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The process of extrusion has lots of types, and one of them is known as plastic extrusion. In this process, raw plastic is used and transformed to create several items like rods, seals, plastic tubing, adhesive tape and plastic sheets by using equipments like plastic extruders.
A few of the mostly used plastic items in plastic extrusion are nylon, polycarbonate, acetal, polyethylene, ABS or acrylonitrile butadiene styrene and acrylic.
What are the types of plastic extrusion?
1. Blown film extrusion
This technique is used when you want to manufacture plastic films to create shopping bags and objects like that. It's usually like a normal extrusion except for the die. In this method, the die used is like an upright cylinder that has a circular opening that can be as small as a couple of centimeters in diameter to as big as minimum 3 meters. One benefit of this process is the quality variations it can offer.
2. Sheet or film extrusion
In this method, the materials are cooled by pulling them through a series of cooling rolls. They are also able to achieve the desired surface texture and sheet thickness via this process. A method that follows this specific extrusion method is often known as thermoforming, in which a sheet is exposed to heat until it turns into soft plastic so that you can mold it into any shape. But, if you are going to use vacuum when doing this, the method is referred to as vacuum forming.
3. Tubing extrusion
In this method, plastic extruders are used to create tubes such as medical tubing and drinking straws. It's also like regular extrusion except for the die. In this case, a mandrel or pin is used to extrude hollow sections. You can use one or several die depending on the number of lumens or holes required.
4. Compound extrusion
This method uses one or a mixture of few polymers to make plastic compounds. You may use powder, liquid or pellets as feeds for injection molding and extrusion. Machinery are extremely helpful if you decide to use this process. You may get those little laboratory machines or those large extruders found in big industries.
Those are just 4 of the many extrusion processes known nowadays. They have evolved and improved over time. Each of them has its own pros and cons over the others. Each also needs different sorts of instruments.
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