How do you control MFI?

You can increase MFI by mixing with some lubricant. However it may reduce mechanical properties. So it would be better to conduct a small scale experiment in advance to know the optimum amount of lubricant you should add.

How do you increase polyethylene MFI?

indeed, to increase the mfi of PE, you could try to add some peroxide agent to cut the polymer chain. but it would change the properties of the materials. Besides the suggestion made by Mr. Wang, please remember peroxides has two action modes: chain scissor and crosslinking.

What is MFI in plastic industry?

1 Melt Flow Index. The melt flow index (MFI) is a measure of the ease of flow of the melt of a thermoplastic polymer. It is defined as the weight of polymer in grams flowing in 10 min through a die of specific diameter and length by a pressure applied by a given weight at a given temperature.

How do you increase the MFI polypropylene?

Adding proper proportion of Aria Add® 2440 in PP melt processing equipment, increases MFI to desired amounts and viscosity and elasticity behavior will be modified. So melt instability will decrease and processing would be easier.

What is the factor affecting of MFI test?

Factors that Affect Test Accuracy The melt indexer needs to be in good working order. The machine must have been calibrated by a certified metrologist, checking temperature, physical dimensions, and distance and time measurement accuracy. The machine cleanliness needs to be maintained.

How do you measure plastic MFI?

The procedure for determining MFI is as follows: A small amount of the polymer sample (around 4 to 5 grams) is taken in the specially designed MFI apparatus. A die with an opening of typically around 2 mm diameter is inserted into the apparatus.

Can MFI be considered as a rheological testing method?

After calculating polymers viscosity by using MFI tester, the method investigates rheological properties and surface shape at different temperatures and loads. The method could apply to other polymers to find the viscosity-temperature change and to set the best processing temperature.

What is the MFI of LDPE?

1. LDPE has an MFI of 0.3 ± 0.05 g/10 min; however, PLA has an MFI of 5.9 ± 0.08 g/10 min which are very close to values found for non-extruded pellets. This measurement was undertaken to check any degradation of polymers when being extruded.

Why MFI test are not followed for PVC?

The attempts to measure the MFI of recycled PVC were not successful due to the material degrading and clogging the equipment during testing. MFI is sensitive to environmental impact and thermomechanical stress, e.g. during lifespan and reprocessing.

Is standard for MFI?

The Melt Flow Index (MFI) is a measure of the ease of flow of the melt of a thermoplastic polymer. Similarly, the test conditions of MFI measurement is normally expressed in kilograms rather than any other units. The method is described in the similar standards ASTM D1238 and ISO 1133.