Surface Observation and Pore Size Analyses of Polypropylene/Low-Melting Point Polyester Filter Materials: Influences of Heat TreatmentJia-Horng Lin, Ying-Huei Shih, Ting-Ting Li, Yi-Jun Pan, Chien-Lin Huang and Ching-Wen LouMATEC Web Conf., 67 (2016) 07028DOI: https://doi.org/10.1051/matecconf/20166707028