ASTM_F_1151_-_88_2003.pdf

Designation:F 1151 88(Reapproved 2003)Standard Test Method forDetermining Variations in Hardness of Film RibbonPancakes1This standard is issued under the fixed designation F 1151;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon(e)indicates an editorial change since the last revision or reapproval.1.Scope1.1 This test method covers the determination of variationsin hardness of film ribbon pancakes.1.2 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2.Definitions2.1 pancakea section of ribbon usually wound on a corein such a manner to allow it to be inserted in an individualribbon cartridge.2.2 hardnessthe ability of the pancake to resist verticaldeflection when a load is applied axially to its core.2.3 coreusually a cylindrical plastic tube on which aribbon is wound.2.4 slittera piece of machinery designed to slit the widthof large ink-coated film rolls and wind the narrow film intoindividual pancakes.3.Summary of Test Method3.1 On rewinding an inked ribbon,each layer of inked filmshould be rewound with an equal force resulting in a uniformhardness of a pancake.However,the hardness nearer to thecore is usually higher than nearer to the periphery.3.2 To determine the variations in hardness,a pancake is putunder a known vertical load until a part of it is telescoped.Theloading is continued as other portions of the pancake telescope.The load and position,that is,diameter of telescoping,at eachload level is noted.Load testing continues until the thirdtelescoping is observed.3.3 All tests must be performed in duplicate under the sameconditions in order to compare results.4.Significance and Use4.1 This test method enables a comparison of variation inhardness between pancakes and allows slitter operators toadjust and maintain the desired rewinding force.5.Interferences5.1 Wide variations in environmental conditions(tempera-ture,relative humidity)could affect the pancake hardness.5.2 Pancake hardness will be affected by changes in pan-cake diameter,width,coating formulation,base film thickness,and base film composition.Hardness will also be affected bythe physical characteristics of the core used for the pancake.6.Apparatus and Materials6.1 Pancake Tester2See Fig.1.6.2 Any Special Thrust Pads required for the pancakesbeing tested.6.3 Pancakes to be tested.7.Test Specimen7.1 The test specimen shall be an entire pancake which hasnot been physically distorted in the direction perpendicular tothe axis of the core after it was produced on the slitter.8.Conditioning8.1 Although no special conditioning of pancakes is re-quired,compare only tests run under the same relative envi-ronmental and lapsed time from rewinding.9.Procedure9.1 Shift the manual sliding valve(Fig.1,Item 1)to the“OFF position.9.2 Push the piston rod(Fig.1,Item 2)vertically upwards tothe stop.9.3 Shift the manual sliding valve to the“ON position.1This test method is under the jurisdiction ofASTM Committee F05 on BusinessImaging Products and is the direct responsibility of Subcommittee F05.02 onInked-Transfer Imaging Products.Current edition approved May 27,1988.Published July 1988.2The WEY Universal Pancake Tester,Type UPT 125/50(with InstructionManual),has been found satisfactory for this purpose.Available from S.M.Engineering,A.G.,Roosstrasse 49,CH-8832,Woller AU,Switzerland.1Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959,United States.9.4 Mount thrust pad(Fig.1,Item 3)by screwing it into thepiston rod.Note that this step is only applicable if a specialthrust pad is needed for the pancake to be tested.Normally,astandard thrust pad is part of the basic test apparatus.9.5 Place the pancake on the center plate(Fig.1,Item 4).See that the core of the pancake is approximately on the centerof the centering plate.9.6 Pump the hand pump(Fig.1,Item 5),to lower the pistonrod slowly until the thrust pad is centered as illustrated in Fig.2.The cone of the thrust pad should lightly touch the core bypumping carefully and lightly.Set the hand on the dial(Fig.1,Item 6)on zero by turning the red maximum indicator counterclockwise.9.7 Increase the pressure by pumping slowly until a certainsection of the pancake is telescoped vertically 1.5 to 2 mm asillustrated in Fig.3.This depth can be determined by thegraduated millimetre scale(Fig.1,Item 7).The load needed forthis displacement is shown on the dial(Fig.1,Item 6)in WEYand newton units.9.8 To determine hardness in various sections of the pan-cake,the force should be increased by slowly pumping,untilthe second and third telescoping take place(see Fig.4).Insome cases,increased