Bottle mouth leakage of the product after low-temperature storage

In the injection '2079851475616104457 production process, the product exhibits the quality defect of "Bottle mouth leakage of the product after low-temperature storage".The specific manifestation is The bottle mouth seal of the product fails after cold-chain storage.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 Bottle mouth leakage of the product after low-temperature storage 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. Low-temperature shrinkage of the resin causes bottle mouth dimensional changes.Material selection and handling are the foundation of forming quality.The intrinsic properties of the resin such as molecular weight, molecular weight distribution and melt index determine its processing window and final performance.Factors such as excessive moisture content of raw materials, mixed impurities and improper regrind ratios will all cause various defects during processing. 2. Loose thread fit.Mechanical wear and loosening during long-term equipment operation will cause clearance changes, decreased accuracy and unstable operation, thereby triggering various process and quality problems.Establishing a regular inspection and preventive maintenance system for equipment operating status, and timely repairing or replacing worn parts, is a necessary measure to maintain equipment accuracy and process stability. 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 Bottle mouth leakage of the product after low-temperature storage 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 Bottle mouth leakage of the product after low-temperature storage problem.

1. Select a resin with small low-temperature shrinkage.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. 2. Optimize the bottle mouth thread design.Optimization work must be based on accurate diagnosis of the root cause of the problem; blind attempts must be avoided.It is recommended to first determine the key influencing factors and their interactions through process DOE test methods or historical production data analysis, and then carry out targeted parameter optimization and structural improvement to achieve twice the result with half the effort. It is recommended to formulate a preventive checklist for the Bottle mouth leakage of the product after low-temperature storage problem, incorporate parison wall thickness uniformity and transfer temperature 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 problems. 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 "Bottle mouth leakage of the product after low-temperature storage" problem can be attributed to the combined action of multiple factors such as Low-temperature shrinkage of the resin causes bottle mouth dimensional changes, Loose thread fit.To solve this problem, it is necessary to start from aspects such as Select a resin with small low-temperature shrinkage, Optimize the bottle mouth thread design 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.