How do you calculate melt flow index?

A weight specified for the material is applied to a plunger and the molten material is forced through the die. A timed extrudate is collected and weighed. Melt flow rate values are calculated in g/10 min. melt flow rate = g/10 min.

How does melt flow index work?

Melt Flow Index (MFI) is a measure of how many grams of a polymer flow through the die in ten minutes. Gravity then takes over and forces the plastic through a die. The test sample is then collected and weighed. The results are then extracted to determine how many grams of plastic came out over a 10 minute period.

What is the unit for melt flow index?

Originally called Melt Flow Index or Melt Index (typically for polyethylene, but applied to a variety of materials), the standard designation today is Melt Mass-Flow Rate or MFR, which is a mass flow expressed (SI units) in g/10min.

What is difference between MFR and MFI?

Melt flow index (MFI) or Melt Flow Rate (MFR) is a measure of a given polymers’ flow characteristics also known as the Rheological properties in the molten state under a known applied pressure….Hygroscopic Polymers.

How can I increase my 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.

What is melt volume flow rate?

It is defined as the mass of polymer in grams flowing per 10 minutes through a capillary of specific diameter and length by a pressure applied via a range of standard weights at specified temperature. …

What is a high melt flow rate?

Melt flow rate is an indirect measure of molecular weight, with high melt flow rate corresponding to low molecular weight. At the same time, melt flow rate is a measure of the ability of the material’s melt to flow under pressure.

What is the melt flow index of PVC?

The result of the test with this PVC sample showed a regular flow and a standard deviation of the encoder acquisition points of less than 1\% in a single measure. The measured MFR value was found equal to 7.27 g/10 min and related MVR 5.99 cm3/10 min, with a measured melt density of 1.2 g/cm3.

Is MFI same as RSI?

The MFI and RSI are very closely related. The main difference is that MFI incorporates volume, while the RSI does not. Proponents of volume analysis believe it is a leading indicator. Therefore, they also believe that MFI will provide signals, and warn of possible reversals, in a more timely fashion than the RSI.

Why did MFI go out of business?

The business ceased trading by 19 December 2008, after the administrators failed to find a buyer. It struggled to make profits during the 2000s, as chains such as B&Q and Argos introduced their own furniture lines, and rival chain IKEA (who arrived in the United Kingdom in the second half of the 1980s) expanded.

Which year is MFI?

‘Microfinancing’ was introduced in India in the 1980s as a solution to poverty and to empower women.