ASTM_D_4466_-_02_2018.pdf

Designation:D446602(Reapproved 2018)Standard Terminology Related toMulticomponent Textile Fibers1This standard is issued under the fixed designation D4466;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()indicates an editorial change since the last revision or reapproval.1.Scope1.1 Man-madepolymerscanbecombinedduringmanufacture,or natural polymers can be formed duringgrowth,to produce multicomponent fibers having specialproperties such as cross dyeability,differential shrinkage,orbulk.This standard contains terms which can be used todescribe the physical arrangement of components of suchfibers.The schematic diagram in Annex A1 provides a guidefor interpreting the terminology used in describing two-andthree-component fibers,but is not intended to be limiting.Some examples of usage are given in Annex A2,and abibliography of related literature is given in Appendix X1.1.2 For definitions of other textile terms,refer to Terminol-ogy D123.1.3 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:2D123 Terminology Relating to TextilesGeneric Class3.Terminologygeneric class,nas used with textile fibers,a grouping havingsimilar chemical compositions or specific chemical charac-teristics.DISCUSSIONIn the United States,the generic names and definitionsof man-made fibers,such as nylon,polyester,and acrylic,are publishedby the Federal Trade Commission in“Rules and Regulations Under theTextile Fiber Products Identification Act.”Technically,fibers may bebigeneric,trigeneric,etc.Componentspolymer,na macromolecular material formed by the chemi-cal combination of monomers having either the same ordifferent chemical ponent,nas used with textile fiber polymers,a polymerwith distinguishable properties.bicomponent fiber,na fiber consisting of two polymerswhich are chemically different or physically different,orboth.biconstituent fiber,ndeprecated term.Use the preferredterm bicomponent bigeneric fiber.DISCUSSIONAs used in the Federal Trade Commissions“Rules andRegulations Under the Textile Fiber Products Identification Act,”“biconstituent fiber”is“essentially a physical combination or mixtureof two or more chemically distinct constituents or components com-bined at or prior to the time of extrusion,which if separately extruded,would fall within different.”generic classes.In the preferred ASTMterminology,a biconstituent fiber is a bicomponent bigeneric fiber.It isnot clear from the“Rules”whether a biconstituent fiber has asheath-core,bilateral,or matrix configuration.tricomponent fiber,na fiber consisting of three polymerswhich are chemically different,physically different,or anycombination of such differences.Physical Arrangement of Componentslateral,adja descriptive term for a textile fiber composed oftwo or more polymers at least two of which have acontinuous longitudinal external surface.sheath-core,adja descriptive term for a multicomponenttextile fiber consisting of a continuous envelope whichencases a continuous,central,internal region.(See alsocomponent.)DISCUSSIONBoth the sheath and the core can consist of more thanone component arranged laterally,concentrically,or in matrix.matrix,adja descriptive term for a textile fiber in which oneor more polymeric fibrous material(s)is dispersed in another.Order for Naming Multicomponent Fibers1.Trademark.1This terminology is under the jurisdiction ofASTM Committee D13 on Textilesand is the direct responsibility of Subcommittee D13.58 on Yarns and Fibers.Current edition approved July 1,2018.Published August 2018.Originallyapproved in 1985 1.Last previous edition approved in 2012 as D4466 02(2012).DOI:10.1520/D4466-02R18.2For 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.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.1 2.Physical arrangement of components:bilateral,matrix,sheath-core.3.Number of components:bicomponent,tricomponent,etc.4.Number of generic classes:monogeneric,bigeneric,trigeneric,etc.5.Subparts 1 through 4 to be separated by commas.6.Generic class(es):p