Zida za pulasitiki zimakhala zolimba kapena za elastomeric kutentha kwa firiji, ndipo zopangirazo zimatenthedwa panthawi yokonza kuti zikhale zamadzimadzi, zosungunuka.Pulasitiki imatha kugawidwa mu "thermoplastics" ndi "thermosets" malinga ndi mawonekedwe awo opangira.
"Thermoplastics" imatha kutenthedwa ndikupangidwa nthawi zambiri ndipo imatha kubwezeretsedwanso.Zimakhala zamadzimadzi ngati matope ndipo zimasungunuka pang'onopang'ono.Ma thermoplastics omwe amagwiritsidwa ntchito kwambiri ndi PE, PP, PVC, ABS, ndi zina zotero. Thermosets imalimba kosatha ikatenthedwa ndi kukhazikika.Unyolo wa molekyulu umapanga zomangira za mankhwala ndipo umakhala wosasunthika, motero ngakhale utatenthedwanso, sungathe kufika pamadzi osungunuka.Epoxies ndi rubbers ndi zitsanzo za mapulasitiki a thermoset.
Zotsatirazi ndi zina wamba mitundu ndi tsatanetsatane wa ndondomeko pulasitiki processing: pulasitiki kuponyera (dontho akamaumba, coagulation akamaumba, rotational akamaumba), kuwomba akamaumba, pulasitiki extrusion, pulasitiki thermoforming (compression akamaumba, vacuum kupanga), pulasitiki jekeseni akamaumba, pulasitiki kuwotcherera (kukangana kuwotcherera, kuwotcherera laser), thovu la pulasitiki
Nthawi yotumiza: May-25-2022