Polybutylene Adipate Terephthalate Meltblown Nonwoven With Annular Meltblown Die: Processability and Structure–Property Relationship

ABSTRACT

This study evaluates the meltblown processing behavior of Polybutylene Adipate Terephthalate (PBAT), one of promising biodegradable polymers, and investigates the complex processing–structure–property relationships inherent in meltblown fabrication by using a Biax meltblowing system, which features a multi‐row spinneret and a concentric air‐stream design. With Die A ( d  = 510 μm), stable meltblown formation was achieved over a temperature range of 210°C–240°C with high polymer throughput. Throughput and processing temperature greatly influence the structure and properties of the meltblown produced with this die. In contrast, Die B ( d  = 230 μm) exhibited a much narrower processing window of 230°C–240°C and a maximum polymer throughput of 0.07 g/min. The produced nonwovens generally exhibited poor tensile properties and lower web uniformity. Nevertheless, Die B could produce finer fibers with enhanced barrier performance. The highest barrier performance and fabric toughness was achieved at DCD values of 350–400 mm. Decreasing throughput and air pressure enhanced barrier properties while minimally affecting tensile properties. This study demonstrates the potential adaptation of PBAT polymer in existing meltblown equipment while highlighting the unique characteristics of PBAT polymer behavior in meltblowing process.