1、 g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58Accelerated speed method using the IGT-type tester (electric model) ICS 85.060Paper and board Deter
2、mination of resistance to picking BRITISH STANDARDBS ISO 3783:2006BS ISO 3783:2006This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 August 2006 BSI 2006ISBN 0 580 48670 2Cross-referencesThe British Standards which implement international or
3、publications referred to in this document may be found in the BSI Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Search” facility of the BSI Electronic Catalogue or of British Standards Online.This publication does not purport to include all the
4、 necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations.Summary of pagesThis document comprises a front cover, an inside front cover, the ISO title page, pages ii to v, a blan
5、k page, pages 1 to 12, an inside back cover and a back cover.The BSI copyright notice displayed in this document indicates when the document was last issued.Amendments issued since publicationAmd. No. Date CommentsA list of organizations represented on this committee can be obtained on request to it
6、s secretary. present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep UK interests informed; monitor related international and European developments and promulgate them in the UK.National forewordThis British Standard reproduc
7、es verbatim ISO 3783:2006 and implements it as the UK national standard. It supersedes BS 6225-2:1982 which is withdrawn.The UK participation in its preparation was entrusted to Technical Committee PAI/11, Method of test for paper, board and pulps, which has the responsibility to: aid enquirers to u
8、nderstand the text;INTERNATIONALSTANDARDISO3783Second edition2006-07-01Reference numberISO 3783:2006(E)Paper and board Determination of resistance to picking Accelerated speed method using the IGT-type tester (electric model)Papier et carton Dtermination de la rsistance larrachage Mthode dimpression
9、 vitesse acclre avec lappareil de type IGT (modle lectrique)BS ISO 3783:2006iiiiiContents Page1 Scope 12 Normative references 13 Terms and definitions 14 Apparatus . 24.1 Inking device 24.2 Printing device . 34.3 Evaluation devices 44.4 Materials and aiding devices 45 Sampling, conditioning and samp
10、le preparation . 55.1 Sampling 55.2 Conditioning 55.3 Sample preparation . 56 Procedure . 56.1 Preparation and adjustment of apparatus 56.1.1 Selection of pick-test oil and end-velocity . 56.1.2 Ink pipette (if applicable) . 56.1.3 Preparation of inking device . 66.1.4 Preparation of the printing de
11、vice 66.2 Testing of test strips . 66.3 Assessment of results 76.3.1 Assessment of the result on paper 76.3.2 Assessment of the result on board 76.4 Completion of the test 77 Expression of results 78 Precision . 99 Test report 9Annex A (informative) Checking the printing device and the inking device
12、 . 10Annex B (informative) Pick-test oil application . 11Annex C (informative) Appearance of pick 12BS ISO 3783:2006ivForewordISO (the International Organization for Standardization) is a worldwide federation of national standards bodies(ISO member bodies). The work of preparing International Standa
13、rds is normally carried out through ISOtechnical committees. Each member body interested in a subject for which a technical committee has beenestablished has the right to be represented on that committee. International organizations, governmental andnon-governmental, in liaison with ISO, also take p
14、art in the work. ISO collaborates closely with the InternationalElectrotechnical Commission (IEC) on all 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 pr
15、epare International Standards. Draft International Standardsadopted by the technical committees are circulated to the member bodies for voting. Publication as anInternational Standard requires approval by at least 75 % of the member bodies casting a vote.Attention is drawn to the possibility that so
16、me of the elements of this document may be the subject of patentrights. ISO shall not be held responsible for identifying any or all such patent rights.ISO 3783 was prepared by Technical Committee ISO/TC 6, Paper, board and pulps, Subcommittee SC 2, Testmethods and quality specifications for paper a
17、nd board.This second edition cancels and replaces the first edition (ISO 3783:1980), which has been technically revised.The main changes are in the use of a pick-start viewer for the assessment of the start of the pick ordelamination, the use of the viscosity of the pick-test oils for normalisation
18、of the resuls to 23 C, and the cleardefinition of the velocity profile for the testers.BS ISO 3783:2006vIntroductionPick is the name commonly given to damage to the paper surface occurring during the printing operation. Whenthe printing form is lifted from the paper, the ink exerts on the paper a fo
19、rce, which increases with increasingviscosity and tack of the ink and with increasing printing speed. When this force exceeds a critical value, whichdepends on the paper, the surface of the paper is damaged.The minimum printing speed at which pick occurs is a measure of the pick resistance of the pa
20、per.Using specified testing equipment, the paper or board is printed with a pick-test oil of known viscosity, atconstant printing force and at an increasing velocity. Pick velocity and pick resistance are derived from thedistance between the starting point of the print and the point on the print whe
21、re the first damage is observed.In the case of paperboard when the adhesion between the outer layer and the next layer is too low, delaminationbetween the layers can occur during printing.BS ISO 3783:2006blank1Paper and board Determination of resistance to picking Accelerated speed method using the
22、IGT-type tester (electric model)1ScopeThis International Standard specifies an accelerated speed method for determining the surface strength interms of the pick velocity and pick resistance of coated and uncoated paper and board, and in terms of thedelamination resistance of the liner on paperboard,
23、 by simulating the behaviour in the printing process.Because of the limited area tested and the general character of the test, it will not usually detect localimperfections such as surface debris.This test is especially important for papers and boards which are to be printed in lithographic offset o
24、rletterpress, because the inks used in these techniques traditionally have a high viscosity and high tack values.Due to the increasing tendency for the tack and viscosity of modern flexographic inks to be high, this method isalso useful in that field.In the interpretation of the test results, attent
25、ion must be given to the fact that the results can be seriouslyinfluenced by differences in testing conditions, differences in instruments and differences in the calibration stateof the test equipment.The pick velocity, etc., determined here should not be interpreted as being the running speed of a
26、printing pressin practice.NOTE 1 Although IGT-type testers of the pendulum type are outside the scope of this International Standard, the describedmethod can also be used for these instruments. The results will be slightly different, due to the difference in velocity profile.NOTE 2 The use of the We
27、stvaco type device and the use of tack-graded inks are not covered by this InternationalStandard.2 Normative referencesThe following referenced documents are indispensable for the application of this document. For datedreferences, only the edition cited applies. For undated references, the latest ed
28、ition 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 testing and procedure formonitoring the atmosphere and conditioning of samples3 Terms and definiti
29、onsFor the purposes of this document, the following terms and definitions apply.3.1 pickrupture of the surface layer of a paper or a board during manufacture or printing, which occurs when an externaltensile force applied normal to the surface is greater than the cohesion of the paper or boardBS ISO
30、 3783:20062NOTE In the case of coated papers, the rupture may take the form of particles of coating or fibres wholly or partly detachedfrom the sheet, blistering or gross stripping. In the case of uncoated papers, the rupture normally takes the form of theremoval of fibre aggregates and is difficult
31、 to determine due to the paper surface structure, since the visual assessment iseasily influenced by human factors.3.2 pick velocityvelocity at which pick of the surface of the printed paper begins under the conditions defined in this InternationalStandard3.3 pick resistancevelocity at which the sur
32、face of the paper begins to exhibit pick at a pick-test oil temperature of 3.4 liner liftingseparation of one or more layers of the board caused by the application of a force normal to the surface3.5 delamination velocityvelocity at which delamination of the surface of the printed paper begins in th
33、e equipment defined in thisInternational Standard3.6 end-velocityset velocity to be reached after of the print3.7 delamination resistancevelocity at which delamination begins at a pick-test oil temperature of 4 Apparatus4.1 Inking device4.1.1 Inking device, consisting of two or more inking drums hav
34、ing contact with a top-roller. The ink-distributing surface area of the rollers shall be known to the nearest . Each inking arrangement shallincorporate one or more holders, on which the printing discs to be inked in can be mounted.The distributing surface area is calculated as:(1)whereis the diamet
35、er of roller or drum number ( );is the effective length of roller or drum number ( );is the number of rollers excluding the printing disc.pP(23)23Cde200 mmD(23)23CA 0,1 cm2AA =nsummationdisplay1( dn ln)dnnlnnnBS ISO 3783:20063NOTE 1 The lifetime of the rubber- or elastomer-covered parts is limited,
36、if properly handled, to a maximum ofapproximately 3 years.NOTE 2 The transfer characteristics of rubber rollers can be changed by, for example, using them for different applications,inks, bad cleaning, unsuitable cleaning solvents and ageing. If tests are made using different top-rollers, it is impo
37、rtant thatthe top-rollers are identical, and a test to determine the ink transfer may have to be performed.NOTE 3 The terms “inked in” and “ink” are used here to conform to general usage, even when a pick-test oil is used insteadof an ink.4.1.2 One or more aluminium printing discs, wide, with smooth
38、 edges, a diameter ofand a temperature-insulating handgrip.4.1.3 Ink pipette, for applying an accurate quantity of pick-test oil to the inking device, having a minimumvolume of and a resolution of at least , but preferably .NOTE If the inking device is equipped with a dispensing system with sufficie
39、nt accuracy, no ink pipette is required.4.2 Printing device4.2.1 Printing device, having a sector with a radius of , incorporating a facility enabling apacking (see 4.2.2) to be mounted on the sector under tension, and a test piece to be mounted on the packing.The sector shall be capable of being dr
40、iven over a distance of at a uniformly increasing velocity:(2)whereis the velocity increase;is the distance increase.The actual velocity shall not differ by more than from the theoretical value over the workable range, asspecified for the tester.The force with which the printing disc contacts the te
41、st piece on the sector shall be adjustable or fixed to theforce specified in this International Standard. The actual force shall not deviate by more than from theset force.It is important that the printing device be properly calibrated with regard to printing velocity and printing forcebetween the p
42、rinting disc and the sector (see Annex A).4.2.2 Packing, consisting of 5 or 6 layers of paper with a total thickness of . Each layer shallhave a grammage of approximately and a thickness of approximately .(10,0 0,2) mm(65,0 0,2) mm2ml 0,01 ml 0,001 ml(85,0 0,2) mm200 mms= constants5% 10 N(1,5 0,1) m
43、m150 g/m20,3 mmBS ISO 3783:200644.3 Evaluation devices4.3.1 Test-piece holder (for paperboard only) for delamination assessment, in the form of a semicirculartrough, with an internal radius of as shown in Figure 1.4.3.2 Pick-start viewer1), to determine the starting point of pick. The pick-start vie
44、wer shall have a light sourcewhich provides grazing incident light to the test piece placed under this device, and a device enabling the testpiece to be observed without magnification at an angle of to the normal, opposite to the light source.NOTE This device is meant to yield a quicker and less var
45、iable result than is obtained without this device. It is not intendedthat the user will search longer for isolated bad spots, and thus obtain a lower pick velocity.4.4 Materials and aiding devices4.4.1 Pick-test oils1), consisting of poly-isobutenes of known viscosity, as indicated in Table 1 (see C
46、lause 7).The composition of each oil shall be finally adjusted so that its performance in a pick test is within of that ofthe corresponding standard oil provided by IGT.NOTE A pick-test oil has a limited shelf life of approximately 3 years, and a maximum open life of 1 year. Storage ortransport at t
47、emperatures below may cause separation or disintegration of the components.4.4.2 Cleaning aids, rags or tissues, lint-free, and mineral spirits or other solvents, as specified for thematerials used.NOTE The rollers made of, or covered with, rubber or plastic are sensitive to certain solvents. Contac
48、t the supplier forinformation concerning the correct solvents to prevent damage that can cause differences in pick-test oil transfer.4.4.3 Thermometer, to read the ambient temperature near the printing device to the nearest , with anaccuracy of .4.4.4 A ruler with a minimum length of , to measure th
49、e distance from the print starting point to thepick starting point, with an accuracy of .Figure 1 Delamination viewer1) Accessories including a Pick-Start Viewer and pick-test oils can be obtained from IGT, P.O. box 12588, 1100 ARAmsterdam, The Netherlands (www.igt.nl). This information is given for the convenience of the users of this document anddoes not constitute an endorsement by ISO of the products from IGT. Equivalent products may be used if they can beshown to lead
