Injection Compression Molding Process and Mould Design of Plastic Optical Lens

2012 ◽  
Vol 501 ◽  
pp. 321-324 ◽  
Author(s):  
Qiu Xiang Bu ◽  
Jian Yi Zhu ◽  
Qing Zhen Yin
Keyword(s):  
Dimensional Accuracy ◽  
Compression Molding ◽  
Molding Process ◽  
Optical Lens ◽  
Stress Problem ◽  
Injection Process ◽  
Deformation Problem ◽  
Mould Design ◽  
Injection Compression Molding

The characteristic of injection compression molding technology and the application of the technology in mould for the plastic optical lens were introduced. The structure and the work principle of the mould for optical lens were designed and described, The stress problem in the injection process was resolved, the deformation problem and dimensional accuracy of product were improved.

Three-dimensional numerical analysis of injection-compression molding process

2011 ◽  
Vol 52 (4) ◽  
pp. 901-911 ◽  
Author(s):  
Jae-Yun Ho ◽  
Jang Min Park ◽  
Tae Gon Kang ◽  
Seong Jin Park
Keyword(s):  
Numerical Analysis ◽  
Three Dimensional ◽  
Compression Molding ◽  
Molding Process ◽  
Injection Compression Molding

A Numerical Study of an Injection-Compression Molding Process by Using a Moving Grid

2012 ◽  
Vol 249-250 ◽  
pp. 472-476 ◽  
Author(s):  
Bambang Arip Dwiyantoro
Keyword(s):  
Stokes Equations ◽  
Numerical Study ◽  
Three Dimensional ◽  
Compression Molding ◽  
Navier Stokes ◽  
Molding Pressure ◽  
Moving Grid ◽  
Molding Process ◽  
Melt Temperature ◽  
Injection Compression Molding

A numerical study for the simulation of melt in an injection-compression molding process by using moving grid is proposed in this paper. The fully three-dimensional Navier-Stokes equations are solved together with the front transport equation using a front capturing approach. Different from previous studies, the proposed model can take the movement of cavity through a moving grid approach. The melt filling of a disk is conducted to illustrate the applications of the proposed numerical model with several computations under different processing conditions. The numerically predicted results show the influence of compression time or compression speed in determining the molding pressure and the melt temperature.

scholarly journals An Experimental Study on Color Shift of Injection-Molded Mobile LGP Depending on Surface Micropattern

Polymers ◽  
2020 ◽  
Vol 12 (11) ◽  
pp. 2610
Author(s):  
Mooyeon Kim ◽  
Junhan Lee ◽  
Kyunghwan Yoon
Keyword(s):  
Optical Properties ◽  
High Speed ◽  
Process Conditions ◽  
Molding Process ◽  
Injection Process ◽  
Color Shift ◽  
Surface Patterns ◽  
Injection Molded ◽  
Injection Compression Molding ◽  
Total Transmittance

In the display industry, the LCD backlight unit (BLU) module is variously used in mobile phones, notebook computers, monitors, and TVs. The light guide plate (LGP), which is one of the core parts of a BLU, is getting bigger and thinner consistently. Conventional injection methods and injection processes like injection compression molding (ICM) are becoming more complex and harsher with high-speed injection at high mold and melt temperatures. These approaches lead to a change in physical properties and a decrease in optical properties such as yellowing and color shift in injection-molded parts. In the present study, an injection molding experiment was conducted to understand the effect of surface patterns and major injection process conditions like mold and melt temperatures on the color shift in injection-molded mobile LGP. Optical properties obtained by the direct and total transmittance and CIE xy chromaticity diagram for injection-molded mobile LGP were measured with a UV–visible spectrophotometer. From the measurement of patternless LGP, it was found that total or direct transmittance was not affected by molding process variables. It was also found that yellow shift, ΔE(xy), occurred as much as 0.00111 ± 0.00014, and a color shift angle, Θ(xy), of 43.05 ± 2.44° was recorded in CIE coordinates for all nine experimental cases. From the measurement of total transmittance of patterned LGP, ΔE(xy) and Θ(xx) were found to be almost the same as those of patternless LGP for the locations of low and medium density of the pattern for the LGP, T1 and T2. The measured data of direct transmittance of patterned LGP showed that additional yellow shift due to scattering caused by surface micropattern. Interestingly, Θ(xy) of patterned data remained 43.05 ± 2.44°, which was almost the same as that found in the case of patternless LGP.

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