JP4673261B2 - Coating equipment - Google Patents

Description

  The present invention relates to a coating apparatus that uniformly coats a coating liquid on a substrate surface with a slit die to form a thin film.

  Conventionally, in order to stably hold the coating bead, a coating apparatus provided with a decompression chamber on the upstream side in the base material flow direction has been proposed, and in order to increase the degree of decompression, the decompression extended in the base material traveling direction. It has been proposed to provide a chamber (see Patent Document 1).

  In this case, it is difficult to adopt a configuration in which the nozzle tip is as close as possible to the discharge port in order to enhance the pressure reduction effect.

  In addition, it is necessary to provide a certain degree of decompression chamber in order to generate a uniform pulling pressure, which not only increases the size of the coating apparatus as a whole, but also impairs maintainability and operability.

  As a solution to these problems, there has been proposed a coating apparatus in which a decompression slit is formed on the upstream side and a coating liquid discharge slit is formed on the downstream side in order to stably hold the bead (patent) Reference 2).

Specifically, a combination of at least two blocks, an upstream block and a downstream block, includes a manifold for uniformly discharging the coating liquid in the width direction and a slit die that forms a slit-shaped land portion. At least one plate lip is sandwiched between at least two shim plates arranged in the slit die, and sandwiched between the upstream and downstream blocks from both sides, and these are in close contact with each other, thereby reducing the pressure upstream. A slit for coating liquid discharge is formed on the downstream side.
Japanese Patent Laid-Open No. 1-213641 JP 2005-270704 A

  When the coating apparatus described in Patent Document 2 is adopted, it is possible to achieve downsizing, maintainability, and improved operability as a whole.

  However, when the coating liquid discharge slit is lengthened corresponding to the recent widening of the base material, the decompression slit must be lengthened as well, and as a result, uniform over the entire range of the decompression slit. There is a problem that the decompression effect cannot be achieved.

  Moreover, even if it is necessary to adjust the pressure reduction effect according to the type of coating liquid, there is a problem that the pressure reduction effect cannot be easily adjusted.

  The present invention has been made in view of the above problems, and can achieve overall size reduction, maintainability, and improvement in operability, and the entire range in a direction parallel to the coating liquid discharge slit. An object of the present invention is to provide a coating apparatus that can achieve a uniform decompression effect over a wide range and can easily achieve the adjustment of the decompression effect.

The coating apparatus according to claim 1 includes a slit die disposed opposite to the backup roll, and the coating liquid discharged from the slit die is applied to the surface of the substrate transported on the backup roll. The slit die is formed on the upstream side in the flow direction of the base material from the main body block on which the coating manifold and the coating liquid coating slit are formed, and the coating liquid discharge slit. A recess, a suction hole that communicates with the recess, and an adjustment block that is mounted in the recess so as to be position-adjustable; a part of the recess that faces the backup roll; and the adjustment block in the decompression chamber is formed, characterized by rectifying chamber is configured the sides of the adjusting block and the backup roll and a portion of the recess on the opposite side the adjusting blocks.

The coating apparatus of Claim 2 accommodates the rectification | straightening member in the inside of the said rectification | straightening chamber.

The coating apparatus of claim 1 can achieve an overall reduction in size, improvement in maintainability and operability, and achieves a uniform pressure reduction effect over the entire range in a direction parallel to the coating liquid discharge slit. it can be, it is possible to easily configure the decompression chamber, exhibits a unique effect that Ru can be accomplished simply adjust the vacuum effect.

The coating apparatus according to claim 2 has a specific effect that a more uniform decompression effect can be achieved.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of a coating apparatus of the present invention will be described in detail with reference to the accompanying drawings.

  FIG. 1 is a schematic longitudinal side view showing an embodiment of the coating apparatus of the present invention, FIG. 2 is a front view thereof, and FIG. 3 is an enlarged view showing a portion surrounded by a two-dot chain line in FIG.

  This coating apparatus 1 has a slit die 3 disposed opposite to a backup roll 2, and a coating liquid discharged from the slit die 3 is transported on the backup roll 2 in a state where a coating bead is formed. It is applied to the surface of the material (sheet base material to be coated).

  The slit die 3 includes a main body block 31 in which a coating manifold 32 and a coating liquid discharge slit 33 are formed, and a recess 34 formed upstream of the coating liquid discharge slit 33 in the flow direction of the substrate. And a suction hole 35 communicated with the recess 34 and an adjustment block 36 mounted in the recess 34 so as to be position-adjustable.

  Therefore, by attaching the adjustment block 36, a part of the recess 34 (a part facing the backup roll 2) is formed in the decompression chamber 37, and another part of the recess 34 (the adjustment block 36 is sandwiched). The portion opposite to the backup roll 2) is formed in the rectifying chamber 38. The rectifying chamber 38 preferably accommodates a rectifying member 39 such as a foam or a metal mesh.

  The size, number and interval of the suction holes 35 can be set as appropriate.

  The interval between the coating liquid discharge slit 33 and the decompression chamber 37 is preferably set to an optimal value in the range of 1 to 50 mm, for example, in consideration of the type of coating liquid and the coating thickness.

  Furthermore, the opening thickness (size in the flow direction of the base material) of the decompression chamber 37 is set to an optimum value in consideration of, for example, the type of coating liquid and the coating thickness in the range of 1 to 20 mm. The depth of the decompression chamber 37 is preferably set to an optimum value in the range of 1 to 100 mm, for example, in consideration of the type of coating liquid and the coating thickness.

  If the coating apparatus having the above configuration is employed, a coating film having a desired thickness can be formed on the surface of the substrate as follows.

  The base material is conveyed by the rotation of the backup roll 2. Further, the slit die 3 is brought close to the backup roll 2 so that the gap between the front end surface of the slit die 3 and the substrate surface becomes a predetermined set value within a range of 10 μm to 1 mm, for example.

  Further, the coating liquid fed to the coating manifold 32 is uniformly expanded in the width direction because the flow path from the coating manifold 32 to the coating liquid discharge slit 33 is a reduction path.

  The uniformly spread coating liquid is discharged through the coating liquid discharge slit 33 and applied to the substrate while forming a coating bead.

  After the coating liquid feeding amount is stabilized, the decompression chamber 37 is decompressed. Therefore, the air flow is in the order of the upstream portion of the coating bead, the decompression chamber 37, the rectification chamber 38, and the suction hole 35. Further, the uniformity in the width direction of the strength of the degree of decompression is achieved by the rectifying chamber 38 (preferably, the rectifying chamber 38 in which the rectifying member 39 is accommodated).

  And, since the decompression chamber 37 is arranged immediately upstream of the coating liquid discharge slit 33, it is made uniform in the coating width direction in the vicinity of the coating bead without requiring a seal structure for preventing a reduction in the degree of decompression. A high vacuum can be applied. As a result, the coating bead can be stably maintained in a desired form, and an extremely thin film can be applied uniformly.

  Further, by changing the relative position of the adjustment block 36 with respect to the main body block 31, the size of the decompression chamber 37 can be changed, and thus the decompression effect can be changed.

  Furthermore, when the coating operation is not performed, dust can be sucked by the decompression chamber 37.

It is a schematic longitudinal side view which shows one Embodiment of the coating device of this invention. It is a front view same as the above. It is an enlarged view which shows the part enclosed with the dashed-two dotted line of FIG.

Explanation of symbols

3 Slit Die 33 Coating Liquid Discharge Slit 36 Adjustment Block 37 Decompression Chamber 38 Rectification Chamber 39 Rectification Member

Claims (2)

Having a slit die placed opposite the backup roll,
The coating liquid discharged from the slit die is a coating device that is coated on the surface of a substrate conveyed on a backup roll,
The slit die is a main body block formed with a coating manifold and a coating liquid coating slit,
A recess formed on the upstream side in the flow direction of the base material from the coating liquid discharge slit;
A suction hole communicating with the recess;
An adjustment block mounted in the recess so as to be position-adjustable;
A decompression chamber is constituted by a part of the recess facing the backup roll and the adjustment block,
A coating apparatus , wherein a rectifying chamber is constituted by a part of the recess opposite to the backup roll and the adjustment block across the adjustment block . The coating apparatus according to claim 1, wherein the rectifying chamber contains a rectifying member therein.

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