Parison scratched during transfer (deformation)

During the injection '2079851475616104457 production process, the product exhibits the quality defect of "Parison scratched during transfer (deformation)". Specifically manifested as the parison being scratched or deformed when transferred from the injection mold to the blow mold. This defect is relatively common when processing materials such as PET, PP, HDPE, and PS, and its occurrence conditions are usually related to unreasonable settings of injection pressure, parison temperature, blowing air pressure, and mold temperature. When the Parison scratched during transfer (deformation) situation is severe, it will cause a series of chain-reaction quality defects in the product in terms of appearance, dimensional accuracy, mechanical properties, etc., which not only reduces the usability and safety of the product, but also directly increases the scrap rate and production cost. Therefore, this problem requires systematic diagnosis and optimization from multiple dimensions, including material selection, the condition of the injection '2079851475616104457 machine, core rod, parison mold, blow mold, and transfer mechanism, as well as injection pressure, parison temperature, blowing air pressure, and mold temperature.

1. Poor positioning accuracy of the transfer mechanism. This factor leading to the problem reflects that certain process conditions or material properties in injection blow '2079851475616104453ing have not met the optimal molding requirements. Such problems often have cumulative and hidden characteristics, and should be investigated and verified as key focus items during process debugging and finalization to ensure that hidden dangers are eliminated from the source. 2. Transfer speed too fast. Speed parameters affect the flow state and time allocation of the melt during the '2079851475616104453. A speed that is too slow leads to premature cooling and insufficient filling; a speed that is too fast causes melt fracture, air entrapment, and shear overheating. The optimization of the speed curve should make the melt flow smoothly and orderly in the cavity. 3. Parison temperature too high. Temperature is the core factor affecting melt fluidity and viscosity. Setting the temperature too high will cause the melt viscosity to decrease, insufficient melt strength, and even thermal degradation; if the temperature is too low, the melt fluidity is poor and plasticization is insufficient, making it impossible to fill or mold smoothly. A reasonable temperature window should be optimally determined within the recommended range according to the melting characteristics and thermal stability of the material. In terms of equipment maintenance, inadequate regular overhaul and accuracy confirmation of the injection '2079851475616104457 machine, core rod, parison mold, blow mold, and transfer mechanism cause the actual operating parameters of the equipment to deviate from the process requirements, which can also become a potential inducement of the Parison scratched during transfer (deformation) problem.

1. Calibrate the accuracy of the transfer mechanism. Calibration work should use standard instruments that have been verified as qualified by legal metrological verification institutions, and be carried out strictly in accordance with the specified cycle and method. The calibration results should form a written technical report, giving the deviation value and expanded uncertainty. Out-of-tolerance equipment should be immediately taken out of service and marked for repair, and can only be restored to use after passing recalibration. 2. Reduce the transfer speed. Adjustments should follow the principle of gradual progress; the magnitude of each adjustment should not be too large, and it is recommended to decrease in steps of 5%~15% of the current value. After each adjustment, observe the product quality changes stably for at least 5~10 mold cycles, and continue adjusting only after confirming that the improvement direction is correct; one-step excessive adjustment must be avoided. 3. Control the parison temperature. The key to process parameter control lies in establishing a reliable closed-loop feedback adjustment mechanism. Through online real-time detection and SPC statistical process monitoring, deviation trends are discovered in time, and automatic control systems or manual intervention are used to maintain key parameters within the set window, achieving a fundamental transformation from after-the-fact remediation to prior prevention. In terms of material management, incoming inspection of raw materials and in-process inspection of work-in-progress should be strengthened, and the key performance indicators of PET, PP, HDPE, and PS should be strictly controlled to ensure the stability of molding quality from the source.

In summary, the causes of the "Parison scratched during transfer (deformation)" problem can be attributed to the combined action of multiple factors such as poor positioning accuracy of the transfer mechanism and transfer speed too fast. Solving this problem requires starting from aspects such as calibrate the accuracy of the transfer mechanism and reduce the transfer speed, and adopting 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 parison wall thickness uniformity and transfer temperature control.