An active fibre comprising material activated by an external stimulus, wherein the fibre has a first configuration in an unactivated state, and in response to activation by the external stimulus the fibre adopts a second, increased twist, configuration, relative to the first configuration, and wherein the fibre can reversibly move between the active state and the unactivated state.

It is provided that a pre-air-filter, for an internal combustion engine, which allows stiffness to be assured even when the weight is reduced, which also has excellent dust holding properties, and which has an excellent resistance to entry of water. A pre-air-filter for an internal combustion engine (1) contains a nonwoven fabric comprising a first fiber having a melting point of not lower than 80 C. and not higher than 200 C., a second fiber having a melting point of higher than the melting point of the first fiber by not less than 30 C., being crimped, and having a hollow structure, entanglement of the first fiber and the second fiber by needle punching, and fusion of partly or entirely melted first fiber and the second fiber. This pre-air-filter (1) is installed at an air-inlet-side of a main-air-filter (2).

Provided is a hyaluronate non-woven fabric made of hyaluronate fibers and a method of manufacturing the same. More particularly, the present invention relates to a highly functional hyaluronate non-woven fabric made of hyaluronate fibers having a rough surface and a micro-size diameter and a method of manufacturing the same. A hyaluronate non-woven fabric manufacturing method according to the present invention includes preparing hyaluronate fibers, treating the hyaluronate fibers to be curled, cutting the curled hyaluronate fibers, forming a hyaluronate web from the curled hyaluronate fibers, and needle-punching the hyaluronate web. The hyaluronate non-woven fabric of the present invention has a high hyaluronate content, is manufactured by needle punching high-strength hyaluronate fibers, and has excellent adhesion and tensile strength. Therefore, the hyaluronate non-woven fabric of the present invention can be used as a mask pack for external application on the skin, a biomaterial for tissue repairing, and an anti-adhesion coating material.

This disclosure provides a fiber filling nonwoven, consisting essentially of at least one fiber web and first fiber balls. Parts of the first fiber balls are directly fixed on the at least one fiber web, and another parts of the first fiber balls are indirectly fixed on the at least one fiber through being fixed on the parts of the first fiber balls. The first fiber ball includes first hollow polyester fibers having a first crimp number and second hollow polyester fibers having a second crimp number, and the first polyester hollow fibers and the second polyester hollow fibers are inelastic hollow polyester fibers with an elastic elongation rate equal to less than 50%. A difference of the first and the second crimp number is in a range from 4 to 10. A compression resilience ratio of the fiber filling nonwoven is equal to or greater than 80%.

A thermally stable meltblown fibrous web, including a plurality of meltblown multilayer fibers, in which at least some of the meltblown multilayer fibers each include at least one primary layer that includes a primary polymer that is slow-crystallizing with a T.sub.m of at least about 200 C., and at least one secondary layer that includes a secondary polymer that is fast-crystallizing with a T.sub.m of at least about 200 C.

An object of the invention is to obtain spunbonded nonwoven fabrics including thin hollow fibers which have excellent lightweight properties and uniformity as well as exhibit high strength and flexibility. An aspect of the invention is directed to a spunbonded nonwoven fabric including hollow fibers of a propylene polymer, the hollow fibers satisfying the following requirements (a) to (c): (a) the C-axis orientation is at least 0.85, (b) the average fiber diameter is 5 to 20 m, and (c) the hollowness is 5 to 30%.

Use of polymer composition comprising a first propylene polymer A and a second propylene polymer B for producing crimped multicomponent fiber having a side by side cross-sectional configuration.

A nonwoven fabric includes a fiber including a first portion and a second portion connected to the first portion. A first fiber diameter of the first portion is smaller than a reference fiber diameter. A second fiber diameter of the second portion is equal to or greater than the reference fiber diameter. The reference fiber diameter is smaller than 1 m. A ratio of a maximum fiber diameter of the second portion to a length of a linear line connecting both end portions of the second portion is from 1/10 to 1/3.

The invention relates to nonwoven fabric sheets containing crimped multicomponent fibers.

Nonwoven fabrics are provided that include a plurality of crimped bicomponent fibers having a first component comprising a first polymeric material comprising a first polymer or a first polymeric blend and a second component comprising a second polymeric material, in which the second polymeric material comprises a second polymeric blend of (i) at least one polypropylene polymer, (ii) at least one polyethylene polymer, and (iii) at least one compatibilizer comprising or consisting of at least one polypropylene-polyethylene copolymer.