A nonwoven web comprising a layer of polymeric fibers, wherein, based on the total number of polymeric fibers, at least 10% the polymeric fibers in said layer are coarse fibers having a fiber diameter of 4 μm or more, and at least 10% of the polymeric fibers in said layer are fine fibers having a fiber diameter of 2 μm or less. Also described herein is a method for making the nonwoven web, comprising melt-blowing a polymer mixture comprising two immiscible or partially miscible polymers.

A nonwoven web comprising a layer of polymeric fibers, wherein, based on the total number of polymeric fibers, at least 10% the polymeric fibers in said layer are coarse fibers having a fiber diameter of 4 μm or more, and at least 10% of the polymeric fibers in said layer are fine fibers having a fiber diameter of 2 μm or less. Also described herein is a method for making the nonwoven web, comprising melt-blowing a polymer mixture comprising two immiscible or partially miscible polymers.

A masterbatch is disclosed, along with associated methods, and biodegradable filaments, fibers, yarns and fabrics. The masterbatch includes 0.2 to 5 mass % CaCO.sub.3, an aliphatic polyester with a repeat unit having from two to six carbons in the chain between ester groups, with the proviso that the 2 to 6 carbons in the chain do not include side chain carbons, and a carrier polymer selected from the group consisting of PET, nylon, other thermoplastic polymers, and combinations thereof.

A masterbatch is disclosed, along with associated methods, and biodegradable filaments, fibers, yarns and fabrics. The masterbatch includes 0.2 to 5 mass % CaCO.sub.3, an aliphatic polyester with a repeat unit having from two to six carbons in the chain between ester groups, with the proviso that the 2 to 6 carbons in the chain do not include side chain carbons, and a carrier polymer selected from the group consisting of PET, nylon, other thermoplastic polymers, and combinations thereof.

Described herein is an acoustic building panel comprising: a body comprising a fibrous material and having a first major surface opposite a second major surface and a side surface extending there-between, the fibrous material comprising polyester fiber in an amount of at least 70 wt. % based on the total weight of the fibrous material; wherein the body has a bulk density as measured between the first major surface, the second major surface, and the side surface, the bulk density ranging from about 4.8 lb./ft.sup.3 to about 6.0 lb./ft.sup.3.

Described herein is an acoustic building panel comprising: a body comprising a fibrous material and having a first major surface opposite a second major surface and a side surface extending there-between, the fibrous material comprising polyester fiber in an amount of at least 70 wt. % based on the total weight of the fibrous material; wherein the body has a bulk density as measured between the first major surface, the second major surface, and the side surface, the bulk density ranging from about 4.8 lb./ft.sup.3 to about 6.0 lb./ft.sup.3.

A sound-absorbing material nonwoven fabric includes: 30 to 80 mass % of short fibers A having a fineness of 0.4 to 0.9 dtex; and 20 to 70 mass % of short fibers B having a fineness of 1.1 to 20.0 dtex. A carding passage coefficient of the short fibers A calculated from equation (1) is in a range of 15 to 260. The equation (1) is carding passage coefficient=(fineness×strength×√elongation percentage×√number of crimps×√crimping degree)/(fiber length).

A sound-absorbing material nonwoven fabric includes: 30 to 80 mass % of short fibers A having a fineness of 0.4 to 0.9 dtex; and 20 to 70 mass % of short fibers B having a fineness of 1.1 to 20.0 dtex. A carding passage coefficient of the short fibers A calculated from equation (1) is in a range of 15 to 260. The equation (1) is carding passage coefficient=(fineness×strength×√elongation percentage×√number of crimps×√crimping degree)/(fiber length).

Articles, such as sanitary tissue products, comprising fibrous structures, and more particularly articles comprising fibrous structures comprising a plurality of fibrous elements wherein the articles exhibit improved consumer relevant properties, for example improved bulk and absorbent properties, compared to known articles and methods for making same are provided.

Processes for making fibrous structures and more particularly processes for making fibrous structures comprising filaments are provided.