Shearing


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shearing

[′shir·iŋ]
(mechanical engineering)
Separation of material by the cutting action of shears.
(mining engineering)
The vertical side cutting which, together with holing or horizontal undercutting, constitutes the attack upon a face of coal.
(textiles)
A process to remove surface irregularities in a napped fabric by passing it through a cylindrical machine with rotating spiral blades.

Shearing

 

in animal husbandry, the removal of the hairy covering from animals to obtain wool (sheep, goats, camels), to take care of skin, or to promote heat exchange (cattle and horses). Certain breeds of dog are clipped in order to achieve a desired appearance. Fine-wooled and semifine-wooled sheep are sheared only once a year, in the spring; coarse-wooled and semicoarsewooled sheep are sheared in the spring and fall. In countries with a developed sheep-raising industry, shearing is for the most part mechanized. In the USSR about 90 percent of the sheep population is sheared by machine. During the shearing period special sheds are set up and are equipped with shearing machines with 24, 36, 48, or 60 units or with sets of equipment for shearing sheep on 24 (KTO-24) or 48 (KTO-48) machines. Most common is a method of shearing derived from methods worked out by New Zealand sheep shearers. Under optimum conditions a sheep can be sheared in two to 2½ minutes.


Shearing

 

in textile production, the removal of protruding ends of threads, knots, and hairs from the surface of a fabric and the evening of the length of pile to improve the fabric’s appearance. Both woven and knitted fabrics undergo shearing. The process is carried out on two types of machines: lengthwise shearing machines (the major type) and transverse shearing machines, which are used to cut the fabric ends. The working element is a shearing mechanism consisting of a cylinder to which spiral blades are attached, a flat steel blade, a table, and guiding rollers. The rapidly rotating cylinder and the stationary flat blade form a scissors mechanism that cuts the fabric as it passes through the shearing mechanism.

Machines with outputs from 27–81 m per min are used in the USSR to shear coarse cotton, linen, light woolens, and artificial and natural silk fabrics. Machines with outputs of 8–24 m per min are used for heavy woven and knitted fabrics.

References in periodicals archive ?
It can be seen that the dilation curve shows a linearly increasing trend at the initial shearing stress stage.
The dilatancy or contraction at the shear plane during shearing can be obtained from changes in the specimen height.
Mr Owen also gained the solo blade title, shearing himself a total of 202 sheep.
In the production piercing condition, it is a challenge to ensure the material rolling direction is aligned parallel as the bevel shearing and the horizontal force against the beveling shear face could deflect the punch tip when high speed piercing AHSS.
Key word: Maize, bending stress, modulus of elasticity, shearing stress, specific shearing energy.
The objective is to synthesize the linkage for pure-rolling shear motion, so that the profiles of the upper and lower blades coincide with the moving and fixed centrodes of the output link CDG, respectively, during the shearing process.
The shearing operation was first performed to predict cut edge geometries, as shown in Figure 1(b-1).
Ash only went to New Zealand in November to improve his shearing, having taken up the job after ditching his apprenticeship to work on a farm.
Nevertheless, in all cases of soil shearing testing procedure which are mentioned above, a constant soil shearing [A.sub.0] is used.
Table 6 also lists the influence of steel fibers in the increase of the first crack by shearing.
Either way, shearing is a skill that takes practice to perfect and requires good endurance.
Shearing force describes the force required to fracture a plant when applied at 90 degrees to the plant surface and has been used to physically characterize forages (Mackinnon et al., 1988; Inoue et al., 1994).