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Method for manufacturing optical methacrylic resin extrusion plate

A technology of methacrylic acid and shaped methacrylic acid, which is applied in optics, optical components, nonlinear optics, etc., can solve the problems of small plate thickness changes, large plate thickness changes, and poor brightness uniformity, and achieve good plate thickness The effect of precision

Inactive Publication Date: 2010-06-16
ASAHI KASEI CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, in the usual extruded sheet, the thickness variation in the extrusion direction is small, but the thickness variation in the width direction is large, and the incident light emitted from the light source lamp installed on the light source device is emitted irregularly, and the brightness uniformity is deteriorated. Therefore, high brightness cannot be obtained

Method used

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  • Method for manufacturing optical methacrylic resin extrusion plate
  • Method for manufacturing optical methacrylic resin extrusion plate
  • Method for manufacturing optical methacrylic resin extrusion plate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0080] Using a 150mmΦ single-screw extruder (barrel temperature: 200°C-210°C-210°C-260°C-260°C-240°C from the supply side) with a T-die for plates (die temperature: 250°C), 3 polishing rolls (roller temperature: 80 ℃) adjusted temperature, and the extruded plate forming machine that traction device is formed, the mixture of the polymer-A of 100 parts by weight and the polymer-D of 50 parts by weight (table The apparent density is 0.83g / ml) and extruded with an extrusion rate of 600Kg / hr to obtain a methacrylic resin extruded sheet (extruded sheet-A) with a width of 1000mm and a thickness of 6mm. right figure 1 The indicated thickness measurement points were measured, and the plate thickness accuracy was calculated. The results are shown in Table 1.

[0081] Next, the obtained extruded board was cut into a size with a width of 241 mm and a length of 319 mm with a circular saw, and then the cut surface of the cut board was ground with a precision grinder (PLA-BEAUTY: manufactur...

Embodiment 2

[0083] Extruded sheet-B was obtained in the same manner as in Example 1 except that the blending amount of the polymer-D used in Example 1 was 100 parts by weight (apparent density: 0.88 g / ml). Similar to Example 1, thickness measurement, brightness, and bright spots were measured, and the results are shown in Table 1.

Embodiment 3

[0089] In addition to using 50 parts by weight of polymer-A, a mixture of 50 parts by weight of polymer-B (apparent density of 0.88g / ml) to replace 100 parts by weight of polymer-A used in Example 1, The same operation as in Example 1 was carried out to obtain extruded plate-F. Similar to Example 1, thickness measurement, brightness, and bright spots were measured, and the results are shown in Table 1.

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Abstract

There is provided a methacrylic resin extrusion plate formed by a mixture having an apparent density of 0.80 g / ml or above prepared by mixing methacrylic resin polymer of a definite shape having an apparent density of 0.63 g / ml to 0.78 g / ml and methacrylic resin polymer of an indefinite shape having an apparent density of 0.55 g / ml to 0.63 g / ml. The plate thickness accuracy in the width directionis controlled to be within +- 1.0% of the average plate thickness. The methacrylic resin extrusion plate for a light guide plate is preferably used for office automation devices such as a personal computer and a word processor, display devices used for various monitors displaying an image signal such as a panel monitor and a television monitor, display devices used for indoor or outdoor illumination devices and sign boards.

Description

technical field [0001] The invention relates to various monitors suitable for office automation equipment such as personal computers and word processors, displaying image signals, such as display devices used in screen monitors, TV monitors, etc., and lighting devices used in indoor and outdoor spaces. A methacrylic resin extruded plate for a light guide plate of a display device, a sign board, etc., and a manufacturing method thereof. Background technique [0002] Transparent thermoplastic resins, especially methacrylic resins, have been widely used in lighting due to their excellent light transmission and mechanical properties. Used as a light guide plate for lighting. As the method of backlighting, the following two methods are generally used: the direct type that sandwiches the light guide plate between the light source and the liquid crystal unit, and the edge lighting method that installs the light source on the edge of the light guide plate. At present, the edge ligh...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B29C47/00C08J5/18C08L33/10G02B6/00G02F1/13357B29L7/00B29K33/00B29C48/00B29C48/07B29C48/305
CPCC08L33/10C08L2205/14B29C47/0019C08J5/18G02B6/0065G02F1/133615C08J2333/10B29C47/00C08L2205/02B29C48/00B29C48/07C08L2666/06G02F1/1335
Inventor 神谷俊儿鹤田严一
Owner ASAHI KASEI CHEM CORP
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