The accuracy and stability of packaging equipment can be assessed from the following aspects:

Accuracy Assessment

1. Packaging Size Accuracy
   • Check Equipment Specifications: The product manual or technical documentation of the equipment will specify the accuracy range for packaging sizes. For example, for bag-making packaging machines, they can precisely control the error range of the bag's length, width, and thickness; the smaller the error, the higher the accuracy. Generally, high-precision packaging equipment can control the error in bag length within ±1mm.
   • Actual Product Measurement: Sampling measurements can be conducted on the finished packaging products produced by the packaging equipment. Using tools such as calipers and thickness gauges, measure the length, width, height, and other dimensions of the packaging, and then calculate the deviation from the set dimensions. If the deviations remain within a small range across multiple sample measurements, it indicates that the equipment has high dimensional accuracy.
2. Weight Accuracy (Applicable to Quantitative Packaging Equipment)
   • Check Weighing System: Understand the accuracy level of the weighing sensors used in the equipment. High-precision weighing sensors can measure material weight more accurately. For example, some advanced electronic weighing sensors can achieve an accuracy of ±0.1g or even higher. Also, check whether the weighing system has calibration functions, as well as the frequency and convenience of calibration.
   • Conduct Weight Testing: During the operation of the equipment, randomly sample and weigh the packaged products. Compare the actual weighing results with the target weight. For quantitatively packaged products, such as food and pharmaceuticals, high-precision equipment can keep weight deviations within a very small range, such as ±1%.
3. Sealing Accuracy
   • Observe Sealing Quality: Check the sealing condition at the seal, including the width, flatness, and sealing strength. For heat-sealing equipment, high-precision seals should have uniform and consistent sealing widths, without wrinkles, bubbles, or poor sealing. For example, in the plastic film sealing process, good sealing equipment can control the sealing width error within ±0.5mm.
   • Sealing Integrity Testing: Simple methods can be used to test the sealing integrity, such as immersing the packaged product in water to observe if any bubbles emerge; or using specialized sealing integrity testing equipment to measure the gas leakage rate inside the packaging. A lower leakage rate indicates higher sealing accuracy.

Stability Assessment

1. Long-Term Operation Testing
   • Continuous Operation Observation: Allow the packaging equipment to run continuously for a period, such as 8 to 12 hours or even longer. During operation, observe whether the equipment experiences failures, such as mechanical component jamming or electrical system fault alarms. Also, record any changes in packaging accuracy after long-term operation, such as whether dimensional deviations increase or weight fluctuations become significant. If the equipment can maintain stable packaging accuracy after long-term operation, it indicates good stability.
   • Production Data Statistical Analysis: Record production data through the equipment's control system, including changes in packaging speed and accuracy parameters over time. Use statistical methods to analyze this data to check for significant fluctuations or anomalies. For example, calculate the standard deviation of packaging size deviations; if the standard deviation is small, it indicates high stability of dimensional accuracy during long-term operation.
2. Environmental Adaptability Testing (if applicable)
   • Temperature and Humidity Variation Testing: If the packaging equipment may be used in different temperature and humidity environments, simulate these conditions for testing. Observe the equipment's performance in high temperature, low temperature, high humidity, and low humidity environments, including packaging accuracy, speed, and whether any faults occur. For example, some high-precision electronic packaging equipment may experience performance changes in electronic components due to significant temperature variations, affecting packaging accuracy and stability. Stable equipment should be able to maintain normal operating conditions and packaging accuracy within a certain range of temperature and humidity.
   • Dust and Vibration Environment Testing: For packaging equipment used in harsh industrial environments, such as in dusty workshops or near vibration sources, it is necessary to test the equipment's resistance to interference in these environments. Check whether the equipment's dust-proof measures are effective and whether it can maintain mechanical structure stability and packaging accuracy in a vibrating environment. For example, equipment with good stability will use shock-resistant mechanical components and well-sealed electrical systems to reduce the impact of dust and vibration.
3. Component Quality and Assembly Process Evaluation
   • Mechanical Component Inspection: Check the quality of key mechanical components of the equipment, such as motors, drive gears, chains, and conveyor belts. High-quality mechanical components typically have better wear resistance, corrosion resistance, and accuracy retention. For example, high-precision gears should have precise tooth shapes and good surface finish to ensure stable and accurate power transmission. Also, check the assembly accuracy between components, such as the fit clearance between shafts and bearings, and the meshing accuracy of gears. Equipment with high assembly accuracy can reduce vibration and wear during operation, thereby improving stability.
   • Electrical System Inspection: Evaluate the stability of the electrical system, including the quality and reliability of components such as controllers, sensors, and contactors. High-quality controllers can precisely control the equipment's operating speed, position, and action sequence, while reliable sensors can accurately feedback signals. Check whether the wiring of the electrical system is neat and reasonable, and whether there are good shielding and grounding measures to prevent electromagnetic interference, as these factors can affect the stability of the equipment.