A PET jar blowing machine is used to produce plastic jars and bottles from PET (polyethylene terephthalate) using stretch blow molding technology. Here are some key details:- PET is one of the most common plastic materials used for beverage bottles and food jars due to its strength, transparency and recyclability.- The machine forms jars and bottles by injection molding PET preforms first and then stretch blow molding them into final shapes.- In the first stage, the PET resin is injection molded into test tube shaped preforms using a mold.- These preforms are then heated and loaded into blow molds where high pressure air is blown into them.- Rods stretch the heated preforms in the mold causing the PET to expand and take the shape of the mold cavity.- The blow pressure ranges from 25 bar for small bottles up to 40 bar for large containers.- The stretch blow molding enables production of bottles with wide necks and shoulders which are difficult by simple blow molding.- Multiple cavity molds allow high production outputs. Capacities can range from 1,000 - 100,000 bottles/hr.- A variety of jar and bottle shapes, sizes and designs can be produced including handles, curves and embossed surfaces.- Advanced systems have bottom blowing, vacuum degassing and closed-loop cooling technologies.- PET provides transparency, shatter resistance and good barrier properties for oxygen and carbon dioxide.In summary, PET jar blowing machines provide a high-speed, high-volume method for producing transparent and durable PET jars and bottles in different customized shapes and sizes.
