Information On Plastic Injection Molding
It’s always important to know the ins and outs of every difficult process right? To me mostly yes, but the other day my friend was talking about what he learned about in his college class, something by the name of polymer injection molding. Interested to learn more on a college worthy topic I listened to his brief description. I was fascinated by how many simple things can be made out of plastic, things I never took a second to think was plastic! I learned that Plastic extrusion is a manufacturing process when plastic is put into a large heater, melted, shaped, and cut to length. As I was eager to learn a little more I did some research and asked a couple people their knowledge on plastic extrusion. The results were a lot of people had mixed reactions on knowing what it was or not!
I found it interesting how my use of adhesive tape everyday must be the product of plastic extrusion or simple things such as window frames. AS the process begins, small beads of plastic are fed into a heated extruder cavity or cylinder.
In the plastic extrusion process small bead forms of plastic are fed into a heater extruder cavity or cylinder. In some cases ultra violet inhibitors may be added to the raw plastic beads as well. Once inside the heater the small beads enter the extruder cavity towards a screw mechanism. The screw rotates forcing the plastic material through the extruder.
This was an interesting fact; inside the heater is a whopping 400 degrees F, due to the heater having to be the same temperature of the plastic materials melting point. Over heating is a big issue in plastic extrusion and there’s one way to make it stop!
Many plastic extrusion processes involve three different heaters, set to gradually increase heat inside the cavity. That will overall make overheating not an issue. It is also very interesting how so much friction and pressure builds up inside the heater that sometimes the heater will be shut off. So, so much heat is being produces on its own.
The die it is placed into is responsible for the plastics profile, after the die the plastic must be cooled. It’s cooled by a sealed water bath; the water bath protects the newly formed product in its still molten state. If the plastic was being formed into a sheet a specially designed cooling roll replaces the water bath.
This process is also called the Polymer Extrusion Process. The program I intensely payed attention too showed every aspect I was willing to learn about this process. After the cooling is complete, it’s time for the plastic to be cut to size. The product can also be spooled, coiled, or cut to length. Materials such as Aluminum and rubber are examples of extruded parts of the plastic.
The extrusion process is used every day for household items, city structures, and simple things as tape. But no one realizes that hurricane panels are made from extruding plastic. After everything is cooled, it is now time for the plastic to coiled or cut to length.
I was just overwhelmed with the many parts of plastic extrusion and the products I never thought would come from it. I’m sure going to check out if any there is any polymer extrusion companies in my area in case I’m in need of some adhesive tape! Overall I’m glad I know the process on how most plastic products are made.
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