Elongational Rheometer / In-line Rheometer

Product catalog summary

Overview
The document provides an in-depth analysis of the Leistritz elongation rheometer, a cutting-edge device designed for inline measurement of shear and elongational viscosity during extrusion processes. It emphasizes the rheometer's capability to deliver real-time data on melt quality, which is essential for ensuring product consistency and quality.

Key Features

Incorporates a patented hyperbolic slot die for maintaining constant elongation flow.
Facilitates inline measurement of shear viscosity (10 to 10,000 s-1) and elongational viscosity (5 to 75 s-1).
Offers seamless integration into existing extrusion processes, with options for stand-alone or integrated control systems.

Operating Principle
The rheometer employs a patented slot die to create a constant elongation flow, enabling the simultaneous recording of shear and elongational viscosity values. It includes a precise melt pump to ensure accurate volume flows and can return material to the main process to prevent loss.

Applications

Applicable to a broad range of polymers, including thermally sensitive materials.
Utilized in various compounding processes, including those involving high to low viscosity compounds, fiber and injection molding applications, and materials with glass, natural fibers, talcum, or nanoclays.

Case Studies

Polymer Preparation: Showed significant degradation in viscosity after multiple processing cycles, demonstrating the rheometer's effectiveness in monitoring polymer degradation.
Polymer Blend Development: Assisted in optimizing blends by providing rheological data during tests, enhancing material properties like impact resistance.
Fiber Compounds: Elongational viscosity data aids in analyzing fiber content and distribution, offering insights into processing behavior.

Conclusion
The Leistritz elongation rheometer significantly improves process monitoring by providing detailed, real-time data on melt quality, enabling better control and optimization of extrusion processes.

Introduction
This section discusses the use of twin-screw extruders to enhance impact resistance in polypropylene blends. It highlights the effects of reducing high-molecular polypropylene on shear and elongational viscosity, and the limitations of using Melt Flow Rate (MFR) as the sole indicator for polymer application suitability.

Viscosity Analysis
The document explains that reducing high-molecular polypropylene decreases both shear and elongational viscosity. It emphasizes that MFR, often used to determine polymer application range, may not provide comprehensive insights, as demonstrated by the comparison of high-molecular PP-RA130E and a polymer blend BA202/IM75. The document suggests that shear viscosity increases with higher shear rates, aligning with a 50:50 blend, while elongational viscosity remains consistent with a 50:50 blend.

Extrusion Rheometer
The newly developed extrusion rheometer measures two shear viscosity values and one elongational viscosity value in a single pass, reducing misinterpretation risks. It is particularly useful for analyzing fiber compounds, as elongational viscosity is sensitive to fiber content and distribution.

Technical Data
The document provides technical specifications for the extrusion equipment, including drive motor type, cooling method, rated power, gear ratio, and permissible drive torque and speed. It also details the melt pump specifications, such as operating temperature, delivery volume, and pressure limits.

Software and Visualization
The rheometer is available in process monitoring and research versions, with software for visualizing measurement results. The research version can automatically determine complete viscosity curves and correct viscosity data. The process monitoring version integrates into continuous plastics processing operations, recording shear and elongational viscosity values.

Special Features
The rheometer features a compact design, bypass for material return, warnings and alarm limits, and easy installation. It supports temperature control, monitoring of fixed speed and torque, and data recording in CSV format.

Global Availability
Leistritz Extrusion Technology is available worldwide, with offices in Germany, USA, Italy, France, Singapore, and China.

Catalog excerpts

Elongational Rheometer / In-line Rheometer-1

Online measurement of shear and elongational viscosity

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Elongational Rheometer / In-line Rheometer-2

INLINE MEASUREMENT OF THE MELT QUALITY HYPERBOLIC SLOT DIE Innovative and patented Intelligent process monitoring How often does the melt quality drop during a compounding process – without the operator immediately recognizing it? More often than you might think! There are many reasons for quality reduction: Perhaps the polymer or filler used in the extrusion process comes from another batch. Maybe the side feeder was clogged without anyone noticing. In order to be able to constantly assess the melt quality, the decisive key data must be determined during the process. Up to now, only individual...

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Elongational Rheometer / In-line Rheometer-3

ŋelong X-Die (200 °C) ŋshear PPR (200 °C) ŋshear X-Die (200 °C) ŋshear ipec-II (200 °C) ŋelong HPCR Cogswell (200 °C) ŋelong ipec-II (200 °C) ŋelong K-BKZ visc. (200 °C) ŋelong SER (150 °C) ŋelong SER ŋelong HPCR Cogswell ŋelong X-Die ŋelong ipec-II Shear or elongational viscosity 10 Pa·s Shear or elongational viscosity ŋelong K-BKZ visc. ŋshear PPR ŋshear HPCR ŋshear ipec-II POSSIBLE APPLICATIONS Measurement Technology Measurement Technology Shear or elongational viscosity Shear or elongational viscosity Polymer blend development design process. This permits the process as well as the material...

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Elongational Rheometer / In-line Rheometer-4

TECHNICAL INFORMATION Visualization of measurement results The Leistritz elongation rheometer is available as process monitoring or as research version, with different evaluation and control software: The research version can automatically determine complete elongational and shear viscosity curves by processing a pre-defined volume throughput, and provides direct access to the recorded data. Using this process variant, you can determine the MFR and IV values. In addition, this version enables you to correct the viscosity data according to Weissenberg-Rabinowitsch and Cogswell. With the process...

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Elongational Rheometer / In-line Rheometer-5

EXTRUSION TECHNOLOGY Available for you all over the world Leistritz Advanced Technologies Corp., Somerville, NJ Headquarters Leistritz Extrusionstechnik GmbH, Nuremberg Leistritz Machinery (Taicang) Co., Ltd., Taicang Leistritz Italia Estrusione, Castellanza Leistritz France Extrusion, Ceyzeriat ↗↗ Leistritz Extrusionstechnik GmbH | Markgrafenstraße 36-39 | 90459 Nuremberg | Germany T +49 911 4306-0 | [email protected]

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Elongational Rheometer / In-line Rheometer

Elongational Rheometer / In-line Rheometer

Catalog excerpts

All Leistritz Extrusionstechnik GmbH catalogs and technical brochures