PET jar blowing machine is a type of blow molding machine specifically designed to produce PET (polyethylene terephthalate) jars. These machines use a two-step process that involves the production of preforms, which are then heated and blown into the final jar shape. 

PET jar blowing machines can be fully automated, with various features such as automatic loading of preforms, temperature control, and blow molding sequence. With the right automation, these machines can achieve high levels of efficiency and accuracy, helping to reduce labor costs and improve product consistency. PET jar blowing machines can produce a variety of jar designs, including different shapes, sizes, and capacities. The design depends on the specific application requirements, such as packaging for food, beverages, cosmetics, or pharmaceuticals.