A Novel System Design for Continuous Processing of Plastic/Wood-Fiber Composite Foams with Improved Cell Morphology
A Novel System Design for Continuous Processing of Plastic/Wood-Fiber Composite Foams with Improved Cell Morphology
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DOI：
10.1177/0021955x02038005786
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发表时间：
2002-09
影响因子：
2.5
通讯作者：
G. Rizvi;R. Pop-Iliev;C. Parky
中科院分区：
文献类型：
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作者：
G. Rizvi;R. Pop-Iliev;C. Parky
据信，在未干燥的木纤维中固有存在的水分不利地影响在挤出中加工的塑料/木纤维复合泡沫的泡孔形态。基于这一假设，实现基于连续挤出的具有理想质量的细孔塑料/木纤维复合泡沫的生产将强烈地取决于设计用于不间断地去除木纤维水分的系统的效率。本文提出了一种创新的方法来解决这个问题，实施著名的级联脱挥系统在化学发泡剂（CBA）为基础的生产塑料/木纤维复合泡沫。它包括一个水分蒸发串联挤出系统，在两个挤出机的互连处配备一个通风口，用于清除大气中的水分。为了检验新开发的系统的性能，实验研究已经进行了比较的泡孔形态和体积膨胀率的泡沫塑料/木纤维复合材料的混合物，通过加工相同的配方，同时使用级联脱挥发分串联挤出系统和相应的单挤出机无排气口。实验结果表明，使用级联脱挥串联系统生产的泡沫具有显着改善的泡孔形态和表面质量。
It is believed that the moisture that is inherently present in nondried wood-fibers adversely affects the cell morphology of plastic/wood-fiber composite foams processed in extrusion. Based on this hypothesis, achieving a continuous extrusion-based production of fine-celled plastic/wood-fiber composite foams witha desirable quality would be strongly conditioned by the efficiency of the system designed for uninterrupted wood-fiber moisture elimination. This paper presents an innovative approachin addressing this problem by implementing the well-known cascade devolatilizing system in a chemical blowing agent (CBA) based production of plastic/wood-fiber composite foams. It comprises a moisture-evaporation tandem extrusion system equipped witha vent at the interconnection of the two extruders to serve for purging the moisture in the atmosphere. In order to check the performance of the newly developed system, an experimental study has been carried out for comparing the cell morphology and the volume expansion ratios of the foams obtained by processing identically formulated foamable plastic/wood-fiber composite mixtures using simultaneously the cascade devolatilizing tandem extrusion system and a corresponding single extruder withno vent. The experimental results revealed that the foams produced by using the cascade devolatilizing tandem system exhibited significantly improved cell morphologies and surface quality.