Uneven lamp tube damage in the heating oven

In the stretch '2079851475616104457 production process, the product exhibits the quality defect of "Uneven lamp tube damage in the heating oven". The specific manifestation is that some lamp tubes in the heating oven are damaged, causing uneven heating. This defect is relatively common when processing materials such as PET, PP, PC, and its occurrence conditions are usually related to the unreasonable settings of stretching temperature, stretch ratio, blowing pressure, and preform heating uniformity. When the "Uneven lamp tube damage in the heating oven" situation is severe, it will cause a series of chain quality defects in the product in terms of appearance, dimensional accuracy, mechanical properties, etc., which not only reduces the functionality and safety of the product 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 stretch '2079851475616104457 machine, heating oven, stretch rod, and blow mold, and stretching temperature, stretch ratio, blowing pressure, and preform heating uniformity.

1. Lamp tube aging. Under the action of high temperature and shear, the resin will undergo thermal degradation, oxidative degradation, and mechanochemical degradation, leading to molecular chain scission, molecular weight reduction, 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 of inhibiting degradation. 2. Voltage fluctuation. Uniformity runs through every link 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 various physical quantities is a prerequisite for obtaining products with good consistency and stable quality. 3. Poor heat dissipation. This factor causing the problem reflects that certain process conditions or material characteristics in stretch blow '2079851475616104453ing have not met the optimal molding requirements. Such problems are often cumulative and hidden, and should be investigated and verified as key focus items during process debugging and finalization to ensure that hidden dangers are eliminated at the source. In terms of equipment maintenance, the regular overhaul and precision confirmation of the stretch '2079851475616104457 machine, heating oven, stretch rod, and blow mold are not in place, causing the actual operating parameters of the equipment to deviate from the process requirements, which will also become a potential inducement of the "Uneven lamp tube damage in the heating oven" problem.

1. Regularly replace the lamp tubes. When replacing parts, original factory spare parts of the same or higher specifications should be selected to ensure that the installation accuracy and fitting tolerances meet the equipment technical requirements. After replacement, relevant parameters need to be recalibrated and trial runs performed to verify the effect; normal production can only be resumed after confirming that expectations are met. It is recommended to establish a spare parts life cycle management ledger. 2. Stabilize the power supply voltage. 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, closely monitor changes in key quality indicators, promptly record and feedback the adjustment effect, and form reusable process experience. 3. Improve heat dissipation. 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 parameter optimization and structural improvement in a targeted manner to achieve twice the result with half the effort. In terms of material management, incoming inspection of raw materials upon arrival and in-process inspection of work-in-progress should be strengthened, and the key performance indicators of PET, PP, PC should be strictly controlled to ensure the stability of molding quality from the source.

In summary, the causes of the "Uneven lamp tube damage in the heating oven" problem can be attributed to the combined action of multiple factors such as Lamp tube aging, Voltage fluctuation. Solving this problem requires starting from aspects such as Regularly replace the lamp tubes, Stabilize the power supply voltage and adopting systematic governance measures. In actual production, it is recommended to establish a prevention and rapid response mechanism for this problem, and achieve stable production and continuous improvement through preform heating uniformity and biaxial stretch orientation control.