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Compared with other hollow plastic products, the plastic medicine bottle molding equipment has small specifications, fast speed, high precision and high efficiency. The three stations can operate at the same time, with high production efficiency and short cycle, and the automatic counting and packing of all heat flow channel equipment can be realized, so the production efficiency is lower than 3 stations. At present, China has introduced more than 40 production lines of hot runner injection and blow molding medicine bottles from abroad, with a total production capacity of about 700 million per year. Relatively smooth, good sealing, fast variety development, mold capability and lower asset prices is "two steps" model of the upper hand, but because of an injection tube billet and blow molding for step by step, the product uniformity is poor,) to complete the molding; Step 2: put the tube blank on the honeycomb heater or the automatic cycle heating conveyor belt to heat up and adjust the temperature, and then move to the bottle blowing process to stretch and blow molding with compressed air. Extrusion blow molding can be complex shape, irregular shape and for the whole production of bending and environment and other strain of higher function, with better use function. Is the main difference between them: "three points" refers to an injection type billet and heated parison on a process, and "4 station" is refers to the parison plastic injection and molding products mold release can be continuous in the unified device for efficient equipment. Because the blow mold is only made up of the female die, it can be changed by simply adjusting the clearance of the die head or the precondition of extrusion.