ISO 7211-6:2020 pdf download

ISO 7211-6:2020 pdf download.Textiles — Methods for analysis of woven fabrics construction — Part 6: Determination of the mass of warp and weft per unit area of fabric
1 Scope
This document specifies methods for determining the mass of the warp and weft threads per unit area of fabric after the removal of any non-fibrous matter.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 139, Textiles — Standard atmospheres for conditioning and testing
ISO 1833-1, Textiles — Quantitative chemical analysis — Part 1: General principles of testing
3 Terms and definitions
No terms and definitions are listed in this document.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at http:// www .iso .org/ obp
— IEC Electropedia: available at http:// www .electropedia .org/
4 Principle
Method A: The outline of the fabric specimen to be dissected is marked in the form of a square or rectangle, and the nonfibrous matter is removed while the marked area still forms part of a larger sample and the threads cannot, therefore, be lost from it. If the amount of non-fibrous matter is to be determined, it is stipulated that the larger sample shall be a square cut with its diagonals parallel to the directions of the threads in the fabric. If the amount of non-fibrous matter has not to be determined, the larger sample may be of any shape or size. Method B: A specimen of known area is dissected and the non-fibrous matter is removed from the warp and weft threads.
5 Apparatus
5.1 Indelible marking ink.
5.2 Scissors.
5.3 Dissection needle.
5.4 Small template. Template to mark (or a die to cut) a square or a rectangle of known area of not less than 150 cm 2 . The length to width ratio of the rectangle shall not exceed 4.
5.5 Large template. Template to mark (or a die to cut) a square which is sufficiently large to enclose the area marked with the smaller template (5.4) when placed with its diagonals parallel to the sides of the enclosed square or rectangle.
5.6 Balance, accurate to 0,1 % of the smallest quantity to be weighed.
6 Conditioning and testing atmosphere
The standard atmospheres for pre-conditioning, conditioning and testing textiles specified in ISO 139 shall be used.
7 Test specimens
7.1 Conditioning
Before marking or cutting, expose the samples from which the test specimens will be removed to the standard atmosphere for conditioning until it is in equilibrium with that atmosphere.Take the specimens from each sample.