Solution film forming device and method

Abstract

The invention provides a solution film-forming apparatus and method which can suppress the drop of production efficiency and prevent uneven thickness. In the solution film-forming apparatus (10), the method includes the following steps: a cast film forming step of spilling a cast (12) to a belt (30) so as to form a cast film (14); a shifting step of drying the cast film (14) and also shifting the cast film (14) to a stripping position; and a stripping step of stripping the cast film (14) from the belt (30) at the stripping position. In the shifting step, a solvent gas is extracted from a covered internal region (74) through a drying case (64), and the drying of the cast film (14) is accelerated and the solvent gas is supplied to the gap between a shield (68, 70) and the belt (30), such that fresh air is blocked from flowing to the internal region (74).

Description

technical field [0001] The invention relates to a solution membrane forming device and method. Background technique [0002] In the market for small and medium-sized displays mounted on smartphones, tablet terminals, etc., further high-definition is required. Therefore, for films used in these displays, the smoothness on the film surface is required to be further improved than before. In addition, the films used in these displays are also required to be thinner, specifically, to be 40 μm or less. [0003] Typically, membranes are produced in long strips, cut to the desired size, and ready for use. As a method for producing a long film, it is roughly classified into a solution film forming method and a melt film forming method. Among them, the solution film forming method is more advantageous than the fusion film forming method in that a film with a smoother film surface can be produced. The solution film-making method is to form a casting film by dissolving the dope obta...

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