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首页> 外文学位 >Strength-enhancing effects of combined treatments of industrial refining, cationic starch and dynamic nip wet-pressing on commercial pulp furnishes.
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Strength-enhancing effects of combined treatments of industrial refining, cationic starch and dynamic nip wet-pressing on commercial pulp furnishes.

机译：工业精制，阳离子淀粉和动态压区湿法联合处理对商业纸浆配料的强度增强效果。

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Commercial pulp furnishes were treated with three strength-enhancing technologies: industrial refining, dry strength additives and dynamic nip wet-pressing. One papermaking problem is that the potential synergistic or antagonistic combination effects of these three technologies on the xy-plane and z-directional paper sheet strength are unknown. This investigation also evaluated the industrial Brecht-Siewert specific edge load (SEL) refining theory for two sources of softwood kraft fibers: recycled old corrugated container (OCC) and Northeast bleached softwood kraft (BSK) fibers. The bleached fibers were mixed with mechanical pulp or Eucalyptus fibers and filler. Cationic starch was added to the pulp furnishes to mimic linerboard, a lightweight coated (LWC) base paper, a copy base paper and a pure softwood paper. A pilot plant papermachine press was used to densify the handsheets.; As freeness level drops below 400 ml CSF for the OCC furnishes the interactions between starch and refining increase, meaning all the strength values are dependent on starch dosage level and freeness level. A minimum of 2% starch (30% concentration) provided enough additional hydrogen bonding sites to improve strength significantly in the xy-plane and the sheet z-direction. An optimum 1.5 J/m refining intensity was applied.; For the BSK no interactive combination effects between the three applied strength enhancing technologies were found for tensile strength. However, increased starch dosage, press nip pressure and SEL caused a synergistic z-directional strength combination effect change for the LWC sheets. The main antagonistic combination effect was the loss of tear strength for the LWC sheet when starch and press nip pressure were increased.; Optimum tensile strength values required different J/m refining intensities for the different pulp furnishes. One J/m refining intensity was the best condition for optimizing tear strength of the LWC base sheet; while two J/m refining intensity was the optimum for developing strength values in the xy-plane and z-direction for the copy paper containing filler. The results of this study also show that the Brecht-Siewert SEL theory plays a pivotal role when optimizing paper sheet strength properties of a multicomponent papermaking furnish.
机译：商业纸浆配料采用三种强度增强技术进行处理：工业精制，干强度添加剂和动态压区湿压。一个造纸问题是，这三种技术对xy平面和z方向纸张强度的潜在协同或拮抗组合效果尚不明确。这项研究还评估了两种软木牛皮纸纤维来源的工业Brecht-Siewert比边缘载荷（SEL）精制理论：回收的旧瓦楞纸箱（OCC）和东北漂白的软木牛皮纸（BSK）纤维。将漂白的纤维与机械纸浆或桉树纤维和填料混合。将阳离子淀粉添加到纸浆配料中，以模拟挂面纸板，轻质涂层（LWC）原纸，复印原纸和纯软木纸。用中试工厂造纸机压机压实手抄纸。当OCC的游离度下降到低于400 ml CSF时，淀粉与精制之间的相互作用就会增强，这意味着所有强度值都取决于淀粉的添加量和游离度。最少2％的淀粉（浓度为30％）可提供足够的额外氢键结合位点，从而显着提高xy平面和z方向的强度。施加了最佳的1.5 J / m磨浆强度。对于BSK，未发现三种拉伸强度增强技术之间的交互组合效果。然而，增加的淀粉用量，压区压力和SEL导致LWC片材产生协同的z方向强度组合效应变化。主要的拮抗作用是当淀粉和压榨压区压力增加时，LWC片材的撕裂强度降低。最佳的抗张强度值要求不同的纸浆配料具有不同的J / m磨浆强度。 1 L / m的细化强度是优化LWC基片撕裂强度的最佳条件。而对于含填料的复印纸，在Jy平面和Z方向上显示2 J / m的细化强度是最佳的显影强度值。这项研究的结果还表明，Brecht-Siewert SEL理论在优化多组分造纸配料的纸张强度特性时起着举足轻重的作用。

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