DH Series Melting Flow Index Tester High Precision Fast Melt Flow Rate Testing Machine

DH Series Melting Flow Index Tester High Precision Fast Melt Flow Rate Testing Machine

The melt flow rate meter is a special instrument for determining the melt flow rate of a thermoplastic under certain conditions. It refers to a molten material extruded from a die of a specified length and diameter under a certain temperature and load. Mass flow rate MFR or melt volume flow rate MVR, which can distinguish the viscous flow characteristics of thermoplastics in molten state; it is of great significance for the quality assurance of thermoplastics and chemical fiber raw materials, products, etc., especially in quality. Inspection and warehousing testing.

This series of melt indexer is specially designed for fast and accurate measurement. It has the characteristics of firm structure, easy operation, stable and reliable performance. It uses high-precision PID thermostat technology, high temperature control precision, nitriding of key parts, high strength and hardness. The thermal expansion deformation is small. DH-MI-BP,DH-MI-VP is a regular model, manual loading weight with automatic cutting function; DH-EI-BP,DH-EI-VP is the model with an electric loading weight with automatic cutting function.which means the weights is placed on the weight bracket in advance for electric loading and unloading, reducing manual operation. The DH-AI-VP is a fully automatic model with automatic loading weight and automatic cutting function, which automatically loads and unloads the corresponding weight according to the set mode.to further improve measurement efficiency.

GB/T3682-The measurement of the mass flow rate for thermoplastic.

The basic element of the melt indexer is to meet the accuracy requirements and test methods specified in the international standards. The standards include those common in ISO 1133, GB/T3682, JIS K 7210, ASTM D1238 and PVC tests of ASTM D3364, plus provisions in specific standards.

Determination of melt index according to Method A; melt mass flow rate (MFR)

In this method, the extrudate is cut in a specified time and the mass of the cut extrudate is weighed on an analytical balance. The test result is the mass of extrusion per unit time, in g/10 min. The quality of the resulting MFR results is related to the cutting time and the accuracy of the stated mass. If the MFR index is low and a longer cutting time is required, we recommend using manual cutting.

Determination of melt index according to Method B; melt volume flow rate (MVR)

This method requires a melt indexer/extrusion plastometer equipped with a piston displacement sensor. The MVR results are obtained by measuring the volume of the extruded material per unit time in cm3/10 min. Calculated from the displacement of the piston in a certain period of time. The significant advantage of this method is the elimination of mechanical cutting. It has the features of simultaneous recording of piston displacement and test time while achieving high accuracy, even for short measurement times and small piston displacements. Depending on the material, accuracy requirements and MVR results, the same bucket can test up to 40 separate measurements.

Determination of melt index according to Method C

A drum with a height of 8.00 mm and a nozzle with a diameter of 2.095 mm are commonly used. The MFR value measurement is better than the recommended 75 g/10 min in the standard, and the size of a "half height/half caliber" drum is 4.00/1.050 mm. This is specifically designed for ASTM D1238 Method C.

Melt Index Measurement in Method D - ASTM D1238: Multi-Step Measurement

For many polyolefins, different force values are typically used to measure the MVR and flow rate ratio (FRR). When using a simple melt indexer, multiple fillers need to be tested. The melt indexer is equipped with an automatic transformation weight unit that measures the results of individual fillers at different force values.

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