Opanga ma board a SMC amalankhula za mawonekedwe a zida zotchinjiriza

①Mapulasitiki ambiri ndi opepuka, okhazikika pamankhwala, ndipo sachita dzimbiri;

②Kukana kwamphamvu kwabwino;

③Ili ndi kuwonekera bwino komanso kukana kuvala;

④Kutchinjiriza kwabwino komanso kutsika kwamafuta;

⑤ Maonekedwe ambiri, mtundu wabwino, mtengo wotsika mtengo;

⑥Mapulasitiki ambiri amakhala ndi kutentha kosasunthika, kuchuluka kwamafuta ochulukirapo komanso kosavuta kuyaka;

⑦ Kusakhazikika kwa dimensional ndikusintha kosavuta;

⑧Mapulasitiki ambiri amakhala ndi kutentha kochepa kwambiri ndipo amakhala osasunthika pakutentha kochepa;

⑨ Osavuta kukalamba;

⑩ Mapulasitiki ena amasungunuka mosavuta mu zosungunulira.

Pulasitiki akhoza kugawidwa m’magulu awiri: thermosetting ndi thermoplastic. Zakale sizingapangidwenso ndikugwiritsidwa ntchito, ndipo zotsirizirazi zikhoza kupangidwa mobwerezabwereza. Pali mitundu iwiri yamapangidwe a ma polima apulasitiki:

Yoyamba ndi mzere wa mzere, ndipo polima pawiri ndi dongosolo limeneli amatchedwa liniya polima pawiri;

Chachiwiri ndi mawonekedwe amtundu wa thupi, ndipo gulu la polima lomwe lili ndi dongosololi limatchedwa thupi la polymer compound.

Ma polima ena ali ndi maunyolo a nthambi, otchedwa ma polima a nthambi, omwe ndi amtundu wa mzere. Ngakhale ma polima ena ali ndi maulalo olumikizana pakati pa mamolekyu, amakhala osalumikizana pang’ono, omwe amatchedwa mawonekedwe a netiweki ndipo ndi a thupi. Zomanga ziwiri zosiyana, zosonyeza zinthu ziwiri zosiyana. Mapangidwe a mzere (kuphatikiza mawonekedwe a nthambi) ma polima ali ndi mawonekedwe a elasticity ndi pulasitiki chifukwa cha kukhalapo kwa mamolekyu odziyimira pawokha, omwe amatha kusungunuka muzosungunulira, amatha kusungunuka ndi kutentha, ndipo amakhala ndi kuuma pang’ono ndi kuphulika. Popeza palibe ma macromolecules odziimira okha, ma polima opangidwa ndi thupi alibe elasticity ndi pulasitiki, sangathe kusungunuka ndi kusungunuka, koma amatha kutupa, ndipo amakhala ndi kuuma kwakukulu ndi kuphulika. Pulasitiki ili ndi mitundu iwiri ya ma polima, ma thermoplastics opangidwa ndi ma polima am’mizere, ndi mapulasitiki a thermosetting opangidwa ndi ma polima ochulukirapo.