ISO 17504 pdf download.Textile floor coverings — Determination of wool fibre integrity using an abrasion machine
1 Scope
This International Standard specifies a method for the determination of fibre damage in the pile of textile floor coverings having a pile material of at least 80 % wool.
2 Normative references
The following normative documents contain provisions which, through reference in this text, constitute provisions of this International Standard. For dated references, subsequent amendments to, or revisions of, any of these publications do not apply. However, parties to agreements based on this International Standard are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest edition of the normative document referred to applies. Members of ISO and IEC maintain registers of currently valid International Standards. ISO 139, Textiles — Standard atmospheres for conditioning and testing. ISO 1957, Machine-made textile floor coverings — Sampling and cutting specimens for physical tests.
3 Principle
Circular test specimens are abraded against a specified fabric for a set number of revolutions and the mass loss determined. The abradant is mounted in a large head and the test specimen to be abraded is mounted in a smaller head. The heads are offset from each other and rotated at the same speed. This method gives a constant relative velocity over the surface of the test specimen and thus relatively even wear.
4 Apparatus
4.1 Carpet abrasion machine 1 ) , consisting of a circular specimen holder rotating at approximately the same speed and in the same direction as the circular abradant but with the axes of rotation offset and having the following characteristics.- Rotational speed of specimen holder and abradant holder: 2,6 s 21 6 0,05 s 21 (1 56 rpm 6 3 rpm); – Size of aperture of specimen holder: 800 mm 2 6 1 0 mm 2 ; – Size of aperture of abradant holder: 1 0 560 mm 2 6 20 mm 2 ; – Distance between axes of specimen holder and abradant: 25,4 mm 6 0,2 mm;4.3 Standard felt backing, of wool felt of mass 750 gm 2 6 50 gm 2 and with a thickness of 2,5 mm 6 0,3 mm. 3)
4.4 Weighing balance, capable of measuring loads in the region of 350 g with an accuracy of 6 1 0 mg.
4.5 Soft bristle brush, for removal of loosened fibre prior to weighings.
5 Sampling and preparation of test specimens
Using, e.g., a cutting die and press, cut with pile side uppermost, four circular test specimens of approximately 37,5 mm diameter from the material to be tested, in accordance with the procedure described in ISO 1 957.
6 Conditioning
Condition the test specimens lying flat, pile side uppermost, in the standard atmosphere for testing textiles as defined in ISO 1 39, for a minimum of 24 h.
7 Test procedure
7.1 Mount a test specimen in the specimen holder taking care to ensure that the test specimen is flat. If necessary, trim the outer tufts to facilitate entry into the holder. Using a tensioning device (usually a torque wrench) clamp the test specimen in the holder with a tension of aproximately 6,5 N . m and brush any loose fibres/tufts from the pile surface. 7.2 Weigh the specimen holder complete with mounted test specimen and record the initial mass (m i ) to 1 0 mg accuracy. 7.3 Fit the specimen holder in position on the machine. 7.4 Insert a new disc of the standard abradant with the felt backing in the abradant holder and fit the holder into position on the machine. A new piece of felt shall be used for each carpet. It shall be used for no more than 20 000 cycles in total and it shall be reversed after 1 0 000 cycles.If heavily contaminated by fibres, observed by a change in colour, or by dust visible on the surface and unable to be removed, the felt shall be replaced. 7.5 Set the counter for 5 000 cycles, lower the abradant holder on to the test specimen and start the machine. 7.6 Remove the specimen holder from the machine, brush off any loosened fibres and weigh (complete with test specimen) within 2 min of the end of the abrasion treatment. Record the final mass (m f ) to 1 0 mg accuracy. 7.7 If the test specimen shows wear to backing at 5 000 cycles the test shall be repeated using a shorter duration. The test duration shall be selected to be as long as possible without causing wear to backing (e.g. 3 500 cycles or 2 500 cycles).