ISO 1888-2022 pdf free download – Textile glass — Staple fibres or filaments — Determination of average diameter.
The recommended type of microscope is one using plane-polarized light, and an illumination systemwith a Kohler light source and an Abbe condenser.A green filter may also be used to give better readingaccuracy.
4.2.2 Micrometer scale, with 0,01 mm divisions, for calibration of the optical system.
4.2.3 Glass slide (thickness: 1,10 mm to 1,35 mm), and cover glass (thickness: 0,16 mm to 0,19 mm).The thickness of the cover glass shall be verified periodically.
4.2.4 Mounting fluid, with a refractive index different (but not too different) from that of the glassunder examination. Benzyl alcohol, methyl salicylate, a mixture of one part glycerol and two partswater are adequate media.
4.2.5 Razor blade or scissors.
4.2.6Muffle furnace, capable of maintaining a temperature of 625 C±25°℃.
4.3Procedure
4.3.1 lt is not always necessary to remove the size from the yarns under examination.Nevertheless,yarns in which the fibres or filaments do not separate from each other in the mounting fluid shall havethe size removed by burning off to bare glass at 625 Cin a muffle furnace (4.2.6J.
4.3.2 Set up the microscope (4.2.1) with the appropriate optical system and the moving stage.Calibrate the optical system using the micrometer scale (4.2.2].
4.3.3 Prepare the specimen and the specimen holder as follows:
– Using a sharp cutting device (4.2.5), prepare a specimen of fibres or filaments not exceeding 25 mm in length.
Place the specimen on the glass slide (4.2.3).
Separate the fibres or filaments so that they are no longer in a compact bundle, but still essentiallyparallel to each other.
Using a glass rod, place one drop of mounting fluid (4.2.4) on the slide so that it wets the specimenand cover with a cover glass (4.2.3).
4.3.4 Place the slide on the microscope stage and, after adjusting the position of the specimen toobtain a clear, sharp view of the edges of the fibres or filaments, position the slide so that the micrometergraticule in the eyepiece is perpendicular to one of the fibres or filaments.
4.3.5 Move the micrometer graticule from one edge of the fibre or filament to the other edge and notethe distance moved.
When using a microprojector (see 4.2.1), simply measure the distance from edge to edge of the fibre orfilament on the transparent scale.
4.3.6 Move the slide around to obtain 25 readings on randomly selected fibres or filaments.
4.3.7 Calculate the arithmetic mean of the 25 measurements and convert this value to micrometres,using the magnification coefficient of the optical system.
5Method B: Transverse section5.1 Principle
A transverse section of a yarn that has been impregnated with resin and cured is viewed under amicroscope and the diameter of a given number of fibres or filaments in the yarn is measured.
5.2Apparatus
5.2.1 Microscope, equipped with the following:
– An eye-piece with a built-in micrometer graticule, the eye-piece and objective together giving an
overall magnification of at least x400 and preferably x1 000.The resolution of the microscope shallpermit measurement to the nearest 0,5 um or better.
– A system permitting lateral and rotational movement of the microscope stage.-An illumination system.
This system may be replaced by or used in conjunction with a microprojector on which specimens canbe measured using a transparent scale (preferably a curved scale).
The recommended type of microscope is one using plane-polarized light, and an illumination systemwith a Kohler light source and an Abbe condenser. A green filter may also be used to give better readingaccuracy.
5.2.2 Micrometer scale, with 0,01 mm divisions, for calibration of the optical system.5.2.3 Impregnation system, with fast-curing polyester or epoxide resin.
5.2.4Moulding assembly (see Figure 1 for an example).
5.2.5Saw, suitable for cutting specimens.
5.2.6Polishing device.ISO 1888 pdf download.