The heat-sealed gaskets of packaging machines are key components to ensure the tightness of the seal. Wear can lead to air leakage, loose seals and other problems, which directly affect production efficiency and packaging quality. In view of the wear scenario of heat-sealed gaskets, the following warning and maintenance solutions are provided in combination with industry experience to help factories achieve accurate maintenance and reduce the risk of downtime.
1. Heat-sealed gasket wear detection method
Visual inspection and tactile evaluation
Check the surface of the heat-sealed gasket for scratches, depressions or edge wear every day. If the wear depth is greater than 0.5mm, it is necessary to pay special attention.
Press the elastic area of the gasket by hand. If the rebound force is significantly weakened (compared with the new gasket, it is reduced by more than 30%), indicating that the material is aging and needs to be replaced.
Sealing pressure test
Use an air pressure detector to measure the pressure value of the sealing area. If the fluctuation range is greater than 15% of the standard value, it indicates that the sealing performance of the gasket has decreased.
Industry general standard: The heat sealing pressure of the composite film packaging machine is recommended to be maintained in the range of 2.5-3.5kg/cm².
Thermal imaging assisted diagnosis
Observe the temperature distribution of the heat sealing area through an infrared thermal imager. If the local temperature difference is greater than 10°C, uneven heat conduction may occur due to gasket wear.
2. Wear warning signals and countermeasures
Primary warning (slight wear)
Phenomenon: Slight burrs on the edge of the sealing line, and the sealing strength decreases by 5%-10%.
Measures: Clean the residue on the surface of the gasket and adjust the sealing pressure to the upper limit to extend the remaining service life by 15-20 days.
Intermediate warning (moderate wear)
Phenomenon: Intermittent air leakage occurs at the sealing part, and the yield rate drops below 90%.
Measures: Shorten the inspection cycle to once per shift, prepare spare gaskets at the same time, and arrange replacement within 1 week.
Emergency replacement (severe wear)
Phenomenon: The gasket surface is cracked or delaminated, and the sealing failure leads to product contamination risks. Measures: Immediately stop the machine for replacement, and conduct a full inspection of the same batch of gaskets.
3. Replacement cycle recommendations and operating specifications
Periodic replacement standards
Normal working conditions: It is recommended to replace once every 3-6 months, and the specific cycle is adjusted according to the material type (silicone, fluororubber). High-intensity production: Equipment that works continuously for more than 18 hours/day is shortened to 2-4 months for replacement.
Standardized replacement process
Remove the old gasket: Use special tools to peel off the residual glue layer to avoid damaging the mold base. Install the new gasket: Evenly apply high-temperature resistant adhesive (thickness 0.1-0.3mm), press and let it stand for ≥2 hours to cure. Functional verification: Test the sealing pressure stability during no-load operation, and put it into production after passing the test. 4. Maintenance strategy to extend the life of the gasket
Environmental adaptability optimization
Control the workshop humidity ≤70% to avoid water vapor accelerating gasket oxidation. In high temperature seasons (＞35℃), increase the running time of the cooling fan to reduce the risk of thermal fatigue of the gasket.
Operational specification training
Overpressure operation is prohibited (such as setting pressure ＞4kg/cm²) to avoid excessive compression and deformation of the gasket.
When changing packaging materials, the heat sealing temperature and pressure parameters need to be adjusted simultaneously.
