Malvern's Rotational and Capillary Rheometers Aid Plastic Film Development at RENOLIT AG

RENOLIT AG (Salzgitter, Germany) one of the leading international manufacturers of high-quality PVC and polyolefin films for surface refinement and technical applications, is using rotational and capillary rheometers from Malvern Instruments to determine the rheological properties of plastic melts.

The analytical laboratory at RENOLIT AG supports the company's daily production cycle and the company uses the latest analytical technologies for detailed determination of raw material and film properties. If faults occur, rapid identification of the cause is a priority. For instance, any inclusions in films or film defects are examined in order to locate the source of the defect and rectify it. RENOLIT's experiences in film analysis also make a positive contribution to new developments and the continuing advancement of films.

Using Malvern rheometers to analyze melts, it was shown that even when plastic granules used in the production of films exhibited identical shear viscosities, there were significant differences in extensional viscosity. This may be attributed to the molecular structure of the plastic, and will not be detected by shear alone. Measuring both shear and extensional viscosities across a broad range requires the use of both rotational and capillary rheometers. This complementary use of both techniques delivers valuable additional information which contributes significantly to the further development of RENOLIT plastic films. An important factor in selecting the systems was Malvern's ability to supply both types of instrument, with the benefits that service and applications support is from a single source.

RENOLIT AG ranks among the internationally leading manufacturers of high-quality PVC and polyolefin films for surface refinement and technical applications. Independent and family-owned, the company has been setting standards in terms of quality and innovation for 60 years. Presently, RENOLIT AG employs approximately 2,300 people at 8 production sites and seven distributing agencies worldwide. The brand name RENOLIT stands for technology competence, sophisticated product design and application-oriented service partnership worldwide.

Malvern Instruments is a leading supplier of analytical solutions for particle characterization and rheological applications. Advanced technologies are combined with robust mechanical designs and comprehensive software to provide systems that measure material characterization data (size distribution, particle shape, zeta potential, molecular weight) and bulk material properties. On-line, at-line and off-line solutions are provided to meet QA/QC, control and development applications across a diverse range of industries. An extensive support service facilitates the optimal design and exploitation of any given system.

For press information, please contact
Trish Appleton, Kapler Communications
Suite 2, Cressner House
12 Huntingdon Street, St Neots
Cambridgeshire UK
PE19 1BD
Tel: +44 (0) 1480 471117
Fax: +44 (0) 1480 471118

USA contact:
Marisa Fraser, Malvern Instruments Inc
10 Southville Road
Southborough, MA 01772, USA
Tel: +1 508 480 0200
Fax: +1 508 460 9692

Please send sales enquiries to:
Alison Vines, Malvern Instruments Ltd
Enigma Business Park, Grovewood Road
Malvern, Worcestershire UK
WR14 1XZ
Tel: +44 (0) 1684 892456
Fax: +44 (0) 1684 892789

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