Slot die coating apparatus

Patent metadata

Field	Value
Publication number	US-9682395-B2
Application number	US-201414432106-A
Country	US
Kind code	B2
Filing date	Feb 28, 2014
Priority date	Feb 28, 2013
Publication date	Jun 20, 2017
Grant date	Jun 20, 2017

Abstract

The present application relates to a slot die coating apparatus and, more particularly, to a slot die coating apparatus which can ensure the coating stability of a substrate film by reducing pressure oscillations within a vacuum chamber when slot die coating is carried out. The slot die coating apparatus according to the present application can effectively dampen pressure oscillations within a vacuum chamber by connecting a pressure oscillation reducing tank to the vacuum chamber and thus can ensure the coating stability of a substrate film, resulting in a reduction in the proportion of defective products.

First claim

The invention claimed is:

1. A slot die coating apparatus comprising:
a slot die configured to supply a coating liquid to a base film;
a vacuum chamber configured to hold a gas volume V 1 and installed at a front end of the slot die and having a gap formed between the vacuum chamber and the base film;
a first pipe connected to a vacuum pump and connected to the vacuum chamber;
a pressure oscillation reducing tank configured to hold a gas volume V 2 ; and
a second pipe connected to the pressure oscillation reducing tank and to the first pipe, or connected to the pressure oscillation reducing tank and to the vacuum chamber;
wherein V 1 ≦V 2 and together the vacuum chamber and the pressure oscillation reducing tank are configured to provide a vacuum environment to the slot die and which satisfies the following Formula 2:
V 1+ V 2≧ A ( P 2− P 1) DW   [Formula 2]

wherein V1 represents a volume (m3) of the vacuum chamber, V2 represents a volume (m3) of the pressure oscillation reducing tank, A is 1 m3/N to 20 m3/N, P1 represents a pressure (N/m2) in the vacuum chamber, P2 represents atmospheric pressure (N/m2), D represents a width (m) of the gap formed at the vacuum chamber, and W represents a horizontal length (m) of a coating layer which is formed after the substrate film is coated.

2. The slot die coating apparatus of claim 1 , further comprising a roll around which the base film is supplied to the slot die.

3. The slot die coating apparatus of claim 1 , wherein the volume of the pressure oscillation reducing tank V 2 is two times or more the volume of the vacuum chamber V 1 .

4. The slot die coating apparatus of claim 1 , wherein the volume of the pressure oscillation reducing tank V 2 is 10 times or more the volume of the vacuum chamber V 1 .

5. The slot die coating apparatus of claim 1 , wherein the volume of the pressure oscillation reducing tank V 2 is 20 times or more the volume of the vacuum chamber V 1 .

Assignees

• Lg Chemical Ltd

Inventors

• Park Won Chan
• Yeo Jung Hyun
• Im Ye Hoon

Classifications

• B05C5/005

  Curtain coaters (B05C5/008 takes precedence) · CPC title

• B05C11/10

  Storage, supply or control of liquid or other fluent material; Recovery of excess liquid or other fluent material {(B05C1/0813, B05C5/0225, B05C17/002 and B05C19/06 take precedence)} · CPC title

• B05C5/008

  Slide-hopper curtain coaters · CPC title

• B05C5/0245

  for applying liquid or other fluent material to a moving work of indefinite length, e.g. to a moving web (B05C5/0241, B05C5/0254, B05C5/027, B05C5/0283 take precedence) · CPC title

• B05C11/02

  Apparatus for spreading or distributing liquids or other fluent materials already applied to a surface {; Controlling means therefor}(B05C7/00 takes precedence; Hand tools for such purposes B05C17/10); Control of the thickness of a coating {by spreading or distributing liquids or other fluent materials already applied to the coated surface}(controlling supply of liquid or other fluent material B05C11/10) · CPC title