汽车后视镜罩注塑模设计-塑料注射模具含7张CAD图
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译文: 赫希约翰传统塑料的新用途塑料工业转载自IAPD杂志8月/ 2001年9月在历史上制造商依赖于丙烯酸是标志,冲击改性丙烯酸酯和聚碳酸酯形状时,热成型的面孔是设计标志的一部分。在过去的几年中,几个技术的融合,增强了国际上最通用的热塑性塑料高的影响,一效益易于制造ABS装置(丙烯腈丁二烯苯乙烯)。 这就是你说“等一等! ABS的耐候性非常差,并已被涂用于室外。”虽然主表面画一直是最常见的方法来保护ABS防抱死刹车,更先进的共挤功能,新的树脂发展的到来,并改善热成型技术已导致在一个突破。通过结合一顶面层包含更多Uvstable塑料ABS板材,往往是一丙烯酸或ASA(丙烯腈,苯乙烯,丙烯酸酯)共聚物,耐候性,才能实现。独特的平衡性能当正确指定和建造,这些材料可以提供一个独特的平衡性能的成形性,韧性和制作简单的ABS以及固有的高光泽,易于着色和装饰,和伟大的抗紫外线的丙烯酸树脂。这是非常重要的,但是,讨论您的工作表与所有供应商的最终使用参数。许多变数,包括最后一部分的厚度(最薄的部分后形成),厚度和顶面层(透明压克力不透明,而他们可以进行修改,以尽量减少紫外线穿透,将允许一些波长光线穿过的ABS的层,这可能导致褪色和脆化),易燃性,耐热性和时效要求等,可以影响的标志或符号组成的最终表现。 根据工作表的建设,各种各样的装饰效果可以达到。最常见的方法是共挤,利用不同的材料不同的挤出机,并结合在表中的层死亡。当保护层顶丙烯酸,非常明亮,深颜色可以生产,以及金属,花岗岩和珠光亮相。 丙烯酸的相对较薄的薄膜,它可以在几乎无休止的设计印刷,层压也很普遍。请记住,虽然,这层不透明的顶部是一个重要因素影响的抗紫外线能力。没有那么普遍,但在不断增加,是一个较厚的压克力贴合在ABS,提供大理石,花岗岩和金属的影响。应用但是,一如既往,没有完美的塑料。这些复合材料的性质要求他们在两个完全不透明的顶层和底层,所以使用仅限于非背光需求。为单位和热板的典型应用包括筋膜,为建筑标志,冠装饰及配件,装饰端盖条带化,热成型不透明的信件,信外壳(建制为背渠道字母或小如菜单板的迹象。但是,如果内表面暴露在有害的光线,它的当务之急,这表面是紫外线保护),以及其他应用。 ABS的随时借给自己相当复杂的真空成型形状,所以组织结构的要求和你的想象力是限制的因素。 相对较新的户外标识行业,丙烯酸和ASA - ABS的上限已使用多年的其他行业,特别是卫生洁具(浴缸,水槽,墙壁和周围),娱乐(池步骤,野营车的顶部和行李),以及运输(多用途车零部件,房车零部件等)。我们都在寻找办法来消除重涂漆的金属零件,玻璃钢,玻璃,木材和其他原料不够灵活。板材挤出机提供几个自定义的耐候ABS的变化为你考虑,虽然许多标志制造商不执行室内热成型,ABS是很熟悉的性能和零部件,可以很容易地转包。结论令人兴奋的设计,你的成功关键是将任何材料融入到你的设计,因为它总是应该是在最后的应用产品严格的测试。原料的选择,最终使用要求的定义,并与您的板材供应商充分协商是必要的。一旦在执行某些有没有缺陷,这些新一代复合材料可以是非常灵活,原文:John HirschNew uses fortraditional plastics PLASTICS IN THE SIGN INDUSTRY REPRINTED FROM THE IAPD MAGAZINE august/september 2001Sign manufacturers have historically relied on acrylic, impact-modified acrylic and outdoor grade polycarbonate when thermoformed faces or shapes are part of sign design. Over the past few years, the convergence of several technologies has enhanced the effectiveness of one of the most versatile thermoplastics high impact, easy-to-fabricate ABS (acrylonitrile-butadiene-styrene).This is where you say “Wait! ABS has very poor weatherability, and has to be painted to be used outdoors.” Although primary surface painting has long been the most common way to protect ABS, the advent of more sophisticated coextrusion capabilities, new resin developments, and improved thermoforming techniques has resulted in a breakthrough.By combining ABS sheet with a top surface layer containing more Uvstable plastics, most often an acrylic or ASA (acrylonitrile-styrene-acrylate) terpolymer, weatherability can be achieved.Unique balance of propertiesWhen properly specified and constructed, these composites can offer a unique balance of properties the formability, toughness and simplicity of fabrication of ABS and the inherent high gloss, ease of pigmentation and decoration, and great UV resistance of acrylics. It is vitally important, however, to discuss all end use parameters with your sheet suppliers. Many variables, including final part thickness (the thinnest section after forming), thickness and opacity of the top surface layer (clear acrylics, while they can be modified to minimize UV light penetration, will allow some light wavelengths to pass through to the ABS layer, which could result in fading and embrittlement), flammability, heat resistance and aging requirements, etc., can affect the final performance of the sign or sign component.Depending on the sheet construction, a wide variety of decorative effects can be achieved. The most common method is coextrusion, utilizing different extruders for the different materials, and combining the layers in the sheet die. When the protective top layer is acrylic, very bright, deep colors can be produced, as well as metallic, granite and pearlescent appearances.The lamination of relatively thin acrylic films, which can be printed in almost endless designs, is also widespread. Remember, though, that opacity of the top layer is a major factor influencing UV resistance. Less prevalent, but growing, is the lamination of a thicker acrylic to ABS, offering marble, granite and metallic effects as well.ApplicationsHowever, as always, there is no perfect plastic. The nature of these composites requires them to be completely opaque, on both the top and bottom layers, so use is limited to non-backlit requirements. Typical applications for both flat and thermoformed sheet include fascia, end caps for architectural signage, canopy decoration and components, decorativestriping, thermoformed opaque letters, letter housings (formed backs forchannel letters or small signs such as menu boards. But, if the inner surface is exposed to harmful light rays, its imperative that this surface be UV-protected also), and other nonlit applications. ABS readily lends itself to fairly complex vacuum-formed shapes, so structural requirements and your imagination are the limiting factors.Relatively new to the outdoor sign industry, acrylic- and ASA-capped ABS have been used in other industries for years, specifically sanitary ware (bathtubs, sinks, and wall surrounds), recreational (pool steps, truck camper tops and luggage), and transportation (utility vehicle parts, RV components, etc.). We are all searching for ways to eliminate heavy painted metal parts, FRP, glass, wood and other less flexible raw materials. Several custom sheet extruders offer variations of weather-resistant ABS for your consideration, and though many sign manufacturers do not perform inhouse thermoforming, ABS is very familiar to custom thermoformers, and partscan be easily sub-contracted.ConclusionThe key to successfully incorporating any material into your sign design is, as it always should be, stringent testing of the product in the final application. Raw material selection, definition of end use requirements, and thorough consultation with your sheet supplier are imperative. Once it is certain there are no flaws in implementation, these new generation composites can be very flexible andexciting in design.
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