EN 984-2001 pdf download.Textile floor coverings – Determination of the mass per unit area of the use surface of needled floor coverings.
This EN 984 specifies a method for the determination of the mass per unit area of the use surface of needled floor coverings in which the use surface can be distinguished visually from the substrate.
2 Normative references
This European Standard incorporates by dated or undated references, provisions from other publications. These normative references are cited at the appropriate places in the text, and the publications are listed hereafter. For dated references, subsequent amendments to or revisions of any of these publications apply to this European Standard only when incorporated in it by amendment or revision. For undated references the latest edition of the publication referred to applies (including amendments).
EN 20139 Textiles — Standard atmospheres for conditioning and testing.
ISO 1957 Machine-made textile floor covering — Sampling and cutting specimens for physical tests.
3 Principle
The mass of a defined area of flat needled floor covering is determined before and after shearing oft the use surface with a band knife.
4 Apparatus
4.1 Rule, graduated in millimetres.
4.2 Device to cut out test specimens of minimum dimensions (200 x 200) mm.
NOTE Suitable devces are a die cutter and press. hand or electric knife or scissors.
4.3 Band knife machine enabling the use surface to be shorn off level with the substrate.
4.4 Balance, accurate to ± 0.01 9.
5 Sampling and preparation of test specimens
For each sample, cut at least eight square specimens of minimum dimensions (200 x 200) mm so that their sides are respectively parallel to and perpendicular to the direction of manufacture of the needled floor covering following the procedure in ISO 1957.
7 Procedure
Shear one test specimen progressively until the substrate is visible and use It as a guide for shearing the other specimens.
Weigh the remaining specimens to determine the mass, m1, to the nearest 001 g.
Measure the dimensions of each test specimen in four places for each side to determine them to the nearest millimetre.
Use the band knife to shear the use surface from each of the remaining seven test specimens. Shear progressively until the surface of the shorn test specimen shows approximately 50 % of the substrate (coating layer or resin) using the original test specimen produced as a guide.
Select the five test specimens that appear to meet the 50 % substrate/SO % use surface fibre criteria and recondition them in the standard atmosphere to constant mass1).
When the use surface layer of a pile needled floor covering Consists originally of several layers of different colours that during manufacture are needled so as to form a visually uniform layer, this layer shall be treated as a single layer for the determination of the mass of the use-surface. The end point for shearing shall be a clearfy visible different layer forming either the primary or the secondary backing. The primary backing may be a non-woven or a woven scrim and the secondary backing may be bitumen back, foam back etc.
Weigh the five shorn test specimens to determine their mass, ,n, to the nearest 0,01 g.
If the coefficient of variation between the five specimens that most closely represent the specimen produced as a guide is more than 7 %. all seven specimens shall be used to calculate the mass of the use-surface.
8 Calculation and expression of results
Calculate the area, S, of each test specimen and express in mm2.
Calculate the mass of the use layer for each test specimen using the following expression:
mass of use layer m1 — Calculate the mass per unit area of the use layer for each test specimen using the following expression:
Use-surface mass/unit area.EN 984-2001 pdf download.