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将共挤出吹塑成型瓶的层数提高到6层以上但保持传统壁厚,是陶氏化学公司开发的一种新型微层方法的核心思想。这种新技术能够生产层数在30~100层的瓶,是陶氏材料与制品加工研发小组的科学家Sam L.Crabtree在最近塑料工程师协会中空成型分会在芝加哥举办的中空成型年会上介绍的。 相似文献
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近年来 ,随着社会经济的迅速发展和人民生活水平的日益提高 ,我国化妆品、食品、医药、农药、日化等工业也在日新月异的发展 ,其产品包装的技术水平也随着向更高的层次扩展。为了满足社会进步的需求 ,我公司多年来一直不懈地进取、开发了一批机电一体化的高新技术塑料机械产品 ,其中主要有系列塑料中空成型机和系列塑料吹塑机组。塑料中空成型机系列分别为加工最大容量5mL~1000L,并具备最大吹塑容量5000L多层共挤大型中空成型机的开发能力。在塑料吹塑机组系列 ,能生产折径从50mm~12m的多层共挤系列产品。现把我们产… 相似文献
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一、大型包装桶的发展历史大型包装桶按照成型方法可分中空吹塑机和滚塑成型二种,本文就中空吹塑成型的大型包装桶介绍如下: 相似文献
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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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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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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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注塑成型是受热融化的材料由高压射入模腔,经冷却固化后,得到成形品的方法。该方法适用于形状复杂部件的批量生产,是重要的加工方法之一。从注塑用聚乙烯结构特点及其主要原料,分析了聚乙烯注塑成型生产工艺及方法,综述了聚乙烯注塑产品的加工要点,同时指出了聚乙烯注塑产品加工市场的发展趋势。 相似文献
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Rapid heat cycle molding (RHCM) is a recently developed innovative injection molding technology to enhance the surface quality of the plastic parts without extending the molding cycle. Most of the common defects that occur in the plastic parts produced by conventional injection molding (CIM), such as flow mark, silver mark, jetting mark, weld mark, exposed fibers, short shot, etc., can be well solved by RHCM. However, RHCM is not a nostrum for all the defects in injection molding. Sink mark and warpage are two major defects occurring in RHCM. The purpose of this study is to investigate and further solve the sink mark and warpage of the molded parts in RHCM. To solve the problem of sink mark, a new “bench form” structure for the screw stud on the product coupling with a lifter structure for the injection mold was proposed. The external gas assisted packing was also proposed to reduce the sink mark in RHCM. To solve the problem of warpage, design of experiments via Taguchi methods were performed to systematically investigate the effect of processing parameters including melt temperature, injection time, packing pressure, packing time and also cooling time on the warpage. Injection molding simulations based on Moldflow were conducted to acquire the warpages of the plastic parts produced under different processing conditions. A signal to noise analysis was conducted to analyze the effect of the factors, and the optimal processing parameters were also found out. ANOVA was also conducted to quantitatively analyze the percentage contributions of the processing parameters on the warpage. The verification results show that part warpage can be reduced effectively based on the optimal design results. 相似文献
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目的 针对传统汽车车门把手成型工艺在实际应用中塑件收缩变形量大、无法有效控制等问题,开展汽车车门把手气辅成型工艺优化研究。方法 通过确定基于计算机辅助工程的塑件成型方式、设置改造后汽车车门把手塑件结构、优化注塑和注气参数,提出一种针对汽车车门把手气辅成型的工艺优化方案。结果 与优化前成型工艺相比,采用优化后成型工艺得到的汽车车门把手塑件的收缩变形量明显降低,汽车车门把手塑件的收缩变形量均能够控制在0.45%以下。结论 引入计算机辅助工程优化分析技术对实现汽车车门把手整体制件结构设计具有更高的实际应用价值,有利于提升汽车车门把手设计、生产和加工的效率。 相似文献
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气辅注射模塑—一种新型塑料成型工艺 总被引:9,自引:2,他引:7
概述了一种新塑料成型工艺-气辅注射模塑的工艺过程及其应用,由此可对气辅注射模塑有一个较全面的了解。并通过对气辅注射模塑与传统的注射成型枝术及其结构发泡技术的比较,阐述了气辅注射模塑的先进性和优越性。随着科学研究的深入及各项技术的突破,气辅注射模塑将会在塑料加工成型领域中具有重要的地位。 相似文献