Nthowa ya Prepolymer:
Nthowa yakupangira thovu la prepolymer yikukhwaskana na kunozga dankha prepolymer kufuma ku (chigaŵa chituŵa) na (chigaŵa chifipa). Kufuma apo, maji, catalyst, surfactant, na vinyake vyakusazgapo vikusazgikira ku prepolymer na kusakanizgika pasi pa kusunkhunya kwaluŵiro kuti vipangiske thovu. Pamanyuma pa kuchizga, ŵakuwucekura pa nyengo yinyake yakutenthemera.
Nthowa ya Semi-Yakupangira Polima:
Nthowa yakupangira thovu ya semi - prepolymer yikukhwaskana na kunozga dankha prepolymer kufuma ku chigaŵa cha polyether polyol (chigaŵa chituŵa) na diisocyanate (chigaŵa chifipa). Kufuma apo, chigaŵa chakukhalira cha polyether panji polyester polyol, diisocyanate, maji, vyakupangiska kuti vinthu viŵeko, vyakupangiska kuti vinthu viŵe pa mtunda, na vinyake vikusazgikirapo na kusakanizgika pasi pa kusunkhunya mwaluŵiro kuti vipangiske thovu.
Nthowa yimoza yakupangira thovu:
Mu ndondomeko iyi, polyether panji polyester polyol (chigaŵa chituŵa) na polyisocyanate (chigaŵa chifipa), maji, chinthu icho chikupangiska kuti vinthu viŵeko, chinthu icho chikupangiska kuti vinthu viŵeko, chinthu icho chikupangiska kuti thupi liŵe na thovu, na vinyake vikusazgikira mu sitepe yimoza na kusakanizgika pasi pa kukhweŵa kwaluŵiro chomene pambere vindapangike thovu.
Nthowa yimoza yakupangira thovu ndiyo yikugwiriskirika nchito chomene. Nthowa yinyake njakuti ŵapangire thovu na mawoko, ndipo iyi njipusu chomene. Mupimire makora vinthu vyose vyakupangira, viŵikeni mu chiŵiya, ndipo nyengo yeneyiyo visakanizge makora. Kufuma apo, muthire chisakanizgo ichi mu nkhungu panji malo agho pakukhumbikwira kuzuzgika na pulasitiki wa thovu. Ziŵani kuti: Para mukupima, wonani kuti mwasazgapo polyisocyanate (chigaŵa chifipa) paumaliro.
Kanandi thovu la polyurethane lakukhora likupangika pa msinkhu wa chipinda, ndipo nthowa yakupangira thovu njambura kusuzga. Kulingana na umo makina ghakupangikira pakuzenga, lingagaŵika mu kupanga thovu la mawoko na kupanga thovu la makina; kulingana na kupanikizika pa nyengo ya kupanga thovu, lingagaŵika mu kupanikizika kwapachanya-kupanga thovu na kupanikizika kwakuchepa-; kulingana na nthowa yakuwumba, yingagaŵika mu kuponya thovu na kupopera thovu.