CN115110333B - 一种利用生物酶增强节能的全废纸牛皮卡纸生产方法 - Google Patents
一种利用生物酶增强节能的全废纸牛皮卡纸生产方法 Download PDFInfo
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Abstract
本发明公开了一种利用生物酶增强节能的全废纸牛皮卡纸生产方法,选择OCC为主要纤维原料,通过碎浆、高浓除渣、分级筛、低浓除渣、压力筛等处理,获得长纤维浆和短纤维浆,用短纤维抄制牛皮卡纸的底层,长纤维抄制牛皮卡纸的面层,并采用新型稀释水流浆箱,保证纸浆上网匀度,并通过优化压榨、干燥、表面施胶技术,确保全国废牛皮卡纸的强度性能。通过实验研究了碎浆疏解、纤维分级、生物酶复配与激活、生物酶辅助打浆与助滤等技术,结合浆内增强、浆内施胶和表面施胶,使纸页的紧度大于0.68g/cm3,横向环压指数达到6.5N·m/g以上,耐破指数达到2.0kPa·m2/g以上,耐折度达到12次以上,表面吸水性低于≤50g/m2。
Description
技术领域
本发明涉及造纸相关技术领域,具体而言涉及一种利用生物酶增强节能的全废纸牛皮卡纸生产方法。
背景技术
牛卡纸是一种以本色木浆及废纸制造的本色卡纸,牛卡纸的使用范围广泛,主要用于包装用纸。牛卡纸是电商纸箱最外面那层纸板(或叫箱纸板、面纸等),要求好的挺度,抗水性,它的生产技术相对于其他包装纸板来说比较高,主要是制浆、造纸流程比较复杂,产品的质量技术要求也较高。
近年来随着资源回收力度的不断加大,以及由于电商市场的迅猛发展使更多的包装材料在国内流通、回收,国产废纸的回收率也在不断提高。现有电子商务用纸箱的面纸一般都用废纸制造,多数情况存在挺度低、耐破性差、耐折度低等缺点。
现有技术中也有很多关于采用废纸生产牛皮卡纸的文献报道。如申请号为CN201810299551.0的发明专利中公开了一种利用国产废纸生产低克重高强度牛卡纸的方法,包括制浆步骤和抄纸步骤,是将国产废纸用分级筛分级后,将长纤维用于面层,短纤维用于底层;在底层浆中加入少量细木粉,提高了牛卡纸的挺度;在两层中间喷淋淀粉和CMC复配体系,提高了牛卡纸的层间结合力;浆内加淀粉和聚丙烯酰胺双元增强剂,提高了产品强度。另外,将浆内抗水和表面抗水结合,同时将浆内阻燃和层间阻燃技术综合,提高了牛卡纸产品抗水性的同时使产品达到了难燃效果。
又如申请号为CN202010587201.1的发明专利中公开了一种高性能环保牛皮箱纸板,包括从底至上依次设置的底层、面层和涂布层;其中:所述底层是由改性木粉浆和短纤维浆组成的底层浆制得;所述面层是由长纤维浆和短纤维浆组成的面层浆制得;所述涂布层是将阻燃苯丙胶乳涂布于面层上形成的;所述长纤维浆、短纤维浆是由国产旧瓦楞纸箱经制浆形成的;所述阻燃苯丙胶乳是由改性复合阻燃剂、功能化改性苯丙胶乳和水组成。
然而,上述现有技术中,对于牛皮卡纸的耐破指数、耐折度、环压指数等性能还不能很好的满足实际的使用需求;另外,生产过程中的单位能耗过高也一直是业内需要解决的问题。
发明内容
针对现有技术的不足,本发明的目的在于提供一种利用生物酶增强节能的全废纸牛皮卡纸生产方法。
本发明解决技术问题所采用的技术方案是:一种利用生物酶增强节能的全废纸牛皮卡纸生产方法,所述方法主要包括如下步骤:
S1、制浆步骤:将国产废纸经水力碎浆机碎解后,进行高浓除渣,然后经一级三段粗筛,再经分级筛分成长纤维和短纤维,长纤维先经一级三段除渣处理,除渣后的长纤维再分别依次经过一级三段精筛处理、多盘回收机浓缩处理、热分散处理、纤维素酶预处理、双盘磨浆机精磨处理后制得长纤维精浆贮存于长纤维成浆池中用于抄制牛皮卡纸面层;短纤维经一级二段精筛处理后,采用粘状打浆制得短纤维浆,贮存于短纤维成浆池中用于抄制牛皮卡纸底层;
S2、抄纸步骤:在所述长纤维成浆池中加入增强剂和施胶剂,在所述短纤维成浆池中加入复合增强剂和施胶剂;然后将长、短纤维浆料分别通过流送系统流送至稀释水流浆箱,经面网和底网滤水形成湿纸页,再经复合、压榨、前烘、表胶、后烘、压光、卷取得到牛皮卡纸。
进一步地,所述步骤S1中,碎浆浓度为4~8%,碎浆时间为10~30min,碎浆温度为20~40℃。更优选地,碎浆浓度6%,碎浆温度室温,碎浆时间为20min;此时浆中碎纸片含量约20%左右,由纤维分离机来完成后续的疏解任务。
进一步地,所述步骤S1中,所述分级筛选用波纹筛板的缝式纤维分级筛,所述分级筛的筛缝宽度为0.10~0.20mm,进浆浓度为1.0~1.5%,进浆压力为0.20~0.30MPa;调节出浆口,控制长、短纤维比例为52~73:27~48。更优选地,所述分级筛的筛缝宽度为0.15mm,进浆浓度为1.0~1.5%,进浆压力为0.25MPa;调节出浆口,控制长、短纤维比例为55~60:45~40。
废纸浆中既含有长纤维,也含有短纤维,若将长短纤维分开处理,更好地发挥长纤维原料的作用,这不仅可以节省设备投资,简化处理流程和节省动力消耗,同时也能满足纸页多层成形技术要求长短纤维分层成形的需要。碎浆和疏解后的OCC废纸浆中既含有一定量的长纤维和碎片,同时也含有相当数量的细小纤维和短纤维,经过碎浆机的筛板分离出来的细小纤维和短纤维还是比较清洁的,可以不经处理或简单处理用于造纸,但长纤维组分则需要进行一些必要的处理,如进行热分散以使纸页的表面匀整化,进行精浆处理以提高其结合强度。因此,废纸经碎解、疏解处理后,还需要进行分级处理,将长短纤维进行分级。分级后可获得较清洁的短纤维浆料,对长短纤维进行分开处理,短纤维不再进行耗能的热分散处理,可节省设备投资和能源。分级处理后可将长纤维组分和短纤维组分分别用于多层纸板的不同层次或用于生产不同的产品,如将长纤维用于牛皮卡纸的面层,短纤维用于底层,开发合理的长短纤维分层利用技术,实现全国废纤维的最优化利用。分级后可控制长纤维和短纤维组合的配比以保证产品质量的均匀性。
进一步地,所述步骤S1中,所述短纤维经一级二段精筛处理后,采用纤维素酶预处理。
进一步地,所述步骤S1中,所述长纤维经双盘磨浆机精磨处理后再进行纤维素酶后处理;所述短纤维经粘状打浆后再进行纤维素酶后处理。
进一步地,所述步骤S1中,所述长纤维浆料和/或所述短纤维浆料采用纤维素酶预处理或者纤维素酶后处理时,浆料pH控制在7~8,处理时间为30~45min。
进一步地,所述纤维素酶为中性纤维素酶、半纤维素酶中的一种或两种的组合;所述中性纤维素酶的用量为0~8U/g;所述半纤维素酶的用量为0~1.0AXU/g。
国产废纸往往经过多次循环使用,纤维较短且角质化程度高,纤维之间不能形成足够的结合强度,需要磨浆等机械处理方法以改善纤维之间的键合,赋予理想的纸张强度。但是常规的磨浆处理产生较多的细小纤维,影响纸浆的滤水性能,对成纸性能产生负面影响,同时能耗较高。利用纤维表面改性技术可以提高磨浆效率、提升纸浆强度性能。其中,生物酶改性处理可使废纸纤维细胞壁变得松弛,使细胞壁内部易分层或润胀,纤维素具有柔韧性。在磨浆过程中,纤维易分丝帚化,从而达到缩短磨浆时间和降低磨浆能耗的目的。除此之外,生物酶处理还可以改善纸浆的滤水性能,提高抄造脱水效率,节约能耗。纤维改性用生物酶主要是以纤维素酶、半纤维素酶或者纤维素酶和半纤维素酶的组合酶组成,它们分别作用于纤维素和半纤维素。不同种类的纸浆纤维的成纸性能存在着较大差异,不同的生物酶缺省组合对纤维表面改性也存在较大差异,因此,需要针对单组份生物酶处理和组合酶处理后的磨浆节能工艺进行应用研究。同时,由于生物酶的苛刻的作用条件和昂贵的价格,阻碍了生物酶在改性纤维领域的应用,因此通过添加生物酶促进剂以提高生物酶活性,或者添加表面活性剂以提高生物酶组分在纤维中的吸附和渗透,或者通过分离出多种互不相同的纤维素酶或者木聚糖酶基因,进而培养出渗透能力强的高效磨浆用生物酶等,具有相对重要的现实意义。
在打浆前用酶预处理废纸浆,可能降低打浆能耗,在相近的打浆度下,提高了纸浆的强度。发生这些变化的原因是酶作用于纤维表面,使纤维结构变得松弛,不需要剧烈的机械作用就能获得较好的细纤维化,从而发剪纸浆的性能。纸浆经过磨浆之后结合强度大幅提高,但是打浆度也随之提高,降低了纸浆的滤水性能。如果将已磨浆的浆料用酶进行后处理,可以改善纸浆的滤水性能。打浆之后酶处理还可在不恶化纸浆滤水性能的条件下提高废纸浆的结合强度。为了使纸浆具有较好的滤水性能,又具有较好的强度,可在磨浆前后都适当地进行酶处理。
进一步地,所述步骤S2中,在长纤维成浆池中加入改性淀粉或CPAM作为增强剂,加入AKD作为施胶剂;在短纤维成浆池中加入改性淀粉、聚丙烯酰胺、聚酰胺环氧氯丙烷作为复合增强剂,加入AKD作为施胶剂;所述增强剂或复合增强剂的用量为0.3~0.4%;所述施胶剂的用量为8.0kg/t纸。
进一步地,所述步骤S2中,所述压榨采用采用靴式压榨;所述表胶采用计量棒式膜转移表面施胶装置,采用表面施胶淀粉对牛皮卡纸表面进行施胶。
本发明的有益效果是:与现有技术相比,本发明提供的一种利用生物酶增强节能的全废纸牛皮卡纸生产方法,选择OCC为主要纤维原料,通过碎浆、高浓除渣、分级筛、低浓除渣、压力筛等处理,获得长纤维浆和短纤维浆,用短纤维抄制牛皮卡纸的底层,长纤维抄制牛皮卡纸的面层,并采用新型稀释水流浆箱,保证纸浆上网匀度,并通过优化压榨、干燥、表面施胶技术,确保全国废牛皮卡纸的强度性能。通过实验研究了碎浆疏解、纤维分级、生物酶复配与激活、生物酶辅助打浆与助滤等技术,结合浆内增强、浆内施胶和表面施胶,并进行多次工艺优化,综合研究了各工艺因素对纸页性能的影响。通过多次小试,使纸页的紧度大于0.68g/cm3,横向环压指数达到6.5N·m/g以上,耐破指数达到2.0kPa·m2/g以上,耐折度达到12次以上,表面吸水性低于≤50g/m2。
附图说明
图1为酶处理对还原糖释放量和纸浆粘度的影响。
图2为酶用量对OCC浆料打浆度的影响。
图3为酶用量对OCC浆料保水值的影响。
具体实施方式
下面通过具体实施例来进一步说明本发明。但这些实例仅用于说明本发明而不用于限制本发明的范围。
一种利用生物酶增强节能的全废纸牛皮卡纸生产方法,所述方法主要包括如下步骤:
S1、制浆步骤:将国产废纸经水力碎浆机碎解后,进行高浓除渣,然后经一级三段粗筛,再经分级筛分成长纤维和短纤维,长纤维先经一级三段除渣处理,除渣后的长纤维再分别依次经过一级三段精筛处理、多盘回收机浓缩处理、热分散处理、纤维素酶预处理、双盘磨浆机精磨处理后制得长纤维精浆贮存于长纤维成浆池中用于抄制牛皮卡纸面层;短纤维经一级二段精筛处理后,采用粘状打浆制得短纤维浆,贮存于短纤维成浆池中用于抄制牛皮卡纸底层;
S2、抄纸步骤:在所述长纤维成浆池中加入增强剂和施胶剂,在所述短纤维成浆池中加入复合增强剂和施胶剂;然后将长、短纤维浆料分别通过流送系统流送至稀释水流浆箱,经面网和底网滤水形成湿纸页,再经复合、压榨、前烘、表胶、后烘、压光、卷取得到牛皮卡纸。
所述步骤S1中,碎浆浓度6%,碎浆温度室温,碎浆时间为20min;此时浆中碎纸片含量约20%左右,由纤维分离机来完成后续的疏解任务。
所述步骤S1中,所述分级筛选用波纹筛板的缝式纤维分级筛,所述分级筛的筛缝宽度为0.15mm,进浆浓度为1.0~1.5%,进浆压力为0.25MPa;调节出浆口,控制长、短纤维比例为55:45。在另一个实施例中,所述步骤S1中,所述分级筛选用波纹筛板的缝式纤维分级筛,所述分级筛的筛缝宽度为0.15mm,进浆浓度为1.0~1.5%,进浆压力为0.25MPa;调节出浆口,控制长、短纤维比例为60:40。
所述步骤S1中,所述短纤维经一级二段精筛处理后,采用纤维素酶预处理。所述长纤维经双盘磨浆机精磨处理后再进行纤维素酶后处理;所述短纤维经粘状打浆后再进行纤维素酶后处理。所述步骤S1中,所述长纤维浆料和/或所述短纤维浆料采用纤维素酶预处理或者纤维素酶后处理时,浆料pH控制在7~8,处理时间为40min。
所述纤维素酶为中性纤维素酶、半纤维素酶中的一种或两种的组合;所述中性纤维素酶的用量为0~8U/g;所述半纤维素酶的用量为0~1.0AXU/g。
发明人对于不同用量和不同种类的酶对浆料的影响进行了详细的研究。
取一定量的OCC分级后得到的长纤维浆料置于锥形瓶中,加入一定量的中性纤维素酶,并用100ml pH为7的磷酸缓冲溶液和适量去离子水调节浆浓为4.5%,将其放入55℃的摇床里,在200rpm下反应2h。反应结束后,样品在100℃下加热10min使酶变性。然后通过过滤分离,并收集浆料和滤液。浆料用去离子水洗涤,并在4℃条件下贮存以备PFI磨浆使用。
酶对纤维的水解作用可通过定量释放到酶处理滤液中的还原糖及纤维素的粘度来分析,图1是酶处理2h后还原糖释放量和纸浆粘度随酶用量的变化情况。结果表明,当酶用量为8U/g,还原糖释放量为5mg/g,纸浆的水解率不超过0.5%,说明酶处理对纸浆的水解作用不明显。另外,纸浆粘度随着酶用量的增加而减小,酶用量为8U/g时,纸浆粘度下降了11.1%,说明纤维素酶对OCC浆纤维有降解作用。
酶处理前后OCC浆纤维形态指标见表1。与酶处理前比较,酶处理后的纤维长度(重均长度、数均长度)和纤维平均宽度并没有明显差异,纤维表面依旧完整。这是因为酶对纤维的水解程度小,反应温和。卷曲率和扭结纤维含量有所降低,这可能与纤维长度有关,长度越大的纤维越容易扭结和弯曲。另外,酶用量较低时,纤维素酶主要与细小纤维反应,使其水解,导致细小纤维含量有所减少。
表1酶处理后的纤维形态变化
由图2可知,在对OCC浆进行PFI磨浆过程中,在低磨浆转数下(2500r、5000r),酶预处理过的浆料明显比未经酶处理的浆料更容易打浆,且打浆度也随酶用量增加而提高。说明酶处理可以增强打浆过程中的纤维润胀、切断以及细纤维化程度。当打浆度达到50°SR时,酶用量为0U/g和8U/g的浆料分别需要磨浆5000r和2500r,即酶预处理可节约磨浆能耗50%;而当打浆度达到68°SR时,酶用量为0U/g和8U/g的浆料分别需要磨浆7500r和5000r,酶预处理可节能33.3%。而当高打浆转数下(7500r、10000r),酶处理的浆料与未用酶处理的浆料的打浆度并没有明显差异,到10000r使打浆度几乎一样。这说明酶促打浆只在一定打浆度范围中有较好的效果,超出范围酶促打浆就不会产生明显的节能效果,这主要由于纤维表面帚化和细小纤维含量影响着打浆度的变化,在到达一定磨浆转数,纤维表面帚化和细纤维化没有明显变化,使得打浆度上升趋势趋于平缓。
由图3可知,酶预处理对初始OCC浆料的保水值影响不大,这是因为所用酶对纤维的水解程度较小。而经过相同磨浆转数(2500r、5000r)的打浆作用下,浆料的保水值随着酶用量的增加而增大,说明酶处理能一定程度上提高纤维在打浆过程的润胀和细纤维化程度,但是增幅较小。酶用量8U/g、磨浆5000r的浆料保水值比未经酶预处理的浆料仅提高了19.5%。
由表2可知,随着酶用量的增加,纤维数均长度、重均长度、扭结纤维含量和卷曲率都越来越小,细小纤维含量则不断增大,平均宽度略微增大(纤维润胀而导致纤维宽度增大)。酶用量8U/g、磨浆5000r的浆料较酶用量0U/g、磨浆5000r的浆料纤维数均长度和重均长度分别降低了40.6%和46.6%,扭结纤维含量和卷曲率分别降低了26.6%和6.5%,细小纤维含量则增加了21.8%,即酶促打浆使得更多纤维被切断、细纤维化。
表2酶预处理后磨浆5000r的纤维形态参数
选择了一种半纤维素酶Pulpzym HC处理OCC浆料,研究了其用量对打浆度及强度的影响,见表3。结果显示,酶用量在0-0.8AXU/g区间内浆料打浆度均低于空白浆,而在区间0.2-1.0AXU/g内随着酶用量的增加打浆度反而上升。酶处理后的浆料,其环压指数、撕裂指数、耐破指数都变化不大,或略有提升。
表3半纤维素酶处理后OCC纸浆强度性质的变化
研究了复合酶对OCC浆打浆度与强度的影响,采用纤维素酶(Genencor酶制剂公司的Optimase CX55L)与Pulpzym HC半纤维素酶按一定比例混合处理纸浆,结果如表4所示。
表4不同复合酶配比处理下纸浆的强度性质
在纤维素酶用量一定的条件下,纸浆的环压及耐破指数均随半纤维素酶用量的增大而增大,当中性纤维素酶用量为2IU/g时,两种强度指数均高于纤维素酶用量为4IU/g时的强度指数。综合考虑打浆度的影响,生产中可采用中性纤维素酶用量为2IU/g、半纤维素酶用量为0.4AXU/g进行复合生物酶处理。
在磨浆之前进行酶预处理,在同样的磨浆条件下会提高纸浆的强度,如表5所示。可看出,酶处理促进了打浆作用,在同样磨浆条件下提高了废纸浆的打浆度和耐破度、裂断长等强度指标。
表5磨浆之前加入纤维素酶预处理对强度的影响
磨浆之前进行酶预处理,在相同打浆度下,可能降低打浆的能耗,或在相同磨浆能耗下提高打浆度,如表6所示。
表6磨浆之前加入纤维素酶预处理对磨浆能耗和浆料滤水性的影响
可见,在打浆前用酶预处理废纸浆,可能降低打浆能耗,在相近的打浆度下,提高了纸浆的强度。发生这些变化的原因是酶作用于纤维表面,使纤维结构变得松弛,不需要剧烈的机械作用就能获得较好的细纤维化,从而发剪纸浆的性能。
纸浆经过磨浆之后结合强度大幅提高,但是打浆度也随之提高,降低了纸浆的滤水性能。如果将已磨浆的浆料用酶进行处理,可以改善纸浆的滤水性能。打浆之后酶处理还可在不恶化纸浆滤水性能的条件下提高废纸浆的结合强度。如表7所示。
表7磨浆之后加入纤维素酶预处理对磨浆能耗和浆料滤水性的影响
所述步骤S2中,在长纤维成浆池中加入改性淀粉或CPAM作为增强剂,加入AKD作为施胶剂;在短纤维成浆池中加入改性淀粉、聚丙烯酰胺、聚酰胺环氧氯丙烷作为复合增强剂,加入AKD作为施胶剂;所述增强剂或复合增强剂的用量为0.3~0.4%;所述施胶剂的用量为8.0kg/t纸。
所述步骤S2中,所述压榨采用采用靴式压榨;所述表胶采用计量棒式膜转移表面施胶装置,采用表面施胶淀粉对牛皮卡纸表面进行施胶。
实施例1
(1)制浆步骤:将国产废纸经水力碎浆机碎解后,进行高浓除渣,然后经一级三段粗筛,再经分级筛分成长纤维和短纤维,长纤维先经一级三段除渣处理,除渣后的长纤维再分别依次经过一级三段精筛处理、多盘回收机浓缩处理、热分散处理、纤维素酶预处理、双盘磨浆机精磨处理后制得长纤维精浆贮存于成浆池中用于抄制牛皮卡纸面层;短纤维经一级二段精筛处理后,再用双盘磨浆机轻微打浆处理制得短纤维浆,贮存于短纤维成浆池中用于抄制牛皮卡纸底层。
制浆工艺:碎浆浓度:6%,碎浆时间:20min,碎浆温度:常温;纤维分级筛缝宽为0.15mm,调节出浆口,控制长短纤维比例在60:40;将长纤维组分经过热分散处理后采用中性纤维素酶进行预处理,酶用量0.05%,浆料pH控制在7-8,预处理时间40min;酶预处理后的长纤维浆料进行打浆处理后备用;短纤维组分经轻微磨浆后备用。
(2)抄纸步骤:在长纤维成浆池中加入改性淀粉、CPAM、AKD等增强和施胶剂,在短纤维成浆池中加入改性淀粉、聚丙烯酰胺、聚酰胺环氧氯丙烷等复合增强剂及AKD施胶剂等。助剂用量:AKD施胶剂:8.0kg/t纸;增强剂用量:0.3%。然后将长短纤维浆料分别通过流送系统流送至稀释水流浆箱,经面网和底网滤水形成湿纸页,再经复合、压榨、前烘、表胶、后烘、压光、卷取得到牛皮卡纸。
经检测,成纸的主要技术指标如表8所示。
表8实施例1纸样的测试指标
实施例2
与实施例1相比,调整分级筛出浆量,控制长短纤维比例为55:45,对短纤维也采用了中性纤维素酶进行预处理,然后采用粘状打浆,减少切断,保证了纤维的长度;同时将CS、CPAM等复合增强剂的配方进一步优化,并适当增加增强剂的用量至0.4%,以提高纸页强度;其它工艺和流程同实施例1,制得的牛皮卡纸经检测,成纸的主要技术指标如表9所示。
表9实施例2纸样的测试指标
从数据上看,通过优化碎浆工艺、纤维分级工艺、生物酶辅助打浆工艺处理,再通过浆内施胶、增强剂复配使用及分级分层成形的优化使用,用全废纸生产的牛皮卡纸完全能够达到技术指标要求。
以上实施方式仅用于说明本发明,而并非对本发明的限制,有关技术领域的普通技术人员,在不脱离本发明的精神和范围的情况下,还可以做出各种变化和变型,因此所有等同的技术方案也属于本发明的范畴,本发明的专利保护范围应由权利要求限定。
Claims (1)
1.一种利用生物酶增强节能的全废纸牛皮卡纸生产方法,其特征在于:所述方法主要包括如下步骤:
S1、制浆步骤:将国产废纸经水力碎浆机碎解后,进行高浓除渣,然后经一级三段粗筛,再经分级筛分成长纤维和短纤维,长纤维先经一级三段除渣处理,除渣后的长纤维再分别依次经过一级三段精筛处理、多盘回收机浓缩处理、热分散处理、纤维素酶预处理、双盘磨浆机精磨处理后制得长纤维精浆贮存于长纤维成浆池中用于抄制牛皮卡纸面层;短纤维经一级二段精筛处理后,采用粘状打浆制得短纤维浆,贮存于短纤维成浆池中用于抄制牛皮卡纸底层;所述步骤S1中,碎浆浓度为4~8%,碎浆时间为10~30min,碎浆温度为20~40℃;
S2、抄纸步骤:在所述长纤维成浆池中加入增强剂和施胶剂,在所述短纤维成浆池中加入复合增强剂和施胶剂;然后将长、短纤维浆料分别通过流送系统流送至稀释水流浆箱,经面网和底网滤水形成湿纸页,再经复合、压榨、前烘、表胶、后烘、压光、卷取得到牛皮卡纸;
所述步骤S1中,所述分级筛选用波纹筛板的缝式纤维分级筛,所述分级筛的筛缝宽度为0.10~0.20mm,进浆浓度为1.0~1.5%,进浆压力为0.20~0.30MPa;调节出浆口,控制长、短纤维比例为52~73:27~48;所述短纤维经一级二段精筛处理后,采用纤维素酶预处理;所述长纤维经双盘磨浆机精磨处理后再进行纤维素酶后处理;所述短纤维经粘状打浆后再进行纤维素酶后处理;所述长纤维浆料和所述短纤维浆料采用纤维素酶预处理和纤维素酶后处理时,浆料pH控制在7~8,处理时间为30~45min;所述纤维素酶为中性纤维素酶、半纤维素酶的组合;所述中性纤维素酶的用量为2IU/g;所述半纤维素酶的用量为0.4AXU/g;所述步骤S2中,在长纤维成浆池中加入改性淀粉或CPAM作为增强剂,加入AKD作为施胶剂;在短纤维成浆池中加入改性淀粉、聚丙烯酰胺、聚酰胺环氧氯丙烷作为复合增强剂,加入AKD作为施胶剂;所述增强剂或复合增强剂的用量为0.3~0.4%;所述施胶剂的用量为8.0kg/t纸;所述步骤S2中,所述压榨采用靴式压榨;所述表胶采用计量棒式膜转移表面施胶装置,采用表面施胶淀粉对牛皮卡纸表面进行施胶。
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