材料英语证书考试(pec)-材料处理词汇

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1、材料英语证书考试(PEC)-材料处理词汇Bagmolding:Aprocessinwhichplasticsaremoldedintocurvedshapesbyapplyingfluidpressurethroughaflexiblecoverthatforcesthematerialtobemoldedagainstarigiddie.Coextrusionblowmolding:Aprocessfortheextrusionofmultilayerproductsusingextrudedmultilayertube(par

2、ison)materialcenteredinthemold.Themoldisclosedandgaspressureisusedtoexpandtheparisontofitthemoldcavity.Composite:Amaterialormaterialssystemcomposedofamixtureorcombinationoftwoormoremicroconstituentsormacroconstituentsthatdifferinformandchemicalcomposition.CompressionM

3、olding:Thecompressionmoldingprocessusesmatchedsteelmoldstocompressaweighed"charge"ofsheetmoldingcompoundintoanewandspecificshape.Ditacticpolymer:Apolymerthatcontainstwositesofstereoisomerismsinthemainchainoftheconfigurationalbaseunit.Elastoplastic:Anelastomerthatconta

4、instransientcrosslinks,unlikemostelastomers;itsoftenswhenheatedforprocessingandbecomessolidyetmaintainsitselasticbehavioruponcooling.Elastoplasticsarederivedfrompolyolefin's,polyurethane,polyestersandstyrenecopolymers.Elastoplasticity:Thestateexhibitedbyamaterialthath

5、asdeformedbothelasticallyandplastically.Extrusionblowmolding:Amethodofprocessingpolymersintheformofanopen-endtubsurroundedbyamold.Thetubeisusedtoincreaseairpressuretoexpandthematerialtofitthemold.Fiberglass:Usedtoreinforceand/orstrengthenplastics.Hydroplasticity:Theoc

6、currenceofplasticbehavior.Injectionmolding:Aprocesswheremoltenplasticisinjectedintoamold.About60%ofallplasticsprocessingmachinesareinjectionmoldingtypes.LPMC™:Alowpressuremoldingcompound,similartosheetmoldingcompound(SMC),butismoldableatpressuresaround100lbs/psi.Micro

7、moulding:Anemergingtechnologythattakesinjectionmoldingtechnologydowntoasmallerscale.Mold24i:isanewmaterial-evaluationfeaturethatusesthepressasatooltogaugemeltviscosityanddetermineoperatingtemperatures,pressuresandvelocities.Mold:Ahollowformintowhichmoltenplasticispour

8、edtoformadesignedshapewhenthematerialcools.Plasticanisotropy:Variationsindirectionsintheresistanceofamaterialtoplasticdeform