How should the extrusion blow molding process for PC water bottles be controlled?

How should the extrusion blow molding process for PC water bottles be controlled?

① Extruded blow-molded PC water bottles, as shown in the figure below. The PC resin must be dried prior to molding processing, with moisture content reduced to below 0.02%, at a drying temperature of 120°C. Once dried, the resin must be used within 20 minutes; otherwise, it must be re-dried. 
② When extruding and blow molding PC resin, the barrel temperature must be strictly controlled, with the melt temperature difference maintained within ±3°C. Typically, the extruder barrel temperatures are set as follows: 40°C at the feed zone, 265°C in zone 1, 275°C in zone 2, 275°C in zone 3, and 250°C at the die adapter. The die temperatures are controlled at 250°C for both zone 1 and zone 2 of the die. 
③ During extrusion blow molding of PC resin, the mold temperature is generally controlled between 65–80°C and must be zonally regulated: typically 80–83°C at the bottom, 70–80°C in the middle, and 60°C at the top. For high-gloss molds producing products with high surface luster, a higher mold temperature is required. 
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