scholarly journals Evaluating the effect of processing parameters on the replication quality in the micro compression molding of silicone rubber

2020 ◽  
Vol 35 (14) ◽  
pp. 1567-1575 ◽  
Author(s):  
Khosrow Maghsoudi ◽  
E. Vazirinasab ◽  
R. Jafari ◽  
G. Momen
Keyword(s):  
Silicone Rubber ◽  
Processing Parameters ◽  
Compression Molding ◽  
Replication Quality

Simple Fabrication of Superhydrophobic Surfaces Using Atmospheric-Pressure Plasma

2018 ◽  
Vol 941 ◽  
pp. 1808-1814 ◽  
Author(s):  
Elham Vazirinasab ◽  
Reza Jafari ◽  
Gelareh Momen ◽  
Tony Carreira
Keyword(s):  
Chemical Composition ◽  
Plasma Treatment ◽  
Silicone Rubber ◽  
Atmospheric Pressure ◽  
Chemical Characterization ◽  
Atmospheric Pressure Plasma ◽  
Processing Parameters ◽  
Superhydrophobic Surfaces ◽  
Pressure Plasma ◽  
Number Of Passes

Nature-inspired superhydrophobic surfaces have received immense industrial and academic interest due to their non-wettability and self-cleaning properties. To fabricate superhydrophobic silicone rubber surfaces, a simple, environmentally friendly atmospheric-pressure plasma treatment was applied. The effect of diverse plasma processing parameters on the final wettability behavior of the substrates, including plasma power, plasma frequency, number of passes, plasma jet speed, plasma cycle time and distance between the nuzzle outlet and substrate, were analyzed by means of design of experiments (DoE). Surface chemical characterization illustrated the influence of plasma treatment on the chemical composition of the produced silicone rubber. Furthermore, the presence of microstructures as well as the chemical composition of the surface was confirmed using scanning electron microscopy (SEM) and Fourier transform infrared (FTIR) spectroscopy analysis.

scholarly journals Optimization of Blending Parameters and Fiber Size of Kenaf-Bast-Fiber-Reinforced the Thermoplastic Polyurethane Composites by Taguchi Method

2013 ◽  
Vol 2013 ◽  
pp. 1-5 ◽  
Author(s):  
Y. A. El-Shekeil ◽  
S. M. Sapuan ◽  
M. D. Azaman ◽  
M. Jawaid
Keyword(s):  
Processing Time ◽  
Thermoplastic Polyurethane ◽  
Processing Parameters ◽  
Compression Molding ◽  
Processing Temperature ◽  
Blending Method ◽  
Fiber Size ◽  
C 50 ◽  
Kenaf Fibers ◽  
Polyurethane Composites

“Kenaf-fibers- (KF-)” reinforced “thermoplastic polyurethane (TPU)” composites were prepared by the melt-blending method followed by compression molding. Composite specimens were cut from the sheets that were prepared by compression molding. The criteria of optimization were testing the specimens by tensile test and comparing the ultimate tensile strength. The aim of this study is to optimize processing parameters (e.g., processing temperature, time, and speed) and fiber size using the Taguchi approach. These four parameters were investigated in three levels each. The L9 orthogonal array was used based on the number of parameters and levels that has been selected. Furthermore, analysis of variance (ANOVA) was used to determine the significance of different parameters. The results showed that the optimum values were 180°C, 50 rpm, 13 min, and 125–300 micron for processing temperature, processing speed, processing time, and fiber size, respectively. Using ANOVA, processing temperature showed the highest significance value followed by fiber size. Processing time and speed did not show any significance on the optimization of TPU/KF.

Effect of Micro-Injection Molding Processing Conditions on the Replication and Consistency of a Dense Network of High Aspect Ratio Microstructures

2014 ◽  
Vol 2 (1) ◽  
Author(s):  
John W. Rodgers ◽  
Meghan E. Casey ◽  
Sabrina S. Jedlicka ◽  
John P. Coulter
Keyword(s):  
Injection Molding ◽  
Flow Rate ◽  
Mold Temperature ◽  
Processing Parameters ◽  
Molding Process ◽  
Micro Injection Molding ◽  
Fluid Behavior ◽  
Replication Quality ◽  
Average Standard Error ◽  
Experimental Trials

When molding macroscale polymer parts with a high density of microfeatures (>1 × 106/cm2), a concern that presents itself is the ability to achieve uniform replication across the entire domain. In the given study, micro-injection molding was used to manufacture microfeatured polymer substrates containing over 10 × 106 microfeatures per cm2. Polystyrene (PS) plates containing microtopography were molded using different processing parameters to study the effect of flow rate and mold temperature on replication quality and uniformity. Flow rate was found to significantly affect replication at mold temperatures above the glass transition temperature (Tg) of PS while having no significant effect on filling at mold temperatures below Tg. Moreover, replication was dependent on distance from the main cavity entrance, with increased flow rate facilitating higher replication differentials and higher replication near the gate. Simulation of the molding process was used to corroborate experimental trials. A deeper understanding of polymer fluid behavior associated with micro-injection molding is vital to reliably manufacture parts containing consistent microtopography (Note: Values are expressed in average ± standard error).

Micro-Nanostructured Silicone Rubber Surfaces Using Compression Molding

2018 ◽  
Vol 941 ◽  
pp. 1802-1807 ◽  
Author(s):  
Khosrow Maghsoudi ◽  
Gelareh Momen ◽  
Reza Jafari ◽  
Masoud Farzaneh ◽  
Tony Carreira
Keyword(s):  
Surface Roughness ◽  
Contact Angle ◽  
Silicone Rubber ◽  
Surface Characterization ◽  
Contact Angle Hysteresis ◽  
Compression Molding ◽  
Sliding Angle ◽  
Water Contact ◽  
Superhydrophobic Property ◽  
Aluminum Surfaces

A facile method is introduced for production of micro-nanostructured silicone rubber surfaces by means of direct replication using a compression molding system. The fabricated samples possessing surface roughness display water contact angle of more than 160o and contact angle hysteresis (CAH) and sliding angle of less than 5o. Such low surface wettability of silicone specimens verifies the induced superhydrophobic property. Chemically etched aluminum surfaces could work excellently as templates whose patterns were replicated on the rubber surfaces successfully. Various etching conditions were examined. Surface characterization techniques revealed the presence of micro-nanostructures on the produced silicone surfaces.

Microinjection Molding of Polymer Micromixers for Biomedical Application

2011 ◽  
Vol 138-139 ◽  
pp. 941-945 ◽  
Author(s):  
Can Yang ◽  
Xiao Hong Yin ◽  
Lei Li ◽  
Jose M. Castro ◽  
Allen Y. Yi
Keyword(s):  
Biomedical Application ◽  
Amorphous Polymer ◽  
Processing Parameters ◽  
Fabrication Process ◽  
Injection Velocity ◽  
Melt Temperature ◽  
Microinjection Molding ◽  
Packing Pressure ◽  
Replication Quality ◽  
Packing Time

In recent years, microinjection molding has been widely used for fabricating polymer components due to its cost effectiveness and mass-production capability. In this work, the fabrication process of a polymer micromixer was presented. The micromixer was designed in such a way that the fabrication process could benefit from the process capabilities of ultraprecision micromachining and microinjection molding. An amorphous polymer material polymethylmethacrylate was used to make the micromixers. Moreover, in order to investigate the effects of processing parameters on replication quality of the micromixer, four important factors in microinjection molding, namely the melt temperature, injection velocity, packing pressure and packing time were selected as variables. The experimental results showed that the melt temperature was the most important factor influencing the replication, followed by the injection velocity. However, the packing pressure and packing time had no obvious influence on the replication of the micromixer.

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