ASTM_D_3708_-_88_2000.pdf

Designation:D 3708 88(Reapproved 2000)An American National StandardStandard Test Method forWeight of Wax Applied During Curtain Coating Operation1This standard is issued under the fixed designation D 3708;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 the weightof hot melt coating applied to corrugated board by curtaincoating.It is intended to be used for routine process control inthe plant.NOTE1Related methods for determining the weight of wax coatinginclude the following:Test Method D 3521;Test Method D 3522,and TestMethod D 3344.21.2 The values stated in SI units are to be regarded as thestandard.The values given in parentheses are for informationonly.1.3 This standard may involve hazardous materials,opera-tions,and equipment.This standard does not purport toaddress all of the safety problems associated with its use.It isthe responsibility of the user of this standard to establishappropriate safety and health practices and determine theapplicability of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:D 3344 Test Method for Total Wax Content of CorrugatedPaperboard2D 3521 Test Method for Surface Wax Coating on Corru-gated Board2D 3522 Test Method for Applied Coating Wax and Impreg-nating(Saturating)Wax in Corrugated Board Facing23.Terminology3.1 Definitions:3.1.1 wax loadingthe weight of wax present primarily asa surface film but including the minor part embedded in thesurface fibers of corrugated board.It is expressed as weight perunit area,usually in grams per square metre or pounds perthousand square feet of board.4.Summary of Test Method4.1 The amount of wax applied to corrugated board bymeans of a curtain coater is determined by attaching a foldedsheet of paper to production corrugated board,running thecombination through the curtain coater,and subsequentlydetermining the applied weight of wax on the sheet of paper.5.Significance and Use5.1 Wax coatings are applied to corrugated board to providea barrier against moisture or other penetrants or to provideimproved appearance or abrasion resistance.These functionalproperties are influenced by the amount of wax present on thesurface.5.2 During curtain coating operations,major portions of thewax will congeal on the surface,while a minor portion willpenetrate and become embedded in the fibers of the facing.This method measures the total weight of wax applied to theboard.The amount actually remaining on the surface of thecorrugated board can be determined by Test Method D 3521.5.3 The uniformity of application of wax film across thewidth of the curtain coater may also be determined using thistechnique by passing test combinations(blanks)under thecurtain at various locations,that is,left side,center,right side.6.Apparatus6.1 Sample Trimming EquipmentA suitable trimmingboard or template arrangement equipped with a razor edgeknife for even cutting of specimens to the required size withparallel edges.6.2 Measuring Rule,steel-edged,for measuring the size ofspecimens to within 0.5 mm.6.3 Test PaperAny good quality typing bond with about25%cotton fibers approximately 200 by 300 mm(812by 11in.).6.4 Pressure-Sensitive Tape,to attach the test paper to thecorrugated carrier board.6.5 Carrier BoardProduction uncoated corrugated board,not less than 450 by 750 mm(18 by 30 in.).Die cut,slotted,and printed box blanks are acceptable.6.6 Analytical Balance,capable of reproducing weighingsto the nearest 0.001 g.7.Sampling and Test Specimens7.1 Prepare test blanks by folding the 200 by 300-mm(812by 11-in.)sheets of the test paper in half in the 300-mmdimension.Assure that all folded edges are approximatelysuperimposed on each other.Crease the fold firmly with thefingers.Then place the folded sheet about in the center of a1This test method is under the jurisdiction of ASTM Committee D02 onPetroleum Products and Lubricantsand is the direct responsibility of SubcommitteeD02.10.0Aon Physical and Chemical Properties.Current edition approved Oct.31,1988.Published January 1989.Originallypublished as D 3708 78.Last previous edition D 3708 78(1983).2Annual Book of ASTM Standards,Vol 05.02.1Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959,United States.suitable piece of corrugated carrier board and tape it firmly tothe board around its entire periphery with pressure-sensitiveadhesive tape.7.2 Prepare duplicate test blanks(carrier boards with at-tached folded sheets as described in 7.1)for each test unit.Prepare a supply of test blanks ahead of time and keep themavailable at the machine for determining the amount of waxapplied.NOTE2The test sheets do not require preconditioning since the paperis only a carrier for the