For manufacturers relying on bagging machines, a loose seal is more than just a production glitch—it leads to product spoilage, return complaints, and brand damage. The root cause often lies in mismatched temperature and pressure settings, not equipment failure. By mastering scientific parameter-matching formulas and industry-proven benchmarks, you can resolve sealing issues efficiently. Huanlian Packaging’s equipment, designed with precision control, further simplifies this process.
Material type is the foundational factor for parameter setting. Different bag materials have distinct melting points and pressure tolerances. For common materials:
- PE (Polyethylene) bags: Use the formula “Temperature (℃) = 180 + (Thickness × 20)”, with pressure set to 0.5–0.7MPa. For 50μm thick PE bags, temperature should be 180 + (50×0.001×20) = 190℃, paired with 0.6MPa pressure. This prevents under-sealing from low temperature or bag deformation from high pressure.
- OPP (Oriented Polypropylene) composite bags: Follow “Temperature (℃) = 170 + (Thickness × 15)”, pressure at 0.4–0.6MPa. A 80μm OPP composite bag needs 170 + (80×0.001×15) = 182℃ and 0.5MPa pressure, avoiding brittle seals from overheating.
- Heat-sensitive materials (e.g., PVC): Adopt “Temperature (℃) = 150 + (Thickness × 10)”, pressure reduced to 0.3–0.5MPa. This balances seal strength and material integrity.
Speed adjustment is critical for parameter synergy. If your line runs faster than 30 bags/min, increase temperature by 5–10℃ and pressure by 0.05MPa to compensate for shorter heat contact time. For Huanlian’s YH-MA51K high-speed bagging machine (20–50 bags/min), its built-in “speed-parameter linkage” automatically adjusts settings, eliminating manual tweaks.
Troubleshooting common issues follows clear rules. If seals have bubbles, lower temperature by 5–8℃ first; if seals split when squeezed, raise temperature by 10℃ and pressure by 0.05MPa. For uneven seals, check if pressure springs are balanced—Huanlian’s machines have dual-spring pressure regulators for uniform force.
Environment also matters. In humid areas (RH > 70%), increase temperature by 3–5℃ to counter moisture interference. Huanlian’s equipment includes humidity sensors that alert operators to adjust parameters, ensuring consistent sealing quality.
By combining material-specific formulas, speed adaptation, and equipment advantages like Huanlian’s precision control, you can achieve 99% seal reliability. These formulas aren’t just guidelines—they’re time-tested solutions to turn sealing frustrations into smooth production.
