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(pari

2、son)materialcenteredinthemold.Themoldisclosedandgaspressureisusedtoexpandtheparisontofitthemoldcavity.Composite:Amaterialormaterialssystemcomposedofamixtureorcombinationoftwoormoremicroconstituentsormacroconstituentsthatdifferinformandchemicalcomposition.CompressionMol

3、ding:Thecompressionmoldingprocessusesmatchedsteelmoldstocompressaweighed"charge"ofsheetmoldingcompoundintoanewandspecificshape.Ditacticpolymer:Apolymerthatcontainstwositesofstereoisomerismsinthemainchainoftheconfigurationalbaseunit.Elastoplastic:Anelastomerthatcontains

4、transientcrosslinks,unlikemostelastomers;itsoftenswhenheatedforprocessingandbecomessolidyetmaintainsitselasticbehavioruponcooling.Elastoplasticsarederivedfrompolyolefin's,polyurethane,polyestersandstyrenecopolymers.Elastoplasticity:Thestateexhibitedbyamaterialthathasde

5、formedbothelasticallyandplastically.Extrusionblowmolding:Amethodofprocessingpolymersintheformofanopen-endtubsurroundedbyamold.Thetubeisusedtoincreaseairpressuretoexpandthematerialtofitthemold.Fiberglass:Usedtoreinforceand/orstrengthenplastics.Hydroplasticity:Theoccurre

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

7、ng:Anemergingtechnologythattakesinjectionmoldingtechnologydowntoasmallerscale.Mold24i:isanewmaterial-evaluationfeaturethatusesthepressasatooltogaugemeltviscosityanddetermineoperatingtemperatures,pressuresandvelocities.Mold:Ahollowformintowhichmoltenplasticispouredtofor

8、madesignedshapewhenthematerialcools.Plasticanisotropy:Variationsindirectionsintheresistanceofamaterialtoplasticdeform