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通过在一文化纸机上的生产中试,研究微涂配方对胶版印刷纸适印性能的影响。实验发现当微涂的配方改变时,成纸的印刷适性诸指标也随之改变。综合考虑成纸性能与生产成本,比较合理的微涂配比为胶黏剂用量14份,胶黏剂中淀粉与胶乳的比例3:11,白料中瓷土与GCC的比例为30:70。 相似文献
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在铜版纸、涂布白纸板等产品的涂料配方中,合成胚乳已经成为主要胶粘剂得到了广泛应用。由于合成胚乳的性质与涂料流变性、涂层强度、抗水性能、涂布纸光泽度、印刷适印性等密切相关,同时,合成胚乳价格一般不菲,因此,铜版纸厂家在选定胶乳品牌时都十分慎重。对于中小型铜版纸厂,一般都不具备从涂料制备。涂布、压光到印刷适性测定等一整套试验室试验装置和手段,不可能通过系统的试验来选择合成胶乳的品牌。我们在实践中摸索出了一套能快速判断合成胶乳能否适用于制备涂料的测试方法,现介绍如下。1合成胶乳的测试方法1.1固含量在扁… 相似文献
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本文从铜版纸的成本角度出发,在颜料配比(GCC∶Clay)、固含量、胶黏剂三个方面对高浓涂料配方进行优化,实验证明:最佳工艺条件为:颜料配比(GCC∶Clay=8∶2),固含量73.5%,胶乳用量9%,涂布淀粉用量2%。 相似文献
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一、前言一张高品质的A等铜版纸,不仅应该具有平整、光滑、表面细腻的涂层,而且还应该具备适合多色套印、高速印刷适性的要求。即使在1.4万张/小时的高速度印刷下,涂层也不会起毛,更不会掉粉。这就要求铜版纸的涂层应有足够的粘结强度。通常生产铜版纸只采用一次涂布加工,而我厂生产的A等铜版纸是采用二次刮刀涂布加工。第一次涂布(底涂)对于整个涂布过程起了承上启下的作用,如果第一次涂层的粘结强度不足,那么第二次涂料的胶粘剂选用得再好,用量再多,也无作用。当今市场上可选用的胶粘剂品种繁多,选用什么品种的胶粘剂来满足… 相似文献
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纸张经涂布加工之后,涂料覆盖在多孔纸面,从而形成平滑细腻、油墨传递性良好的涂层,可显著地改善纸张的印刷适性。本文就铜版纸的平滑度、油墨吸收性、印刷适性做一简要概述。1铜版纸的平滑度铜版纸的平滑度,是指印刷压力下的平滑度,可分为“宏观平滑度’郴“微观平滑度”。前者由原纸性质决定,后者由颜料的种类、晶形及粒度分布等决定。就印刷光泽度来讲,“微观平滑度”比“宏观平滑度”更为重要。以下条件可以改善铜版纸的平滑度:()采用高平滑度、压缩性良好的原纸;(2)增加颗粒细腻、晶形为六角片状的高岭土颜料的配比;(3… 相似文献
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高岭土颜料泥浆及其所形成之涂料的流变学原理 总被引:2,自引:0,他引:2
配制涂料时流变学如同涂布纸的光泽度、白度、不透明度、平滑度、印刷适性等同样重要.涂料的流动行为不仅影响到运转性能、能耗,而且也可能影响到成纸的质量,如孔隙度、白度、不透明度、光泽度及印刷适性等.流动特性在整个涂布系统中起着重要作用,包括涂料制备、输送、施涂、胶膜形成和固化. 相似文献
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Elena Poverenov Roi Rutenberg Shani Danino Batia Horev Victor Rodov 《Food and Bioprocess Technology》2014,7(11):3319-3327
Two different approaches, blending and layer-by-layer electrostatic deposition (LbL), were utilized to combine two biopolymers, gelatin and chitosan, in edible films or coatings. The performance of the blended and LbL composite films and single-component gelatin and chitosan films was compared in terms of mechanical, optical, and spectroscopic properties. In parallel, edible coatings based on these formulations were applied on a food model: fresh-cut melon. Physiological, textural, and microbiological parameters of the coated fruit were studied in comparison with non coated control. Surprisingly, in spite of the higher thickness, the composite films and especially the LbL formulation demonstrated enhanced water vapor permeability as compared to single-component films. The LbL film had higher strength and better elasticity than the blended one. All edible coatings containing chitosan effectively inhibited microbial growth on fresh-cut melons. The LbL formulation demonstrated the most effective inhibition of the total microbial growth especially after 5–7 days of storage, while the blended formulation demonstrated high antifungal activity after 11 days of storage. The LbL formulation demonstrated superior performance in preservation of fruit texture and also slightly reduced fruit weight loss, while the blended formulation did not improve these parameters. Both composite coatings do not obstruct fruit gas exchange and do not cause accumulation of off-flavor volatiles. 相似文献
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Efficacy of Antimicrobial Pullulan‐Based Coating to Improve Internal Quality and Shelf‐Life of Chicken Eggs During Storage 下载免费PDF全文
Mohamed K. Morsy Ashraf M. Sharoba Hassan H. Khalaf Hassan H. El‐Tanahy Catherine N. Cutter 《Journal of food science》2015,80(5):M1066-M1074
There has been a growing interest in the use of natural materials as a delivery mechanism for antimicrobials and coatings in foods. The aim of the present study was to evaluate the effectiveness of pullulan coatings to improve internal quality and shelf‐life of fresh eggs during 10 wk of storage at 25 and 4 °C. Three treatments of eggs were evaluated as follows; non‐coated (control; C), coated with pullulan (P), and coated with pullulan containing nisin (N). The effects of the pullulan coatings on microbiological qualities, physical properties, and freshness parameters were investigated and compared with non‐coated eggs. For non‐coated eggs, as storage time increased, yolk index, albumen index, and Haugh unit value decreased and weight loss increased. However, pullulan coatings (P or N) minimized weight loss (<1.5%) and preserved the albumen and yolk quality of eggs (with a final B grade) 3 wk longer than non‐coated eggs at 25 °C. At 4 °C, both P‐ and N‐coated eggs went from AA to A grade after 9 wk and maintained the grade for 10 wk (4 wk longer than that of non‐coated eggs). This study is the first to demonstrate that pullulan coatings can preserve the internal quality, prolong the shelf‐life, and minimize weight loss of fresh eggs. 相似文献
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在紫外老化箱中对原纸表面涂覆不同比例的纳米TiO2/β-环糊精(β-CD)涂料的涂布纸进行抗紫外光返黄实验,并利用SEM和FT-IR等手段分析光照前后的纸张涂层结构和涂料成分。结果表明:经紫外光照30h后,涂布纸表面涂层稍有结块,而涂料成分没有发生明显变化;光照前后涂覆不同比例的纳米TiO2/β-CD涂料的涂布纸物理性能均优于涂布原纸,其中用含量为2%纳米TiO2和1%β-CD(均相对于涂料的质量分数)的涂料涂覆的涂布纸的物理性能和光学性能最好;用含量为3%纳米TiO2和1%β-CD的涂料涂覆的涂布纸不仅不能提高纸页的抗返黄能力,反而会加速其返黄进程。 相似文献