涂布工艺对厚膜涂布性能的影响

为了得到一定厚度的厚膜,并保证涂膜表面的平整性,分别采用刮涂法、网纹辊涂布法、以及丝网印刷法进行涂布,改变涂布框厚度、刮刀角度、网纹辊绕线直径、丝网目数和版膜厚度对UV涂布油进行涂布,测试涂布膜层的厚度及表面粗糙度,研究涂布工艺对膜层性能的影响.研究结果表明:采用刮涂法可获得较厚、表面较平整的涂膜,且刮刀角度在45°～60°范围内,另外,采用丝网印刷法也可得到性能较好的涂膜,但版膜厚度应很高.     

纸质餐具的生产及推广应用（下）

无论是采用在纸页表面淋膜PE的方法或涂布增水剂的方法，都只需对纸页的一面进行淋膜或涂布。因为餐盒的内层是直接与食品接触的，因此，可以采用颜料涂布的方法来使其达到一定的防水、防油特性。由于颜料涂布的成本低于淋膜PE，而且颜料涂布又可以在抄造原纸的过程中一次同时完成，大大简化了生产工艺流程，特别是经过颜料涂布的纸张一般都具有良好的印刷适性，与在PE膜上印刷需专门的工艺技术相比较而言，其普及性和通用性更强。这样，既降低了生产成本，又方便了印刷操作。而纸质餐具能够印刷则又是其最大的优势。在制金质量保证的前…     

聚酯薄膜生产中影响在线涂布薄膜生产稳定性的因素分析

介绍在线涂布聚酯薄膜生产设备、工艺流程,以及对影响在线涂布薄膜发展的涂布膜生产稳定性的因素进行分析。     

改性PVA涂布膜的现状与发展

改性PVA涂布膜具备安全、环保、可降解特性,是符合国家《新材料产业"十二五"发展规划》的绿色材料,其技术原理是加入不溶化剂后可以使PVA失去水溶性,提高聚乙烯醇和涂层的耐水性,在涂布生产工艺中近几年已经开始广泛使用。目前国内市场已售的改性PVA涂布膜主要来自南京红宝丽(集团)股份有限公司、河北百瑞尔包装材料有限公司、海南赛诺实业有限公司等企业,如能解决改性PVA涂布膜不耐100度以上的蒸煮等技术难题,其应用前景必将越来越广。     

消光型BOPP转移薄膜的研究

目前市场上转移膜基本上都是平膜型转移膜,通过在薄膜上采用涂布、加热、加压的方法将整版色彩完整转印到承印物表面,转移后的图案光泽度较高。但是近年来,越来越多的产品要求图案呈亚光,来降低图案的光泽度。目前采用的工艺是用平膜型转移膜转印后再处理,通过涂布消光剂或经过绒布辊来达到消光效果。     

高阻隔聚乙烯醇涂布膜的研究进展

本文介绍了PVA材料高阻隔性能的机理,对常见的涂布型PVA阻隔膜的耐水改性研究、涂布复合工艺及其制作方法进行了综述,并对已经产业化的涂布型PVA阻隔包装薄膜作了简要阐述。文中将涂布型PVA阻隔膜和商品化的EVOH和PVDC阻隔复合膜进行比较,涂布型PVA阻隔薄膜阻隔性能优异、价格低廉、绿色环保,具有更加广阔的市场前景。     

转移印刷中离型剂膜层厚度研究

离型剂膜层的最佳厚度,可使转印油墨在转印过程中的附着力达到理想值。在室温(25℃)条件下,利用不同涂布压力和涂布速度,在PET塑料薄膜表面涂布了不同厚度及不同质量配比的离型剂,干燥后再涂布了转印油墨。针对不同实验条件下得到的涂布薄膜进行了剥离实验,结果表明:离型剂涂布速度为0.1 m/s,涂布压力为300 N,膜层厚度为9μm,质量配比为3∶1时,转印油墨的剥离效果最理想。     

复合常见问题探讨

一、气泡 涂布量不足产生的气泡 涂布量不够是个相对的概念。复合不印刷的透明膜,涂布量1．8-2．2g就够了,复合印刷膜最好28g以上。决定涂布量时不但要考虑剥离强度,还要顾及流平性。而流平性又与是否采用匀胶辊、基材、胶粘剂的表面张力、工作液的粘度等有关。综合条件好的,可以适当降低涂布量。     

赛诺国际，“一站式”产业链的引领者

企业小档案： 企业名称：赛诺国际有限公司 主营业务：BOPP烟膜、涂布膜、全息激光防伪膜、0PP基材膜、印刷制袋业务的生产、研发和销售 行业排名：涂布膜、全息激光防伪膜国内乃至亚洲第一 企业理想：往行业纵深发展,做国内最大、最强、最精“一站式”软包装材料研发、生产、销售重要基地和加工产业链,做包装行业市场引领者。     

高阻隔包装膜材料

正1.技术类别:新材料2.项目名称:高阻隔包装膜材料3.适用部门:高分子包装领域4.攻术介绍及经济性:第一代产品,高阻隔涂布液及其复合膜,高四隔涂布液是我国自主开发的具有最新国际水平的高阻隔产品,用于涂布于普通塑料簿膜基材(PET,PA,B0PP,PE等),大幅度提高簿膜的氧气阻隔性,超过PVDC涂层(K涂层),成本比K涂层反而降低,可以帮助     

Flexible Electronic Substrate Film Fabricated Using Natural Clay and Wood Components with Cross‐Linking Polymer

Requirements for flexible electronic substrate are successfully accomplished by green nanocomposite film fabricated with two natural components: glycol‐modified biomass lignin and Li⁺ montmorillonite clay. In addition to these major components, a cross‐linking polymer between the lignin is incorporated into montmorillonite. Multilayer‐assembled structure is formed due to stacking nature of high aspect montmorillonite, resulting in thermal durability up to 573 K, low thermal expansion, and oxygen barrier property below measurable limit. Preannealing for montmorillonite and the cross‐linking formation enhance moisture barrier property superior to that of industrial engineering plastics, polyimide. As a result, the film has advantages for electronic film substrate. Furthermore, these properties can be achieved at the drying temperature up to 503 K, while the polyimide films are difficult to fabricate by this temperature. In order to examine its applicability for substrate film, flexible electrodes are finely printed on it and touch sensor device can be constructed with rigid elements on the electrode. In consequence, this nanocomposite film is expected to contribute to production of functional materials, progresses in expansion of biomass usage with low energy consumption, and construction of environmental friendly flexible electronic devices.     

Mineral Oil Barrier Testing of Cellulose‐Based and Polypropylene‐Based Films

Recycled cardboard has been identified as a major source of mineral oil hydrocarbon (MOH) contamination of foods. Identifying and using appropriate functional barriers is a mechanism through which this problem can be addressed. A number of cellulose‐based and biaxially oriented polypropylene (BOPP) films were evaluated as potential functional MOH barriers. The films were tested using a donor material, a paper containing MOH placed on one side of the film barrier and a paper which acted as the receptor on the other. Testing was performed at accelerated conditions of 60°C, the receptor analysed periodically for MOH. The results demonstrated that the cellulose‐based film types provided an MOH barrier of >3.5 years. This contrasted with the BOPP selected films, for which only the proprietary acrylic‐coated BOPP film provided an effective barrier to MOH migration. Further investigation of the MOH barrier properties of the proprietary acrylic‐coated BOPP film was undertaken. Various coating strategies were employed including increasing the coating application weight, increasing the number of coating lay downs and coating one or both surfaces of the film. It was found that an MOH barrier of 1.5 years when tested at 40°C could be achieved for the proprietary acrylic‐coated BOPP film; however, barrier effectiveness was dependent on the coating integrity of the film. Further work with a vertical form filler packaging machine and the use of a staining technique with transmission microscopy proved effective at highlighting and assessing the coating integrity of packets during a typical packaging operation. Copyright © 2014 John Wiley & Sons, Ltd.     

阻隔薄膜在复合软包装材料中的应用与发展动向

按阻隔性的赋予方法对复合软包装材料进行了分类,对阻隔薄膜在复合软包装材料中的应用与开发历程进行了综述。通过对铝箔类、树脂类、透明蒸镀陶瓷类阻隔薄膜的市场动向与发展趋势进行分析,指出透明蒸镀陶瓷阻隔薄膜及其复合软包装材料将是今后环境适应型软包装材料开发的重要方向。     

Whey protein isolate coating on LDPE film as a novel oxygen barrier in the composite structure

To examine the feasibility of whey protein isolate (WPI) coating as an alternative oxygen barrier for food packaging, heat‐denatured aqueous solutions of WPI with various levels of glycerol as a plasticizer were applied on corona‐discharge‐treated low‐density polyethylene (LDPE) films. The resulting WPI‐coated LDPE films showed good appearance, flexibility and adhesion between the coating and the base film, when an appropriate amount of plasticizer was added to the coating formulations. WPI‐coated LDPE films showed significant decrease in oxygen permeability (OP) at low to intermediate relative humidity, with an Arrhenius behaviour and an activation energy of 50.26 kJ/mol. The OP of the coated films increased significantly with increasing relative humidity, showing an exponential function. Although the coated films showed a tendency to have less oxygen barrier and more glossy surfaces with increasing plasticizer content, differences in the OP and gloss values were not significant. Haze index and colour of the coated films were also little influenced by WPI coating and plasticizer content. The results suggest that whey protein isolate coating could work successfully as an oxygen barrier and have potential for replacing synthetic plastic oxygen‐barrier layers in many laminated food packaging structures. Copyright © 2004 John Wiley & Sons, Ltd.     

Thin Laminate Films for Barrier Packaging Application – Influence of Down Gauging and Substrate Surface Properties on the Permeation Properties

A reduction in thickness of barrier laminated film systems generally leads to a quality decrease of the resulting packaging materials' functional properties. Especially for food packaging applications, adequate oxygen and water barrier properties are indispensable. The focus of this study was therefore the development of thin film systems using metallized aluminium or ethyl vinyl alcohol barrier laminates with low oxygen and water vapour transmission properties. Biaxially oriented polyethylene terephthalate and biaxially oriented polypropylene aluminium‐coated thin film laminates as well as corresponding ethyl vinyl alcohol film systems could be successfully produced with oxygen transmission rates of <0.5 cm³(STP)/(m² d bar) and water barrier values of <0.1 g/(m² d). It could be confirmed that the film thickness of these materials within the range of the investigated dimensions does not have an influence on the barrier properties. In fact, the parameters of the production process influence the functional properties of the film systems and must therefore be adapted. Machinability of these excellent thin film systems requires further investigation on packaging lines before they can be transferred to packaging application. Copyright © 2011 John Wiley & Sons, Ltd.     

Aufgedampfte SiOx Barriereschichten unter monoaxialem Stress

SiO_x barrier layers under uniaxial stress For the study of the impact of defined mechanical uniaxial load on the gas barrier effect of a PET (Polyethylenterephthalate) film coated with silicon oxide SiO_x a measurement device was designed. The developed system is modular and can be combined to measure both water vapour and oxygen transmission rate. The gas permeation was measured after a given strain and after unloading the strain on relaxed films.The results show that strain above 1 % can be critical for the increase of gas permeation of coated films under constant stress and 4 % for relaxed film.     

Analysis of corrosion resistant plasma polymer films on metals

To understand the corrosion resistance of plasma polymer film covered metals, the interface chemistry and adhesion, the morphology of the films and the barrier properties have to be studied. Combined methods of thin film spectroscopy, electrochemistry and microscopy are essential to provide the required complementary information. The aim of these analytical studies is the investigation of the detailed correlation between thin film and interface structure and the stability of the coated substrates in corrosive environments.     

Plasmavorbehandlung und Beschichtung von Kunststoffolien. Teil 1: Beschichtung von unbehandelten Kunststoffolien

Plasma Pretreatment and Coating of Polymer Films. Part 1: Coating of Non-treated Polymer Films The food packaging industry demands cheap polymer films possessing a high barrier against permeation of gases, moisture and flavor. Candidates for the most successful materials fulfilling these requirements are vacuum web coated biaxial oriented polypropylene (BOPP) films containing a thin inorganic barrier layer. For a good adhesion of the barrier layer on the BOPP films, the polymer film must be pretreated. The industry uses the Corona atmosphere plasma. This work is separated in three parts. The first part describes the experimental setup and the properties of vacuum web coated layers on polymer films. The next part contains the results of the systematic modification of polymer surfaces by atmosphere and low pressure plasmas. The influence of the surface properties on the final functionality of the coated films is given. In the last part, the discussion of the results of the first and second part reveals systematic relations between the production parameters of the high barrier films and their final functionality. These results firstly reveal the adhesion mechanism of the inorganic barrier layers of the polymer films and the necessary surface properties of the polymer films, in order to get cheap high barrier films by vacuum web coating.     

Application of TiO2-coated alumina beads to dielectric barrier discharge-photocatalyst hybrid process for NO and SO2 removals

NO and SO2 removal by dielectric barrier discharge-photocatalyst (DBD-P) hybrid process was examined for various conditions of process variables. Alumina beads were coated with TiO2 thin film by a rotating cylindrical PCVD reactor and they were packed inside the cylindrical reactor. The NO and SO2 removal efficiencies can be enhanced by using a combination of dielectric barrier discharge and photodegradation by TiO2. The stronger the applied voltage is, the higher the pulse frequency is, or the longer the gas residence time is, the higher the NO and SO2 removal efficiencies become. By applying additional photocatalytic effect, NO removal efficiency increased more significantly than SO2 removal efficiency, because SO2 removal efficiency was already high by dielectric barrier discharge only. In this study, we found that the alumina beads coated with TiO2 thin film by a rotating cylindrical PCVD reactor could be used effectively to remove NO and SO2 by DBD-P hybrid process.     

Characterization of silicon oxide gas barrier films with controlling to the ion current density (ion flux) by plasma enhanced chemical vapor deposition

Silicon oxide gas barrier films were deposited on polyethylene terephthalate (PET) substrates by plasma enhanced chemical vapor deposition (PE-CVD) for applications to transparent barrier packaging. The barrier properties of the silicon oxide coated film were optimized by varying the bias conditions and input power in the radio frequency plasma. The plasma diagnostics, ion current density and substrate temperature were characterized by optical emission spectrometry (OES), an oscilloscope and thermometer, respectively. The coating properties were examined by Fourier transform infrared (FT-IR) spectroscopy and the water vapor transmission rate (WVTR). A high intensity of O and H ions and a high ion current density (ion flux) with a low temperature plasma process were found to be suitable for improving the barrier properties of the silicon oxide film coatings. The Si-O cage-like structure adversely affected the gas barrier properties of the deposited coating. The energy provided by ion bombardment (ion flux) can induce changes in the film density and composition similar to those that may occur by the increase in deposition temperature through rf bias. In addition, the film properties depend not only on a high ion current density (ion flux) and input power, but are also related to a silicon oxide film with a widely distributed planar ring size.