Ram recovery process turbine
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1.
Plastics consists of long chains of molecules, made of carbon that are called polymers. Polymers are composed of smaller molecules called monomers. There are two types of plastics according their origin:
-Natural plastics: that are obtained directly from vegetable or animal sources,latex and cellulose are produced by plants and casein.
-Sintetic plastics are made with compounds that come from petroleum, natural gas and carbon. Most plastics are syntetic.
2.
The industrial production of plastic from raw materials is polymerization.
It have 2 steps:
- During the manufacturing process, fillers may be added to reduce the cost of production and enhance certain properties of raw materials. Some typical fillers include fibreglass,paper,mineral powder...
- Chemical activities can also be used, such as plasticizers wich increase the flexibility and resistance of the final product. Pigments may also be added to give the plastic a certain colour.
3.
Its properties are:
- Physically resistant to stretching, bending, twisting and compression.
- Good electrical, thermal and acoustic insulators.
- Ductile, because they can be pulled to make threads.
- Malleable because they can be pressed into thin sheets.
- Light with a typical densiti of 0.9 to 1.3 grams per cubic centimetre.
- Impermeale
- Recyclable in many ways, such as:
chemical recycling, which breacks plastic down into its chemical components
mechanical recycling, which breaks plastic into small pieces that can be melted and made into tiny pellets.
enercy recovery, wich burns plastic to produce heat, electricity or or energy for other industrial processes.
-Non biodegradable plastic is made from petroleum. Most of the plastics that we use today are non biodegradable plastic.
-Biodegradable plastic is more common. Some are broken down by bacteria and other biological agents. For example biopol, is used to make bottles and mouldings.