Highly Irregular Surface Roughness Replicated onto Microfluidic Part Using Micro Injection Molding for Cell Biological Research Purposes

2013 ◽  
Author(s):  
S. Y. Choi ◽  
O. Habimana ◽  
P. Flood ◽  
S. O. Gargan ◽  
B. Murphy ◽  
...  
Keyword(s):  
Surface Roughness ◽  
Injection Molding ◽  
Biological Research ◽  
Irregular Surface ◽  
Micro Injection Molding

scholarly journals Efficient and Precise Micro-Injection Molding of Micro-Structured Polymer Parts Using Micro-Machined Mold Core by WEDM

Polymers ◽  
2019 ◽  
Vol 11 (10) ◽  
pp. 1591 ◽  
Author(s):  
Qianghua Liao ◽  
Chaolan Zhou ◽  
Yanjun Lu ◽  
Xiaoyu Wu ◽  
Fumin Chen ◽  
...  
Keyword(s):  
Surface Roughness ◽  
Injection Molding ◽  
Electrical Discharge Machining ◽  
Minimum Size ◽  
Injection Velocity ◽  
Injection Molding Process ◽  
Replication Rate ◽  
Molding Process ◽  
Micro Injection Molding ◽  
Melt Temperature

In this paper, micro-structured polymer parts were efficiently and accurately fabricated by micro-injection molding using a micro-structured mold core machined by wire electrical discharge machining (WEDM). The objective was to realize low-cost mass production and manufacturing of micro-structured polymer products. The regular micro-structured mold core was manufactured by precise WEDM. The micro-structured polymer workpieces were rapidly fabricated by micro-injection molding and the effects of the micro-injection molding process parameters on replication rate and surface roughness of micro-structured polymers were systematically investigated and analyzed. It is shown that the micro-structured polymer can be rapidly and precisely fabricated by the proposed method. The experimental results show the minimum size machining error of the micro-structured mold core and the maximum replication rate of micro-formed polymer were 0.394% and 99.12%, respectively. Meanwhile, the optimal micro-injection molding parameters, namely, jet temperature, melt temperature, injection velocity, holding pressure and holding time were 195 °C, 210 °C, 40 mm/min, 7 Mpa and 5 s, respectively. The surface roughness Ra at the groove bottom and top of the micro-structured polymer workpieces achieved minimum values of 0.805 µm and 0.972 µm, respectively.

Effect of cavity surface roughness and wettability on the filling flow in micro injection molding

2019 ◽  
Vol 43 ◽  
pp. 105-111 ◽  
Author(s):  
R. Surace ◽  
M. Sorgato ◽  
V. Bellantone ◽  
F. Modica ◽  
G. Lucchetta ◽  
...  
Keyword(s):  
Surface Roughness ◽  
Injection Molding ◽  
Cavity Surface ◽  
Micro Injection Molding

Effect of Tooling Surface Roughness in Micro-Injection Molding

2008 ◽  
Author(s):  
Sung-Hwan Yoon ◽  
Jun S. Lee ◽  
Ji-Sun Im ◽  
Xugang Xiong ◽  
Nam-Goo Cha ◽  
...  
Keyword(s):  
Surface Roughness ◽  
Injection Molding ◽  
Research Result ◽  
Root Mean Square Roughness ◽  
Micro Injection Molding ◽  
Molded Part ◽  
Polymer Adhesion ◽  
Surface Polishing ◽  
Mold Making ◽  
Molded Parts

Quality of tooling surface has been considered as one of the important factors defining the injection molded part quality. Therefore, surface polishing has been an important and relatively expensive step in conventional mold making process. Although the poor surface quality impacts the product quality when molding macroscale parts, it becomes more significant with sub-micrometer features. Previous micro injection molding research result has indicated that rough tooling surface may cause polymer adhesion on the tooling surface. To evaluate the effect of roughness, optical grade polycarbonate was molded using silicon inserts with artificially generated surface roughness (root-mean-square roughness: 3∼143 nm) by dry etching. The silicon and molded parts surface were characterized using atomic force and scanning electron microscopy. Filling and ejection of the parts as well as residual polymer on the tooling correlated surface roughness of the tooling.

scholarly journals Vacuum Venting Enhances the Replication of Nano/Microfeatures in Micro-Injection Molding Process

2016 ◽  
Vol 4 (2) ◽  
Author(s):  
Seong Ying Choi ◽  
Nan Zhang ◽  
J. P. Toner ◽  
G. Dunne ◽  
Michael D. Gilchrist
Keyword(s):  
Injection Molding ◽  
Quantitative Study ◽  
Vacuum Pressure ◽  
Injection Molding Process ◽  
Anodized Aluminum ◽  
Molding Process ◽  
Micro Injection Molding ◽  
Sample Shape ◽  
Final Sample ◽  
Qualitative And Quantitative Study

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.

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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