1、BS EN ISO 8254-2:2016Paper and board Measurement of specular glossPart 2: 75 degree gloss with a parallelbeam, DIN method (ISO 8254-2:2016)BSI Standards PublicationWB11885_BSI_StandardCovs_2013_AW.indd 1 15/05/2013 15:06BS EN ISO 8254-2:2016 BRITISH STANDARDNational forewordThis British Standard is
2、the UK implementation of EN ISO8254-2:2016. It supersedes BS EN ISO 8254-2:2003 which iswithdrawn.The UK participation in its preparation was entrusted to TechnicalCommittee PAI/11, Methods of test for paper, board and pulps.A list of organizations represented on this committee can beobtained on req
3、uest to its secretary.This publication does not purport to include all the necessaryprovisions of a contract. Users are responsible for its correctapplication. The British Standards Institution 2016. Published by BSI StandardsLimited 2016ISBN 978 0 580 86890 0ICS 85.060Compliance with a British Stan
4、dard cannot confer immunity fromlegal obligations.This British Standard was published under the authority of theStandards Policy and Strategy Committee on 31 August 2016.Amendments issued since publicationDate Text affectedEUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 8254-2 July 2016 ICS
5、 85.060 Supersedes EN ISO 8254-2:2003English Version Paper and board - Measurement of specular gloss - Part 2: 75 degree gloss with a parallel beam, DIN method (ISO 8254-2:2016) Papiers et cartons - Mesurage du brillant spculaire - Partie 2: Brillant 75 degrs avec un faisceau parallle, mthode DIN (I
6、SO 8254-2:2016) Papier und Pappe - Bestimmung des Glanzes - Teil 2: Messung mit einem parallelen Strahl bei 75, DIN-Verfahren (ISO 8254-2:2016) This European Standard was approved by CEN on 19 May 2016. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the con
7、ditions 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 European Standard exis
8、ts 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 the national sta
9、ndards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, S
10、lovenia, Spain, Sweden, Switzerland, Turkey andUnited Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels 2016 CEN All rights of exploitation in any form and by any means reserv
11、ed worldwide for CEN national Members. Ref. No. EN ISO 8254-2:2016 EBS EN ISO 8254-2:2016EN ISO 8254-2:2016 (E) 3 European foreword This document (EN ISO 8254-2:2016) has been prepared by Technical Committee ISO/TC 6 “Paper, board and pulps” in collaboration with Technical Committee CEN/TC 172 “Pulp
12、, 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 publication of an identical text or by endorsement, at the latest by January 2017, and conflicting national standards shall be withdrawn at the latest by Jan
13、uary 2017. 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 held responsible for identifying any or all such patent rights. This document supersedes EN ISO 8254-2:2003. According to the CEN-CENELEC I
14、nternal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland
15、, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. Endorsement notice The text of ISO 8254-2:2016 has been approved by CEN as EN ISO 8254-2:2016 without any modificatio
16、n. BS EN ISO 8254-2:2016ISO 8254-2:2016(E)Foreword ivIntroduction v1 Scope . 12 Normative references 13 Terms and definitions . 14 Principle 25 Equipment . 25.1 Reflectometer . 25.2 Gloss standards . 25.2.1 Zero-gloss standards 25.2.2 Primary gloss standards 25.2.3 Working standards . 35.2.4 Interme
17、diate gloss standards . 36 Sampling 47 Preparation of test pieces . 47.1 Conditioning 47.2 Preparation 48 Procedure. 48.1 Calibration 48.2 Determination of reflectometer value 58.3 Calculation and expression of results 59 Test report . 5Annex A (normative) Description of the instrument. 6Annex B (in
18、formative) Nominated organizations for calibration of intermediate gloss standards 10Bibliography .11 ISO 2016 All rights reserved iiiContents PageBS EN ISO 8254-2:2016ISO 8254-2:2016(E)ForewordISO (the International Organization for Standardization) is a worldwide federation of national standards b
19、odies (ISO member 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 organizati
20、ons, governmental 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.The procedures used to develop this document and those intended for its furthe
21、r maintenance are described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the different types 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
22、).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. Details of any patent rights identified during the development of the document will be in the Intro
23、duction and/or on the ISO list of patent declarations received (see www.iso.org/patents).Any trade name used in this document is information 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 co
24、nformity assessment, as well as information about ISOs adherence to the WTO principles in the Technical Barriers to Trade (TBT) see the following URL: Foreword - Supplementary informationThe committee responsible for this document is ISO/TC 6, Paper, board and pulps.This second edition cancels and r
25、eplaces the first edition (ISO 8254-2:2003), which has been editorially revised (minor revision) to update the bibliographic references.ISO 8254 consists of the following parts, under the general title Paper and board Measurement of specular gloss: Part 1: 75 gloss with a converging beam, TAPPI meth
26、od Part 2: 75 gloss with a parallel beam, DIN method Part 3: 20 gloss with a converging beam, TAPPI methodAnnex A forms a normative part of this part of ISO 8254. Annex B is for information only.iv ISO 2016 All rights reservedBS EN ISO 8254-2:2016ISO 8254-2:2016(E)IntroductionVisual gloss is a senso
27、ry impression which cannot yet be described completely. Some important physical variables which influence gloss are however known. The sensory perception of gloss under a suitable illumination results from a physical stimulus due to reflection of light from a surface. This reflection is defined by a
28、n indicatrix which changes with the angle of incidence. The maximum indicatrix value which is decisive for visual gloss impression is associated with specular reflection, at an angle of reflection which is approximately equal to the angle of incidence. The reflectometer value is determined by averag
29、ing the reflection in a defined angular region centred in the specular direction.NOTE 1 A reflectometer value is a measure of the visual gloss only when the optical conditions of measurement, such as angles and apertures of illumination and observation, are similar to the conditions of viewing.NOTE
30、2 Because luminance and structure enter to some extent into the reflectometer value of the test piece, only the comparison of test pieces with nearly the same luminance and structure is meaningful. The influence of luminance on the measurement result decreases rapidly with increasing reflectometer v
31、alue and increasing angle of reflection.The proportion of specular reflection in the entire reflection increases with increasing angle of incidence. Very matt surfaces generate a noticeable degree of specular reflection and, therefore, a noticeable gloss effect only above a certain minimum angle of
32、incidence. On the other hand, a large angle of incidence reduces the ability to differentiate between surfaces of high gloss.NOTE 3 Manufacturers of coated papers usually divide their products into two classes according to their surface gloss: matt coating and gloss coating. However, these classes a
33、re only defined approximately. The matt class has reflectometer values, measured according to this part of ISO 8254, from 0 to approximately 20. The glossy class has reflectometer values higher than this value. As there is no precise correlation between reflectometer values measured with different g
34、eometries, it is advisable to compare the reflectometer values only within a single class of papers and using the same measuring geometry.This part of ISO 8254 describes measurement at an angle of incidence of 75 using a parallel beam geometry commonly known as the 75 DIN method. Precision data are
35、not available at the time of publication.NOTE 4 EN 14086 describes measurement at an angle of 45. ISO 2016 All rights reserved vBS EN ISO 8254-2:2016BS EN ISO 8254-2:2016Paper and board Measurement of specular gloss Part 2: 75 gloss with a parallel beam, DIN method1 ScopeThis part of ISO 8254 specif
36、ies a photometric test method for the assessment of visual gloss by means of a reflectometer value measured at an angle of 75. It is applicable to plane paper and board surfaces of gloss levels below 65, measured according to this part of ISO 8254. It should be the preferred method for paper and boa
37、rd surfaces of gloss levels below 20, measured according to this part of ISO 8254. Materials containing optical brightening agents may be measured.2 Normative referencesThe following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application
38、. 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 qualityISO 187, Paper, board and pulps Standard atmosphere for conditioning and test
39、ing and procedure for monitoring the atmosphere and conditioning of samplesISO 10110-5, Optics and photonics Preparation of drawings for optical elements and systems Part 5: Surface form tolerancesCIE 038-1977, Radiometric and photometric characteristics of materials and their measurement3 Terms and
40、 definitionsFor the purposes of this document, the following terms and definitions apply.3.1indicatrixangular distribution of the reflected light which is measured as illuminance (lm m2) on the receptor3.2reflectometerinstrument for measuring quantities pertaining to reflection3.3reflectometer value
41、measured value which, for a given angle of incidence, is proportional to the integral of the reflection indicatrix within the solid angle defined by the apertures (see A.2.1) and is equal to 100 times the ratio of the value obtained for the sample to that of a defined specularly reflecting surface (
42、5.2.2)3.4specular glossreflectometer value as defined in 3.3Note 1 to entry: The defined specularly reflecting surface thus has an assigned reflectometer value of 100. Reflectometer values are therefore not percentages.INTERNATIONAL STANDARD ISO 8254-2:2016(E) ISO 2016 All rights reserved 1BS EN ISO
43、 8254-2:2016ISO 8254-2:2016(E)4 PrincipleThe sample is illuminated with a collimated beam at an angle of 75 to the normal, and the reflectometer value is measured within a solid angle defined by a given aperture at an angle of reflection equal to the angle of incidence. The scale of the reflectomete
44、r is calibrated with reference to the reflection from a black glass plate or a quartz wedge with a specific refractive index.5 Equipment5.1 ReflectometerThe reflectometer shall consist of the following principal components: a collimator, a decollimator, an electric supply for the light source device
45、, a photoelectronic receptor and a sample holder, as described in Annex A.5.2 Gloss standardsThe reflectometer is calibrated by means of a zero-gloss standard and a high gloss standard with a reflectometer value between about 80 and 100. This high gloss standard can be either a primary gloss standar
46、d or a working gloss standard.Intermediate gloss standards with assigned reflectometer values are used to check the adjustment of the device.As reflectometer values of gloss standards may change due to environmental influences, they should be checked at least once per year.5.2.1 Zero-gloss standards
47、A zero-gloss standard is a gloss standard which, in the ideal case, absorbs all light falling on it. A black cavity lined with black velvet or felt is one realization of such a gloss standard that has been proven in practice.5.2.2 Primary gloss standardsA primary gloss standard is a gloss standard w
48、hose reflectometer value can be calculated by means of its refractive index using the Fresnel equation. The reflectometer value is defined as being equal to 100 for a black glass plate or a fused quartz wedge with a nominal refractive index of n = 1,567 at a wavelength of 587,6 nm (He-d- line). A bl
49、ack glass plate or quartz wedge with a refractive index at a wavelength of 587,6 nm (see ISO 7944) known to three decimal places can be used as primary gloss standard. The top surface of the glass plate or quartz wedge shall be plane to within 2 fringes per centimetre as measured by an optical interference method in a wavelength region of (600 100) nm 2 ISO 2016 All rights reservedBS EN ISO 8254-2:2016ISO 8254-2:2016(E)according to ISO 10110-5. If the refractive index n differs from 1,567, the reflectometer value R shall be cal
