Mitundu wamba ndi kuyambitsa pulasitiki.

Pulasitiki, ndiye kuti, mphira wapulasitiki, ndi mphira wa mphira wopangidwa ndi polymerization wa zinthu zoyenga zamafuta ndi zinthu zina zamakemikolo.Amakonzedwa ndi opanga kupanga zinthu zapulasitiki zamitundu yosiyanasiyana.

1. Gulu la mapulasitiki: Pambuyo pokonza ndi kutentha, mapulasitiki akhoza kugawidwa m'magulu awiri: thermoplastic ndi thermosetting.Zodziwika bwino ndi izi:
1) PVC-polyvinyl kolorayidi
2) PE—polyethylene, HDPE—polyethylene yapamwamba kwambiri, LDPE—polyethylene yotsika kwambiri
3) PP-Polypropylene
4) PS-polystyrene
5) Zida zina zosindikizira ndi PC, PT, PET, EVA, PU, ​​KOP, Tedolon, etc.

2. Njira yosavuta yozindikiritsira mitundu yosiyanasiyana ya mapulasitiki:
Kusiyanitsa malinga ndi maonekedwe:
1) tepi ya PVC ndi yofewa ndipo imakhala yabwino kwambiri.Kuphatikiza apo, palinso zida zolimba kapena thovu, monga mapaipi amadzi, zitseko zolowera, ndi zina.
2) PS, ABS, mawonekedwe ofewa komanso osasunthika, nthawi zambiri amapangidwira jekeseni.
3) HDPE mu PE ndi yopepuka, yowoneka bwino komanso yowoneka bwino, pomwe LDPE ndi ductile pang'ono.
4) PP ili ndi kuwonekera kwinakwake ndipo ndi yolimba.

Siyanitsa molingana ndi mankhwala:
1) PS, PC ndi ABS zitha kusungunuka mu toluene kuti ziwononge malo awo.
2) PVC sichisungunuka ndi benzene, koma imatha kusungunuka ndi ketone zosungunulira.
3) PP ndi PE ali ndi kukana kwa alkali wabwino komanso kukana kwambiri zosungunulira.

Kusiyanitsa molingana ndi kuyaka:
1) PVC ikatenthedwa ndi moto, imawola fungo la chlorine, ndipo moto ukangochoka, sudzayaka.
2) PE idzatulutsa fungo la waxy pamene ikuyaka, ndi madontho a waxy, koma PP sadzatero, ndipo onse awiri adzapitiriza kuyaka atasiya moto.

3. Makhalidwe a mapulasitiki osiyanasiyana
1) Makhalidwe a PP: Ngakhale PP ili ndi kuwonekera, mawonekedwe ake ndi osavuta kusweka, omwe ndi abwino kulongedza chakudya.Zogulitsa zosiyanasiyana zimatha kupangidwa ndikuwongolera kuwonongeka kwawo kwa fracture.Mwachitsanzo: OPP ndi PP amawonjezeredwa mwauniaxially kuti apititse patsogolo mphamvu zawo, zomwe zimagwiritsidwa ntchito mofala pakupakira kunja kwa matawulo amapepala ndi timitengo.
2) Makhalidwe a PE: PE imapangidwa ndi ethylene.Kuchulukana kwa LDPE ndi pafupifupi 0.910 g/cm-0.940 g/cm.Chifukwa cha kulimba kwake kwakukulu komanso mphamvu yoteteza chinyezi, nthawi zambiri imagwiritsidwa ntchito popanga zakudya, zodzikongoletsera, ndi zina zotero;Kuchulukana kwa HDPE ndi pafupifupi 0.941 g/cm kapena kupitilira apo.Chifukwa cha kuwala kwake komanso kukana kutentha, nthawi zambiri amagwiritsidwa ntchito m'zikwama zam'manja ndi zikwama zosiyanasiyana zosavuta.