Method and Apparatus for Making an Improved High Surface Area Fiber
a technology of high surface area and fibers, applied in the field of high surface area fibers and textiles, can solve the problems of limiting the use of 4dg fibers and other fibers having a similar configuration, restricting their potential applications, and limiting their use in certain applications, so as to achieve high surface area and high surface area
Inactive Publication Date: 2012-06-14
ALLASSO IND +1
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- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Benefits of technology
The resulting fiber achieves a specific surface area at least 80,000 square centimeters per gram, enabling effective absorption and filtration, particularly in nano-filtration and micro-absorption applications, with improved processability and reduced interlocking, thus expanding its potential uses in woven and non-woven applications.
Problems solved by technology
Additionally, the prior art fiber of FIG. 1 has a large denier which limits its use in certain applications for which nano-fibers are required.
However, there are several disadvantages to the 4DG fiber and other fibers having a similar configuration.
Many such fibers cannot be spun to fiber diameters less than about 50 to 60 microns, thereby restricting their potential applications.
Furthermore, due to the large grooves between the arms of the fiber, the arms often break during the spinning process.
Such fibers have a limited number of arms and grooves resulting in a relatively low surface to volume ratio, which restricts the amount of fluid that can be absorbed.
Finally, due to the size and geometry of the 4DG fiber, the arms can easily interlock during fabric formation resulting in dense and compressed materials, which diminishes its filtration and absorption properties.
However, because of the deep grooves or arms of the fibers, the fibers cannot be made into normal fiber sizes that are preferred and used by the industry.
Fibers with deniers of 6 or larger are extremely coarse, more difficult to process, and are therefore, limited in their use.
One problem with single component round fibers is that in order to increase the surface area of the fiber per mass, the cross-sectional area also has to be reduced, requiring significant reduction in diameter to produce higher surface areas.
Method used
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[0025]In the following description, like reference characters designate like or corresponding parts throughout the several views. Also in the following description, it is to be understood that such terms as “forward,”“rearward,”“front,”“back,”“right,”“left,”“upwardly,”“downwardly,” and the like are words of convenience and are not to be construed as limiting terms. Referring now to the drawings in general, the illustrations are for the purpose of describing a preferred embodiment of the invention and are not intended to limit the invention thereto.
[0026]Referring to the drawings, FIGS. 2-4 disclose a cross-section of the fiber of the present invention generally designated by the reference numeral 10. As shown in FIG. 2, the fiber 10 generally comprises an internal fiber 12 and an external sheath 14. The fiber 10 is generally constructed from two different polymer compositions that can be extruded in an oval cross-section, which allows for high processability. Alternatively, the cros...
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Abstract
The present invention is directed to a high surface area fiber and method for making the same. The fiber includes a co-extruded internal fiber and an external sheath that is washed with a solvent to remove the dissolvable external sheath, the resulting fiber having a longitudinal axis and a cross-section, the cross-section having a middle region and projections extending from the middle region.
Description
CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This is a divisional application filed from U.S. patent application Ser. No. 11 / 592,370 filed Nov. 3, 2006, which is incorporated herein by reference.DESCRIPTION[0002]1. Field of the Invention[0003]The present invention relates generally to high surface area fibers and textiles made from the same. Further, the present invention relates to high surface area fibers made from a bicomponent fiber extrusion process.[0004]2. Description of the Prior Art[0005]Fibers capable of absorbing and filtering liquids or particles are known in the art. Fiber surfaces are often treated chemically or physically to enhance their ability to hold liquids or particles. For instance, in order to increase the surface area of a fiber the surfaces are made rough to create grooves and channels. Some absorbent fibers known in the art are treated with hydrophobic or hydrophilic chemicals, which affects fluid flow.[0006]One such fiber that is used for absorption is the...
Claims
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IPC IPC(8): D02G3/00D01D5/08D01F11/00D01D10/06D04H1/4374D04H1/544D04H1/549D04H1/55D04H1/555D04H1/559D04H1/593D04H1/728D04H3/16
CPCB01D39/02Y10T428/2913B29C65/08B29C65/18B29C65/48B29C66/729B29C66/83413B29K2021/003B29K2023/00B29K2023/06B29K2023/086B29K2023/12B29K2067/046B29K2071/00B29K2075/00B29K2077/00B29K2105/0854B29K2223/00B29K2223/06B29L2009/00B29L2031/14B32B5/26B32B17/02B32B17/067D01D5/0985D01D5/253D01D5/34D04H1/42D04H13/002D02G3/22D02G3/34D02G3/36Y10T428/2973Y10T428/2915Y10T428/2931Y10T428/2978Y10T428/2933Y10T428/2975Y10T428/2929Y10T428/2902Y10T428/298B01D39/04B29C66/7212B29C66/72143B29C66/73793B29C66/45B29C65/02D04H3/018B29C66/71B29C66/72326B29C66/7234B29C66/73161Y10T428/31786Y10T442/611Y10T442/614Y10T442/608Y10T442/659Y10T428/249921Y10T428/31725Y10T442/668Y10T442/68Y10T442/609Y10T442/3065Y10T442/626D04H1/43912D04H1/43914B29K2309/08B29K2067/00D01D5/30D10B2403/033
InventorPOURDEYHIMI, BEHNAMCHAPPAS, WALTER
OwnerALLASSO IND