JP4639705B2 - Depressurized web tension die coater - Google Patents

Description

  The present invention relates to a web tension die coater that applies to a web-like substrate stretched between rolls with a predetermined tension, and in particular, the upstream side is depressurized to prevent air from being embraced by the application. The present invention relates to a vacuum type web tension die coating apparatus.

  Conventionally, as a method of coating a coating liquid on a web-like object to be coated with a slot die head, there is a web tension method for applying to a web-like object to be stretched with a tension set between rolls. is there. In this system, since there is a web-like object to be hollow, it is impossible to install a decompression device upstream of the head to prevent the occurrence of defects such as uneven stripes due to air entrapped in the coating. There was a problem of being close.

  The present invention solves the problems of the prior art, and the problem is that the web tension applied to a web-like substrate stretched with a predetermined tension between the upstream roll and the downstream roll. An object of the present invention is to provide a pressure-reducing web tension die coating apparatus which can apply a high speed coating by preventing the defects caused by the air embraced by the coating, particularly by reducing the pressure on the upstream side.

In order to achieve the above object in the present invention, first, in the invention of claim 1, on a web-like substrate that runs with a predetermined tension between an upstream guide roll and a downstream guide roll. In a web tension die coating apparatus for applying a coating liquid discharged from the slit tip of the slot die head ,
Wherein the upstream guide roll and the slot die head on the substrate between the distal slit, air injection device having a nozzle for ejecting air in the direction against the traveling direction of the substrate is disposed,
Side guides are provided on both side surfaces of the air ejection device in order to prevent the outside air from flowing into the decompression area surrounded by the slot die head, the air ejection device, and the web-like base material. This is a reduced-pressure web tension die coater.

  According to a second aspect of the present invention, the nozzle for ejecting the air has an air flow rate adjusting means. The reduced pressure web tension die coating apparatus according to the first aspect.

  Furthermore, according to a third aspect of the present invention, there is provided a pressure-reducing web tension die coat according to any one of the first or second aspect, wherein a neutralizing bar is disposed upstream of the nozzle for ejecting the air. It is a device.

  Since this invention is the above structure, there exist the following effects.

In other words, according to the first aspect of the present invention, the discharge is made from the slit tip of the slot die head onto the web-like substrate that runs with a predetermined tension between the upstream guide roll and the downstream guide roll. In a web tension die coating apparatus for applying a coating liquid to be applied ,
By disposing an air ejection device having a nozzle for ejecting air in a direction opposite to the traveling direction of the base material on the base material between the upstream guide roll and the slit tip of the slot die head, By sucking out and reducing the pressure of the air to be applied from the head, it is possible to provide a reduced pressure web tension die coater which can prevent defects caused by the air and can be applied at high speed.

  In addition, a reduced pressure web tension die coating device is provided with a nozzle that blows air in a direction opposite to the traveling direction of the traveling substrate, and also removes foreign matter remaining on the substrate by blowing air to the substrate through this nozzle. It can be.

  According to the second aspect of the present invention, it is possible to provide a decompression type web tension die coating apparatus capable of adjusting the degree of decompression by providing an air flow rate adjusting means to the nozzle that ejects the air.

  Furthermore, according to the invention according to the third aspect, by disposing a static elimination bar in the upstream portion of the nozzle that ejects air, the static electricity of the base material in the upstream portion is removed, and the nozzle that ejects air is used. It can be set as the pressure reduction type | formula web tension die-coating apparatus which improves the capability of removing the foreign material which remains on a base material.

  The best mode for carrying out the present invention will be described below in detail with reference to the drawings.

  In the present invention, for example, as shown in a side sectional view of FIG. 1, a slot die head is formed on a web-like object 7 stretched with a predetermined tension between an upstream guide roll 2a and a downstream guide roll 2b. More specifically, the present invention relates to a web tension die coater that discharges and applies a coating liquid from the tip of a slit 1a. More specifically, an air ejection device 3 is provided upstream of the slot die head 1 between the slot die head 1 and the upstream guide roll 2a. The pressure-reducing web tension die coater is provided so as to be in contact with the air jetting device 3 and is provided with a pressure-reducing area 5 between the air jetting device 3 and the traveling web-like object 7.

  Therefore, in the invention according to claim 1, for example, as shown in FIG. 1, an air ejection device 3 having a nozzle 3 a that ejects air in a direction opposite to the traveling direction of the article 7 is disposed. This is a reduced-pressure web tension die coating apparatus.

  In this way, by providing the nozzle 3a for jetting air in the direction opposite to the traveling web-shaped object 7, the air discharged from the slit 1a of the head 1 due to the air flow rate, that is, the air in the decompression area 5 is sucked out. Depressurized web tension die coating which improves the pressure reduction and prevents coating defects due to the air, and further removes foreign matter remaining on the coated object 7 by the air blown to the web-shaped coated object 7 by the nozzle 3a. It is a device.

  Moreover, as shown in FIG. 1, the side guide 4 for preventing the flow of outside air into the decompression area 5 is provided on both side surfaces of the air ejection device 3, and the decompression effect in the decompression area 5 can be improved. .

  In the invention according to claim 2, for example, as shown in FIG. 1, the nozzle 3 a of the air ejection device 3 is provided with an air flow rate adjusting means, thereby sucking out the air in the application portion by the air flow rate. The pressure-reducing web tension die coater can be adjusted to adjust the degree of pressure reduction.

  Furthermore, in the invention according to claim 3, for example, as shown in FIG. 1, there is provided a pressure-reducing web tension die coater in which a static elimination bar unit 6 is disposed upstream of the air ejection device 3. By disposing the unit 6, static electricity of the upstream object 7 is removed, and the ability to remove foreign matters remaining on the object 7 with the air ejected from the nozzle 3 a of the air ejection device 3 is improved. be able to.

It is explanatory drawing which represented one Embodiment of the pressure reduction type | formula web tension die-coating apparatus of this invention with the side cross section.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Slot die head 2a ... Downstream side guide roll 2b ... Upstream side guide roll 3 ... Air ejection device 3a ... Air ejection device nozzle 4 ... Side guide 5 ... Pressure reduction area 6 ... Static elimination bar unit 7 ………… Coating object

Claims (3)

In a web tension die coating apparatus for applying a coating liquid discharged from the slit tip of a slot die head on a web-like substrate that is stretched with a predetermined tension between an upstream guide roll and a downstream guide roll ,
Wherein the upstream guide roll and the slot die head on the substrate between the distal slit, air injection device having a nozzle for ejecting air in the direction against the traveling direction of the substrate is disposed,
Side guides are provided on both side surfaces of the air ejection device in order to prevent the outside air from flowing into the decompression area surrounded by the slot die head, the air ejection device, and the web-like base material. Depressurized web tension die coater.   2. The reduced pressure web tension die coating apparatus according to claim 1, wherein the nozzle for ejecting air has air flow rate adjusting means. The reduced pressure web tension die coater according to any one of claims 1 to 2, wherein a static elimination bar is disposed upstream of the nozzle that ejects the air.

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