With global bans on single-use plastics, packaging manufacturers are shifting to compostable bioplastics like PBAT, PLA, and cornstarch compounds. However, their unique rheology demands precise extrusion and sealing parameters.
Overcoming Low Melt Strength in Blown Film Extrusion
PBAT/PLA blends have lower melt strength than standard LDPE, making the bubble susceptible to collapse or gauge variation. Keep extrusion temperatures strictly between 140°C and 165°C, utilize a low-shear screw profile, and maintain consistent low-velocity air cooling around the die lip.
Sealing & Cutting Bioplastic Bags Without Stretching
Biopolymer films have lower thermal resistance. Conventional high-temperature sealing knives cause puckering and pinhole burn-through. Converters like our T-PRO Series utilize digital PID temperature control with Teflon-coated sealing bars to achieve airtight seals at rapid cycle speeds.
