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# what are you looking for？
a technical problem solver ？！
Hello everyone, I’m Vivian，I am the Overseas Manager of Zhongshan Jindong Machinery Co., Ltd. and the founder of www.ibottler.com. With my extensive experience in the field of plastic bottle machinery and molds, my ultimate mission is to simplify the complexity of blow molding and enhance the reputation of “Made in China” products on the world stage.
My journey began with a degree in Business Administration, which shaped my approach to problem solving and strategic planning. Although English is not my first language, my expertise in blow molding machines transcends language barriers.
At heart, I am a dedicated professional who takes great pride in helping others – both clients and others. I often find myself helping others solve various blow molding machine problems, drawing from my extensive experience.
In addition to managing the operations of Zhongshan Jindong Machinery, I am actively involved in the research and development of more automated and higher-yield blow molding machines. I firmly believe that automation has the potential to revolutionize this industry.
On this platform, I will share my challenges, successes, and lessons learned in the plastic bottle production process. If you are facing the same dilemma, I hope that the experience I share can provide you with guidance and solutions.
If you have any questions, you can contact me. I hope I can help you solve some problems with my expertise.
Solutions to common problems
- Combined with the actual situation
PET bottles have uneven thickness？
Cause analysis:
– Uneven heating lamps.
– Improper pre-blowing pressure setting.
– Insufficient mold cooling.
Solution:
– Check whether the position and power of the heating lamps are consistent to ensure that the preforms are heated evenly.
– Adjust the pre-blowing pressure to avoid deformation of the bottle body.
– Increase the mold cooling water flow rate or reduce the water temperature to ensure uniform cooling of the mold surface.
Bottle burst or deformation？
Cause analysis:
– Too high or too low blowing pressure.
– Unstable quality of raw materials (PET particles).
– Defective mold design.
Solution:
– Adjust the blowing pressure to keep it within a reasonable range.
– Replace stable and high-quality PET raw materials.
– Optimize the mold structure and eliminate design flaws.
Low production efficiency of the blow molding machine？
Cause analysis:
– The heating time of the blow molding machine is too long.
– Low degree of automation, more manual operations.
– Inconvenient mold replacement.
Solution:
– Regularly maintain the heating device to optimize the heating efficiency.
– Upgrade automation equipment, such as using automatic bottle picking or automatic loading and unloading devices.
– Improve mold design and use technology for rapid mold replacement.
Poor preform molding？
Cause analysis:
– The quality of the preform does not meet the standard.
– The design of the injection mold is unreasonable.
– Improper setting of injection molding parameters.
Solution:
– Use high-quality preforms to ensure the stability of raw materials.
– Optimize the design of the injection mold to avoid eccentricity or uneven thickness of the preform.
– Adjust injection molding process parameters, such as temperature, injection molding speed, etc.
Abnormal noise during equipment operation？
Cause analysis:
– Insufficient equipment lubrication or serious wear of parts.
– Cylinder or valve aging and leaking.
Solution:
– Regularly check the equipment and add lubricating oil, and replace worn parts in time.
– Repair the air circuit system and replace aging cylinders and valves.
Scratches or flaws on the bottle surface？
Cause analysis:
– Uneven friction between the preform and the mold.
– The inner wall of the mold is not smooth.
Solution:
– Check the mold surface, polish the inner wall, and reduce friction.
– Optimize the fit between the preform and the mold.
The bottle mouth size is not standard and cannot match the bottle cap？
Cause analysis:
– The bottle blowing mold is not calibrated.
– Unreasonable heating distribution causes bottle mouth shrinkage.
Solution:
– Accurately calibrate the blow molding mold to ensure that the bottle mouth size meets the standard.
– Adjust the temperature and position of the heating lamp in the bottle mouth area.
Frequent equipment shutdowns during production？
Cause analysis:
– The electrical system is unstable or the air pressure is insufficient.
– Frequent failures caused by long-term lack of equipment maintenance.
Solution:
– Regularly check and maintain the electrical system to ensure a stable air source.
– Develop an equipment maintenance plan to prevent possible problems in advance.
PET bottles have poor transparency or bubbles？
Cause analysis:
– The moisture content of PET raw materials is too high.
– The heating temperature is too low or the time is insufficient.
Solution:
– Use a dryer to fully dry the PET raw materials to ensure that the moisture content is less than 0.005%.
– Increase the heating temperature or extend the heating time to ensure that the preform is fully softened.
The finished bottle has a serious odor？
Cause analysis:
– The PET raw material is of poor quality and contains impurities.
– The temperature is too high during the heating process, causing the raw material to decompose.
Solution:
– Choose high-quality PET raw materials that meet food grade standards.
– Control the heating temperature to avoid the raw material from decomposing at high temperatures.
Reason:
1. The blowing time is too early 2. The stretching rod has not been lowered to the bottom 3. The stretching rod deviates 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. Uneven heating
Elimination method:
1. Delay the blowing time or increase the descending speed of the stretching rod 2. Adjust the position of the magnetic pole switch 3. Adjust the position of the stretching rod 4. Improve the quality of the embryo tube 5. Improve the heating conditions, or check whether there is any problem with the rotation of the preform.
Reason:
1. Holding pressure too high
2. Bottom film gate hole eccentric
Elimination method:
1. reduce stress
2. Correction mold
Reason:
1. The position of the stretching rod is not in the center of the preform 2. The blowing holes are asymmetrical and have different hole diameters. 3. The stretching ratio is too low or the blowing ratio is too small. 4. The embryo tube does not rotate in the heating furnace. 5. The embryonic tube wall thickness is not good. Injection density is uniform or uneven
Elimination method:
1. Adjust the position of the stretching rod 2. Adjust the position and diameter of the blowing hole 3. Increase the stretching or inflation ratio 4. Check the rotating device 5. Improve the quality of the preform.
Reason:
1. The temperature of the upper part is too low 2. The vent 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 stretching rod speed is too slow
Elimination method:
1. Heating the upper part 2. Adjust the position of the exhaust hole 3. Increase the stretching ratio 4. Change the bottle shape 5. Adjust stretch rod speed.
Reason:
1. The blowing time is too early 2. The stretching rod has not been lowered to the bottom 3. The stretching rod deviates 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. Uneven heating
Elimination method:
1. Delay the blowing time or increase the descending speed of the stretching rod 2. Adjust the position of the magnetic pole switch 3. Adjust the position of the stretching rod 4. Improve the quality of the embryo tube 5. Improve the heating conditions, or check whether there is any problem with the rotation of the preform.
Reason:
1. The delayed air 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
Elimination method:
1. Extend the delayed air blowing time or increase the descending speed of the stretch rod 2. Extend the delayed mold opening time 3. Cool down 4. Clean the exhaust valve with gasoline.
Hey!
I am Vivian,
I would like to remind you that when using PET bottle blowing equipment, daily maintenance is the key to keeping the equipment running efficiently. Here are some simple but practical daily maintenance suggestions for you, hoping to help you manage the equipment better
Clean Equipment Regularly
Remove dust and debris from the machine daily, focusing on key areas like heating systems and air filters. This prevents blockages, reduces wear, and maintains smooth operation.
Inspect Air Systems
Check air pipelines and valves regularly for leaks or blockages. Maintain stable pressure levels to ensure efficient operation and consistent product quality.
Lubricate Moving Parts
Apply lubricant to bearings, gears, and guides every week. Proper lubrication can minimize wear, reduce energy consumption, and extend the life of the equipment.
Knowledge Discussion Forum
- Common Questions About Blow Molding Machines and Molds
