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Curtain coating apparatus and curtain coating method

A technology of curtain coating and coating liquid, which is applied to the device, coating, optics and other directions of coating liquid on the surface, which can solve the insufficient acceleration of curtain film, uneven curtain film, and damage to the uniformity of coating film And other issues

Inactive Publication Date: 2011-04-13
RICOH KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0032] However, this technique suffers from the problem that the acceleration of the curtain film by the edge guide auxiliary fluid is insufficient, so that the formation of the boundary layer cannot be eradicated
[0034] However, this technique has a problem that when the static surface tension of the coating liquid is as small as about 35 mN / m, the curtain film deviates from the apex of the protruding portion and adheres to the side surface of the edge rail due to disturbance caused by wind, thereby Causes uneven curtain film
Also, this technique has another problem that when the coating liquid falls nonlinearly, the uniformity of the coating film is impaired, and coating unevenness occurs
[0037] However, this technique involves a structure in which the edge guide auxiliary water flows directly into the ejection port, and thus there is a problem that it is difficult to spray the edge guide auxiliary water uniformly, and another problem is that since the edge guide auxiliary water flows downward the surface is Flat surface, so the auxiliary fluid does not fall linearly, thus creating an unstable curtain membrane, and another problem is that the curtain membrane does not shake due to disturbance caused by wind

Method used

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  • Curtain coating apparatus and curtain coating method
  • Curtain coating apparatus and curtain coating method
  • Curtain coating apparatus and curtain coating method

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Experimental program
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no. 1 approach

[0115] (Curtain Coating Apparatus and Curtain Coating Method)

[0116] The curtain coating apparatus of the present invention includes: a pair of edge rails configured to support both side edges of at least one coating liquid so as to form a free-falling coating liquid film and apply the coating liquid film to a continuous running carrier; and auxiliary water inlet. If necessary, the curtain coating apparatus may further include appropriately selected other unit(s).

[0117] The curtain coating method of the present invention comprises the steps of: supporting both side edges of at least one coating liquid with a pair of edge guide rails so as to form a free-falling coating liquid film and applying the coating liquid film to on a carrier for continuous operation; and introduction of auxiliary water. The curtain coating method may further include appropriately selected other step(s), if necessary.

[0118]

[0119] The auxiliary water introduction port makes the auxiliary ...

Embodiment A-1

[0277]

[0278] ●Coating device: the device is shown in figure 2 middle.

[0279] ●Curtain drop width: 250mm

[0280] The position of the edge guides can be moved back and forth in the direction of substrate travel. The shade drop position is adjusted so that the shade drops at the center of the edge guide auxiliary water flow-down surface in the width direction.

[0281] Coating liquid: acrylic emulsion adhesive with a liquid viscosity of 750mPa·s (B-type viscometer), a liquid surface tension of 33mN / m (static surface tension in the platinum plate method) and a flow rate of 1.25cc / cm sec.

[0282] ●Auxiliary water on the edge guide rail: the introduction rate is 0.40m / sec (the width of the auxiliary water flowing down the surface of each 6.5mm edge guide rail is 100cc / min), and the gap size of the auxiliary water inlet is 0.35mm.

[0283] • Presence or absence of deformation of the curtain membrane caused by the teapot effect at the edge guides.

[0284] • Presence o...

Embodiment A-2

[0319] Embodiment A-2 is the same as Embodiment A-1, except that the length of R is changed from 5 mm to 3 mm.

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Abstract

The invention relates to a curtain coating apparatus and a curtain coating method. The curtain coating apparatus including: a pair of edge guides configured to support both side edges of at least one coating liquid so as to form a coating liquid film which falls freely and apply the coating liquid film onto a continuously running support; and an auxiliary water introduction port which allows auxiliary water to be introduced substantially uniformly with respect to a width direction of an edge guide auxiliary water flow-down surface of each edge guide from an upper portion toward a lower portion of the flow-down surface, wherein the flow-down surface has at its upper portion a flat surface portion, and wherein the flow-down surface has at its lower portion an arc-shaped portion which is provided at a center and which protrudes in the shape of an arc, and a flat surface portion which is provided on both sides of the arc-shaped portion.

Description

technical field [0001] The invention relates to a curtain coating device and a curtain coating method, wherein at least one layer of coating liquid is sprayed from a slit, and the sprayed coating liquid falls freely through a pair of curtain edge guide rails, and the curtain edge The guide rail guides the coating liquid in the form of a curtain, so that the coating liquid is applied to the continuously running carrier. Background technique [0002] Conventionally, a curtain coating method has been proposed as a coating method for producing photosensitive materials such as films. [0003] Examples of curtain coating methods include: (i) a method in which a coating liquid is sprayed from a nozzle slit, and the coating liquid is passed through a pair of curtain edge rails which guide the coating liquid in the form of a curtain. The cloth liquid falls freely and collides with a continuously running carrier (hereinafter, the term "carrier" is also referred to as "web" or "substr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B05C5/00B05C11/10B05D1/02
CPCG03C1/74G03C2001/747Y10S118/04
Inventor 杣田浩纪山本一公原哲也
Owner RICOH KK