JP3328721B2 - Lip coater type coating equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lip coater type coating apparatus for applying a coating liquid to a web such as a film, cloth, paper or the like.

[0002]

2. Description of the Related Art Conventionally, there is a lip coater type coating apparatus as an apparatus for coating a web with a coating liquid.

The lip coater type coating apparatus 200 has a nozzle head 14 provided below a backup roll 12 as shown in FIG.

[0004] The backup roll 12 makes the web W run from front to back by rotating.

The nozzle head 14 has a liquid holding chamber 15 therein. The coating liquid is supplied to the liquid holding chamber 15 by applying pressure from the supply pump 13, and the coating liquid is jetted upward from the liquid holding chamber 15. Then, the coating liquid is applied to the web W by the doctor edge 16 above the nozzle head 14.

[0006]

In the lip coater type coating apparatus 100, a liquid reservoir chamber 18 is provided for applying the coating liquid by the doctor edge 16. The liquid storage chamber 18 includes a lower surface of the backup roll 12 and
It comprises an upper surface of the nozzle head 14, a back plate 20 provided on the front surface of the nozzle head 14, and both side walls 40, 40.

The provision of the liquid storage chamber 18 in this manner is to prevent air from entering when applying the coating liquid, and to increase the internal pressure of the liquid storage chamber 18 to prevent air from being mixed. It is.

However, depending on the type of the web W, the type of the coating liquid, and the traveling speed of the web W, air enters from between the upper end of the back plate 20 and the lower surface of the backup roll 12, and the air is mixed with the coating liquid. To form bubbles in
The web W may be coated as it is.

In view of the above problems, the present invention is to provide a lip coater type coating apparatus which can completely prevent air from entering a liquid storage chamber.

[0010]

According to a first aspect of the present invention, there is provided a lip coater type coating apparatus in which a nozzle head is disposed below a backup roll, and the web W is caused to travel from the front to the rear by the backup roll. In a lip coater type coating apparatus for coating a coating liquid sprayed by applying pressure from a head to a lower surface of a web by a doctor edge at an upper portion of the nozzle head, a back plate is provided on a front surface of the nozzle head, , A lower surface of the backup roll, and a back surface of the back plate to form a liquid reservoir, and a groove is provided in an upper portion of the back plate along an axial direction of the backup roll, and a lower surface of the backup roll and the groove are formed. Forming an air exclusion chamber, and an air for evacuating the air inside the air exclusion chamber. Elimination port is provided, air in the air elimination opening
Air suction means is connected, and the air inside the liquid reservoir chamber is
By the pressure of the coating liquid being sprayed,
Sent to the air exclusion chamber, and the suction
Suction by the step, the back plate, the nozzle
A main plate provided on the front of the head and the main plate
The sub-plate attached to the front of the
Combining the main plate and the sub plate.
To form the groove, and the sub-plate is
The main plate is detachably attached to the main plate.
Sub-plates with different widths are attached according to the width of the web
It is something that can be replaced .

[0011]

[Operation] A lip coater type coating apparatus according to claim 1 will be described.

The web travels from the front to the rear by the backup roll, and the coating liquid is sprayed from the nozzle head while applying pressure, and the coating liquid is applied to the web by the doctor edge.

In this case, the air which is going to enter from the lower surface of the backup roll and the upper end of the back plate is naturally or forcibly eliminated from the air exhaust port by the liquid pressure of the coating liquid. Therefore, air does not enter the liquid storage chamber.

In this case, the air mixed into the liquid storage chamber is
Due to the liquid pressure of the coating liquid and the air suction means, it is discharged from the air discharge ports on both side walls.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A lip coater type coating apparatus 10 according to an embodiment of the present invention will be described below with reference to FIGS.

The same reference numerals are used for the same structures as those of the coating apparatus 10 and the lip coater type coating apparatus 100 in the prior art.

Reference numeral 22 denotes a back plate provided on the front surface of the nozzle head 14. This back plate 2
2 comprises a main plate 24 and a sub plate 26.

The main plate 24 includes the nozzle head 14
The upper end of the main plate 24 is disposed near the lower surface of the backup roll 12, and the web W runs between the backup roll 12 and the main plate 24. In addition, a concave portion is formed in the front portion of the upper surface of the main plate 24. Further, two air exhaust ports 28 are opened in this recess.

The sub-plate 26 includes a main plate 24
It is detachably attached to the front of the vehicle by bolts. The upper end of the sub-plate 26 is the backup roll 1
The web W runs between the sub-plate 26 and the backup roll 12 and is disposed near the lower surface of the second roll 2. When the sub-plate 26 is mounted on the main plate 24, an air exclusion chamber 30 on the groove is formed between the concave portion of the main plate 24 and the rear surface of the sub-plate 26. This air exclusion chamber 30 is provided with both side walls 27, 27. The size of the main plate 24 in the width direction is the same as the size of the nozzle head 14 in the width direction. The size of the sub plate 26 in the width direction is preferably adjusted to the size of the web W to be coated in the width direction. That is, since the sub-plate 26 is detachably provided to the main plate 24 by bolts, the sub-plates 26 having different widths are adjusted according to the width of the web W to be coated.
Can be replaced.

Reference numeral 32 denotes a suction device connected via a pipe 33 attached to the air discharge port 28. This sucks the air inside the air exclusion chamber 30.

An operation state of the lip coater type coating apparatus 10 having the above configuration will be described.

(1) The web W travels from the front to the back by the backup roll 12.

(2) Pressure is applied to the coating liquid from the nozzle head 14 and the coating liquid is jetted into the liquid storage chamber 18, and the doctor edge 16
Is applied to the lower surface of the web W.

(3) When the air to be mixed with the web W passes through the air exclusion chamber 30, the air exclusion port 28
From the air suction device 32.

(4) The air inside the liquid storage chamber 18 is:
Since the coating liquid is sprayed under pressure, the liquid storage chamber 1
8, it reaches the air exclusion chamber 30 and is sucked from the air exclusion port 28.

As described above, the air to be mixed with the web W and the air inside the liquid storage chamber 18 are removed from the air exclusion chamber 3.
Since it reaches 0 and is sucked from the air exhaust port 28, no air is mixed into the coating liquid.

In the above embodiment, the air suction device 32 is connected to the air exhaust port 28. However, the air exhaust port 28 may be opened without connecting the suction device 32. In this case, By the injection pressure of the coating liquid in the liquid storage chamber 18,
Since the internal pressure of the liquid storage chamber 18 increases, air reaches the air exclusion chamber 30, and the air is evacuated from the air exclusion port 28 by the pressure.

References not included in the claims of the present invention
A lip coater type coating apparatus 100 according to a first embodiment will be described with reference to FIGS.

The coating apparatus 100 is provided with air outlets 34, 34 on both side walls 40, 40 constituting the liquid storage chamber 18, and discharges air from the air outlets 34, 34. According to the principle of discharging the air, the internal pressure of the liquid storage chamber 18 is increased by the injection pressure of the coating liquid in the liquid storage chamber 18, so that the air is discharged from the air discharge ports 34, 34 by the pressure.

[0030]

As described above, according to the lip coater type coating apparatus of the first aspect, the air is excluded from the air elimination chamber by providing the air elimination chamber. It is possible to apply the coating liquid evenly and evenly without bubbles .

[Brief description of the drawings]

FIG. 1 is a side view of a lip coater type coating apparatus showing a first embodiment of the present invention.

FIG. 2 is a front view of the same.

FIG. 3 is an enlarged side view of a main part in the same manner.

FIG. 4 is a side view of a lip coater type coating apparatus showing a reference example .

FIG. 5 is an enlarged side view of a main part in the same manner.

FIG. 6 is a side view of a conventional lip coater type coating apparatus.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Coating apparatus 12 Backup roll 14 Nozzle head 16 Doctor edge 18 Liquid storage chamber 22 Back plate 24 Main plate 26 Subplate 28 Air exhaust port 30 Air exhaust chamber 32 Suction device

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-2-172555 (JP, A) JP-A-63-291662 (JP, A) JP-A-5-68927 (JP, A) Jpn. 15761 (JP, U) Hira 2-147272 (JP, U) (58) Field surveyed (Int. Cl. ⁷ , DB name) B05C 5/02 B05C 11/04 B05D 1/26

Claims (1)

(57) [Claims] 1. A nozzle head is arranged below a backup roll, a web is run from the front to the back by the backup roll, and a coating liquid sprayed by applying pressure from the nozzle head is
In a lip coater-type coating apparatus for coating a lower surface of a web with a doctor edge at an upper portion of the nozzle head, a back plate is provided on a front surface of the nozzle head, an upper surface of the nozzle head, a lower surface of the backup roll, and a lower plate of the back plate. A liquid reservoir chamber is formed by the rear surface and both side walls, a groove is provided in an upper part of the back plate along an axial direction of a backup roll, and an air exclusion chamber is formed by the lower surface of the backup roll and the groove. An air exhaust port for eliminating air inside the air exhaust chamber is provided , an air suction means is connected to the air exhaust port, and the air inside the reservoir chamber is blown with the sprayed coating liquid.
Pressure from the liquid storage chamber to the air exclusion chamber.
Suction by the suction means from the air exhaust port, and the back plate is provided on the front surface of the nozzle head.
Main plate and the front of the main plate
Consisting of a sub-plate to be attached , combining the main plate and the sub-plate
Forming the groove, the sub-plate is bolted to the main plate
Detachable to the width of the web to be coated
And a sub-plate having a different width can be replaced .