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

2004 ◽  
Author(s):  
Zheng-Guan. Lin
Keyword(s):  
Aspect Ratio ◽  
Injection Molding ◽  
Optical Fiber ◽  
High Aspect Ratio ◽  
Micro Injection Molding

scholarly journals Characterization of Stereolithography Printed Soft Tooling for Micro Injection Molding

Micromachines ◽  
2020 ◽  
Vol 11 (9) ◽  
pp. 819 ◽  
Author(s):  
Daniel Dempsey ◽  
Sean McDonald ◽  
Davide Masato ◽  
Carol Barry
Keyword(s):  
Aspect Ratio ◽  
Injection Molding ◽  
Raw Materials ◽  
Tool Material ◽  
Mold Temperature ◽  
Micro Injection Molding ◽  
Digital Light Processing ◽  
Electron Microscopies ◽  
Aspect Ratios ◽  
The Impact

The use of microfeature-enabled devices, such as microfluidic platforms and anti-fouling surfaces, has grown in both potential and application in recent years. Injection molding is an attractive method of manufacturing these devices due to its excellent process throughput and commodity-priced raw materials. Still, the manufacture of micro-structured tooling remains a slow and expensive endeavor. This work investigated the feasibility of utilizing additive manufacturing, specifically a Digital Light Processing (DLP)-based inverted stereolithography process, to produce thermoset polymer-based tooling for micro injection molding. Inserts were created with an array of 100-μm wide micro-features, having different heights and thus aspect ratios. These inserts were molded with high flow polypropylene to investigate print process resolution capabilities, channel replication abilities, and insert wear and longevity. Samples were characterized using contact profilometry as well as optical and scanning electron microscopies. Overall, the inserts exhibited a maximum lifetime of 78 molding cycles and failed by cracking of the entire insert. Damage was observed for the higher aspect ratio features but not the lower aspect ratio features. The effect of the tool material on mold temperature distribution was modeled to analyze the impact of processing and mold design.

Fabrication of High Aspect Ratio Microscale Rod Arrays Using Metal Injection Molding

2013 ◽  
Vol 716 ◽  
pp. 430-433
Author(s):  
Won Sik Lee ◽  
Jin Man Jang ◽  
Berm Ha Cha ◽  
Se Hyun Ko
Keyword(s):  
Aspect Ratio ◽  
Injection Molding ◽  
Grain Growth ◽  
High Aspect Ratio ◽  
Metal Injection Molding ◽  
Aspect Ratios ◽  
Average Size ◽  
Rod Array

In this work, micro rod arrays of 50 um and 200 um in diameter, respectively, were fabricated by 316L metal injection molding. Acryl sacrificial mold was used for the 50 um rod array. Aspect ratios were about 8 and 6 in 50 um and 200 um rod arrays, respectively and the bending of the rods occured due to high aspect ratio in debinding and sintering steps. Also, severe grain growth occurred at rod surface by sintering for 3 hrs at 1300°C and the average size was measured to be about 70 um.

Plastic Injection Molding of High-Aspect Ratio Micro-Rods

2006 ◽  
Vol 21 (8) ◽  
pp. 824-831 ◽  
Author(s):  
Nan Shing Ong ◽  
Honglin Zhang ◽  
Wai Hoong Woo
Keyword(s):  
Aspect Ratio ◽  
Injection Molding ◽  
High Aspect Ratio ◽  
Plastic Injection Molding ◽  
Plastic Injection

Simulation of Orientation in Injection Molding of High Aspect Ratio Particle Thermoplastic Composites

2008 ◽  
Author(s):  
Gregorio M. Vélez-García ◽  
Kevin C. Ortman ◽  
Aaron P. R. Eberle ◽  
Peter Wapperom ◽  
Donald G. Baird ◽  
...  
Keyword(s):  
Aspect Ratio ◽  
Injection Molding ◽  
High Aspect Ratio ◽  
Thermoplastic Composites
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