1、BSI Standards PublicationBS ISO 12632:2015Graphic technology Ink, paper and labels Requirements on hot alkalipenetration and resistanceBS ISO 12632:2015 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of ISO 12632:2015.The UK participation in its preparation was entru
2、sted to TechnicalCommittee PAI/43, Graphic technology.A list of organizations represented on this committee can beobtained on request to its secretary.This publication does not purport to include all the necessaryprovisions of a contract. Users are responsible for its correctapplication. The British
3、 Standards Institution 2015. Published by BSI StandardsLimited 2015ISBN 978 0 580 87089 7ICS 87.080Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was published under the authority of theStandards Policy and Strategy Committee on 31 December 2015
4、.Amendments issued since publicationDate Text affectedBS ISO 12632:2015 ISO 2015Graphic technology Ink, paper and labels Requirements on hot alkali penetration and resistanceTechnologie graphique Encres, papier et tiquettes Exigences de pntrabilit et rsistance aux alcalins chaudsINTERNATIONAL STANDA
5、RDISO12632First edition2015-12-15Reference numberISO 12632:2015(E)BS ISO 12632:2015ISO 12632:2015(E)ii ISO 2015 All rights reservedCOPYRIGHT PROTECTED DOCUMENT ISO 2015, Published in SwitzerlandAll rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized
6、 otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below or ISOs member body in the country of the requester.ISO copyright of
7、ficeCh. de Blandonnet 8 CP 401CH-1214 Vernier, Geneva, SwitzerlandTel. +41 22 749 01 11Fax +41 22 749 09 47copyrightiso.orgwww.iso.orgBS ISO 12632:2015ISO 12632:2015(E)Foreword ivIntroduction v1 Scope . 12 Terms and definitions . 13 Principle 13.1 Test method for the penetration time of hot alkaline
8、 solution on labels . 13.2 Test method for the removal time of labels by hot alkaline solution . 23.3 Test method for the resistance of labels against hot alkaline solution . 24 Apparatus and reagents 24.1 Apparatus 24.2 Reagents 24.3 Preparation of the thymolphthaleine containing glue 35 Specimens
9、35.1 Penetration and removal time . 35.2 Resistance against hot alkaline solution . 36 Test procedure 36.1 Penetrability time of hot sodium hydroxide solution through labels 36.2 Removal time of labels . 46.3 Resistance against hot alkaline solution . 47 Test report . 4 ISO 2015 All rights reserved
10、iiiContents PageBS ISO 12632:2015ISO 12632:2015(E)ForewordISO (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 committees. Each
11、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 the International
12、 Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.The procedures used to develop this document and those intended for its further maintenance are described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the different ty
13、pes of ISO documents should be noted. This document was drafted in accordance with the editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives). Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO shall not b
14、e held responsible for identifying any or all such patent rights. Details of any patent rights identified during the development of the document will be in the Introduction and/or on the ISO list of patent declarations received (see www.iso.org/patents). Any trade name used in this document is infor
15、mation given for the convenience of users and does not constitute an endorsement.For an explanation on the meaning of ISO specific terms and expressions related to conformity assessment, as well as information about ISOs adherence to the WTO principles in the Technical Barriers to Trade (TBT) see th
16、e following URL: Foreword - Supplementary informationThe committee responsible for this document is ISO/TC 130, Graphic technology.iv ISO 2015 All rights reservedBS ISO 12632:2015ISO 12632:2015(E)IntroductionBottles or other containers for beverages and soft drinks may be labeled with wet glued prin
17、ted labels of various substrates. If the bottles and containers are reused, they need to be cleaned thoroughly. Often, bottles and containers are used for different types of drinks. This requires the removal of the labels from the bottles and containers during the cleaning process. Usually, hot alka
18、line solution is used within the cleaning facilities. To ensure the stability of the process, the penetration of the cleaning solution through the label needs to occur rapidly. In addition, the labels need to stay intact to ease the process of removing them from the cleaning agent. Also, no dying of
19、 the solution must occur so as to minimize costs for the waste treatment of the cleaning solutions after neutralization. The test methods given in this International Standard have been successfully applied in the European beverage industry for decades and are also standardized as DIN Standards. ISO
20、2015 All rights reserved vBS ISO 12632:2015BS ISO 12632:2015Graphic technology Ink, paper and labels Requirements on hot alkali penetration and resistance1 ScopeThis International Standard specifies test methods for penetrability and removal times of labels that have been wet glued on bottles intend
21、ed to be refilled and reused, and resistance of printed labels against hot alkaline solution.Test results always deal with systems comprising of substrates, ink films and varnish films if present. This International Standard is valid for label substrates and printed labels. Label substrates include
22、metalized papers. The test procedures are also valid for the evaluation of inks and papers to be used in printing labels.This International Standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this International Sta
23、ndard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.2 Terms and definitionsFor the purposes of this document, the following terms and definitions apply.2.1penetration timetime of travel for a liquid through a substrate2.2r
24、emoval timetime of separation of a glued label from a glass substrate2.3thymolphthaleineorganic chemical compound that is employed as an acid-base indicator, changing in appearance from red to yellow to blue as the pH changes from acidic (low pH) to neutral (pH = 7) to basic (high pH)2.4wire barcoat
25、ing device consisting of a metal rod covered with a tightly wound wire, in which the applied coating thickness is a function of the diameter of the wire (also known as a wire-wound rod)3 PrincipleLabels of bottles intended to be refilled and reused are removed from the bottles by applying hot alkali
26、ne solution.3.1 Test method for the penetration time of hot alkaline solution on labelsTo test if the hot alkaline solution is able to penetrate printed labels or label substrates from bottles within a required time, a glue, containing thymolphthalein solution is applied on the glue side of the labe
27、l, the label is then glued onto the bottom of a petri dish and the dish is brought into contact with the hot alkaline solution. Appearance of a blue colour indicates the penetration of the hot alkaline solution INTERNATIONAL STANDARD ISO 12632:2015(E) ISO 2015 All rights reserved 1BS ISO 12632:2015I
28、SO 12632:2015(E)through the label. The experimenter records the time elapsed between adding the alkaline solution and the appearance of the blue colour.3.2 Test method for the removal time of labels by hot alkaline solutionTo test the time required to remove glued labels or label substrates from bot
29、tles, the test of 3.1 is continued until the labels are separated from the petri dish.3.3 Test method for the resistance of labels against hot alkaline solutionTo test the resistance of labels against hot alkaline solution, a specified area of printed labels will be placed in contact with a specifie
30、d solution of NaOH at a defined temperature and for a specified period of time. The evaluation includes inspection of the surface of the labels layer separation (ink and paper), colour changes and the colour of the solution. To evaluate the usability of inks, either test prints on label stock or pri
31、nted labels shall be used. The ink film thickness of test prints shall be comparable to that of printed labels.4 Apparatus and reagents4.1 Apparatus4.1.1 Beaker, diameter 140 mm, volume about 2 l.4.1.2 Drying cabinet.4.1.3 Filter hopper.4.1.4 Glass plates, 2, 60 mm 90 mm 2 mm.4.1.5 Hot plate, equipp
32、ed with thermostat and magnetic stirrer.4.1.6 Beaker insert for the beaker, to avoid direct contact between labels and the magnetic stirrer.4.1.7 Laboratory filter paper, for qualitative chemical analysis, white, neutral.4.1.8 Laboratory funnel.4.1.9 Petri dish, 90 mm to 100 mm in diameter.4.1.10 Sa
33、fety glasses and protective gloves.4.1.11 Stopwatch.4.1.12 Tweezers.4.1.13 Wire bar, capable of applying wet films of a thickness of 50 m.4.2 Reagents4.2.1 1 % sodium hydroxide solution (by mass), for testing the penetrability and the removal time of labels, prepared from demineralized water. This s
34、olution may be used for up to 20 tests.2 ISO 2015 All rights reservedBS ISO 12632:2015ISO 12632:2015(E)4.2.2 2,5 % sodium hydroxide solution (by mass), for testing the resistance of labels against hot alkaline solution, prepared from demineralized water. This solution shall contain commercial additi
35、ves used in industrial bottle cleaning facilities in typical concentrations (e.g. 0,2 %).4.2.3 Thymolphthaleine, ground into powder form.4.2.4 Ethanol.4.2.5 pH-neutral casein glue.4.2.6 Demineralized water.4.3 Preparation of the thymolphthaleine containing glueTwo spatula tips of thymolphthaleine ar
36、e dissolved in 50 ml ethanol and filtered. Five parts of this solution are mixed with 95 parts of pH-neutral caseine glue. Both the thymolphthaleine solution and the thymolphthaleine containing glue should not be older than one week. The pH neutral caseine glue should not be older than one year.5 Sp
37、ecimensInks shall be completely dried/cured, e.g. oxidative drying inks should be stored for 48 h prior to testing.5.1 Penetration and removal timeAt least three samples shall be tested. Circular specimens with a preferred diameter of 80 mm are cut out of larger sheets. Smaller die-cut labels may be
38、 used.5.2 Resistance against hot alkaline solutionMultiple specimens shall be tested. They shall have an area of (500 50) cm.6 Test procedureHot alkaline solution might cause severe etching of the human skin. Hot alkaline solution may irreversibly damage the eye if droplets are spilled into the eye.
39、 Safety glasses and protective gloves shall be used.6.1 Penetrability time of hot sodium hydroxide solution through labelsThe glue is coated onto a glass plate using the wire bar. The size of the coated area shall be larger in all dimensions than the label specimen to be tested. The specimen is plac
40、ed onto the coated area by means of tweezers and uniformly pressed onto the glass plate by a rubber roller. The label is removed from the glass plate using tweezers at an angle of 90. The label is glued onto the outer bottom of the petri dish without bubbles and dried for 24 h at room temperature.Th
41、e petri dish with the specimen facing downwards is submerged into 1 000 ml hot 1 % sodium hydroxide solution in the beaker and placed on the beaker insert. The temperature of the sodium hydroxide solution shall be (75 2) C if labels for glass bottles are to be tested and shall be adapted to the real
42、 temperature of the cleaning equipment if labels for plastic bottles are to be tested. The hot sodium hydroxide solution shall be stirred magnetically with (250 50) revolutions per minute. The time needed for the penetration of the sodium hydroxide solution through the label is measured. The endpoin
43、t is reached if three quarters of the specimen area have turned blue. ISO 2015 All rights reserved 3BS ISO 12632:2015ISO 12632:2015(E)6.2 Removal time of labelsThe test is performed according to 6.1. The time is measured from the start of the test until the label separates from the petri dish.6.3 Re
44、sistance against hot alkaline solutionPlace 1 000 ml 2,5 % sodium hydroxide solution in the beaker together with the beaker insert and a magnetic stirring bar. The solution is stirred by a magnetic stirrer at a speed of (250 50) revolutions per minute and heated to 85 C. Specimens are placed into th
45、e label insert and held for a period of 20 min. Multiple specimens shall be placed into the solution one by one using tweezers. The specimens are removed from the solution one by one after shaking individually in order to separate labels and to ensure the surface of the label is in contact with the
46、alkaline solution. The specimens are dried on laboratory filter paper. The alkaline solution is filtered using laboratory filter paper and a laboratory funnel.NOTE 1 The filtered alkaline solution may be used for the determination of the chemical oxygen demand (COD) and/or the absorbable organic hal
47、ogenated compounds (AOX). The amount of the filter residue may be weighed and expressed in g per 500 cm.Resistance against hot alkaline solution requires integrity of the substrate (no physical separation of the substrate fibers), integrity of the printed image (discolouration is possible for non-al
48、kali resistant inks) (samples on metalized substrates may show larger ink removal), and no colouration of the alkaline solution (after filtration).NOTE 2 There can be very fine solid ink particles present, erroneously simulating a coloration of the solution, which might not be able to be filtered of
49、f. This can be identified by leaving the solution for a long time without agitation. Alternatively, the solution might be centrifuged.7 Test reportThe test report shall include the following information: a reference to this International Standard, i.e. ISO 12632:2015; identification of the material tested (print process, substrate, ink, finishing, size, etc.); deviation from this procedure.In addition for tests according to 6.1 and 6.2: glue used; penetration time; removal time.In addition for tests according to
