JP2005238178A - Lip coater type coating apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lip coater type coating apparatus by which a plurality of kinds of coating liquids are applied with prescribed coating width in a width direction of a web and further their superposing parts can be formed. <P>SOLUTION: In this coating apparatus, a plurality of compartments 44 are formed by arranging a partition wall 42 partitioning between adjoining liquid exits 24, 24 correspondingly to the coating width in a 2nd liquid pool chamber 32 and a mixing space for mixing adjoining coating liquids is formed between the front end part of the partition wall 42 and the blade edge 18a of a doctor edge 18. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a lip coater type coating apparatus in which a nozzle head having a doctor edge is disposed below a backing roll, and a coating liquid is sprayed from the nozzle head under pressure to be applied to a web.

  As described above, as a lip coater type coating apparatus for coating a coating liquid on a web such as a film or paper, the following is known (Japanese Patent Publication No. 6-223).

  That is, a comma type doctor edge is provided on the upper surface of the nozzle head, a first liquid reservoir chamber is provided in the width direction inside the nozzle head, and the front surface of the nozzle head faces the lower peripheral surface of the backing roll. A liquid reservoir wall is erected while leaving a gap for running the web, and a second liquid reservoir chamber is formed by the lower peripheral surface of the backing roll, the liquid reservoir wall, the doctor edge, and the upper surface of the nozzle head.

Further, a partition wall is provided in the second liquid reservoir chamber of the nozzle head, and the second liquid reservoir chamber is divided into a plurality of sections in the width direction. This partition wall partitions only the upper part of the second liquid reservoir chamber and does not partition the lower part of the second liquid reservoir chamber. And it is possible to carry out the stripe process which makes a web run under the backing roll, and forms a coating part and an uncoated part alternately on a web.
JP 7-275773 A

  In the lip coater-type coating having the above-described configuration, it is possible to perform stripe processing in which coated portions and uncoated portions are alternately formed in the width direction. However, recently, there is a demand for an apparatus that applies different types of coating liquids adjacent to each other in the width direction and coats a part of the different types of coating portions.

  Therefore, in view of the above problems, the present invention provides a lip coater type coating apparatus capable of coating a plurality of types of coating liquids with a predetermined coating width in the width direction of the web, and forming an overlapping portion thereof. It is to provide.

  In the invention according to claim 1, a nozzle head having a doctor edge is arranged below the backing roll, a plurality of types of coating liquids are sprayed from the nozzle head under pressure, and the lower peripheral surface of the backing roll A lip coater type coating device that coats the plurality of types of coating liquids with a predetermined coating width in a width direction of a web traveling from the front to the rear of the nozzle head, wherein a doctor edge is formed on an upper surface of the nozzle head Is provided, and at least two first liquid reservoir chambers are provided in the width direction inside the nozzle head, and different types of first liquid reservoir chambers adjacent to each other among the plurality of first liquid reservoir chambers are provided. A coating liquid outlet from each first liquid reservoir chamber is provided on the upper surface of the nozzle head positioned in front of the doctor edge, and is provided at the front of the nozzle head. Before A liquid storage wall is erected while leaving a gap for running the web toward the lower peripheral surface of the backing roll, and a pair of side walls are arranged on both sides between the nozzle head and the backing roll, A side wall, a lower peripheral surface of the backing roll, the liquid reservoir wall, the doctor edge, and a second liquid reservoir chamber closed by the upper surface of the nozzle head are formed, and a partition wall that partitions between the adjacent liquid outlets is By arranging at least one second liquid reservoir chamber corresponding to the coating width, the second liquid reservoir chamber is partitioned into at least two compartment chambers, and the front end of the partition wall and the doctor A mixing space in which adjacent coating liquids are mixed is formed between the edge blade edge, and the volume of each compartment gradually decreases as it approaches the blade edge of the doctor edge, and the blockage is blocked. A lip coater type coating apparatus, characterized in that each compartment is kept higher than the atmospheric pressure.

  The invention according to claim 2 is to increase the mixing space by increasing the distance from the front end portion of the partition wall to the blade edge of the doctor edge in a state where the front portion of the partition wall covers the doctor edge. The lip coater type coating apparatus according to claim 1, wherein a dimension in a width direction of an overlapping portion of adjacent coating liquids is widened.

  The invention according to claim 3 is the lip coater type according to claim 1, wherein the front part of the partition wall is formed with a proximity part for bringing different types of coating liquids accumulated in the adjacent compartments closer to each other. It is a coating device.

  The invention according to claim 4 is the lip coater type coating apparatus according to claim 3, wherein the proximity portion of the partition wall becomes thinner toward the front.

  The invention according to claim 5 is provided with a pressure gauge for measuring an internal pressure for each compartment to which at least one kind of coating liquid is sent, and the pressure measured by each pressure gauge is set to a constant pressure. 2. The lip coater type coating apparatus according to claim 1, further comprising control means for controlling the amount of coating liquid supplied to the compartment.

  According to a sixth aspect of the present invention, the volume of each first liquid reservoir chamber is changed corresponding to each coating width, and the volume of the first liquid reservoir chamber corresponding to the coating width H1 is changed. 2. The lip coater type coating apparatus according to claim 1, wherein the lip coater type coating apparatus is larger than a volume of the first liquid reservoir chamber corresponding to a work width H2 (where H1> H2).

  The lip coater type coating apparatus of the invention according to claim 1 will be described.

  The web is run from the front of the nozzle head to the rear of the lower circumference of the backing roll. Further, different types of coating liquids are supplied to the plurality of first liquid reservoirs of the nozzle head, respectively. In this case, different types of coating liquids are supplied to at least the adjacent first liquid reservoir chambers.

  The coating liquid from these first liquid reservoirs is respectively ejected from the liquid outlet and flows into the compartments partitioned by the partition walls. Each compartment is gradually smaller in volume as it approaches the blade edge of the doctor edge, and each closed compartment is maintained at a pressure higher than atmospheric pressure. As the blade edge approaches, the pressure of the coating liquid increases, and a different type of coating liquid is applied to the surface of the web for each compartment. A mixed space is formed between the front end of the partition wall and the blade edge of the doctor edge, and adjacent coating liquids are mixed in this mixing space, so that different types of mixed coating liquids remain as they are on the web surface. Painted on. That is, the part coated by this mixed space becomes the overlapping part of two types of coating liquids. Moreover, since two types of coating liquids are mixed in the vicinity where the pressure becomes highest, the mixing is promoted, and the coating liquid in which the mixing is promoted can be applied in the overlapping portion.

  In the lip coater type coating apparatus of the invention according to claim 2, the mixing space is increased by increasing the distance from the front end portion of the partition wall to the blade edge of the doctor edge in a state where the front portion of the partition wall covers the doctor edge. Can be formed. The larger the mixing space is, the wider the overlapping portions of adjacent coating liquids are.

  In the lip coater type coating apparatus of the invention according to claim 3, the front part of the partition wall is formed in the mixing space by forming a proximity part that brings different types of coating liquids in adjacent compartments close to each other. The coating liquids approach each other until the two kinds of coating liquids can be mixed more reliably.

  In the lip coater type coating apparatus according to the fourth aspect of the present invention, the proximity portion of the partition wall is made thinner toward the front so that the coating liquid reaching the mixing space approaches.

  A lip coater type coating apparatus of the invention according to claim 5 will be described.

  A pressure gauge that measures the internal pressure is provided for each compartment to which at least one type of coating liquid is sent, and the amount of coating liquid supplied to each compartment is controlled so that the pressure measured by each pressure gauge is constant. Control by means. As a result, even when coating liquids having different viscosities or the like are sent to different compartments, they can be adjusted to have a predetermined thickness.

  A lip coater type coating apparatus of the invention according to claim 6 will be described.

  By increasing the volume of the first liquid reservoir chamber as the coating width is larger, the pressure in the width direction in the first liquid reservoir chamber can be made uniform, and even coating can be performed even with a large coating width. it can. On the other hand, even if the volume is small in the first liquid reservoir chamber corresponding to the compartment having a small coating width, the pressure tends to be uniform because the coating width is small.

(First embodiment)
Hereinafter, a lip coater type coating apparatus 10 according to a first embodiment of the present invention will be described with reference to FIGS.

(1) Coating state of web W The state which applied the coating liquid to the web W in the lip coater type coating apparatus 10 of this embodiment is demonstrated based on FIG.

  In this embodiment, A liquid and B liquid are used as the coating liquid, and the A liquid and the B liquid are applied alternately, and an overlapping portion is provided at each boundary portion.

  As shown in FIG. 7, from the left side of the web W, the A liquid part, the overlapping part, the B liquid part, the overlapping part, the A liquid part, the overlapping part, the B liquid part, the overlapping part, and the A liquid part are applied. The overlapped portion is coated with a coating liquid in which the A liquid and the B liquid are mixed.

(2) Configuration of Lip Coater Type Coating Apparatus 10 The configuration of the coating apparatus 10 will be described based on FIGS.

  The backing roll 12 runs the web W from the right side to the left side of the coating apparatus 10, that is, from the front side to the rear side in FIG. 1 while supporting the web W such as paper or film.

  Below the backing roll 12, a nozzle head 14 for applying a coating liquid to the web W is disposed. The head main body 16 of the nozzle head 14 has substantially the same width as the backing roll 12, and a doctor edge 18 is provided on the upper part.

  This doctor edge 18 is a comma type doctor edge 18 formed in a longitudinal section arc shape. The web W travels through the gap between the backing roll 12 and the doctor edge 18. The front surface of the head body 16 is formed in a flat surface.

  The lid body 22 of the head body 16 is detachably attached to the front surface of the head body 16 with bolts. On the rear surface of the lid 22, five concave portions are provided in the width direction. By combining the head main body 16 and the lid body 22 with bolts, five first liquid reservoir chambers 26-1 in the width direction inside the nozzle head 14 are formed by the front surface of the head main body 16 and the five concave portions of the lid body 22. , 26-2, 26-3, 26-4, and 26-5.

  As shown in FIG. 3, in the upper part of the first liquid reservoir chambers 26-1, 26-2, 26-3, 26-4, 26-5, outflow passages 28-1, 28-2, 28-3, 28-4 and 28-5 are continuously formed in the width direction with the first liquid reservoir chambers 26-1, 26-2, 26-3, 26-4, and 26-5. The outflow passages 28-1,... 28-5 extend upward, and liquid outlets 24-1, 24-2, 24-3, between the front part of the doctor edge 18 and the front end part of the nozzle head 14. 24-4 and 24-5 are provided.

  Each of the first liquid reservoir chambers 26-1,... 26-5 has coating liquid supply ports 36-1, 36-2,. Liquid B is supplied under pressure by pumps 38 and 40. Specifically, the pump 38 for supplying the A liquid is connected to the supply ports 36-1, 36-3, 36-5, and the pump 40 for supplying the B liquid with pressure is supplied by the supply port 36-2, 36-4.

  The liquid reservoir wall 30 has substantially the same width as the lid body 22 and is detachably attached to the upper part of the front surface of the lid body 22 with bolts (not shown). A gap for traveling of the web W is left between the upper end of the liquid reservoir wall 30 and the lower peripheral surface of the backing roll 12.

  The second liquid reservoir chamber 32 has a space formed by the front surface of the doctor edge 18, the upper surface of the lid 22, and the rear surface of the liquid reservoir wall 30, and both sides of this space are located below the upper surface of the nozzle head 14 and the backing roll 12. It is formed by closing with a pair of side walls 34, 34 arranged between the peripheral surface. The internal volume of the second liquid reservoir chamber 32 is larger than the volume of the outflow path 28 because it is in a state of expanding forward from the liquid outlet 24 of the outflow path 28.

  The second liquid reservoir 32 is divided into four compartments 44-1, 44-2, 44-3, 44-4, 44 by four partition walls 42-1, 42-2, 42-3, 42-4. It is divided into -5. The left compartment 44-1 is closed by the side wall 34, the partition wall 42-1, the lower peripheral surface of the backing roll 12, the upper surface of the nozzle head 14, and the liquid reservoir wall 30, and the right compartment 44-5 is also used. It is the same. Further, the partition chamber 44-2 located in the middle is closed by a pair of partition walls 42-1 and 42-2, the upper surface of the nozzle head 14, the lower peripheral surface of the backing roll 12, and the liquid storage wall 30. The same applies to the other compartments 44-3 and 44-4.

  Each of the compartments 44-1,... 44-5 corresponds to each of the liquid outlets 24-1,... 24-5, and as shown in FIG. Liquid A is supplied, liquid B is supplied to the compartment 44-2, liquid A is supplied to the compartment 44-3, liquid B is supplied to the compartment 44-4, and the rightmost compartment is supplied. A liquid is supplied to 44-5.

  The liquid reservoir wall 32 corresponding to the left compartment 44-1 is provided with a pressure sensor 46 for measuring the pressure of the liquid A, and the compartment 44-2 is used for measuring the pressure of the liquid B. A pressure sensor 48 is provided on the liquid reservoir wall 30.

(3) Configuration of Partition Wall 42 and Side Wall 34 The configuration of the partition wall 42 and the side wall 34 will be described with reference to FIGS. 2, 4, and 6.

  As shown in FIG. 2, the front end portion of the side wall 34 on the left side is formed in an inclined surface so that the liquid A spreads to the left side. The front end portion of the right side wall 34 is also formed with an inclined surface so that the liquid A spreads to the right side.

  The partition wall 42 is formed so as to partition the second liquid reservoir chamber 32, and is cut out so that the adjacent coating liquid is mixed only in the vicinity of the blade edge. That is, the partition wall body 50 that is disposed on the upper surface of the lid 22 and the nozzle head 16 and completely partitions the second liquid reservoir chamber 32, and the proximity portion that protrudes from the front upper part of the partition wall body so as to cover the rear side of the doctor edge 52. The upper surface of the partition wall main body 50 and the upper surface of the proximity portion 52 have an arc shape and are formed so as to be substantially parallel to the lower peripheral surface of the backing roll 12. Can run. Further, the front end portion of the proximity portion 52 to the blade edge 18a of the doctor edge 18 are notched as described above, and a mixing space is formed by the lower peripheral surface of the backing roll 12 and the doctor edge 18 portion. Is done.

  As shown in FIG. 4, the proximity portion 52 of the partition wall 42 has a triangular planar shape, and is elongated toward the front end portion.

(4) Electrical configuration of coating apparatus 10 The electrical configuration of the coating apparatus 10 will be described with reference to FIG.

  The control unit 54 formed of a microcomputer is used for running the A liquid pump 38, the B liquid pump 40, the A liquid pressure sensor 46, the B liquid pressure sensor 48, and the backing roll 12. A motor 56 is connected.

  In addition, you may connect the thickness sensor which measures the thickness of A liquid part, and the thickness sensor which measures the coating thickness of B liquid part as needed.

(5) Operational state of the coating apparatus 10 A method of applying the A liquid and the B liquid as shown in FIG. 7 using the coating apparatus 10 having the above configuration will be described.

  The A liquid and the B liquid are respectively supplied to the five first liquid reservoir chambers 26 by the A liquid pump 38 and the B liquid pump 40. The coating liquid supplied to each first liquid reservoir chamber 26 spreads in the first liquid reservoir chamber 26 equally in the width direction and reaches the liquid outlet 24 through the outflow passage 28. When reaching the liquid outlet 24, the coating liquid flows upward as shown in FIG. 6 and flows forward together with the web W traveling forward by the backing roll 12. The doctor edge 18 is formed in an arc shape, and its volume decreases as it approaches the blade edge 18a, so that the pressure applied to the coating liquid increases. Then, when the pressure is highest at the position of the blade edge 18a, the coating liquid is applied to the web W with a certain thickness. As shown in FIG. 2, the coating liquid moves along the partition wall 42, but the partition wall body 50 is completely separated from the adjacent compartment 44. However, the adjacent coating liquids approach each other by flowing through the proximity portion 52 of the partition wall 42 and are mixed with the adjacent coating liquids in the mixing space. In this mixing space, since the pressure of the coating liquid is high, the coating liquids are mixed well, and when the coating is applied by the blade edge 18a, the mixed coating liquid is applied. Therefore, as shown in FIG. 7, the coating liquid mixed with a predetermined width is applied to the overlapped portion.

  The relationship between FIG. 6 and FIG. 7 will be described. The part coated by the separation space in FIG. 6 is the separation section in FIG. 7, and the part coated by the adjacent space in FIG. 6 is the proximity section in FIG. The part is a mixed section.

(6) Adjustment of the size of the overlapping portion The dimension in the width direction of this overlapping portion is determined by the following two factors.

  The first element is the size of the mixing space. As shown in FIG. 6, when the dimension of the doctor edge 18 is L and the dimension of the proximity portion 52 is M, the mixing space becomes larger as the length of LM increases, and the amount of coating liquid to be mixed As the number increases, the spread of the overlapping portion increases. And when this proximity part 52 does not exist, ie, when the overlapping part (M = 0) of the partition wall 42, the largest overlapping part is applied.

  On the contrary, when the size of the mixing space is made as small as possible and the distance between the blade edge 18a and the tip of the partition wall 42 is 1 mm or less, the overlapping portion disappears, and the liquid A and the liquid B are closely aligned without the overlapping portion. Can be applied in the state.

  The second element is determined by the dimension S in the width direction of the upper surface of the partition wall 42.

  As shown in FIG. 4, the larger the dimension S in the width direction of the upper surface of the partition wall, the larger the overlapping portion.

(7) Adjustment of coating thickness Since it is necessary to make the coating thickness of A liquid into a fixed coating thickness, it is controlled by the pressure sensor 46. That is, the internal pressure of the compartment 44-1 where the liquid A is measured, which is measured by the pressure sensor 46, is always measured, and the supply amount of the pump 38 for the liquid A is controlled so that the measured internal pressure is within a predetermined range. To do. When the pressure measured by the pressure sensor 46 for A liquid increases, the supply amount of the A liquid pump 38 is decreased, and when the internal pressure decreases, the supply amount of the A liquid pump 38 is increased.

  Similarly, the B liquid pump is feedback-controlled so that the internal pressure of the B liquid compartment 44-2 becomes substantially constant.

  Thereby, the coating thickness of the coating part for A liquid and the coating thickness of the coating part for B liquid become constant, respectively.

  In addition, feedback control may be performed so that the coating thickness detected by the thickness sensor that measures the coating thickness of the A liquid and the thickness sensor that measures the coating thickness of the B liquid is constant.

(Modification 1)
In the said embodiment, since the width | variety of the coating part for A liquid and the coating part for B liquid was the same, the volume of 1st liquid reservoir chamber 26-1, ... 26-5 is all the same. .

  However, when the coating width H1 of the coating part for the A liquid is large and the coating width H2 of the coating part for the B liquid is small (H1> H2), the first liquid reservoir chamber 26 for the A liquid The volume V1 of -1, 26-3 and 26-5 is made larger than the volume V2 of the first liquid reservoir chambers 26-2 and 26-4 for the B liquid (V1> V2).

  Since it is necessary to make the pressure in the width direction of the first liquid reservoir chamber 26 uniform as the coating width is larger, the first liquid reservoir chambers 26-1 and 26-3 for the liquid A having a larger coating width. , 26-5 is increased to make the pressure in the width direction of the coating portion supplied from the liquid outlet 24 uniform. In the first liquid reservoir chambers 26-2 and 26-4 for the B liquid having a small coating width, it is easy to make the pressure uniform even if the volume is reduced. Therefore, the first liquid reservoir chamber 26 for the A liquid Reduce the volume.

(Modification 2)
The shape of the proximity portion 52 of the partition wall 50 in the first embodiment is an acute angle as shown in FIG. 4, but may be an obtuse angle shape as shown in FIG. 8.

(Modification 3)
As shown in FIG. 9, the front end portion of the proximity portion 52 of the partition wall 50 may be cut out in an arc shape to mix adjacent coating liquids.

(Modification 4)
As shown in FIG. 10, the adjacent coating liquid may be mixed by inclining the upper surface of the proximity portion 52 of the partition wall 50.

(Modification 5)
As shown in FIG. 11, the adjacent portion 52 of the partition wall 50 may be a corrugated plate and may be formed so as to be depressed downward toward the center portion, and adjacent coating liquids may be mixed.

(Modification 6)
In the above embodiment, two types of liquid A and liquid B are used. However, the present invention is not limited to this, and three or more types of coating liquid can be applied in the width direction. Different coating liquids are supplied. Further, in this case, since the pressure sensors need to be measured for each different type of coating liquid, three or more pressure sensors are provided so that the internal pressure of the compartment 44 for each different type of coating liquid can be measured. It is provided.

(Modification 7)
In the above-described embodiment, the liquid A and the liquid B are supplied by the two pumps 38 and 40, respectively. However, a pump may be provided for each compartment 44 to supply the coating liquid individually.

(Modification 8)
In the said embodiment, as shown in FIG. 2, the front-end part of the side wall 34 on the left side is formed in the inclined surface, and it forms so that A liquid may spread on the left side. The front end portion of the right side wall 34 is also formed with an inclined surface so that the liquid A spreads to the right side. Alternatively, the left and right side walls 34 and 34 may be straight instead of the inclined surface.

(Second Embodiment)
Next, a second embodiment will be described.

  The difference between the first embodiment and this embodiment is the shape of the upper surface of the doctor edge 18.

  That is, in the first embodiment, the upper surface is formed in an arc shape, but in this embodiment, two surfaces extending in the width direction of the web W are formed obtusely in a straight line shape in the width direction. The rate of decrease in the volume of the second liquid reservoir chamber 32 is abruptly changed at the linear portions coupled in a straight line.

  Also in the present embodiment, when the web W is carried into the second liquid reservoir chamber 32, air does not enter from the gap of the liquid reservoir wall 30, so that no bubbles are generated on the coating surface. .

  The present invention is suitable for coating different types of coating liquid on the upper surface of a web such as a film, cloth, metal stay, or metal net. In particular, it is most suitable when different types of coating liquids are applied in layers.

It is a longitudinal cross-sectional view of the lip coater type coating device which shows one Embodiment of this invention. It is a top view of the nozzle bed 14 of the state which removed the backing roll 12. FIG. 1 is a transverse sectional view of a coating apparatus 10. FIG. It is a perspective view of a partition wall. 2 is a block diagram showing an electrical configuration of the coating apparatus 10. FIG. 3 is an enlarged vertical sectional view of a compartment 44. FIG. It is a top view which shows the coating state of a web. It is a perspective view of the example 2 of a partition wall modification. It is a perspective view which shows the modification 3 of a partition wall. It is a perspective view which shows the example 4 of a partition wall modification. It is a perspective view which shows the modification 5 of a partition wall.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Lip coater type coating apparatus 12 ... Backing roll 14 ... Nozzle head 16 ... Head main body 18 ... Doctor edge 22 ... Lid body 24 ... Liquid outlet 26 ... 1st liquid reservoir chamber 28 ... Outflow Channel 30 ... Liquid reservoir wall 32 ... Second liquid reservoir chamber 34 ... Side wall 42 ... Partition wall 44 ... Partition chamber 50 ... Partition wall body 52 ... Proximity

Claims (6)

A nozzle head having a doctor edge is arranged below the backing roll, and a plurality of types of coating liquid are sprayed from the nozzle head under pressure, and the lower peripheral surface of the backing roll is moved from the front to the rear of the nozzle head. A lip coater type coating apparatus that coats the plurality of types of coating liquids with a predetermined coating width in the width direction of the traveling web,
A doctor edge protrudes from the upper surface of the nozzle head,
In the width direction inside the nozzle head, at least two first liquid reservoirs are provided,
Different types of coating liquids are supplied to adjacent first liquid reservoirs among the plurality of first liquid reservoirs,
On the upper surface of the nozzle head located in front of the doctor edge, a liquid outlet for the coating liquid from each first liquid reservoir chamber is provided,
A liquid reservoir wall is erected at the front of the nozzle head, leaving a gap for web travel toward the lower peripheral surface of the backing roll,
A pair of side walls are arranged on both sides between the nozzle head and the backing roll,
A second liquid reservoir chamber is formed which is closed by the pair of side walls, the lower peripheral surface of the backing roll, the liquid reservoir wall, the doctor edge and the upper surface of the nozzle head;
At least one partition wall that partitions the adjacent liquid outlets is disposed in the second liquid reservoir chamber corresponding to the coating width, so that the second liquid reservoir chamber is partitioned into at least two compartments. And, between the front end portion of the partition wall and the blade edge of the doctor edge, a mixing space in which the adjacent coating liquid is mixed is formed,
The volume of each of the compartments gradually decreases as it approaches the blade edge of the doctor edge, and each of the closed compartments is maintained at a pressure higher than atmospheric pressure. In a state where the front part of the partition wall covers the doctor edge, the distance between the front end part of the partition wall and the blade edge of the doctor edge is increased to increase the mixing space. The lip coater type coating apparatus according to claim 1, wherein the size of the overlapping portion in the width direction is widened. The lip coater type coating apparatus according to claim 1, wherein a front portion of the partition wall is formed with a proximity portion that allows different types of coating liquids accumulated in adjacent compartments to approach each other. The lip coater type coating apparatus according to claim 3, wherein the proximity portion of the partition wall becomes thinner toward the front. A pressure gauge for measuring the internal pressure is provided for each compartment to which at least one type of coating liquid is sent,
The lip coater type coating according to claim 1, further comprising a control means for controlling the amount of coating liquid supplied to each compartment so that the pressure measured by each pressure gauge becomes a constant pressure. apparatus. The volume of each first liquid reservoir chamber is changed corresponding to each coating width,
The volume of the first liquid reservoir chamber corresponding to the coating width H1 is larger than the volume of the first liquid reservoir chamber corresponding to the coating width H2 (where H1> H2). Item 1. A lip coater type coating apparatus according to item 1.

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