Glass Bottle Manufacturing Process

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Injection molding preforms and bottle blow-up ratio of the value of
Small volume injection blow molding of PET bottles, in the process of molding process, the parison occurs mainly axial tension. The smaller axial tension, the greater the blow ratio (ratio refers to the diameter of the bottle and the parison diameter), the possibility of uneven thickness distribution of the bottle greater, could easily lead to the shoulder and the bottle or bottle bottle and the bottle the bottom curved areas of uneven thickness transition region. Small flask body blow ratio generally take between 1.5 to 1.8. On the cross-section of the bottle oval, if it is less than the ratio of the length that is oval ellipse minor axis ratio 1.5: 1, may be circular in cross section forming a parison. Elliptic is no more than 2: 1, can be circular in cross section and oval mandrel parison molding. Ellipse ratio greater than 2: 1, the general requirements mandrel and parison cavity are designed into an oval. Ellipse ratio increases, the difficulty of the parison mold design and manufacturing costs were increased, generally should not exceed 3: 1.
4, injection molding parison mouth and neck size
Parison mouth diameter and thread size bottle size should thread of unity, and to match the thread size caps. In this regard due to the current absence of a unified national standard, 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.