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Diagram showing S and Z twist. There are two common ways to ply a balanced yarn: regular and chain plying. Both methods involve the manipulation of "singles"—unplied strands on their own—into multiple-ply yarns by applying twist in the opposite direction than how the single was spun. For example, if in spinning the single the wheel was spinning clockwise (called a "Z" twist, as on any ...
The standard uses capital letters S and Z to indicate the direction of twist, [2] as suggested by the direction of slant of the central portions of these two letters. The handedness of the twist is the direction of the twists as they progress away from an observer. Thus Z-twist is said to be right-handed, and S-twist to be left-handed. The ...
Examples of skin depth in copper wire at different frequencies At 60 Hz the skin depth of a copper wire is about 7.6 millimetres (0.30 in). At 60,000 Hz (60 kHz) the skin depth of copper wire is about 0.25 millimetres (0.0098 in). At 6,000,000 Hz (6 MHz) [5] the skin depth of copper wire is about 25 micrometres (0.00098 in).
The handedness of the twist is the direction of the twists as they progress away from an observer. Thus Z-twist rope is said to be right-handed, and S-twist to be left-handed. Twisted ropes are built up in three steps. First, fibres are gathered and spun into yarns. A number of these yarns are then formed into strands by twisting. The strands ...
Provided the interfering source remains uniform, or nearly so, over the distance of a single twist, the induced noise will remain common-mode. The twist rate (also called pitch of the twist, usually defined in twists per metre) makes up part of the specification for a given type of cable. When nearby pairs have equal twist rates, the same ...
Although knitting may be done with ribbons, metal wire or more exotic filaments, most yarns are made by spinning fibers. In spinning, the fibers are twisted so that the yarn resists breaking under tension; the twisting may be done in either direction, resulting in a Z-twist or S-twist yarn.
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Tightness of twist is measured in TPI (twists per inch or turns per inch). [11] Two or more spun yarns may be twisted together or plied to form a thicker yarn. Generally, handspun single plies are spun with a Z-twist, and plying is done with an S-twist. [12] This is a cultural preference differing in some areas but surprisingly common.
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