1、BRITISH STANDARDBS EN ISO 9073-14:2007Textiles Test methods for nonwovens Part 14: Coverstock wetbackThe European Standard EN ISO 9073-14:2007 has the status of a British StandardICS 59.080.30g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g50g49g3g40g59g38g4
2、0g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58BS EN ISO 9073-14:2007This British Standard was published under the authority of the Standards Policy and Strategy Committee on 30 March 2007 BSI 2007ISBN 978 0 580 50383 2National forewordThis British Standa
3、rd was published by BSI. It is the UK implementation of EN ISO 9073-14:2007. It is identical with ISO 9073-14:2006.The UK participation in its preparation was entrusted to Technical Committee TCI/24, Physical testing of textiles.A list of organizations represented on TCI/24 can be obtained on reques
4、t to its secretary.This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application.Compliance with a British Standard cannot confer immunity from legal obligations.Amendments issued since publicationAmd. No. Date CommentsEURO
5、PEAN STANDARDNORME EUROPENNEEUROPISCHE NORMEN ISO 9073-14February 2007ICS 59.080.30English VersionTextiles - Test methods for nonwovens - Part 14: Coverstockwetback (ISO 9073-14:2006)Textiles - Mthodes dessai pour nontisss - Partie 14:Remouillage de lenveloppe (ISO 9073-14:2006)Textilien - Prfverfah
6、ren fr Vliesstoffe - Teil 14: Auflagen(ISO 9073-14:2006)This European Standard was approved by CEN on 21 January 2007.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without an
7、y alteration. Up-to-date lists and bibliographical references concerning such nationalstandards may be obtained on application to the CEN Management Centre or to any CEN member.This European Standard exists in three official versions (English, French, German). A version in any other language made by
8、 translationunder the responsibility of a CEN member into its own language and notified to the CEN Management Centre has the same status as theofficial versions.CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland,France, Germ
9、any, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMIT EUROPEN DE NORMALISATIONEUROPISCHES KOMITEE FR NORMUNGMana
10、gement Centre: rue de Stassart, 36 B-1050 Brussels 2007 CEN All rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN ISO 9073-14:2007: EForeword The text of ISO 9073-14:2006 has been prepared by Technical Committee ISO/TC 38 “Textiles” of the Int
11、ernational Organization for Standardization (ISO) and has been taken over as EN ISO 9073-14:2007 by Technical Committee CEN/TC 248 “Textiles and textile products“, the secretariat of which is held by BSI. This European Standard shall be given the status of a national standard, either by publication
12、of an identical text or by endorsement, at the latest by August 2007, and conflicting national standards shall be withdrawn at the latest by August 2007. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this Eur
13、opean Standard: Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Ki
14、ngdom. Endorsement notice The text of ISO 9073-14:2006 has been approved by CEN as EN ISO 9073-14:2007 without any modifications. EN ISO 9073-14:2007Reference numberISO 9073-14:2006(E)INTERNATIONAL STANDARD ISO9073-14First edition2006-04-01Textiles Test methods for nonwovens Part 14: Coverstock wetb
15、ack Textiles Mthodes dessai pour nontisss Partie 14: Remouillage de lenveloppe EN ISO 9073-14:2007ii iiiContents Page Foreword iv 1 Scope . 1 2 Normative references . 1 3 Principle. 1 4 Material and reagents. 2 5 Apparatus 2 6 Procedure 3 7 Test report . 5 8 Useful additional information 5 Annex A (
16、informative) Precision . 8 Bibliography . 9 EN ISO 9073-14:2007iv Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical
17、committees. Each member body interested in a subject for which a technical committee has been established 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. ISO collaborates closely with
18、the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2. The main task of technical committees is to prepare International Standards. Draft Interna
19、tional Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. Attention is drawn to the possibility that some of the elements of this document may b
20、e the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. ISO 9073-14 was prepared by Technical Committee ISO/TC 38, Textiles. ISO 9073 consists of the following parts, under the general title Textiles Test methods for nonwovens: Part 1: Determi
21、nation of mass per unit area Part 2: Determination of thickness Part 3: Determination of tensile strength and elongation Part 4: Determination of tear resistance Part 6: Absorption Part 7: Determination of bending length Part 8: Determination of liquid strike-through time (simulated urine) Part 9: E
22、valuation of drapability including drape coefficient Part 10: Lint and other particles generation in the dry state Part 11: Run-off Part 12: Demand absorbency Part 13: Repeated liquid strike-through time Part 14: Coverstock wetback The following parts are under preparation: Part 15: Evaluation of ai
23、r permeability Part 16: Evaluation of water resistance (hydrostatic pressure test) EN ISO 9073-14:2007v Part 17: Evaluation of water penetration (spray impact) test Part 18: Determination of breaking strength and elongation of nonwoven materials using the grab tensile test EN ISO 9073-14:2007blank1T
24、extiles Test methods for nonwovens Part 14: Coverstock wetback 1 Scope This part of ISO 9073 specifies a test method to examine the ability of diaper coverstock to resist the transport back onto the skin of a liquid which has already penetrated the coverstock. This test corresponds with the repeated
25、 liquid strike-through time described in ISO 9073-13. This test method is intended for quality control and is designed for comparison of wetback for different nonwoven coverstocks and treatments. It does not simulate in-use conditions for finished products. 2 Normative references The following refer
26、enced documents are indispensable for the application 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 186, Paper and board Sampling to determine average quality ISO 5
27、636-1, Paper and board Determination of air permeance (medium range) Part 1: General method ISO 9073-6, Textiles Test methods for nonwovens Part 6: Absorption ISO 9073-13, Textiles Test methods for nonwovens Part 13: Repeated liquid strike-through time 3 Principle A piece of coverstock is placed ove
28、r a standard absorbent medium (10 plies of filter paper) which is then loaded three times according to the repeated STT method proposed in ISO 9073-13 with a specific quantity of simulated urine. After the third dose, a simulated baby weight (SBW) is placed onto the coverstock and absorbent medium t
29、o ensure even spreading of the liquid. A pre-weighed pick up paper is then placed on the coverstock and the simulated baby weight (SBW) is again put on top. The mass of liquid absorbed by the pick up paper is defined as wetback. EN ISO 9073-14:20072 4 Material and reagents 4.1 Absorbent pad, consist
30、ing of ten plies of filter paper (size 100 mm 100 mm) with the test side upwards, as specified by the supplier. The mean strike-through time, in 10 replicate determinations without the nonwoven, shall be within (1,7 0,3) s. The liquid absorption capacity of paper, as determined by ISO 9073-6, shall
31、be 480 % minimum. 4.2 Simulated urine, consisting of a 9 g/l solution of sodium chloride in deionized water with a surface tension of (70 2) mN/m at (23 2) C. This surface tension should be checked before each series of tests, as surface tension may change during storage. 4.3 Pick-up paper, 125 mm 1
32、25 mm square. Paper characteristics: the mass per unit area of paper shall be (90 4) g/m2; and the air flow resistance, as determined by ISO 5636-1, shall be (1,9 0,3) kPa. 5 Apparatus 5.1 Burette, of 50 ml capacity, with a supporting stand, or 5 ml pipette. 5.2 Funnel, fitted with a magnetic valve,
33、 giving a rate of discharge of 25 ml in (3,5 0,25) s. 5.3 Ring stand to support the funnel. 5.4 Strike-through plate (see Figures 2 and 3) constructed of 25 mm thick transparent acrylic sheet, of total mass (500 5) g, fitted with corrosion-resistant electrodes consisting of 1,6 mm diameter platinum
34、or stainless steel wire set in grooves of cross-section 4,0 mm 7,0 mm cut in the base of the plate and fixed with quick-setting epoxy resin. The electrodes shall be positioned as shown in Figures 2 and 3. The plate surface, electrode surface and the star-shaped orifice shall be clean and free from d
35、eposit or particulate matter. Clean regularly, e.g. with mildly abrasive car polish and dry cloth, and/or hot water. 5.5 Base plate, of transparent acrylic sheet, approximately 125 mm 125 mm square and 5 mm thick. 5.6 Electronic timer measuring to the nearest 0,01 s. 5.7 Simulated baby weight (SBW),
36、 consisting of: a weight, stainless steel base 10 cm 10 cm including a handle, of total mass (4 000 20) g; a polyurethane (PU) foam rubber, 10 cm 10 cm 2 cm height (as described in 8.4); a polyethylene (PE) film, 25 m thick. Wrap the PE film around the foam, secure the film in place with tape then t
37、ape the film and foam to the weight (see Figure 1). EN ISO 9073-14:20073Key 1 tape 2 4 kg weight 3 PU foam 4 foam plus PE film 5 film Figure 1 Simulated baby weight 6 Procedure This test is conducted in conjunction with the repeated strike-through test (see ISO 9073-13) as follows: 6.1 Set up the ri
38、ng stand holding the funnel. Make sure that the timer and conductivity detector are switched on, and electrodes are connected. 6.2 Cut the nonwoven test pieces, 125 mm 125 mm, selected in accordance with ISO 186, if applicable. 6.3 Prepare one set of 10 plies of filter paper, stacking the paper plie
39、s on top of each other, test side upwards. 6.4 Weigh the set of 10 plies of filter paper and place them with the test side upwards on the strike-through baseplate. The mass (m) of the filter paper will be used as a parameter to determine the total quantity of liquid (Q) required for the wetback test
40、. The quantity of liquid (Q) will be calculated by multiplying m by the loading factor (LF) of the filter paper (see 8.1). The recommended loading factor is 3,30. 6.5 Place the nonwoven test piece on top of the set of 10 plies of filter paper. Position the nonwoven such that the direction of liquid
41、flow during the test corresponds with the intended use of the nonwoven. For example, for personal hygiene products, the side of the nonwoven that is intended to be in contact with the users skin shall be facing upwards. 6.6 Place the strike-through plate on the top of the nonwoven with the centre of
42、 the plate approximately over the centre of the test piece. Centre the funnel over the orifice in the plate. EN ISO 9073-14:20074 6.7 Adjust the height of the funnel such that the dispensing tip is (45 1) mm above the top of the instrument baseplate. For Lister equipment 1), this corresponds to the
43、minimum position of the head, as defined by the vertical positioning ring. 6.8 Check whether the timer display shows zero. If not, reset. 6.9 Dispense with the pipette or burette 5,0 ml of test liquid into the funnel, while keeping the discharge valve of the funnel closed. 6.10 Open the magnetic dis
44、charge valve of the funnel to discharge the 5,0 ml of liquid. The initial flow of liquid will complete the circuit and start the electronic timer. The timer will stop when the liquid has penetrated into the nonwoven and dropped below the level of the electrodes in the strike-through plate. At that t
45、ime, start the stopwatch. 6.11 Record the time indicated by the electronic timer (STT-1). 6.12 Use the stopwatch to record a time interval of 60 s. During this period, dispense a fresh aliquot of 5,0 ml of test liquid into the funnel. 6.13 As the stopwatch reads 60 s, repeat steps 6.10 to 6.12 for m
46、easuring the STT of the second dose (STT-2). 6.14 As the stopwatch reads 60 s, repeat steps 6.10 and 6.11 for measuring the STT of the third dose (STT-3). 6.15 Add an additional quantity of test liquid (Qadd) in order to reach the specified quantity (Q): Qadd= Q 15 (expressed in millilitres) 6.16 Re
47、move the baseplate with the sample and filter paper from the strike-through apparatus. 6.17 Gently put the 4 kg weight assembly (5.7) onto the sample. 6.18 The weight (5.7) remains in place for 3 min to ensure even diffusion of the liquid. 6.19 Remove the weight (5.7) without disturbing the nonwoven
48、 test piece. 6.20 Weigh two layers of pick-up paper to an accuracy of 0,001 g, record the mass (m1) and place them on the test piece. 6.21 Remove residual liquid by wiping the contact surface of the weight (5.7) with a dry tissue, before gently replacing it over the pick up paper. A loading speed sh
49、ould be applied in such a way that the last 5 cm displacement takes (5 1) s (see 8.3). 6.22 The weight remains in place for 2 min 2 s, during which time wetback has occurred. 6.23 Remove the weight and reweigh the pick-up paper (m2) to an accuracy of 0,001 g. 6.24 Calculate the wetback value: mWB= m2 m1(expressed in grams). 6.25 Repeat for the required number of test pieces. A minimum of three tests on test pieces from each sample is recommended. NOTE If ST
