Uneven parison wall thickness

During the injection '2079851475616104457 production process, the product exhibits the quality defect of "Uneven parison wall thickness". Specifically manifested as obvious differences in the circumferential wall thickness of the parison. 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 Uneven parison wall thickness 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. Core rod eccentricity. 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. 2. Uneven gap between the die and the core rod. Uniformity runs through every stage of the '2079851475616104453. Uneven temperature, uneven pressure distribution, uneven cooling, uneven material mixing, etc. will all lead to dispersion in product quality. Ensuring the uniform distribution of all physical quantities is a prerequisite for obtaining products with good consistency and stable quality. 3. Uneven injection pressure. Pressure directly determines the filling ability of the melt and the mold-contacting effect during the '2079851475616104453. Insufficient pressure results in incomplete filling and poor replication accuracy; excessive pressure may cause secondary defects such as flash and excessive internal stress. The setting of pressure should comprehensively consider factors such as material viscosity, product dimensions, and mold structure. 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 Uneven parison wall thickness problem.

1. Correct the alignment of the core rod. Calibration work should use standard instruments that have been verified as qualified by legal metrological verification institutions, and be carried out strictly in accordance with the specified cycle and method. The calibration results should form a written technical report, giving the deviation value and expanded uncertainty. Out-of-tolerance equipment should be immediately taken out of service and marked for repair, and can only be restored to use after passing recalibration. 2. Adjust the die gap. Optimization work must be based on an accurate diagnosis of the root cause of the problem, and blind attempts must be avoided. It is recommended to first determine the key influencing factors and their interactions through the process DOE test method or historical production data analysis, and then carry out targeted parameter optimization and structural improvement to achieve twice the result with half the effort. 3. Check the accuracy of the mold guide pins. 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 "Uneven parison wall thickness" problem can be attributed to the combined action of multiple factors such as core rod eccentricity and uneven gap between the die and the core rod. Solving this problem requires starting from aspects such as correct the alignment of the core rod and adjust the die gap, 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.