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Injection molded product

A technology of injection molding and products, which is applied in the direction of instruments, polarizing elements, and other household appliances, and can solve problems such as phase difference and optical axis direction

Pending Publication Date: 2022-02-18
LG CHEM LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the injection molding method, a large amount of stress is applied to the material, and the direction in which the stress is applied is also random, so that many phase differences appear in the product and the direction of the optical axis is also random
Therefore, when the injection molded product is a product worn or used outdoors such as glasses or goggles, a defect called a rainbow phenomenon occurs outdoors

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0085] Will be produced by injection molding polycarbonate (PC) and have such Figure 12 A rectangular shaped PC board (injection molded body) shown in is applied as a body for forming the body of the eyewear. Such as Figure 12 As shown in , the injection molded body exhibits a severe rainbow phenomenon under polarized light sources. At the same time, the injection direction of the injection molded body is approximately perpendicular to the horizontal direction (arrow direction) described in the figure. Optical compensation was performed using a PET (poly(ethylene terephthalate)) film (125 μm PET product from SKC) having an in-plane retardation of about 4400 nm at a wavelength of 550 nm as a retardation film. At this time, in the injection direction based on the injection molding body (with Figure 12 The direction perpendicular to the direction of the arrow in ) is measured in the counterclockwise direction, and the angle of the slow axis is set within a range of about 23...

Embodiment 2

[0087] Optical compensation was performed in the same manner as in Example 1, except that the injection direction based on the injection molded body (with Figure 12 The direction perpendicular to the direction of the arrow in ) is measured in the clockwise direction, and the slow axis angle of the retardation film is set in the range of about 67 degrees to 74 degrees. Figure 5 is a photograph showing the results, and no optical defect such as a rainbow phenomenon was observed in a region where a retardation film existed as in the photograph.

Embodiment 3

[0089] A PET (poly(ethylene terephthalate)) film (a film showing the grade of this in-plane retardation among SRF products from Toyobo) having an in-plane retardation to a wavelength of 550 nm of about 9800 nm was used as A retardation film was used to perform optical compensation of the same injection molded body as that of Example 1. At this time, in the injection direction based on the injection molding body (with Figure 12 The direction perpendicular to the direction of the arrow in ) is measured in the clockwise direction, and the slow axis angle is set in the range of about 38 degrees to 48 degrees. Figure 6 is a photograph showing the results, and no optical defect such as a rainbow phenomenon was observed in a region where a retardation film existed as in the photograph.

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Abstract

The present application relates to an injection molded product or eyewear. The present application relates to an optically compensated injection molded product or eyewear, and can provide the injection molded product for eliminating an optical defect such as a rainbow phenomenon, which occurs in the injection molded product or eyewear.

Description

technical field [0001] This application claims priority based on Korean Patent Application No. 10-2019-0079570 filed on July 2, 2019, the disclosure of which is incorporated herein by reference in its entirety. [0002] This application relates to injection molded products. Background technique [0003] Injection molding is a typical plastic molding method. Injection molding is one of plastic molding methods using a mold in which a material such as plastic is heated to melt, then injected into a mold and cooled to obtain a product having a desired shape. figure 1 is an example of an injection molding machine. Such as figure 1 As shown in , an injection molding machine may be composed of: a hopper C for introducing material; a cylinder A for melting the introduced material by heating; a nozzle B for injecting molten material into a mold D; and the like. use as figure 1 In the injection molding machine, the material is introduced into the hopper C, melted in the cylinder ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C45/00B29D11/00G02B5/30G02C7/02
CPCB29D11/0073B29C45/0001G02B5/30G02C7/02G02C7/022B29K2069/00B29D11/00788G02B5/3083G02C7/12B29L2011/00B29C45/0025B29K2995/0018G02B1/041G02B5/3016
Inventor 林恩政吴东炫金真弘金旼俊
Owner LG CHEM LTD