AATCC 93 pdf free download

AATCC 93 pdf free download.Abrasion Resistance of Fabrics: Accelerotor Method.
4.1 Good laboratory practices should be followed. Wear safety glasses in all laboratory areas.
4.2 The door of the Accelerotor must be kept closed whenever the motor is runn ing. Manuflicturer ‘s safety recommendations should be followed when operating laboratory testing equipment.
4.3 A face mask is recommended for operators who work regularly with the Accelerotor to guard against inhalation of fiber dust.
5. Uses and Limitations
5.1 The results obtained by this method are affected by duration; the size, shape and angular velocity of the rotor; and by the type of liner used. These effects are interrelated, and testing conditions may be varied to produce different degrees of abrasion in a test spec imen. For example, it may require only 2 or 3 mm at 209.44 radls (2000 rpm) with the standard offset rotor to produce a reasonable degree of abrasion in a delicate or fragile fabric, while a heavier or more durable fabric may require 6 mm at 314.16 radls (3000 rpm).
5.2 When fabrics curl or, for other reasons, do not move about freely in the test chamber, testing should be discontinued.
5.3 The results of this test should not be equated with service life.
6. Apparatus and Materials
6.1 Accelcrotor (Fig. 1; see 14.2) equipped with the following parts:
6.1.1 Rotor, offset (elongated S-shape), 114 mm (4.5 in.) (Fig. 2) (see 14.3 for descriptions of alternate rotors).
6.1.2 Collar insert, plastic, lined with 3.2mm (0.125 in.) polyurethane foam (see 14.4 for description of alternate insert).
6.2 Liner, abrasive No. 250A0 (see
14.2; an alternate abrasive liner is described in 14.5).
6.3 Neon lamp or other stroboscopic device (see 14.2).
6.4 Timer, automatic, accurate to ± I s.
6.5 White glue, such as Elmers GlueAll, in squeeze bottle.
6.6 Pinking shears and marking templates, or cutting dies (see 14.11).
6.7 Brush, nylon, for cleaning Accelerotor chamber (see 14.2) or small portable vacuum cleaner for chamber and specimens.
6.8 Thread, size F, Type I, Class I or 2, Fed. Spec. V-T-295 (see 14.6).
6.9 Cotton fabric, 80 x 80 print cloth (carded yarns) 1.2 m (46 in.) wide, about 8 m!kg (4 yd/Ib), bleached and desized, free from blueing, optical bleach or finishing materials (see 14.7).
6.10 Analytical balance accurate to
±0.001g.
7. Test Specimens
7.1 In the absence of applicable specifications, take a minimum of three specimens from each sample to be tested not nearer the selvage than one-tenth the width of the fabric or 64 mm (2.5 in.). Select specimens that are representative of the whole sample to be tested.
7.2 Size of Specimens.
7.2.1 Method A (Evaluation by weight Ioss)—Cut specimens of heavier or bulkier fabrics smaller than those of lighter fabrics to minimize variations in impact produced when the specimens hit the chamber wall or abradant liner. Table I is a guide to the relationship between fabric weight, in grams per square meter (ounces per square yard), and specimen size. Specimens may be taken with the edges parallel to the warp and filling (courses and wales) or on the bias.
7.2.2 Method B (Evaluation by strength Ioss)—The specimen size is 100 x 150 mm (4 x 6 in.) with the greater dimension in the direction of the yarns to be broken. Take specimens with their edges parallel to the warp and filling yarns.AATCC 93 pdf download.