METHOD FOR MANUFACTURING POLARIZING FILM AND DEVICE FOR MANUFACTURING POLARIZING FILM

To provide a method capable of continuously and stably manufacturing a polarizing film while suppressing adhesion of the deposit deposited from a process liquid used for wet processing of a polyvinyl alcohol resin film to the polyvinyl alcohol resin film.SOLUTION: There is provided a method for manu...

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Hauptverfasser: TAKEUCHI TOMOYASU, ITO HIDEKI
Format: Patent
Sprache:eng ; jpn
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Zusammenfassung:To provide a method capable of continuously and stably manufacturing a polarizing film while suppressing adhesion of the deposit deposited from a process liquid used for wet processing of a polyvinyl alcohol resin film to the polyvinyl alcohol resin film.SOLUTION: There is provided a method for manufacturing a polarizing film comprising the steps of: immersing a polyvinyl alcohol resin film in a dyeing processing tank for storing a dyeing process liquid; immersing the polyvinyl alcohol resin film after the step of immersing the dyeing process liquid in the dyeing processing tank in a crosslinking treatment tank for storing a crosslinking process liquid; obtaining a particle-containing liquid containing a particle including the polyvinyl alcohol resin film by applying shearing force to at least a part of the crosslinking process liquid extracted from the crosslinking process liquid in the crosslinking treatment tank; and removing the particle from the particle-containing liquid.SELECTED DRAWING: Figure 1 【課題】ポリビニルアルコール系樹脂フィルムの湿式処理に用いる処理液から析出する析出物の上記フィルムへの付着を抑制しながら、偏光フィルムを安定的に連続製造することのできる方法を提供する。【解決手段】ポリビニルアルコール系樹脂フィルムを、染色処理液を収容する染色処理槽に浸漬させる工程;染色処理槽に浸漬させる工程後のポリビニルアルコール系樹脂フィルムを、架橋処理液を収容する架橋処理槽に浸漬させる工程;架橋処理槽内の架橋処理液から抜き出される少なくとも一部の架橋処理液に対してせん断力を付与することによって、ポリビニルアルコール系樹脂を含む粒子を含有する粒子含有液を得る工程;粒子含有液から上記粒子を除去する工程を含む偏光フィルムの製造方法が提供される。【選択図】図1