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Working principle and characteristics of PET one-step blow molding machine

by:Yosion Machinery     2021-07-11
PET blow molding machine is mainly used for PET plastic blow molding. It is completed by a series of actions such as feeding, heating, conveying, stretching, and clamping. The one-step pet blow molding machine blow molding process is a two-way stretch process In this process, the PET chain is bidirectionally extended, oriented and arranged, thereby increasing the mechanical properties of the bottle wall, improving the tensile, tensile, and impact strength, and has excellent air tightness. Although stretching helps to increase the strength, it should not be overstretched, and the stretch-inflation ratio should be controlled well. Blowing is carried out between the glass transition temperature and the crystallization temperature, usually between 90 and 120 degrees. In this interval, the PET exhibits a highly elastic state, and becomes a transparent bottle after rapid blow molding, cooling and setting.  Blow molding process includes: stretch-blow once-blow twice. The three actions are short, but they must be well coordinated, especially the first two steps determine the overall distribution of the material and the quality of the blown bottle. Therefore, it is necessary to adjust: stretch start timing, stretch speed, pre-blowing start and end timing, pre-blowing pressure, pre-blowing air flow, etc., if possible, it is best to control the overall temperature distribution of the preform, inside the preform The temperature gradient of the outer wall. In the rapid blowing and cooling process, induced stress occurs in the bottle wall. For inflatable beverage bottles, it can resist internal pressure and has advantages, but for PET bottle blowing machines, it is necessary to ensure that it is fully released above the glass transition temperature.  Pet blowing machine features  The drying tunnel is separated from the blowing platform, which reduces the time of mold opening, improves the blowing efficiency, and increases the output at the same time.   1. The compact exterior design reduces space, reduces production costs, and enhances competitiveness.   2. Automatic operation system.   3. Advanced control system, simple and convenient control panel.   4. Independent and simple linear operation system.   5. Unique heating system, precise temperature control and easy adjustment.   6. Unique storage device.  7. The cooling system of the PET blow molding machine can achieve the ideal cooling effect.  PET raw material characteristics:   PET raw material is milky white or light yellow, highly crystalline polymer, smooth and shiny in appearance. It has excellent physical machine functions in a wide temperature range, and the long-term use temperature can reach 120°C. The electrical insulation is relatively good, and the motor can still work normally under high temperature and high frequency, but the corona resistance is poor, creep resistance, fatigue resistance, friction resistance, and dimensional standards are all very good. Summary: The above is the working principle and characteristics of pet one-step blow molding machine, which can only be used by large enterprises at present. Small and medium-sized enterprises generally use two-step linear automatic pet blow molding machine, like Henan Jinyi blow molding machine to produce pet blow molding machine. Bottle machine with high output and stable performance, one output is two automatic pet blowing machine with stable output of 2500 bottles/hour, one output is four automatic blowing machine with stable 4500 bottles/hour, one output is six automatic blowing machine with stable 9000 bottles /Hour, one out of eight automatic pet blowing machine stable 12000 bottles/hour.
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