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首页> 外文会议>9th Annual Global Plastics Environmental Conference (GPEC) Feb 26-27, 2003 Detroit MI >A Plasticating Screw Design for the Reprocessing of Multi-layer or Multi-material Plastic Items
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A Plasticating Screw Design for the Reprocessing of Multi-layer or Multi-material Plastic Items

机译：用于多层或多材料塑料制品再加工的塑化螺杆设计

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摘要

Recycling or reprocessing of "multi-layer" or "multi-material" plastic products is a particular problem for plastic compounders or recyders. Examples of multi-layer plastic products include painted or coated plastic items, such as automotive body panels, or multi-layer plastic packaging, such as that used in high barrier applications. In each of these cases, the coating or multi-layer structure is utilized to enhance either the product's overall performance or appearance. Unfortunately, the presence of other material layers will generally have a negative impact on the recyclability of the primary thermoplastic material as they often act as incompatible contamination. For example, most of the paints or coatings used to paint plastic parts are thermosetting in nature and act as solid paniculate inclusions in the recycled matrix material. Methods to remove coatings from coated plastic parts have been developed, but are not always cost effective. Similarly, separating multi-material or multi-layer structures may or may not be technically feasible depending on their specific construction. As an alternative, these complex material constructions can sometimes be effectively recycled if the contaminating layers can be reduced in particle size and effectively mixed into the continuous thermoplastic matrix material. A single screw mixing or "grating" section has been designed and evaluated experimentally in this study. Experimental trials were conducted using reground, painted thermoplastic olefin automobile bumpers. The reground bumper scrap was extruded using a single screw equipped with this grating sections, and several more conventional extrusion screw designs. The paint flake size distribution of the extrudate, and the physical properties of samples molded from the extrudate were evaluated for each screw design, both with and without melt filtration.
机译：对于塑料混料机或回收机，“多层”或“多材料”塑料产品的回收或再加工是一个特殊的问题。多层塑料产品的示例包括油漆或涂层塑料制品，例如汽车车身面板，或多层塑料包装，例如用于高阻隔应用的塑料包装。在每种情况下，都使用涂层或多层结构来增强产品的整体性能或外观。不幸的是，其他材料层的存在通常会对主要热塑性材料的可回收性产生负面影响，因为它们经常充当不相容的污染物。例如，用于油漆塑料零件的大多数油漆或涂料本质上都是热固性的，并且在回收的基质材料中起固体颗粒状内含物的作用。已经开发了从涂覆的塑料部件上去除涂层的方法，但是并不总是具有成本效益的。类似地，取决于它们的具体构造，分离多材料或多层结构在技术上可能是可行的或可能不是可行的。作为替代方案，如果可以减小污染层的粒度并有效地混入连续的热塑性基质材料中，则有时可以有效地回收这些复杂的材料构造。在本研究中，已经设计并通过实验评估了单螺杆混合或“磨碎”部分。使用重新研磨，上漆的热塑性烯烃汽车保险杠进行了试验。使用配备有该格栅部分的单螺杆和几种其他常规的挤出螺杆设计，将磨碎的保险杠废料挤出。对于有和没有熔体过滤的每种螺杆设计，均评估了挤出物的油漆薄片尺寸分布以及由挤出物模塑的样品的物理性能。

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