Several grades of high-density polyethylene have an MFI ranging from 0.2-3 gm/10min. Otherwise, food trays have a measurement of about 0.6 dl / g. In general, bottles made from PET have an intrinsic viscosity value IV of about 0.8 dl / g. The value of the intrinsic viscosity for the PET resin is very important and analogous to the Melt Flow Index (MFI). The most important reason for choosing this material is that its melt flow index (9.013.0 g/10 min) is high and it is possible to use this material in combination with relatively high filler contents. What is the melt flow rate of polypropylene?Ģ.1 Materials The polypropylene used in this research is grade EH-102 of the company PETKIM. Read More: What is one bead one compound? Hygroscopic 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. This measurement was undertaken to check any degradation of polymers when being extruded. 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. So it would be better to conduct a small scale experiment in advance to know the optimum amount of lubricant you should add. However it may reduce mechanical properties. You can increase MFI by mixing with some lubricant. The results are then extracted to determine how many grams of plastic came out over a 10 minute period. The test sample is then collected and weighed. … Gravity then takes over and forces the plastic through a die. Melt Flow Index (MFI) is a measure of how many grams of a polymer flow through the die in ten minutes. Melt flow rate values are calculated in g/10 min. A timed extrudate is collected and weighed. How do you calculate melt flow index?Ī weight specified for the material is applied to a plunger and the molten material is forced through the die. It is often used in the plastic industry for quality control of thermoplastics. The melt flow index (MFI) or melt flow rate (MFR) is a measure for the ease of flow of melted plastics. 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. The melt flow index (MFI) is a measure of the ease of flow of the melt of a thermoplastic polymer.
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