Rheometric Measuring Die Heads

A precise description of the flow processes within polymer processing machines implies exact knowledge of the rheological characteristics of polymer melts, in particular of their viscosity behavior within a wide, practice-oriented range of shear rates.

The Brabender^® capillary rheometer system, consisting of a laboratory extruder with a suitable drive unit, a rheometric capillary die head, and a high-precision melt pump covers a practice-oriented range of shear rates and allows reliable statements about the material behavior during different processing stages. The advantages as compared to conventional high-pressure capillary rheometers are evident:

• practice-oriented plastification under processing conditions

• continuous operation

• multifunctionality: processing and measuring

• All slot capillary dies are highly polished and have a special coating against corrosion and abrasion.

Slot Capillary Die Head		Slot Capillary Die Head Schematic		Rheometric Round Capillary

The program of measuring die heads is completed by several special measuring die heads:

• 2- and 3-stage slot capillary die heads

  for the determination of shear and elongational viscosity to

  assess the flow behavior of the melt

• Garvey die head (ASTM D 2230)

  special measuring die for testing elastomers

• Swelltest die head

  Channel dimensions [mm]:

  Ø 1 * 15 D

  Ø 1 * 20 D

  Ø 1 * 30 D

  Ø 2 *   5 D

  Ø 3 *   5 D

  Ø 5 *   5 D

  for measuring the swelling (visco-elastic) behavior of extruded round strands

  - precisely, contact-free, and continuously through laser-scanning