油墨粘着性与纸张拉毛阻力关系的研究

用７种纸张与８种油和油墨结合进行拉毛的研究发现，对于一定纸张，在印刷中发生拉毛时，与其临界拉毛速度相对应的油或油墨的临界Ｔａｃｋ值为一常数，而临界拉毛速度与油墨粘度的乘积（ＶＶＰ值）并非一个常数。油或油墨的Ｔａｃｋ值随印刷速度的增加而增加。临界Ｔａｃｋ值度量了纸张拉毛阻力的大小，Ｔａｃｋ值与速度的关系度量了油墨拉毛强度的大小。     

APPITA 2017年第1期中英文摘要

正印刷油墨特性对吸塑包装效果的影响根据印刷油墨的特性,本实验研究了印刷油墨黏度和干燥速度对纸张拉毛速度和吸塑包装最终效果的影响。实验结果表明,油墨黏度和干燥速度对纸张拉毛速度和吸塑包装剥离强度均有较大影响。当油墨黏度降低时,纸张拉毛速度增加,而吸塑包装剥离强度逐渐增加。当油墨快速干燥时,纸张拉毛速度降低,吸塑包装所需的剥离强度逐渐减弱。此外,纸张拉毛速度与吸塑包装所需的剥离强度呈理想的线性关系,相关系     

印刷适性试验机的结构、调节与使用(三)——纸及纸板表面强度的测定

在“AIC 2—5”印刷适性试验机的测试中,最重要的测试项目之一是对纸张表面起毛的测定.当印版上的油墨从纸上离开时,油墨在纸面上要产生一种力,这种力随着油墨粘稠度和印刷速度的增大而变大.当作用在纸面的外力大于纸张表面的纤维、填料及涂料结合的力时,纸张表面将要被破坏,这种现象就叫做拉毛.在印刷过程中,影响纸张拉毛的因素很多,最主要的是印刷速度和油墨粘度.若油墨固定,纸张的拉毛速度愈大,说明纸张的表面强度愈高.纸张表面强度是用拉毛速度来表示的.     

印刷过程中纸张拉毛速度的影响因素分析

造纸行业中对于纸张拉毛速度的影响因素分析主要集中造纸工艺中，基本上不考虑印刷工艺对于纸张拉毛速度的影响。实际上印刷工艺对于纸张拉毛速度的影响是非常关键的，不可忽视。本文从印刷工艺的角度，分别就油墨的流变特性、墨层厚度、印刷压力、温度以及油墨撒黏荆成分含量等几个方面分析了对于纸张拉毛速度的影响。     

印刷油墨粘度粘性探讨（续）

印刷压力和墨层厚度一定时候,纸张的拉毛速度V和油墨的塑性粘度η_塑之积是一个定值,并且用符号C表示。而纸张的表面强度T又与C成正比。所以有:     

油墨粘度的调整

在胶印过程中,油墨的粘度对印刷品质量有很大影响。粘度偏大,易引起传墨不匀,造成橡胶布堆墨,纸张拉毛、掉粉,并容易出现花版;粘度偏小,则容易造成网点扩大、油墨乳化,版面出现浮脏等故障。我们在长期工作中,摸索出一些对油墨的调整方法,现介绍如下: 1.在印刷精细产品时,如果油墨粘度偏大或因纸质差造成拉毛、糊版时,可采用撤粘剂来解决问题。因为撤粘剂在降低油墨粘度的     

涂布纸印刷适性的测试与评价方法

纸张的印刷适性是指纸张能适应油墨、印版及印刷条件的要求 ,保证印刷作业顺利进行 ,并获得优良印刷品必备的条件 ,包括印刷作业适性和印刷质量适性两个方面 ,其中印刷质量适性指纸张对印品质量起决定性作用的性质 ,如白度、不透明度、平滑度、表面强度和油墨吸收性等。涂布纸是原纸经涂布和整饰加工后制成的纸 ,用于高级印刷。本文着重介绍的是印刷适性仪的纸张印刷适性测试方法及其评价方法。1　纸张的拉毛速度和拉毛阻力　　当油墨从印版和橡皮布转移到纸张表面的过程中 ,都要受到外界施加的拉伸应力作用 ,与此同时由于油墨内聚能作用 ,…     

油墨粘度的调整

在胶印过程中,油墨的粘度对印品质量有很大影响。粘度偏大,易引起传墨不匀,造成橡皮布堆墨、纸张拉毛、掉粉,并容易出现花版;     

油墨粘度的调整

在胶印过程中,油墨的粘度对印刷品质量有很大影响。粘度偏大,易引起传墨不匀,造成橡皮布堆墨、纸张拉毛、掉粉,并容易出现花版;粘度偏小,则容易造成网点扩大,油墨乳化,版面出现浮脏等故障。我们在长期工作中,摸索出一些对油墨的调整方法,现介绍如下:     

氧化淀粉和聚乙烯醇混合液在高档双胶纸上的应用

纸张的表面强度是决定印刷品质量的重要因素之一。印刷表面强度是指纸张在印刷过程中受到油墨剥离张力作用时所具有的抗掉粉、掉毛、起泡以及撕裂的性能,用纸张的拉毛速度来表示,单位是m／s。     

PGLA纤维力学性能与结晶和取向的关系

通过研究PGLA纤维力学性能与结晶、取向结构之间的关系,发现:PGLA纤维的弹性模量和断裂伸长率取决于非晶区取向函数和结晶度,而与实现结晶和取向的加工条件无关。在实验条件内,弹性模量与非晶区取向函数符合线性关系Ey=31.202+76.175fa;结晶度增加至约15.5%时弹性模量出现快速增加;断裂伸长率随结晶度和非晶区取向函数的增大而单调降低且降低速率逐渐减小。     

STATISTICAL EVALUATION OF ARRHENIUS MODEL AND ITS APPLICABILITY IN PREDICTION OF FOOD QUALITY LOSSES

To minimize quality losses occurring during processing and storage and to predict shelf-life, quantitative kinetic models, expressing the functional relationship between composition and environmental factors on food quality, are required. The applicability of these models is based on the accuracy of the model and its parameters. In this paper, the calculation of the Arrhenius parameters and the accuracy of the derived model were compared, using three statistical methods, namely: linear least squares, nonlinear least squares and weighted nonlinear least squares. Results indicated that the traditional two-step linear method, was the least accurate and the derived energy of activation and the pre-exponential factor had the largest confidence interval. The latter was shown to have a profound effect on the precision of the calculated rate constant and the predicted shelf life. Based on previous reports that indexes of deterioration     

MATHEMATICAL MODELING OF HEAT AND MOISTURE TRANSFER-RELATED PROPERTIES OF INTERMEDIATE MOISTURE APPLIES

Mathematical models for heat and moisture transfer-related properties of intermediate moisture apples were developed. The models of thermal properties were based on a linear dependence of thermal conductivity on temperature and moisture content, a logarithmic dependence of bulk density on moisture content, and a linear dependence of specific heat on moisture content. The effect of moisture content and temperature on moisture diffusivity was modeled by an exponential relationship. The sorption data were adequately fitted by the Modified Henderson's equation.     

相对三刺激值的分析与证明

本文进一步论证了相对三刺激值与印刷网点百分比之间的关系,证明了该公式存在的理论误差,推导出公式误差主要影响暗调部分,并给出了最大理论误差的范围以及该公式的适用范围。     

不同类型炭源材料与金刚石晶体的生长

研究炭源材料与金刚石晶体生长的关系问题，对炭源材料和金刚石合成技术的发展，有重要的实际价值。叙述了炭源材料的性能与金刚石晶体生长的关系。讨论了不同炭源材料转变全刚石的行径与影响转变效果的因素。在对炭源材料性能进行多种测试与分析的基础上，指出了合成金刚石炭源的优选原则及其重要性和必要性。     

RESPONSE OF BANANAS AND PLANTAINS TO IMPACT FORCES

Banana and plantains were obtained at green firm stage and stored at 20C and 90% relative humidity for up to 11 days. Some of the fruits were removed each day from storage and subjected to three impact energy levels (0.206, 0.514 and 0.828 J) using a specifically designed impacter. The impacted fruits were incubated at the same storage conditions for 24 h before assessing the bruise volume. Two models relating the bruise volume, the impact energy and the storage time were developed for both fruits. For bananas, the bruise volume had a linear relationship with the energy absorbed by the fruits, whereas the relationship was nonlinear for plantains. Plantains seemed to sustain less bruise volume than bananas during the initial storage period, but their bruise volume increased much faster in the subsequent storage days than bananas.     

碧螺春茶在贮藏过程中的品质劣变及生化成分与感观品质的相关性研究

本文研究了碧螺春茶在贮藏过程中主要生化成分（含水量、咖啡碱、氨基酸、总糖、叶绿素、茶多酚、水溶性物质和抗坏血酸）的劣变趋势及感官审评的变化情况,采用多元线性回归对其二者做了相关性研究,结果如下：在碧螺春茶品质劣变过程中,抗坏血酸的氧化程度与碧螺春茶的感官品质劣变程度关系最为密切,其相关性达到了0.992（P＜0.01）;通过抗坏血酸的氧化情况可以大体得出碧螺春茶劣变程度,并且存在如下关系：y（品质得分）=32.447＋305.390x（抗坏血酸）.     

THE EFFECT OF MOISTURE AND NITROGEN LEVELS ON MILLING ENERGY OF BARLEY

Milling energy values of both spring and winter cultivars of barley are shown to be highly influenced by moisture content of samples. Within the range 10 to 18% moisture, the relationship between milling energy and moisture content was linear. For spring barley, milling energy values could be adjusted to a common moisture content of 12% using a correction factor of 25 Joules for each percent moisture. Nitrogen content of malting samples correlated poorly, although still at a significant level, with milling energy and considerable variation in grain hardness could be observed at any nitrogen level considered suitable for malting.     

高速纺涤纶有光三叶异形丝的可纺性探讨

本文讨论了在三叶有光ＰＯＹ－ＤＴ生产过程中,喷丝板毛细孔尺寸与可纺性的关系。计算不同叶长,叶宽,孔数的喷丝板毛细孔的当量直径,单孔流量,剪切速率,喷头拉伸比,三叶异形孔压力降和异形度。验证了喷丝孔的结构参数是影响可纺性的关键因素。合理的异形喷丝孔结构,可纺性较好,工艺条件较好控制,理论异形度与纤维异形度较接近。因此,在设计过程中要综合考虑喷丝板结构各参数,此外,还讨论了结构不同的三种异形喷丝板的清洗方法和效果以及其使用寿命。     

SELECTED PHYSICAL AND MECHANICAL PROPERTIES OF COMMERCIAL APPLE CULTIVARS1

The compressive modulus of deforatability, strength and strain of failure of apple flesh of 12 commercial apple cultivars were determined using a Universal Testing Machine. The deformability modulus, calculated from the linear part of the corrected stress-Hencky's strain relationship was between 1.5 to 2.3 MPa with a coefficient of variation of 9–26%. The apparent upper limit of the strain in the linear region was on the order of 0.08–0.2. The compressive strength was on the order of 160–280 kPa, with the Baldwin apples a notable exception with strength twice as large. Failure usually occurred at a strain of 0.12–0.16 with the exception of the Baldwin and Granny Smith apples for which failure occurred at a strain of 0.25 and 0.2, respectively. The variability in the failure parameters