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正本刊讯:青岛科技大学化工学院陈夫山等人用硝酸镁、氯化镁、硫酸镁取代部分玉米淀粉对瓦楞原纸进行表面施胶,探讨无机盐的添加对瓦楞原纸物理强度及其他性能的影响。结果表明,当淀粉与无机盐的用量比(质量比)为8:2、施胶量为6g.m-2时,相对于施胶前纸样,硝酸镁、氯化镁、硫酸替代部分淀粉施胶 相似文献
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正青岛科技大学化工学院陈夫山等人用硝酸镁、氯化镁、硫酸镁取代部分玉米淀粉对瓦楞原纸进行表面施胶,探讨无机盐的添加对瓦楞原纸物理强度及其他性能的影响。结果表明,当淀粉与无机盐的用量比(质量比)为8:2、施胶量为6g·m-2时,相对于施胶前纸样,硝酸镁、氯化镁、硫酸 相似文献
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将无机盐、无机矿物纤维2种淀粉替代剂分别应用于瓦楞原纸表面施胶,研究了淀粉-无机盐、淀粉-无机矿物纤维表面施胶对瓦楞纸应用性能的影响;探讨了无机盐及无机矿物纤维的不同替代量对施胶后纸样环压、耐破强度性能的影响,并对纸样进行了扫描电镜分析,对施胶成本进行了探讨. 相似文献
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阳离子PSBD与氧化淀粉用于瓦楞原纸的表面施胶 总被引:1,自引:0,他引:1
在高分子分散剂中加入苯乙烯(St)、丙烯酸丁酯(BA)和甲基丙烯酸二甲胺基乙酯(DM)进行无皂乳液聚合得到了阳离子共聚物(PSBD),并对其和氧化淀粉不同配比的混合物在瓦楞原纸表面施胶中的应用进行了研究。讨论了PSBD用量、氧化淀粉用量、pH值和温度对瓦楞原纸性能的影响。结果表明:对瓦楞原纸表面施胶的最佳条件是:氧化淀粉用量5%(对绝干纸),PSBD用量0.6%(对绝干淀粉),温度65℃,pH值5.5,在此条件下,瓦楞原纸的Cobb值为36g·m-2,抗张指数为36.4N·m·g-1,环压指数为8.15N·m·g-1,与原纸相比较,抗张指数和环压指数分别提高了63.2%和81.9%;与单独使用氧化淀粉相比较,抗张指数和环压指数分别提高了15.6%和26.7%,达到A级标准。 相似文献
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使用自制的阳离子聚苯乙烯-丙烯酸酯(HSAE-321)与酶转化淀粉复配成新型表面施胶剂,对瓦楞原纸进行表面施胶.结果表明,新型表面施胶剂不但可以提高瓦楞原纸的抗水性能,还可明显改善其强度性能.当HSAE-321乳液与酶转化淀粉的质量比为1:8,单面施胶量约为3 g/m2时,表面施胶后瓦楞原纸的干、湿环压指数及裂断长与未施胶瓦楞原纸相比分别提高了75%、125%和82%.表而施胶后瓦楞原纸表面的初始接触角增加,并且水珠可在纸面上停留相对较长的时间(约60 s),瓦楞原纸显示出良好的抗水性能. 相似文献
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无机矿物纤维在瓦楞纸表面施胶中的应用研究 总被引:1,自引:0,他引:1
本文主要研究表面施胶淀粉-无机矿物纤维表面施胶体系对瓦楞纸应用性能的影响。用商品矿纤1、商品矿纤2、商品矿纤3取代一部份表面施胶淀粉对瓦楞纸进行表面施胶,探讨矿物纤维的添加对瓦楞纸物理强度及其他性能的影响。结果表明,当表面施胶淀粉与无机纤维的用量比(质量比)为7∶3时,相对于不添加矿纤,商品矿纤1、商品矿纤2、商品矿纤3施胶后纸样的横向环压指数分别增长了83.8%、73.2%、95.5%,纵向环压指数分别增长了90.6%、98.7%、93.8%。在施胶液中添加接枝淀粉型表面施胶剂,防水性能大大提高,Cobb值从140g/m2降至20g/m2左右,满足了成纸的防水性能要求。 相似文献
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纺织产业集群的经济景气研究在国内处于起步阶段,本文依据产品价格调查方法、企业景气调查方法和企业财务数据构建了专业市场型产业集群经济景气的指标体系,该景气指标体系由产品综合价格指数、市场景气指数和企业现金流指数构成。这一体系在中国东方丝绸市场发布的丝绸化纤指数中得到了运用。 相似文献
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本文从整体和分类两个层面分别计算了植物油籽1999-2008年的G-L产业内贸易指数、Brulhart边际产业内贸易指数、Thom&McDowell边际产业内贸易指数,发现我国植物油籽的整体产业内贸易水平非常低,Brulhart边际产业内贸易指数显示我国植物油籽10年来贸易的增量主要来自于产业间贸易,Thom&McDowell指数表明我国植物油籽产业内贸易主要由水平产业内贸易引发。文章认为应该加快科技兴农步伐,提升我国植物油籽的质量,实施产品差异化战略,促进植物油籽品种的多元化,并争取WTO的特别保障条款,减少进口大豆、油菜籽对我国大豆、油菜产业的冲击。 相似文献
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美国烟叶等级指数的制订与应用 总被引:1,自引:0,他引:1
介绍了美国烟叶等级指数的制订原则、计算方法及其应用 ,并对等级指数与品质指数的概念进行了比较 ,同时提出了建立我国烟叶外观品质评价体系的建议 相似文献
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Isabelle Travers Alain Jacquet Adlaïde Brisset Claire Maite 《Journal of the science of food and agriculture》2002,82(9):983-989
Monitoring the hydrolysis or disappearance of starch by the starch iodine test is a simple procedure for determining the maturity of cider apples, but it does not indicate the exact amount of starch present. So far, studies of starch in apples have dealt exclusively with dessert apples. In this paper the relationship between the visual starch index, the dark‐coloured surface area and the real starch content was studied in two varieties of cider apple commonly used in Normandy (France). Starch determination in cider apples required adapting the protocol provided by the Boehringer enzymatic kit. The work led to proposing a simplified index with five scales instead of 10. This index gives the correspondences between the new and old scales as well as the probable starch contents for each new scale. © 2002 Society of Chemical Industry 相似文献
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A new selection index percent emphasis method using subindex weights and genetic evaluation accuracy
The current international standard methodology to quantify trait percent emphasis in selection indexes is based on a simple multiplication of the relative contribution of each trait's economic value (converted to absolute value) and its genetic standard deviation. This method does not reflect the actual selection emphasis applied when the index is used in practice. The economic value does not reflect selection effort when traits differ considerably in their accuracy of evaluation, and no account is taken for either favorable or antagonistic correlations among traits. A new emphasis method adjusted by both accuracy and genetic correlation is proposed. Genetically highly correlated traits are grouped into subindexes by applying a hierarchical clustering method to the genetic correlation matrix. Then each trait's subindex emphasis is calculated within its subindex group, with a weighting included for trait accuracy. Finally, each subindex emphasis is converted to a full index emphasis according to the conventional relative emphasis of its corresponding subgroup. The method can also be applied to sets of breeding values and their economic weights. When applied to a New Zealand sheep breeding selection index where trait genetic correlations are distinct across subindex groups, the new method shrank the emphasis on low-heritability traits, including survival, from 51% to 19%; and expanded that on growth traits from 30% to 49%, better reflecting the selection pressure applied in reality. When genetic correlations across traits were similar, clustering became difficult. Accounting for accuracy affected traits' within-subindex group rankings, whereas the clustering to account for correlations affected all traits within a subgroup equally. Accounting for differences in trait accuracy when describing percent emphasis within selection indexes gives a more practical indication of the likely outcome of selecting on the index. Accounting for correlations among traits when defining percent emphasis made a significant difference only in a subset of case study examples. 相似文献