the on-off valves is closed when there are no air bubbles in the water, and coating is started on the web after the pair of left and right on-off valves are closed.

Since the coating liquid containing air bubbles is discharged from the discharge port with the on-off valve open, the coating is started, so that air bubbles are not mixed in the coated portion formed on the web.

It is a partial vertical sectional view of the coating apparatus of one Embodiment of this invention. It is an enlarged vertical sectional view of the central part of a die. It is an enlarged vertical sectional view of one of the left and right side portions of a die. It is a front view of a coating device. It is an enlarged vertical sectional view of a coated part.

Hereinafter, the web W coating device 10 according to the embodiment of the present invention will be described with reference to FIGS. 1 to 4. The web W is long and is a film, a metal plate, a mesh-like metal, paper, or a cloth.

(1) Overall Configuration of Coating Device 10 The overall configuration of the coating apparatus 10 will be described with reference to FIGS. 1 to 5. The coating device 10 has a backup roll 12, a die 14, and a bending device 8.

As shown in FIG. 1, the backup roll 12 rotates counterclockwise around the center O of the horizontal rotation axis 13, and the web W advances in the front-rear direction on the lower peripheral surface thereof (from the left in FIG. 1). Drive to the right, that is, from upstream to downstream).

As shown in FIGS. 1 and 2, the die 14 is provided below the backup roll 12. As shown in FIGS. 1 and 2, the die 14 has a first main body 16, a second main body 18, a base 20, and a mounting space 44.

As shown in FIGS. 1 and 2, the base portion 20 is a rectangular parallelepiped extending in the left-right direction, and the first main body 16 is integrally erected from the front portion of the upper surface.

As shown in FIGS. 1 to 3, the first main body 16 is a rectangular parallelepiped extending in the left-right direction, and the first inclined surface 22 is formed from the upper end portion of the rear surface toward the upper end portion of the front surface, and the upper portion has a triangular cross section. .. The rear surface of the first main body 16 is a vertical surface, and as shown in FIG. 3, the liquid reservoir portion 24 is formed in the left-right direction. At the tip of the upper portion of the first main body 16, a first coating blade portion 36 extending in the left-right direction and having a rectangular parallelepiped upper surface is formed.

As shown in FIGS. 1 and 2, the second main body 18 is arranged behind the first main body 16, that is, above the base 20, is a rectangular parallelepiped extending in the left-right direction, and has vertical dimensions. It is formed smaller than the first main body 16. A second inclined surface 26 is formed from the upper end of the rear surface of the second main body 18 toward the upper end of the front surface. At the tip of the upper portion of the second main body 18, a second coating blade portion 38 extending in the left-right direction and having a rectangular parallelepiped upper surface is formed.

A mounting space 44 is formed between the second main body 18 and the base 20. The upper surface of the mounting space 44 is formed on the lower surface of the second main body 18, the lower portion is formed on the upper surface of the base portion 20, the rear surface is open, the front surface is formed on the rear surface of the first main body 16, and the left and right side portions are formed. It is an open space.

As shown in FIGS. 1 to 3, a plate-shaped shim 28 is sandwiched between the rear surface of the first main body 16 and the front surface of the second main body 18. As shown in FIG. 3, the shim 28 is composed of both left and right peripheral portions 30, 32 and a lower peripheral portion 34 of the liquid reservoir portion 24.

The first main body 16, the second main body 18, and the shim 28 are integrally fixed by fastening bolts (not shown). When fixed integrally, as shown in FIGS. 1 and 2, the first inclined surface 22 and the second inclined surface 26 are formed in a triangular shape. The upper surface of the first coating blade portion 36 and the upper surface of the second coating blade portion 38 are at the same height, and the lower peripheral surface of the backup roll 12 is located above the upper surface with a coating interval.

A liquid passage 40 is vertically formed between the first main body 16 and the second main body 18 above the liquid reservoir 24, and a slit-shaped discharge port 42 is formed at the upper end thereof. .. That is, the slit-shaped discharge port 42 is located between the upper end portion of the first coating blade portion 36 and the second coating blade portion 38. Both sides of the liquid passage 40 are blocked by the left and right peripheral portions 30 and 32 of the shim 28, and the lower portion is blocked by the lower peripheral portion 34.

As shown in FIGS. 2 and 3, a coating liquid supply port 46 penetrates through the center of the front surface of the liquid reservoir 24 provided in the first main body 16 in the left-right direction, and the supply port 46 is coated. A hose 48 connected from a pump (not shown) that supplies the working liquid is connected.

The bend device 8 is a substantially rectangular parallelepiped provided below the die 14, and a pair of left and right arm portions 52 are erected from both left and right side portions on the upper surface. On the other hand, a pair of left and right support shafts 54 and 54 project from both side surfaces of the first main body 16 and are rotatably supported by a pair of left and right arm portions 52. As a result, the die 14 is rotatably arranged above the bend body 50 of the bend device 8 and is fixed at a specific position.

A vertical movement portion 56 is provided inside the bend main body 50, and a cylindrical die pressing portion 58 is provided at the upper end portion of the vertical movement portion 56. The cotter included in the vertical movement portion 56 moves horizontally to move the die pressing portion 58 up and down.

(2) Positional Relationship of Each Device The positional relationship between the backup roll 12 and the die 14 will be described. As shown in FIGS. 1 and 2, when the perpendicular line S is lowered from the center O of the rotation shaft 13 of the backup roll 12, the perpendicular line S is the first coating blade portion 36 of the first main body 16 of the die 14. Pass the front. As a result, the upper surface of the first coating blade portion 36 becomes the position closest to the lower peripheral surface of the backup roll 12. As shown in FIG. 2, the coating liquid discharged from the discharge port 42 is applied to the surface of the web W by the backup roll 12 that rotates counterclockwise. Then, the distance between the first coating blade portion 36 and the web W traveling on the backup roll 12 is the coating gap.

Next, the positional relationship between the discharge port 42 and the die pressing portion 58 will be described. The die pressing portion 58 is arranged on the lower surface of the base 20 so that the perpendicular line S drawn from the center O of the rotation shaft 13 of the backup roll 12 passes through the center of the cylindrical die pressing portion 58.

(3) Air Discharge Structure Next, a structure for discharging air from the liquid reservoir 24 will be described with reference to FIGS. 3 and 4.

The vertical cross-sectional shape of the liquid reservoir 24 provided in the first main body 16 is tapered toward the upper side, and the liquid passage 40 extends upward from the narrowest position.

A pair of left and right discharge passages 60 penetrate between the left and right sides of the liquid reservoir 24 and the first inclined surface 22 of the first main body 16 from the front of the liquid reservoir 24. The discharge passage 60 is inclined upward from the upper end of the liquid reservoir 24 toward the first inclined surface 22, the inlet of the discharge passage 60 faces the liquid reservoir 24, and the discharge port is the first inclined surface. It faces 22.

The inlets of the on-off valve 62 are connected to the outlets of the pair of left and right discharge passages 60. A discharge hose 64 made of a transparent or translucent Teflon (registered trademark) tube is connected to the outlets of the pair of left and right on-off valves 62, respectively. The on-off valve 62 is opened and closed by a manual lever 68. The tip of each discharge hose 64 is provided in the coating liquid collection container 66.

(4) Operating State of Coating Device 10 Next, a case where the coating liquid is applied to the web W by the coating device 10 will be described with reference to FIGS. 1 to 4.

First, the operator manually opens the levers 68, 68 of the pair of left and right on-off valves 62, 62.

Second, the coating liquid is supplied from a pump (not shown) to the liquid reservoir 24 of the die 14 arranged below the backup roll 12 via the hose 48 and the supply port 46.

Third, as shown in FIG. 1, the backup roll 12 is rotated in the counterclockwise direction, and the web W on the lower peripheral surface is advanced in the front-rear direction (running from upstream to downstream).

Fourth, when the coating liquid is supplied from the supply port 46 at the center of the liquid reservoir 24 and becomes full, it flows from the discharge passages 60 on both the left and right sides to the discharge hose 64 through the open on-off valve 62. The coating liquid flowing through the discharge hose 64 is collected in the collection container 66. Further, the coating liquid supplied to the liquid reservoir 24 rises from the liquid passage 40 and is discharged from the discharge port 42. The discharged coating liquid is test-coated on the surface of the web W running on the lower peripheral surface of the backup roll 12.

Fifth, the operator observes the coating liquid flowing through the transparent or translucent discharge hose 64, opens the on-off valve 62 until air bubbles are not mixed, and collects the coating liquid in the collection container 66. .. This observation is performed with the left and right discharge hoses 64, and when only one of the air bubbles disappears, the on-off valve 62 of only one of them is closed by the lever 68, and the on-off valve 62 of the other is opened until the air bubbles disappear. Leave it to. In addition, the operator observes whether or not there are air bubbles in the coated portion of the web W that is being test coated.

Sixth, when there are no air bubbles in the coated part of the web W that is being tested and there are no air bubbles in the coating liquid flowing out from the pair of left and right discharge hoses 64, the pair of left and right on-off valves 62 and 62 are opened. Closed.

Seventh, the coating liquid that has run out of air supplied to the liquid reservoir 24 rises from the liquid passage 40 and is discharged from the discharge port 42. The discharged coating liquid is applied to the surface of the web W running on the lower peripheral surface of the backup roll 12 in earnest. The state at this time will be described in more detail.

First, the first inclined surface 22 and the second inclined surface 26 of the die 14 are formed in a triangular shape, and the upper end portions thereof are the first coating blade portion 36 and the second coating blade portion 38. Since the portions of the first coating blade portion 36 and the second coating blade portion 38 are as if the lips are protruding upward, the so-called lip type is obtained. Then, coating can be performed at the upper end of the lip mold. However, the problem here is that the lower peripheral surface of the backup roll 12 is an arc, and the upper surface of the first coating blade portion 36 and the upper surface of the second coating blade portion 38 have a planar shape, so that they have the same height. However, it is not possible to perform coating on the upper surface of the first coating blade portion 36 and the upper surface of the second coating blade portion 38 with the same coating pressure and coating thickness.

Therefore, in the present embodiment, the front portion of the upper surface of the first coating blade portion 36 located downstream of the second coating blade portion 38 is positioned directly below the center O of the rotating shaft 13. In this way, the distance between the front portion of the upper surface of the first coating blade portion 36 and the lower peripheral surface of the backup roll 12 is closest, and the coating pressure is applied most at this close position. Therefore, coating is performed at the position where the coating pressure is highest. That is, the distance between the front portion of the upper surface of the first coating blade portion 36 and the lower peripheral surface of the backup roll 12 becomes the coating interval, and the coating thickness is determined. In particular, since the upper surface of the first coating blade portion 36 and the upper surface of the second coating blade portion 38 are set to the same height, the web W can run smoothly as shown in FIG. Further, the distance between the rear portion of the upper surface of the second coating blade portion 38 and the lower peripheral surface of the backup roll 12 is A, the distance between the front portion of the upper surface of the second coating blade portion 38 and the lower peripheral surface is B, and the second. Assuming that the distance between the rear portion of the upper surface of the first coating blade portion 36 and the lower peripheral surface is C, and the distance between the front portion and the lower peripheral surface of the upper surface of the first coating blade portion 36 is D, A> B> C> When it becomes D, the coating pressure applied to the web W gradually increases, and coating can be performed at the position where the coating pressure is highest in the gap D.

On the other hand, due to the pressure of the coating liquid discharged from the discharge port 42, the upper end portion of the die 14 is curved downward toward the center in the left-right direction. In order to prevent this bending, the die pressing portion 58 of the bending device 8 presses the lower surface of the base 20 of the die 14. In the present embodiment, as shown in FIG. 2, the pressing position of the die pressing portion 58 is the center in the left-right direction and directly below the center O of the rotation shaft 13 of the backup roll 12 in the front-rear direction. It is supposed to be. The reason why the position just below the center O of the rotation shaft 13 of the backup roll 12 is pressed will be described. As described above, the distance between the front portion of the upper surface of the first coating blade portion 36 corresponding to the position directly below the center O of the rotation shaft 13 of the backup roll 12 and the lower peripheral surface of the backup roll 12 is closest. The coating pressure is most applied at this close position. Therefore, in the front-rear direction, bending is most likely to occur in this portion. Therefore, in the present embodiment, the position directly below the center O (the front portion of the upper surface of the first coating blade portion 36) of the rotation shaft 13 of the backup roll 12 is pressed in the front-rear direction to prevent bending.

Further, when the base portion 20 and the first main body 16 are bent, the second main body 18 fixed to the first main body 16 can also be bent at the same time.

(5) Effect According to the present embodiment, the coating liquid supplied to the liquid reservoir 24 before the start of coating flows from the pair of left and right on-off valves 62 to the collection container 66 through the discharge hoses 64. Then, the operator observes the coating liquid flowing through the transparent or translucent discharge hose 64, and closes the on-off valve 62 when the air bubbles disappear. Therefore, when the coating is started, air is not mixed with the coating liquid inside the liquid reservoir 24. In particular, since the coating liquid is supplied at the center of the liquid reservoir 24 and discharged from the discharge passages 60 on both the left and right sides, the air inside the liquid reservoir 24 can be reliably discharged.

Further, since the first main body 16 and the base portion 20 are integrally formed, the die 14 can be bent by pressing the lower surface of the base portion 20 with the die pressing portion 58 of the bend device 8. At this time, since the first main body 16 is erected from the front portion of the base portion 20, as shown in FIG. 2, the position directly below the front surface of the first coating blade portion 36 (rotation shaft 13 of the backup roll 12). The center of the die pressing portion 58 can be arranged at a position directly below the center O of the die pressing portion 58, and the portion to which the coating pressure is most applied can be bent in the left-right direction and the front-back direction.

Further, since the first main body 16 and the second main body 18 are integrally fixed by the fastening bolts and the second main body 18 is smaller than the first main body 16, the second main body 18 is also bent at the same time by bending the first main body 16. You can bend. In particular, since the mounting space 44 is provided between the base 20 and the second main body 18, the second main body 18 can be reliably bent.

(6) Modification Example Although the liquid reservoir 24 is provided in the first main body 16 in the above embodiment, it may be provided in the second main body 18 instead.

Further, in the above embodiment, the tip of the discharge hose 64 is provided in the collection container 66, but instead of this, the discharge hose 64 is connected to a coating tank for applying the coating liquid to a pump (not shown) and coated. The structure may be such that the working liquid circulates.

Although one embodiment of the present invention has been described above, this embodiment is presented as an example and is not intended to limit the scope of the invention. These novel embodiments can be implemented in various other embodiments, and various omissions, replacements, and changes can be made without departing from the gist of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are also included in the scope of the invention described in the claims and the equivalent scope thereof.

8 ... Bend device, 10 ... Coating device, 12 ... Backup roll, 14 ... Die, 16 ... 1st body, 18 ... 2nd body, 20 ... Base, 28 ... Sim, 36 ... 1st coating blade 36, 38 ... 2nd coating blade, 40 ... Liquid passage, 42 ... Discharge port, 44 ... Mounting space, 58 ... Die pressing part, 60 ... Discharge passage, 62 ... Open / close valve, 64 ... Discharge hose, 66 ... Recovery container, 68 ... Lever

Claims (9)

A backup roll in which the web runs forward and backward on the lower peripheral surface,
With the die placed below the backup roll,
Have,
The die
The first main body whose upper part is formed into a triangular cross section by an inclined surface,
A second main body, which is combined with the rear surface of the first main body and whose upper portion is formed into a triangular cross section by an inclined surface,
With the liquid reservoir portion of the coating liquid provided in the first main body or the second main body,
The liquid passage of the coating liquid between the first main body and the second main body from the liquid reservoir, and
A slit-shaped discharge port for the coating liquid at the upper end of the liquid passage,
A shim sandwiched between the first main body and the second main body,
A supply port for the coating liquid provided at the center of the liquid reservoir in the left-right direction, and
A pair of left and right discharge passages for the coating liquid provided on the left and right of the liquid reservoir,
A pair of left and right on-off valves connected to the outlets of the pair of left and right discharge passages, respectively.
Have a,
The vertical cross-sectional shape of the liquid reservoir becomes tapered toward the top and connects to the liquid passage.
The pair of left and right discharge passages extend diagonally upward from the front of the liquid passage in the liquid reservoir, and are open to the first main body or the inclined surface formed on the upper part of the second main body, respectively.
Coating equipment. A pair of left and right on-off valves are provided in the opening portion of the inclined surface.
The on-off valve can be opened and closed by a lever.
The coating apparatus according to claim 1. A transparent or translucent discharge hose is connected to each of the pair of left and right on-off valves.
The coating apparatus according to claim 1. The discharge hose is connected to the tank of the coating liquid,
The coating apparatus according to claim 3. A collection container for the coating liquid is provided at the tip of the discharge hose.
The coating apparatus according to claim 3. It also has a rectangular parallelepiped base that extends in the left-right direction,
The first main body is integrally erected from the front portion of the upper surface of the base portion.
The second main body is arranged above the base via a mounting space.
The coating apparatus according to claim 1. A first coating blade portion having a flat upper surface is formed at the tip portion of the upper portion of the first main body.
A second coating blade portion having a flat upper surface is formed at the tip portion of the upper portion of the second main body.
A slit-shaped discharge port is opened between the first coating blade portion and the second coating blade portion.
The coating apparatus according to claim 6. The upper surface of the first coating blade portion and the upper surface of the second coating blade portion have the same height.
A perpendicular line from the center of the rotation axis of the backup roll passes through the front portion of the first coating blade portion.
The coating apparatus according to claim 7. Before starting coating on the web running on the backup roll using the coating apparatus according to claim 1.
Open the pair of left and right on-off valves and open them.
The coating liquid is supplied from the supply port to the liquid reservoir of the die.
The coating liquid is discharged from the liquid reservoir through the pair of left and right discharge passages, respectively.
When there are no air bubbles in the coating liquid discharged from each of the discharge passages, each of the on-off valves is closed.
After the pair of left and right on-off valves are closed, coating on the web is started.
Coating method.

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