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首页> 外文期刊>TAPPI Journal >Influence of wet-end variables on the sizing efficiency of ASA on fine papers produced with Eucalyptus globulus kraft pulps
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Influence of wet-end variables on the sizing efficiency of ASA on fine papers produced with Eucalyptus globulus kraft pulps

机译：湿端变量对用桉木牛皮纸浆生产的高级纸张上ASA上浆效率的影响

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The purpose of paper sizing is to make paper more resistant to liquid penetration.Alkenyl succinic anhydride (ASA) is a synthetic sizing agent usually used in alkaline papermaking.ASA has a fast curing size,but it can lose its ability if it is in contact with water.This work studies the influence of dissolved Ca~(2+) and HCO.,ions in the papermaking stock,the effect of precipitated calcium carbonate (PCC),and the influence of pH and temperature on ASA sizing efficiency using bleached Eucalyptus globulus kraft pulps.Two different types of ASA (designated P and UP) and three different emulsions of ASA were used: starch + ASA P,starch + ASA UP,and starch + ASA UP + surfactant.We concluded that a high concentration of dissolved Ca~(2+) ions in furnish diminished the sizing efficiency of ASA.Depending on the type of ASA,concentrations below 300 or 500 ppm did not reduce the sizing efficiency.The amount of dissolved HCO_3~- ions in furnish does not determine the sizing degree of ASA.According to our results,it is possible to work with relatively high PCC loading levels.If it is necessary work with high filler loading levels,however,it is better to increase the ASA concentration in stock.The pH and temperature are the limiting variables of the process; high temperature with high pH reduces the sizing performance of ASA.
机译：上浆的目的是使纸张更耐液体渗透。烯基琥珀酸酐（ASA）是碱性造纸中常用的合成上浆剂.ASA具有快速固化的尺寸，但如果接触会失去其能力这项工作研究了造纸纸浆中溶解的Ca〜（2+）和HCO。，离子的影响，沉淀碳酸钙（PCC）的影响以及pH和温度对漂白桉木ASA上浆效率的影响。我们使用两种不同类型的ASA（分别称为P和UP）和三种不同的ASA乳液：淀粉+ ASA P，淀粉+ ASA UP和淀粉+ ASA UP +表面活性剂。配料中的Ca〜（2+）离子会降低ASA的上浆效率。根据ASA的类型，低于300或500 ppm的浓度不会降低上浆效率。配料中溶解的HCO_3〜-离子的含量不能决定ASA的上浆效率。 ASA.Accordin的上浆度根据我们的结果，可以在较高的PCC负载水平下工作。但是，如果有必要在较高的填料负载水平下工作，则最好增加库存中的ASA浓度。pH和温度是过程;高pH的高温会降低ASA的施胶性能。

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