SIST EN 1049-2:1999

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Tekstilije - Tkanine - Konstrukcija - Analizne metode - 2. del: Ugotavljanje števila niti na dolžinsko enoto (ISO 7211-2:1984, spremenjen)Textilien - Gewebe - Untersuchungsverfahren - Teil 2: Bestimmung der Anzahl der Fäden je Längeneinheit (ISO 7211-2:1984 geändert)Textiles - Tissus - Construction - Méthodes d'analyse - Partie 2: Détermination du nombre de fils par unité de longueur (ISO 7211-2:1984 modifiée)Textiles - Woven fabrics - Construction - Methods of analysis - Part 2: Determination of number of threads per unit length (ISO 7211-2:1984 modified)59.080.30TkanineTextile fabricsICS:Ta slovenski standard je istoveten z:EN 1049-2:1993SIST EN 1049-2:1999en01-marec-1999SIST EN 1049-2:1999SLOVENSKI
STANDARD
International Standard 721112 INTERNATIONAL ORGANIZATION FOR STANDARDIZATlONWvlEIKAYHAPO~HAR OPrAHM3AL&lR I-IO CTAHAAPTM3AWlM~RGANISATION INTERNATIONALE DE NORMALISATION Textiles - Woven fabrics - Construction - Methods of analysis - Part 2: Determination of number of threads per unit length Textiles - Tissus - Construction - M&hodes d’analyse - Partie 2: D&termination du nombre de fils par unit& de longueur First edition - 1984-03-15 UDC 677.064 : 677.017.353 Ref. No. IS0 7211/2-1984 (E) Descriptors : textiles, woven fabrics, tests, determination, numbers, yarns. Price based on 6 pages SIST EN 1049-2:1999

Fo reword IS0 (the International Organization for Standardization) is a worldwide federation of national standards bodies (IS0 member bodies). The work of developing International Standards is carried out through IS0 technical committees. Every member body interested in a subject for which a technical committee has been authorized has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. Draft International Standards adopted by the technical committees are circulated to the member bodies for approval before their acceptance as International Standards by the IS0 Council. International Standard IS0 7211 I2 was developed bY Technical Committee ISO/TC 38, Textiles, and was circulated to the member bod ies in November 1982. It has been approved by the member bodies of the following countries: The member body tech nical gro unds Australia Belgium Brazil Bulgaria Canada China Czechoslovakia Egypt, Arab Rep. of Finland Germany, F. R. Ghana Hungary of the folio wing country expressed disapproval of the document on India Iran Iraq Israel Italy Jamaica Japan Korea, Rep. of Mexico Netherlands New Zealand Poland Portugal Romania South Africa, Rep. of Spain Sweden Tanzania Turkey United Kingdom USSR Venezuela France 0 International Organization for Standardization, 1984 Printed in Switzerland SIST EN 1049-2:1999

INTERNATIONAL STANDARD ISO7211/2-1984(E) Textiles - Woven fabrics - Construction - Methods of analysis - Part 2: Determination of number of threads per unit length 1 Scope and field of application This part of IS0 7211 specifies three methods for the deter- mination of the number of threads per centimetre in woven fabrics. Any of the three methods may be used, the choice depending on the character of the fabric. However, in case of dispute method A is recommended. Method A: Dissection of fabric, suitable for all fabrics. This is the most laborious method but has fewer limitations than the others; in particular, it is the only one that is really suitable for the examination of certain folded structures and other complicated weaves. Method B: Counting glass, suitable for woven fabrics with more than 50 threads per centimetre. Method C: Traversing thread counter, suitable for all fabrics. Where the number of threads per centimetre is low, it may be convenient to express the results as the number of threads per decimetre. NOTE - Methods using parallel line gratings and tapered line gratings have been given in the annex for information. These methods have not been considered accurate enough to be used as standard test methods but can be used to give rough and ready estimates for routine testing. 2 Reference IS0 139, Text/i/es - Standard atmospheres for conditioning and testing. 3 Principle Three methods of determining the number of threads per centimetre are specified, any of which may be used, the choice depending on the character of the fabric. The prin- ciples are as follows: Method A: A section of fabric of dimensions in accor- dance with those given in clause 4 is dissected and the number of threads counted. The threads that are counted are preferably short, 1 or 2 cm being suitabl Method B: The number of threads visible with aperture of a specified counting glass is determined. to be e. n the Method C: The number of threads per centimetre of the fabric is determined with the aid of a traversing thread counter. 4 Minimum measuring distance Use the appropriate minimum measuring distance specified in the table. Table - Minimum measuring distance Number of threads per centimetre Less than 10 10 to 25 25 to 40 ~ More than 40 Minimum measuring distance cm 10 5 3 2 Number of threads per test piece Less than 100 50 to 125 75 to 120 More than 80 Accuracy in percentage (count to within 0,5 thread) Greater than 0,5 I,0 to 0,4 0,7 to 0,4 Less than 0,6 For the method A, take test pieces containing at least 100 threads. For narrow fabrics having a width of 10 cm or less, count all warp threads including the selvedge ends and express the result as threads per full width. When fabrics are patterned by broad areas of higher or lower density of thread spacing, select test specimens containing at least one weave repeat (see clause 10). 5 Conditioning and testing atmosphere One of the standard atmospheres for conditioning and testing textiles as defined in IS0 139 shall be used for conditioning and testing. ’ 6 Test specimens No specially prepared specimens are required except for method A (see 7.21, but count the threads at not less than five different points selected to represent the fabric as fully as poss- ible. Expose the fabric or specimens to the standard at- mosphere for testing for at least 16 h before making the test. SIST EN 1049-2:1999

IS0 7211/2-1984 (E) 7 Method A - Dissection of fabric whole repeats in the measuring distance, plus the remaining in- dividual threads. Determine the number of threads in a repeat 7.1 Apparatus 7.1.1 Clamp, holding two short pins parallel and with their points being within + 0,02 cm of the minimum measuring distance specified in clause 4. Alternatively, when a clamp is not available, by analysis of the weave or dissection of the fabric. Count the number of warp threads, or the number of weave repeats, or the number of warp thread units and fractions of a unit bounded by the appropriate pair of opposite sides of the aperture. Repeat with one of the edges of the aperture parallel to the weft threads, and count the number of weft threads or weave repeats or number of weft thread units in a similar manner. 7.1.2 Two dissecting needles and 7.1.3 Heavy steel rule. If the face of the fabric is composed mainly of one set of threads, as with certain twills, sateens, etc, it may be found easier to count on the back of the fabric, where the weave design is more readily recognizable. 7.2 Procedure 9 Method C - Traversing thread counter Take five specimens at random (see clause 6) 0,4 to 0,6 cm longer than the minimum measuring distance specified in clause 4 and sufficiently wide to facilitate handling. Take care not to disturb the distribution of threads, especially in a loosely woven fabric. Pass the pins in the clamp (7.1 .I) through a specimen 0,2 to 0,3 cm from each end. Remove the shorter threads (those in the direction to be counted) from the specimen outside the two pins, so that the measuring distance of fabric between the pins remain. Then remove the short threads from the specimen and count them. Count any threads impaled on a pin as half a thread. It is usually convenient to employ a pair of pointed forceps to remove the threads. The threads may be arranged in groups of ten for convenience in counting. 9.1 Apparatus 9.1.1 Traversing thread counter, incorporating a low- power microscope, of X 4 to X 20, mounted so that it can be traversed by means of a screw over a graduated base suffi- ciently long to meet the minimum measuring distance re- quirements of clause 4. Types with an index line in the eyepiece or a pointer traversing with and visible through the microscope are equally suitable. 9.2 Test procedure Use a measuring distance in accordance with clause 4. An approved alternative method where a clamp is not available is to insert two dissecting needles (7.1.2) the required distance apart by sliding their points down the appropriate graduation marks of a heavy steel rule (7.1.3) placed on edge. 8 Method B - Counting glass Lay the fabric flat on a horizontal surface and place the thread counter (9.1 .I) upon it in s
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