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In the plastic packaging industry, blow molding molds are the core equipment for PET preform production, and their performance and stability directly affect product quality and production efficiency. Foshan Heyan Mold Co., Ltd., as a leading enterprise in the field of bottle preform molds, not only focuses on the research and production of PET bottle preform molds, but also is committed to providing customers with comprehensive technical support and solutions. The following is a detailed analysis and solution provided by Foshan Heyan Technology for common problems with blow molding molds:
1, Transition issues
Phenomenon: The thickness of the bottle wall changes from thick to thin, such as from the shoulder to the middle, or from the bottom to the middle. When severe, the bottom is not fully formed and the contour of the petal bottom is not ideal, which affects the stability of the bottle.
Diagnosis: This problem is usually not caused by a single factor, it may be due to insufficient blowing, low preform temperature, or improper mold design. Foshan Heyan Mold suggests conducting inspections from the following aspects:
Check if the high-pressure filter on the side of the mold is unobstructed to ensure a stable supply of high-pressure air.
Check the working condition of the circuit valve to ensure accurate positioning during blowing.
Adjust the blowing airflow control component to ensure the set value is correct and there is no blockage inside.
Optimize blowing time to avoid additional cooling of PET material.
Ensure that all ventilation holes on the mold are unobstructed and maintain smooth airflow.
2, Bottle mouth swelling and gas leakage issues
Phenomenon: The screw area expands and swells, especially in hot weather, accompanied by a sound of air leakage.
Diagnosis: High temperature causes a decrease in the cooling effect of the oven, an increase in the temperature of the core rod, and subsequently affects the threaded area.
Solution for Foshan Heyan Mold:
Adjust the position of the cooling plate and strengthen the protection of the thread area of the preform.
Using external cooling technology to control the temperature of the threaded area and core rod when the preform passes through the oven.
Design more optimized cooling plates to improve cooling efficiency.
3, Neck bending problem
Phenomenon: During filling or sealing, the protruding ring under the thread of the bottle mouth is displaced and not perpendicular to the centerline of the bottle body.
Diagnosis: Improper mechanical operation, excessive accumulation of material in the neck leading to deformation after mold closure.
Suggestions for Foshan Joint Research Mold:
Optimize mold design to reduce neck material accumulation.
Ensure that the convex ring is properly clamped in the concave part of the mold top plate to avoid being too tight.
Adjust the positioning of the conveying arm and the blowing center to ensure accuracy.
4, Bottom line blue issue
Phenomenon: Pearlescent stripes appear along the bottom cutting line, and the defective bottle is thinner in this area.
Diagnosis: Improper mold design or operation resulting in uneven material distribution.
Solution for Foshan Heyan Mold:
Optimize mold design to ensure even distribution of bottom materials.
Adjust the blowing pressure and time to avoid excessive stretching.
5, Bottom damage issue
Phenomenon: There are often slight cracks at the bottom where the material accumulation is too thick, which can easily cause bursting during filling.
Diagnosis: The temperature at the bottom of the preform is too low, causing micro cracks during stretching.
Suggestions for Foshan Joint Research Mold:
Control the temperature at the end of the preform to avoid overcooling or overheating.
Adjust the gap between the stretching rod and the bottom of the mold to ensure accurate positioning.
6, Damage to the screw part of the bottle mouth
Phenomenon: The exhaust groove in the threaded area is stretched, especially in summer.
Diagnosis: The position of the conveying arm is inaccurate, causing the preform to be misaligned in the mold.
Solution for Foshan Heyan Mold:
Accurately adjust the position of the conveying arm to ensure that the preform is accurately fed into the mold.
Optimize the alignment of the blowing core and mold to avoid damage during stretching.
Control the temperature in the threaded area to reduce the risk of damage.
As a professional supplier of preform mold factories, Foshan Heyan Mold Co., Ltd. always pays attention to customers' needs and pain points. We not only provide high-quality PET preform molds, but also comprehensive technical support and solutions. Faced with common problems with bottle blowing molds, Foshan Heyan Mold will work together with customers to explore more efficient and stable solutions, help customers improve production efficiency, reduce operating costs, and create a better future together.
Foshan Heyan Precision Mould Technology Co., Ltd.'s main business is preform moulds, bottle blowing moulds, bottle cap moulds and other products. It has a strong engineering, R&D, technology and sales team, advanced processing equipment and rich project experience. If you want to know more or have special needs, please call 13318345050, or add our WhatsApp.
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