A nonwoven fabric formed of an olefin-based resin composition (I) containing an olefin-based polymer (i) satisfying specific requirements; a spunbond nonwoven fabric obtained by melt-extruding and molding the olefin-based resin composition (I) at a resin temperature of 220 C. or lower, and a method for producing it; a multilayer nonwoven fabric containing the spunbond nonwoven fabric; a nonwoven fabric and a multilayer nonwoven fabric including composite fibers containing an olefin-based resin composition (II) containing an olefin-based polymer (ii) satisfying specific requirements; and a fiber product using the spunbond nonwoven fabric, the nonwoven fabric of composite fibers, or the multilayer nonwoven fabric.

A melt blowing system for the manufacturing of pleatable/moldable nonwoven fabrics includes a collector positioned to receive a plurality of fibers, a first die in fluid communication with a first liquid polymer supply having a melt flow index of about 500 or lower, and a second die in fluid communication with a second liquid polymer supply having a melt flow index of about 500 or higher. The first die has a concentric air design, includes a plurality of spinneret nozzles facing the collector surface, and is configured to draw a first plurality of fibers. The second die includes a plurality of spinneret nozzles having smaller capillary diameter than those of the first die and is positioned to draw a second plurality of fibers such that the first and second pluralities of fibers form a co-mingled nonwoven web with varying fiber diameters on the collector surface.

A melt blowing system for the manufacturing of pleatable/moldable nonwoven fabrics includes a collector positioned to receive a plurality of fibers, a first die in fluid communication with a first liquid polymer supply having a melt flow index of about 500 or lower, and a second die in fluid communication with a second liquid polymer supply having a melt flow index of about 500 or higher. The first die has a concentric air design, includes a plurality of spinneret nozzles facing the collector surface, and is configured to draw a first plurality of fibers. The second die includes a plurality of spinneret nozzles having smaller capillary diameter than those of the first die and is positioned to draw a second plurality of fibers such that the first and second pluralities of fibers form a co-mingled nonwoven web with varying fiber diameters on the collector surface.

A nonwoven substrate comprising a polyolefin and an engineering thermoplastic polymer. The engineering thermoplastic polymer may be present in the nonwoven substrate at a level of between about 1% and about 20% by weight of the nonwoven substrate. The layer of fibers is free of a compatibilizer.

A nonwoven substrate comprising a polyolefin and an engineering thermoplastic polymer. The engineering thermoplastic polymer may be present in the nonwoven substrate at a level of between about 1% and about 20% by weight of the nonwoven substrate. The layer of fibers is free of a compatibilizer.

Electret webs include a thermoplastic resin and a charge-enhancing additive. The charge-enhancing additive is a fused aromatic thiourea, a fused aromatic urea compound, or a combination thereof. The change-enhancing additive may also include a hindered amine light stabilizer compound. The electret webs may be a non-woven fibrous web or a film. The electret webs are suitable for use as filter media.

Electret webs include a thermoplastic resin and a charge-enhancing additive. The charge-enhancing additive is a fused aromatic thiourea, a fused aromatic urea compound, or a combination thereof. The change-enhancing additive may also include a hindered amine light stabilizer compound. The electret webs may be a non-woven fibrous web or a film. The electret webs are suitable for use as filter media.

Dimensionally stable nonwoven fibrous webs include a multiplicity of continuous fibers formed from one or more thermoplastic polyesters and polypropylene in an amount greater than 0% and no more than 10% by weight of the web. The webs have at least one dimension which decreases by no greater than 10% in the plane of the web when heated to a temperature above a glass transition temperature of the fibers. When the thermoplastic polyester is selected to include aliphatic and aromatic polyesters, a spunbond process may be used to produce substantially continuous fibers that exhibit molecular orientation. When the thermoplastic polyester is selected from aliphatic polyesters, a meltblown process may be used to produce discontinuous fibers that do not exhibit molecular orientation. The webs may be used as articles for filtration, sound absorption, thermal insulation, surface cleaning, cellular growth support, drug delivery, personal hygiene, medical apparel, or wound dressing.

Dimensionally stable nonwoven fibrous webs include a multiplicity of continuous fibers formed from one or more thermoplastic polyesters and polypropylene in an amount greater than 0% and no more than 10% by weight of the web. The webs have at least one dimension which decreases by no greater than 10% in the plane of the web when heated to a temperature above a glass transition temperature of the fibers. When the thermoplastic polyester is selected to include aliphatic and aromatic polyesters, a spunbond process may be used to produce substantially continuous fibers that exhibit molecular orientation. When the thermoplastic polyester is selected from aliphatic polyesters, a meltblown process may be used to produce discontinuous fibers that do not exhibit molecular orientation. The webs may be used as articles for filtration, sound absorption, thermal insulation, surface cleaning, cellular growth support, drug delivery, personal hygiene, medical apparel, or wound dressing.

The present invention relates to a light safety shoe (1), comprising:an upper (2); a sole (3) made by means of injection molding directly onto said upper (2); a safety toecap (4) placed at the toe of the shoe (1);a anti-puncture sheet (9) housed in said sole (3);a functional insert (7) placed within said sole (3), below said anti-puncture sheet (9). According to the invention, the light safety shoe (1) has, with reference to a European size 42, a weight lower or equal to 400 grams.