Chifukwa Chiyani Pali Mavuvu Popanga Zinthu Zopangidwa ndi Polyurethane Integral Skin Foam?

Popanga PU kudzipangira pawokha, pali zovuta zina monga: pinholes, thovu la mpweya, zipsera zouma, zinthu zochepa, zosagwirizana, kusweka bwino, kusiyana kwamitundu, zofewa, zolimba, zotulutsa ndi utoto sizimapopera bwino, etc. Kuchitika kwa chodabwitsa, tiyeni tikambirane za vuto ndi m'badwo wa thovu lero.

1. Nkhungu: Pamene kutentha kwa nkhungu sikuli kokwanira, sikufika kutentha komwe kumafunika kupanga mankhwala.Tsegulani nkhungu pa liwiro labwinobwino, ndipo ma thovu amatha kuchitika.Kwenikweni, pali zinthu zitatu zosiyana: nkhungu yachitsulo, nkhungu ya aluminiyamu, ndi nkhungu ya utomoni.Nkhungu, nkhungu zamkuwa, ndi mitundu ya FRP zazimiririka m'zaka zaposachedwa.
1) Magawo ena opanga amagwiritsa ntchito uvuni wamagetsi powotchera.
2) Ena amatenthedwa ndi madzi.
3) zambiri ndi kutentha kwa gasi.Kunena zoona:
A. Mtengo wa kutentha kwa magetsi ndi wokwera kwambiri.Ndizoyenera kupanga mosalekeza komanso kupanga kwakukulu, ndipo zimafunikira luso lapamwamba pantchito.
B. Kutentha kwa madzi, kosavuta, kosavuta komanso kosavuta kulamulira.
C. Kutentha kwa gasi sikoyenera.Zowombera moto ndizoletsedwa pamalo oyambira opangira, omwe ndi osatetezeka, owopsa komanso ovuta kuwawongolera.
Zitsulo zachitsulo ndi zitsulo za aluminiyamu ziyenera kukonzedwa kuti zitenthedwe panthawi yopangira.Zina zimakutidwa pamwamba, kenako zimakwiriridwa m'machubu a aluminiyamu kuti asamutse kutentha kudzera m'machubu a aluminiyamu.Ena kubowola mabowo molunjika pa nkhungu.Ndikuganiza kuti ndibwino kubowola mwachindunji.Zabwino, Kutentha ndikolunjika kwambiri.Ngati kutentha kwa nkhungu kuli kochepa, mavuvu a mpweya adzapangidwa, ndipo nthawi yochiritsa sikwanira.Ngati kutentha kwa nkhungu kuli kwakukulu kwambiri, mankhwalawa adzakhala otupa kwambiri, ndipo zimakhala zosavuta kusweka pamene nkhungu imatsegulidwa.Kupanga kosiyanasiyana kwa nkhungu, monga kufunikira kwa nkhungu yachitsulo ndi madigiri 45, mwina kufunikira kwa nkhungu ya utomoni ndi madigiri 40 okha, madzi akumwa a valve ya chitoliro chamadzi amatha kusinthidwa bwino kuti akwaniritse kuwongolera kutentha.Nthawi zambiri, kutentha kwa nkhungu kumakhala kochepa kwambiri pakupanga thovu lakhungu.

2.Kutha kwa nkhungu: zitsulo zina zimafunikira mpweya kuti zichepetse mapangidwe a mpweya.
A. Kuphulika kwa 1.0-1.5 mm mwachindunji pamwamba pa nkhungu ndibwino, ngati kuli kwakukulu, chilondacho chidzakhala chachikulu kwambiri pambuyo podulidwa.
B. Kutulutsa kozungulira kwa nkhungu kumatchedwa grooving.Mukhoza kugwiritsa ntchito tsamba, tsamba la macheka, kapena chopukusira, ziribe kanthu njira yomwe imagwiritsidwa ntchito, koma ziyenera kudziwidwa kuti pamene nthawi ya grooving ili pafupi ndi malo a mzere wolekanitsa, m'pofunika kusaya.Ngati mzere wolekanitsa uli wozama kwambiri, umagwirizana mwachindunji ndi maonekedwe a mankhwala, ndipo chilondacho chitatha kudula m'mphepete chidzakhala chachikulu kwambiri.Pamalo a dzenje lotulukira mpweya ndi polowera mpweya nthawi zambiri amayika nkhungu pa ngodya yotulutsa thovu, ndikutsimikizira malo abwino kwambiri a dzenje lolowera ndi polowera molingana ndi zomwe zapangidwa.Mfundo yake ndikutsegula mabowo ochepa otuluka ndi polowera momwe mungathere..Pamene mankhwala omwe ali ndi zofunikira kwambiri sangathe kukhala ndi mabowo otulutsira mpweya ndi ma grooves, mutagwedeza nkhungu, ikani ngodya yotulutsa thovu ndikumasula batani la nkhungu.Chithovu choyambirira chikafika m'mphepete mwa nkhungu, dinani mwachangu nkhunguyo.kufikira zotsatira zake.

3. Pamene malo opangira thovu a nkhungu siwoyenera, ma thovu a mpweya amathanso kupangidwa:
Ziumba zina zimakhala zafulati, zina zimakhala zopindika, ndipo zina zimafunika kugwedezeka pa madigiri 360.Payekha, ndikuganiza kuti pamwamba pa mankhwala ndi mosamalitsa lathyathyathya ndipo kumbuyo si okhwima.Mutha kugwedeza nkhungu mmbuyo ndi mtsogolo ndikuyiyika pamalo abwino kwambiri.Ngati pamwamba pa mankhwala si okhwima Zofunikira zokhwima zomwezo monga mbali yakumbuyo ziyenera kuganiziridwa panthawiyi, kugwedeza kwa 360-degree kwa nkhungu ndiko kugwedeza zinthu kumbuyo kwa mankhwala kuti achepetse kubadwa kwa thovu la mpweya.