An article of apparel includes a multilayered knit fabric structure. The knit fabric structure includes a first knit layer and a second knit layer, and a resilient intermediate knit layer disposed between and coupling with the first knit layer and the second knit layer. The intermediate knit layer has a corrugated shape along a first direction of the intermediate knit layer with consecutive peaks that are oriented in opposing directions such that the peaks comprise a set of first peaks oriented in a first peak direction and a set of second peaks oriented in a second peak direction that opposes the first peak direction. The first peaks of the intermediate knit layer connect with the first knit layer and the second peaks of the intermediate knit layer connect with the second knit layer.

The present disclosure relates to an elastic fiber, an elastic fiber covered yarn and reeling manufacturing methods thereof The reeling manufacturing method of an elastic fiber includes: providing an elastic fiber material, the elastic fiber material having a core portion and a skin portion, the skin portion covering the core portion; performing a first extending, to have the elastic fiber material passing a first guiding roller, the speed of the first guiding roller being 500-1500 m/min; performing a second extending, to have the elastic fiber material passing a second guiding roller, the speed of the second guiding roller being 1200-2400 m/min; and performing a third extending, to have the elastic fiber material passing a third guiding roller, the speed of the third guiding roller is 1300-2600 m/min.

The present disclosure relates to an elastic fiber, an elastic fiber covered yarn and reeling manufacturing methods thereof The reeling manufacturing method of an elastic fiber includes: providing an elastic fiber material, the elastic fiber material having a core portion and a skin portion, the skin portion covering the core portion; performing a first extending, to have the elastic fiber material passing a first guiding roller, the speed of the first guiding roller being 500-1500 m/min; performing a second extending, to have the elastic fiber material passing a second guiding roller, the speed of the second guiding roller being 1200-2400 m/min; and performing a third extending, to have the elastic fiber material passing a third guiding roller, the speed of the third guiding roller is 1300-2600 m/min.

Systems, methods, and structures that provide distributed acoustic sensing using chirped optical pulses of selectable duration and bandwidth, at a frame rate limited by a round-trip propagation time of a fiber under test. Instead of processing a transmitted chirped pulse as a single sequence—our systems, methods, and structures employ a parallel fragmented multiband architecture, where each tributary correlates the received signal with a truncated chirped pulse to obtain the Rayleigh impulse response over its frequency band. By reducing the duration of the chirp processed by each tributary, spatial leakage is reduced at all the tributaries, thus even after combining all the interferometric products from all tributaries using a rotated vector sum, the resultant signal is much less impacted by spatial leakage than by using a conventional TGD-OFDR method.

A method of generating a coiled actuator fiber that includes twisting a fiber to generate a twisted fiber; wrapping the twisted fiber around a core yarn or fiber to generate a coil in the twisted fiber, which generates a coiled twisted fiber; setting the coiled twisted fiber by heat or chemical treatment; and removing at least a portion of the core yarn or fiber to generate a coiled actuator fiber.

Flame resistant fabrics formed with a combination of body yarns and stretch yarns that exhibit excellent physical and thermal properties. The body yarns are formed at least in part with flame resistant materials. The stretch yarns are corespun yarns having an elastic core surrounded by a fiber sheath formed at least in part with flame resistant materials. The fiber sheath protects the elastic core from direct exposure to heat and flame that would otherwise cause the core to degrade or melt.

Flame resistant fabrics formed with a combination of body yarns and stretch yarns that exhibit excellent physical and thermal properties. The body yarns are formed at least in part with flame resistant materials. The stretch yarns are corespun yarns having an elastic core surrounded by a fiber sheath formed at least in part with flame resistant materials. The fiber sheath protects the elastic core from direct exposure to heat and flame that would otherwise cause the core to degrade or melt.

A method of loading a carding machine for the manufacture of yarn. The method includes deriving a component load schedule with a plurality of discrete loading steps. The series of discrete loading steps comprise at least a first load amount and a second load amount, wherein the sum of the first load amount and the second load amount is a first overall load amount. The method includes loading a first amount of a first component equal to the first load amount of a discrete loading step, loading a second amount of a second component equal to the second load amount of the discrete loading step and repeating the steps of loading a first amount and loading a second amount for each of the discrete loading steps.

A method of loading a carding machine for the manufacture of yarn. The method includes deriving a component load schedule with a plurality of discrete loading steps. The series of discrete loading steps comprise at least a first load amount and a second load amount, wherein the sum of the first load amount and the second load amount is a first overall load amount. The method includes loading a first amount of a first component equal to the first load amount of a discrete loading step, loading a second amount of a second component equal to the second load amount of the discrete loading step and repeating the steps of loading a first amount and loading a second amount for each of the discrete loading steps.

A filamentary core for an elastic composite yarn, particularly for an elastic textile composite yarn, comprising at least two elastic performance filaments, wherein each of the at least two elastic performance filaments is capable of being stretched at least about 2 times its package length and has at least 90% up to 100% elastic recovery after having being released from a stretching 2 times its package length.