Common faults and solutions of blow molding machines

The blow molding machine will often encounter faults during use, but don't panic, we just need to find the correct positioning and method, so in order to find a good solution, we must first know where the specific fault is. Next, let us Just take a look. Fault 1: The transparency of the PET bottle is poor. Reasons: 1. The heating temperature is too high. 2. The heating time is too long. 3. The compressed air contains water. 4. The injection molding embryo tube itself is opaque. 5. The embryo tube design is not suitable. Solution: 1. Cool down 2. Shorten the heating time of the blowing machine 3. Use a dryer to remove water 4. Improve the quality of the embryo tube, select the materials and improve the dryness of the raw material 5. Improve the size design of the embryo tube 6. Reduce the diameter of the embryo tube. Fault 2: The PET bottle appears pearly white. Reasons: 1. The heating temperature is too low. 2. The wall thickness of the embryo tube is uneven. 3. The thickness of the embryo tube is too thick. Thickness, or try to raise the cover of the heating device to increase the surface temperature of the embryo tube. Failure 3: The position of the nozzle at the bottom of the PET bottle is offset. Reasons: 1. The blowing time is too early; The extension rod is offset from the center line of the bottle axis; 4. The wall thickness of the embryo tube is uneven or the injection density is uneven; 5. The heating of the blow molding machine is uneven. Solution: 1. Delay the blowing time or increase the descending speed of the stretch rod. 2. Adjust the position of the magnetic pole switch. 3. Adjust the position of the stretch rod. 4. Improve the quality of the embryo tube. Fault 4: The wall thickness of the PET bottle is uneven. Reasons: 1. The position of the stretching rod is not in the center of the embryo tube. 2. The blowing holes are asymmetrical and the diameters are different. 3. The stretching ratio is too low or the inflation ratio is too small. 4. The embryo tube does not rotate in the heating furnace. 5. The embryo tube wall Solutions for uneven thickness or injection density: 1. Adjust the position of the stretching rod 2. Adjust the position and diameter of the blowing hole 3. Increase the stretching ratio or inflation ratio 4. Check the rotation device 5. Improve the quality of the embryo tube 5 : The upper part of the bottle is too thick. Reasons: 1. The temperature of the upper part is too low. 2. The exhaust hole of the mold is too far from the upper part. 3. The stretching ratio is too low. 4. The inflation ratio of the upper part of the bottle is too low. 5. The speed of the stretching rod is too slow. Solution: 1. Heat the upper part 2. Adjust the position of the vent hole of the blow molding machine 3. Increase the stretching ratio 4. Change the shape of the bottle 5. Adjust the speed of the stretching rod. Fault 6: The bottom of the bottle is too thin. Reasons: 1. The blowing time is too early 2. The bottom temperature is too high 3. The bottom of the embryo tube is too thin Solutions: 1. Delay the start of the blowing time 2. Reduce the bottom temperature 3. Increase the thickness of the bottom of the embryo tube Fault 7: Bottle mold clamping Lines are obvious. Reasons: 1. Insufficient mold clamping pressure 2. Too early sealing time 3. Mold problem 4. The size of the teeth of the embryo tube does not match the mold. Solution: 1. Increase the clamping pressure, adjust the angle of the clamping strut (<5 degrees) 2. Move the clamping stroke switch position backward 3. Repair the mold or check the assembly position of the mold, such as whether the guide post is loose, or Whether the mold is not pressed 4. Repair the mold mouth matching position. Fault 8: The bottom of the bottle or the neck of the bottle is rolled up, and the material is accumulated. Reasons: 1. Delayed blowing time is too long 2. One roll, one good 3. The temperature of the material accumulation is too low 4. The air pressure for action is unstable, which affects the descending speed of the stretching rod. Solution: 1. Shorten the blowing time of the delay blowing machine or reduce the descending speed of the stretching rod. 2. Reduce the air volume on one side of the bottle. 3. Increase the heating temperature of the embryo tube. 4. Add a gas storage tank to the action gas. source, or shorten the air supply line. Fault 9: The bottom of the bottle is stretched and perforated. 1. Insufficient temperature and no penetration 2. Delayed stretching time is too long 3. The stretching ratio is too large 4. The bottom of the embryo tube is too thin 5. The stretching rod head is too sharp. Solutions: 1. Warming 2. Shortening the delay stretching time 3. Reducing the stretching ratio 4. Improving the bottom design of the embryo tube 5. Rounding the stretching rod head failure 10: The bottom of the bottle is blasted. Reasons: 1. The delayed blowing time is too short. 2. The delayed mold opening time is too short. 3. The temperature is too high. 4. The exhaust valve does not work. Solution: 1. Extend the delayed blowing time or increase the descending speed of the stretching rod. 2. Extend the delayed mold opening time. 3. Cool down the blowing machine. 4. Clean the exhaust valve with gasoline. Fault 11: The bottom of the bottle is not full. Reasons: 1. The temperature at the bottom of the bottle is too high. 2. The vent holes at the bottom of the mold bottle are insufficient or uneven. 3. The stretch rod has not reached the bottom. 4. The design of the stretch rod head does not conform to the shape of the bottom of the embryo tube. 5. Insufficient blowing pressure. 6. Insufficient flow of air blowing valve. 7. The bottom curve of the bottle is poorly designed. Solution: 1. Lower the temperature at the bottom of the heating zone or use a damp cloth to lower the temperature at the bottom of the embryo tube. 2. Increase the number of vent holes and make them evenly distributed. 3. Adjust the stretching rod to the bottom of the bottle. 4. Replace the stretching rod head. 5. Increase the blowing pressure. 6. Clean the blow valve with gasoline. 7. Increase the streamlined design of the bottom curve of the bottle. After the blow molding machine equipment fails, you must first learn to solve it and find out the root cause, so that you can find a good method and way to deal with the problem, so you should pay special attention to it.
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