Tshuab moulding yog cov txheej txheem los ntawm cov khoom tsim los ntawm kev sib xyaw ntawm cov molten resin rau Žfill pwm kab noj hniav uas xav tau cov duab thiab qhov ntev.Compression molding yog cov txheej txheem qub tshaj plaws rau kev tsim cov khoom polymer, thiab feem ntau yog siv rau cov thermosets.
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Tshuab molding
Tshuab moulding yog txheej txheem los ntawm cov khoom tsim los ntawm kev sib xyaw ntawm cov molten resin rau Žfill lub pwm kab noj hniav uas xav tau cov duab thiab qhov ntev.Lub raj mis rau cov dej qab zib thiab lwm yam kua yog tshuab moulded.Ob txheej txheej txheem tseem ceeb tshaj plaws yog extrusion tshuab moulding thiab txhaj tshuaj molding.In extrusion tshuab moulding, extruder twj tso kua mis los ntawm annular tuag los tsim ib lub raj molten los yog parison nrog zoo deŽ ned thiab tswj qhov ntev.Lub parison yog clamped nruab nrab ntawm ob lub puab halves thiab yog nyob rau hauv ated los ntawm cov huab cua nyob rau hauv lub siab kom coj cov duab ntawm pwm kab noj hniav, uas feem ntau yog txias.Thaum kawg, cov ntawv tsim solidiŽ es raws li kev ua kom txias thiab cov pwm qhib kom tshem tawm cov ntawv tsis muaj kev puas tsuaj.Nyob ntawm qhov thermal stability ntawm cov khoom, cov txheej txheem extrusion tuaj yeem ua tsis tu ncua los yog cuam tshuam.Cov tshuab tsis sib xws tuaj yeem siv cov ntsia hlau reciprocating uas ua haujlwm li rams, tib yam li hauv kev txhaj tshuaj molding.
Txhaj tshuab moulding yog ob theem txheej txheem.Nyob rau hauv thawj theem, cov yas yog txhaj rau hauv kab noj hniav uas lub preform yog molded.Lub preform yog ces pauv mus rau lub tshuab pwm rau hauv fiation.Txhaj tshuab moulding muaj qhov zoo ntawm kev tswj qhov tseeb, tshem tawm cov khoom seem thiab molding hauv cov xov ua ntej tshuab.Extrusion tshuab moulding yog nyiam rau cov thawv ntim nrog qhov ntev / txoj kab uas hla thiab rau cov khoom siv nrog tes.
Polyethylene terephthalate los yog PET yog cov polymer feem ntau siv hauv kev txhaj tshuaj molding, rau cov dej haus carbonated thiab cov fwj dej.Stretch tshuab moulding yog siv los tsim PET lub raj mis ntawm kev txhim kho lub cev.Nyob rau hauv cov txheej txheem no, stretching induces tsim ntawm me me lamellar crystals.Cov khoom siv lead ua no ua rau cov khoom lag luam pob tshab thiab tawv dua li cov khoom uas tsis muaj ncab tshuab, uas muaj spherulitic crystals.
Compression molding
Compression molding yog cov txheej txheem qub tshaj plaws rau kev tsim cov khoom siv polymer, thiab feem ntau yog siv rau cov thermosets.Nyob rau hauv cov txheej txheem no lub compound yog nias nyob rau hauv lub pwm los ntawm rhuab platens ntawm ib tug hydraulic xovxwm.Qhov txheej txheem no yog ib qho piv txwv rau cov ntawv hlau stamping.Txhaj tshuaj molding ntawm polymers tau hloov compression molding rau qee cov polymers, vim qhov zoo ntawm cov khoom tuav thiab automation.Txawm li cas los xij, compression molding muaj qhov zoo dua hauv kev ua cov polymers muaj zog.Owing rau theem qis ntawm deformation thiab kev ntxhov siab koom nrog hauv compression molding, cov fibers reinforcing tsis puas.Muaj fiber ntau ntau thiab ntev Žfibres tuaj yeem suav nrog hauv cov khoom siv molded
Post lub sij hawm: Jan-01-2017