贝卡钢帘线结构.doc

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Steel Cord
Packing
Spools
Tyre cord is wound on metal spools
 
NOTE
The arrow on tculating the arithmetic average of the measured maximum and minimum thickness of the cord. The diameter is expressed in millimetres.
LENGTH OF LAY (1)
The axial distance required to make a 360 degree revolution of any element in a strand or in a cord and expressed in millimetres. The recommended lengths of lay are based on the ISO recommendation R-388-R20 series, ranging from mm to mm.
DIRECTION OF LAY(2)
The helical disposition of the components of a strand or cord. The strand or cord has an ‘S’ or left-hand lay if, when held vertically, the spirals around the central axis of the strand or cord conform in direction of slope to the central portion of the letter ‘S’; and ‘Z’ or right-hand lay if the spirals conform in direction of slope to the central portion of the letter ‘Z’.
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LINEAR DENSITY
The mass per unit length expressed in grams per metre.
ARC HEIGHT(1)
The amount of bending of a cord sample lying on a flat surface against two supports with an interdistance of 300 mm.
RESIDUAL TORSIONS
The number of revolutions made by a specific length of cord when one end is held in a fixed position and the other allowed to turn freely,
expressed in turns per 6 metres.
FLARE(2)
The spreading of the filament ends or the strand ends at the cut end of a cord, expressed as the unravelled length in millimetres.
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Mechanical properties
BREAKING FORCE
The maximum force or load expressed in Newtons, which a test specimen can support during a tensile test of loading to break.
TENSILE STRENGTH
The breaking load of a filament per unit of unstrained cross-sectional area expressed in Newtons per square millimetre or Megapascals.
ELONGATION AT BREAK (or breaking elongation)
The increase in length of a test specimen, which results from subjecting it to the breaking