Relationships between the Properties of Fibres and Thermally Bonded Nonwoven Fabrics Made of Polypropylene
| Title |
Relationships between the Properties of Fibres and Thermally Bonded Nonwoven Fabrics Made of Polypropylene |
| Publication year |
1995 |
| General note |
DOI 10.1002/app.1995.070580926 |
| Language |
English |
| Author |
Andreassen, Erik |
| Co-Authors |
Grøstad, Kristin - Hinrichsen, Einar L. - Braathen, Marianne Dale - Myhre, Ole Jan (Norner) |
| Source |
Journal of Applied Polymer Science, 58 (9), 1995, 1633-1645 |
| Abstract |
Typical polypropylene fibres for use in light nonwoven fabrics were produced in a full-scale compact-spinning line. Molecular weight distribution (MWD), extrusion temperature, draw-down ratio and draw ratio were varied. The fibres were thermally bonded (welded) into nonwoven fabrics, at different bonding temperatures, using a pilot calender line. The tensile properties of the fabrics are influenced by the MWD and the processing conditions of the fibres, and the effects of these fibre parameters increase with increasing bonding temperature. The fabric strength increases with increasing Mw/Mn, decreasing draw ratio and increasing extrusion temperature, while in all these cases the fibre strength generally follows the opposite trend. Furthermore, the fabric strength, as well as the fibre strength, has a maximum as a function of draw-down ratio. The tensile properties of the fabrics seem to be governed by the bonding properties of the constituent fibres, not the fibre strength per se. Bond characteristics are discussed in terms of skin-core structures. Some details of the macroscopic fracture mechanisms of fabrics were revealed by scanning electron microscopy and the shape of load-elongation curves |