Patent ID: 9442234
Filing Date: 2016-09-13
CPC Classification: B32B,G02B

Claim Text:
1. A method of producing a roll of a laminate strip including a polarizing film, comprising the steps of: forming a continuous web of an optical film laminate including a polarizing film which consists of a polyvinyl alcohol type resin layer and has a thickness of 10 μm or less with an absorption axis in a lengthwise direction of the optical film laminate, the polarizing film being formed by performing an stretching sub-step of subjecting a laminate comprising a continuous web of non-crystallizable thermoplastic resin substrate and a polyvinyl alcohol type resin layer formed on the substrate, to uniaxial stretching in a length direction of the laminate based on 2-stage stretching consisting of preliminary in-air stretching and in-boric-acid-solution stretching, to attain a total stretching ratio of 5 to 8.5 to thereby reduce the thickness of the polyvinyl alcohol type resin layer to 10 μm or less, and an impregnation sub-step of having the polyvinyl alcohol type resin layer impregnated with a dichroic material, cutting the continuous web of optical film laminate along a direction parallel to the lengthwise direction to form at least one continuous web of laminate strip having a given width; and winding the continuous web of laminate strip having the given width into a roll.