共查询到19条相似文献,搜索用时 46 毫秒
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Helmut Gries 《现代塑料》2013,(2):36-38,41
许多公司通常都把不昂贵且比较小的温度控制系统当作生产设备,由那些负责生产和维护的人员来操作。而冷却设备比较昂贵,当规划新建筑时,管理层经常把冷却系统的安装外包并且作为整个空调系统中的一部分来处理,却很少考虑冷却系统和注塑成型工艺之间的联系。实际上,这种方法忽略了一个事实,即具有成本效益的注塑和高质量的部件往往需要温度控制器和冷却设备之间有一个完美的调节交互作用。 相似文献
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德国Schulman公司在K2004上展示了其完全创新的水辅注塑成型(WIT)工艺生产汽车冷却水管技术,新工艺采用专门为之开发的树脂牌号。这种全新的WTI工艺类似于夹芯注塑成型,先注塑成型冷却水管表层部件,接着注塑成型内芯部件,然后再注入水。Schulman公司指出,这种工艺能用一步法制备表层为30%玻纤增强尼龙(PA)和内层为聚丙烯(PP)的汽车冷却水管,增强PA具有水管要求的强度,而PP内管表面平滑,并且具有接触冷却介质所要求的耐化学性。 相似文献
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从机器参数、材料参数、工艺参数和扰动四个方面简要阐述了其在注塑成型过程中对制品质量的影响;概述了注塑成型制品质量控制的理论和方法,并提出了一种以制品质量和关键尺寸为目标控制参数的在线检测和控制方法;最后对注塑成型制品质量在线控制中的难点进行了总结与展望. 相似文献
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改革开放以来,我国经济突飞猛进,中国也在短时间内成为世界第一大陶瓷卫浴生产国。据国家一份2003年统计表显示,我国成为全球第一大陶瓷卫浴生产国,陶瓷卫浴产品的总产量占全球总量的30。截至去年,这一数字猛增至40。虽然 相似文献
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Katherine Simpson 《Reinforced Plastics》2002,46(12):36
Whether a composite needs to be attractive or functional, getting the right surface finish is vital to a component's suitability for an application. Katherine Simpson reviews some of the current surfacing technologies on offer. 相似文献
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Yusuf Ziya Akpinar Ismail Hakki Uzun Betul Yilmaz Numan Tatar 《Journal of Adhesion Science and Technology》2013,27(11):1096-1106
Objective: The purpose of this preliminary clinical study was to evaluate the effect of novel impression valve system (IVS) on adhesion force of different impression materials to edentulous maxilla. Background data: Impression materials and techniques have an important role in complete denture success. During the functional impression with an individual impression tray (IIT), high adhesive forces exist between edentulous ridge and impression material. Removing the IIT from the mouth with minimal force provides the most accurate and non-deformed impression. Materials and methods: This study included twenty maxillary edentulous patients (n?=?20). Patients who had palatal torus, anatomic undercut, gagging reflex, and flabby ridges were excluded from the study. The age range of the participants was 55–70. All patients gave written informed consent. Two impression materials – zinc oxide eugenol (ZOE) and alginate – were used as experimental material. The digital dynamometer was used to determine the adhesion force of impression materials with and without IVS to edentulous maxilla. The mean values of the adhesion forces were analyzed using the Wilcoxon signed-ranks test (α = 0.05). Results: The effect of IVS on adhesion force was found to be statistically significant (p < 0.05). There were also statistical differences between the ZOE and alginate groups (p < 0.05). Conclusions: The IVS is useful to remove the functional impression from the mouth without any deformation and detaching in cases which high adhesive force occurs. 相似文献
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Paul J. Schroeder 《Desalination》1979,30(1):5-13
A previous work (ref. 1) predicted a massive (29.6 billion gallons per day) market for desalting by the year 2000. The derivation for that figure is discussed. This is followed by a discussion of how the justification for a greater expanded research and development (R & D) program would be affected if the market estimate was off by a factor of 10. Specific R & D needs, and what should be done now, are then discussed. The conslusion is that building five demonstration plants is a good start but much more needs to be done. 相似文献