TWIST PITCH Sample Clauses

TWIST PITCH. The strand shall be twisted so that the filaments follow the same rotation as a right-handed screw thread. If the strand twisting equipment is used for different kinds of production, the presence, value and direction of the filament twisting shall be verified by the Supplier on every strand piece length. If the Supplier relies on a dedicated machine, whose settings are fixed once and for all, the verification shall be carried out at the start of production and on a statistical basis agreed upon between the Supplier and F4E.
Sample 1
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TWIST PITCH. The strand twist pitch and the twist direction are measured on straight sections of stand, stretched on a fixture holding the ends. The Copper stabilizer of a short (~20 mm long) section of the strand is etched by few drops of a HNO3 solution until the bundle of filaments becomes visible. Under optical microscope, the half twist pitch can be estimated looking at the etched section. Alternatively, the twist pitch can be measured on polished longitudinal sections of strand: a short (~30 mm long) section of strand is flat embedded into resin and it is carefully polished to the middle, i.e. the axis, of the strand (this can be verified checking at the microscope the strand diameter). The half pitch can be estimated at the optical microscope looking at the outer layer of filaments emerging from the matrix in the longitudinal section.
Sample 1

Related to TWIST PITCH

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