China Pet Bottle Not To Be Missed

Drying Pet Preform is the key to success: Pay close attention to, maintain good, and follow the recommendations of dryer manufacturers and resin suppliers. In the preforming process, the best conditions are: at the lowest possible temperature, in the shortest possible time, fast, uniform, complete melting, the maximum holding amount IV decreases slightly, as little as possible to produce AA, as much as possible Transparent. The relevant conditions are: temperature The molding temperature is the barrel temperature and the hot runner temperature. During the molding process, only 30% of the heat is from external heating and 70% is from internal frictional heat, so in addition to proper heating, it also has good shear heat. Injection and packaging The injection overcomes the flow path resistance and will melt fill into the mold. When preforming, the best three speeds and pressures are arranged in descending order. The injection rate is too slow, the cutting is not enough, and the product produced is not completely or short-shot before it is completely cooled; the exhaust chamber is faster and less, resulting in unsatisfactory charge, shrinkage, and high AA. Fillers have two important functions: preventing melt reflow and cooling under pressure to ensure (enhanced cooling). Too much will cause the mold to overfill and swell, the internal stress will be higher, and it may crystallize. Too low will cause shrinkage, bottle deformation (not enough cooling), gate problems such as pinholes, bubbles, etc. Because the cooling rate is reduced at the gate. The residence time should be appropriate, too short to cause pinholes, stretching, etc. Press release The pressure relief is to reduce the pressure inside the hot runner and prevent the gate of the needle valve from being inflexible. However, too much can cause shrinkage, stretching, and pinholes. Back pressure The back pressure is driven by the rotation of the screw in the hydraulic system, and the screw exerts a pressing force on the melt in the oil. Role: Strengthen PET plastics to eliminate air bubbles. It is possible to transfer only the machine, and with the other preforms, after the back pressure is slowly increased, it is a suitable back pressure to be added to the preform without bubbles or scars. The high shearing effect is too strong, and problems such as poor shape, clogging of the gate, and pyrolysis may occur. If you want to find a reliable China Pet Bottle manufacturer, then don't miss the Jilian mold, we have a wealth of production experience in this area, is a choice you should not miss.