Prediction of morphology development within micro–injection molding samples

Vacuum venting is a method proposed to improve feature replication in microparts that are fabricated using micro-injection molding (MIM). A qualitative and quantitative study has been carried out to investigate the effect of vacuum venting on the nano/microfeature replication in MIM. Anodized aluminum oxide (AAO) containing nanofeatures and a bulk metallic glass (BMG) tool mold containing microfeatures were used as mold inserts. The effect of vacuum pressure at constant vacuum time, and of vacuum time at constant vacuum pressure on the replication of these features is investigated. It is found that vacuum venting qualitatively enhances the nanoscale feature definition as well as increases the area of feature replication. In the quantitative study, higher aspect ratio (AR) features can be replicated more effectively using vacuum venting. Increasing both vacuum pressure and vacuum time are found to improve the depth of replication, with the vacuum pressure having more influence. Feature orientation and final sample shape could affect the absolute depth of replication of a particular feature within the sample.

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A Study of Micro Injection Molding for High-Aspect-Ratio Optical Fiber Ferrules

10.1063/1.1766748 ◽

2004 ◽

Cited By ~ 1

Author(s):

Zheng-Guan. Lin

Keyword(s):

Aspect Ratio ◽

Injection Molding ◽

Optical Fiber ◽

High Aspect Ratio ◽

Micro Injection Molding

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Flow-induced morphology evolution of uniformly miniaturized high-density polyethylene parts prepared by micro-injection molding

The International Journal of Advanced Manufacturing Technology ◽

10.1007/s00170-013-4972-3 ◽

2013 ◽

Vol 68 (5-8) ◽

pp. 1745-1755 ◽

Cited By ~ 15

Author(s):

Can Yang

Keyword(s):

Injection Molding ◽

High Density Polyethylene ◽

High Density ◽

Morphology Evolution ◽

Micro Injection Molding

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

Materials Science Forum ◽

10.4028/www.scientific.net/msf.505-507.229 ◽

2006 ◽

Vol 505-507 ◽

pp. 229-234 ◽

Cited By ~ 5

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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