Why does the automatic blow molding machine leak air?
The blow molding process of the automatic bottle blowing machine is a biaxial stretching process. During this process, the PET chains are bidirectionally extended, oriented and sorted, thereby increasing the mechanical properties of the bottle wall and improving the stretching, tensile and impact resistance. strength and good air tightness. Although stretching helps to improve strength, it should not be stretched too much, and stretching should be controlled. Blowing is carried out between the glass transition temperature and the crystallization temperature, and it is usually controlled between 90 and 120 degrees. In this range, PET is expressed as a high elastic state, and it becomes a transparent bottle after rapid blow molding and cooling. What should I do if I encounter air leakage from the seal during use? Here are a variety of reasons: 1. Is the pressure of the seal cylinder enough? If the low-pressure seal cylinder is selected, the low-pressure pressure can be kept below 8 kg, and there is no problem with ordinary water bottles. But it also depends on the high-pressure blowing pressure. If the high-pressure blowing pressure is too large, the sealing cylinder will be pressed down. If the high-pressure pressure is reduced, it can also be blown into a bottle shape. Try to reduce the high-pressure pressure, or if the high-pressure pressure is too large, the clamping pressure will be reduced. If it is too small, the mold will be opened, and it will also cause air leakage in the seal, which can increase the automatic mold clamping pressure. 2. Whether the sealant is damaged or aligned with the seal, if it deviates from the seal, it will leak. 3. Whether the cylinder block or seal of the sealing cylinder is damaged. If the sealing member is damaged, it can be directly reflected. Open the solenoid valve of the sealing cylinder to know. 4. Whether the solenoid valve of the sealing cylinder is leaking or stuck or the exhaust is not smooth, these are also the reasons that affect the leakage of the sealing cylinder. Usually, the automatic blow molding machine can be maintained frequently, and there will be fewer air leakage faults. It is necessary to frequently check whether the lubrication of the central lubrication system to each moving element is sufficient, and check whether the safety gate limit switch is in good condition and triggers normally. If it cannot be turned on, check whether the on-off valve of the main oil circuit and the feedback input of the spool are triggered normally.
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