Diving into the realm of plastic product creation, an in-depth analysis of the differences and comparative aspects between Blow Molding and Injection Molding is provided, as discussed in the article “Blow Molding vs. Injection Molding: Differences and Comparison” on Xometry.
Blow molding, a technique to manufacture hollow plastic products like bottles and containers, traces its roots back to the inventive minds of Enoch Ferngren and William Kopitke in 1938. Initially inspired by ancient glass-blowing techniques, the process evolved with the introduction of HDPE in the 1950s and PET in the 1970s, leading to improved performance characteristics.
Blow molding machines extrude a softened plastic tube called a parison, which is then shaped by pressurized air within a mold. The excess material is trimmed and recycled back into the process. This method is preferred for parts with thin walls, such as bottles, fuel tanks, and consumer product casings, where injection molding faces limitations.
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