Table of Contents
What is MFI in injection molding?
3.3. 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.
What polymers are used in injection Moulding?
Most Common Thermoplastics Used In Injection Molding
- Acrylonitrile Butadiene Styrene. Acrylonitrile Butadiene Styrene (ABS), is an opaque thermoplastic and amorphous polymer.
- Polyethylene.
- Polycarbonate.
- Polyamide (Nylon)
- High Impact Polystyrene.
- Polypropylene.
How is injection Moulding used in polymer processing?
Injection Molding is a process in which molten polymer is forced under high pressure into a mold cavity through an opening (sprue). Heating elements, placed over the barrel, soften and melt the polymer. The mold is equipped with a cooling system providing controlled cooling and solidification of the material.
How do you increase PP 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 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.
What is the MFI of PVC?
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.
What materials can be used in injection moulding?
There are ten commonly used plastic injection molding materials:
- acrylic (PMMA)
- acrylonitrile butadiene styrene (ABS)
- nylon polyamide (PA)
- polycarbonate (PC)
- polyethyelene (PE)
- polyoxymethylene (POM)
- polypropylene (PP)
- polystyrene (PS)
What products are made using injection moulding?
Injection moulding is used to create many things such as wire spools, packaging, bottle caps, automotive parts and components, toys, pocket combs, some musical instruments (and parts of them), one-piece chairs and small tables, storage containers, mechanical parts (including gears), and most other plastic products …
What is the unit of MFI?
MFI is expressed in grams of polymer per 10 minutes of duration of the test.
What do you mean by MFI?
Microfinance institutions (MFIs) are financial companies that provide small loans to people who do not have any access to banking facilities. The definition of “small loans” varies between countries. In India, all loans that are below Rs. 1 lakh can be considered as microloans.
Why do we use low MFI polymeric materials for injection molding?
Low MFI polymeric materials are not used in the injection molding technique, but low viscous materials are used. For example, ABS RS-650* has MFI – 6.825g/10min (220’C/10kg) – Extrusion grade ABS HI121U* has MFI – 22g/10min (220’C/10kg) – Injection grade *Data reference: www.matweb.com The reason, we use low MFI polymer for extrusion is as below
What is the difference between high MFI and low MFI polymers?
A low MFI polymer has a higher molecular weight than a high MFI grade of the same polymer. In general extrusion can be performed with polymers with lower melt flow indices than injection moulding.
What is MFI and why is it important?
Knowing the MFI of a polymer is vital to anticipating and controlling its processing. Generally, higher MFI polymers are used in injection moulding, and lower MFI polymers are used with blow moulding or extrusion processes. What affects the melt flow properties of polymers? Many factors affect polymers’ flow properties.
What type of plastic is used in injection molding?
Most Common Thermoplastics Used In Injection Molding. Thermoplastic injection molding is the most common way to manufacture parts. Thermoplastics are polymers that can be repeatedly molten or softened by heating and solidified by cooling—as a physical change rather than a chemical change that takes place during the creation of thermoset materials.