The plastic injection process begins with the transfer of the molten plastic into the cavities of the plastic injection preform mould. A clamping system inside the mold helps the plastic to solidify during the cooling process. Additional melt is allowed to flow into the mold during the cooling process to compensate for any shrinkage that may occur during the molding process. After the required cooling time, the two halves of the mould are separated. The molded part is then ejected.
Propylene, a semi-crystalline thermoplastic, is a tough, elastic and fatigue-resistant material. It is also an excellent electrical insulator and is widely used in packaging materials, automotive parts, household and office items. Because of its low melt viscosity, it is easier to mold than other plastics.
The process of plastic injection molding is a very efficient way to produce large numbers of plastic products. It is ideal for parts that require high volume production because the process involves the injection of molten plastic into a mold and cooling it to its final form. A typical injection molding mold can produce thousands of parts before the tooling needs to be replaced. During the process of plastic injection molding, it is very important to maintain the proper parameters for the injection process to avoid defects.
Another important factor in the design process is the IM process. It is used to create the parison and precursor for a variety of applications. A rotary table, blowing station, and IM unit are necessary for the process. The hollow core pin is then placed in a larger mold and inflated into the shape desired.