ABSTRACT
Production levels soared, blow molding machines began utilizing multiple blowing stations, and wheels became more dominant for large volume production requirements. The immediate success of plastic blow molded bottles led to almost daily improvements to in deflashing and neck finish trimming. The term in-line trimming depicts the entire trimming process incorporated within the blow mold versus downstream conveyor equipment. Spin trimming is also utilized whereby the blown moil is removed by rotating the blown bottle on counterrotating belts and a correctly positioned razor knife cuts off the moil like a can opener. Trimming of each product requires the proper pinch-off design, quality mold design and construction, correct speeds of knives, drills, and guillotines, all matched to the specific plastic material used in the blow molded product. Reaming of the finish caused angel hair and chips to dislodge and fall inside the container, necessitating that a vacuum be applied to remove them.
