Abnormal temperature fluctuation at the core rod end

In the injection '2079851475616104457 production process, the product exhibits the quality defect of "Abnormal temperature fluctuation at the core rod end".The specific manifestation is The temperature at the core rod end fluctuates out of control.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 Abnormal temperature fluctuation at the core rod end 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. Blockage or unstable flow in the cooling channel inside the core rod.Cooling conditions determine the setting process and final internal structure of the product.Uneven cooling causes shrinkage differences and residual stress leading to warpage and dimensional deviation; insufficient cooling makes the product not rigid enough at demolding; too rapid cooling produces large internal stress.The cooling system design should ensure uniform and efficient heat dissipation at all parts. 2. Temperature sensor failure.Temperature is the core factor affecting melt fluidity and viscosity.Excessively high temperature settings will cause decreased melt viscosity, insufficient melt strength and even thermal degradation; excessively low temperature results in poor melt fluidity and insufficient plasticization, making smooth filling or forming impossible.A reasonable temperature window should be optimally determined within the recommended range according to the melting characteristics and thermal stability of the material. 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 Abnormal temperature fluctuation at the core rod end 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 Abnormal temperature fluctuation at the core rod end problem.

1. Clean the cooling channels.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. Install a flow regulating valve.Installation of equipment or accessories should strictly follow the installation manual; key mating surfaces must be cleaned and checked for damage before installation.Fastening bolts should be tightened evenly according to the specified torque values and diagonal sequence; after installation, use precision measuring tools to verify whether the installation accuracy meets technical requirements. 3. Service the sensor.Equipment maintenance should establish a three-level preventive maintenance system: daily inspection, regular maintenance and planned overhaul.The operating data and wear trends of key components should be continuously statistically analyzed, and the probability and time window of potential failures predicted through condition monitoring, transforming passive fault repair into active condition-based maintenance. 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 "Abnormal temperature fluctuation at the core rod end" problem can be attributed to the combined action of multiple factors such as Blockage or unstable flow in the cooling channel inside the core rod, Temperature sensor failure.To solve this problem, it is necessary to start from aspects such as Clean the cooling channels, Install a flow regulating valve 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.