Investigation of melt manipulation phenomena during injection molding via in situ birefringence observation

2006 ◽  
Vol 46 (12) ◽  
pp. 1691-1697 ◽  
Author(s):  
David C. Angstadt ◽  
John P. Coulter
Keyword(s):  
Injection Molding ◽  
Melt Manipulation

Development of Advanced Hybrid Polymer Melt Delivery Systems for Efficient High Precision Injection Molding

2020 ◽  
Vol 142 (7) ◽  
Author(s):  
Chandresh Thakur ◽  
Khalid Alqosaibi ◽  
Animesh Kundu ◽  
John P. Coulter
Keyword(s):  
Injection Molding ◽  
Polymer Melt ◽  
Acrylonitrile Butadiene Styrene ◽  
Experimental Investigations ◽  
Liquid Crystal Polymers ◽  
Ansys Fluent ◽  
Engineering Plastics ◽  
Software Modules ◽  
Melt Manipulation ◽  
Butadiene Styrene

Abstract A novel melt manipulation “RheoDrop” concept for hot runner injection molding is presented. In this concept, a controlled rotational shear is applied to a polymer melt in the hot drop to reduce its viscosity without raising the temperature. This is achieved by providing a transient rotational motion to the valve pin in the hot drop. This strategy is developed to mitigate issues associated with cold slug formation during injection molding in hot runner systems. The cold slug formation is particularly relevant for injection molding of engineering plastics such as liquid crystal polymers (LCPs) for medical and electronic applications. Analytical and experimental investigations were performed to validate the concept. The efficacy of the concept is assessed analytically utilizing a combination of two software modules, autodesk, moldflow and ansys fluent. The results confirmed that the concept was able to produce enough shear to reduce the dynamic viscosity between injection molding cycles. A prototype RheoDrop system was designed and developed and retrofitted in a four drop hot runner system mold to experimentally validate the concept. Preliminary experiments were performed utilizing acrylonitrile butadiene styrene, and parts were successfully fabricated at temperatures that are too low for traditional molding in a hot runner system.

Processing of PC/LCP in situ composites by closed-loop injection molding

2002 ◽  
Vol 62 (6) ◽  
pp. 757-765 ◽  
Author(s):  
Hong Shing Chan ◽  
Yang Leng ◽  
Furong Gao
Keyword(s):  
Injection Molding ◽  
Closed Loop ◽  
In Situ Composites

Dielectric studies of PVDF crystallization. Application to in-situ monitoring in injection molding

2001 ◽  
Vol 8 (6) ◽  
pp. 911-916 ◽  
Author(s):  
J.M. Gonnet ◽  
J. Guillet ◽  
G. Boiteux ◽  
R. Fulchiron ◽  
G. Seytre
Keyword(s):  
Injection Molding ◽  
In Situ Monitoring ◽  
Dielectric Studies
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