Nanoval Technology-An Intermediate Process between Meltblown and Spunbond

Area of Science:

• Materials Science
• Polymer Engineering
• Textile Technology

Background:

• Nanoval technology integrates principles from metal injection molding (gas atomization) and spunbond processes.
• This novel approach aims to leverage the strengths of both established techniques for advanced material production.

Purpose of the Study:

• To experimentally determine the processing limits for spinning various polymers using Nanoval technology.
• To investigate the creation of defect-free fibers from polypropylene, standard polymers, and polyphenylene sulfide.
• To analyze the fluid dynamics and filament motion within the Nanoval process through numerical simulation.

Main Methods:

• Experimental evaluation of polymer spinning limits for defect-free fiber formation.
• Numerical simulation of turbulent airflow and filament motion.
• Process modeling to assess the impact of guide plates on airflow dynamics.
• Analysis of melt flow index (MFI) for processible polymer grades.

Main Results:

• The study identified processing limits for defect-free fiber creation across diverse polymers.
• Numerical simulations revealed an earlier transition to turbulent viscoelastic behavior compared to meltblown processes.
• Optimized airflow using guide plates significantly reduced turbulence.
• Adjustable mean fiber diameters for polypropylene ranged from 0.8 to 39.3 μm.

Conclusions:

• Nanoval technology offers significant flexibility in producing polymer fibers with diameters spanning from meltblown (~1-7 μm) to spunbond (~15-30 μm) ranges.
• The process effectively operates in the intermediate diameter range between these two established methods.
• The findings demonstrate Nanoval technology's potential for versatile nonwoven material production.