Improper addition ratio of regrind

During the injection '2079851475616104457 production process, the product exhibits the quality defect of "Improper addition ratio of regrind". Specifically manifested as an excessively high regrind proportion causing a decline in product quality. 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 Improper addition ratio of regrind 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. Regrind degraded by repeated multiple processing. Under the action of high temperature and shear, the resin undergoes thermal degradation, oxidative degradation, and mechanochemical degradation, leading to molecular chain scission, reduced molecular weight, 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 to suppress degradation. 2. Proportion control not strict. 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. In addition, insufficient overall coordination between parison wall thickness uniformity and transfer temperature control is also a factor that cannot be ignored; there are complex interactions and coupling relationships among the various process parameters, and the deviation of any single parameter may aggravate the degree of Improper addition ratio of regrind through chain effects. 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 Improper addition ratio of regrind problem.

1. Limit the regrind proportion. The adjustment of formulations and ratios should determine the plan on the basis of laboratory small-scale tests, and then be verified by on-line pilot tests. Any change in the formulation should be recorded and its impact on all aspects of product performance evaluated. Automatic metering and batching devices can effectively reduce errors and batch-to-batch fluctuations of manual batching. 2. Fully mix the new and old materials. 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, changes in key quality indicators should be closely monitored, and the adjustment effect should be recorded and fed back in a timely manner to form reusable process experience. 3. Regularly test the properties of the regrind. Inspection work should establish a standardized inspection checklist, clarifying the inspection items, technical standards, inspection frequency, and responsible persons. Key equipment components should be regularly disassembled to inspect 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 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 "Improper addition ratio of regrind" problem can be attributed to the combined action of multiple factors such as regrind degraded by repeated multiple processing and proportion control not strict. Solving this problem requires starting from aspects such as limit the regrind proportion and fully mix the new and old materials, 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.