From breakthrough technology in the industry’s most complete line of sensors to renowned quality and performance in indicators, controls, and analytical instruments Dynisco has demonstrated the skill, experience and know-how that not only deliver the right solution for your unique application, but also provide unparalleled customer support.
Effects of Viscoelastic Properties of Polymer Melts on the Entrance Flow Pattern
Analyzing elastic properties and predicting flow instability of viscoelastic polymers is important for designing dies and flow systems in an extrusion process simulation or quality/process control purposes. This is even more essential for the processes that are involved with stretching of polymer melt such as film/sheet extrusion or blown film extrusion
To provide explanation and education of relevant ASTM test methods for obtaining apparent viscosity and shear rate measurements of polymers, which will include comprehensive training on the set up, LABKARS software interface, operation, and general maintenance of the equipment.
LCR7000 Series Capillary Rheometer
Dynisco has an extensive worldwide network of experts with thousands of years of combined pressure and application experience whose mission is to partner with you to optimize your system, solve problems and keep your operations efficient and cost-effective.
Simplified Rheology for the Masses
We address issues such as the need to test polymers, the correlation of lab values to online production, and the impact of melt flow index and viscosity on part quality and profitability.
Simplified Rheology: A Technical Discussion
Understand technical aspects of how parameters change between laboratory standards and production and how advanced equipment today can adjust for these differences.
It can be very difficult, if not impossible, to achieve complete indentification of most polymer products. However, in most cases, this is usually not needed; what is needed is the separation, or identification, of numerous molding materials whose identity has been lost, or an indication of the type of material used to create a component.
The following instructions will resolve the key violation error that appears in Labkars software, which is used to control our LCR7000 series capillary rheometers
The Pressure transducer will allow the end user to monitor pressure in the capillary. High shear rate flow testing is commonly carried out by forcing the melted plastic material through a die of specified size, using piston at a known piston speed and material temperature. The pressure, or force, required to maintain the specified flow rate is measured. The piston speed is then changed and the new force or pressure generated at this speed, is measured and recorded. For each piston speed a force or pressure is recorded. Knowing the barrel dimensions and the piston speed, the volumetric flow rate through the die can be calculated. In turn the shear stress and the shear rate are calculated and used to construct flow curves.
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