A partially separated fiber bundle includes a separated fiber section and an unseparated fiber section, being configured to give a ratio A.sub.max/A.sub.min of 1.1 or larger and 3 or smaller, when the number of fiber bundles contained in the width direction of the partially separated fiber bundle (fiber separating number: N.sub.n) measured at a freely selected point P.sub.n (where, n represents an integer of 1 to 100, and freely selected points P.sub.n and P.sub.n+1, excluding n=100, being 50 cm or more away from each other), is divided by a full width of W.sub.n of the partially separated fiber bundle, to calculate the fiber separating number per unit width A.sub.n, and assuming its maximum value as A.sub.max and its minimum value as A.sub.min.

A partially separated fiber bundle includes a separated fiber section and an unseparated fiber section, being configured to give a ratio A.sub.max/A.sub.min of 1.1 or larger and 3 or smaller, when the number of fiber bundles contained in the width direction of the partially separated fiber bundle (fiber separating number: N.sub.n) measured at a freely selected point P.sub.n (where, n represents an integer of 1 to 100, and freely selected points P.sub.n and P.sub.n+1, excluding n=100, being 50 cm or more away from each other), is divided by a full width of W.sub.n of the partially separated fiber bundle, to calculate the fiber separating number per unit width A.sub.n, and assuming its maximum value as A.sub.max and its minimum value as A.sub.min.

A method of producing an opened fiber bundle is in a space-saving manner. The method of continuously producing an opened fiber bundle for a cleaning member, includes the steps of (a.sub.1) providing (i) first nip rolls, (ii) second nip rolls, (iii) third nip rolls, and (iv) an air feeder; (a.sub.2) conveying a fiber bundle using the first nip rolls and the second nip rolls to apply a tensile force to the fiber bundle; (a.sub.3) conveying the fiber bundle using the second nip rolls and the third nip rolls to relax the fiber bundle, thereby forming a belt-shaped fiber bundle; and (a.sub.4) blowing air from the air feeder in a direction intersecting with the conveying direction of the first belt-shaped fiber bundle.

A production method for a separated fiber bundle includes at least: [A] a partial separation step for obtaining a partially separated fiber bundle in which separation-processed parts, each separated into a plurality of bundles, and not-separation-processed parts are alternately formed along the lengthwise direction of a fiber bundle comprising a plurality of single fibers; and [B] a cutting step for cutting the not-separation-processed parts of the partially separated fiber bundle formed in the step [A] along the lengthwise direction of the fiber bundle. A separated fiber bundle produced by the method, a fiber-reinforced resin molding material that uses the separated fiber bundle, and a production method for the fiber-reinforced resin molding material.

A production method for a separated fiber bundle includes at least: [A] a partial separation step for obtaining a partially separated fiber bundle in which separation-processed parts, each separated into a plurality of bundles, and not-separation-processed parts are alternately formed along the lengthwise direction of a fiber bundle comprising a plurality of single fibers; and [B] a cutting step for cutting the not-separation-processed parts of the partially separated fiber bundle formed in the step [A] along the lengthwise direction of the fiber bundle. A separated fiber bundle produced by the method, a fiber-reinforced resin molding material that uses the separated fiber bundle, and a production method for the fiber-reinforced resin molding material.

A method of reducing entanglement of wires includes receiving, at a tray, one or more first wires of a first wire group from a wire feed system of a wire processing machine. In addition, the method includes receiving, at the tray, one or more second wires of a second wire group from the wire feed system after receiving the first wire group at the tray. The method further includes physically separating, using a separator device associated with the tray, at least a portion of the first wire group from the second wire group. The method also includes moving the second wire group relative to the first wire group, reducing movement of at least a portion of the first wire group relative to a tray surface during movement of the second wire group relative to the first wire group.

A method of reducing entanglement of wires includes receiving, at a tray, one or more first wires of a first wire group from a wire feed system of a wire processing machine. In addition, the method includes receiving, at the tray, one or more second wires of a second wire group from the wire feed system after receiving the first wire group at the tray. The method further includes physically separating, using a separator device associated with the tray, at least a portion of the first wire group from the second wire group. The method also includes moving the second wire group relative to the first wire group, reducing movement of at least a portion of the first wire group relative to a tray surface during movement of the second wire group relative to the first wire group.

A method of reducing entanglement of wires includes receiving from a wire feed system of a wire processing machine a first wire on a tray surface providing a wire-to-surface coefficient of friction between the tray surface and the first wire. In addition, the method includes receiving from the wire feed system a second wire at least partially on top of the first wire, the wire-to-surface coefficient of friction being higher than a wire-to-wire coefficient of friction between the first wire and the second wire. The method also includes moving the second wire relative to the first wire, and reducing movement of at least a portion of the first wire relative to the tray surface during movement of the second wire relative to the first wire due to the wire-to-surface coefficient of friction being higher than the wire-to-wire coefficient of friction.

A method of reducing entanglement of wires includes receiving from a wire feed system of a wire processing machine a first wire on a tray surface providing a wire-to-surface coefficient of friction between the tray surface and the first wire. In addition, the method includes receiving from the wire feed system a second wire at least partially on top of the first wire, the wire-to-surface coefficient of friction being higher than a wire-to-wire coefficient of friction between the first wire and the second wire. The method also includes moving the second wire relative to the first wire, and reducing movement of at least a portion of the first wire relative to the tray surface during movement of the second wire relative to the first wire due to the wire-to-surface coefficient of friction being higher than the wire-to-wire coefficient of friction.

A partially separated fiber bundle having a surface of a reinforcing fiber coated with a sizing agent containing a water-soluble polyamide-based resin, in which a separated fiber section consisting of a plurality of separated fiber bundles and an unseparated fiber section are provided alternately along a longitudinal direction of the reinforcing fiber bundle consisting of a plurality of single yarns, wherein the reinforcing fiber bundle contains 600 fibers/mm or more and less than 1,600 fibers/mm of fibers per unit width while the reinforcing fiber has a drape level of 120 mm or more and 240 mm or less.