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What is "Crimp" - Definition & Explanation

Property of fibers exhibiting a wavy, undulating structure. Wool has a natural 3D crimp.
To squeeze a metal connector closed to form a fastener, such as hog rings or wire ties.
a) In Fibre

The waviness of a fibre, i.e. the condition in which the axis of a fibre under minimum external stress departs from a straight line and follows a simple or a complex or an irregular wavy path.

NOTE:

1. In its simplest form, crimp is uniplanar and regular, i.e. it resembles a sine wave, but it is frequently much more complicated and irregular. An example of three-dimensional crimp is helical.

2. Crimp may be expressed numerically as the number of waves (crimps) per unit length, or as the difference between the distance between two points on the fibre when it is relaxed and when it is straightened under suitable tension, expressed as a percentage of the relaxed distance.

b) In Yarn

The waviness or distortion of a yarn owing to interlacing in the fabric.

NOTE:

1. In woven fabric, the crimp is measured by the relation between the length of the fabric test specimen and the corresponding length of yarn when it is removed therefrom and straightened under suitable tension. The crimp may then be expressed numerically as a percentage or as a ratio, i.e. the ratio of yarn length to fabric length. In both methods, fabric length is the basis.

2. Although this definition could logically be applied to knitted fabrics or fabrics of pile construction, it is usual to employ special terms, e.g. stitch length, terry ratio.

The degree of corrugation or regular wave found in locks of fibre. This can vary from an extremely tight crimp with many closely spaced corrugations to a lock that is completely straight with no wave or crimp whatsoever. The presence of crimp may give more elasticity to the fibre once it is processed into yarn and result in better performance of the yarn.
The regular undulation along the length of an individual fiber or lock of fiber. A higher number of crimps per inch can indicate a finer fiber.
To bend, kink, curl, or wave a fiber to give it more loft.
In fiber, a nonlinear configuration, such as a sawtooth, zigzag or random curl relative to the fiber axis. Most synthetic fibers, both staple and filament, used in carpets are crimped. Fiber crimp increases bulk and cover and facilitates interlocking of staple fibers in spun yarns.
The natural waviness of the wool fiber; it varies with the diameter of the fiber.

Some other terms

Some more terms:

A yarn which differs from the normal construction of single and folded yarns by way of deliberately produced irregularities in its construction. These irregularities are formed by increasing the...
The term comes from the Spanish word toca. A toque is a type of hat with a narrow brim or no brim at all. They were popular during the 13th-16th century in Europe, especially in France. One toque...
A woven fabric with a series of faint stripes formed by the arrangement of light, medium, and dark warp yarns or by twisting together 2 yarns of different colors. Used for drapery, upholstery,...
A method of resist dyeing which employs wax as the resist. The pattern is covered with wax, and the fabric is then dyed: the wax patterns will not take the dye. The wax is removed after dyeing by...
a) A multi-filament yarn with no twist. NOTE: The term is still used in respect of these yarns after a small amount of twist has been introduced by subsequent processing, e.g. as in over-end...

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