ASTM_F_556_-_88_2011.pdf

Designation:F55688(Reapproved 2011)Standard Test Method forCurl of Carbonless Copy Papers1This standard is issued under the fixed designation F556;the number immediately following the designation indicates the year of originaladoption or,in the case of revision,the year of last revision.Anumber in parentheses indicates the year of last reapproval.Asuperscriptepsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This test method covers the determination of the curl ofcarbonless copy papers,that is,the degree of curvature of asheet of these papers when exposed to varying conditions ofhumidity.1.2 This test method may be used for manufacturingcontrol,development,and research.1.3 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.Referenced Documents2.1 ASTM Standards:2D585 Practice for Sampling and Accepting a Single Lot ofPaper,Paperboard,Fiberboard,and Related Product(Withdrawn 2010)3D685 Practice for Conditioning Paper and Paper Productsfor TestingE104 Practice for Maintaining Constant Relative Humidityby Means of Aqueous SolutionsF221 Terminology Relating to Carbon Paper and InkedRibbon Products and Images Made TherefromF549 Terminology Relating to Carbonless Copy Products2.2 TAPPI Standard:TIS 0808 Equilibrium Relative Humidities over SaturatedSalt Solutions43.Definitions3.1 For the definitions of terms curl and carbonless copypaper,refer to Terminology F221 and F549,respectively.4.Summary of Test Method4.1 Sheets of carbonless copy paper are placed on a flatsurface under different conditions of humidity and with acontrolled temperature.The amount of curl is expressed asheight above a flat surface attained by the edge of a carbonlesscopy paper sheet.5.Significance and Use5.1 This test method is intended to measure the amount ofcurl of a carbonless copy paper sheet relative to the flat surfacesupporting the sample.The test is useful as a quality controlmethod and for predicting field performance.6.Interferences6.1 Test results may be subject to change depending on theprevious handling of the samples.The samples should be keptsmooth and flat,preferably in closed plastic bags.Exposure ofthe sample to moisture from hands,contact with liquids,orextremes of temperature or humidities above 58%relativehumidity may alter the samples curl characteristics.7.Apparatus7.1 Template6-in.(152-mm)square metal.7.2 Sharp Knife.7.3 Rule,6-in.(or an equivalent metric rule 150 mm)Therule shall be graduated either in inches with 0.1-in.subdivi-sions or in centimetres with 1-mm subdivisions,and the zeromark must be at the edge of the rule.Also,the width of the ruleshould be a minimum of12in.(12.7 mm)to facilitatesupporting the rule in an upright perpendicular position relativeto the flat supporting surface.7.4 Conditioning Cabinets(see Fig.1.)Humidity cabinets,electric with positive uniform air circulation,capable ofmaintaining the relative humidity and temperature rangesspecified.The cabinets should be free of any hygroscopicmaterials such as wood,fabric,paper,and so forth;sealed fromexternal moisture and either insulated from external tempera-ture changes or used in a room maintained at constant1This test method is under the jurisdiction ofASTM Committee F05 on BusinessImaging Products and is the direct responsibility of Subcommittee F05.06 onCarbonless and Thermal Imaging Products.Current edition approved Oct.1,2011.Published March 2012.Originallyapproved in 1978.Last previous edition approved in 2006 as F55688(2006).DOI:10.1520/F0556-88R11.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.3The last approved version of this historical standard is referenced onwww.astm.org.4Available from Technical Association of the Pulp and Paper Industry(TAPPI),P.O.Box 105113,Atlanta,GA30348;15 Technology Parkway South,Norcross,GA30092.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 temperature.The cabinets should be small,constructed withtransparent sides,14 in.wide by 8 in.high by 26 in.long(metric units 356 by 203 by 660 mm).The front shall overlapthe sides and be hinged to serve as the door.An inverted 6-in.(152-mm)rule can be supported on each wall of the condition-ing cabinet to facilitate testing.The zero mark of the rule shallcoincide with the top of the shelving upon which the sample isplaced.A glass tray holding a saturated salt solution shall beplaced on the bottom of the conditioning cabinet and below theshelving which is perforated to assist circulation.7.5 HygrometerAccurate to 61%relative humidity overa range of 20 to 80%relat