Effect of Seal Process Parameters on Final Seal Strength Behavior for LLDPE

摘要

Heat sealing is joining two polymer surfaces while they are at least partially molten, by applying heat and pressure. The evolution of seal strength with seal process conditions was investigated in order to achieve high quality seals and high packaging production rates. This optimization of heat sealing process parameters (Pressure, Temperature and dwell time) in terms of seal strength was performed on a monolayer linear low-density polyethylene (LLDPE) film. Increasing dwell time enhanced seal strength, as expected, because of the more time available for diffusion. By increasing pressure, an increase in seal strength was observed; however, the effect of pressure was not as significant as the effect of dwell time. At very high pressure range, seal curves showed a narrower temperature window.