JP4802073B2 - Lip coater type coating equipment - Google Patents

Description

  The present applicant has proposed a lip coater type coating apparatus in which a nozzle head having a doctor edge is disposed below a backup roll and the coating liquid is sprayed from the nozzle head under pressure to be applied to the web. (For example, refer to Patent Document 1).

This lip coater type coating apparatus is provided with a first liquid reservoir chamber in the width direction inside the nozzle head, and an outflow passage extending from the first liquid reservoir chamber to the front of the doctor edge is provided inside the nozzle head. A liquid reservoir wall was erected from the head to the lower peripheral surface of the backup roll, leaving a web running gap, and a second liquid reservoir chamber was formed from the lower peripheral surface of the backup roll, the liquid reservoir wall, and the front surface of the doctor edge. Is.
Japanese Patent Laid-Open No. 2-172555

  In the lip coater type coating apparatus as described above, when cleaning the first liquid reservoir or replacing the coating liquid in the first liquid reservoir, the nozzle head is disassembled and cleaned. . For this reason, the remaining coating liquid overflows when the nozzle head is disassembled, contaminating the surroundings, and the nozzle head is cleaned while it is attached to the machine. There was a problem.

  In view of the above problems, the present invention provides a lip coater type coating apparatus capable of easily cleaning the first liquid reservoir chamber.

The present invention provides a lip coater type coating in which a nozzle head having a doctor edge is disposed below a backup roll in which a web runs in the front-rear direction, and a coating liquid is sprayed from the nozzle head under pressure to be applied to the web. In the construction apparatus, a first liquid reservoir chamber provided in the width direction inside the nozzle head, an outflow passage extending from the first liquid reservoir chamber to the front of the doctor edge, and the backup roll from the front of the nozzle head A reservoir wall erected on the lower peripheral surface leaving a gap between the webs; both side walls respectively disposed between both side portions of the nozzle head and the lower peripheral surface of the backup roll; and A second liquid reservoir chamber formed by a lower peripheral surface, the liquid reservoir wall, a front portion of the doctor edge and the side walls, and the nozzle head is a head book And has a tank portion, said head body protrudes the doctor edge in the width direction in the upper portion, the tank portion includes the first reservoir chamber therein, and Ri removably der said head body The tank section is composed of a tank body having a recess that forms the first liquid reservoir chamber, and a lid that is detachably attached to the tank body to close the recess. It is a lip coater type coating device.

  According to the present invention, the tank part is removed from the head body of the nozzle head, and the first liquid reservoir chamber inside the tank part is washed.

(First embodiment)
Hereinafter, the lip coater type coating apparatus 10 of the 1st Embodiment of this invention is demonstrated based on FIGS. 1-4.

  The lip coater type coating apparatus 10 applies a coating solution to a web F such as a film sheet, fabric, metal foil, paper or the like.

(1) Configuration of the lip coater type coating apparatus 10 The above-described web F runs from the front to the back (from right to left in FIG. 1) on the lower peripheral surface of the backup roll 12 rotating at a predetermined rotational speed.

  Below the backup roll 12, a nozzle head 14 for spraying the coating liquid is disposed. The nozzle head 14 has substantially the same width as the backup roll 12 and is composed of a head body 16 and a tank portion 22.

  A doctor edge 18 projects from the upper end of the head body 16. The doctor edge 18 is a comma-type doctor edge 18 formed in a longitudinal arc shape. The web F travels through the gap between the doctor edge 18 and the backup roll 12. The front surface 16a of the head body 16 is formed in a flat surface.

  The tank portion 22 is detachably attached to the flat front surface 16a of the head body 16 by bolts 23. The tank portion 22 includes a tank body 100 and a plate-like lid body 102 that is detachably attached to the tank body 100 with bolts 25. A recess 24 is formed on the rear surface of the tank body 100 as shown in FIG. The first liquid reservoir chamber 26 is formed by covering the concave portion 24 with the plate-like lid 102 described above. Further, a slit-like outflow passage 28 provided in the width direction continuously to the first liquid reservoir chamber 26 is also formed by covering the tank body 100 with the lid body 102. An outlet 28 a is provided between the front part of the doctor edge 18 and the tip part of the nozzle head 14. In the front surface of the recess 24, that is, the front surface of the first liquid reservoir chamber 26, as shown in FIG.

  A liquid reservoir wall 30 is detachably attached to the upper front end portion of the nozzle head 14, that is, the front upper end portion of the tank body 100 by bolts 31. The liquid storage wall 30 has the same dimensions as the width direction of the nozzle head 14, and a gap for running the web F is left between the upper end of the liquid storage wall 30 and the lower peripheral surface of the backup roll 12. ing.

  As shown in FIG. 3, both side walls 34, 34 are provided between both side portions of the nozzle head 14 and the lower peripheral surface of the backup roll 12. As shown in FIG. 3, the coating width L is determined by the side walls 34.

  The closed space surrounded by the lower peripheral surface of the backup roll 12, the liquid reservoir wall 30, the upper portion of the nozzle head 14, the front surface of the doctor edge 18, and both side walls 34, 34 becomes the second liquid reservoir chamber 32. The internal volume of the second liquid reservoir chamber 32 is larger than the volume of the outflow path 28 because it swells forward from the outlet 28 a of the outflow path 28.

  The head body 16 located below the doctor edge 18 is provided with a slit 36. One end of the slit 36 faces the rear upper surface of the head body 16 in the width direction, and the slit 36 is provided so as to be inclined downward along the width direction and forward. A plurality of adjusting bolts 38 penetrates the slit 36 at equal intervals in the width direction so as to be orthogonal to the slit 36. The end of the adjustment bolt 38 faces the rear surface 16b of the nozzle head 14, and the width of the slit 36 can be adjusted by adjusting the screwing condition of the adjustment bolt 38 from the rear surface 16b. If the width of the slit 36 changes, the blade edge of the doctor edge 18 moves up and down and can be adjusted up and down by a width of 2 μm to 3 μm. Since a plurality of adjustment bolts 38 are provided along the width direction, the adjustment bolt 38 closest to the cutting edge to be moved up and down is adjusted.

  A holding member 40 is provided below the center of the nozzle head 14. This holding member 40 is provided with a double rod type air cylinder 42 in the vertical direction. The air cylinder 42 is screwed to the lower surface of the head body 16 of the nozzle head 14 at the upper end of the cylinder tube.

  A scale holding member 44 is disposed below the inside of the holding member 40. Inside the scale holding member 44, a magnetic displacement measuring scale 45 is disposed. The top of the displacement measuring scale 45 is in contact with the lower end of the piston rod of the air cylinder 42, and the displacement of the piston rod in the vertical direction can be detected. As the air cylinder 42 of the holding member 40 moves up and down, the deflection of the nozzle head 14 can be adjusted up and down by a width of 20 μm to 30 μm, respectively.

  In order to measure the pressure of the coating liquid in the second liquid reservoir chamber 32, a pressure gauge 50 made of a piezoelectric element such as a ceramic sensor is provided on the upper surface of the tank body 100 of the nozzle head 14.

  In order to measure the thickness of the web F, a thickness measuring device 52 is provided on the running path of the web F after coating. The thickness measuring device 52 includes a β-ray thickness meter, an infrared thickness meter, and the like.

(2) Electrical configuration of lip coater type coating apparatus 10 Next, the electrical configuration of the lip coater type coating apparatus 10 will be described with reference to FIG.

  The microcomputer 48 is connected to the pressure gauge 50, the thickness measuring device 52, and the second liquid reservoir chamber 32 described above, and the motor of the pump 46 that pumps the coating liquid from the inlet 20.

(3) Operating state of lip coater type coating apparatus 10 Next, the operating state of the lip coater type coating apparatus 10 having the above-described configuration will be described.

  The thickness of the coating liquid applied to the web F is determined by the gap between the backup roll 12 and the doctor edge 18 and the discharge amount of the pump 46.

  The web F is run in the gap between the backup roll 12 and the doctor edge 18. The coating liquid is diffused from the pump 46 in the first liquid reservoir chamber 26 in the width direction of the nozzle head 14 and is uniformly sprayed from the outlet 28a of the outflow passage 28 into the second liquid reservoir chamber 32, so that the second liquid reservoir chamber is formed. 32 is maintained at a constant pressure (hereinafter referred to as a reference pressure). This reference pressure is set so that the coating liquid fills the second liquid reservoir chamber 32 and does not overflow from the gap between the liquid reservoir wall 30 and the backup roll 12.

  The web F passes through the second liquid reservoir chamber 32 filled with the coating liquid and travels to the doctor edge 18, and the coating liquid is applied by the linear pressure by the blade edge of the doctor edge 18. In this case, since the second liquid reservoir chamber 32 swells forward from the outlet 28a of the outflow passage 28 and is formed larger than the volume of the outflow passage 28, the inside of the second liquid reservoir chamber 32 is set to a reference pressure higher than the atmospheric pressure. Therefore, when the web F is carried into the second liquid reservoir chamber 32 through the gap between the liquid reservoir wall 30 and the backup roll 12, air does not enter the second liquid reservoir chamber 32. Thereby, bubbles are not generated in the coating layer.

  Further, since the doctor edge 18 is a comma type, the volume of the second liquid reservoir chamber 32 gradually decreases as the doctor edge 18 approaches the cutting edge, and the pressure applied to the web F gradually increases accordingly. The coating liquid is prevented from overflowing outside the second liquid reservoir chamber 32 by adjusting the pressure.

  When the internal pressure of the second liquid reservoir chamber 32 rises above the reference pressure due to external factors or the like, the fact that the internal pressure has risen is output to the microcomputer 48 by the pressure signal AS from the pressure gauge 50. The microcomputer 48 widens the gap between the backup roll 12 and the doctor edge 18 by using the vertical movement device (not shown) based on the operation signal GS. When the pressure of the coating liquid is lowered, the internal pressure of the second liquid reservoir chamber 32 is lowered to the original pressure. Conversely, when the internal pressure of the second liquid reservoir chamber 32 falls below the reference pressure, the gap is narrowed and the internal pressure of the second liquid reservoir chamber 32 is increased.

  Thus, even if the internal pressure of the liquid reservoir chamber 32 changes, a constant pressure can always be maintained by feedback control.

(4) Cleaning Method for Tank 22 When the coating liquid is applied to the web F using the lip coater type coating apparatus 10 as described above, the first liquid reservoir chamber 26 and the second liquid reservoir chamber 32 are applied. Need to be cleaned. In particular, when applying different coating liquids, the first liquid reservoir chamber 26 must be washed.

  Therefore, first, the liquid reservoir wall 30 and the side walls 34 are removed.

  Next, the tank portion 22 is removed from the head body 16. In this case, the tank portion 22 can be removed simply by removing the bolt 23. Since the first liquid reservoir chamber 26 of the tank portion 22 is in a tank state surrounded by the tank body 100 and the lid 102, the coating liquid may leak from the first liquid reservoir chamber 26 or the outflow path 28. Absent.

  Next, the doctor edge 18 is washed with the tank portion 22 removed. In this case, since the tank part 22 is removed and the entire surface of the doctor edge 18 is exposed, cleaning is easy.

  Next, in order to remove the plate-like lid 102 from the removed tank portion 22, the bolts 25 are removed and removed. In this case, the tank unit 22 is removed from the lip coater type coating apparatus 10 and taken to a place (for example, a sink) where the coating liquid may leak, and the lid 102 is removed. When the lid 102 is removed, the recess 24 is exposed, so that the outflow path 28 and the wall surface of the recess 24 can be easily cleaned. Similarly, the lid 102 can be easily cleaned.

  After the cleaning as described above, the lid 102 is attached to the tank body 100, and the tank portion 22 is attached to the head body 16 to complete the cleaning operation.

  Thus, since the tank part 22 can be removed from the head body 16 and cleaned, the coating liquid does not leak out and it is difficult to perform the cleaning operation.

(Second Embodiment)
Next, the lip coater type coating apparatus 10 of 2nd Embodiment is demonstrated based on FIG.

  In the first embodiment, the plate-like lid 102 has the same thickness from the upper end to the lower end as shown in FIG. 2, but in this embodiment, the upper portion of the lid 102 as shown in FIG. However, it is in an inclined state that becomes thinner as it goes up. The outflow path 28 is formed by a gap between the inclined portion and the tank body 100, and the outflow path 28 is inclined not to the vertical direction but to the left as it goes up in FIG. An outlet 28a is formed.

  With such a configuration, the outlet 28a can be provided in the vicinity of the front end portion of the doctor edge 18, so that the outflowing coating liquid reaches the front end portion of the doctor edge 18 so that the pressure is more easily applied.

(Third embodiment)
A lip coater type coating apparatus 10 according to a third embodiment of the present invention will be described with reference to FIG.

  In the first embodiment, as shown in FIG. 3B, the lid body 102 has the same width as the tank body 100, i.e., the width direction of the nozzle head 14, and is formed from a single lid body 102. . On the other hand, in the present embodiment, the second liquid reservoir chamber 32 is partitioned by the left partition portion 104 and the right partition portion 106 as shown in FIG. That is, the partition wall 108 is provided in the central portion of the first liquid reservoir chamber 26 and is divided into left and right sections 104 and 106. When coating is performed, the partition piece 110 is also disposed in the second liquid reservoir chamber 32. As a result, the web F can be applied with two coating widths L1 and L2, as shown in FIG.

  And the cover body 102 is comprised with one board as shown in FIG.3 (b) of the magnitude | size corresponding to both right-and-left division part 104,106.

  As a result, when the partitioned first liquid reservoir chamber 26 is washed, the left lid portion 112 and the right lid portion 114 are removed and washed, so that the left compartment portion 104 and the right compartment portion 106 are easily washed. be able to.

  The lid 102 may be divided into a left lid 112 and a right lid 114 so as to correspond to the left and right partition sections 104 and 106 as shown in FIG.

(Fourth embodiment)
In the above embodiment, the first liquid reservoir chamber 26 has a shape in which the left side is a straight line and the right side is a curved line as shown in FIG.

  In this case, the tank unit 22 is not composed of the tank main body 100 and the lid body 102, but both sides of the arc-shaped first liquid reservoir chamber 26 of the tank unit 22 can be freely opened. A brush or the like is inserted toward the right side to clean the inside of the arc-shaped first liquid reservoir chamber 26.

  Further, as an example of this change, the tank portion 22 is not composed of the tank body 100 and the lid body 102, but the tank portion 22 can be divided into a front portion and a rear portion, thereby cleaning the inside of the first liquid reservoir chamber 26. May be.

  The present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the gist thereof.

It is a side view of the lip coater type coating device which shows the 1st Embodiment of this invention. It is a partially expanded longitudinal cross-sectional view of a lip coater type coating apparatus. (A) is the II sectional view taken on the line in FIG. 2, (b) is a front view of a cover body. It is a block diagram of a lip coater type coating apparatus. It is a partially expanded longitudinal cross-sectional view of the lip coater type coating apparatus of 2nd Embodiment. (A) is the longitudinal cross-sectional view seen from the back of the lip coater type coating device of 3rd Embodiment, (b) is a front view of the cover body of the example of a change of 3rd Embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Lip coater type coating apparatus 12 Backup roll 14 Nozzle head 16 Head main body 18 Doctor edge 20 Inflow port 22 Tank part 24 Recessed part 26 1st liquid reservoir room 28 Outflow path 30 Liquid reservoir wall 32 2nd liquid reservoir room 34 Side wall 100 Tank body 102 Lid

Claims (6)

In the lip coater type coating apparatus, a nozzle head having a doctor edge is disposed below a backup roll in which the web runs in the front-rear direction, and a coating liquid is sprayed from the nozzle head under pressure to be applied to the web.
A first liquid reservoir chamber provided in the width direction inside the nozzle head;
An outflow path leading from the first liquid reservoir chamber to the front of the doctor edge;
A reservoir wall erected from the front part of the nozzle head to the lower peripheral surface of the backup roll leaving a gap between the webs;
Both side walls respectively disposed between both side portions of the nozzle head and the lower peripheral surface of the backup roll;
A second liquid reservoir chamber formed by a lower peripheral surface of the backup roll, the liquid reservoir wall, a front portion of the doctor edge, and the side walls;
Have
The nozzle head has a head body and a tank part,
The head body protrudes in the width direction at the doctor edge at the upper end,
The tank portion includes the first reservoir chamber therein, and Ri removably der and the head main body,
The tank portion is composed of a tank body having a recess that forms the first liquid reservoir chamber, and a lid that is detachably attached to the tank body to close the recess.
A lip coater type coating apparatus characterized by that. The lip coater type coating apparatus according to claim 1, wherein the tank portion also includes the outflow path. Lip coater type coating apparatus according to claim 1, wherein the lid is characterized in that it is a plate shape. The upper part of the lid has an inclined part that becomes thinner as it goes up,
The outlet channel, lip coater type coating apparatus according to claim 1, characterized in that it is formed by a gap between the tank body and the inclined portion. A plurality of partition portions are formed in the width direction by one or a plurality of partition walls in the first liquid reservoir chamber,
Lip coater type coating apparatus according to claim 1, characterized in that it has the lid for each of the partition portions. The lip coater type coating apparatus according to claim 1, wherein a cross-sectional shape of the first liquid reservoir chamber is substantially circular.

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