Simulation of Injection Molding of Ultra-Thin Light Guide Plate with Hemispherical Microstructures

2012 ◽  
Vol 503 ◽  
pp. 222-226 ◽  
Author(s):  
Peng Wei Dong ◽  
Zhong Li Zhao ◽  
Da Ming Wu ◽  
Ya Yun Zhang ◽  
Jian Zhuang
Keyword(s):  
Residual Stress ◽  
Injection Molding ◽  
Production Efficiency ◽  
Light Guide ◽  
Low Cost ◽  
Mold Temperature ◽  
Main Element ◽  
Melt Temperature ◽  
Light Guide Plate ◽  
Guide Plate

Micro injection molding is used widely owing to its high accuracy, high production efficiency, low cost and can fabricate products with complex structures. For optical components, the residual stress is a main element for quality. In this research, the light guide plate is used as the study object. The light guide plate was designed by software Pro-E, and was simulated by Moldflow for filling process. Orthogonal method was used in this research. The most important factor that affects residual stress level is mold temperature. The level of the different process parameters on residual stress are mold temperature, packing time, packing pressure and melt temperature.

The Study of Micro-Injection Molding of Thin-Wall Light Guide Plate with Hemispherical Micro Structures

2012 ◽  
Vol 562-564 ◽  
pp. 611-614 ◽  
Author(s):  
Peng Wei Dong ◽  
Heng Zhi Cai ◽  
Ya Jun Zhang ◽  
Zhong Li Zhao ◽  
Xin Liang Wang
Keyword(s):  
Light Guide ◽  
Injection Pressure ◽  
Mold Temperature ◽  
Thin Wall ◽  
Filling Process ◽  
Melt Temperature ◽  
Injection Speed ◽  
Light Guide Plate ◽  
Guide Plate ◽  
Micro Structures

Micro injection molding is widely used due to it’s high accuracy, high production efficiency, low cost and the ability to fabricate products with complex structures. For thin-wall and large area parts, it is difficult to fill the cavity with micro structure. The light guide plate is a typical product. In this paper, the filling process of the light guide plate (LGP) with micro structures on the surface is studied. And the warpage of the LGP is analyzed, which affects the optical performance remarkably. Orthogonal method is used to analyze the filling process and the wrapage. The most important factor that affects the filling process and the wrapage is the injection pressure. The levels of the different process parameters on filling process are injection pressure, melt temperature, mold temperature, injection speed and packing pressure. For warpage, the sequence of the effect is injection pressure, mold temperature, packing pressure, melt temperature and injection speed.

Research on the Key Technology of Precision Injection Molding Equipment for Light Guide Plate

2009 ◽  
Vol 87-88 ◽  
pp. 306-310 ◽  
Author(s):  
Peng Cheng Xie ◽  
Gang Gou ◽  
Zhen Xing Wen ◽  
Yu Mei Ding ◽  
Wei Min Yang
Keyword(s):  
Corrosion Resistance ◽  
Injection Molding ◽  
Influencing Factors ◽  
Vapor Deposition ◽  
Physical Vapor Deposition ◽  
Light Guide ◽  
Surface Hardness ◽  
Tungsten Alloy ◽  
Light Guide Plate ◽  
Guide Plate

The light guide plate is an important element of the LCD backlight module which demands a certain degree of transparency and uniformity of gray. The defects such as black spots and yellow surface appeared when the light guide plate was processed by domestic equipments. The main problem was caused by the plasticization unit. The Influencing factors of performance for polycarbonate (PC) special screw were discussed in this paper. The conveyance capacity of melt in the metering zone of injection screws with different flight width and channel depth was analyzed by POLYFLOW software. In order to obtain high surface hardness, corrosion resistance and smoothness of PC special screw, surface coating processing was the key point for injection molding light guide plate. Moreover, the peel strength of PC with different coating processing metallic block was tested and measured. he experimental results of the analysis showed that the nickel-tungsten alloy plating and physical vapor deposition can significantly improve stripping properties, corrosion resistance and smoothness. The influencing factors of coating and PC materials’ stripping were analyzed. Through industrial testing, the defective rate of light guide plate had been greatly reduced with physical vapor deposition compared to the screw with hard chromium plating.

Effect of Injection Molding Parameters on Residual Stress of Plastic Drawing Board

2012 ◽  
Vol 629 ◽  
pp. 576-580
Author(s):  
Lan Fang Jiang ◽  
Hong Liu ◽  
Chang Guo Hu ◽  
Xian Li Chen ◽  
Zhi Jiang Lei
Keyword(s):  
Residual Stress ◽  
Injection Molding ◽  
Mold Temperature ◽  
Injection Velocity ◽  
Injection Molding Process ◽  
Range Analysis ◽  
Molding Process ◽  
Melt Temperature ◽  
Drawing Board ◽  
Warpage Deformation

Due to large planar scale and small lateral scale of plastic drawing board, it was easy to cause warpage problem in injection molding. Optimization of injection molding process was taken to reduce residual stress and improve quality. Combining orthogonal experimental method and software Moldflow, analyzed the effect of mold temperature, melt temperature, hold pressure and injection velocity on warpage deformation. It changed multi-objective optimization to single-objective optimization by weighted method. Through range analysis obtained the influence trend between parameters and comprehensive optimal object. Lastly got the optimal combination of injection molding process parameters.

Replication and comparison of concave and convex microlens arrays of light guide plate for liquid crystal display in injection molding

2010 ◽  
Vol 50 (8) ◽  
pp. 1696-1704 ◽  
Author(s):  
Jong Sun Kim ◽  
Dong Sung Kim ◽  
Jeong Jin Kang ◽  
Jong Deok Kim ◽  
Chul Jin Hwang
Keyword(s):  
Liquid Crystal ◽  
Injection Molding ◽  
Light Guide ◽  
Liquid Crystal Display ◽  
Microlens Arrays ◽  
Light Guide Plate ◽  
Guide Plate

scholarly journals Producing Hollow Polymer Microneedles Using Laser Ablated Molds in an Injection Molding Process

2021 ◽  
Author(s):  
Tim Evens ◽  
Lorenz Van Hileghem ◽  
Francesco Dal Dosso ◽  
Jeroen Lammertyn ◽  
Olivier Malek ◽  
...  
Keyword(s):  
Injection Molding ◽  
Large Scale ◽  
Low Cost ◽  
Mold Insert ◽  
High Volume ◽  
Mold Temperature ◽  
Injection Molding Process ◽  
Molding Process ◽  
Melt Temperature ◽  
Hollow Microneedles

Abstract Microneedle arrays contain needle-like microscopic structures which facilitate drug or vaccine delivery in a minimally invasive way. However, producing hollow microneedles is currently limited by expensive, time consuming and complex microfabrication techniques. In this paper, a novel method to produce hollow polymer microneedles is presented. This method utilizes a femtosecond laser to create hollow microneedle cavities in a mold insert. This mold insert is used in an injection molding process, to replicate polymethyl methacrylate microneedles. The combined effect of the mold temperature, volumetric injection rate and melt temperature on the replication fidelity was evaluated. It was found that the combination of high injection molding parameters facilitated the replication. Furthermore, the functionality of the manufactured hollow microneedles was successfully tested by injecting a controlled flow of colored water into an agarose matrix. The developed methodology enables the production of low-cost, high-volume microneedle devices, which could be a key asset for large scale vaccination campaigns.

P-70: Light Shifted Light-guide Plate for Simple Multi-view Spatial/Temporal Hybrid Autostereoscopic Display

2016 ◽  
Vol 47 (1) ◽  
pp. 1399-1401 ◽  
Author(s):  
Gun-Wook Yoon ◽  
Seok-Won Bae ◽  
Hyun-Seung Cho ◽  
Jun-Bo Yoon
Keyword(s):  
Light Guide ◽  
Autostereoscopic Display ◽  
Light Guide Plate ◽  
Guide Plate

Study on Optical Properties of Microstructure of Lightguiding Plate for Micro Injection Molding and Micro Injection-Compression Molding

2006 ◽  
Vol 505-507 ◽  
pp. 229-234 ◽  
Author(s):  
Yung Kang Shen ◽  
H.J. Chang ◽  
C.T. Lin
Keyword(s):  
Optical Properties ◽  
Injection Molding ◽  
Digital Camera ◽  
Mold Temperature ◽  
Compression Molding ◽  
Micro Injection Molding ◽  
Melt Temperature ◽  
Packing Pressure ◽  
Injection Compression Molding ◽  
Better Than

The purpose of this paper presents the optical properties of microstructure of lightguiding plate for micro injection molding (MIM) and micro injection-compression molding (MICM). The lightguiding plate is applied on LCD of two inch of digital camera. Its radius of microstructure is from 100μm to 300μm by linearity expansion. The material of lightguiding plate uses the PMMA plastic. This paper uses the luminance distribution to make a comparison between MIM and MICM for the optical properties of lightguiding plate. The important parameters of process for optical properties are the mold temperature, melt temperature and packing pressure in micro injection molding. The important parameters of process for optical properties are the compression distance, mold temperature and compression speed in micro injection-compression molding. The process of micro injection-compression molding is better than micro injection molding for optical properties.

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