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(parison)m

2、aterialcenteredinthemold.Themoldisclosedandgaspressureisusedtoexpandtheparisontofitthemoldcavity.Composite:Amaterialormaterialssystemcomposedofamixtureorcombinationoftwoormoremicroconstituentsormacroconstituentsthatdifferinformandchemicalcomposition.CompressionMolding:Theco

3、mpressionmoldingprocessusesmatchedsteelmoldstocompressaweighed"charge"ofsheetmoldingcompoundintoanewandspecificshape.Ditacticpolymer:Apolymerthatcontainstwositesofstereoisomerismsinthemainchainoftheconfigurationalbaseunit.Elastoplastic:Anelastomerthatcontainstransientcrossl

4、inks,unlikemostelastomers;itsoftenswhenheatedforprocessingandbecomessolidyetmaintainsitselasticbehavioruponcooling.Elastoplasticsarederivedfrompolyolefin's,polyurethane,polyestersandstyrenecopolymers.Elastoplasticity:Thestateexhibitedbyamaterialthathasdeformedbothelasticall

5、yandplastically.Extrusionblowmolding:Amethodofprocessingpolymersintheformofanopen-endtubsurroundedbyamold.Thetubeisusedtoincreaseairpressuretoexpandthematerialtofitthemold.Fiberglass:Usedtoreinforceand/orstrengthenplastics.Hydroplasticity:Theoccurrenceofplasticbehavior.Inje

6、ctionmolding:Aprocesswheremoltenplasticisinjectedintoamold.About60%ofallplasticsprocessingmachinesareinjectionmoldingtypes.LPMC™:Alowpressuremoldingcompound,similartosheetmoldingcompound(SMC),butismoldableatpressuresaround100lbs/psi.Micromoulding:Anemergingtechnologythattak

7、esinjectionmoldingtechnologydowntoasmallerscale.Mold24i:isanewmaterial-evaluationfeaturethatusesthepressasatooltogaugemeltviscosityanddetermineoperatingtemperatures,pressuresandvelocities.Mold:Ahollowformintowhichmoltenplasticispouredtoformadesignedshapewhenthematerialcools

8、.Plasticanisotropy:Variationsindirectionsintheresistanceofamaterialtoplasticdeform