Improper usage ratio of recycled PET material

In the stretch '2079851475616104457 production process, the product exhibits the quality defect of "Improper usage ratio of recycled PET material". The specific manifestation is that an excessively high proportion of recycled material causes IV decrease and unstable product quality. This defect is relatively common when processing materials such as PET, PP, PC, and its occurrence conditions are usually related to the unreasonable settings of stretching temperature, stretch ratio, blowing pressure, and preform heating uniformity. When the "Improper usage ratio of recycled PET material" situation is severe, it will cause a series of chain quality defects in the product in terms of appearance, dimensional accuracy, mechanical properties, etc., which not only reduces the functionality and safety of the product 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. Degradation of recycled material from multiple processing cycles. Under the action of high temperature and shear, the resin will undergo thermal degradation, oxidative degradation, and mechanochemical degradation, leading to molecular chain scission, molecular weight reduction, and deterioration of mechanical properties. Controlling the processing temperature within a safe window, shortening the melt thermal history time, and adding appropriate heat stabilizers and antioxidants are effective means of inhibiting degradation. 2. Loose ratio control. This factor causing the problem reflects that certain process conditions or material characteristics in stretch blow '2079851475616104453ing have not met the optimal molding requirements. Such problems are often cumulative and hidden, and should be investigated and verified as key focus items during process debugging and finalization to ensure that 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 one parameter may aggravate the degree of "Improper usage ratio of recycled PET material" through chain effects. In terms of equipment maintenance, the regular overhaul and precision 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 the process requirements, which will also become a potential inducement of the "Improper usage ratio of recycled PET material" problem.

1. Limit the recycled material ratio to ≤10%. The adjustment of formulas and proportions should be determined on the basis of laboratory small-scale tests, and then verified by on-line pilot tests. Any change in the formula should be recorded and its impact on all aspects of product performance should be evaluated. Automatic metering and batching devices can effectively reduce errors in manual batching and batch-to-batch fluctuations. 2. Re-viscosity the recycled material. Before implementing this measure, its feasibility and expected effect should be fully evaluated, and the details of the plan should be communicated and confirmed with relevant technical personnel; during implementation, closely monitor changes in key quality indicators, promptly record and feedback the adjustment effect, and form reusable process experience. It is recommended to formulate a preventive checklist for the "Improper usage ratio of recycled PET material" 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 the problem. In terms of material management, incoming inspection of raw materials upon arrival and in-process inspection of work-in-progress should be strengthened, and the key performance indicators of PET, PP, PC should be strictly controlled to ensure the stability of molding quality from the source.

In summary, the causes of the "Improper usage ratio of recycled PET material" problem can be attributed to the combined action of multiple factors such as Degradation of recycled material from multiple processing cycles, Loose ratio control. Solving this problem requires starting from aspects such as Limit the recycled material ratio to ≤10%, Re-viscosity the recycled material and adopting systematic governance measures. In actual production, it is recommended to establish a prevention and rapid response mechanism for this problem, and achieve stable production and continuous improvement through preform heating uniformity and biaxial stretch orientation control.