How to get consistent outcomes with blow molding? makenica.com/how-to-get-consistent-outcomes-with-blow-molding
Everyday hollow plastic items such as milk cartons, shampoo tubes, storage drums, and watering cans are all made using a specific manufacturing process: blow molding. The adaptable method allows for the formation of thin-walled, hollow plastic containers by applying molten thermoplastic to a mold and shaping it as required by blowing compressed air inside. Polyethylene, polypropylene, polyethylene terephthalate (PET), and polyvinyl chloride (PVC) are popular plastics used in the method.
What is blow molding, and how does it function? Blow molding is a technique for creating and joining hollow plastic objects widely found in packaging and manufacturing applications, such as plastic ducting, tubs, and drums. The use of compressed air distinguishes the technique from regular injection molding services, which are most widely used to produce solid products. The blow molding procedure is carried out in stages, beginning with the formation of softened, molten plastic into a tube-like shape using an extruding machine, followed by the development of a hole in one end for the passage of compressed air. This hot plastic tube is referred to as a parison. The parison is then clamped into place in the mold, allowing compressed air to pressure the plastic outwards, creating the final, hollowed-out shape. When the part has hardened, it is removed from the mold and allowed to cool.
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