共查询到20条相似文献,搜索用时 171 毫秒
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1多层共挤出中空塑料成型机
多层吹塑高阻隔性中空制品在中空制品领域内占的比例越来越大,其工艺是通过复合模头把几种不同的原料挤出吹制成型中空制品,达到容器对CO2、O2或汽油等的阻隔性能。 相似文献
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(上接2012《塑料包装》第6期)6中空塑料成型机的中国制造及创造6.3单层小型挤吹中空塑料成型机单层小型挤吹中空塑料成型机,单层小型挤吹中空塑料成型机在我国制造的挤吹中空塑料成型机中占绝大多数,5L及5L以下的挤吹中空塑料成型机占小型挤吹中空塑料成型机中绝大多数。单层小型挤吹中空塑料成型机,一般指成型20L以下的单层挤吹中空塑料容器。单层小型挤 相似文献
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“一步法”注拉吹中空塑料成型机是加工PET、PP饮料瓶的高速、高效、节能的塑料成形机,在我国有着广阔市场。长期来,国内“一步法”注拉吹中空塑料成型机市场一直被日本占领,国内虽进行了研发,但没有能够成为商品化,至今还没有一个塑料机械厂能生产出达到制品质量要求的注拉吹中空塑料成型机,制品质量具体表现在壁厚不均匀。现在新投入开发出的注拉吹中空塑料成型机,在主机的机械机构和控制等方面有所进步,但在模具方面还不成熟。 相似文献
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塑料型坯径向控制系统研制取得突破性进展 总被引:1,自引:0,他引:1
中空成型机塑料型坯的径向壁厚控制系统的研制工作在我国取得突破性的技术进展,最近这项技术在江苏张家港市同大机械有限公司已经获得关键性的技术突破,据了解,这项控制技术可以实现塑料型坯壁厚径向控制的多点准确控制,控制点可以方便的实现2~16点以致更多点控制。 相似文献
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目的鉴于壁厚控制的复杂性,建立基于有限元型坯尺寸的预测方法。方法采用WorkbenchPOLYFLOW分析软件模拟型坯吹胀的过程,获得均匀的型坯尺寸吹胀成型的IBC内胆壁厚分布;分析型坯初始尺寸对制件最终壁厚分布的影响;确定制件壁厚的薄弱部位及其相对应的型坯位置;调整型坯轴线方向控制点的初始尺寸,获得改善制件最终壁厚的型坯轴线方向的初始壁厚曲线。结果该曲线仿真壁厚极差为2.27 mm,通过大型中空成型机试生产,确定了型坯初始壁厚实验曲线,验证了预测型坯曲线的正确性。结论该尺寸预测方法缩短了生产周期,准确性高,具有较好的实际应用价值。 相似文献
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中空吹塑成形技术探讨 总被引:1,自引:0,他引:1
吹塑加工成形也称中空吹塑,是一种发展迅速的塑料加工方法。它是将挤出的熔融塑料毛坯,置于模具内,借助压缩空气吹胀而贴于型腔壁上,经冷却硬化为塑件,此方法主要用于成型空心塑件。制品包装容器、工业制品将有较大增长,而且注射吹塑、多层吹塑会有快速的发展。针对中空吹塑加工技术的应用和发展,介绍了中空吹塑成型的加工方法,分析了中空吹塑成型基本性能的技术要求,研究了中空吹塑成型加工的塑料模具设备,同时指出了聚合物中空吹塑成型加工技术。 相似文献
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目的解决塑料药筒口部壁厚偏差较大,造成紧塞盖装配困难的问题。方法采用金属底预埋的方式,将机加成形的金属底与药筒筒体,在注塑过程中实现了注塑一体结构。结果采用注塑加工,从根底上解决了药筒筒体的壁厚差不均问题,而且还可减少切封头、涂胶、精车全长等多道工序,也能从很大程度上提高塑料材料利用率。结论采用注塑生产的塑料筒身密度、强度、注塑精度及内外表面光滑度、内弹道性能等指标,均优于吹塑产品。经分析以上两种产品结构均能满足产品使用要求,工艺方法合理可行。 相似文献
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D.M. Gao K.T. Nguyen J.-F. Hétu D. Laroche A. Garcia-Rejon 《Advanced Performance Materials》1998,5(1-2):43-64
In the last twenty years injection molding and blow molding have seen a rapid growth due to the development of new application areas in the automotive, sports and leisure, electronics, transportation and packaging industries. This success can be traced to the optimization of existing processes and to the development of new processing techniques employing novel concepts such as gas-assisted injection molding, co-injection, and 3D and sequential blow molding. The complexity of these new molding techniques calls for a much better understanding of the material behavior during the basic stages of the process and its relation to the properties and performance of the final part. These characteristics are directly dependent upon die and mold designs and on the operating conditions during extrusion, injection, inflation and cooling in the mold.In this paper we will demonstrate how the numerical simulation of the individual steps of the process can be used to optimize the process and product performance of industrial parts. In the case of injection molding, special interest will be devoted to the numerical prediction of the filling phase for both thin and thick parts. For blow molding the prediction of material behavior during clamping and inflation will be shown and related to final part thickness distribution, parison programming and preform design. 相似文献
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J. Biglione Y. Béreaux J.-Y. Charmeau J. Balcaen S. Chhay 《International Journal of Material Forming》2016,9(4):471-487
Single stage injection blow molding process, without preform storage and reheat, could be run on a standard injection molding machine, with the aim of producing short series of specific hollow parts. The polypropylene bottles are blow molded right after being injected. This implies that the preform has to remain sufficiently malleable to be blown while being viscous enough to avoid being pierced during the blow molding stage. These constraints lead to a small processing window, and so the process takes place between the melting temperature and the crystallization temperature, where the polypropylene is in its molten state but cool enough to enhance its viscosity without crystallizing. This single stage process introduces temperature gradients, high stretch rate and high cooling rate. Melt rheometry tests were performed to characterize the polymer behavior in the temperature range of the process, as well as Differential Scanning Calorimetry. A viscous Cross model is used with the thermal dependence assumed by an Arrhenius law. The process is simulated through a finite element code (POLYFLOW) in the ANSYS Workbench framework. The geometry allows an axisymmetric approach. The transient simulation is run under anisothermal conditions and viscous heating is taken into account. Sensitivity studies are carried out and reveal the influence of process parameters such as the material behavior, the blowing pressure and the initial temperature field. Thickness measurements using image analysis are performed and the simulation results are compared to the experimental ones. The simulation shows broad agreements with the experimental results. An optimization loop is run to determine the optimal initial thickness repartition. Design points are defined along the preform and the optimization modifies the thickness at these locations. 相似文献
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目的 为减少对化石燃料的广泛依赖,用生物质复合材料替代合成纤维增强复合材料,制备轻质、缓冲等高性能天然纤维复合材料,开辟环境新材料领域创新的方向.方法 通过不同种类生物质填充物及配比变化,一步成型制备一种可降解轻质发泡缓冲材料,研究缓冲材料产品缓冲性能.结果 相同填充比例条件下,玉米秸秆发泡体缓冲性能优于汉麻秆芯材料;相同填充物条件下,填充比例为30%~40%,缓冲性能良好.结论 为各行业应用提供了环境友好的替代性结构产品,扩展了复合材料应用范围,尤其研发成本低、性能好的生物质复合材料具有重要战略意义. 相似文献