Various Processes Of Extrusion: It's Applications, Positive & Negative Sides And Various Tools & Machines Used

The process of extrusion has a lot of types, and one of them is generally known as plastic extrusion. In this method, raw plastic is used and transformed to produce several things such as rods, seals, plastic tubing, adhesive tape and plastic sheets by using tools like plastic extruders.

Some of the mostly used plastic materials in plastic extrusion are nylon, polycarbonate, acetal, polyethylene, ABS or acrylonitrile butadiene styrene and acrylic.

What are the forms of plastic extrusion?

1. Blown film extrusion

This technique is used when you want to manufacture plastic films to make shopping bags and objects similar to that. It is generally like a regular extrusion except for the die. In this method, the die used is like an upright cylinder which has a round opening that can be as small as a couple of centimeters in diameter to as large as at least three meters. One advantage of this process is the quality variations it can provide.

2. Sheet or film extrusion

In this method, the materials are cooled by pulling them through a number of cooling rolls. They're also able to achieve the preferred surface texture and sheet thickness via this method. A process that follows this particular extrusion method is generally known as thermoforming, in which a sheet is exposed to heat until it turns into soft plastic so you can mold it into any shape. But, if you're going to use vacuum when doing this, the technique is known as vacuum forming.

3. Tubing extrusion

In this process, plastic extruders are used to create tubes like medical tubing and drinking straws. It's also similar to usual extrusion except for the die. In this instance, a mandrel or pin is used to extrude hollow areas. You can use one or several die based on the number of lumens or holes necessary.

4. Compound extrusion

This process uses one or a combination of few polymers to create plastic compounds. You may use powder, liquid or pellets as feeds for injection molding & extrusion. Machinery are very helpful if you choose to use this method. You may get those small laboratory machines or those huge extruders found in big industries.

Those are just four of the many extrusion processes known today. They've advanced and enhanced over the years. Each of them has its own advantages and disadvantages over the others. Each also requires different sorts of machines.

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