Yellowing and embrittlement of the bottle after ultraviolet irradiation

In the stretch '2079851475616104457 production process, the product exhibits the quality defect of "Yellowing and embrittlement of the bottle after ultraviolet irradiation".The specific manifestation is The bottle yellows after outdoor use.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 Yellowing and embrittlement of the bottle after ultraviolet irradiation 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. Poor PET UV resistance.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. 2. No light stabilizer added.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 Yellowing and embrittlement of the bottle after ultraviolet irradiation 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 Yellowing and embrittlement of the bottle after ultraviolet irradiation problem.

1. Add UV absorber.Formula and ratio adjustments should be determined on the basis of laboratory small-scale tests, and then verified by on-line pilot tests.Any change to the formula should be recorded and its impact on all aspects of product performance evaluated.Automatic metering and batching devices can effectively reduce manual batching errors and batch-to-batch fluctuations. 2. Use weather-resistant modified PET.Before introducing new tools, new materials or new methods, sufficient applicability evaluation and small-batch verification should be carried out.It is recommended to first conduct offline tests or simulation analyses outside production conditions, and introduce them into the formal production line only after confirming effectiveness and safety.Keep proper change management records to facilitate subsequent traceability and experience accumulation. 3. Avoid outdoor exposure.Before implementing this measure, its feasibility and expected effects should be fully evaluated, plan details communicated and confirmed with relevant technical personnel, key quality indicator changes closely monitored during implementation, adjustment effects recorded and fed back in a timely manner, forming reusable process experience. 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 "Yellowing and embrittlement of the bottle after ultraviolet irradiation" problem can be attributed to the combined action of multiple factors such as Poor PET UV resistance, No light stabilizer added.To solve this problem, it is necessary to start from aspects such as Add UV absorber, Use weather-resistant modified PET 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.