1、BRITISH STANDARDBS EN ISO 5350-1:2006Pulps Estimation of dirt and shives Part 1: Inspection of laboratory sheets by transmitted lightThe European Standard EN ISO 5350-1:2006 has the status of a British StandardICS 85.040g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44
2、g54g54g44g50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58BS EN ISO 5350-1:2006This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 October 2006 BSI 2006ISBN 0 580 49329 6National fo
3、rewordThis British Standard was published by BSI. It is the UK implementation of EN ISO 5350-1:2006. It supersedes BS EN ISO 5350-1:1998 which is withdrawn.The UK participation in its preparation was entrusted to Technical Committee PAI/11, Methods of test for paper, board and pulps.A list of organi
4、zations represented on PAI/11 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.Compliance with a British Standard cannot confer immunity from legal obligations.Amendm
5、ents issued since publicationAmd. No. Date CommentsEUROPEAN STANDARDNORME EUROPENNEEUROPISCHE NORMEN ISO 5350-1August 2006ICS 85.040 Supersedes EN ISO 5350-1:1998 English VersionPulps - Estimation of dirt and shives - Part 1: Inspection oflaboratory sheets by transmitted light (ISO 5350-1:2006)Ptes
6、- Estimation des impurets et bchettes - Partie 1:Examen des feuilles de laboratoire par lumire transmise(ISO 5350-1:2006)Faserstoff - Bewertung von Schmutz und Splittern - Teil 1:Prfung von Laborblttern mit dem Durchlicht-Verfahren(ISO 5350-1:2006)This European Standard was approved by CEN on 14 Aug
7、ust 2006.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards may be obtain
8、ed on application to the Central Secretariat or to any CEN member.This European Standard exists in three official versions (English, French, German). A version in any other language made by translationunder the responsibility of a CEN member into its own language and notified to the Central Secretar
9、iat has the same status as the officialversions.CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France,Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,
10、 Romania,Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMIT EUROPEN DE NORMALISATIONEUROPISCHES KOMITEE FR NORMUNGManagement Centre: rue de Stassart, 36 B-1050 Brussels 2006 CEN All rights of exploitation in any form and by any means reserve
11、dworldwide for CEN national Members.Ref. No. EN ISO 5350-1:2006: EForeword This document (EN ISO 5350-1:2006) 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 D
12、IN. 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 February 2007, and conflicting national standards shall be withdrawn at the latest by February 2007. This document supersedes EN ISO 5350-1:1998
13、. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
14、Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. Endorsement notice The text of ISO 5350-1:2006 has been approved by CEN as EN ISO 5350-1:2006 without any modifications. EN ISO 5350-1:2006Reference number
15、ISO 5350-1:2006(E)INTERNATIONAL STANDARD ISO5350-1Third edition2006-08-15Pulps Estimation of dirt and shives Part 1: Inspection of laboratory sheets by transmitted light Ptes Estimation des impurets et bchettes Partie 1: Examen des feuilles de laboratoire par lumire transmise EN ISO 5350-1:2006ii ii
16、iContents Page Foreword iv Introduction v 1 Scope . 1 2 Normative references . 1 3 Terms and definitions. 1 4 Principle. 2 5 Apparatus 2 6 Sampling and preparation of test pieces . 3 6.1 Sampling 3 6.2 Pretreatment of the sample . 3 6.3 Preparation of laboratory sheets 4 7 Procedure 4 7.1 Determinat
17、ion of dry matter content. 4 7.2 Examination. 4 7.3 Classification of contraries 4 8 Expression of results . 5 8.1 Calculation. 5 8.2 Results . 5 8.3 Precision 5 9 Test report . 7 Annex A (normative) Comparison chart 8 Annex B (informative) Instrumental procedure. 10 Bibliography . 12 EN ISO 5350-1:
18、2006iv Foreword ISO (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 member body interested in a subject for wh
19、ich 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 Electrotechnical Commission (IEC) on all
20、matters of electrotechnical standardization. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2. The main task of technical committees is to prepare International Standards. Draft International Standards adopted by the technical committees are ci
21、rculated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies 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 respo
22、nsible for identifying any or all such patent rights. ISO 5350-1 was prepared by Technical Committee ISO/TC 6, Paper, board and pulps, Subcommittee SC 5, Test methods and quality specifications for pulps. This third edition cancels and replaces the second edition (ISO 5350-1:1998, ISO 5350-1:1998/Co
23、r.1:1999), which has been technically revised. With regard to ISO 5350-1:1998 and Technical Corrigendum 1:1999, the following changes have been made: a) the normative references have been updated; b) a more precise description of the sampling and preparation of test pieces was given; c) precision da
24、ta have been moved from informative Annex B to 8.3; d) the status of the annex for the instrumental procedure has been changed from normative to informative and a more precise description of the instrumental procedure was given; e) editorial updating. ISO 5350 consists of the following parts, under
25、the general title Pulps Estimation of dirt and shives: Part 1: Inspection of laboratory sheets by transmitted light Part 2: Inspection of mill sheeted pulp by transmitted light Part 3: Visual inspection by reflected light using Equivalent Black Area (EBA) method Part 4: Instrumental inspection by re
26、flected light using Equivalent Black Area (EBA) method EN ISO 5350-1:2006vIntroduction This part of ISO 5350 is based upon visual inspection. Informative Annex B is used when the inspection is performed by instrumental devices. For the time being, though, visual inspection provides the basis for thi
27、s part of ISO 5350. This will eventually be changed when more experience with instrumental devices is gained, and it has been shown that such equipment can estimate dirt and shives to an acceptable level of precision at least equal to visual inspection. This part of ISO 5350 is complementary to ISO
28、5350-2, which concerns visual inspection of mill sheeted pulp by transmitted light, and ISO 5350-3, which concerns visual inspection by reflected light. ISO 5350-4 is based on automatic inspection by reflected light. EN ISO 5350-1:2006blank1Pulps Estimation of dirt and shives Part 1: Inspection of l
29、aboratory sheets by transmitted light 1 Scope This part of ISO 5350 specifies a method for the estimation by transmitted light of the visible dirt and shives in laboratory sheets prepared from pulp. It is, in principle, applicable to all kinds of pulp, although it is mainly intended for pulp that is
30、 not manufactured in sheet form. This part of ISO 5350 can also be applied to mill sheeted pulp, if the sheets have high grammage or are very opaque for other reasons, in which case ISO 5350-2 is not applicable. This part of ISO 5350 is not intended for recycled pulp. NOTE Shives in mechanical pulp
31、are usually determined by means based on screening or optical analyses. Some grades of mechanical pulps can cause problems in sheet-making or inspection, which makes this part of ISO 5350 impractical. 2 Normative references The following referenced documents are indispensable for the application of
32、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 638, Pulps Determination of dry matter content ISO 5263-1, Pulps Laboratory wet disintegration Part 1: Disintegration of
33、chemical pulps ISO 5263-2, Pulps Laboratory wet disintegration Part 2: Disintegration of mechanical pulps at 20 C ISO 5263-3, Pulps Laboratory wet disintegration Part 3: Disintegration of mechanical pulps at W 85 C ISO 5269-1, Pulps Preparation of laboratory sheets for physical testing Part 1: Conve
34、ntional sheet-former method ISO 5269-2, Pulps Preparation of laboratory sheets for physical testing Part 2: Rapid-Kthen method ISO 7213, Pulps Sampling for testing 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. EN ISO 5350-1:20062 3.1 sheet a sh
35、eet of pulp taken from a bale, or a part of a roll of pulp 3.2 laboratory sheet a sheet formed from disintegrated pulp 3.3 test piece a laboratory sheet taken for inspection 3.4 contrary in pulp any unwanted particle, of specified minimum size and having a contrasting colour or opacity with respect
36、to the surrounding area of the sheet, according to the comparison chart given in Annex A 3.4.1 dirt any non-fibrous contrary 3.4.2 shive sliver of wood, or fibre bundle 4 Principle Test pieces, formed from disintegrated pulp, are inspected in transmitted light. The area of all contraries larger than
37、 a specified value and showing contrasting opacity, with respect to the surrounding area of the sheet, according to the comparison chart given in Annex A, are estimated. The estimated areas of the contraries are added, and the total area of dirt and shives is reported as square millimetres per kilog
38、ram of oven-dry pulp (mm2/kg). NOTE If required, the areas of dirt and shives in different classes can also be reported. 5 Apparatus 5.1 Viewing table, with an illumination device suitable for inspecting the test pieces in transmitted artificial daylight. The luminance, as measured at the surface of
39、 the viewing table, shall be 2 500 cd/m2to 3 000 cd/m2. Daylight or direct light from any external source should be avoided. NOTE The luminance can be measured by a luminance meter. 5.2 Comparison chart: a transparent film with a series of black and grey spots of different shapes, areas and contrast
40、s. This shall be used for visual inspection or for calibration of an instrumental device. The chart is provided in normative Annex A. Do not use a photocopy of the chart in any inspection, because reproduction may change the size and contrast of the spots. EN ISO 5350-1:200635.3 Apparatus to prepare
41、 laboratory sheets 5.3.1 General Care shall be taken to avoid contamination of the pulp during the test. It is necessary to ensure that the surface and elements of the disintegrator and sheet-making equipment are clean and free from corrosion and deposits. Make sure that the water to be used is free
42、 from foreign particles; if necessary, filter the water. 5.3.2 Disintegrator, as specified in ISO 5263-1, ISO 5263-2 or ISO 5263-3. 5.3.3 Sheet-former equipment, as specified in ISO 5269-1 or ISO 5269-2. 5.3.4 Blotters, of a size corresponding to the sheet-former equipment. 6 Sampling and preparatio
43、n of test pieces 6.1 Sampling If the test is being made to evaluate a pulp lot, the sample shall be selected in accordance with ISO 7213. If the test is made on another type of sample, report the source of the sample and, if possible, the sampling procedure used. From the sample received, make sure
44、that the test portions taken are representative of the whole sample. The total oven-dry mass of test pieces shall be at least 180 g. 100 g of test pieces are required for the inspection, but 180 g provides the possibility to make a preliminary test as described in 6.2. 6.2 Pretreatment of the sample
45、 The sample should be soaked in water and disintegrated in accordance with the procedure stated in ISO 5263-1, ISO 5263-2 or ISO 5263-3. Choose the number of revolutions so that extensive disintegration is avoided, but all lumps of fibers have disappeared. It is advisable to make some preliminary te
46、sts to establish the number of revolutions needed. Table 1 gives an indication of the number of revolutions found appropriate for some grades of dry pulp. Table 1 Recommended values for the number of revolutions, the grammage (as oven-dry) and minimum number of laboratory sheets Minimum number of sh
47、eets Pulp quality Number of revolutions Maximum grammage g/m2Square conventional sheet-former Round conventional sheet-former Rapid-Kthen sheet-former Flash-dried bleached chemical pulp 10 000 700 6 7 5 Mechanical pulp, dry 6 000 a150 25 32 22 Unbleached, kraft pulp, dry 8 000 80 47 59 40 aFor some
48、grades, as many as 12 000 revolutions are needed for complete disintegration.It is very time consuming to examine pulp with a very high dirt count, so if it is found by a preliminary test that the number of contraries exceeds 300 per kilogram of oven-dry pulp, the amount to be inspected can be reduc
49、ed to 50 g of oven-dry pulp. This shall be reported with the results. EN ISO 5350-1:20064 6.3 Preparation of laboratory sheets Prepare a number of laboratory sheets in the sheet-former apparatus. The number of laboratory sheets and their grammage shall correspond to at least 100 g of oven-dry pulp. Table 1 gives the recommended grammages and the minimum number of test pieces to be inspected for some pulp qualities. Mark the topsides of the test pieces. Press the laboratory sheets at about 400 kPa. A final dry matter c
