Momwe mungapewere cavitation mumakina opangira thovu a polyurethane
1. Yang'anirani mwamphamvu chiŵerengero ndi kuchuluka kwa jekeseni wa yankho loyambirira
Kuwongolera chiŵerengero cha zinthu zakuda, kuphatikiza polyether ndi cyclopentane.Pansi pa chikhalidwe chakuti kuchuluka kwa jekeseni kumakhalabe kosasinthika, ngati chiwerengero cha zinthu zakuda ndi chachikulu kwambiri, cavitation idzawonekera, ngati gawo la zinthu zoyera ndi lalikulu kwambiri, ming'oma yofewa idzawoneka, ngati gawo la cyclopentane ndi lalikulu kwambiri, thovu. zidzawoneka, ndipo ngati gawolo ndi laling'ono kwambiri, cavitation idzawonekera.Ngati chiwerengero cha zipangizo zakuda ndi zoyera sichikuyenda bwino, padzakhala kusakanikirana kosagwirizana ndi kuchepa kwa thovu.

Kuchuluka kwa jekeseni kuyenera kutengera zofunikira za ndondomeko.Kuchuluka kwa jakisoni kukakhala kotsika kuposa momwe zimafunikira, kachulukidwe ka thovu kamakhala kochepa, mphamvu imakhala yochepa, ndipo ngakhale chodabwitsa chodzaza ma vacuoles osakanikirana chidzachitika.Pamene jekeseni voliyumu ndi apamwamba kuposa ndondomeko zofunika, padzakhala kuwira kufalikira ndi kutayikira, ndipo bokosi (khomo) adzakhala wopunduka.
2. Kuwongolera kutentha kwamakina opangira thovu a polyurethanendiye chinsinsi chothetsera cavitation
Kutentha kukakhala kokwera kwambiri, zochita zake zimakhala zachiwawa komanso zovuta kuzilamulira.N'zosavuta kuoneka kuti ntchito ya kuwira madzi jekeseni mu lalikulu bokosi si yunifolomu.The kuwira madzi jekeseni pa chiyambi wadutsa mankhwala anachita, ndi mamasukidwe akayendedwe ukuwonjezeka mofulumira, ndi kuwira madzi jekeseni kenako sanachite.Chifukwa, ndi kuwira madzi jekeseni kenako sangathe kukankhira kuwira madzi jekeseni woyamba kutsogolo mapeto a thovu ndondomeko ya bokosi, chifukwa m`deralo cavitation mu bokosi.
Zida zakuda ndi zoyera ziyenera kusungidwa kutentha kosalekeza musanachite thovu, ndipo kutentha kwa thovu kuyenera kuyendetsedwa pa 18 ~ 25 ℃.Kutentha kwa ng'anjo preheating zipangizo thovu ayenera kulamulidwa pa 30 ~ 50 ℃, ndi kutentha nkhungu thobvu ayenera kulamulidwa pakati pa 35 ~ 45 ℃
Pamene kutentha kwa nkhungu yotulutsa thobvu kumakhala kochepa kwambiri, madzi amadzimadzi amadzimadzi amadzimadzi ndi osauka, nthawi yochiritsa ndi yaitali, zomwe sizili zangwiro, ndipo cavitation imachitika;pamene kutentha kwa nkhungu yotulutsa thovu ndipamwamba kwambiri, pulasitiki ya pulasitiki imapunduka chifukwa cha kutentha, ndipo dongosolo la thovu lamadzimadzi limachita mwamphamvu.Choncho, kutentha kwa nkhungu yotulutsa thobvu ndi kutentha kwapakati pa ng'anjo yotulutsa thobvu kuyenera kuyendetsedwa mosamalitsa.
Makamaka m'nyengo yozizira, nkhungu yotulutsa thovu, ng'anjo yoyaka moto, ng'anjo yamoto, bokosi ndi chitseko ziyenera kutenthedwa kwa mphindi 30 m'mawa uliwonse pamene mzere watsegulidwa.Pambuyo pochita thovu kwa nthawi yotentha, chithovu chiyenera kuchepetsedwa.

Kuwongolera Kupanikizika kwa Makina Otsitsa a Polyurethane
Kupanikizika kwa makina otulutsa thovu ndikotsika kwambiri.Zinthu zakuda, zoyera ndi cyclopentane sizimasakanikirana mofanana, zomwe zimawonetsedwa ngati kusagwirizana kwa thovu la polyurethane, thovu lalikulu la m'deralo, kuphulika kwa thovu, ndi chithovu chofewa chapafupi: mikwingwirima yoyera, yachikasu kapena yakuda imawonekera pa thovu , chithovucho chinagwa.Kuthamanga kwa jakisoni wamakina otulutsa thovu ndi 13 ~ 16MPa