Then, a batch of preforms could be loaded into another machine called a reheat blow, or RHB, machine, which is designed for blowing preforms into bottles in high quantities and faster production rates with the potential to lower piece cost.įor more information on which process is right for you, please contact one of our Packaging Specialists. Preforms can be produced by one machine and then warehoused for later production. In the two-stage process the three stages of molding are split into two machines that work independently allowing more efficient throughput and flexibility. This technique is often used in applications that call for more rigid quality specifications or specialized shapes such as wide mouth jar openings. Each station takes the same amount of time since it is all part of one continuous process, on one machine. And finally, at the third station, air is blown inside the heated preform stretching the plastic into the mold and your desired bottle shape. It is switched to the second station for conditioning. This process is split into three stations: first melted plastic is injected into the preform mold. In the single stage process, preforms are created and then blown into bottles in one continuous process, by one machine. This polymer has a monomer formula mass of C 10 H 8 O 4, a melting point of 260 o C, and a specific heat of 1.0 kJ/ (kg-K). The polymer in our baby soda bottle preforms is polyethylene terephthalate, commonly known as PET. Interior volume of preform is approximately 25 cc (0.84 fluid oz). There are two types of stretch blow molding techniques: single stage and the two-stage process. Preforms are 11 cm long x 2.5 cm in diameter (4.3' x 1'). By injecting air into this heated preform, the bottle shape is formed to the desired mold shape. These preforms are the starting point for the plastic bottles. Then they are injected into a steel mold that shapes them into plastic tubes. Small pellets of plastic resin are pushed into an extruder and get melted. Stretch blow molding is a manufacturing process used to create PET plastic bottles and jars. Stretch Blow Mold Bottle Construction (Single stage/dual stage)
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