Kuraray Specialty Fibers

Engineered Fibers Technology is pleased to be able to introduce and supply several fibers recently developed by Kuraray. These fibers offer significant new opportunities for the development or modification of specialty papers and nonwovens.

We are presenting both new chemistry in the form of EVOH fibers, specialty polyamide, and high modulus PVA fibers as well as new fiber architectures in the form of a “striped” bicomponent polyester/ nylon splittable fiber, in addition to a flat (ribbon shaped) fiber. These fibers are now available for your evaluations.

These new fibers offer several advantages, including high thermal binding efficiency, high mechanical performance and FDA approval.

An overview of these fibers is given below, and individual data sheets can be provided upon request. If you have interest in these new fibers, or the other PVA and polyester specialty fibers available from Kuraray through EFT, please contact us.

Synthetic Fiber Spun from Ethylene Vinyl Alcohol (EVOH)

EVOH fiber is the first synthetic fiber containing hydrophilic radicals. It can used as a thermal binder fiber for both dry laid and wet-laid applications without the need for calendering, and is available in short-cut fiber form both as a homopolymer, or as a sheath /core bicomponent fiber. Binding efficiency is higher in wet-laid applications than PVA binder fibers, and significantly superior to PET and other thermal binder fibers in all production methods. The melting points under dry and wet conditions are 170°C and 100°C respectively. Due to the presence of hydrophilic radials, water is absorbed on the surface of EVOH fiber. EVOH polymer is FDA approved for food contact under 21 CFR 177.1360, and FDA approved fiber finishes are being evaluated.

Applications of papers / nonwovens made from EVOH include air and liquid filtration media, heat sealable paper, food wrapping papers, wipes and various kinds of paper for cosmetics, hygiene, medical and electrical uses.

WRAMP fiber

WRAMP fiber cross-section

Polyester / Nylon Splittable Fiber (WRAMP)

WRAMP fiber is a bicomponent fiber with a stacked structure consisting of eleven alternating layers or “stripes” of polyester and nylon. Mild refining of this fiber causes it to split into approximately 0.3 microdenier ribbon shaped fibers. Papers made from WRAMP fiber, or blends with wood pulp, exhibit very high tear factor, low air permeability, smaller pore size, high luster, good printability and high fold endurance. Applications include wipes, decorative printed papers for high pressure laminates and wall coverings.

Ribbon-shaped PVA Fibers (BFH)

New PVA fibers have been developed with a flat cross section having cross-sectional aspect ratios (thickness / width) of 1/6 to 1/20, with an equivalent (circular cross-section) denier of about 1 to 5. They are available both as thermal binder fibers, with dissolution temperatures of 60°C, and as conventional short-cut fibers, which do not dissolve below 100°C. Because of the flat cross section of these fibers, binding efficiency is much higher than with round PVA fibers resulting in higher strength, or requiring a lower percentage to achieve equivalent strength. Lower air permeability papers can also be produced. Applications of ribbon shaped PVA fibers include all the applications of conventional circular cross-section PVA fibers where strength improvements are desirable, as well as new applications utilizing the ribbon shape.

High Modulus PVA Fiber (REC)

Specialty PVA fibers that have specific strength and specific modulus higher than fiberglass are now being produced using Kuralon K-2 spinning technology. These fibers are available in 15 and 90 denier sizes.

Specialty Polyamide Fiber (A590)

New nylon chemistry has been employed to produce a unique half-aromatic polyamide fiber that has excellent chemical resistance and a melting temperature of 265°C. In addition to being available in 0.6 and 1.5 denier, a 0.07 microdenier fiber can be supplied.

Data Sheet:

Other Specialty Fibers: