Calenderingistheprocessofsqueezingasoftenedthermoplasticmaterialbetweentwoormorerollstoformacontinuousfilm.Theprocess,originallyadaptedfromtherubberindustry,isamajormethodofproducingplasticfilmandsheet.Thematerialgenerallyusedinthecalenderingprocessisflex...[继续阅读]

    Foamedplastics(alsocalledexpandedorcellularplastics)aremadebyaddingairorgastoaplasticresintoformasponge-likematerial.Moderndevelopmentsinplasticfoammoldinghaveplacedthisamongthemajorprocessingtechniquesoftheindustry.Resinscommonlyusedintheproductionofplas...[继续阅读]

    Thermoformingplasticsheetmaterialinshortthermoformingisoneofthemajorprocessingtechniquesoftheplasticsindustryandalsooneoftheoldest.Sinceearlyattempts,abouttheturnofthecentury,toshapecellulosicsheet,theprocesshasgrownrapidly.Muchofthegrowthisduetoinnovativ...[继续阅读]

    Mixing,beingthefirststepinasequenceofoperations,determinestheefficiencywithwhichsubsequentprocessesmaybecarriedoutandexertsaconsiderableinfluenceonproductperformance.Adequateandconsistentmixingisaprerequisiteforsuccessfulmanufacture.Thetypeofsystemusedfor...[继续阅读]

    Extrudersarewidelyusedintherubberindustryinavarietyofapplications.Inlargemixingsystems,dumpextrudersareusedtoacceptthebatchofmaterialfromaninternalmixerandtogiveitashapesuitableforfurtheroperations.Againinthemixingsystem,mixingextrudersorcontinuousmixersa...[继续阅读]

    Thefirsteffortsofmanufacturingartificialfiberswereconnectedwiththeattemptstoutilizenaturalpolymers,primarilycelluloseandcasein,asrawmaterials.Althoughsyntheticpolymerswerealreadyknownatthattime,theywereconsideredmerelyascuriosawithoututilitarianvalue.Macr...[继续阅读]