ISO 20754:2018 pdf free
ISO 20754:2018 pdf free.Textiles – Man-made fibres – Determination of shape factors in cross section
This method provides techniques for the assessment of the cross-sectional shape of man-made fibres,based on contour lines, measured radii and perimeters, calculated area and other geometric quantities.Furthermore, the method provides techniques for the calculation of specified shape factors in the cross-sectional shape.
Measuring microscope apparatus, which meets the following requirements:
a) stage mechanism moveable in two perpendicular directions;
b) magnification not less than 400x;
c) minimum resolvable distance of 1,5 um;
d) digital measuring stage to measure the distance, area, perimeter, angles and other parameters.
Arrange the fibres in parallel and place them into the notch on the microtome (5.2). Multiple fibres can be separated by other coloured fibres.
Cut away the fibre ends that stick out and turn the push rod adjustment screw to an appropriate level,so as to expose fibres at a height of 20 μm to 30 μm. Coat them with collodion or another coating used for microscopy cross-sections, and wait until solid.
Cut a slice of fibre using a sharp blade. Place it on the glass slide, into a drop of anhydrous glycerol or liquid paraffin, and place the cover glass on top.
Arrange the fibres in parallel as a bundle.Apply a manual twist at one end of the bundle to bring it to a point and feed this point through the hole in the sample plate. Gradually pull the fibre bundle through the hole, until it is centred and under sufficient tension to resist further movement but not so tightly filled as to create compression on the fibres.
Using a sharp blade, cut away the fibre ends that stick out on both sides of the plate so that both sides are smooth and no individual hairs protrude.
Place the microscope stage micrometer (5.5) on the stage. Measure the distance observed between two scale lines at the far edges, under the objective lens.
Select different magnifications and adjust the distance between the lens and the sample, in order to capture clear images of the magnified fibre cross-section.ISO 20754 pdf free download.
