The plastic bottle molding machine is mainly used for blowing PET plastic materials. It is completed by a series of actions such as feeding, heating, conveying, stretching, and clamping. In this process, the PET chains are bidirectionally extended, oriented and aligned, thereby increasing the mechanical properties of the bottle wall, improving tensile, tensile, and impact strength, and having excellent air tightness.
Although stretching helps to increase strength, it should not be overstretched, and the stretch-to-blow ratio should be controlled. Blowing is carried out between the glass transition temperature and the crystallization temperature, usually controlled between 90 and 120 degrees. In this range, PET exhibits a high elastic state, and it becomes a transparent bottle after being rapidly blown, cooled and shaped.
In the blow molding process, there are: stretching—one blow—second blow. The three actions are very short, but they must be well coordinated, especially the first two steps determine the overall distribution of the material and the quality of the blowing. Therefore, it is necessary to adjust well: stretching start timing, stretching speed, pre-blowing start and end timing, pre-blowing pressure, pre-blowing flow, etc. If possible, it is best to control the overall temperature distribution of the preform, and the internal temperature of the preform should be controlled. The temperature gradient of the outer wall.
In the process of rapid blow molding and cooling, 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 Bottle Blowing Mmachine Features
The drying tunnel and the blowing platform are separated, which reduces the mold opening time, improves the blowing efficiency, and increases the output at the same time.
1. The compact 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 running 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 a milky white or light yellow, highly crystalline polymer with a smooth and shiny appearance. It has excellent physical machine performance 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, and the creep resistance, fatigue resistance, friction resistance and dimensional standardization are all good.
What should we do if the bottom of the bottle is concave during the blowing process?
In the process of blowing the bottle, if the parameters are not set properly, the blown bottle will have various problems. The most common one is the depression of the bottom of the bottle of the Bottle Blowing Machine. Now I will share with you the analysis and solution of the depression of the bottle blowing machine. .
Common causes of dents on the bottom of the bottle are as follows:
1. The bottom of the bottle is insufficient
Solution: reduce the heating temperature of the bottom of the bottle
In the process of blowing the bottle, if the parameters are not set properly, the blown bottle will have various problems. The most common one is the depression of the bottom of the bottle of the bottle blowing machine. Now I will share with you the analysis and solution of the depression of the bottle blowing machine. .
Common causes of dents on the bottom of the bottle are as follows:
1. The bottom of the bottle is insufficient
Solution: reduce the heating temperature of the bottom of the bottle
