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Injection molding is a hugely popular process for producing plastic products including plastic chairs, disposable glasses and plates, cases for consumer electronics, and much more. In principle, the plastic injection molding doesn't look like anything difficult; melted plastic is injected into a mold, then left to cool, and comes the plastic product. But in reality, injection molding is a bit more complex. An injection molding machine has three main components: the injection unit, the mold, and the clamp. Plastic pallets in the hopper are forwarded into the barrel of the injection unit. Inside extruder's barrel, a screw pushes the pallets forward, while the heated bands that are wrapped around the barrel warm up the pallets as they move forward, they then slowly melt and become entirely molten as soon as they reach the front of the barrel. Once enough molten plastic is present in front of the screw, it runs forward like a plunge of a needle. In the very next moment, the screw pushes the molten plastic into the empty part of the mold, where the plastic hardens in a few seconds. The mold opens, and the part is ejected. The mold then closes, and the whole process is repeated. There are four types of plastic injection machinery manufactured today; hydraulic, mechanical, electric, and pneumatic.