ISO 8543:2020 pdf download Textile floor coverings — Methods for determination of mass
8.5Preparation of specimens
Lay the specimens out flat,singly and with the use-surface uppermost in the atmosphere forconditioning and testing described in Clause 4, until they reach constant mass as defined in 3.1.
8.6Procedure
Determine the mass of each specimen, m, in grams, to a reading resolution of 0,01 g and a precisionof 0,1 g.
Then measure the length and width, in millimetres, each in four places,on the back of each specimen, tothe nearest 1 mm.
Shear the pile from the specimen.When using a band knife machine,keep on repeating the process withthe roller being set progressively lower until it is as low as possible without damaging the substrate.Ateach setting,insert the specimen into the machine several times, each time in a different direction.After each process, brush the pile upright.
When using clippers, use forward strokes in all directions.Shear as close as possible to the substrateby running the points of the comb and cutter along the substrate without digging in.Avoid plucking anytufts or damaging the substrate. lt is not necessary to shear the edges of the specimen, provided thatthe area of 25 000 mm2 in the centre is closely shorn.
Brush, blow or suction clean the specimen during and/or after shearing.Continue shearing until nofurther significant amount of pile yarn dust appears on the shearing blades or falls away when thespecimen is shaken, pile down, over a smooth surface of contrasting colour.
After shearing, unless the total area of the specimen is completely shorn without damage to thesubstrate and can be used to determine the mass per unit area of the substrate, cut a completely shornpiece of not less than 25 000 mm2 from the centre of the specimen, using the press and cutter. In eithercase, the substrate yarns in this area shall be undamaged, and no tufts shall have been plucked from it.Condition each area cut out of the shorn carpet specimens by laying them flat, singly, in the atmospherefor conditioning and testing described in Clause 4, until they reach constant mass as defined in 3.1.Determine the final conditioned mass of the shorn area of each specimen, mp, to the nearest0,01g.8.7 Expression of results
From the measurements made in 6.6, calculate for each specimen the average length and width, inmillimetres, and the area (Aj), in square millimetres.Calculate the total mass per unit area (m/A)of carpet for each specimen separately, in grams per square millimetre.Note the area (A,), in squaremillimetres, of each specimen of shorn carpet as described in 8.6 and calculate the mass per unit area(mz/Az) for each, in grams per square millimetre.
NOTE ln cases where it was possible to determine the mass of the whole of the shorn original specimen,thenA= A.In cases where the cutter was used,A equals the known area of the cutter.
For each specimen, calculate the mass of shorn pile per unit area, Q, in grams per square metre, to thenearest gram per square metre, using the formula
8.8Test report
The test report shall include the following information:
a) a statement that the test procedure was conducted in accordance with IS0 8543:2020, Clause 8;b) the identity (source and type) of the sample from which the specimens were taken, and whether itwas of varying pile height or density;
c)the standard atmosphere used for conditioning and testing;dthe number of specimens tested;
e)the mass of pile per unit area above the substrate, in g/m2, for each specimen;
f) the mean mass of pile per unit area above the substrate, in g/m2, and the overall coefficient of variation;
g)whether the sample was of varying pile height or density;h) the type of shearing apparatus used.
9 Calculation of measured surface pile density and measured pile fibrevolume ratio
9.1General
This method is applicable to textile floor coverings capable of being shorn from the backing, but isnot applicable to textile floor coverings of varying pile thickness or density unless the areas can bemeasured separately. Ilt is used in conjunction with the methods specified in Clause 8 and ISo 1766.Difficulties have been experienced when using this method for bonded-pile textile floor coverings,textile floor coverings with needled-pile and flocked-pile textile floor coverings,because of theproblems of determining a suitable end point when shearing these products.The results obtained fromsuch products should therefore be treated with caution.
9.2 Principle
Pile thickness and mass are determined before and after the pile has been shorn.The measured surfacepile density and the measured pile fibre volume ratio are calculated from the values obtained.
NOTE For the definitions of measured surface pile density and measured pile fibre volume ratio, see 3.3and 3.4.
9.3Apparatus
9.3.1 Sharp pointed knife or punching machine, balance, rule,band-knife machine or hand-heldclippers, and press and cutter, as specified in 8.3.
9.3.2 Carpet thickness tester and straightedge as described in lSO 1765.ISO 8543:2020 pdf download