发明名称 |
Dimensionally stable bonded nonwoven fibrous webs |
摘要 |
A method for making a bonded nonwoven fibrous web comprising extruding melt blown fibers of a polymeric material, collecting the melt blown fibers as an initial nonwoven fibrous web, annealing the initial nonwoven fibrous web with a controlled heating and cooling operation, and collecting the dimensionally stable bonded nonwoven fibrous web is described. The bonded nonwoven fibrous web shrinkage is typically less than 4 percent relative to the initial nonwoven fibrous web. |
申请公布号 |
US8802002(B2) |
申请公布日期 |
2014.08.12 |
申请号 |
US200611617274 |
申请日期 |
2006.12.28 |
申请人 |
3M Innovative Properties Company |
发明人 |
Berrigan Michael R.;Stelter John D.;Ebbens Ruth A.;Fennessey Sian F. |
分类号 |
D01D5/08 |
主分类号 |
D01D5/08 |
代理机构 |
|
代理人 |
Baker James A.;Bronk John M. |
主权项 |
1. A method for making a bonded nonwoven fibrous web comprising the sequential steps:
a) extruding melt blown fibers comprising a polymeric material; b) collecting the melt blown fibers as an initial unbonded nonwoven fibrous web, wherein the fibers are substantially free of strain induced crystallization; c) annealing the initial unbonded nonwoven fibrous web with a controlled heating and cooling operation comprising:
i) heating through the initial unbonded nonwoven fibrous web by forcefully passing through the initial unbonded nonwoven fibrous web a first fluid having a temperature above a cold crystallization temperature (Tcc) of the polymeric material of step a) to decrease the orientation of amorphous regions of the melt blown fibers, thereby providing a bonded nonwoven fibrous web; andii) cooling through the bonded nonwoven fibrous web by drawing a second fluid having a temperature below a glass transition temperature (Tg) of the polymeric material of step a) over and through the bonded nonwoven fibrous web to retain the amorphous regions of the melt blown fibers providing a cooled bonded nonwoven fibrous web; and d) collecting the cooled bonded nonwoven fibrous web providing a dimensionally stable bonded nonwoven fibrous web; wherein the melt blown fibers of the cooled bonded nonwoven fibrous web retain a substantial cold crystallization exotherm. |
地址 |
St. Paul MN US |