1、STD-BSI BS EN IS0 7073-2-ENGL 1777 1b24bb7 Ob00070 b27 BRITISH STANDARD Textiles - Test methods for nonwovens Part 2. Determination of thickness * * u, The European Standard EN IS0 907%2 : 1996 has the status of a British Standard ICs 59.080.30 BS EN IS0 9073-2 1997 NO COPYING WITHOUT BSI PERMISSION
2、 EXCEPT AS PERMITTED BY COPYRIGH LAW _ _ STD-BSI BS EN IS0 7073-2-ENGL 1777 m 1b2qbb7 Ob0007L 5b3 AmdNo. BS EN IS0 9073-2 : 1997 Date Text affected This British Standard, having been pmpared under the direction of the Sector Board for Matwials and Chemicals, was pubiished under the authority of the
3、Standards Boar and comes into effect on 15 March 1997 Q BSI 1997 Committees responsible for this British Standard The preparation of this British Standard was entrusted to Technical Committee TCIL%, Physical testing of textiles, upon which the following bodies were represented: Association of Consul
4、ting Scientists Association of Suppliem to the British Clothing Industry British Apparel and Textile Confederation British Measurement and Testing Association British Polyolen Textiles Association British Read Consortium British Textile Machinery Association British Textile Technology Group British
5、Throwsters Association intemational Wool Secretariat Ministry of Defence Royal Pharmaceutical Society of Great Britain SATRA Footwear Technology Centre Soap and Detergent Industry Association Society of Dyers and Colourists Textile Finishers Association Textile Institute United Kingdom AccrediMon Se
6、rvice The following bodies were also represented in the drafting of the standard, through subcommittees and panels British Clothing Industry Association Department of Health European sterilization Packaging Association (UK) Guild of Hospital Pharmacists institute of Sterile Services Management Medic
7、al Sterile Products Association National Wool Textile Export Corporation Surgical Dressings Manufacturers Association The foiiowing BSI references relate to the work on this standard: committee wference “Cy24 Draft for comment 93B07687 DC iSBN O 680 2W32 X STD-BSI BS EN IS0 7073-2-ENGL 1777 9 lb2Lib
8、b7 Ob00072 4TT BS EN IS0 9073-2 : 1997 - Contents Committes responsible Page Inside front cover Nationai foreword ii Foreword 2 Introduction Method 1 Scope 2 Normative references 3 Defnitions 4 principle 0 Apparatus 6 sampling 2 7 Preparation and conditioning of test pieces 5 8 Prehninaryprocedure 9
9、 Procedure 10 Expression of results 11 Testreport Annex ZA (normative) Normative references to intedonal publications with their relevant European publications 8 Figures 1 2 Test apparatus for bulky nonwovens with a maximum thickness of 20 mm Test apparatus for bulky nonwovens with a thickness great
10、er than 20 mm 4 5 O BSI 1997 1 STD-BSI BS EN IS0 7073-2-ENGL A777 LbZYbb7 ObDOOS3 33b BS EN IS0 9073-2 : 1997 National foreword This British Standard has been prepared by Technic4 Committee TCIL24 and is the English ianguage version of EN IS0 9073-2 : 1996 Textiles - Test methods for non wom Part 2:
11、 Determination of thiclcness published by the European Committee for Standardization (CEN). It is identical with IS0 9073-2 : 1995 published by the International Organization for Standardization (ISO). This standard supersedes BS EN 29073-2 : 1992, which is withdrawn. Cross-references Publication re
12、ferred to EN 20139 : 1992 (Is0 139: 1973) EN IS0 186 : 1996 (Is0 186: 1994) Corresponding British Standard BS EN 20139 : 1992 T-. Standara atmospheres fm conditioning and testing BS EN Is0 186 : 1996 Paper and boaions of the following countries are bound to implement this European Stan- Austria, Bel
13、gium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Itaiy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland, and the United Kingdom. NOTE. Normative references to htemaonal Standards are iisted in annex ZA (normative). Introduction Although nonwovens are classied
14、within the textile industry, it should be recognized that nonwovens technologicaily she characteristics not oniy with textile products but also with paper andor plastic products. There is an existing international textile test for the determination of thickness, IS0 5084 : Textiles - Detemzination o
15、f the thichnas of textiles and textile products (other than tertilemor coverings, nonwovens and geotextes) to be published (revision of IS0 5084 : 1977)l. However, in order to meet the specific needs of nonwovens, alternative requirements to those listed in IS0 5084 are specified in this part of IS0
16、 9073. These are a) a different sampling procedure; b) specific pressures at which to test normal and bdky nonwovens; c) a specific area for the size of the presser-foot; d) a shorter time to note the gauge reading. O BSI 1997 STD-BSI BS EN IS0 7073-2-ENGL 1997 LbZLibbS Ob0007b OLi5 = Page 3 EN IS0
17、9073-2 : 1996 Textiles - Test methods for nonwovens - Part 2: Determination of thickness 1 Scope This part of IS0 9073 specifies methods for the de- termination of the thickness, when under a specific pressure, of normal and bulky nonwoven textiles. 2 Normative references The following standards con
18、tain provisions which, through reference in this text, constitute provisions of this part of IS0 9073. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this part of IS0 9073 are encouraged to investigate the poss
19、ibility of applying the most recent editions of the standards indicated below. Members of IEC and IS0 maintain registers of currently valid International Standards, IS0 139:1973, Textiles - Standard atmospheres for conditioning and testing. IS0 186: 1994, Paper and board - Sampling to deter- mine av
20、erage quality. 3 Definitions For the purposes of this part of IS0 9073, the follow- ing definitions apply. 3.1 bulky nonwoven: Nonwoven textile which is compressible by 20 % or more when the pressure applied changes from 0,l kPa to 0,5 kPa. 3.2 thickness: Distance between the face and back of a nonw
21、oven, measured as the distance between a reference plate on which the nonwoven rests and a parallel presser-foot that is applying a pressure to the nonwoven. 4 Principle Measurement of the thickness of a nonwoven as the distance between the reference plate on which the nonwoven rests and a parallel
22、presser-foot that exerts a specified pressure on the area under test. 5 Apparatus 5.1 For normal nonwovens 5.1.1 Two circular horizontal plates, attached to a stand, comprising an upper plate, or presser-foot, ca- pable of moving vertically and having an area of ap- proximately 2 500 mm2, and a refe
23、rence plate having a plane surface of diameter at least 50 mm greater than that of the presser-foot. 5.1.2 Measuring device, having a scale with 0,Ol mm graduations, for measuring the distance be- tween the reference plate and the presser-foot (5.1.1). 5.2 For bulky nonwovens with a maximum thicknes
24、s of 20 mm NOTE 1 in figure I. An example of suitable test apparatus is shown STD-BSI BS EN IS0 9073-2-ENGL 1997 m Lb211bb7 Ob00097 TBL m Page 4 EN IS0 9073-2 : 1996 Test piece Dial-gauge - II I Balance counterweight I/ I- I I Elbow lever 11 - 12= 1, Figure 1 - Test apparatus for bulky nonwovens wit
25、h a maximum thickness of 20 mm 5.2.1 Vertical reference plate, with an area of 1 O00 mm2, presser-foot with an area of 2 500 mm2, and equipment to suspend the test piece vertically between them. 5.2.2 Elbow lever, with both arms of equal length, attached to the reference plate and capable of being b
26、alanced using a counterweight so that it exerts a very small force to the left when the balance weight (5.2.4) is not in position. The geometry of the lever is such that the balance weight gives a measuring pressure of 0.02 kPa. 5.2.3 Electrical contacts, which, when closed, cause a small bulb to be
27、come illuminated. 5.2.4 Balance weight, with a mass of 2.05 g f 0,05 g, which, when in position, causes the contacts (5.2.3) to separate and extinguish the bulb. 5.2.5 Screw, which, when turned, drives the presser-foot to the left and presses the test piece with increasing pressure against the refer
28、ence plate until the force on the balance is overcome and the bulb becomes illuminated. 5.2.6 Dial-gauge, to indicate the distance, in milli- metres, between the reference plate and the presser-foot corresponding to the thickness of the test piece at the pressure applied. 5.3 For bulky nonwovens wit
29、h a thickness greater than 20 mm NOTE 2 in figure2. An example of suitable test apparatus is shown * v) * STD-BSI BS EN IS0 7073-2-ENGL 1777 m 1b29bb7 Ob00078 718 Page 6 EN IS0 9073-2 1996 Measuring Vertical scale M Test piece I IJ Base plate Figure 2 - Test apparatus for bulky nonwovens with a thic
30、kness greater than 20 mm 5.3.1 Horizontal square base plate, measuring 300 mm x 300 mm, having a smooth surface. In the centre of one side is a vertical scale M with gradu- ations in millimetres, on which is placed a horizontal measuring bar B, which is movable in a vertical di- rection. This bar su
31、pports an adjustable vertical probe T at a distance of 100 mm from the vertical scale. NOTE 3 The vertical probe T should be above the centre of the measuring plate P when in use (see 9.3.21, such that the measuring plate is not in contact with the scale. 5.3.2 Square measuring plate P, measuring (2
32、00 mm f 0,2 mm) x (200 mm f 0,2 mm) and a mass of 82 g f 2 g, made of glass with a thickness of 0,7 mm, which can be brought to the required mass by the addition of weight-pieces to give a measuring pressure of 0,02 kPa. NOTE 4 If additional weight-pieces are necessary, they should be distributed sy
33、mmetrically so that there is even pressure over the whole area of the plate. 5.4 Stopwatch. 6 Sampling Carry out sampling in accordance with IS0 186, en- suring that the areas from which the specimens are taken have no visible flaws and are not creased. NOTE 5 This method of sampling recognizes and
34、makes provisions for “anisotropy“ (differences in properties along various directions, principally machine and cross directions) in the final specimens. However, these specimens are ran- dom representatives of the material and in some cases it may be desirable to investigate systematic variations of
35、 properties (including anisotropy), for example across the width, or in certain positions along the length, of a given reel. In all such cases, special provisions should be agreed between purchaser and vendor and recorded in the test re- port. A procedure for more detailed examination of varia- bili
36、ty within a given batch of material is available in TAPPI T 74-05-1 1 and may be found helpful. This publication may be obtained from: The Technical Association of Pulp and Paper industries, 1 Dunwoody Park, Atlanta, GA 30338, USA. 7 Preparation and conditioning of test pieces 7.1 If the method of t
37、est A, B or C (see clause 913 has not been determined, cut 10 prelimi- nary test pieces, each having an area larger than 2 500 mm , and, after conditioning, carry out the pro- cedure described in clause 8. 7.2 having an area larger than 2 500 mm2. For normal nonwovens, cut 10 test pieces, each 7.3 F
38、or bulky nonwovens with a maximum thick- ness of 20 mm, cut 10 test pieces, each having an area of (130 mm f 5 mm) x (80 mm f 5 mm). 7.4 For bulky nonwovens with a thickness greater than 20 mm, cut 10 test pieces, each having an area of (200 mm f 0.2 mm) x (200 mm i 0.2 mm). 7.5 Condition the test p
39、ieces as specified in IS0 139. STD-BSI BS EN IS0 7073-2-ENGL 1777 1b2YbbS Ob00077 85Y Page 6 EN IS0 9073-2 1996 8 Preliminary procedure 8.1 for testing (see IS0 139). Carry out the tests in the standard atmosphere 8.2 Using the apparatus specified in 5.1, adjust the load on the presser-foot accordin
40、g to the manufac- turers instructions to give a uniform pressure of 0,l kPa and set the measuring device to zero. 8.3 Raise the presser-foot and place the preliminary test piece (7.1) carefully, without tension, on the ref- erence plate. Ensure the test piece is positioned cen- trally with respect t
41、o the presser-foot. Lower the presser-foot carefully until contact is made with the test piece. 8.4 Leave in contact for 10 s, adjust the measuring device to measure the thickness of the sample, and note the reading, in millimetres. 8.5 pieces. Repeat the procedure for the other nine test 8.6 Adjust
42、 the load on the presser-foot according to the manufacturers instructions to give a uniform pressure of 0.5 kPa and adjust the measuring device to zero. Repeat the measurements on the same 10 test pieces. 8.7 Calculate the difference between the results at pressures of 0,l kPa and 0,5 kPa for each p
43、reliminan/ test piece and determine the mean thickness of the nonwoven. NOTE 6 It is recommended that reference specimens of known thickness are used to check the testing apparatus periodically. 8.8 Test the nonwovens which were compressed by 20 % of their thickness in this preliminary pro- cedure i
44、n accordance with the procedure given in 9.1 (method A) and others in accordance with either 9.2 (method BI or 9.3 (method C), depending upon whether they have a thickness of less than or greater than 20 mm. NOTE 7 When different samples, close to the limits of each method, are to be compared, the c
45、omparison should be made using the same method. 9 Procedure 9.1 Method A for normal nonwovens 9.1.1 Carry out the tests in the standard atmosphere for testing (see IS0 139). 9.1.2 Using the apparatus specified in 5.1, adjust the load on the presser-foot according to the manufac- turers instructions
46、to give a uniform pressure of 0,5 kPa and set the measuring device to zero. 9.1.3 Raise the presser-foot, and position the test piece (7.2) centrally with respect to the presser-foot, and without tension, on the reference plate. 9.1.4 Lower the presser-foot carefully until contact is made with the t
47、est piece, and leave in contact for 10 s. 9.1.5 Adjust the measuring device and note the reading, in millimetres. 9.1.6 Repeat the procedure on the other nine test pieces. 9.2 Method B for bulky nonwovens with a maximum thickness of 20 mm 9.2.1 Carry out the tests in the standard atmosphere for test
48、ing (see IS0 139). 9.2.2 Using the apparatus specified in 5.2, check that the sensitivity and zero are adjusted correctly when the balance weight of 2,05 g f 0,05 g is in position. 9.2.3 Move the presser-foot to the right and fasten the test piece (7.3) on the bearer pin so that it is sus- pended be
49、tween the reference plate and the presser-foot. 9.2.4 Move the presser-foot slowly to the left by means of the screw until the bulb is illuminated. 9.2.5 After 10 s, read the thickness, in millimetres, . from the dial-gauge, to the nearest 0,l mm. NOTE 8 If further compression of the test piece during the 10 s period causes the contact to separate, the presser-foot should be adjusted to illuminate the bulb again before the thickness is read from the gauge. 9.2.6 Repeat the procedure for the other nine test pieces. STD-BSI BS EN IS0
