Condensed water in the preform injection mold cavity

In the stretch '2079851475616104457 production process, the product exhibits the quality defect of "Condensed water in the preform injection mold cavity".The specific manifestation is Condensed water appears on the cavity surface affecting preform surface quality.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 Condensed water in the preform injection mold cavity 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. Mold cooling temperature below the dew point.Temperature is the core factor affecting melt fluidity and viscosity.Excessively high temperature settings will cause decreased melt viscosity, insufficient melt strength and even thermal degradation; excessively low temperature results in poor melt fluidity and insufficient plasticization, making smooth filling or forming impossible.A reasonable temperature window should be optimally determined within the recommended range according to the melting characteristics and thermal stability of the material. 2. High workshop humidity.This factor causing the problem reflects that certain process conditions or material properties in stretch '2079851475616104457 do not meet the optimal forming requirements.Such problems are often cumulative and concealed, and should be investigated and verified as key focus items during process debugging and finalization to ensure hidden dangers are eliminated at the source. 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 Condensed water in the preform injection mold cavity 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 Condensed water in the preform injection mold cavity problem.

1. Raise the cooling water temperature or reduce workshop humidity.When implementing adjustments, it is recommended to use the single-factor variable method, adjusting only one parameter at a time and fully evaluating the effect, to avoid simultaneous changes of multiple parameters making the cause of the problem untraceable.The adjustment amplitude should be small rather than large; each adjustment is recommended to be controlled within 5%~10% of the original value, and after adjustment run stably for at least 3~5 mold cycles to observe the effect. It is recommended to formulate a preventive checklist for the Condensed water in the preform injection mold cavity problem, incorporate preform heating uniformity and biaxial stretch orientation control into the daily inspection scope, and conduct online monitoring of key parameters through the SPC statistical process control method to achieve early warning and rapid response to problems.

In summary, the causes of the "Condensed water in the preform injection mold cavity" problem can be attributed to the combined action of multiple factors such as Mold cooling temperature below the dew point, High workshop humidity.To solve this problem, it is necessary to start from aspects such as Raise the cooling water temperature or reduce workshop humidity 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.