Utoto ndi organic pawiri, nthawi zambiri pamaso pa zinthu zamadzimadzi kuti amalize mankhwala anachita, kotero dziko loyamba kupanga utoto woyamba kugulitsidwa mu mawonekedwe amadzimadzi, ndithudi, choyambirira utoto khalidwe ndi chiŵerengero panopa ali kutali, akhoza kokha. kuonedwa ngati mtundu woyambirira wa utoto wamadzimadzi masiku ano.Panthawiyo, pafupifupi 20% ya zinthuzo zinali zamadzimadzi, ndipo utoto wamadzimadziwu unali makamaka utoto wa VAT ndi utoto wa mordant.

Mu 1923, anthu a ku Britain anawonjezera zina zowonjezera ku utoto woyambirira ndipo atatha kupeta, adapanga utoto wosasunthika wa disperse aqueous dispersion.

Malinga ndi zolemba za 1924, panthawiyo pafupifupi 80% ya utoto wopangira utoto kukhala ufa wabwino, utoto wa VAT wapangidwa kukhala magawo osiyanasiyana a tinthu tating'onoting'ono, kuchokera ku zinthu zabwino kwambiri mpaka 50um zopangira utoto. fumbi lalikulu komanso kusanyowa bwino.

Pambuyo pa 1930, utoto wamtundu wa dispersion udapangidwanso, komabe pali zofooka zina monga mvula yosavuta komanso kusakhazikika kosungirako.

Tsopano utoto wamadzimadzi utatha kukhathamiritsa pokonza zinthu zosiyanasiyana zakhala bwino kwambiri, nthawi yosungira imatha kufikira theka la chaka popanda kuwonongeka, mtengo wopangira utoto wamadzimadzi ndi wotsika, wosavuta kugwiritsa ntchito ndipo wakhala ukupangidwa nthawi zonse.

Kuyambira 1950, zikamera wa mchenga makina kwalimbikitsa chitukuko cha pambuyo mankhwala. Kupukuta konyowa ndi makina a mchenga kumatha kupeza tinthu tating'onoting'ono komanso tocheperako. Kuphatikiza apo, mawonekedwe opangirawo adasinthidwa kuti tinthu tating'onoting'ono ta utoto tifikire pafupifupi 1um, ndipo mtundu wazinthu zopangidwa ndi njira yatsopanoyi ndi zida zidakula kwambiri. ndi kukonza utoto wosasungunuka kunapita patsogolo kwambiri.

Ndikupita patsogolo kwa makina opangira mankhwala ndi zida zamankhwala, utoto wa granular unayamba kuwonekera. Utoto wa granular wowoneka ngati granularity wa 100 ~ 300 um, uli ndi tinthu tating'onoting'ono tilinso ndi tinthu tating'onoting'ono, madzi ake ndi abwino kuposa utoto waufa, kunyowa, kubalalitsidwa, komanso kugonjetsa. kubweza kwa fumbi laufa kuyandama kumwamba, mafomu a mlingo adawoneka nthawi yomweyo adalandiridwa ndi dipatimenti yopanga ndikugwiritsa ntchito, tsopano utoto wambiri udasinthidwa kukhala zinthu za granular.