What is plastic extrusion and how does it work?

Plastic is one of the best things man has ever invented and made to use. It is cheap to manufacture, lightweight, and strong. For these reasons, plastic has a wide range of uses and can be manufactured in interesting ways. One of these uses is called “plastic extrusion”.
 
This plastic extrusion process has been around for a long time. It has many steps, such as preparing the material, pre-treatment, cutting and extruding. In this article, we will take an in-depth look at the plastic extrusion process and how it works.

What Is Plastic Extrusion?

Plastic extrusion is a versatile manufacturing process that shapes plastic raw materials into continuous profiles with a uniform cross-section.This process is used to make a wide variety of plastic products, including pipes, fittings, plates, rods, and a variety of other profiles used in the construction, packaging, and automotive industries.
 
The plastic extrusion process begins by feeding plastic resins or pellets into a hopper where they are heated to a molten state. The molten plastic is then forced through a specially designed die that determines the shape and size of the final product. As the plastic exits the mold, it cools and solidifies rapidly, resulting in a contour of the desired continuous length.
 
The process can be modified to incorporate a variety of additives, colors, or reinforcements to achieve specific performance characteristics or visual appearance, making plastic extrusion an efficient and adaptable method of producing a wide range of plastic products. Let’s look at an extruder’s components to learn more about how plastics pass through an extruder.
plastic-extrusion-machines
  • Hopper:This is part of the extruder that holds the powdered, pelleted, or chopped material for the plastic extrusion process.
  • Feed-Throat:This part of the extruder connects the barrel to the hopper. In other words, it helps move the material from the bin to the barrel so that it can be used in the plastic extrusion process.
  • Breaker Plate:The breaker plate helps keep the pressure up. It also acts as a screen to keep things from getting into the barrel that shouldn’t be there.
  • Barrel:This part softens the plastic by applying heat, getting it close to its melting point. It also holds the rotating screw, which provides the pressure needed to force the plastic material down the feed pipe.
  • Feed pipe:The barrel is connected to the die by this pipe. In other words, it moves the molten plastic from the tube to the die.
  • Die:Here is the part where the mixed heated material leaves. The mold is usually made of metal and it serves to give the processed material a specified profile.
  • Cooling System:In this part, the processed plastic cools quickly, which helps it harden. 

How Does Plastic Extrusion Work?

Earlier we learned what the plastic extrusion process is. So, next, let’s learn more about how plastic extrusion machines work. This process is divided into four main steps.

plastic-extrusion-process

Step 1: Putting in the ingredients

The first step in the process of extruding plastic is to add additives to the plastic that will be used. Of course, it is not at all like CNC cutting. Depending on what needs to be made, the additives could be colorants or UV inhibitors.

Step 2: The material starts to melt

The next step in the process of making plastic from scratch is to put the plastic material into the hopper. It goes from the hopper to the barrel through the feed-throat. The barrel is like a melting pot because the temperature needs to be kept at just the right level.
 
Through a big spinning screw, the barrel also helps spread the plastic material used in the process in an even way. Plastic materials are transformed from a solid state to a molten state when subjected to high temperatures and rotation.

Step 3: Putting the shape together

As the spinning screw pushes the molten material out of the barrel, it goes through one or more screens at the barrel’s end. These screens do two important things at the same time.
 
First, it cleans the molten plastic by getting rid of any alien objects or other impurities. Second, it helps make sure that the pressure stays the same throughout the system by offering the same amount of force everywhere. So, when the liquid material goes through the screens, its temperature goes up a lot and it becomes easier to shape.
 
By pushing the melted plastic through the die, then you can get the shape you want. This means that the shape of the liquid plastic will be the same as the shape of the die.

Step 4: Let it cool down

Once the processed plastic material has passed through the mold, we need to cool it. We can use water troughs, cooling rolls, or a water shower for this purpose. The goal of cooling is to make sure that the shape of your extruder plastic profile doesn’t change.
 
In general, the plastic extrusion process helps to produce products with basic shapes. Examples of such plastic products are sheets, pipes, and other processed products that are used in everyday life. Of course, you can also use custom molds to produce plastic products with specific needs.

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Qingdao Plastic Extrusion Machines Ltd, is a professional plastic extruder manufacturer located in Jiaozhou Bay. Our company gathers the first-class technology in China and devotes to the research of new plastic machinery and the transformation of international high technology. 

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