Microdenier

A selection of fiber property data is given ia Table 2 as an illustration of the range of fiber properties available commercially for use ia manufacturiag nonwoven fabrics. In general, fiber diameters range from 5 to >40 p.m for natural fibers, and from less than 10 p.m (microdenier) to as high as needed for manufactured fibers. 

Microdenier nylon and polyester were a significant spinning breakthrough when demonstrated in 1985. The finer-than-silk fibers added a new dimension to fabric aesthetics, comfort, and performance. Microdenier nylons are used in weaving, warp knits, and weft knits for sports-, leisure-, and... 

Microdenier fibers - [POLYAMIDES - FIBERS] (Vol 19) - [HIGH PERFORMANCE FIBERS] (Vol 13)... 

An extreme example of the microdenier-size fibers discussed above is the nanofibers that are one or more orders of magnitude smaller in diameter. The fiber with diameter at submicron or nanometer level is spun by a process known as electrospinning, in which the fiber is spun in a field involving high electrostatic forces.35... 

Microdenier Fibers. The first commercial production of microfiber in the United States was in 1989 by the DuPont Company. Today microfibers are produced in a variety of synthetic fibers (i.e., polyester, nylon, acrylic, etc.) A microfiber is a fiber that is less than one denier per filament. Yams made from microdenier filaments are able to give silklike hand to fabrics. 

Microfibers Also known as microdenier fibers. These are fibers having less than 1 denier per filament (or less than 0.11 tex per filament). Fabrics made of such microfibers have superior silk-like handle and dense construction. They find applications in stretch fabrics, lingerie, rain wear, etc. 

Mkrofiber or microdenier fiber has become important in the fashion industry. The reason for this is the fine size of microfiber. It is finer than any natural textile fiber such as silk, wool, etc. Microfibers are nothing but polyester fibers with diameter <5 xm (or less than 1 den). Such fineness allows more filaments to be packed in the yarn. Fabrics using such tightly bundled filaments are said to have a buttery texture like velour or washed silk. They also have the desirable characteristics of polyester, namely wrinkle-resistance and durability. Such fabrics are used in men s wear, women s wear, rainwear, active wear and home furnishings. 

Fractional deniers from 0.50 to 0.90 dpf for socks and knit fashions, both 100% acrylic and in blends with cotton, wool, and rayon, are provided in the United States by Cytec, and by other companies in Europe and Japan. Microdeniers in the 0.05-0.10 dpf range are produced for suede and silk-like fabrics. 

Sulfonated Polyesters may be also used for water-dispersible fibers (63). The fibers contain a single or a blend of a sulfopoly-ester with a water-dispersible polymer. The multicomponent fibers can be used to produce microdenier fibers. The biodegradability of the polymers have been assessed by the ASTM Standard Method D6340-98 (64). 

Microdenier Refers to fibers having less than 1 denier per filament or 0.1 tex per filament. 

Innovative structures covering different cross-sectional shapes, including hollow, and different sizes, including microdenier or micrometer, or even smaller than this in diameter, could be developed in manufactured fibers. By co-polymerizing, the chemistries of two different monomer compounds could be combined to form a polymer chain with new properties. Likewise, two different polymers could be co-extruded through the same orifice to form an alloy or a bicomponent fiber. These are, therefore, truly synthetic fibers, which cover a broad range of sizes and shapes and a very wide range of mechanical and physical properties. 

Micrographs showing a meltblown microdenier fibers layer sandwiched between two spun-bonded regular denier fiber layers (a) top view and (b) cross-section showing details of the embedded structure. 

As to the fabric specific surface area, it is defined as the ratio of the lateral surface area of the filaments involved in the weave to the fabric surface area (cm /cm ). The value of this parameter will be greater with microdenier filament yarn than with macrodenier filament yarn. 

The results clearly show that the microdenier filament yarn, as compared to the coarse denier filament yarn, underwent faster and greater structural rearrangement, and ended up with lower final stiffness due to internal friction. This result is important. If we divide the final friction stiffness values by the number of filaments involved in the 5 mm width of the two structures... 

Microdenier filament yams, 506 microfibre nonwoven, 43-4 electrospun nanofibre nonwoven web, 43... 

Microdenier. In the late 1980s, producers of polyester introduced microdenier products, that offered softer, more luxuriant handle to fabrics. Some acrylic producers have followed. There are no appreciable technical hurdles to producing a fiber with a denier of0.6-0.9 (0.66-1.00 dtex), bnt unless commensurate changes are made in line speed or the nnmber of spinneret holes, productivity will suffer Acrylic microfibers on the market are all staple products, with Sterling in the United States producing a 0.8 dpf acrylic staple product named MicroSupreme and Solutia a 0.95 dpf prodnct called Ginny. Mitsubishi Rayon offers H-129 (1.0 dtex). 

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