Plastic sealing equipment is widely used in food, cosmetics, daily chemicals and other industries, and the heating component is the core part to ensure the sealing effect. The unstable heating of traditional heaters often leads to problems such as incomplete sealing, broken sealing edges and blistered packaging bags, affecting the product quality and delivery time. Internal wiring cartridge heaters have become the preferred heating component for plastic sealing equipment with their stable heating, uniform temperature and long service life, and there are several key points to pay attention to when selecting.
First of all, the temperature control stability of the heater is the primary consideration. Plastic sealing requires a constant and appropriate temperature, too high temperature will burn the plastic packaging, too low temperature will lead to incomplete sealing. Internal wiring cartridge heaters have a surface load of 25W per square centimeter, which can achieve rapid and uniform heating, and the temperature fluctuation is small, which can always maintain the optimal sealing temperature. The internal high-purity magnesium oxide filling ensures efficient heat transfer, avoiding local hot spots and ensuring the consistency of the sealing effect.
Secondly, the structural design of the heater must adapt to the working characteristics of plastic sealing equipment. The equipment runs continuously for a long time, and the vibration during operation is large, so the heater must have good vibration resistance. The internal wiring design without external terminals avoids the failure caused by terminal loosening due to vibration, and the high-strength stainless steel sheath and compact internal structure make the heater have strong mechanical properties, can withstand long-term vibration, and maintain stable operation.
Material selection is also crucial. The outer sheath of the heater is recommended to choose SUS304 stainless steel, which has good corrosion resistance, can resist the corrosion of plastic volatiles and moisture in the sealing process, and prolong the service life. The internal nickel-chromium alloy heating wire has good oxidation resistance, not easy to burn out under long-term high-temperature operation, and the wire can be used for a long time at 350℃, matching the continuous high-temperature working conditions of sealing equipment.
Performance parameters must meet industrial safety and use standards. The heater should comply with CE standards, cold-state withstand voltage AC 1500V, hot-state insulation performance AC 1000V, insulation resistance greater than 50MΩ, leakage current less than 0.5MA, to ensure the safe operation of the equipment, avoid safety accidents such as electric leakage, and protect the safety of operators.
In addition, the dimensional accuracy of the heater cannot be ignored. The coreless grinding process makes the diameter of the heater highly standardized, which can be closely matched with the installation position of the sealing equipment, no gap, no heat loss, ensuring that the heat is completely applied to the sealing part. The length and power of the heater should be selected according to the size and sealing speed of the sealing equipment to ensure that the heating efficiency matches the production speed of the equipment.
Finally, the service life and failure rate of the heater are also key selection factors. Internal wiring cartridge heaters have a longer service life than traditional heaters, low failure rate, reduce the number of heater replacements and equipment downtime, improve the production efficiency of sealing equipment, and reduce maintenance costs. For plastic sealing enterprises, choosing a high-quality internal wiring cartridge heater can effectively improve the sealing qualified rate, reduce defective products, and bring better economic benefits.
