Kuponya mchengandi njira yachikale komanso yamakono. Amagwiritsa ntchito mchenga wobiriwira (mchenga wonyowa) kapena mchenga wouma kupanga makina owumba. Kuponya mchenga wobiriwira ndi njira yakale kwambiri yoponyera yomwe imagwiritsidwa ntchito m'mbiri. Popanga nkhungu, mapangidwe opangidwa ndi matabwa kapena zitsulo ayenera kupangidwa kuti apange dzenje. Chitsulo chosungunulacho chimatsanulira mu mtsempha kuti apange zoponyera pambuyo pozizira ndi kulimba. Kuponya mchenga ndikotsika mtengo kuposa njira zina zopangira nkhungu komanso gawo loponyera ma unit. Mchenga kuponyera, nthawizonse zikutanthauza wobiriwira mchenga kuponyera (ngati palibe kufotokoza wapadera). Komabe, masiku ano, njira zina zoponyamo zimagwiritsanso ntchito mchenga kupanga nkhungu. Ali ndi mayina awoawo, mongachipolopolo nkhungu kuponyera, utomoni wa furan wokutira mchenga (palibe mtundu wophika),kutaya thovundi kuponya vacuum.
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