What is the MFI of PP?
3.3. 1 Melt Flow Index
| Plastic/Polymer | ASTM Standard Conditions (°C/kg) |
|---|---|
| Polycarbonate (PC) | 300/1.2 |
| Polypropylene (PP) | 230/2.16 |
| Polyphenyl sulfone (PPSU) | 365/5.0, 380/2.16 |
| Polystyrene (PS) | 200/5.0, 230/1.2, 230/3.8, 190/5.0 |
Can you melt polyethylene terephthalate?
Polyethylene terephthalate is generally “thermoplastic” (as opposed to “thermoset”) material which has to do with the way the plastic responds to heat. A major useful attribute about thermoplastics is that they can be heated to their melting point, cooled, and reheated again without significant degradation.
What is MFI in HDPE?
The Melt Flow Index (MFI) is a measure of the ease of flow of the melt of a thermoplastic polymer. Melt flow rate is very commonly used for polyolefins, polyethylene being measured at 190 °C and polypropylene at 230 °C.
How do you melt polyethylene terephthalate?
Melting the Plastic
- Take the toaster oven outside and heat to 250 degrees Fahrenheit.
- Place the metal container in the toaster oven for three to four minutes.
- Remove the metal container from the toaster oven using protective gloves or oven mitts once the plastic is completely melted.
What is the melting point of LDPE?
Because the branches prevent the polyethylene molecules from packing closely together in hard, stiff, crystalline arrangements, LDPE is a very flexible material. Its melting point is approximately 110 °C (230 °F).
What is the use of polyethylene terephthalate?
PET (also abbreviated PETE) is short for polyethylene terephthalate, the chemical name for polyester. PET is a clear, strong, and lightweight plastic that is widely used for packaging foods and beverages, especially convenience-sized soft drinks, juices and water.
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.
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 should the melt flow index be for polypropylene?
For example, to extrude polyethylene with wood flour, an MFI as low as 0.3–1 g/10 min (190 °C) may be used, for polypropylene MFI values of 2–12 g/10 min (230 °C) may be used; however, for injection moulding PP, a much higher MFI of 30–70 g/10 min may be needed, to allow for some reduction in MFI on fibre addition, but maintain good mould filling.
How is the melt flow index ( MFI ) calculated?
This obtained data was compared with standard polymer and cross checked. The temperature for the MFI calculation is taken 230°C and the standard weight is taken as the 3.2 kg. MFI of the material is calculated as the mass of the material in grams flowing per 10 min.
What is the melt flow index of Virgin PA6?
Fig. 4. MFI tester (Source: GNDEC Ludhiana). It was observed that MFI of virgin PA6 was 23.30 g/10 min whereas MFI of recycled PA6 was 19.01 g/10 min. The decrease in MFI of recycled PA6 showed degradation in flow-ability of material after its recycling.
Why is melt flow index important for PP fiber?
In PP fiber applications, major increases in melt flow index (above 400 MFI) can allow the production of thinner fibers, improving productivity and the fiber’s insulation, absorption, or filtration qualities in nonwoven fiber products.