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首页> 外文期刊>Chemical Engineering Research & Design: Transactions of the Institution of Chemical Engineers >Extrusion-cooking of starch protective loose-fill foams
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Extrusion-cooking of starch protective loose-fill foams

机译：Extrusion-cooking淀粉防护松散泡沫

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摘要

One of the most interesting alternatives to EPS is extrusion of starch-based materials. TPS-based biocomposites can be processed, in a one-step process, via an extrusion-cooking. Wide program of the experimental works with application of extrusion-cooking for production of starchy loose-fill foams has been started in the Department of Food Process Eng., Lublin University of Life Sciences in 2012. The object of the study is to achieve commercially acceptable biodegradable products based on locally produced potato, corn and wheat starch, which can replace popular EPS. Results of the firstphase of the study are presented in the paper. The measurements of glass transition temperature of TPS samples showed that with glycerol content growth in the blend, the Tg of the obtained material decreases almost linearly. In the case of potato TPS, the highest observed Tg was 187.7 °C for 7.0% glycerol and the lowest was at 18.1 °C for 30% glycerol. Properties of the loose-fill foams highly depend on raw materials and process parameters used in production. In addition of plasticiser or other additives, different temperature of processing is causing changes in product's properties. All starch-based foams had high open-cell content and the expansion was attributable to the escape of water as steam during processing, resulting more than 80% open cells. The foam density of starch-based products ranged between 18.7 and 30.5 kg/m3. The products were at least 2.5 times more dense than EPS-based foams. The best products achieved by us up till now are the corn TPS-based foams containing 3% plasticizer and 1% poly-vinyl alcohol. The energy consumption during extrusion-cooking depended on the material composition of the blends, temperature and the screw rotation speed used during processing. Average value of SME was about 2.52 x 10~5 J/kg, which is equivalent to 0.07kWh/kg.
机译：最有趣的一个替代EPS淀粉基材料的挤压。biocomposites可以加工,一步过程中,通过一个extrusion-cooking。实验与应用程序的工作extrusion-cooking生产的淀粉松散泡沫已经开始食品过程中。2012年大学生命科学。的研究是实现商业化可接受的基于生物可降解产品当地生产的马铃薯、玉米和小麦淀粉、它可以取代受欢迎的每股收益。firstphase研究提出的纸。TPS的样本显示,温度甘油含量增长的混合,Tg的获得的材料几乎线性减少。TPS的土豆,观察到最高Tg是187.7°C 7.0%甘油和最低的18.1°C的30%甘油。松散泡沫高度依赖于原始材料和工艺参数生产。添加剂、不同温度的处理造成产品性能的变化。淀粉基泡沫开孔含量高,扩张是归因于的逃避水和蒸汽处理过程中,产生更多超过80%开放的细胞。淀粉基产品介于18.7和之间30.5千克/立方米。比EPS-based泡沫密度。产品通过我们到目前为止都是玉米利用泡沫塑化剂含有3%和1%聚乙烯醇。extrusion-cooking取决于材料温度和成分的混合螺杆转速加工过程中使用。中小企业的平均值2.52 x 10 ~ 5 J /公斤,相当于0.07千瓦时/公斤。

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