Kev Muaj Peev Xwm Cuam Tshuam cuam tshuam rau Ultrasonic vuam kev ua tau zoo ntawm cov khoom seem yas
Yas zog:
Cov plastics raug faib ua thermoset plastics thiab thermoplastics.
Thermoset plastics yog yas tab sis tsis ua haujlwm. Thaum rhuab thawj zaug, cov ndlwg tuaj yeem yaj, rhuab mus rau qhov ntsuas kub, thiab qhov tshwm sim tshuaj lom neeg tshwm sim. Tus ntoo khaub lig-txuas solidifies thiab hardens los tsim cov khoom tawv; tab sis qhov kev hloov no tsis tuaj yeem hloov pauv, thiab cov yas thermosetting tsis tuaj yeem yaj dua thaum rov kho dua. Yog li no, ultrasonic vuam tsis tuaj yeem txuas cov ntaub ntawv thermosetting.
Thermoplastics yog yas thiab thim rov qab. Thaum thawj lub tshav kub tsim cov khoom ua tau ruaj khov, nws cov qauv sab hauv tsuas yog hloov morphology thiab thim rov qab; thaum rov kho dua thiab nias siab, nws tuaj yeem kho dua ntxiv thiab ntxiv dag zog ntxiv. Ultrasonic vuam muaj peev xwm vuam feem ntau thermoplastics.
Thermoplastics tseem muab faib ntxiv rau hauv amorphous plastics thiab semi-crystalline plastics.
Vim yog qhov txawv cov qauv molecular thiab kev npaj ntawm ob, qhov ua haujlwm ultrasonic welding ntawm ob yog qhov sib txawv.
Tus qauv molecular ntawm amorphous plastics yog cia li faib, tsis muaj lub ntsiab lus meej melting Tm, uas maj mam muag, yaj thiab ntws dhau ntau qhov kub; tsis txhob yaj ntawm cov khib nyiab tam sim ntawd thaum tso cua sov mus rau ib qho kub, ces kho tam sim ntawd. Cov cuab yeej no ntawm amorphous plastics yog qhov yooj yim heev rau kev ua ultrasonic kev co thiab ua kom ultrasonic vuam hla ntau cov kev kub ntxhov thiab ntau yam.
Cov qauv molecular ntawm semi-crystalline plastics yog ib txwm muab faib nyob hauv zos, nrog qhov chaw ntshiab melting Tm. Cov yas siv roj hmab semi-crystalline tseem khov kho txog thaum kub txog rau lub ntsiab lus melting; thaum kub txog qhov chaw melting, tag nrho cov saw molecular pib txav tam sim ntawd thiab solidifies tam sim ntawd.Qhov sib txawv ntawm cov txheej txheem melting ntawm amorphous plastics thiab semi-crystalline plastics yog qhia hauv daim duab hauv qab no.
