Blow molding machines</strong> are used to create hollow plastic objects in large quantities such as bottles jars, and other containers. The process involves a hollow mass of plastic, called a parison, which is heated, inflated to fill a mold, then cooled and ejected. Variations on the blow molding process can be done by extrusion of the parison, or injection of the plastic directly into the mold. The type of process used is determined by several factors: the type of container and its required strength and clarity, the desired production volume, the size of the finished product, and the type of plastic being