Patent ID: 9575049
Date: 2017-02-21
CPC Classifications: G01N

Claim:
1. A method for accurately testing yarn hairiness through stretching one-directionally, comprising steps of: unwinding off a yarn from a bobbin yarn package which is provided on a supporter; passing the yarn successively through a tension yarn guiding device, a brushing wheel, a first yarn guiding wheel and a second yarn guiding wheel which are provided on a pre-operation platform of a hairiness tester; entering a hairiness testing area by the yarn, wherein the hairiness testing area comprises a testing head, a laser, a third yarn guiding wheel and a fourth yarn guiding wheel, wherein: the laser is provided between the third yarn guiding wheel and the fourth yarn guiding wheel; and a projection receiver of the testing head corresponds to the laser; passing the yarn which enters the hairiness testing area through the third yarn guiding wheel, and then passing the yarn, at a tension state, through a central position between the laser and the projection receiver; moving the yarn out of the hairiness testing area via the fourth yarn guiding wheel; after moving out of the hairiness testing area, passing the yarn successively through a fifth yarn guiding wheel and a fixed yarn guiding groove; pulling the yarn by a driving roller and a driven roller; and finally, falling into a waste yarn collecting container; wherein: a suction pipe is provided on an external side of the laser; the suction pipe is provided between the laser and the projection receiver of the testing head; an end plane of an air inlet of the suction pipe is rectangle; the rectangle end plane of the air inlet has a width of 3-30 mm; a length of the rectangle end plane of the air inlet is larger than or equal to a diameter of the laser; a center of the end plane of the air inlet of the suction pipe and a center of the laser are located at the same horizontal plane; the end plane of the air inlet of the suction pipe is vertical to a plane of the laser and tangent to an edge line of an emitting surface of the laser; the end plane of the air inlet of the suction pipe is parallel with the yarn running between the laser and the projection receiver; the suction pipe is fixed on the pre-operation platform of the hairiness tester through a sleeve connector; the sleeve connector is connected with an exhausting fan through a hose; the air inlet of the suction pipe generates a negative pressure under an effect of the exhausting fan, so as to laterally suck the yarn running at the tension state among the laser, the projection receiver and the suction pipe; all the hairiness on a yarn surface in the hairiness testing area stretches straight one-directionally towards an airflow direction, at a height of a center of the air inlet of the suction pipe; and, the one-directional straight stretched hairiness on the yarn surface is accurately projected to the projection receiver of the testing head at an equal length, so as to accurately test a hair amount and a hair length.