What is the melt flow index of PET?
The value of the intrinsic viscosity for the PET resin is very important and analogous to the Melt Flow Index (MFI). In general, bottles made from PET have an intrinsic viscosity value IV of about 0.8 dl / g. Otherwise, food trays have a measurement of about 0.6 dl / g.
What is the melt flow index of polyethylene?
3.3. 1 Melt Flow Index
| Plastic/Polymer | ASTM Standard Conditions (°C/kg) |
|---|---|
| Polyethylene (PE) | 125/0.325, 125/2.16, 250/1.2, 190/0.325, 190/2.16, 190/21.60, 190/10, 310/12.5 |
| Polycarbonate (PC) | 300/1.2 |
| Polypropylene (PP) | 230/2.16 |
| Polyphenyl sulfone (PPSU) | 365/5.0, 380/2.16 |
What is melt flow index for polypropylene?
The polypropylene used in this research is grade EH-102 of the company “PETKIM.” The most important reason for choosing this material is that its melt flow index (9.0–13.0 g/10 min) is high and it is possible to use this material in combination with relatively high filler contents.
How do you calculate melt flow index?
Test Procedure: 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.
What does a higher melt flow index mean?
lower material viscosity
Melt Flow Indexer In general, a higher MFI indicates a lower material viscosity, and when comparing polymers of the same class, a lower melt flow rate corresponds to a higher molecular weight and/or less branching.
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 difference between MFI and MFR?
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.
| Hygroscopic | Non-Hygroscopic |
|---|---|
| PC | Polystyrene |
| PMMA | |
| Polyurethane |
What is the formula of flow index?
Flow index If = (W2-W1)/(logN1/N2) = slope of the flow curve.
What is melt volume flow rate?
The Melt Flow Rate is a measure of the ease of flow of melted plastic and represents a typical index for Quality Control of thermoplastics. An alternative quantity is the volume flow expressed (SI units) in cm3/10min, called Melt Volume-Flow Rate or MVR. …
What is a high melt flow index?
Melt Flow Indexer In general, a higher MFI indicates a lower material viscosity, and when comparing polymers of the same class, a lower melt flow rate corresponds to a higher molecular weight and/or less branching.
What is the flow index?
Flow Index (If) is defined as the rate at which a soil mass loses its shear strength with an increase in water content. It is obtained by the slope of the curve drawn for Water content v/s Number of blows.
How do you calculate soil flow index?
The slope of this curve gives us an indication about the shear strength of the soil and it is known as flow index of the soil. It is denoted as IF. Slope of this curve can be calculated by taking any two water contents w1 and w2 and their corresponding number of blows N1 and N2.
What is the melt flow index of a die?
The melt flow index is the amount measured in grams that exits the die in 10 minutes. Each resin system has a specific orifice length and diameter, barrel temperature, and piston load specified in ASTM D1238–86 or ISO R1133 test methods. At the end of the test, the die and barrel are cleaned. Figure 21.1.. Tinius Olsen melt flow index tester.
What determines the melt flow index of plastic waste?
Your melt flow index is therefore set by the types of plastic you have in your mixed plastic waste stream. This depends on the source of the material. A post consumer mixed rigids stream is likely to have much more injection moulded items in it, than a post industrial rigid stream.
What is the melt flow index of polypropylene?
Polypropylenes for thermoforming typically have a melt flow index in the range 1.8 to 8.0. Homopolymers are widely used; nucleated grades are used for improved clarity and stiffness and for melt phase processing.
What is the difference between PE and PP melt flow?
In the case of a more rural recycling site, their PP melt flow is likely to be lower, around 18MFI – this is because the source is more agricultural than compared to a city recycling site, with less injection mould material present. The PE is essentially the same, but the other way round.