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Ngoc Huynh
Phone: 450-641-5135
Fax: 450-641-5104
Email: ngoc.huynh@imi.cnrc-nrc.gc.ca
Real-Time Diagnostics of Foam Extrusion Process Using Non-intrusive and Non-destructive Ultrasonic Techniques
Basic Principle :
Ultrasound propagation characteristics (reflection coefficient, velocity and attenuation) are dependent on molecular, chemical and physical properties of materials.
Some Examples of Applications in Foam Extrusion Monitoring
Probing the Blowing Agent Behaviour
Sensors and System
Ultrasonic buffer rods probes, high temperature UT and a fast data acquisition system specially dedicated to foam extrusion are the key components of the technique.
Plasticization
Physical foaming agent induces plasticization of the polymer matrix, decreases viscosity and ultrasonic velocity
Monitoring ultrasonic velocity of PS + HCFC 142b one-phase mixture (high pressure)
In line-determination of foaming agent concentration
Determining in Degassing Conditions
Bubble Nucleation
When pressure decreases, phase separation occurs and bubbles nucleate. This corresponds to a rapid increase of ultrasonic attenuation and a minimum in velocity.
Easy determination of the temperature and pressure conditions of bubble nucleation.
Degassing Pressure Determination
An important parameter in developing the process is the evaluation of new foaming agent which is environmentally friendly.
Nucleating Agents
Effect and efficiency of nucleating agents can be probed in determining the degassing conditions.
Information
To learn more about these and other technologies, to benefit from NRC's R&D resources and give your firm a technological advantage, you are invited to contact IMI representatives.
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Dr. Cheng-Kuei Jen |
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Ngoc Huynh, Eng., M.A.Sc., M.B.A. |
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