DIN EN 12705-2011 Adhesives for leather and footwear materials - Determination of colour change of white or bright coloured leather surfaces by migration German version EN 12705 20.pdf

1、August 2011 Translation by DIN-Sprachendienst.English price group 7No part of this translation may be reproduced without prior permission ofDIN Deutsches Institut fr Normung e. V., Berlin. Beuth Verlag GmbH, 10772 Berlin, Germany,has the exclusive right of sale for German Standards (DIN-Normen).ICS

2、83.180!$t“1810457www.din.deDDIN EN 12705Adhesives for leather and footwear materials Determination of colour change of white or bright coloured leathersurfaces by migrationEnglish translation of DIN EN 12705:2011-08Klebstoffe fr Leder- und Schuhwerkstoffe Bestimmung der Farbnderung weier oder hellfa

3、rbiger Lederoberflchen durch MigrationEnglische bersetzung von DIN EN 12705:2011-08Adhsifs pour le cuir et les matriaux de chaussures Dtermination du changement de couleur par migration des surfaces de cuir blanc ou decouleurs clairesTraduction anglaise de DIN EN 12705:2011-08SupersedesDIN EN 12705:

4、1999-12www.beuth.deDocument comprises pagesIn case of doubt, the German-language original shall be considered authoritative.907.11 DIN EN 12705:2011-08 2 A comma is used as the decimal marker. National foreword This standard has been prepared by Technical Committee CEN/TC 193 “Adhesives” (Secretaria

5、t: AENOR, Spain). The responsible German body involved in its preparation was the Normenausschuss Materialprfung (Materials Testing Standards Committee), Working Committee NA 062-04-52 AA Schuhe. Upon completion of the test procedure, users of this standard should take care of the appropriate waste

6、disposal in accordance with the local regulations. Amendments This standard differs from DIN EN 12705:1999-12 as follows: a) an environmental statement has been included; b) normative references have been updated; c) the standard has been editorially revised. Previous editions DIN EN 12705: 1999-12

7、EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 12705 May 2011 ICS 83.180 Supersedes EN 12705:1999English Version Adhesives for leather and footwear materials - Determination of colour change of white or bright coloured leather surfaces by migration Adhsifs pour le cuir et les matriaux de chaus

8、sures - Dtermination du changement de couleur par migration des surfaces de cuir blanc ou de couleurs claires Klebstoffe fr Leder und Schuhwerkstoffe - Bestimmung der Farbnderung weier oder hellfarbiger Lederoberflchen durch Migration This European Standard was approved by CEN on 24 March 2011. CEN

9、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 standards may be obtained on appli

10、cation 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 other language made by translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Man

11、agement Centre has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Nethe

12、rlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: Avenue Marnix 17, B-1000 Brussels 2011 CEN All rights of exploitation

13、in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 12705:2011: EEN 12705:2011 (E) 2 Contents Page Foreword 31 Scope 42 Normative references 43 Terms and definitions .44 Principle 45 Apparatus and materials .56 Leather 57 Adhesive .58 Preparation of test specimens a

14、nd reference leather pieces .59 Procedure .69.1 Colour measurement of test specimens and reference leather pieces .69.2 Storage/exposure of test specimens and reference leather pieces .69.2.1 General 69.2.2 Storage 7 days at (60 2) C in the dark between glass plates 69.2.3 Exposure 7 days to light .

15、69.2.4 Other storage conditions 710 Expression of results 711 Test report 7DIN EN 12705:2011-08 EN 12705:2011 (E) 3 Foreword This document (EN 12705:2011) has been prepared by Technical Committee CEN/TC 193 “Adhesives”, the secretariat of which is held by AENOR. This European Standard shall be given

16、 the status of a national standard, either by publication of an identical text or by endorsement, at the latest by November 2011, and conflicting national standards shall be withdrawn at the latest by November 2011. Attention is drawn to the possibility that some of the elements of this document may

17、 be the subject of patent rights. CEN and/or CENELEC shall not be held responsible for identifying any or all such patent rights. This document supersedes EN 12705:1999. SAFETY STATEMENT Persons using this document should be familiar with the normal laboratory practice, if applicable. This document

18、does not purport to address all of the safety problems, if any, associated with its use. It is the responsibility of the user to establish appropriate safety and health practices and to ensure compliance with any regulatory conditions. ENVIRONMENTAL STATEMENT It is understood that some of the materi

19、al permitted in this standard may have negative environmental impact. As technological advantages lead to acceptable alternatives for these materials, they will be eliminated from this standard to the extent possible. According to the CEN/CENELEC Internal Regulations, the national standards organiza

20、tions of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portug

21、al, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. DIN EN 12705:2011-08 EN 12705:2011 (E) 4 1 Scope This European Standard specifies a method to determine the colour change of white or bright coloured leather surfaces caused by adhesives and/or their basic constituen

22、ts migrating from the reverse sides to their upper surfaces. This change of colour may be caused either by the adhesive directly or by adhesive coatings on materials used in footwear manufacture, e.g. adhesive coated linings for ironing, toe-puffs, reinforcing tapes or bonded materials. 2 Normative

23、references The following referenced 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. EN 923:2005+A1:2008, Adhesives Terms a

24、nd definitions EN 1067, Adhesives Examination and preparation of samples for testing EN 1244, Adhesives Determination of the colour and/or colour changes of adhesive coats under the influence of light EN ISO 15605, Adhesives Sampling (ISO 15605:2000) ISO 2602, Statistical interpretation of test resu

25、lts Estimation of the mean Confidence interval CIE 15:2004, Colorimetry 3 Terms and definitions For the purposes of this document, the terms and definitions given in EN 923:2005+A1:2008 and the following apply. 3.1 leather tanned animal skin, usually free of hair 3.2 colour sensation perceived by th

26、e human eye 4 Principle The bonding adhesive is coated on the reverse side of the leather under test and allowed to dry, to cool or to set for specified period of time. The colour of the upper side of the leather is measured and the test specimen is stored under specified conditions. The colour of t

27、he test specimen is measured after storage. DIN EN 12705:2011-08 EN 12705:2011 (E) 5 5 Apparatus and materials Ordinary laboratory apparatus and in particular: 5.1 Cutting knife, for cutting leather. 5.2 Coating device, to spread the adhesive to be used on the pieces of leather to be tested, capable

28、 of producing a flat surface coating with a measurable uniform thickness after drying, cooling or setting. 5.3 Analytical balance, with scale division of 0,001 g for weighing test pieces. 5.4 Glass plates, even and smooth at least 70 mm x 70 mm with a mass about 40 g for covering test specimens and

29、reference leather pieces. 5.5 Release agent, non-staining, to prevent sticking of the test specimens to the glass plates. 5.6 Weights, with a mass (1 000 10) g for loading test specimens. 5.7 Colorimeter, for measuring the colour of test specimens and reference leather pieces capable of converting t

30、he readings to the CIE colour scale values L*, a*and b*and of calculating the CIELAB colour differences L*, a*, b*and E*abautomatically in accordance with CIE 15:2004. 5.8 Oven, for storing loaded test specimens and reference leather pieces in the dark at a temperature of (60 2) C. 5.9 Light exposur

31、e apparatus, in accordance with EN 1244 containing a xenon arc lamp, a light filter, a heat filter, a temperature sensor and an irradiation-measuring device. 6 Leather The leather to be tested shall have a uniform surface of the upper side and an even, uniform reverse side free from any contaminatio

32、n (e.g. adhesives, dust or release agents). Identify the leather as fully as possible. Record type and name and/or designation of the leather, supplier, date of supply, colour, thickness and, if known, type of tanning, and the composition of a surface coat, if any. 7 Adhesive Identify the adhesive u

33、sed by name and/or designation, manufacturer, date of manufacture/supply and/or lot number, expiry date, main polymer, colour and viscosity in the test report. For two-part adhesives identify also the nature of the crosslinking agent and mixing ratio of the components. 8 Preparation of test specimen

34、s and reference leather pieces Cut, using a cutting knife (5.1), from the leather to be tested, two rectangular pieces (200 5) mm x (70 5) mm. Take a sample in accordance with EN ISO 15605 of the adhesive to be used and examine and prepare it in accordance with EN 1067. Apply the adhesive within the

35、 limits given by the adhesive manufacturer on the reverse side of one of the leather pieces cut as above indicated and spread the adhesive by a coating device (5.2) so that it covers the full area. The dry coat shall have an equal thickness, a uniform surface structure and shall not contain any bubb

36、les. DIN EN 12705:2011-08 EN 12705:2011 (E) 6 Allow the adhesive coat to dry, cool or set for the period of time specified by the adhesive manufacturer. If not specified use (30 5) min at a controlled temperature of (23 5) C and a relative humidity of less than 70 %. The adhesive used can be applied

37、 in accordance with the instructions of its manufacture by several coats (always after drying of the preceding coat) on the leather piece. Record the number of adhesive coats applied and the drying times in the test report. Cut from the coated leather piece at least three pieces (test specimens) (50

38、 2) mm x (50 2) mm and from the uncoated leather pieces, the same number of pieces (reference leather pieces) of the same dimensions. Determine the mass of dried adhesive applied by weighing the test pieces, with and without adhesive, using the analytical balance (5.3) and record it. 9 Procedure 9.1

39、 Colour measurement of test specimens and reference leather pieces Standardise the colorimeter (5.7) to a white standard (standard illuminant D 65, standard observer 10, geometry of measurement d/8), before any measurement. Determine all CIE L*, a*and b*values of test specimens and reference leather

40、 pieces by the colorimeter in accordance with CIE 15:2004. Note all values measured in the test report. 9.2 Storage/exposure of test specimens and reference leather pieces 9.2.1 General Depending on the type of leather to be tested and the adhesive used in practice colour changes of white or bright

41、coloured leather surfaces caused by migration often appear accelerated under the influence of heat and/or light. Taking into account this experience store the 3 test specimens prepared according to Clause 8 and the same number of reference pieces. 9.2.2 Storage 7 days at (60 2) C in the dark between

42、 glass plates Measure the colour values of the test specimens and of the reference leather pieces before storage as specified in 9.1 and note the colour values in the test report. Place the test specimens and the reference leather pieces between two-glass plates (5.4). If required, use a light coat

43、of a non-stainig release agent (5.5). Load these assemblies with a 1 000 g weight (5.6) and store them with the uncoated leather upper sides uppermost in an oven (5.8) controlled at (60 2) C, during 7 days. Each day take the assemblies from the oven, remove the glass plates from the test specimens a

44、nd the reference leather pieces, measure their colour values as specified in 9.1 and note them in the test report. Replace the glass plates and store them again in the oven. Repeat this procedure until a colour change of Eab* 0,5 or more appears or at least up to 7 days. 9.2.3 Exposure 7 days to lig

45、ht Measure the colour values of the test specimens and of the reference leather pieces as specified in 9.1 and note them in the test report. Mount the test specimens and the reference leather pieces in a holder of the exposure apparatus (5.9) and proceed in accordance with EN 1244. DIN EN 12705:2011

46、-08 EN 12705:2011 (E) 7 Measure at daily intervals the colour values of the test specimens and of the reference leather pieces as specified in 9.1 and note them in the test report. Continue with the exposure until a discoloration of Eab* 0,5 or more appears or at least up to 7 days. 9.2.4 Other stor

47、age conditions Others requirements, combined or sequential storage conditions (e.g. light exposure followed by storage at elevated temperature), may be chosen. Identify such conditions and record the results obtained in the test report. 10 Expression of results Express the results by indicating the

48、CIE colour scale values L*, a*and b*of each test specimen and reference leather piece both unstored/unexposed and stored/exposed and the CIE colour differences L*, a*, b*and E*abof these values calculated by a colorimeter (5.7) in accordance with CIE 15:2004. All values shall represent the arithmeti

49、c mean in accordance with ISO 2602 of at least 5 readings. Colour differences of Eab* 0,5 or less have to be ignored as they are insignificant. 11 Test report The test report shall include: a) a reference to this European Standard; b) a detailed description of the leather to be tested according to Clause 6 and of any surface treatment of the leather after the test; c) complete identification of the adhesive used according to Clause 7; d) mass of final total adhesive coat