A spool of optical fibre comprises a spool axis and a length of optical fibre wound around the spool axis to form a plurality of wrap segments arranged axially along the spool axis, wherein adjacent wrap segments partially overlap in the axial direction. Each wrap segment comprises a first wrap layer wound in a first axial direction over a first axial distance, and a second wrap layer wound over the first wrap layer in a reverse second axial direction over a second axial distance greater than the first axial distance, the optical fibre extending from the second wrap layer of one wrap segment to the first wrap layer of an adjacent wrap segment. The spool may be mounted in a device such that the optical fibre can be despooled and deployed from the device.

A horizontally wound continuous coil of metallurgically heat treated metal tubing is alternatively formed in a multi-layered configuration using a sequential four-layer or two-layer pattern of winding layer groups. The method of sequential four-layer or two-layer patterning of winding groups support formation of jumbo horizontally wound coils of continuous annealed copper tubing for use by end users of annealed copper tubing.

A horizontally wound continuous coil of metallurgically heat treated metal tubing is alternatively formed in a multi-layered configuration using a sequential four-layer or two-layer pattern of winding layer groups. The method of sequential four-layer or two-layer patterning of winding groups support formation of jumbo horizontally wound coils of continuous annealed copper tubing for use by end users of annealed copper tubing.

A welding wire coil package system for a coil of wire including a sheath that is laid over the coil where the sheath includes at least one layer of material that adheres to the wire to hold the wire within the coil in the position that the coil is formed and prevent unintended movement of the wire, the sheath defining an opening through which wire is paid out from an interior surface of the coil.

A spool endform assembly includes an endform with a central collar that are configured to rotate about a rotational axis. The spool endform assembly further includes a mount sub-assembly configured to be mounted in a fixed orientation on a mounting structure (such as movable arm). The spool endform assembly is further configured to permit misalignment of the fixed orientation of the mount sub-assembly relative to the rotational axis of the endform and central collar. In embodiments, controlled movement of the mounting structure can be used to connect the spool endform assembly to a rotatable mandrel of a wire winding spool and disconnect the spool endform assembly from the rotatable mandrel. By permitting misalignment of the fixed orientation of the mount sub-assembly relative to the rotational axis of the endform and central collar, the spool endform assembly makes it easier to connect the spool endform assembly to the rotatable mandrel and to disconnect the spool endform assembly from the rotatable mandrel. Other features and aspects are described and/or claimed.

To provide a wound yarn package and a method for manufacturing the same in which even if sea-island type fibers are wound around a bobbin one by one by a traverse mode, cob-webbing and curling are less likely to occur, and the variation in the heat shrinkage rate between layers constituting the yarn layer is reduced. When winding sea-island type fibers with a fineness of 100 to 6400 dtex around a bobbin one by one by a traverse mode to form a yarn layer, each yarn constituting the n-th yarn layer is wound at a position 0 to x mm away from each yarn constituting the (n?1)-th yarn layer, with the yarn width of the sea-island type fiber being taken as x (mm), to fabricate a wound yarn package

A method of winding an optical fiber includes winding the optical fiber using a bobbin that includes: a body portion having two end portions; and a pair of flanges, respectively disposed at the end portions in an axial direction of the body portion. An inner surface of each of the flanges is inclined toward an outer side in the axial direction and toward a radial outer side. The method further includes guiding the optical fiber to the bobbin using a final pulley. The bobbin and the final pulley reciprocate relative to each other in the axial direction at a traverse speed V (mm/sec) such that 0.0050 (rad)0.1000, where is a delay angle, =arctan (V/L), and L (mm) is a distance from a winding position of the optical fiber at the bobbin to the final pulley in a radial direction.

A method of winding an optical fiber includes winding the optical fiber using a bobbin that includes: a body portion having two end portions; and a pair of flanges, respectively disposed at the end portions in an axial direction of the body portion. An inner surface of each of the flanges is inclined toward an outer side in the axial direction and toward a radial outer side. The method further includes guiding the optical fiber to the bobbin using a final pulley. The bobbin and the final pulley reciprocate relative to each other in the axial direction at a traverse speed V (mm/sec) such that 0.0050 (rad)0.1000, where is a delay angle, =arctan (V/L), and L (mm) is a distance from a winding position of the optical fiber at the bobbin to the final pulley in a radial direction.

A method of forming a fracking tool, such as a frac ball or a frac plug mandrel, may include: applying a resin to wet a filament; winding the wetted filament to form a cylinder; placing the cylinder in a cylindrical mold; increasing a pressure in the cylindrical mold to at least 3,000 psi; curing the resin at the pressure and a temperature of at least 250 F.; and extracting the cylinder from the mold. In some instances, the method may further include adding the resin and/or another resin into the cylindrical mold.

A method of forming a fracking tool, such as a frac ball or a frac plug mandrel, may include: applying a resin to wet a filament; winding the wetted filament to form a cylinder; placing the cylinder in a cylindrical mold; increasing a pressure in the cylindrical mold to at least 3,000 psi; curing the resin at the pressure and a temperature of at least 250 F.; and extracting the cylinder from the mold. In some instances, the method may further include adding the resin and/or another resin into the cylindrical mold.