1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS EN ISO 7263:2011Corrugating medium Determination of the flat crushresistance after laboratoryfluting (ISO 7263:2011)BS EN ISO 7263:2011 BRITISH STANDARDNational forewordThis B
2、ritish Standard is the UK implementation of EN ISO 7263:2011. It supersedes BS EN ISO 7263:2008, which is withdrawn.The UK participation in its preparation was entrusted to Technical Committee PAI/11, Methods of test for paper, board and pulps.A list of organizations represented on this committee ca
3、n be obtained on request to its secretary.This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. BSI 2011 ISBN 978 0 580 71677 5 ICS 85.060 Compliance with a British Standard cannot confer immunity from legal obliga
4、tions.This British Standard was published under the authority of the Standards Policy and Strategy Committee on 30 April 2011.Amendments issued since publicationDate T e x t a f f e c t e dEUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 7263 February 2011 ICS 85.060 Supersedes EN ISO 7263:2
5、008English Version Corrugating medium - Determination of the flat crush resistance after laboratory fluting (ISO 7263:2011) Papier cannelure pour carton ondul - Dtermination de la rsistance la compression plat aprs cannelage en laboratoire (ISO 7263:2011) Wellenrohpapier - Bestimmung des Flachstauch
6、widerstandes an labormig gewelltem Wellenpapier (ISO 7263:2011) This European Standard was approved by CEN on 14 February 2011. 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
7、 without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN member. This European Standard exists in three official versions (English, French, German). A version in any o
8、ther language made by translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management Centre has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republi
9、c, 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 Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NO
10、RMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: Avenue Marnix 17, B-1000 Brussels 2011 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN ISO 7263:2011: EBS EN ISO 7263:2011EN ISO 7263:2011 (E) 3 Foreword This document (
11、EN ISO 7263:2011) has been prepared by Technical Committee ISO/TC 6 “Paper, board and pulps“ in collaboration with Technical Committee CEN/TC 172 “Pulp, paper and board” the secretariat of which is held by DIN. This European Standard shall be given the status of a national standard, either by public
12、ation of an identical text or by endorsement, at the latest by August 2011, and conflicting national standards shall be withdrawn at the latest by August 2011. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN and/or CENELEC sha
13、ll not be held responsible for identifying any or all such patent rights. This document supersedes EN ISO 7263:2008. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bul
14、garia, Croatia, 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 the United Kingdom. Endorsement notic
15、e The text of ISO 7263:2011 has been approved by CEN as a EN ISO 7263:2011 without any modification. BS EN ISO 7263:2011ISO 7263:2011(E) ISO 2011 All rights reserved iiiContents Page Foreword iv Introduction.v 1 Scope1 2 Normative references1 3 Terms and definitions .1 4 Principle .1 5 Apparatus.2 6
16、 Sampling 4 7 Conditioning 4 8 Preparation of test pieces.4 9 Procedure.4 9.1 General .4 9.2 Testing immediately after fluting .4 9.3 Testing after 30 min of reconditioning5 9.4 Fluting and testing 5 10 Expression of results5 10.1 Flat crush resistance.5 10.2 Flat crush resistance index 6 11 Precisi
17、on 6 12 Test report6 Annex A (informative) Maintenance of fluting rolls (horizontal type)7 Bibliography8 BS EN ISO 7263:2011ISO 7263:2011(E) iv ISO 2011 All rights reservedForeword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO me
18、mber bodies). The work of preparing International Standards is normally carried out through ISO technical 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, governme
19、ntal and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with 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 Dire
20、ctives, Part 2. The main task of technical committees is to prepare International Standards. Draft International 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 bod
21、ies casting a vote. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. ISO 7263 was prepared by Technical Committee ISO/TC 6, Paper board and pulps, Sub
22、committee SC 2, Test methods and quality specifications for paper and board. This fourth edition cancels and replaces the third edition (ISO 7263:2008), of which it constitutes a minor revision. A misprint in 5.3.1 (8,55 mm) has been corrected and the calculation of the flat crush resistance index h
23、as been included in 10.2. BS EN ISO 7263:2011ISO 7263:2011(E) ISO 2011 All rights reserved vIntroduction The flat crush resistance of laboratory-fluted corrugating medium is regarded as an important property because it is an indication of the potential flat crush resistance of corrugated fibreboard
24、made from that medium. The corrugated medium is fluted by passing it between heated rollers. Two different test procedures are then widely used: a) the fluted corrugating medium is compressed immediately after fluting (i.e. 5 s to 8 s after fluting); b) the fluted corrugating medium is conditioned f
25、or 30 min to 35 min under standard laboratory test conditions before being compressed. Procedure a) generally gives considerably higher results than those obtained with procedure b). The differences in results are claimed to be caused by the lower moisture content (and thus higher stiffness) of the
26、unconditioned fluted corrugating medium, and/or the change in flute profile which occurs during the conditioning period. Since considerable advantages are claimed for both procedures and both are widely used, this International Standard describes both procedures. A method of determining the flat cru
27、sh resistance of manufactured corrugated fibreboard is given in ISO 30351. BS EN ISO 7263:2011BS EN ISO 7263:2011INTERNATIONAL STANDARD ISO 7263:2011(E) ISO 2011 All rights reserved 1Corrugating medium Determination of the flat crush resistance after laboratory fluting 1 Scope This International Sta
28、ndard specifies two methods for the determination of the flat crush resistance of a corrugating medium after laboratory fluting. The procedures are applicable to any corrugating medium intended to be used, after fluting, in the manufacture of corrugated board. 2 Normative references The following re
29、ferenced 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 IS
30、O 187, Paper, board and pulps Standard atmosphere for conditioning and testing and procedure for monitoring the atmosphere and conditioning of samples ISO 536, Paper and board Determination of grammage ISO 13820, Paper, board and corrugated fibreboard Description and calibration of compression-testi
31、ng equipment 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 flat crush resistance maximum force that a corrugated test piece will withstand before the flutes collapse under an increasing force applied perpendicular to its surface NOTE Flat c
32、rush resistance is expressed in newtons. 3.2 flat crush resistance index flat crush resistance divided by the grammage NOTE The result is expressed in newton square metres per gram (Nm2/g). 4 Principle Fluting of the corrugating medium by passing it between heated rollers, and its formation into sin
33、gle-faced corrugated board using pressure-sensitive adhesive tape as the facing. Application of a crushing force, in the direction perpendicular to the plane of the flutes, and determination of the flat crush resistance. BS EN ISO 7263:2011ISO 7263:2011(E) 2 ISO 2011 All rights reserved5 Apparatus 5
34、.1 Cutting device, for cutting the test pieces to the dimensions required. 5.2 Fluter, consisting of a pair of matched steel corrugating rolls. The roll temperature shall be maintained at 175 C 8 C. The temperature is controlled by any suitable method. Check the temperature when the rolls are in mot
35、ion. One roll is motor-driven at 4,5 r/min 1,0 r/min and the rolls are held in mesh by a force of 100 N 10 N exerted between the rolls and distributed evenly across the teeth, under test conditions. In some instruments, the force between the rolls is applied by a spring acting in a slide. In such in
36、struments, friction in this device can result in the force which acts upon the test piece being considerably less than the force required to displace the rolls initially. When verifying that an instrument conforms to the requirements given in this subclause, it is therefore necessary to measure the
37、force required to just prevent the undriven roll from moving towards the driven roll, from a position about 200 m away. The essential characteristics of each roll are the following (see also Figure 1): Roll diameter 228,5 mm 0,5 mm Roll face width 16 mm 1 mm Number of teeth 84 (see Note below) Radiu
38、s of teeth at peak 1,5 mm 0,1 mm Radius of teeth at base 2,0 mm 0,1 mm Depth of teeth 4,75 mm 0,05 mm Distance between teeth (peak-to-peak around the arc) 8,55 mm 0,05 mm In order to optimize the matching of pairs of rolls, pairs of rolls should be selected in which the differences in dimensions bet
39、ween the two are substantially less than the tolerances shown. A difference of 0,1 mm or better is recommended. Prior to first use, the rolls should be run at the operating temperature for about 6 h with a mild abrasive on the teeth. The two rolls should then be marked in some way so that, after rem
40、oval for cleaning or maintenance, they can be reassembled with exactly the same teeth in mesh. NOTE In some fluters, a full roll is not used. Dimensions in millimetres Figure 1 Profile of corrugating rolls BS EN ISO 7263:2011ISO 7263:2011(E) ISO 2011 All rights reserved 35.3 Rack and comb. 5.3.1 Rac
41、k, at least 19 mm wide with a profile corresponding to the teeth of the corrugating rolls. The rack has nine full teeth and one incomplete tooth at each end so as to form 10 valleys. The tooth spacing is 8,55 mm 0,05 mm and the height of the teeth is 4,75 mm 0,05 mm. (See 2 in Figures 2 and 3.) 5.3.
42、2 Comb, at least 19 mm wide with 10 prongs, 3,4 mm 0,1 mm high. (See 1 in Figures 2 and 3.) The rack (5.3.1) and comb may be replaced with an automatic device, provided it can be demonstrated that this device will produce the same results. Key 1 comb 2 rack Figure 2 Profile of comb and rack Dimensio
43、ns in millimetres Key 1 comb 2 rack 3 paper Figure 3 Dimensions of comb and rack BS EN ISO 7263:2011ISO 7263:2011(E) 4 ISO 2011 All rights reserved5.4 Pressure-sensitive adhesive tap, for example 3M grade 410 tape1), at least 15 mm wide. The tape shall be of low stretch and have good adhesion proper
44、ties and it shall not transfer moisture to the substrate during the test. 5.5 Flat crush tester, motor-driven, fixed-platen type in accordance with ISO 13820. 6 Sampling If the tests are being made to evaluate a lot, the sample shall be selected in accordance with ISO 186. If the tests are made on a
45、nother type of sample, make sure that the specimens taken are representative of the sample received. 7 Conditioning When using the reconditioning procedure (see 9.3), before preparation of the test pieces, condition the sample for at least 4 h in one of the conditioning atmospheres specified in ISO
46、187. 8 Preparation of test pieces If the flat crush resistance index is required, determine the grammage of the conditioned specimens (before the preparation of test pieces) as described in ISO 536. Cut at least 10 test pieces having a width of 12,7 mm 0,1 mm and a length between 150 mm and 160 mm,
47、the length being cut in the machine direction. Care should be taken not to damage the edges of the test pieces and they should not be handled more than is necessary. A test piece width of 15,0 mm 0,1 mm may be used, provided that the corrugating roll width is greater than the test piece width. If a
48、test width of 15 mm is used, the force between the corrugating rolls, as defined in 5.2, is to be adjusted to 118 N 10 N. The use of a 15 mm test piece width is not to be considered as being in accordance with this International Standard and its use is to be stated in the test report. 9 Procedure 9.
49、1 General The compression test may be carried out immediately after fluting (see 9.2) or after reconditioning (see 9.3). 9.2 Testing immediately after fluting If the test is to be carried out immediately after fluting, the total time between discharge of the fluted test piece from the fluting rolls and the initial application of the crushing force shall be 5 s to 8 s. Arrange all equipment to facilitate completing the operations in the specified time. For the most reliable results, the tim
