System for controlling tension of films and system for manufacturing a polarizing plate comprising the same

Patent metadata

Field	Value
Publication number	US-RE48331-E
Application number	US-201516355428-A
Country	US
Kind code	E1
Filing date	Mar 4, 2015
Priority date	Aug 14, 2014
Publication date	Dec 1, 2020
Grant date	Dec 1, 2020

Abstract

A film tension control system according to an embodiment of the present disclosure includes a delamination unit installed on a transfer path of a polarizing plate to delaminate a release film from a polarizing film, the polarizing plate including the polarizing film and the release film attached to one surface of the polarizing film, an inspection unit installed on a transfer path of the polarizing film to inspect if impurities are present in an adhesive layer formed on one surface of the polarizing film, a tension indication unit installed on a movement path of the release film to indicate a degree of tension applied to the release film, a re-lamination unit to re-laminate the release film having passed through the tension indication unit on the adhesive layer of the polarizing film having passed through the inspection unit, and a tension adjustment unit installed on the transfer path of the re-laminated polarizing plate to adjust the tension of the optical film and the release film.

First claim

What is claimed is:

1. A film tension control system comprising:
a delamination unit installed on a transfer path of a polarizing plate to delaminate a release film from a polarizing film, the polarizing plate comprising the polarizing film and the release film attached to an adhesive layer formed on one surface of the polarizing film;
an inspection unit installed next to the delamination unit on a transfer path of the polarizing film to inspect if impurities are present in the adhesive layer formed on one surface of the polarizing film having passed through the delamination unit;
a tension indication unit installed on a movement path of the release film to indicate a degree of tension applied to the release film;
a re-lamination unit to re-laminate the release film having passed through the tension indication unit on the adhesive layer of the polarizing film having passed through the inspection unit; and
a tension adjustment unit installed next to the re-lamination unit on a transfer path of the re-laminated polarizing plate to adjust the tension of the optical polarizing film and the release film.

2. The film tension control system according to claim 1 , wherein the film tension control system comprises a plurality of guide rollers installed on the transfer paths of the polarizing film, the release film, and the polarizing plate to guide the transfer of each element.

3. The film tension control system according to claim 1 , wherein the delamination unit comprises a pair of rollers disposed at opposite sides with the polarizing plate sandwich between.

4. The film tension control system according to claim 3 , wherein one of the pair of rollers coming into contact with the release film adsorbs the release film to delaminate the release film from the polarizing film.

5. The film tension control system according to claim 1 , wherein the inspection unit comprises a light source and a vision camera disposed at opposite sides with the polarizing film sandwiched between, and a cross filter disposed between the light source and the vision camera.

6. The film tension control system according to claim 1 , wherein the tension indication unit is a dancer roller installed to move up when the tension of the release film increases and to move down when the tension of the release film reduces.

7. The film tension control system according to claim 1 , wherein the re-lamination unit is implemented in a form of a pair of rollers disposed at opposite sides with the polarizing film and the release film sandwiched between.

8. The film tension control system according to claim 1 , wherein the tension adjustment unit comprises:
an action roller to guide the transfer of the re-laminated polarizing plate; and
an actuator connected to the action roller to move up and down the action roller.

9. The film tension control system according to claim 1 , wherein the film tension control system enables interoperation of the indication unit and the tension adjustment unit.

10. A system for manufacturing a polarizing film, comprising a film tension control system according to claim 1 .

11. A system for manufacturing a polarizing film, comprising a film tension control system according to claim 2 .

12. A system for manufacturing a polarizing film, comprising a film tension control system according to claim 3 .

13. A system for manufacturing a polarizing film, comprising a film tension control system according to claim 4 .

14. A system for manufacturing a polarizing film, comprising a film tension control system according to claim 5 .

15. A system for manufacturing a polarizing film, comprising a film tension control system according to claim 6 .

16. A system for manufacturing a polarizing film, comprising a film tension control system according to claim 7 .

17. A system for manufacturing a polarizing film, comprising a film tension control system according to claim 8 .

18. A system for manufacturing a polarizing film, comprising a film tension control system according to claim 9 .

19. A method of manufacturing a polarizing plate, the method comprises:
providing a polarizing plate comprising a polarizing film laminated with a release film using a pressure sensitive adhesive layer, delaminating the release film from the pressure sensitive adhesive layer on the polarizing film by a delamination unit installed on a transfer path of the polarizing plate, inspecting the pressure sensitive adhesive layer disposed on the polarizing film having passed through the delamination unit for impurities by an inspection unit installed next to the delamination unit on a transfer path of the polarizing film, indicating a degree of tension applied to the release film by using a tension indication unit installed on a movement path of the release film, re-laminating the release film having passed through the tension indication unit on the pressure sensitive adhesive layer on the polarizing film having passed through the inspection unit by a re-lamination unit to form a re-laminated polarizing plate, adjusting the tension of the multilayered polarizing film and the release film by a tension adjustment unit installed next to the re-lamination unit on a transfer path of the re-laminated polarizing plate, cutting the polarizing plate, and conveying the polarizing plate cut to outside a processing line.

20. A method of inspecting a polarizing plate, the method comprises:
providing a polarizing plate comprising a polarizing film laminated with a release film using a pressure sensitive adhesive layer, delaminating the release film from the pressure sensitive adhesive layer on the polarizing film by a delamination unit installed on a transfer path of the polarizing plate, inspecting the pressure sensitive adhesive layer disposed on the polarizing film having passed through the delamination unit for impurities by an inspection unit installed next to the delamination unit on a transfer path of the polarizing film, indicating a degree of tension applied to the release film by using a tension indication unit installed on a movement path of the release film, re-laminating the release film having passed through the tension indication unit on the pressure sensitive adhesive layer on the polarizing film having passed through the inspection unit by a re-lamination unit to form a re-laminated polarizing plate, and adjusting the tension of the multilayered polarizing film and the release film by a tension adjustment unit installed next to the re-lamination unit on a transfer path of the re-laminated polarizing plate.

Assignees

• Lg Chemical Ltd

Inventors

• Kim Eun-Je
• Jang Eung-Jin
• Shin Jae-Ok
• Kim Youn-Su
• Kim Tae-Sick
• Park Jung-Kyu
• Bang Young-Sun
• Ha Eui-Bong
• Hwang Dong-Ki
• Yoon Jung-Sik

Classifications

• B29C55/02

  of plates or sheets · CPC title

• G02B5/3033 Primary

  in the form of a thin sheet or foil, e.g. Polaroid · CPC title

• G02B5/30

  Polarising elements (light-modulating devices with active elements G02F1/00) · CPC title

• B29C55/06

  parallel with the direction of feed · CPC title

• G02B1/14

  Protective coatings, e.g. hard coatings · CPC title