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产品是人们对原材料采用特定的技术方法和工艺加工完成的制品,产品进入流通领域后便成为商品,商品应有一定的功能和质量特征,它的使用者要求其要有一定的质量保证。在商品生产的发展初期,商品交换出现后,为了保证商品的正常流通,人类创造并发展了包装,现代商品包装... 相似文献
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卷烟的几种包装防伪技术 总被引:1,自引:0,他引:1
1.薄膜防伪技术 在卷烟生产中综合利用薄膜和其他的一些安全措施,就可以起到防伪的目的。例如印刷薄膜就很难仿造。世界著名的卷烟包装材料公司——UCB公司总裁托里先生说:印刷薄膜在欧洲已使用了数年,起到了促销和吸引消费者的目的。印刷薄膜的工艺愈完善、质量愈高,仿造者就很难仿造出与正品卷烟完全一样的卷烟用包装薄膜。 相似文献
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本文描述了国内外防伪领域标准化工作的情况,介绍了防伪国家标准对于提升我国防伪技术整体水平、促进我国防伪行业技术进步、提高企业核心竞争力所发挥的作用。根据防伪技术的发展趋势,对我国防伪标准化工作提出了一些建议。 相似文献
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我国正处于改革开放时代,社会主义市场经济发展迅速。但各种假冒伪劣商品泛滥,严重影响了国民经济的发展,并使国家和消费者蒙受了巨大的经济损失。为此商品的包装除了需要满足容装性、显示性、陈列性等要求外,还需要具有一定的防伪功能即采用防伪包装。目前,防伪包装应用很广泛,特别是随着新材料技术的研究和发展,推动了防伪包装材料的开发和应用。如各种防伪纸、防伪薄膜、防伪胶带及专用油墨等材料广泛地应用于商品的包装和印刷。近年来,国内外许多企业、公司及科研机构研制出许多新型的防伪包装材料,并取得了满意的效果。下面我… 相似文献
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防伪技术分类及复合密码引论 总被引:3,自引:0,他引:3
防伪与仿造是一场集智慧、财富、科学技术、伦理道德、法律于一身的较量,较量的一方是千方百计使人无法仿造,另一方则尽其所能使其制造出来。斗争越来越向高、精、尖方向发展,但总有一天会随着法律的健全、物质财富的极大丰富、人类素质的提高而自行消亡。从防伪技术或... 相似文献
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对圆柱形金属橡胶结构做静态实验,运用最小二乘法对实验数据进行拟合,得到金属橡胶材料本构方程的各系数,将由实验得到的各系数代入本构方程式中,从而得到理论拟合迟滞回线,将理论拟合迟滞回线与试验迟滞数据进行对比,发现理论拟合迟滞回线与试验迟滞数据吻合较好,同时运用ANSYS有限元软件对金属橡胶结构进行有限元建模、定义边界条件及施加载荷,最后进行应力应变分析,得到应力应变分布图,发现分析结果与实验结果吻合。 相似文献
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AbstractObjectives were to study mechanical properties of various solid forms of paracetamol and relate to their crystal structures. Paracetamol form I (PRA), its cocrystals with oxalic acid (PRA-OXA) and 4,4-bipyridine (PRA-BPY) and hydrochloride salt (PRA-HCL) were selected. Cocrystals and salt were scaled-up using rational crystallization methods. The resulting materials were subjected to different solid-state characterizations. The powders were sieved and 90–360?µm sieve fraction was considered. These powders were examined by scanning electron microscopy (SEM) and densities were determined. Tablets were made at applied pressures of 35–180?MPa under controlled conditions and the tablet height, diameter and hardness were measured. Tensile strength and porosity of the tablets were estimated using well known models. Crystal structures of these systems were visualized and slip planes were identified. Cocrystal and salt of PRA were physically pure. Sieved powders had comparable morphologies and particle size. The apparent and theoretical densities of powders were similar, but no clear trends were observed. The tensile strengths of these compacts were increased with increasing pressure whereas tabletability decreased in the order oxalic acid?>?PRA-HCL?≈?PRA-OXA?>?BPY?>?PRA-BPY. Tablet tensile strength decreases exponentially with increasing porosity with the exception of PRY-BPY and BPY. Slip plane prediction based on attachment energies may not be independently considered. However, it was possible to explain the improved mechanical properties of powders based on the crystal structure. Cocrystallization and salt formation have introduced structural features that are responsible for improved tableting properties of PRA. 相似文献
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Mixed crystals of calcium-cadmium iodate were grown by a simple gel technique using diffusion method. The optimum conditions
were established by varying various parameters such as pH of gel solution, gel concentration, gel setting time, concentration
of reactants etc. Crystals having different morphologies and habits were obtained. Prismatic, dendritic crystals of calcium-cadmium
iodate and prismatic needle shaped, hopper crystals of mixed iodate were obtained. Some of them were transparent, some transluscent
and a few others were opaque. The crystals were characterized using FT-IR, EDAX, XRD, TGA and DTA. 相似文献
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阐述和分析了CTP技术的发展情况及特点;探讨了目前CTP发展中存在的认识不高、缺乏政策导向、设备版材配套研发不够、机制问题引起的市场恶性竞争问题突出和数字化环境建设及技术人才培养不够4个方面问题,并提出了发展对策;指出并分析了CTP技术4个主要发展动向:紫激光、热敏CTP发展迅速;外鼓式制版机成为主流;光敏型CTP版材紫激光光聚合版将成为主流;热敏型CTP版材免处理版方兴未艾. 相似文献
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透明聚氨酯树脂材料的热性能和力学性能 总被引:5,自引:0,他引:5
以4,4′-二环己基甲烷二异氰酸酯(H12MDI)、聚醚多元醇、交联扩链剂、催化剂及助剂合成了一些透明聚氨酯树脂材料。用FT—IR对其结构进行了表征。DSC、TGA测试其玻璃转化温度为95℃~110℃,质量损失5%和10%的热分解温度为265℃、280℃~286℃。SEM对其断口形貌分析表明,其断裂为脆性断裂或韧性断裂。力学性能测试其拉伸强度49MPa~56MPa,断裂伸长率11%~16%,抗弯强度106MPa~116MPa,弹性弯曲模量2006MPa~3089MPa,冲击强度19kJ/m^2~35kJ/m^2,邵氏硬度80D。透先率91%~93%。实验结果表明,透明聚氨酯树脂材料具有卓越的光学性能,优良的力学性能和中等的热稳定性能。 相似文献