Cooling water leakage inside the preform core rod

In the stretch '2079851475616104457 production process, the product exhibits the quality defect of "Cooling water leakage inside the preform core rod".The specific manifestation is Cooling water seeps into the inner wall of the preform.This defect is more common when processing materials such as PET, PP and PC, and its occurrence is usually related to unreasonable settings of stretching temperature, stretch ratio, blowing pressure and preform heating uniformity.When the Cooling water leakage inside the preform core rod situation is severe, it will cause a series of chain quality defects in the product's appearance, dimensional accuracy, mechanical properties and other aspects, which not only reduces the product's functionality and safety in use, but also directly increases the scrap rate and production cost.Therefore, this problem requires systematic diagnosis and optimization from multiple dimensions such as material selection, the status of the stretch '2079851475616104457 machine, heating oven, stretch rod and blow mold, and stretching temperature, stretch ratio, blowing pressure and preform heating uniformity.

1. Aging of the core rod sealing ring.Resin undergoes thermal degradation, oxidative degradation and mechanochemical degradation under high temperature and shear, leading to molecular chain scission, reduced molecular weight and deteriorated mechanical properties.Controlling processing temperature within the safe window, shortening melt heat history time and adding appropriate heat stabilizers and antioxidants are effective means to inhibit degradation. 2. Cracks at the weld of the cooling pipe.Cooling conditions determine the setting process and final internal structure of the product.Uneven cooling causes shrinkage differences and residual stress leading to warpage and dimensional deviation; insufficient cooling makes the product not rigid enough at demolding; too rapid cooling produces large internal stress.The cooling system design should ensure uniform and efficient heat dissipation at all parts. In addition, the insufficient overall coordination of preform heating uniformity and biaxial stretch orientation control is also a factor that cannot be ignored; there are complex interactions and coupling relationships among the process parameters, and the deviation of any parameter may aggravate the degree of Cooling water leakage inside the preform core rod through chain effects. In terms of equipment maintenance, the regular overhaul and accuracy confirmation of the stretch '2079851475616104457 machine, heating oven, stretch rod and blow mold are not in place, causing the actual operating parameters of the equipment to deviate from process requirements, which will also become a potential inducement of the Cooling water leakage inside the preform core rod problem.

1. Replace the sealing ring.When replacing parts, original manufacturer spare parts of the same or higher specification should be selected to ensure installation accuracy and fit tolerances meet equipment technical requirements.After replacement, relevant parameters need to be recalibrated and trial runs conducted to verify the effect; normal production can only be resumed after confirming expectations are met.It is recommended to establish a spare parts life cycle management ledger. 2. Repair the welded area.Equipment maintenance should establish a three-level preventive maintenance system: daily inspection, regular maintenance and planned overhaul.The operating data and wear trends of key components should be continuously statistically analyzed, and the probability and time window of potential failures predicted through condition monitoring, transforming passive fault repair into active condition-based maintenance. 3. Regularly test the sealing of the core rod.Inspection work should establish a standardized checklist, specifying inspection items, technical standards, inspection frequency and responsible persons.Key equipment components should be regularly disassembled to check the condition of hidden parts, and judgment should not be based solely on operating appearance.Inspection results should be recorded in detail and a trend analysis mechanism established to predict potential failures. In terms of material management, incoming inspection of raw materials and in-process testing of work-in-progress should be strengthened, and key performance indicators of PET, PP and PC should be strictly controlled to ensure the stability of forming quality from the source.

In summary, the causes of the "Cooling water leakage inside the preform core rod" problem can be attributed to the combined action of multiple factors such as Aging of the core rod sealing ring, Cracks at the weld of the cooling pipe.To solve this problem, it is necessary to start from aspects such as Replace the sealing ring, Repair the welded area and take systematic governance measures.In actual production, it is recommended to establish a prevention and rapid response mechanism for this problem, achieving stable production and continuous improvement through preform heating uniformity and biaxial stretch orientation control.