Carbonized black lines inside the parison

In the injection '2079851475616104457 production process, the product exhibits the quality defect of "Carbonized black lines inside the parison".The specific manifestation is Black carbonized lines appear within the parison wall.This defect is more common when processing materials such as PET, PP, HDPE and PS, and its occurrence is usually related to unreasonable settings of injection pressure, parison temperature, blowing pressure and mold temperature.When the Carbonized black lines inside the parison 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 injection '2079851475616104457 machine, core rod, parison mold, blow mold and transfer mechanism, and injection pressure, parison temperature, blowing pressure and mold temperature.

1. Material accumulation and carbonization inside the hot runner.This factor causing the problem reflects that certain process conditions or material properties in injection '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. Screw surface damage.This factor causing the problem reflects that certain process conditions or material properties in injection '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 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 process parameters, and the deviation of any parameter may aggravate the degree of Carbonized black lines inside the parison through chain effects. In terms of equipment maintenance, the regular overhaul and accuracy confirmation of the injection '2079851475616104457 machine, core rod, parison mold, blow mold and transfer mechanism 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 Carbonized black lines inside the parison problem.

1. Regularly clean the hot runner.Cleaning work should be incorporated into the equipment preventive maintenance plan, and the cleaning frequency should be reasonably determined according to the actual conditions of the processed material and operating cycle.Use dedicated cleaning tools and cleaning materials to avoid scratching or electrolytic corrosion of the cavity surface caused by improper operation.After cleaning, re-check and confirm that the key clearances are accurate. 2. Check the surface condition of the screw.Inspection work should establish a standardized checklist, specifying inspection items, technical standards, inspection frequency and responsible persons.Key equipment components should be regularly disassembled to check 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. 3. Use dedicated purging material.Cleaning work should be incorporated into the equipment preventive maintenance plan, and the cleaning frequency should be reasonably determined according to the actual conditions of the processed material and operating cycle.Use dedicated cleaning tools and cleaning materials to avoid scratching or electrolytic corrosion of the cavity surface caused by improper operation.After cleaning, re-check and confirm that the key clearances are accurate. 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, HDPE and PS should be strictly controlled to ensure the stability of forming quality from the source.

In summary, the causes of the "Carbonized black lines inside the parison" problem can be attributed to the combined action of multiple factors such as Material accumulation and carbonization inside the hot runner, Screw surface damage.To solve this problem, it is necessary to start from aspects such as Regularly clean the hot runner, Check the surface condition of the screw 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 parison wall thickness uniformity and transfer temperature control.