Abstract: An antibacterial twisted yarn including a first fiber and a second fiber having a shorter length than the first fiber and twisted together with the first fiber, wherein at least one of the first fiber and the second fiber includes a piezoelectric fiber that generates a charge by application of external energy.

Abstract: An antibacterial mask that includes a filter portion having a first layer and a second layer, wherein the first layer includes a plurality of first piezoelectric yarns that generate at least a first charge by stretching, and the second layer is formed of an ordinary cloth and positioned on a user side of the antibacterial mask.

Abstract: A knitted fabric structure that includes a piezoelectric yarn having a piezoelectric material that produces a surface potential by input of an external force from an outside of the piezoelectric yarn; and an elastic yarn having stretchability knitted together with the piezoelectric yarn, wherein the piezoelectric yarn has a mixing ratio of 5% or more based on a whole of the knitted fabric structure.

Abstract: A fabric that includes a loop of a yarn including a voltage generating filament. The fabric has a value of X of 1,000 or more, where X=(A+B)×C×D×E, and wherein: A is a loop angle of the loop of the yarn when the fabric is stretched by 10%, B is a connection angle of the loop of the yarn when the fabric is stretched by 10%, C is a number of the loops of the yarn per 1 cm2 of the fabric, D is a force (N) applied per basis weight (g/m2) of the fabric, and E is a surface potential (V) of the yarn.

Abstract: A method for producing a sheet having nanofibers that contain a piezoelectric polymer material. The method including dissolving a piezoelectric polymer material into a solvent so as to prepare a spinning solution; preheating a target board before nanofibers are formed by electrospinning the spinning solution; and, after the heating of the target board, receiving the nanofibers formed by electrospinning onto the heated target board so as to form the nanofibers into a sheet on the heated target board.

Abstract: A mask that exhibits a more improved antibacterial effect by more efficiently expanding and contracting a body of the mask in the periphery of the nose and mouth area of the mask without using a drug such as an antibacterial agent and/or an antiviral agent. The mask includes: a body including a yarn having a potential generating filament; and at least one dart that extends from an edge portion of the body towards a central portion of the body.

Abstract: A mask for covering at least a nostril and a mouth of a wearer. The mask includes a main body portion and an ear hooking portion attached to the main body portion. At least a part of the main body portion has a sheet-like piezoelectric portion, and the piezoelectric portion includes a yarn formed of an electric field forming filament.

Abstract: A yarn containing a potential-generating filament. The yarn is constructed such that a positive or negative surface electrical potential is generated by applying an external force to the yarn in an axial direction of the yarn, and constructed such that a controlled surface electrical potential is generated by a maintenance or release of the external force.

Abstract: A resin structure that includes a plurality of piezoelectric fibers that generate a charge by application of external energy; and an insulating resin coating at least one of the plurality of piezoelectric fibers.

Abstract: A yarn containing a plurality of potential-generating filaments. The yarn is characterized in that the plurality of potential-generating filaments are constructed such that the yarn has a specific permittivity of 4.5 or less. In a specific configuration, the plurality of potential-generating filaments are constructed such that the distance between the potential-generating filaments is about 0 ?m to about 10 ?m. Also provided is a fabric that contains the yarn.

Abstract: An antibacterial device that includes a substrate, a first electrode on the substrate, a second electrode on the substrate, and a protective layer covering the first electrode and the second electrode and having a first surface opposing of the substrate and a second surface opposite the first surface. Further, the first electrode and the second electrode are arranged such that the protective layer has an electric field strength on the second surface thereof of 150 kV/m or more when a voltage is applied to the first electrode or the second electrode.

Abstract: A spun yarn that includes at least a first short fiber that is a piezoelectric fiber that generates a potential by applied external energy, and that has a length of 800 mm or less. The spun yarn preferably includes a plurality of short fibers that are twisted together with each other.

Abstract: An antibacterial yarn that includes a core yarn including a functional polymer that generates a charge by external energy and a first sheath yarn higher in hygroscopicity than the core yarn, the first sheath yarn covering at least a part of a periphery of the core yarn across an axial direction of the core yarn.

Abstract: A yarn that includes a fiber that generates a potential on a surface thereof by energy from the outside; and a grounded conductive core material covered with the fiber. The yarn generates a potential of 0.1 V or more on a surface thereof when measured under the following conditions: the yarn is stretched by a predetermined amount in a uniaxial direction; and the potential is measured with an electric force microscope.

Abstract: An antibacterial mask that includes a filter portion having a first layer and a second layer, and at least one of the first layer and the second layer include a plurality of first piezoelectric yarns that generate at least a first charge by stretching.

Abstract: An antibacterial mask that includes a filter portion having a first principal surface and a second principal surface opposite the first principal surface, the filter portion including a plurality of first piezoelectric yarns that generate at least a first charge by stretching.

Abstract: A piezoelectric fiber composite that includes a substrate having a first expansion and contraction rate, a piezoelectric fiber assembly having piezoelectric fibers that generate electrical charges upon application of external energy and has a second expansion and contraction rate different from the first expansion and contraction rate of the substrate, and a joint portion that joins the substrate and the piezoelectric fiber assembly.

Abstract: An antibacterial twisted yarn including a first fiber and a second fiber having a shorter length than the first fiber and twisted together with the first fiber, wherein at least one of the first fiber and the second fiber includes a piezoelectric fiber that generates a charge by application of external energy.

Abstract: A resin structure that includes a plurality of piezoelectric fibers that generate a charge by application of external energy; and an insulating resin coating at least one of the plurality of piezoelectric fibers.

Abstract: An antibacterial device that includes a substrate, a first electrode on the substrate, a second electrode on the substrate, and a protective layer covering the first electrode and the second electrode and having a first surface opposing of the substrate and a second surface opposite the first surface. Further, the first electrode and the second electrode are arranged such that the protective layer has an electric field strength on the second surface thereof of 150 kV/m or more when a voltage is applied to the first electrode or the second electrode.