Method for producing functional film, control device, and control method

Patent metadata

Field	Value
Publication number	US-2017113247-A1
Application number	US-201615297686-A
Country	US
Kind code	A1
Filing date	Oct 19, 2016
Priority date	Oct 23, 2015
Publication date	Apr 27, 2017
Grant date	—

Abstract

A coating amount is adjusted based on a result of the inspecting step, then the coating amount is not adjusted during a standby period (Wt) which is a time taken to transfer the film from a coating section ( 21 ) to an inspecting section ( 26 ), and then the coating amount is adjusted based on the result of the inspecting step after the standby period has elapsed. With the configuration, an amount of a coating layer on a film base material is stabilized.

First claim

1 . A method for producing a functional film comprising:
coating step of coating a film base material with a coating material in a coating section; processing step of processing an applied coating material in a processing section; and inspecting step of inspecting a film obtained by the coating step in an inspecting section, wherein a coating amount is adjusted based on a result of the inspecting step, then the coating amount is not adjusted during a standby period which is a time taken to transfer the film from the coating section to the inspecting section, and then the coating amount is adjusted based on a result of the inspecting step after the standby period has elapsed.

2 . The method as set forth in claim 1 , wherein:
in the inspecting step, a physical quantity is measured for obtaining an amount of the coating material on the film base material before the processing step or for obtaining an amount of a coating layer on the film base material after the processing step.

3 . The method as set forth in claim 2 , wherein:
in a case where the physical quantity which has been measured crosses a threshold, the coating amount is adjusted.

4 . The method as set forth in claim 3 , wherein:
in a case where a difference between the physical quantity which has been measured and a criterion value of the physical quantity is greater than a tolerance, the coating amount is changed by an adjustment value that is obtained by dividing the difference by a ratio of a change in physical quantity relative to a change in coating amount.

5 . The method as set forth in claim 4 , wherein:
in a case where the adjustment value is greater than a predetermined value, the coating amount is changed by the predetermined value.

6 . The method as set forth claim 2 , wherein:
the physical quantity is a weight per unit area or a thickness of the film; or the physical quantity is a weight per unit area or a thickness of a part of the film excluding the film base material.

7 . The method as set forth in claim 1 , wherein:
the inspecting step is carried out after the processing step.

8 . The method as set forth in claim 1 , wherein:
the processing step includes drying the coating material on the film base material.

9 . The method as set forth in claim 1 , wherein:
the coating step is carried out with a gravure coater method; and the coating amount corresponds to a rotation ratio of a gravure roll.

10 . The method as set forth in claim 1 , wherein:
the coating step is carried out with a bar coater method; and the coating amount corresponds to an amount of a gap between a coating bar and the film.

11 . The method as set forth in claim 1 , wherein:
the coating step is carried out with a die coater method; and the coating amount corresponds to a supplied liquid amount from a nozzle.

12 . The method as set forth in claim 1 , wherein the functional film is a battery separator.

13 . A control device for controlling a production apparatus for producing a functional film, wherein:
the production apparatus includes (i) a coating section for coating a film base material with a coating material, (ii) a processing section for processing the coating material which has been applied, and (iii) an inspecting section for inspecting a film which has been coated; and a coating amount is adjusted based on a result of inspection carried out by the inspecting section, then the coating amount is not adjusted during a standby period which is a time taken to transfer the film from the coating section to the inspecting section, and then the coating amount is adjusted based on the result of inspection carried out by the inspecting section after the standby period has elapsed.

14 . A method for controlling a production apparatus for producing a functional film, wherein:
the production apparatus includes (i) a coating section for coating a film base material with a coating material, (ii) a processing section for processing the coating material which has been applied, and (iii) an inspecting section for inspecting a film which has been coated; and a coating amount is adjusted based on a result of inspection carried out by the inspecting section, then the coating amount is not adjusted during a standby period which is a time taken to transfer the film from the coating section to the inspecting section, and then the coating amount is adjusted based on the result of inspection carried out by the inspecting section after the standby period has elapsed.

Assignees

• Sumitomo Chemical Co

Inventors

• Wang Jian
• Uejima Rikuri

Classifications

• H01M10/052

  Li-accumulators · CPC title

• H01M50/429

  Natural polymers · CPC title

• H01M50/457

  comprising three or more layers · CPC title

• H01M50/423

  Polyamide resins · CPC title

• H01M50/451

  comprising layers of only organic material and layers containing inorganic material · CPC title