What is the purpose of an injection molding machine


What is injection molding? What is the purpose of an in […]

What is injection molding?

What is the purpose of an injection molding machine? Injection molding is a manufacturing process that is commonly used to make items ranging from plastic jewelry and toys to body parts, cell phone cases, water bottles and containers. Basically, many of the plastic parts we use every day are injection molded. It is a quick process to produce a mass of identical plastic parts. The flexibility in shape and size that can be achieved through the use of injection molding has constantly extended the limits of design in plastics and, due to freedom of design and low weight, has made alternatives possible. substantial to conventional materials.


The larger the MFI, the higher the tonnage required. Suppose you have a 4-cavity shape and each piece is a 5 "x 5" x 0.2 "square. You must first calculate the projected area of ​​the piece. With this shape, the calculation would be 5 "x 5" = 25 Square inches x 4 cavities = 100 square inches of projected area. The calculation of the projected area is necessary because this is the main variable that affects the base tonnage. If we were using a 10 MFI polypropylene, we would normally use at least 2.5 tonnes projected per square inch. For this shape, the projected area of ​​100 square inches requires an injection molding machine at least 250 tonnes in size.

Another factor when sizing the right machine is the size of the shot and the dimensions of the mold.


The main function of the clamping unit is to close and open the mold and eject the parts. Two of the most common types of pliers are rocker pliers and hydraulic pliers. The tilt clamps are crossed by hydraulic cylinders. These clamps use mechanical connections to generate greater forces than a hydraulic cylinder of the same size which uses a direct connection.


There are many other basics and fundamentals of injection molding science and technology, which we could discuss in a later blog. It should be noted, however, that while the basics of injection molding remain somewhat constant, the more technology we introduce into existing clamping and injection molding processes, the more complex the considerations when developing a mold or of the construction of an injection molding machine.