Method for manufacturing optical film
A manufacturing method and technology of optical films, applied in optics, nonlinear optics, instruments, etc., can solve the problems of inability to manufacture polarizer protective films, optical films, etc.
Active Publication Date: 2013-09-11
FUJIFILM CORP
View PDF12 Cites 2 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
Therefore, the methods described in Japanese Patent Laid-Open No. 2006-205729 and Japanese Patent Laid-Open No. 2008-162289 cannot produce optical films requiring transparency such as polarizer protective films or retardation films.
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0029] (Solution Film Making Equipment)
[0030] Optical film (hereinafter referred to simply as film) such as by figure 1 The solution film formation apparatus 10 shown is fabricated. The solution film forming facility 10 includes a casting device 12 , a clip tenter 13 , a drying device 15 , a cooling device 48 , and a winding device 17 .
[0031] The casting device 12 has a die unit 21 , a belt 22 , a first roll 23 , a second roll 24 , and a casting chamber 25 . The die unit 21 has a feed port 28 and a casting die 29 from which the dope 31 supplied to the feed port 28 continuously flows out. Details of the mold unit 21 will be described later using other drawings.
[0032] The belt 22 is an endless casting support formed in an endless shape, and is wound around the peripheral surfaces of the first roll 23 and the second roll 24 . The first roller 23 has a rotation shaft 23 a at the center of the circular side surface, and the rotation shaft 23 a is rotated in the circumf...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
The invention provides a method for manufacturing an optical film. A flow path (70), comprising a first part (71), a second part (72), and a third part (73), is formed inside a feeding head in the upstream of a tape casting mold. The first part (71) consists of a dividing part (71a), a shifting part (71b), and a converging and compressing part (71c), which are arranged sequentially from the upstream side, and so do the second part (72) and the third part (73). Concentrated liquid is delivered to the dividing part (71a) of the first part (71) and divided into multiple flows. The multiple divided concentrated liquid flows formed by division are delivered to the shifting part (71b) and shifted to be arranged along the thickness direction. Then, the flows are delivered to the converging and compressing part (71c) so as to be converged through layered superposition and compressed along the thickness direction. The layered concentrated liquid flow is delivered to the second part (72) and the third part (73), thereby increasing the layer number of the layered concentrated liquid flow and reducing the thickness of each layer. The layered concentrated liquid flow is supplied to the tape casting mold, dried, and formed into a film.
Description
technical field [0001] The invention relates to a method for manufacturing an optical film. Background technique [0002] With the thinning of liquid crystal displays (LCDs), there is an increasing demand for thinning of the optical films constituting the LCD. Since the phase difference regarded as one of the optical characteristics of an optical film is expressed by the product of birefringence and thickness, it is necessary to control birefringence according to thickness. That is, it is necessary to increase the birefringence, especially the birefringence Rth in the thickness direction, in accordance with the thinning of the optical film. [0003] On the other hand, as a method for producing a film, there are a melt extrusion method and a solution film forming method. The melt extrusion method is a method of producing a film by extruding with an extruder after melting a polymer. The method has the characteristics of high productivity and low equipment cost. However, th...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & Authority Applications(China)
IPC IPC(8): C08J5/18
CPCG02B5/30G02F1/1335
Inventor 高瀬雅典
Owner FUJIFILM CORP