Rolle aus durchgehendem Netz aus optischen Filmlaminat und Herstellungsverfahren dafür

Details

Veröffentlichungs-Nr.

EP2425966

Aktenzeichen

EP11179963

Anmeldetag

2. September 2011

Veröffentlichung

7. Mai 2014

Erteilung

7. Mai 2014

Rechtsraum

EP

IPC

B32B7/00G02B5/30

Abstract

A method of producing a roll of a continuous web of an optical film laminate, usable in a process of laminating an optical film sheet including a polarizing film and formed to a size corresponding to that an optical panel to a surface of the optical panel being fed to a lamination position, is disclosed. The polarizing film is prepared by subjecting a laminate comprising a thermoplastic resin substrate and a PVA type resin layer formed on the substrate, to uniaxial 2-stage stretching to reduce a thickness of the PVA type resin layer to 10 µm or less, and causing a dichroic material to be absorbed in the PVA type resin layer. A carrier film is releasably attached to the continuous web of optical film laminate including the polarizing film, through an adhesive layer. A defect inspection is performed for the optical film laminate and the adhesive layer. When a defect is detected therein, defect information about a position of the detected defect is recorded. A plurality of slits are formed in the carrier film-attached optical film laminate in a width direction thereof at lengthwise given intervals corresponding to one of dimensions of the optical panel, to extend from a surface of the optical film laminate to a depth reaching a surface of the carrier film to thereby form an optical film laminate sheet between adjacent two of the slits, so that the carrier film-attached optical film laminate is formed as a continuous long sheet laminate in which a plurality of the sheets are continuously supported on the carrier film. When it is determined based on the defect information that the optical film laminate sheets include the defect, an identification for identifying one of the sheets including the defect as a defective sheet is provided to the sheet including the defect. The continuous long sheet laminate is wound into a roll.

Anmelder

Firma

Nitto Denko Corporation

Land

🇯🇵 Japan

Fachgebiete