Tsarin yin bleaching na ECF ba tare da chlorine ba don nama na bamboo

Muna da dogon tarihi na yin takardan bamboo a kasar Sin. Tsarin zaren bamboo da kuma sinadaran da ke cikinsa na musamman ne. Matsakaicin tsawon zaren yana da tsayi, kuma tsarin bangon zaren na musamman ne. Aikin ci gaban ƙarfi yayin bulbula yana da kyau, yana ba wa ɓawon da aka yi bleach kyawawan halaye na gani na babban haske da kuma yawan watsa haske. Yawan lignin na kayan bamboo (kimanin 23%-32%) yana da yawa, wanda ke ƙayyade yawan alkali da matakin sulfidation yayin bulbula da girki (matsayin sulfidation gabaɗaya shine 20%-25%), wanda yake kusa da itacen coniferous. Babban abun ciki na hemicellulose da silicon na kayan kuma yana kawo wasu matsaloli ga aikin wanke ɓawon da tsarin fitar da ɓawon da kuma tattara kayan maye na baƙi. Duk da haka, kayan bamboo har yanzu suna da kyau wajen yin takarda.

Tsarin bleaching na manyan da matsakaitan masana'antun bleaching na bamboo zai yi amfani da tsarin bleaching na TCF ko ECF. Gabaɗaya, tare da zurfafa bleaching da kuma rage iskar oxygen na bleaching, ana amfani da fasahar bleaching ta TCF ko ECF. Dangane da adadin matakan bleaching, ana iya bleaching na bamboo zuwa haske na 88%-90%.

An yi wa kyallen bamboo ɗinmu da aka yi wa bleach da ECF (ba shi da sinadarin chlorine), wanda ke da ƙarancin asarar bleach a kan ɓawon bamboo da kuma ɗanko mai yawa, gabaɗaya yana kaiwa fiye da 800ml/g. Ƙwayoyin bamboo da aka yi wa bleach da ECF suna da ingancin ɓawon bamboo mafi kyau, suna amfani da sinadarai kaɗan, kuma suna da ingantaccen bleach mai yawa. A lokaci guda, tsarin kayan aiki ya tsufa kuma aikin aiki yana da ƙarfi.

Matakan aiwatar da bleaching na kyallen bamboo marasa sinadarin chlorine na ECF sune: da farko, ana shigar da iskar oxygen (02) cikin hasumiyar oxidation don cire oxidative, sannan ana gudanar da D0 bleaching-washing-Eop extraction-washing-D1 bleaching-washing a jere bayan an wanke. Manyan sinadaran bleaching sune CI02 (chlorine dioxide), NaOH (sodium hydroxide), H202 (hydrogen peroxide), da sauransu. A ƙarshe, bleaching ɗin yana samuwa ne ta hanyar bushewar matsin lamba. Farin kyallen bamboo da aka yi bleaching zai iya kaiwa sama da kashi 80%.