1、Textiles - Determination of the resistance of cellulose- containing textiles to micro-organisms - Soil burial test - Part 1: Assessment of rot-retardant finishing The European Standard EN IS0 11721-1:2000 has the status of a British Standard ICs 07.100.99; 69.N0.30 BS EN IS0 11721-1:2001 NO COPYING
2、WlTHOuT BSI PERMISSION EXCEPT AS PERMiiTED BY COPYBIGET LAW STD.BSI BS EN IS0 11721-1-ENGL 2001 m 1b24bb9 0897152 047 = BS EN IS0 11721-1:2001 been prepared under the Committee for Materials and Chemicals, was published under the authority of the Standards Committee and comes into effect on 15 March
3、 2001 direction of the Sector AmdNo. Date Q BSI 03-2001 ISBN O 580 36695 2 National foreword Comments This British Standard is the official English language version of EN Is0 11721-1:2001. It is identical with IS0 11721-1:2001. The UK participation in its preparation was entrusted to Technical Commi
4、ttee TO, Chemical tesing of texliles, which has the responsibility to: - aid enquirers to understand the text; - present to the responsible internationaVEuropean committee any enquiries on the interpretaton, or proposals for change, and keep the UK interests informed; - monitor related intedonal and
5、 European developments and promulgate them in the UK. A list of organizations represented on this committee can be obtained on request to its secretary. Cross-references Attention is drawn to the fact that CEN and CENELEC Standards normally include an annex which lists normative references to intern
6、ationd publications with their corresponding European publications. The British Standa,rds which implement these internatiod or European publications may be found in the BSI Standards Catalogue under the section entitled “International Standards Correspondence Index“, or by using the “Find“ facility
7、 of the BSI Standards Electronic Catalogue. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligation
8、s. Summary of pages This document comprises a front cover, an inside front cover, the EN IS0 title page, pages 2 to 13 and a back cover. The BSI copyright notice displayed in this document indicates when the document was last issued. sTD.BSI BS EN IS0 11721-1-ENGL 2001 m Lb24bb9 0897153 Ta3 m EUROPE
9、AN STANDARD NORME EUROPENNE EUROPISCHE NORM EN IS0 11721 -1 January 2001 ICs 07.100.99; 59.080.30 English version Textiles - Determination of the resistance of cellulose-containing textiles to micro-organisms - Soil burial test - Part 1 : Assessment of rot-retardant finishing (IS0 1 1721 -1 :2001) T
10、extiles - Dtermination de la rsistance aux micro- organismes des textiles contenant de la cellulose - Essai denfouissement - Partie 1 : Evaluation dun traitement dimputrescibilit (IS0 11 721 -1 :2001) Textilien - Bestimmung der Widerstandsfhigkeit zellulosehaltiger Textilien gegen Mikroorganismen -
11、Erdeingrabetest - Teil 1 : Nachweis einer verrotungshemmenden Ausrstung (IS0 11721-1:2001) This European Standard was approved by CEN on 4 October 2000. CEN members are bound to comply with the CENEENELEC Internal Regulations which stipulate the conditions for giving this European Standard the statu
12、s of a national standard without any alteration. Up-todate lists and bibliographical references concerning such national standards may be obtained on application to the Management Centre or to any CEN member. This European Standard exists in three official versions (English, French, German). A versi
13、on in any other language made by translation under the responsibility of a CEN member into its own language and notified to the Management Centre has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France,
14、 Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMlTEE FOR STANDARDIZATION COMITE EUROPEEN DE NORMALISATION EUROPISCHES KOMITEE FOR NORMUNG Management Centre: rue de Stassart, 36 81050 Brussels Q 2001 CEN
15、 All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN IS0 11721-1:2001 E Page 2 EN IS0 11721-1:2001 Contents Foreword 3 Introduction . 4 1 Scope . 5 2 Normative references . 5 3 Safety precautions . 5 4 Principle 5 5 Apparatus and reagents
16、6 6 Test specimens 7 6.1 Preparation . 7 6.2 Number of specimens 7 7 Leaching procedure . 7 8 Assessment of the level of microbial activity of the soil . 8 9 Procedure 8 10 Calculation and expression of results . 9 11 Test report . 10 Annex A (normative) Determination of water holding capacity and w
17、ater content of the test soil 11 A.l A.2 A.3 Annex ZA (normative) Normative references to international publications with their Determination of the water content (WC) 11 Correction of water content from a lower to a higher value 11 Determination of water holding capacity (WHC) . 12 relevant Europea
18、n publications 13 STD-BSI BS EN IS0 LL72l-L-ENGL 2002 W 162Qbb9 0897155 85b W Page 3 EN IS0 11721-1 2001 Foreword The text of EN IS0 11721-1:2001 has been prepared by Technical Committee CEMC 248 “Textiles and textile products“, the secretariat of which is held by BSI, in collaboration with Technica
19、l Committee ISOiTC 38 “Textiles“. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by July 2001, and conflicting national standards shall be withdrawn at the latest by July 2001. According to the CENK
20、ENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden,
21、Switzerland and the United Kingdom. STD.BSI BS EN IS0 1172L-II-ENGL ZOO3 D 1b24bb7 0877156 i92 Page 4 EN IS0 11721-1 2001 I nt rod ucti on Cellulose-containing textiles are considered resistant to attack by microorganisms present in soil if their structure, appearance and tensile strength are not es
22、sentially altered after a soil burial test. lhe resistance to deterioration is assessed by measuring the relative reduction in tensile strength between buried and unburied specimens. If an assessment of long term resistance is required, the procedure described in IS0 11721-2 (in preparation) is appl
23、icable. Due to the biological nature of the soil burial test, and the fact that the test soil cannot be precisely standardized, this standard is only intended to assess the resistance of a fabric to microorganisms after comparing the performance of specimens with and without a finish. STDmBSI BS EN
24、IS0 LL72L-L-ENGL 2OOL W Lb24667 0877L57 627 W Page 5 EN IS0 1 1721 -1 2001 1 Scope This standard specifies a method for determination of the resistance of chemically-pretreated textiles to the action of microorganisms present in soil in comparison with untreated textiles. This method is applicable t
25、o flat textiles made of cellulosic-containing yarns (tentage, tarpaulins, webbing and tapes) that will typically come into contact with soil during use. Due to the inherent resistance of most synthetic fibres to attack by microorganisms, fabrics containing a high proportion of synthetic fibres can o
26、nly be judged by these methods for changes in structure and appearance. Although this method allows good reproducibility of results, it is intended to show comparative performance rather than provide absolute values. NOTE Heavy tarpaulin fabrics and webbing may be of such a structure that samples wi
27、thout finish are resistant within a 14 days soil burial period. Also in such cases the decay rate of the untreated sample determines the length of the burial period. 2 Normative references This International Standard incorporates by dated or undated reference, provisions from other publications. The
28、se 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 International Standard only when incorporated in it by amendment or revision. For
29、undated references the latest edition of the publication referred to applies (including amendments). IS0 139, Texfiles - Standard atmospheres for conditioning and testing IS0 7218, Microbiology of food and animal feeding stuffs - General rules for microbiological examinations IS0 8022, Surface activ
30、e agents - Determination of wefting power by immersion IS0 13934-1, Texfiles - Tensile properties of fabrics - Part 1: Determination of maximum force and elongation at maximum force using the strip method 3 Safety precautions This method requires the use of viable mould propagules and ambient condit
31、ions which promote mould and bacterial growth. Any safety precautions and personal hygiene for microbiological examinations shall be followed (e.9. IS0 7218). 4 Principle Cellulose-containing textiles are considered resistant to attack by microorganisms present in soil if their structure, appearance
32、 and tensile strength remain essentially unaltered during a soil burial test. This method compares the relative reduction in tensile strength of specimens before and after soil burial. The method is used to compare finished and unfinished specimens of the same quality. The specimens are buried in a
33、test soil of controlled water-holding capacity and optimum water content for microbial activity. The finished and unfinished specimens are buried for a period of up to nine days, Page 6 EN IS0 11 721 -1 :2001 when the specimens without a finish show a reduction in tensile strength of approximately 8
34、0 %. At this stage the tensile strength loss of the finished and unfinished specimens are determined. The limitation of the soil burial test to a maximum nine days for the unfinished specimens to lose 80 % of their initial tensile strength serves as validation of the microbial activity of the test s
35、oil and the test system. NOTE 1 The duration of the test will vary depending on the activity of the soil. It is important to note that the reduction in strength between specimens with and without an applied finish is the critical factor, and not the duration of the test. A soil of lower activity wil
36、l produce the same result as one of higher activity, but the test will take longer. NOTE 2 A fixed-time soil burial test may allow an undefined attack on the cellulosic material. The reproducibility of results for reduction of tensile strength of finished and unfinished test specimens is the critica
37、l factor. 5 Apparatus and reagents 5.1 150 mm deep. Containers, of unglazed pottery or reinforced cement (asbestos substitute materials), at least Containers with more than 150 mm filling height shall have holes at the base for exchange of air. 5.2 Test soil, commercial grade compost or compost-cont
38、aining garden soil as purchased in the manufacturers original packing may be used. Fresh compost shall be mixed with compost previously used for soil burial testing or with soil previously acclimatized at equilibrium moisture to (95 to 99) % relative humidity and thoroughly mixed before use. The tes
39、t soil shall be sufficient to fill all the containers used in a series of tests, and shall be fine- grained, free-flowing and not sticky or lumpy. The water-holding capacity (WHC) (or maximum moisture retention capacity) of the test soil shall be determined and the water content (WC) shall be (60 f
40、5) % of the WHC. The pH of the test soil shall be between 4,O and 7,5. Prepare the test soil of known WHC for moisture content determination before commencing the test. If the soil is too moist, let it air dry. If the soil is too dry, overspray it to a WC of (60 * 5) % of the WHC. NOTE 1 See annex A
41、 for a suitable method. NOTE 2 60 % of WHC guarantees best microbial activity and optimum water activity for microbial growth. The water content necessary for one soil is therefore always prescribed as approximately 60 % of WHC of the sample. Lower humidity slows down or prevents rotting; higher hum
42、idity may lead to unevenness of results and anaerobic processes. NOTE 3 insufficient moisture distribution. Soil blends with high clay or loam contents are unsuitable because of low air permeability and 5.3 relative humidity of the air at (29 f 1) OC. Incubator, for incubation of the soil burial con
43、tainers during the entire test at (95 to 100) % 5.4 Balance, for determining WC and WHC of the test soil. 5.5 Oven, for drying soil samples at (104 * 2) OC and for drying specimens at (45 * 5) OC. 5.6 tensile strength determination. Ethanolhater (70 Yd30 % volume fraction) solution, for cleaning the
44、 buried specimens before 5.7 Microscope (x30 to x40 magnification), for visual examination of the buried specimens. STD-ES1 ES EN IS0 LL72II-L-ENGL 2OOL II624669 0897159 4TL 6 Page 7 EN IS0 1 1721 -1 :2001 6 Test specimens 6.1 Preparation Prepare test specimens from the middle of the laboratory samp
45、les by cutting the specimens lengthwise from the warp direction of the fabric. With blended fabrics and/or if agreed between the interested parties, test specimens may be taken from the weft direction. Blended fabrics containing 100 % cellulose fibres in the warp or weft direction shall be sampled b
46、y taking the test specimens from the 100 % cellulose direction only. Cut test specimens 300 mm long and 30 mm wide and then fray down both sides to give a central width of 20 mm (see IS0 13934-1). For fabrics that are too narrow to allow the specified specimen width, carry out the test at full fabri
47、c width. NOTE quantities of untreated fabrics required and the capacity of the soil containers. An effective width of 20 mm and distance between the jaws of 100 mm is used due to the large 6.2 Number of specimens For each test prepare 20 test specimens, 10 for testing without burial and 10 for testi
48、ng after soil burial. For determination of the soil burial duration, .e. time at which there is an 80 % reduction in strength in the control specimens without applied finish, prepare at least 20 control specimens of the unfinished test sample. These control specimens shall be of the same fabric qual
49、ity, .e. same yarn(s), mass per unit area. constructiodweave, preparation and dyeing with no additional applied finish such as a water repellent, softener or biocide. NOTE For blends with synthetic fibres, see 8.3. 7 Leaching procedure Unless otherwise agreed between the interested parties, subject all the finished and unfinished test specimens (.e. those for testing without soil burial and those for testing after soil burial) to the following leaching procedure. Exclude the control specimens from the leaching procedure. Hold the test specimens under fr
