Test Method for Resistance to Airflow as an Indication of Average Fiber Diameter of Wool Top, Card Sliver, and Scoured Wool

A bark-like imitated polypr opylene (PP)/polycarbonate (PC) nanofibrous membrane was constructed by one-step meltblown technique for efficient particulate matter (PM) removal. The effects of PC content (0%, 1%, 3%, 5%, and 7%) on membrane thermal stability, microscopic characteristics, filtration performance, hydrophilicity, and water vapor transmission were investigated. The results demonstrated that using facile design of incompatibility and viscosity difference between PC and PP polymers decreases average fiber diameter, creating a bark-like groove appearance and increasing surface potential, making a new PP/PC membrane with high filtration performance. The resultant PP/PC membrane had finer average fiber diameter of 0.63 μm, which was nearly 89.41% lower than PP membranes (5.95 μm), and its quality factor (0.036 Pa−1) was nearly 2.12 times than that of PP membranes (0.017 Pa−1) with the die hole diameter of 0.5 mm. This fabrication technique of a special meltblown filter membrane saves the cost of die retrofitting and post-processing, which provides an innovative method for particulate efficient removal of high efficient filters.

Download Full-text

Design and Evaluation of Spinneret Module with Line-Type and Multi-Holes of Electro-Spun

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.311.243 ◽

2013 ◽

Vol 311 ◽

pp. 243-248

Author(s):

Wei Cheng Chu ◽

Chin Pan Huang ◽

Tien Wei Shyr ◽

Li Chou Chen ◽

Shu Ping Chiu

Keyword(s):

Pressure Drop ◽

Production Line ◽

Fiber Diameter ◽

Filtration Efficiency ◽

Gray Level ◽

Average Fiber Diameter ◽

Sampling Area ◽

Composite Nonwoven ◽

Line Type

For the wide application in the field of filtration and bio-medicine, the purpose of this study is to design a spinneret module of electro-spun which can produce composite nonwoven with sub-micrometer fiber continually. Applying the principle of melt-blown, a spinneret module with line-type and multi-holes which was assembled with small beads and filtering net, was designed. In order to construct a continual electro-spun production line, a traversal device was designed to control the traverse-motion of spinneret module for the even lapping and a stainless plate was adopted as collecting plate. In condition of 41KV working voltage, 0.3573 mL/min throughput and 42cm CSD (Capillary-Screen-Distance), a continual PEO nonwoven can be produced with average fiber diameter of 576nm and of CV% 13.4%. To a sampling area of 10cm×10cm and basis weight of 7.257 g/m2 electro-spun nonwoven, the CV% of gray level of its image is 2% and its filtration efficiency is up to 91.2% with pressure drop 13.8mm-H20 by TSI 8130 (32LPM, 5% NaCl).

Download Full-text

Electrospinning of Regenerated Silk Fibroin/Polybutylene Terephthalate Blended Mats and their Surface Wettability

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.531-532.531 ◽

2012 ◽

Vol 531-532 ◽

pp. 531-534

Author(s):

Yun Qian Cao ◽

Qin Fei Ke ◽

Xiang Yu Jin ◽

Sha Sha Guo

Keyword(s):

Silk Fibroin ◽

Fiber Diameter ◽

Contact Angles ◽

Surface Wettability ◽

Electrospun Fibers ◽

Average Fiber Diameter ◽

Polybutylene Terephthalate ◽

Regenerated Silk Fibroin ◽

Electrospinning Method ◽

Nanofiber Membranes

In this paper, regenerated silk fibroin/polybutylene terephthalate blended mats were prepared using electrospinning method with different blending ratios. The influence of regenerated silk fibroin/polybutylene terephthalate ratio on the morphology behaviors, fiber diameter and the surface wettability of the blended mats were studied. The morphology of the electrospun fibers were characterized by SEM. The average fiber diameter and its distribution can be obtained from the SEM pictures using software Image J. The average fiber diameter was 280nm to 486nm and it changed with the blending ratio. The contact angles and penetration times were used to characterize the surface wettability of the nanofiber membranes. It was found that with the increase of regenerated silk fibroin amount, the surface contact angles and penetration times decreased, which meant that the wettability was greatly improved.

Download Full-text