Методические указания на английском языке для студентов старших курсов технологического факультета и аспирантов. Лебедев Л.А. - 9 стр.

                                 Leaf and Color testing

       Trash and color testing take place at one test station even though separate
microprocessors control the tests and calculate the results.
       In the 900 System the leaf or trash and color of a fiber sample are measured
simultaneously, although the Trashmeter 935 and the Colorimeter 930 perform the tests
and calculate the results separately. The instruments share a test window and use the same
samples for their respective tests, but each is controlled by dedicated microprocessor.
Spinlab has designed these two instruments to be complementary in order to shorten the
test time of the entire system and to make it easy for a mill to update a Colorimeter to
include a Trashmeter or ,vice versa, to update a Trashmeter to include a Colorimeter.

                                       Trashmeter

       Trash, the nonfiber or nonlint content of cotton, may be composed of leaf particles,
stems, bark, whole or parts of seeds, motes, grass and dust. Because cotton is no cleanly
picked from the plant by hand but harvested with strippers and spindle harvesters, the
amount of foreign matter in cotton has drastically increased. Also, mills must cope with
the problem of variable and increasing trash being fed into production machinery of ever-
increasing speed and sophistication.
       This sensitive machinery demands super-clean cotton for efficient operation. Since a
mill’s opening, cleaning and carding processes cannot solve the problem of variation, a
mill must gain control over variable trash content through purchasing, mix selection and
laydown, a feat which may be accomplished with specific knowledge of each bale’s trash
content.

              An automated, video-image processor measures the visible
                        amount of trash in a cotton sample

       The Trashmeter consists of a video camera, a video monitor and a microprocessor-
based controller. Spinlab uses a high-resolution CCD camera with 93,800 pixels to scan a
ten-inch square sample window (64.5 sq cm), which detects trash particles as small as
0.0001 square inch (0.0006 sq cm). All areas darker than an adjustable threshold level are
counted as trash. Discrimination between trash and background is made on the basis of
absolute reflectivity rather than trash contrast, so variations in cotton background do not
affect the readings.