1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS EN 12705:2011Adhesives for leather and footwear materials Determination of colour change of white or bright coloured leather surfaces by migrationBS EN 12705:2011 BRITISH STAN
2、DARDNational forewordThis British Standard is the UK implementation of EN 12705:2011. It supersedes BS EN 12705:2000, which is withdrawn.The UK participation in its preparation was entrusted to T e c h n i c a l C o m m i t t e e P R I / 5 2 , A d h e s i v e s .A list of organizations represented o
3、n this committee can 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 72241 7 ICS 83.180 Compliance with a British Standard cannot confer immunit
4、y from legal obligations.This British Standard was published under the authority of the Standards Policy and Strategy Committee on 30 June 2011.Amendments issued since publicationDate T e x t a f f e c t e dBS EN 12705:2011EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 12705 May 2011 ICS 83.18
5、0 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 chaussures - Dtermination du changement de couleur par migration des surfaces de c
6、uir 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 members are bound to comply with the CEN/CENELEC Internal Regulations which s
7、tipulate 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 application to the CEN-CENELEC Management Centre or to any CEN member. This Europe
8、an 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 Management Centre has the same status as the official versions. CEN members are
9、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, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden,
10、 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 in any form and by any means reserved worldwide for CEN national Members. Ref
11、. No. EN 12705:2011: EBS EN 12705:2011EN 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 and reference leather pieces .59 Procedure .69.1 Colour measur
12、ement 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 .69.2.4 Other storage conditions 710 Expression of results 711
13、 Test report 7BS EN 12705:2011EN 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 the status of a national standard, either by publication of an id
14、entical 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 be the subject of patent rights. CEN and/or CENELEC shall not be
15、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 does not purport to address all of the safety problems, if any, as
16、sociated 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 material permitted in this standard may have negative environmental impa
17、ct. 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 organizations of the following countries are bound to implement this Europ
18、ean 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, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and th
19、e United Kingdom. BS EN 12705:2011EN 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 constituents migrating from the reverse sides to their upper surfaces. This chang
20、e 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 references The following referenced documents are indispensable for the
21、 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 and definitions EN 1067, Adhesives Examination and preparation of sample
22、s 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 results Estimation of the mean Confidence interval CIE 15:2004, Colorimetry
23、 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 the human eye 4 Principle The bonding adhesive is coated on the reverse s
24、ide 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 the test specimen is measured after storage. BS EN 12705:2011EN 12705:20
25、11 (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 of producing a flat surface coating with a measurable uniform thickness aft
26、er 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 reference leather pieces. 5.5 Release agent, non-staining, to prevent sticki
27、ng 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 the readings to the CIE colour scale values L*, a*and b*and of calculating th
28、e 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 exposure apparatus, in accordance with EN 1244 containing a xenon arc lamp, a light
29、 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 contamination (e.g. adhesives, dust or release agents). Identify the leather as fully as
30、 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 used by name and/or designation, manufacturer, date of manufacture/supply and
31、/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 specimens and reference leather pieces Cut, using a cutting knife (5.1), from the le
32、ather 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 limits given by the adhesive manufacturer on the reverse side of one of the
33、 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 bubbles. BS EN 12705:2011EN 12705:2011 (E) 6 Allow the adhesive coat to dry, coo
34、l 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 in accordance with the instructions of its manufacture by several coats (always
35、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 2) mm x (50 2) mm and from the uncoated leather pieces, the same number of piece
36、s (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 Colour measurement of test specimens and reference leather pieces Standardise th
37、e 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 pieces by the colorimeter in accordance with CIE 15:2004. Note all values measur
38、ed 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 coloured leather surfaces caused by migration often appear accelerated under the
39、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 glass plates Measure the colour values of the test specimens and of the referenc
40、e 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 of a non-stainig release agent (5.5). Load these assemblies with a 1 000 g weight
41、 (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 and the reference leather pieces, measure their colour values as specified in 9.1
42、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 light Measure the colour values of the test specimens and of the reference leather p
43、ieces 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. BS EN 12705:2011EN 12705:2011 (E) 7 Measure at daily intervals the colour values of the test speci
44、mens 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 storage conditions Others requirements, combined or sequential storage conditions (e.g. li
45、ght 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 CIE colour scale values L*, a*and b*of each test specimen and reference leather piece
46、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 arithmetic mean in accordance with ISO 2602 of at least 5 readings. Colour differences of Eab*
47、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 identi
48、fication of the adhesive used according to Clause 7; d) mass of final total adhesive coat applied in grams, number of the adhesive coats, drying time(s), and, if used, name and/or designation of a release agent; e) description of the colorimeter used (type, manufacturer, calibration etc.), mode and
49、conditions of the colour measurement (type of illumination and observer, geometry of measurement); f) if test specimens are exposed to light description of the light exposure apparatus (type, manufacturer, lamp, filter system) and of the conditions of the exposure (intensity of irradiation, surface temperature of the specimens), rotation rate of the carousel used in the test chamber; g) test results according to Clause 10; h) any modification to the procedure described, and any incid
