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1、| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | BRITISH STANDARD BS EN 12625-5:1999 The Eu
2、ropean Standard EN 12625-5:1999 has the status of a British Standard ICS 85.080 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW Tissue paper and tissue products Part 5: Determination of wet tensile strength Licensed Copy: sheffieldun sheffieldun, na, Sat Oct 28 09:03:33 GMT+00
3、:00 2006, Uncontrolled Copy, (c) BSI This British Standard, having been prepared under the direction of the Sector Committee for Materials and Chemicals, was published under the authority of the Standards Committee and comes into effect on 15 July 1999 BSI 07-1999 ISBN 0 580 32454 0 BS EN 12625-5:19
4、99 Amendments issued since publication Amd. No.DateComments National foreword This British Standard is the English language version of EN 12625-5:1999. The UK participation in its preparation was entrusted to Technical Committee PAI/10, Paper towels and toilet paper, which has the responsibility to:
5、 aid enquirers to understand the text; present to the responsible European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. A list of organizations repres
6、ented on this committee can be obtained on request to its secretary. Cross-references The British Standards which implement international or European publications referred to in this document may be found in the BSI Standards Catalogue under the section entitled International Standards Correspondenc
7、e Index, or by using the Find facility 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
8、 confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, the EN title page, pages 2 to 6, an inside back cover and a back cover. Licensed Copy: sheffieldun sheffieldun, na, Sat Oct 28 09:03:33 GMT+00:00 2006, Uncontrolled Copy, (c) BSI C
9、EN European Committee for Standardization Comite Europe en de Normalisation Europa isches Komitee fu r Normung Central Secretariat: rue de Stassart 36, B-1050 Brussels 1999 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 12625-5:19
10、99 E EUROPEAN STANDARDEN 12625-5 NORME EUROPE ENNE EUROPA ISCHE NORM January 1999 ICS 85.080 Descriptors: home sanitary articles, paper, paper products, tests, tensile tests, tensile strength, humidity, wetting, tensile testing machines, sampling, procedure English version Tissue paper and tissue pr
11、oducts Part 5: Determination of wet tensile strength Papier tissue et produits tissues Partie 5: De termination de la re sistance a la rupture par traction a le tat humide Tissue-Papier und Tissue-Produkte Teil 5: Bestimmung der breitenbezogenen Nabruchkraft This European Standard was approved by CE
12、N on 2 December 1998. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standard
13、s may be obtained on application to the Central Secretariat or to any CEN member. This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the
14、 Central Secretariat has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United K
15、ingdom. Licensed Copy: sheffieldun sheffieldun, na, Sat Oct 28 09:03:33 GMT+00:00 2006, Uncontrolled Copy, (c) BSI Page 2 EN 12625-5:1999 BSI 07-1999 Foreword This European Standard has been prepared by Technical Committee CEN/TC 172, Pulp, paper and board, the Secretariat of which is held by DIN. T
16、his 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 1999, and conflicting national standards shall be withdrawn at the latest by July 1999. EN 12625 contains the following parts: Part 2: Procedure
17、s for sampling and conditioning (currently available as ENV); Part 3: Determination of thickness, bulking thickness and apparent bulk density; Part 4: Determination of tensile strength, stretch at break and tensile energy absorption; Part 5: Determination of wet tensile strength; Part 6: Determinati
18、on of grammage. The following parts are in preparation: Part 1: General guidance on terms; Part.: Water absorption rate and water absorption capacity (basket method); Part.: Optical properties (whiteness, opacity, colour). In addition, it is expressly stated, that the detection of impurities and con
19、traries in tissue paper and tissue products should be applied according to the following European Standard: prEN ISO 15755, Paper and board Estimation of contraries. (ISO/FDIS 15755:1998). For the determination of moisture content in tissue paper and tissue products, EN 20287 should be applied. Acco
20、rding to the CEN/CENELEC 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, Portuga
21、l, Spain, Sweden, Switzerland and the United Kingdom. Contents Page Foreword2 1Scope3 2Normative references3 3Definitions3 4Principle3 5Apparatus3 6Sampling4 7Preparation of test pieces4 8Procedure4 9Calculation6 10Test report6 Licensed Copy: sheffieldun sheffieldun, na, Sat Oct 28 09:03:33 GMT+00:0
22、0 2006, Uncontrolled Copy, (c) BSI Page 3 EN 12625-5:1999 BSI 07-1999 1 Scope This part of EN 12625 specifies a test method for the determination of the wet tensile strength of tissue paper and tissue products after wetting using a tensile testing apparatus operating with a constant rate of elongati
23、on. 2 Normative references This European Standard incorporates by dated or undated reference, provisions from other publications. These normative references are cited at the appropriate places in the text and the publications are listed hereafter. For dated references, subsequent amendments to or re
24、visions of any of these publications apply to this European Standard only when incorporated in it by amendment or revision. For undated references the latest edition of the publication referred to applies. ENV 12625-2, Tissue paper and tissue products Procedures for sampling and conditioning. EN 126
25、25-4, Tissue paper and tissue products Determination of tensile strength, stretch at break and tensile energy absorption. EN ISO 536, Paper and board Determination of grammage. (ISO 536:1995) EN ISO 1924-2, Paper and board Determination of tensile properties Constant rate of elongation method. (ISO
26、1924-2:1994) 3 Definitions For the purposes of this standard, the following definitions apply. 3.1 wet tensile strength maximum tensile force supported by the unit width of a wet test piece of tissue paper or tissue product until the onset of rupture in a tensile test 3.2 relative wet tensile streng
27、th ratio in percent of the tensile strength of the wet tissue paper or wet tissue product to the tensile strength of the same tissue paper or tissue product in the dry, conditioned state (according to EN 12625-4 and EN ISO 1924-2) 4 Principle 4.0 General A test piece of a tissue paper or a tissue pr
28、oduct supplied as a finished article of given dimensions which has been soaked in water immediately before testing for a given period of time is stretched (elongated) to rupture at a constant rate of elongation using a tensile testing apparatus that measures and records the tensile force as a functi
29、on of the elongation of the test piece. In order to determine the wet tensile strength of a tissue paper or a tissue product any one of the two following procedures of soaking in water shall be allowed, depending on the type of tensile tester used. 4.1 Test with vertical tensile testing apparatus So
30、aking in water in a Finch soaking device for 15 s and testing as described in EN 12625-4 with the minor modifications required by the use of the soaking device. 4.2 Test with horizontal tensile testing apparatus Soaking in water in a suitable vessel for 15 s and testing as described in EN 12625-4 wi
31、th the minor modifications required by the use of the soaking device. 5 Apparatus 5.1 Tensile testing apparatus, as specified in EN 12625-4. 5.1.1 Cutting device. The cutting device shall meet the requirements in accordance with EN ISO 536 and shall produce test pieces (500,5) mm wide, undamaged, st
32、raight, smooth and with parallel edges. 5.1.2 Clamps. 5.1.2.1 Clamps for vertical tensile testing apparatus using the Finch soaking device. For vertical tensile testing of a wet piece of tissue paper or a tissue product using a Finch soaking device the tensile testing apparatus shall have a clamp fo
33、r holding both ends of the test piece of 50 mm width (upper clamp). The lower clamp shall be designed to grip the soaking appliance firmly. The clamps shall have means for adjusting the clamping force. During the test the upper clamping line and the appliance rod shall be parallel to each other. The
34、y shall also be perpendicular to the direction of the applied tensile force and to the length axis of the test piece. The test span length which is defined as the distance between the clamping line and the top surface line of the cylindrical rod of the Finch soaking device shall be adjustable to1 mm
35、 (see Figures 1 and 2). The tensile testing apparatus shall have means of recording the elongation to an accuracy of 0,1 mm. Licensed Copy: sheffieldun sheffieldun, na, Sat Oct 28 09:03:33 GMT+00:00 2006, Uncontrolled Copy, (c) BSI Page 4 EN 12625-5:1999 BSI 07-1999 5.1.2.2 Clamps for horizontal ten
36、sile testing apparatus. The tensile testing apparatus shall have two clamps for holding a test piece of 50 mm width. Each clamp shall be designed to grip the test piece firmly but without damaging it along a straight line across the full width of the test piece (the clamping line) and shall have mea
37、ns of adjusting the clamping force. During the test the clamping lines shall be parallel to each other. They shall also be perpendicular to the direction of the applied tensile force and to the length axis of the test piece. The distance between the clamping lines (the test span length) shall be adj
38、ustable to1 mm. The tensile testing apparatus shall have means of recording the elongation to an accuracy of 0,1 mm. 5.2 Finch soaking device (for vertical tensile testing apparatus). The Finch soaking device (see Figures 1 and 2) consists of a support which holds a (50,1) mm diameter cylindrical ro
39、d in a horizontal position. The rod should be approximately 60 mm wide. The water container can be moved vertically and locked in a raised position. The horizontal rod may be immersed in the liquid to a depth of at least 20 mm. Projecting from the bottom of the device is a rigid metal tongue by mean
40、s of which the device can be held in the lower clamp of the tensile testing apparatus. 5.3 Soaking vessel (for horizontal tensile testing apparatus). The use of a soaking vessel which may be lowered between the clamps of the horizontal tensile testing apparatus or the use of a separate soaking vesse
41、l outside of the tensile testing apparatus shall be allowed. 6 Sampling If the test is to be done on a batch of tissue paper or tissue products sample the batch in accordance with ENV 12625-2. 7 Preparation of test pieces 7.0 General Test pieces shall be selected in accordance with ENV 12625-2. Cond
42、ition the specimens in accordance with ENV 12625-2 and keep them in the conditioning atmosphere throughout the test. If the material has been treated with a wet strength agent, ensure that the wet strength is fully developed before starting the test. To check that the wet strength is fully developed
43、 use the following procedure. Heat the sample in air at (802) 8C for 30 min and determine the wet strength before and after curing. NOTEFor production inspections where reaction times have to be very short, the operating conditions of (1052) 8C for 15 min are possible and should consequently be indi
44、cated in the test report. If the relative wet strength is required, determine the tensile strength of the same tissue paper or tissue product sample in accordance with EN 12625-4. 7.1 Dimensions Each test piece shall measure (500,5) mm in width and at least 200 mm in length, avoiding perforations an
45、d faults. It shall be of a length sufficient to clamp it in the tensile testing apparatus with a test span length of (1001) mm when using a horizontal testing apparatus. In case where a Finch soaking device in a vertical tensile testing apparatus (see Figures 1 and 2) is used the test span length ha
46、s to be 2 times (501) mm which is equal to (1002) mm, as a total span length. NOTEA higher tolerance of2 mm can be allowed when using a Finch soaking device in contrast to the horizontal testing procedure. 7.2 Number of test pieces Test at least one test piece per test sheet or specimen. The test sh
47、eet shall comprise the number of single plies typically required for its intended use. Test pieces shall be cut from every ten test sheets or specimens in the machine direction and in the cross direction. Should, in isolated cases, the requisite number of ten test sheets or specimens be unavailable,
48、 test at least ten test pieces in each direction using the available specimens. 8 Procedure 8.0 General Ensure that the tensile testing apparatus is calibrated and check the zero position of the recording device. Test at least 20 test pieces from each sample, ten in the machine direction and ten in
49、the cross direction. Determine the wet tensile strength by one of the following procedures: 8.1 Vertical tensile testing apparatus (use of a Finch soaking device) With the rod in a horizontal position, clamp the Finch soaking device with its rigid tongue projecting from the bottom of the device in the lower clamp of the tensile testing apparatus. The distance between the top edge of the rod of the Finch device and the bottom edge of the upper clamp of the tensile testing apparatus shall be (43,51) mm. In thi
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