Tsarin bleaching na asali na ECF na chlorine don ƙwayar 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 adadin 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%.

Tsuntsayen ɓangaren litattafan almara na bamboo ɗinmu duk an goge su da ECF (kyauta na chlorine), wanda ke da ƙarancin asarar bleaching akan ɓangaren bamboo da ɗan ɗanƙon ɓangaren litattafan almara, gabaɗaya ya kai sama da 800ml/g. ECF bleached bamboo tissues suna da mafi kyawun ɓangaren litattafan almara, suna amfani da ƙarancin sinadarai, kuma suna da ingantaccen aikin bleaching. A lokaci guda, tsarin kayan aiki ya balaga kuma aikin aiki yana da kwanciyar hankali.

Matakan aikin ECF na bleaching-free bleaching na bamboo kyallen takarda sune: na farko, ana shigar da iskar oxygen (02) a cikin hasumiya na iskar oxygen don lalata iskar oxygen, sannan D0 bleaching-washing-Eop cirewa-washing-D1 bleaching-washing ana aiwatar da shi a jere bayan wankewa. Babban sinadaran bleaching sune CI02 (chlorine dioxide), NaOH (sodium hydroxide), H202 (hydrogen peroxide), da sauransu. A ƙarshe, ɓangaren litattafan almara yana samuwa ta hanyar rashin ruwa. Farin naman bamboo mai bleaked na iya kaiwa sama da 80%.