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Veneered Particle Board Pdf Free

 
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MessagePosté le: Ven 7 Oct - 13:30 (2016)    Sujet du message: Veneered Particle Board Pdf Free Répondre en citant




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Particle...board,...also...known...as...particleboard...and...chipboard,...is...an...engineered...wood...product...manufactured...from...wood...chips,...sawmill...shavings,...or...even...sawdust,...and...a...synthetic...resin...or...other...suitable...binder,...which...is...pressed...and...extruded....Medium-density...fibreboard...and...hardboard,...also...called...high-density...fiberboard,...are...stronger...and...denser...than...particleboard....^..^.."Wood..dust..hazards"..(pdf)...Melamine..Urea..phenolic..formaldehyde..resins..exist..as..a..compromise...Many.other.building.materials.such.as.furniture.finish,.carpeting.and.caulking.give.off.formaldehyde,.as.well.as.Urea-formaldehyde.foam.insulation,.which.is.banned.in.Canada.for.installation.in.a.residential.closed.cavity.wall.[4].Formaldehyde.is.classified.by.the.WHO.as.a.known.human.carcinogen.[5]..Two.such.jets,.reversed,.allow.the.particles.to.build.up.from.fine.to.coarse.and.back.to.fine..However,..particleboard..can..be..made..more..attractive..by..painting..or..the..use..of..wood..veneers..onto..surfaces..that..will..be..visible...^..."Formaldehyde...Factsheet"...(webpage)....Though...it...is...denser...than...conventional...wood,...it...is...the...lightest...and...weakest...type...of...fiberboard,...except...for...insulation...board....Urea.Melamine.resins.are.used.to.offer.water.resistance.with.increased.melamine.offering.enhanced.resistance..

More.recently,.graded-density.particleboard.has.also.evolved..During.the.war,.phenolic.resin.was.more.readily.accessible.than.top.grade.wood.veneer.in.Germany,.and.Luftwaffe.pilot.and.inventor.Max.Himmelheber.played.a.role.in.making.the.first.sheets.of.particleboard,.which.were.little.more.than.pourings.of.floor.sweepings,.wood.chips,.and.ground.up.off-cuts.and.glue.[citation.needed].The.first.commercial.piece.was.produced.during.World.War.II.at.a.factory.in.Bremen,.Germany.[clarification.needed].For.its.production,.waste.material.was.used.-.such.as.planer.shavings,.offcuts.or.sawdust.-.hammer-milled.into.chips.and.bound.together.with.a.phenolic.resin..One...may...note...the...amount...of...sag...in...a...shelf...of...a...given...width...in...order...to...draw...the...distinction....Amino-formaldehyde.based.resins.are.the.best.performing.when.considering.cost.and.ease.of.use..The..raw..material..to..be..used..for..the..particles..is..fed..into..a..disc..chipper..with..between..four..and..sixteen..radially..arranged..blades..(the..chips..from..disk..chippers..are..more..uniform..in..shape..and..size..than..from..other..types..of..wood..chipper)...Safety..concerns..are..two..part,..one..being..fine..dust..and..chemicals..released..when..particleboard..is..machined..(e.g.,..sawing..or..routing)...Although..the..use..of..two..or..three..layers..of..wood..veneer..is..ancient,..modern..4'..x..8'..sheets..of..plywood..with..5-11..core..layers..of..veneer..were..invented..in..the..early..20th..century,..and..began..to..become..common..by..the..Second..World..War...The...advantages...of...using...particleboard...over...veneer...core...plywood...is...it...is...more...stable,...(unless...it...gets...wet),...much...cheaper...to...buy,...and...somewhat...more...convenient...to...use....Therefore,..it..is..rarely..used..outdoors..or..in..places..where..there..are..high..levels..of..moisture,..with..the..exception..of..some..bathrooms,..kitchens..and..laundries,..where..it..is..commonly..used..as..an..underlayment..-..in..its..moisture..resistant..variant..-..beneath..a..continuous..sheet..of..vinyl..flooring...Occupational..exposure..limits..exist..in..many..countries..recognizing..the..hazard..of..wood..dusts.[2]..Cutting..particle..board..can..release..formaldehyde,..carbon..monoxide,..hydrogen..cyanide..(in..the..case..of..amino..resins)..and..phenol..(in..the..case..of..phenol-formaldehyde..resins).[3]..The..other..concern..is..with..the..slow..release..of..formaldehyde..over..time...

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