共查询到20条相似文献,搜索用时 140 毫秒
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<正>东莞樟木头、黄江、常平是华南规模最大的塑料货源集散地。日前,东莞塑胶网发出提醒,欧盟委员会公布的食品接触塑料材料和制品新法规在3月25日执行,主要调整涉及多种化学物质特定迁移量的收紧。不达要求的塑料制品将被禁止进入欧盟市场,这会影响到企业的出口市场份额。这部法规的全名是"食品接触塑料材料和制品10/2011号法规"。2015年2月初,欧盟委员会称,去年公布的 相似文献
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R. Franck 《European Journal of Lipid Science and Technology》1978,80(1):9-14
Evaluation of Packaging Materials from the Viewpoint of Health In the past three decades, the conventional materials used for food packaging, such as wood, straw, metallic sheet, stoneware, porcelain and glass, have been more and more replaced by the new packaging material, plastic. The macromolecular synthetic resins are, as such, hygienically unobjectionable and especially suitable as packaging materials, since they are insoluble due to their high molecular weight. For the production of plastics, however, low molecular additives are used, which might migrate from the plastics and contaminate the packed foodstuffs. Modification of analytical methods has enabled us to recognize that residual traces of starting materials, such as acryl nitrile, vinyl chloride etc., which are objectionable from the viewpoint of health, may be present in plastic packaging materials. This aspect is critically evaluated and the criteria discussed, on the basis of which the Federal Center for Health may accept additives for plastics used in consumer articles according to the law governing food and consumer articles. 相似文献
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J. P. Ibar 《Polymer-Plastics Technology and Engineering》2013,52(1):11-44
Polymer processing is an engineering field which deals with the conversion of synthetic high polymers into shaped articles ready for use. Impressive developments in the field of polymer processing in the last 20 years or so were precicipitated by the need to process plastic materials with an ever-increasing rate of production within stringent quality requirements. One of the most interesting methods for shaping plastic products is molding which involved all the possible ways for stuffing molds with thermoplastic or thermosetting polymers. Injection molding, compression molding, and transfer molding have now become some of today's routine approaches to plastics shaping. 相似文献
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张友根 《现代塑料加工应用》2012,(3):53-56
介绍了Chinaplas2011塑料成型加工设备绿色技术。结果认为绿色化成为塑料成型加工设备新时期研发的方向;节能、环保、洁净、节材、智能控制等是塑料成型加工设备重点研发的绿色技术;应该围绕绿色技术开展塑料成型加工设备的创新创造工作;绿色技术是不断发展进步的技术。 相似文献
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Chinaplas 2011塑料包装成型加工设备绿色技术的展示,说明绿色化成为塑料包装成型加工设备新时期研发的方向。应用和研发有利于环境保护、节约资源等有助于可持续发展的绿色技术。节能、环保、洁净、节材、智能控制等是塑料成型加工设备重点研发的绿色技术。围绕绿色技术开展塑料成型加工设备的创新创造。绿色技术是不断发展进步的技术。 相似文献
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对高光无痕注射成型工艺的成型装置和辅助控制系统进行了研究和开发,介绍了蒸汽加热注射成型工艺原理。通过辅助系统来控制蒸汽加热模具的型腔温度,特殊的水道设计使模具型腔的温度能够迅速升至熔体的热变形温度以上,进而获得高光表面制品。同时指出了蒸汽加热模具在模具材料的选择、测温点的分布等方面的设计思想,阐述了辅助控制装置的组成部分及控制原理。结果表明,蒸汽加热模具可加工高表面光洁度、无熔接痕、无流痕的塑料制品,可免除后续喷涂工艺,降低了生产成本,成型周期由120 s 缩短到43 s。 相似文献
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本文以橄榄油为脂肪食品模拟物,对市售微波适用塑料容器中有害物质的总迁移量进行了测定。对照我国现行标准中正己烷模拟物的测定结果,发现以橄榄油为模拟物的方法测得样品合格率为20%,而以正己烷为模拟食品测得样品合格率为100%。说明我国现行的相关标准对评价微波加热容器的安全性还存在不足之处。 相似文献
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It is a common industrial practice to blend virgin polymer with the same polymer recycled from scrap plastic that, in general, has not undergone relevant degradation. In this article, the influence that incorporating recycled material has on injection processes, especially on the rheological behavior of the material was studied. With this aim in mind, a mixture of two materials with the same nature or composition and similar viscosity was used, which is the system that is most commonly seen in industry. The mixture studied is composed of virgin PP (polypropylene) typically found in injection processes, and recycled copolymer PP from scrap plastic. A complete characterization of the materials and applied existing models was carried out to predict the mechanical behavior of the mixtures. A model to predict the behavior of the mixtures during processing, based on the rheological characteristics of the materials used was developed. This predictive model has been experimentally validated using filling tests in injection molding machines, as well as by specific simulation software. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2012 相似文献