热收缩膜包装密封工艺对印刷品表面 形成“水雾”现象的影响

以"红旗渠小盒"烟包产品为例,分析印刷品表面出现"水雾"现象的原因,研究热收缩膜包装密封工艺对印刷品表面形成"水雾"现象的影响。实验结果表明,防水雾光油的涂布厚度、UV固化仪的干燥功率及干燥速率、防水雾光油是否搅拌均匀等密封工艺对"水雾"的形成均有影响。光油层涂布厚度越小,U V固化仪干燥功率越大,干燥速率越小,产品越不容易出现"水雾"。因此,为减少印刷品在热收缩膜包装时出现"水雾"现象,生产前应进行纸张调湿处理,并对产品进行防水雾测试,生产时保证防水雾光油在使用时搅拌均匀,并控制好光油涂布网纹辊克质量、UV固化仪干燥功率及干燥速率,建立各产品的经验数据,以保证产品质量稳定。     

基于白光干涉仪对卷烟包装材料外观质量的评价

目的 建立评价卷烟包装材料外观质量的检测方法,用于对卷烟包装材料的表面印刷适用性进行预判,以提高印刷效率。方法 以水雾面积作为对卷烟包装材料外观质量的主要评价对象,筛选卷烟包装材料印刷面的表观特性。对烟标表面粗糙度、平滑度、亮度、摩擦因数、粗糙度、表面形貌与水雾面积的相关性进行分析。结果 卷烟包装材料外观质量（水雾面积）与粗糙度、亮度等参数相关,与平滑度、摩擦因数等参数不直接相关。在433～818 nm的微观粗糙度内,水雾面积随着粗糙度的增加逐渐减小,当微观粗糙度大于818 nm时,水雾现象不存在。结论 基于白光干涉仪的微观粗糙度可作为卷烟包装材料外观质量（水雾现象）的定量和定性评价指标,该方法为解决烟包印刷行业的水雾问题提供了有益的理论支持。     

铜版纸印刷品全幅面UV上光油量的分析

研究了用铜版纸印刷的中小学课本封面进行UV上光时,上光油的最佳用量.从分析不同上光油量的印刷品,所带来的上光膜层质量的变化,来确定最佳上光油量.UV膜层3个质量参数主要有上光前后白度值、光泽度值和膜层的耐磨度,文章通过对三者的变化规律分析得出了最佳上光油用量.     

纸张表面特性对印刷色彩再现的影响

测定了几种典型烟包用纸的平滑度、光泽度、印刷渗透性、油墨吸收性和纸面效率,根据同种油墨在纸张上的呈色效果和色域情况,分析了纸张表面特性对印刷色彩再现产生的影响。研究表明:具有高的光泽性、平滑度和纸面效率的纸张进行色彩复制时,色差和灰度值较小,有更好的呈色效果和较大的色域范围;纸张偏色导致油墨的呈色效果出现较大的误差,纸张的呈色范围小,最终导致印品的偏色,影响色彩的再现。     

烟包印刷中水性光油耐摩擦性能研究

在烟包印刷用水性光油中添加慢干剂、蜡乳液、阳离子表面活性剂等,配制多组水性光油,以研究光油的流平性、蜡乳液含量、表面张力及干燥时间等对水性光油耐摩擦性能的影响。研究结果表明:不同种类的添加剂及其含量对水性光油的耐摩擦性能影响不同,添加慢干剂、蜡乳液及阳离子表面活性剂均能提高光油的耐摩擦性能,流平性和蜡乳液含量对光油的耐摩擦性能影响最大;慢干剂、初次上光量为光油的流平提供了足够的时间,使得光油自身流平较好,耐磨度较高,而蜡乳液、表面活性剂分别从抵消外部应力和提高光油润湿性能2个方面提高了光油的耐摩擦性能;随着干燥时间的延长,光油的耐摩擦性能得以提高,当镭射纸的干燥时间为10 s、白卡纸的干燥时间为12 s时,其光油的耐摩擦性能最好。     

如何解决烟包印刷过程中印完水光再罩UV出现麻点等流平不好的问题

正为了更好地为包装物表面提供保护及增加其美观等性能,在较多的传统纸盒等(烟包中最常见)包装印刷过程中,通常最后都会印一层UV光油,以达到上述目的。但大部分印刷色组使用的还是溶剂型油墨,如果在此基础上直接印UV光油,会不同程度地出现咬底等问题,为了解决此问题,在罩UV光油前,先印一层水性光油能很好地避免咬底问题。     

纸包装印刷中的光泽度处理技术研究

以纸包装盒印刷品为例,对产品采用了联机上光、脱机上光、覆膜、压光等多种光泽度表面处理工艺,并对不同工艺方法处理后产品的光泽度进行了测试和比较,找出了一种提高印刷品光泽度的最优工艺方法和工艺条件,即印刷上光时正确控制光油厚度,然后在一定的干燥时间和一定的产品堆码高度下进行压光,可使光泽度最高。     

浅谈水性光油使用注意事项

在印刷品之上罩印一遍光油会使印刷品显得更加靓丽，并能对印刷品起到一定保护作用，也方便了对印刷品进行的后续加工并且提高了生产效率，因此在印刷行业中尤其是在包装印刷领域，在印刷品上罩印一遍光油已成为首选。由于水性光油具备环保、不易挥发、操作安全、成本较低等优点，在上光领域正呈现出不断增长的势头。但是在应用水性光油上光时，     

浅谈哑光上光工艺

在印刷品表面上光不仅可以增加其表面平滑度,使其呈现出更亮丽的光泽,而且能够对印刷图文起到保护作用,使印刷成品能够耐热、耐磨、耐水,因而上光被广泛应用于包装装潢、画册、商标、广告、挂历、招贴画等印刷品的表面印后再加工中。     

卷烟包装摩擦系数对卷包上机适应性的影响

正卷烟包装摩擦系数是烟用包装盒上机适应性的重要技术指标,而烟包所用材料和印刷工艺对印刷品摩擦系数都存在较大的影响。纸张的背面处理不同,油墨的种类不同,印刷工艺不同,都会影响卷烟包装的摩擦系数。如果摩擦阻力较大,就会影响到包烟时包装通道的不畅,降低卷烟包装的生产效率。面对卷烟厂提速增效,对烟用包装盒的上机适应性要求越来越高。所以烟包印刷行业需要将印刷品的摩擦系数控制在一定的范围内,建立     

基于 AAO/PTFE 复合薄膜封装的湿度传感器应用

目的研究多孔阳极氧化铝/聚四氟乙烯(AAO/PTFE)复合薄膜应用于湿度传感器封装窗口的水蒸气输运特性和抗污染能力。方法通过旋涂法在双通阳极氧化铝薄膜上制备PTFE微孔膜,将该复合薄膜用作湿度传感器的封装窗口,在定温变湿的环境和油漆喷涂房中分析相对湿度测量的静态误差和动态响应,研究AAO/PTFE复合薄膜对传感器测量的影响和保护功能,并将其与PTFE和PVDF滤膜进行对比。结果定温变湿环境下静态和动态的测量结果表明,AAO/PTFE复合薄膜对湿度传感器造成的测量误差最大可达15%,且误差曲线可以分为30%~50%的低相对湿度区间、50%~80%的中相对湿度区间和大于80%的高相对湿度区间。静态测量的差异是由不同相对湿度区间内试验箱中空气流动速率不同造成的,而动态响应的差异主要源于不同区间内管壳内、外的相对湿度差不同。结论 PTFE薄膜的涂覆不仅保留了AAO滤膜优异的水蒸气输运性能,还有效提高了其表面抗污染能力。     

Insertion of triangulated surfaces into a meccano tetrahedral discretization by means of mesh refinement and optimization procedures

In this paper, we present a new method for inserting several triangulated surfaces into an existing tetrahedral mesh generated by the meccano method. The result is a conformal mesh where each inserted surface is approximated by a set of faces of the final tetrahedral mesh. First, the tetrahedral mesh is refined around the inserted surfaces to capture their geometric features. Second, each immersed surface is approximated by a set of faces from the tetrahedral mesh. Third, following a novel approach, the nodes of the approximated surfaces are mapped to the corresponding immersed surface. Fourth, we untangle and smooth the mesh by optimizing a regularized shape distortion measure for tetrahedral elements in which we move all the nodes of the mesh, restricting the movement of the edge and surface nodes along the corresponding entity they belong to. The refining process allows approximating the immersed surface for any initial meccano tetrahedral mesh. Moreover, the proposed projection method avoids computational expensive geometric projections. Finally, the applied simultaneous untangling and smoothing process delivers a high‐quality mesh and ensures that the immersed surfaces are interpolated. Several examples are presented to assess the properties of the proposed method.     

Certification Institutions Expected to Update and Transfer Information on Present Standards

Standards are the basis for production enterprises to organize production, ex-factory inspection, trade (delivery) and technical exchanges, product certification, quality arbitration and supervision.……     

Flow calorimeter for enthalpy increment measurements on condensed gases

A flow calorimeter for enthalpy increment measurements on condensed gases is presented. A better knowledge of the properties of the liquefied natural gas is needed, and therefore a liquid loop has been designed for our flow calorimeter. The fluid loop in the calorimeter is designed in order to avoid the two-phase region, since two phases would give compositional disturbances in the measurements. The avoidance of the two-phase region is made possible by increasing the pressure of the test fluid after the measurement section, then heating the fluid at super-critical pressure past the critical point. Finally, the fluid is throttled to the low-pressure gas state at the inlet condition of the compressor that circulates the fluid. To perform the pressure increase, a new cryogenic pump has been designed. To evaluate the new equipment, measurements were taken on liquid ethane over the temperature range 146–256 K at pressure between 0.9 and 5.1 MPa.     

Refrigerators Enter a New Era of Health Preservation Frestech initiates the establishment of China's first standard for household sterilization refrigerators

On November 30, 2007, the China Association for Standardization (CAS) held a press conference at Beijing Diaoyutai State Guest House. Leaders from the China Household Electric Appliance Research Institute, the China Household Electric Appliance Association, and the China Consumers' Association attended and made speeches.……     

Optimum-Simulation von Ernteprozessen

Zusammenfassung Bei der Gestaltung von Ernteprozessen — beispielsweise des Prozesses Mähdrusch, Körnertransport und -abnahme — als transportverbundene Fließarbeitsverfahren mit mindestens zwei verschiedenen Arbeitsmitteln gibt es einen großen Optimierungsspielraum. Solche Prozesse sind mehrstufige Bedienungsprozesse mit gemischter Anordnung der Bedienungseinrichtungen. Außerdem besitzen sie stark ausgeprägte räumliche Aspekte. Es wird vor allem gezeigt, welche Merkmale solcher Prozesse in Simulationsmodellen abgebildet sein müssen, welche Zielgrößen in Abhängigkeit von welchen Einflußgrößen unter Berücksichtigung welcher Prozeßbedingungen ermittelt werden sollten und wie der Bewertungsprozeß zur Ermittlung der gewünschten Informationen gestaltet werden muß.     

A study of centrifugal cast high boron high speed steel

In the present study a high‐boron high speed steel (HSS) roll material was designed. Many expensive alloy elements have been substituted by cheap boron alloy, and high‐boron high speed steel roll has been manufactured by centrifugal casting method. The microstructures, mechanical properties and wear resistance of centrifugal casting high‐boron high speed steel roll have been investigated by optical microscopy (OM), scanning electron microscopy (SEM), and X‐ray diffraction (XRD) analysis, hardness test, impact test and wear test. The results indicated that the solidification microstructures of high‐boron high speed steel roll consisted of M₂(B,C), (W,Mo)₂(B,C), M₃(B,C), M₂₃(B,C)₆ type borocarbides and martensite, a small amount of retained austenite. Borocarbides were continuously distributed over the grain boundary. After quenching from 1050 °C, local broken network appeared in partial borocarbides, and fine secondary borocarbide precipitated from the matrix. After tempering from 525 °C, the amount of precipitated borocarbide increased significantly. After heat treatment, the hardness of high‐boron high speed steel roll excelled 60 HRC, and its impact toughness excelled 8.0 J/cm². The single groove steel rolling amount of high‐boron high speed steel rolls increases by 500% than that of bainite cast iron roll, when the rolls are used in K₁ mill housing of bar mill.     

Thixotropy of Systems with Shear Thinning and Plastic Flow Behavior

The definition of the thixotropy is a decrease in viscosity with time in shear and a subsequent recovery of viscosity after the shear deformation is removed.We ...     

Brainstorming for ISO Strategy 2016-2020

正Responding to ISO’s appeal for survey for the to-be-developed ISO Strategy Plan for 2016-2020,SAC hosted a special workshop over the needs and comments of various fi elds on June 8 in Beijing.The workshop was attended by ISO President-elect and Ansteel General Manager Zhang Xiaogang,SAC Vice-Administrator Yu Xinli,and 30 experts from