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旧新闻纸(ONP)/旧杂志纸(OMG)的混合废纸和100%ONP的最新脱墨研究表明,常规碎浆所用的润湿时间短,不能有效弱化油墨-基质之间的结合力。如果在碎浆之前纸张润湿足够长时间,就可以获得比常规碎浆更好的油墨分离效果。然而,当处理OMG废纸的时候,如超级压光纸(SC)和低定量涂布纸(LWC),预润湿条件如何影响油墨的分离和碎裂尚不清楚。该研究考察了SC和LWC碎浆之前,在没有机械作用的情况下进行预润湿时,预润湿时间、温度和化学环境对其浆料光学性能的影响。研究表明:(1)在常规碱性皂化学环境和低碱性皂化学环境下,不同预润湿时间(0～24 h)和不同温度(25～65℃)的情况下,SC浆料的研究结果支持早先的发现———碎浆之前采用常规脱墨药液润湿SC,可以改善油墨分离;SC预润湿时间越长,碎浆之后吸附的油墨量越低;(2)对于LWC,由于印刷在涂层上的油墨易于分离,因此,预润湿不能改善它的油墨脱除情况;(3)对于SC浆料和LWC浆料,有预润湿和没有预润湿处理这2种情况的油墨碎裂情况类似。
Recent research on deinking of old newsprint (ONP) / recycled magazine paper (OMG) mixed waste paper and 100% ONP showed that conventional rehydration used a short wetting time and did not effectively weaken the ink-matrix cohesion. If the paper is wetted long enough before shredding, a better ink separation than conventional shredding can be achieved. However, it is unclear how pre-wetting conditions affect ink separation and fragmentation when dealing with OMG wastepaper, such as supercalendered paper (SC) and low basis weight coated paper (LWC). The study examined the effect of prewetting time, temperature and chemical environment on the optical properties of slurries prior to SC and LWC pulping prior to pre-wetting without mechanical action. The results show that: (1) Under the conditions of conventional alkali soap chemical environment and low alkaline soap chemical environment, different pre-wetting time (0-24 h) and different temperature (25-65 ℃) The findings support earlier findings that wetting SC with conventional deinking chemicals prior to pulping can improve ink separation; the longer the SC pre-wetting time, the lower the amount of ink that is adsorbed after pulping; (2) For LWC , Pre-wetting does not improve its ink removal due to the ease of separation of the ink printed on the coating; (3) pre-wetting and pre-wetting of SC slurry and LWC slurry The situation of ink fragmentation is similar.