Change law of PET bottle blowing machine process parameters after adjustment
Change law of PET bottle blowing machine after adjustment of process parameters Temperature before preform heating (ambient temperature) 1. High temperature, small heating power, fast temperature rise, easy expansion of the thread 2. Low temperature, high heating power, slow temperature rise, Bottom cracks and cracks are prone to occur. Cooling air flow of the light box 1. The flow rate is large, the preform cooling transition, the temperature rise speed is slow, and it cannot meet the requirements of blowing. , whitish, the temperature of the double-layer bottle preform is heated 1. The bottle will produce high temperature crystallization with high temperature, and the color will be milky white. 2. If the temperature is low, the bottle will produce excessive stretching crystallization, and the color will be foggy and whitish. Bottom heating temperature 1 2. If the temperature is high, the thickness of the bottom of the bottle will be thin and the stress test time will be shorter. 2. If the temperature is low, the thickness of the bottom of the bottle will cause a split-bottom bottle. Pre-blowing position (relative to the position where the stretch rod touches the bottom of the preform) The bottom is thin, the thickness of the bottle foot is thin, it will be foggy and whitish seriously, the bottom weight is light, the injection point is eccentric , The thickness of the bottle foot is thin, it will be foggy white or even blow out, the bottom is light, the injection point is eccentric. The bottom of the bottle will be poorly cooled at 15°C. In severe cases, it will be convex, flat and not full, which is easy to generate stress and easy to burst in the drop test. 2. If the bottom mold is too low, condensation will occur, and there will be water marks on the bottom of the bottle. The capacity of the high bottle decreases 2. The capacity of the bottle is increased when the bottle is lowered. There are water marks on the bottle body when the bottle is opened. Pre-blowing flow 1. The flow rate is large. Eccentric 2. The flow rate is small, the bottom of the bottle is thick, the thickness of the bottle foot is thick, and the bottom material blowing machine is difficult to blow the exhaust position. 1. The cooling and crystallization in the front is not good, the temperature is high, the bottle is easy to shrink, and the capacity is small. 2. The capacity of the back bottle increases. Big
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