Simulation of crystallization evolution of polyoxymethylene during microinjection molding cycle

2019 ◽  
Vol 31 (4) ◽  
pp. 838-852 ◽  
Author(s):  
Benayad Anass ◽  
Boutaous M'hamed ◽  
El Otmani Rabie ◽  
El Hakimi Abdelhadi ◽  
Touache Abdelhamid ◽  
...  
Keyword(s):  
Microinjection Molding

Moldability improvement in microinjection molding via film lamination

2021 ◽  
pp. 096739112098650
Author(s):  
Dah Hee Kim ◽  
Young Seok Song
Keyword(s):  
Heat Transfer ◽  
Light Guide ◽  
Wall Slip ◽  
Skin Layer ◽  
Pattern Transfer ◽  
Plastic Plate ◽  
Resin Infusion ◽  
Microinjection Molding ◽  
Insulation Effect ◽  
Thin Plastic

The purpose of this study is to integrate a polymeric film onto a mold to impede thermal heat transfer during resin infusion. A thin plastic plate was fabricated by using microinjection molding. A polyimide (PI) film was laminated onto a mold in an effort to produce a thin light guide plate (LGP). The film could decelerate the solidification of molten polymer in the cavity of mold and enhance the wall slip of resin on the mold. The insulation effect was modeled numerically. The surface roughness and pattern transfer characteristics of the LGP were evaluated. It was found that the fluidity of the resin increased due to the decreased skin layer during mold filling. The results showed that the strategy proposed in this study could help decrease the thickness of LGP effectively when manufacturing the part via injection molding.

Micro-Injection Molding of Polymer Nanocomposites Composition-Process-Properties Relationship

2021 ◽  
Vol 36 (3) ◽  
pp. 276-286
Author(s):  
Z. Dekel ◽  
S. Kenig
Keyword(s):  
Mechanical Properties ◽  
Plug Flow ◽  
Volume Resistivity ◽  
Process Conditions ◽  
Polyamide 66 ◽  
Fountain Flow ◽  
Microinjection Molding ◽  
Injection Molded ◽  
Composition Process ◽  
Rheological Percolation

Abstract The mechanical, electrical, thermal, and rheological properties of micro injection molded nanocomposites comprising 2% and 5% carbon nanotubes (CNTs) incorporated in polycarbonate (PC), and polyamide 66 (PA) were studied. The design of experiments method was used to investigate the composition-process – properties relationship. Results indicated that the process variables significantly affected the flow patterns and resulting morphology during the filling stage of the microinjection molding (lIM) process, using 0.45 mm diameter lIM samples. Two distinct flow regimes have been identified in lIM using the low cross-section samples. The first was a conventional “fountain flow,” which resulted in a skin/core structure and reduced volume resistivity up to 10 X cm in the case of 5% CNTs and up to 100 X cm in 2% CNTs, in both polymers, respectively. In addition, inferior mechanical properties were obtained, attributed to polymer degradation under high shear rate conditions, when practicing high injection speeds, high mold temperatures, and high screw rotation velocities. The second was a “plug flow” due to wall slippage, obtained under low injection speeds, low mold temperatures, and low rotation velocities, leading to a substantial increase in modulus of elasticity (60%) with increased electrical resistivity up to 103 X cm for 5% CNTs and 105 X cm for 2% CNTs, respectively. The rheological percolation threshold was obtained at 2% CNTs while the electrical threshold was attained at 0.4% CNTs, in both polymers. It was concluded that in lIM, the process conditions should be closely monitored. In the case of high viscous heating, degradation of mechanical properties was obtained, while skin- core morphology formation enhanced electrical conductivity.

Microinjection Molding

2015 ◽  
pp. 1-10
Author(s):  
Fred Chiou
Keyword(s):  
Microinjection Molding

Polymeric microneedle fabrication using a microinjection molding technique

2006 ◽  
Vol 13 (5-6) ◽  
pp. 517-522 ◽  
Author(s):  
Firas Sammoura ◽  
JeongJin Kang ◽  
Young-Moo Heo ◽  
TaeSung Jung ◽  
Liwei Lin
Keyword(s):  
Microinjection Molding

A stress induced crystallinity model under the microinjection molding process

2020 ◽  
Author(s):  
Anass Benayad ◽  
Abdelhadi El Hakimi ◽  
Rabie EL Otmani ◽  
Abdelhamid Touache ◽  
M'hamed BOUTAOUS
Keyword(s):  
Molding Process ◽  
Microinjection Molding

Microinjection Molding of Polymers for Biomimickry of Organ Tissue

2012 ◽  
Vol 68 (10) ◽  
pp. 8-12 ◽  
Author(s):  
John W. Rodgers ◽  
Burak Bekisli ◽  
John P. Coulter
Keyword(s):  
Microinjection Molding ◽  
Organ Tissue

Microinjection molding of polyoxymethylene/multiwalled carbon nanotubes composites with different matrix viscosities

2020 ◽  
Vol 138 (6) ◽  
pp. 49817
Author(s):  
Shengtai Zhou ◽  
Xue Lei ◽  
Junqi Mei ◽  
Andrew N. Hrymak ◽  
Musa R. Kamal ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Multiwalled Carbon Nanotubes ◽  
Multiwalled Carbon ◽  
Microinjection Molding

Crystalline structure and remarkably enhanced tensile property of β-isotactic polypropylene via overflow microinjection molding

2019 ◽  
Vol 76 ◽  
pp. 448-454 ◽  
Author(s):  
Zhongzhu Liu ◽  
Xianhu Liu ◽  
Lele Li ◽  
Guoqiang Zheng ◽  
Chuntai Liu ◽  
...  
Keyword(s):  
Tensile Property ◽  
Crystalline Structure ◽  
Isotactic Polypropylene ◽  
Microinjection Molding

scholarly journals Rapid Prototyping of Plastic Lab-on-a-Chip by Femtosecond Laser Micromachining and Removable Insert Microinjection Molding

Micromachines ◽  
2017 ◽  
Vol 8 (11) ◽  
pp. 328 ◽  
Author(s):  
Rebeca Martínez Vázquez ◽  
Gianluca Trotta ◽  
Annalisa Volpe ◽  
Giuseppe Bernava ◽  
Vito Basile ◽  
...  
Keyword(s):  
Femtosecond Laser ◽  
Rapid Prototyping ◽  
Lab On A Chip ◽  
Laser Micromachining ◽  
Microinjection Molding ◽  
Femtosecond Laser Micromachining

Multi-layered, membrane-integrated microfluidics based on replica molding of a thiol–ene epoxy thermoset for organ-on-a-chip applications

Lab on a Chip ◽  
2015 ◽  
Vol 15 (24) ◽  
pp. 4542-4554 ◽  
Author(s):  
Drago Sticker ◽  
Mario Rothbauer ◽  
Sarah Lechner ◽  
Marie-Therese Hehenberger ◽  
Peter Ertl
Keyword(s):  
Replica Molding ◽  
Microinjection Molding ◽  
Integrated Microfluidics ◽  
Organ On A Chip ◽  
Membrane Cell

Versatile microfabrication of biocompatible OSTEMER using replica and microinjection molding enables fabrication of complex multi-layered micropump and 3D multi-membrane cell chips.

Sign in / Sign up

Export Citation Format

Share Document