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PolymerProcessingMoldingPapersHandlay-upprocess1.BriefintroductionHandLay-upprocessisalsocalledcontactmolding,whichjobistoturnoftheglassfiberfabricandresininthemoldshop,andthensolidifiedformingprocessforglassfiberreinforcedplasticproducts.InChina,handlay-upprocessoccupiedabout80%ofallthermosettingresinmatrixescompositemoldingprocessinthegrossdomestic,whichisusedtheearliestandmostwidely,asamoldingmethod,inthermosettingresinmatrixcompositematerialmolding.2.ProcessDescription(1)ProductionPreparationconstructionsite:thesizeoftheworkplaceshouldbebasedonproductsizeandoutputdecisions,thesitedemandsclean,dryandwellventilated,theairtemperatureshouldbemaintainedatbetween15~35℃,afterprocessing,renovatedsectionshouldincludeadustextractionandsprinklers.Moldpreparation:preparationworkincludingcleaning,assemblingandcoatingrelease,etc.Resingluemake-up:weshouldpayattentiontotwoproblems:①Theglueshouldpreventairbubblesinthemix;②Assignedglueamountcannotbetoomuch,eachamountshouldensureitbecometheresingelbeforerunningout.Enhancedmaterialpreparation:toenhancethetypesofmaterials,thechoiceshouldrelatetotherequirementsandspecifications.(2)PastemakingandsolidificationTherearetwokindsofhand-laminatedpastemaking,namelywetanddry.Drystackingistousepre-pregclothasrawmaterial,agoodfirstmaterial(fabric)bysamplecutintoabadmaterial,layersoftenswhenheated,andthenlevelbylevel,closetothemold,andtoruleoutinterlayerbubbles,sothatdense.Thismethodisusedforpressingcansandbagsofpressuremolding.Shopwetlayerisdirectlyputreinforcedmaterialcordinthemold,closetothedielevelbylevel,thelessbubbles,tomakeitdense.Handlay-upmethodhasbeenappliedmoregenerallycraftshopfloor.Shopfloorwetgelcoatlayerisfurtherdividedintothesystemandstructureofthelayerofpastepastesystem.Inaddition,thehandlay-uptooltoensureproductqualitygreatly.Generallyhavewoolroller,rollerbristles,spiralrollers,andelectricsaws,electricdrills,grindingandpolishingmachines.Productscuredsub-hardeningandmaturationintwostages.Triangulationfromthegeltoageneral24h,atthistimecuringdegreeof50%to70%(Barcolharddegree15),maybestripping,de-curedundernaturalenvironmentalconditionsafter1to2weeksinordertomakeproductswiththemechanicsstrength,saidtheagingofitscuringdegreeof85%ormore.Heatingcanpromotetheripeningprocess,pairsofglassfiberreinforcedpolyester,80℃heating3h,pairsofglassfiberreinforcedepoxyaftercuringtemperaturecanbecontrolledat150℃orless.Heatcuringmanyways,smallandmediumproductscanbeheatedduringthecuringovencuring,large-scaleproductscanbeusedin-moldheatingorinfraredheating.(3)StrippingandfinishingStrippingisdesignedtoensureproductsfreefrominjury.Strippingmethodhasthefollowingseveralkinds:①thedieontopofastrippingejectorembeddeddevices,strippingwhentherotatingscrew,theproductejection.②pressureejectionofcompressedairorwater,leavingmoldontheentrance,strippingwillbecompressedairorwater(0.2MPa)betweenthepressureintothemoldsandproducts,whilewoodhammerandrubberhammertofight,sothatseparationofproductsandmolds.③large-scaleproducts(suchasboats)strippingcantakeadvantageofjacks,cranesandhardwedgetools.④complexproductscanbeusedhand-strippingmethodfirstpasteinthemoldsystemoftwothree-storyglassfiberreinforcedplastic,canwaituntilthecuredpeelfromthemold,andthencontinuetopastethesystemonthemoldtothedesignthickness,curedeasilyfromthemoldoffdown.Finishingcanbedividedintotwokinds,oneisthesizetrimmed,theotheristhebugfixes.①Sizetrimmedisaftermoldingproducts,accordingtodesigndimensionstocutoutexcesssuperfluousparts;②bugfixes,includingperforationrepair,airbubbles,cracks,patches,brokenholereinforcementandsoon.3.ThecharacteristicsofHandlay-upHandlay-upprocessthefollowingadvantages:1.Withoutsophisticatedequipment,justasimplemold,tools,andthereforelessinvestment,quickbearfruit,issuitableforthedevelopmentofChina'stownshipenterprises;2.Productiontechnologyiseasytomaster,onlyshort-termtrainingcanbecarriedoutafterproduction;3.FRPproductswillnotbelimitedbysizeandshape,suchaslargecruiseships,cupolas,gutters,etc;4.Whichcanbemadeintoonecompositewithothermaterialssuchasmetal,wood,foam,etc.)atsametime5.Tothoselargesizeproductswhichisinconvenienttotransport(suchaslargepot,largeroof),itenableson-siteproduction.However,thehandlay-upprocessalsohasmanydisadvantages:1.Theproductionefficiencyislow,slowspeedandlongproductioncycle,donotfitforhigh-volumeproducts;2.Theproductqualityisnotstableenough.Astheoperatorskilllevelandproductionofdifferentenvironmentalconditions,thereforetheimpactofproductqualityandstabilitycanbedifferent;3.Theproductionenvironmentispoor,unpleasantsmell,longerworkinghoursandmoredust,soitmustbeaddressedfromthelaborprotection.Anyway,thehandlay-upprocesshastheadvantagewhichotherprocessmethodscannotsubstitute,anditsshortcomingsmustbeovercomeduringtheoperation.4.DevelopmentprospectsHandlay-upcanbewidelyusedincompositematerialsindustry.Takeglassfiberreinforcedplasticforexample,basedonglassfiberreinforcedplasticmoldhandlay-uptechnologyhastherapidity,highprecision,simpleprocess,easyoperation,etc.whichcanbedesignedfrompromptideasintorealproducts