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Melt flow rate and melt volumeflow rate

MFR/MVR TESTER

  • Model no. 1709
  • Tests on raw materials

Defining the flow behaviour of thermoplastics safely

The 1709 MFR/MVR tester is used to determine the melt flow rate of thermoplastics. In the basic version, the melt flow rate (MFR) can be determined by manually applying test weights of 2.16 kg and 5 kg. Automatic distance measurement is available as an option for the melt volume-flow rate (MVR). Furthermore, a motorized weight loading up to 21.6 kg as well as an automatic cutting device are available as an option. The device also has an interface for an analytical balance, which means that the values determined can be transferred directly to the tester. The proven IPTDatalogging system can be connected via a further interface in order to print out and subsequently archive the test results. The device is conveniently operated via a built-in touchscreen. Extensive accessories for cleaning the test channel, nozzle and piston are of course included as standard. 

Standards

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  • ISO 1133
  • ASTM D 1238

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Features and Functionality

The basic version can be tested with temperatures between 50 °C and 300 °C. Temperatures of up to 450 °C can be optionally reached.
The target temperature can be preselected in 0.1 K increments. The regulating accuracy is 0.2 K.
High temporal and spatial temperature accuracy in the test channel is guaranteed by a self-optimising regulating system using a microprocessor with two separate heating and regulating circuits. For temperature measurement, extremely accurate resistance thermometers (Pt 100) are installed at the height of the nozzle and in the centre of the cylinder.

The touchscreen

The built-in touchscreen can be used to enter the test parameters, monitor the test and display the test results. The built-in CPU controls the test sequence, manages the testing data, calculates the test results and operates the interfaces for data logging and for an electronic analytical balance. A tolerance range can be entered to evaluate the valid measurements. Invalid measured values are specially marked in the test report, but are not used to calculate the mean value. 

The cutting device

The cutting device has been taken over from our proven predecessor model. It consists of a cutter head and an electronic control unit. The cutter head carries the blade, which can be moved in two planes. It has a long service life and is easily replaceable. During the cutting process, the knife follows a hysteresis-like curve. This largely prevents the sections from sticking to the knife.
In addition to the basic parameters, the different test types to perform the MFR tests require the following specific inputs: the time per test section and the number of sections. The MVR tests can be carried out either by specifying the time per measurement or the distance per measurement. No cutting of the test material is required.
As a special feature, this device offers the option of calculating the corresponding MFR value after an MVR test has been completed. For this purpose, the density of the sample (at test temperature) must be input. It is also possible to determine the density after an MVR test. 

The test procedures

Firstly, the relevant test parameters must be entered on the touchscreen or optionally on the data logger. If a test program has already been saved, it can be accessed by entering the corresponding program num- ber. When the heating phase is complete (readiness is also indicated by an LED and acoustic signal), the sample material is poured into the test channel. The unit then carries out the test automatically after the “Start test” input and starts the actual test automatically after the preheating time.
During the MFR test and density determination, the test sections are cut off according to the preselected num- ber. The determined weight of the manually weighed sections is either entered on the touchscreen or, if an analytical balance is connected, transmitted directly to the unit. During an MVR test, the volume is calculated using automatic distance measurement. At the end of each test, the evaluation is initiated by pressing the ‘Calculation’ button. The test result appears on the display shortly afterwards. 

Periphery and Complementary

LABORATORY GRANULATOR

  • Model no. 1665
  • Sample preparation
The laboratory granulator was developed for the production of granulates from plastic pipe slices or plastic sheets, for example for the determination of MFR/MVR values. 

Standards

  • ISO 1133
  • ISO 1183
  • ASTM D 1505
Learn more

ANALYTICAL BALANCE

  • Model no. H3000
  • Tests on raw materials
  • Sample preparation
Analysewaage

The analytical balance is required in every test laboratory. It is used to precisely determine important values such as MFR, carbon black content, K-value, degree of crosslinking, OIT, volatile components, water absorption and similar.

Standards

  • ISO 1133
  • ISO 1628-2
  • ISO 62
  • ISO 6964
  • EN 12099
Learn more