Kev piav qhia ntawm cov txheej txheem tsim, kev kho saum npoo thiab txiav cov txheej txheem los ntawm cov khoom siv hluav taws xob dynamic (A)
Yas molding
Txhaj tshuaj molding, ib txoj hauv kev tsim cov duab rau cov khoom lag luam. Cov khoom siv feem ntau yog siv roj hmab txhaj tshuaj molding thiab yas txhaj tshuaj molding. Kev txhaj tshuaj molding tuaj yeem muab faib ua kev txhaj tshuaj molding compression thiab tuag-casting method. Txhaj tshuaj molding tshuab (abbreviated li tshuab txhaj tshuaj los yog txhaj tshuaj molding tshuab) yog lub ntsiab molding khoom siv yas molding pwm los ua ntau yam duab ntawm cov khoom yas los ntawm thermoplastics los yog thermosets. Kev txhaj tshuaj molding yog tiav los ntawm kev txhaj tshuaj molding tshuab thiab pwm.
Extrusion yog ib txoj hauv kev uas cov khoom yog rhuab thiab plasticized los ntawm kev ua ntawm lub thoob thiab ntsia hlau extruder, thiab thawb rau pem hauv ntej los ntawm cov ntsia hlau, thiab tsis tu ncua hla lub taub hau los ua ntau yam ntoo khaub lig- cov khoom siv los yog semi- khoom.
Kev sib hloov molding yog thawj zaug ntxiv cov yas ntsuas (kua lossis hmoov) rau hauv pwm. Tom qab cov pwm kaw lawm, ua kom nws tig raws ob txoj kab ntsug ntsug thaum cua sov pwm. Cov khoom siv yas hauv pwm yog cuam tshuam los ntawm lub ntiajteb txawj nqus thiab thermal zog. Tom ntej no, nws yog maj mam coated thiab yaj-adhered rau tag nrho saum npoo ntawm cov pwm kab noj hniav, ua rau tib yam li cov pwm kab noj hniav, thiab ces txias, zoo li tus, thiab demolded kom tau ib yam khoom ntawm cov yam uas xav tau. .
Tshuab moulding, tseem hu ua hollow tshuab moulding, yog ib txoj kev tsim cov yas sai sai. Lub tubular yas parison tau los ntawm extrusion los yog txhaj tshuaj molding ntawm cov thermoplastic resin yog muab tso rau hauv ib tug phua pwm thaum nws kub (los yog rhuab mus rau ib tug softened xeev). Tom qab cov pwm raug kaw, compressed cua yog txhaj rau hauv lub parison kom tshuab cov yas parison Nws nthuav thiab clings rau lub puab phab ntsa ntawm pwm, thiab tom qab txias thiab demolding, ntau yam hollow khoom yog tau.
Blister, lub tshuab ua cov yas yas, lub hauv paus ntsiab lus tseem ceeb yog kom sov lub tiaj tiaj tiaj cov ntawv nyuaj kom muag nws, tom qab ntawd siv lub tshuab nqus tsev nqus los nqus nws ntawm cov pwm, txias nws thiab tsim nws, thiab siv rau txhua qhov chaw ntawm lub neej.
Compression molding yog ib qho kev lag luam uas cov hmoov, granular los yog fiber ntau yas yog thawj zaug muab tso rau hauv pwm kab noj hniav ntawm molding kub, thiab tom qab ntawd cov pwm raug kaw thiab pressurized los tsim thiab solidify. Compression molding kuj tseem siv tau rau cov thermosetting plastics thiab thermoplastics Thiab cov ntaub ntawv roj hmab.
Ua npuas ncauj moulding yog txheej txheem ntawm kev ntxiv cov khoom tsim nyog foaming rau cov ntaub ntawv ua npuas ncauj (PVC, PE, PS, thiab lwm yam) kom cov yas tsim cov qauv microporous. Yuav luag tag nrho cov thermosetting thiab cov ntaub ntawv thermoplastic tuaj yeem ua rau hauv cov yas ua npuas ncauj, thiab ua npuas ncauj molding tau dhau los ua ib qho tseem ceeb hauv kev ua cov yas.
Pouring molding yog ib txoj hauv kev ua cov yas. Thaum ntxov casting, kua monomers los yog prepolymers tau txhaj rau hauv cov pwm nyob rau hauv ib txwm siab, thiab tom qab polymerization, lawv tau solidified thiab tsim rau hauv ib yam khoom uas zoo tib yam li cov kab noj hniav ntawm cov pwm. Nylon monomer casting tshwm sim hauv xyoo 1960. Saib polyamide. Nrog rau txoj kev loj hlob ntawm molding tshuab, cov tsoos casting tswvyim tau hloov. Polymer tov thiab dispersions xa mus rau polyvinyl chloride pastes thiab melts kuj siv tau rau casting.
Dripping yas thev naus laus zis siv cov ntaub ntawv thermoplastic polymer nrog cov khoom sib txawv hauv lub xeev, uas yog, lawv muaj cov kua dej khov nyob rau hauv qee qhov xwm txheej, thiab lawv tuaj yeem rov qab tau cov khoom ntawm chav sov, thiab siv cov txheej txheem tsim nyog thiab cov cuab yeej tshwj xeeb rau inkjet. Nyob rau hauv lub xeev ntawm viscous ntws, nws yog shaped mus rau hauv daim ntawv tsim raws li qhov yuav tsum tau, thiab ces solidified thiab zoo li tus ntawm chav tsev kub.
