[직/편성물 염색] Fibrous Structures with Designed Wicking Properties 출판일 : 2007.04.01 저자 : Esra Coskuntuna, Alex J. Fowler, Steven B. Warner 서지사항 : Textile Research Journal, Volume 77, Issue 4, 256페이지 등록일 : 2011.11.04 I 조회수 : 95 작성자 : admin |
Fibrous structures have been designed and tested to achieve anisotropic flow properties. A
structure that transports liquid in one specific in-plane direction as fast as possible was
formed by parallel arrangement of continuous filament yarns in the middle layer of a three-
layer structure. The top and bottom layers consisted of low areal density nonwoven fabrics.
Tests showed that flow was faster in the middle layer, yielding a nonuniform flow front
among the layers. Structures with larger pores in the middle layer wicked faster, as
anticipated from the Washburn equation. Although we maximized the in-plane orientation to
increase the flow anisotropy of the structures, the flow anisotropy was only approximately 3,
which can be usefully compared to a mechanical anisotropy of the structure of perhaps 50
or higher. A mathematical expression derived from combining the continuity equation with
Darcy's Law was used to model the flow behavior in these structures. The predicted values
of the flow front were within 20% of the experimental values. Another structure was
designed to maximize liquid transport through the thickness of a fabric. It contained flocked
fibers in the middle layer oriented parallel to the direction of flow. Structures with single and
double layers of flocked fibers with varying fiber denier and flock density were made and
tested. The number of layers, the fiber denier and the interaction between the number of
layers and flock density influenced the transverse flow behavior of these structures. Single
layer samples with high-flock density and high fiber denier promoted transverse flow best.
Double layer high-flock density samples hindered the transverse flow, retaining the liquid in
the middle region where the layers met to produce smaller pores.
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