高分子材料加工技术专业英语 Extrusion Blow Molding of 200ML HDPE Bottles 挤出吹塑成型示例.docxVIP

PAGE 聚苯乙烯泡沫塑料板 Left: The CBF process starts with upward extrusion of a “dose”. Right: The dose is sliced off by a rotating tool and deposited in a compression molding cavity on another wheel. CBF machines combine elements of compression moulding and blow moulding in a continuous rotary process. CBF uses an integrated in-line sequence that does not require station-to-station transfer. Material is extruded, cut and transferred into a compression cavity. A preform is produced, and bottles are then pre-blown before the blow mould cavity closes over the preform. Then, the mould cavity closes and the bottle is blown. Left: After compression moulding, the preform is immediately pre-blown to release it from the cavity/core and ensure uniform material distribution. Right: Final blowing occurs in the same mold station as the previous two steps, with no transfer of the preform. Stretching can be added. Instead of using a manifold for melt distribution, an extruded shot of resin is transferred directly into the compression mould, giving producers more control over the quality of the container. Eliminating a manifold also eliminates differences in temperature, so there’s less chance of particulate contamination, resin burning, and other defects, like the black specks seen with injection blow moulding Each bottle is leak tested before leaving the machine. Left: The next step in the three-stage, in-machine QC system is an IR camera system that checks for dimensional varitiations and contamination on or in the bottle wall. Right: The final in-machine QC step is an atmospheric plasma treatment system that ensures adhesion of full-wrap labels and induction cap seals. The technology is said to offer more uniform weight distribution, as the weight of each resin shot is controlled with a servo-controlled melt pump.The pre-blow process allows a more consistent and uniform wall thickness by making it easier to separate plastic from the compression core. The blow process begins immedi