BS 4805:1989 pdf free download.Method for Determination of the dimensions of rectangular textile floor coverings.
1 Scope
BS 4805 describes a method for the determination of dimensions of rectangular textile floor coverings having a length to width ratio of less than five. It applies to both hand-made and machine-made textile floor coverings. The method is not applicable to materials to be laid edge to edge as tiles.
This method is intended for use when precise determinations of the dimensions of textile floor coverings are essential and when before measurement it is possible to allow relaxation of any strains remaining after manufacture.
NOTE The title of the publication referred to in BS 4805 is given on the inside back cover.
2 Definitions
For the purposes of BS 4805 the following definitions apply.
2.1
total length of textile floor covering
dimension in the warp direction (or direction of manufacture) between the outermost edges of the textile floor covering including any backing or binding that may be present but excluding fringes
2.2
total width of textile floor covering dimension in the weft direction (or direction at right angles to the direction of manufacture) between the outermost edges of the textile floor covering including any backing or binding that may be present but excluding fringes
2.3
length of pile section
the distance between the exterior edges of the pile, measured at the base, taken in the warp direction (or direction of manufacture) of pile carpets
2.4
width of pile section
the distance between the exterior edges of the pile, measured at the base, taken in the weft direction (or direction at right angles to the direction of manufacture) of pile carpets
3 Principle
The total length and width, excluding fringes, of the relaxed textile floor covering are measured in at least three places and the average dimensions for each direction calculated. In addition, for pile carpets, the distance between the outer edge of the base of the pile and the nearest outermost edge of the carpet is determined, and the length of fringe, if present.
4 Apparatus
4.1 A measuring instrument, capable of measuring the length of the textile floor covering, accurate to 0.5 cm.
5 Procedure
5.1 Pretreatment
Spread the textile floor covering on a smooth flat, horizontal surface so that no crinkles are present and allow it to relax for not less than 48 h.
5.2 Measurements
5.2.1 Make each measurement of length or width (A1, and A) between the outermost edges of the textile floor covering including any backing or binding that may be present but excluding fringes (see Figure 1).
5.2.2 For pile carpets also measure in the length and width directions the distances BLI and B19, and B1 and B2 between the outer edge of the base of the pile and the nearest outermost edge of the carpet as described in 5.2.1 (see Figure 1).
5.2.3 If fringes are present, measure these in the length and width directions (C11 and C, and C1 and C from the outermost edge of the textile floor covering to the nearest edge of the extended fringe (see Figure 1).
5.2.4 Make all measurements to the nearest 0.5 cm. If measurement B is less than 0.5 cm record the result as zero.
5.3 Number of measurements
Make at least three sets of measurements in both the length and width directions in such a way that one set of measurements is made at approximately 10 cm from each end of the textile floor covering and one set in approximately the middle. i.e. three readings for A and six readings in corresponding positions for B and C in each direction.
6 Calculation and expression of results
6.1 Calculate the average total length, AL, and average total width, A, to the nearest 0.5 cm for distances up to 100 cm and to the nearest 1 cm for greater distances.
6.2 For pile carpets, calculate the length and width of the pile section at each position as
A1, — (B11 + B) and — (Bv,j + B,,,) respectively Calculate the average length and width of the pile area.
6.3 Calculate the average length of fringe, if present, in the length and width directions.
7 Test report
The test report shall include the following information:
a) a reference to this method of test,
i.e. BS 4805:1989;
b) individual readings and average values of:
1) total length and width;
2) length and width of the pile section:
3) length of fringe, if present, in the length and
width directions of the textile floor covering.