JP6367074B2 - Die bleeding method - Google Patents

Description

The present invention relates to an air vent methods die to apply the coating solution to the web.

  Conventionally, when a coating liquid is applied to a long web, the web is conveyed at a constant speed, and coating is performed using a die. The die is formed of a first main body, a second main body, and a shim, and a liquid reservoir is provided therein. A coating liquid is supplied to a liquid reservoir by a pump, and the coating liquid is discharged from the liquid reservoir through a slit-like discharge port, and applied to one side of the web.

JP-A-9-94510 JP 2001-179156 A

  When the coating liquid is applied to the web with the die as described above, if air is mixed in the coating liquid supplied from the pump or if air remains inside the die, this air will be applied to the coating liquid. There is a problem that air bubbles are mixed in the coating layer of the web, the coating thickness is uniform and the coating is not performed.

The present invention has been made in view of the above problems, and an object thereof is to provide a venting method of the die that can be pulled out of the air inside the die.

The present invention relates to a method for ventilating a die in which a coating liquid is ejected from a front end portion of a web conveyed in a vertical direction, and is applied to the die. A second body disposed opposite to the lower surface; a sheet-like shim sandwiched between the first body and the second body; and the coating liquid provided on the upper surface of the second body. Formed by the shim between the upper surface of the second main body and the lower surface of the first main body, a liquid reservoir for storing, a supply port for supplying the coating liquid to the liquid reservoir A discharge passage for the applied coating liquid, a slit-shaped discharge outlet for the coating liquid provided at a front end of the discharge passage, and both left and right side portions of the liquid reservoir, a pair of left and right air vent holes penetrating through the left and right side portions, the die having a close the discharge port A detachable cover, the discharge port of the die is closed by the cover, the coating liquid is supplied from the supply port to the liquid reservoir, and from the pair of left and right air vent holes of the die, In this method , the air accumulated in the liquid reservoir is removed .

According to another aspect of the present invention, there is provided a die air venting method in which a coating liquid is ejected from a lower end portion of a web conveyed in a lateral direction, and the first main body having a flat front surface is formed. A second body disposed opposite to the front surface of the sheet, a sheet-like shim sandwiched between the first body and the second body, and the coating liquid provided on the rear surface of the second body By a shim located between the rear surface of the second main body and the front surface of the first main body; a liquid reservoir portion for storing the liquid; a supply port for supplying the coating liquid to the liquid reservoir portion ; The formed liquid discharge passage, the slit-shaped coating liquid discharge port provided at the lower end of the discharge passage, and the left and right side portions of the liquid reservoir, the second body fort a pair of left and right air vent holes penetrating through the left and right side portions, the die having a said discharge port of A detachable cover, the discharge port of the die is closed with the cover, the coating liquid is supplied from the supply port to the liquid reservoir, and from the pair of left and right air vent holes of the die, In this method , the air accumulated in the liquid reservoir is removed .

  According to the present invention, air escapes from a pair of left and right air vents provided on both sides of the die, and no air remains inside the die.

It is a longitudinal cross-sectional view of the die | dye in the state which has extracted the air in Embodiment 1. FIG. It is the sectional view on the AA line in FIG. It is a disassembled perspective view of die | dye. It is a longitudinal cross-sectional view of the die during coating. It is explanatory drawing of a coating apparatus. It is a longitudinal cross-sectional view of the die | dye in the state which has extracted the air in Embodiment 2. FIG. It is a longitudinal cross-sectional view of the die under coating in Embodiment 2.

  Hereinafter, a die 10 according to an embodiment of the present invention and a method for removing air from the die 10 will be described with reference to the drawings.

Embodiment 1

  The coating apparatus 1 using the die | dye 10 of Embodiment 1 is demonstrated based on FIGS.

(1) Structure of the coating apparatus 1 The structure of the coating apparatus 1 is demonstrated based on FIG. 4, FIG. In the coating apparatus 1, the die 10 of the present embodiment is arranged in the lateral direction (horizontal direction). In the vicinity of the front end portion of the die 10, a long web W such as a film, a metal foil, a metal net, a fabric, and paper is conveyed from the bottom to the top by the guide roll 2 and the guide roll 3 in the vertical direction at a constant conveyance speed. The coating liquid is applied to one side of the web W by the die 10. The coating liquid is stored in the tank 4 and is supplied from the supply pipe 6 to the die 10 by the pump 5. Further, as will be described later, the coating liquid mixed with air discharged from the air vent hole 28 of the die 10 is circulated to the tank 4 through the discharge pipe 30.

(2) Structure of Die 10 The structure of the die 10 will be described with reference to FIGS. The die 10 is an approximately rectangular parallelepiped made of metal and is disposed horizontally, and its longitudinal direction is disposed in parallel with the width direction of the web W. The front portion of the die 10 facing the web W has a triangular shape with a tapered longitudinal section, and a slit-like discharge port 22 is provided at the front end portion of the die 10 so that the coating liquid is applied in the width direction of the web W. Discharge. As shown in FIG. 3, the die 10 includes an upper main body 12 that is a first main body, a lower main body 14 that is a second main body, and a U-shaped thin sheet-like shim sandwiched between the upper main body 12 and the lower main body 14. 17 and fixed by a plurality of bolts.

  The front surface of the upper body 12 is inclined downward as before, and the lower surface is formed as a flat surface.

  The front surface of the lower body 14 is inclined upward as before, and a liquid reservoir 16 is formed on the upper surface by a recess. The liquid reservoir 16 extends in the width direction as shown in FIGS. As shown in FIG. 1, the liquid reservoir 16 becomes smaller as before, and the discharge passage 20 is continuously formed in the width direction. The discharge passage 20 is formed by a cutout portion 18 of the shim 17 sandwiched between the upper main body 12 and the lower main body 14, and a front end portion of the discharge passage 20 is a slit-like discharge port 22. That is, the coating width is determined by the dimension in the width direction of the notch 18 at the center of the U-shaped shim 17.

  A supply port 24 for supplying the coating liquid is formed at the center of the rear surface of the lower main body 14, and is connected to the center of the rear surface of the liquid reservoir 16 by a supply passage 26. As shown in FIG. 1, the supply passage 26 is formed in a lateral direction (horizontal direction) from the supply port 24, and then bent so as to incline upward and reach the liquid reservoir 16.

  A pair of left and right air vent holes 28 are formed on both sides of the lower main body 14, that is, on both sides of the die 10. The air vent hole 28 is formed at the upper end of the rear portion of the liquid reservoir 16 and penetrates both side portions of the lower main body 14 horizontally.

  A supply pipe 6 for supplying the coating liquid from the pump 5 is connected to the supply port 24. A discharge pipe 30 is connected to the air vent hole 28, a valve 32 is provided in the middle of the discharge pipe 30, and a discharge port at the tip of the discharge pipe 30 is arranged in the tank 4.

(3) Air venting method and coating method Next, the air venting method and coating method of the die 10 will be described.

  First, as shown in FIGS. 1 and 2, the operator closes the discharge port 22 by covering the slit-shaped discharge port 22 spreading in the width direction with a cover 23. For example, the cover 23 is a silicon adhesive tape, which is attached to the discharge port 22 and closed in an airtight state.

  Second, the operator opens the pair of left and right valves 32, 32.

  Third, the operator drives the pump 5 to supply the coating liquid in the tank 4 to the die 10 at a constant pressure. The coating liquid supplied from the pump 5 enters the inside of the die 10 from the supply port 24 through the supply pipe 6 and enters the liquid reservoir 16 through the supply passage 26. The infiltrated coating liquid enters while pushing air (bubbles) inside the supply pipe 6 and air (bubbles) inside the discharge passage 20 and the liquid reservoir 16. When the coating liquid that has entered the liquid reservoir 16 fills the liquid reservoir 16, the pushed air (bubbles) is discharged from the pair of left and right air vent holes 28, 28 and flows to the tank 4 through the discharge pipe 30.

  Fourth, the operator observes the coating liquid discharged from the discharge pipe 30 to the tank 4. The discharge is initially only air but gradually becomes mixed with the coating liquid, and then only the coating liquid is discharged. At this time, the operator completely releases the air from the die 10. It is determined that the valve has been removed, and the pair of left and right valves 32, 32 are closed and the pump 5 is temporarily stopped.

  Fifth, the operator removes the cover 23 that closes the discharge port 22.

  Sixth, as shown in FIG. 5, the worker conveys the web W in the vertical direction from the bottom to the top by the guide rolls 2 and 3.

  Seventh, as shown in FIG. 4, the operator drives the pump 5 again and applies the coating liquid to the web W with a predetermined width and a predetermined thickness from the discharge port 22 of the die 10. In this case, the coating width is determined by the width of the discharge port 22 (the width of the cutout portion 18 of the shim 17), and the coating thickness is per unit time (for example, per minute) supplied by the pump 5. It is determined by the supply amount of the coating liquid.

(4) Effect In the coating apparatus 1 of the present embodiment, air inside the die 10 is extracted from the pair of left and right air vent holes 28 before coating, so that air (bubbles) is generated in the coating liquid during coating. There is no mixing.

  Further, since the liquid reservoir 16 is formed in the lower main body 14 and the air vent holes 28 are provided at the upper end portions on both sides of the liquid reservoir 16, air discharged from the liquid reservoir 16 or the like (bubbles) ) Always reaches the air vent hole 28 and is discharged. Therefore, air (bubbles) does not remain in other parts of the liquid reservoir 16. In particular, since the lower surface of the upper body 12 is formed as a flat surface, there is no room for air to enter, and air (bubbles) always reaches the position of the air vent hole 28. Even if air (bubbles) enters the discharge passage 20, all the air is discharged at the first time when the coating is started. Therefore, in the state where the web W reaches a constant conveyance speed, the coating layer There is no air in it.

  Further, the supply passage 26 extends in the lateral direction (horizontal direction) on the supply port 24 side and is inclined upward thereafter, so that air does not accumulate inside the supply passage 26. That is, since air tends to move upward, air is surely pushed into the liquid reservoir 16 by the coating liquid.

(5) Modified Example In the above embodiment, the supply port 24 is provided at the center of the rear surface of the lower main body 14. Instead, the supply port 24 is provided at the center of the lower surface of the lower main body 14 and applied from the lower surface of the liquid reservoir 16. A liquid may be supplied.

Embodiment 2

  Next, the coating apparatus 1 of Embodiment 2 is demonstrated based on FIG. 6 and FIG.

  The difference between the present embodiment and the coating apparatus of the first embodiment is that the die 10 is arranged in the horizontal direction (horizontal direction) in the first embodiment, but in this embodiment, as shown in FIG. 6, the vertical direction (vertical direction). To arrange. Therefore, in this embodiment, as shown in FIG. 7, the web W is conveyed from the front to the back in the horizontal direction (horizontal direction), and the coating liquid is applied to the upper surface of the web W.

  The die 10 of this embodiment is formed of a front main body 34, a rear main body 36 and a shim 17. The rear surface of the front body 34 is a flat surface, and the rear body 36 is fixed with the shim 17 sandwiched between the flat surfaces.

  A liquid reservoir 16 is formed on the front surface of the rear main body 36, and a cutout portion 18 is formed in the shim 17. When the front main body 34 and the rear main body 36 are combined with the shim 17 interposed therebetween, the discharge passage 20 is formed by the notch portion 18, and the slit-shaped discharge port 22 is formed at the lower end of the die 10.

  A supply port 24 is formed on the rear surface of the rear body 36, and a supply passage 26 is formed straight from the supply port 24 to the liquid reservoir 16.

  A pair of left and right air vent holes 28 are formed at the upper ends of both sides of the liquid reservoir 16 in the rear body 36.

  Even in the coating apparatus 1 of the present embodiment, before coating the coating liquid on the upper surface of the web W as shown in FIG. 6, the discharge port 22 is covered by the cover 23 as shown in FIG. The coating liquid is supplied by the pump 5, and the air accumulated in the liquid reservoir 16 is extracted from the pair of left and right air vent holes 28. Therefore, the air accumulated in the liquid reservoir 16 or the like can be removed before coating, and air is not mixed into the coating layer.

  Moreover, since the air vent hole 28 is provided in the upper end part of the both sides of the liquid reservoir 16, the air can be surely removed.

  In the second embodiment, as shown in FIG. 6, the web W is transported from the front to the back, but instead, the web W may be transported from the back to the front with respect to the die 10.

Example of change

  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 forms, and various omissions, replacements, and changes can be made without departing from the spirit of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

DESCRIPTION OF SYMBOLS 1 ... Coating apparatus, 10 ... Die, 12 ... Upper main body, 14 ... Lower main body, 16 ... Liquid reservoir part, 17 ... Shim, 20 ... Discharge passage, 22 ... Discharge port, 24 ... Supply port, 26 ... Supply passage, 28 ... Air vent, 30 ... Discharge pipe, 32 ... Valve

Claims (7)

In the air bleeding method of the die , which is applied by discharging the coating liquid onto the web conveyed in the vertical direction from the front end,
A first body having a flat bottom surface;
A second body disposed to face the lower surface of the first body;
A sheet-like shim sandwiched between the first body and the second body;
A liquid reservoir for storing the coating liquid provided on the upper surface of the second body;
A supply port for supplying the coating liquid to the liquid reservoir,
A discharge passage for the coating liquid formed by the shim between the upper surface of the second body and the lower surface of the first body;
A slit-shaped discharge port of the coating liquid provided at the front end of the discharge passage;
A pair of left and right air vent holes penetrating the left and right side portions of the second main body on the left and right side portions of the liquid reservoir ;
And die with,
A removable cover for closing the discharge port;
The discharge port of the die is closed with the cover,
Supplying the coating liquid from the supply port to the liquid reservoir;
From the pair of left and right air vent holes of the die, the air accumulated in the liquid reservoir is removed,
How to vent the die. It said supply port is provided on the rear surface of the second body,
The method of venting a die according to claim 1. After the supply passage from the supply port of the second main body to the liquid reservoir extends in the front-rear direction from the supply port, the supply passage is inclined upward to the liquid reservoir.
The method for venting a die according to claim 2. In the air venting method of the die , which is applied by discharging the coating liquid from the lower end to the web conveyed in the lateral direction,
A first body having a flat front surface;
A second body arranged to face the front surface of the first body;
A sheet-like shim sandwiched between the first body and the second body;
A liquid reservoir for storing the coating liquid provided on the rear surface of the second body;
A supply port for supplying the coating liquid to the liquid reservoir,
A discharge passage for the coating liquid formed by the shim between the rear surface of the second body and the front surface of the first body;
A slit-shaped discharge port of the coating liquid provided at the lower end of the discharge passage;
A pair of left and right air vent holes penetrating the left and right side portions of the second main body on the left and right side portions of the liquid reservoir ;
And die with,
A removable cover for closing the discharge port;
The discharge port of the die is closed with the cover,
Supplying the coating liquid from the supply port to the liquid reservoir;
From the pair of left and right air vent holes of the die, the air accumulated in the liquid reservoir is removed,
How to vent the die. It said supply port is provided on the front surface of the second body,
The method for venting a die according to claim 4. The web is transported from front to back or back to front with respect to the die;
The method for venting a die according to claim 4. A discharge pipe for the coating liquid is connected to each of the pair of right and left air vent holes, and a valve is provided for each of the discharge pipes.
The method of venting a die according to claim 1 or 4.

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