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So according to the bottle contents were to determine the size of the bottle portion. Parison neck size determine when the blow mold cavity dimensions and should be considered contraction after molding bottles, PET bottle blow air pressure inside the parison is 1.2MPa, the use of 5 ~ 10 ℃ cooling water cooling blow mold, the parison after blow to the rapid cooling. 5, bottle injection blow molding mandrel features
Injection blow molding mandrel function used mainly in five areas: (1) determine the shape of the inner diameter of the bottle neck forming the parison (2) in mechanical indexing process to take away the parison or bottle; ( 3) a mandrel provided with airway with air entrances, delivery of compressed air to inflate the parison; (4) inside the mandrel can pass circulating liquid or air, in order to adjust the temperature of the parison; (5) at the rear near the mandrel with 0.10 mm deep open side of the groove, so that the ends of the parison wedging groove, avoid blow station go to the parison forming station from the process, the parison its elastic shrinking lead to neck screw dislocation. Seal grooves play a role in reducing leakage during blow compressed air. 6, choose the value of length to diameter mandrel
Length and diameter of the mandrel is mainly determined by the parison, the mandrel diameter than the inner diameter of the bottle neck smaller, easy to release the bottle. But mandrel diameter should take large values ??as much as possible within the scope of the bottleneck inner diameter in order to avoid excessive blow-up ratio. Coaxial mandrel diameter should be within 0.05 to 0.08 mm. Bottle parts mandrel diameter is the outer diameter of the bottle and the bottle on the thickness, the range is usually dark green bottle bottle rod diameter equal to the outer diameter minus twice the wall thickness of the bottle.

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