聚酯切片的结晶──干燥

对聚酯切片的结晶─干燥工艺要求、影响干燥速度和干燥切片含水量的因素等进行了讨论,指出干燥速度决定於干燥的温度,切片干燥后的含水量则决定於环境的温度（以露点高低表征）,从结晶熔点工艺温度关系说明了充填型干燥设备结块问题。     

碱溶性聚酯切片的结晶与干燥性能研究

通过对碱溶性聚酯切片在三种不同结晶工艺条件下的结晶性能的研究实践,分析了三种结晶方式工艺控制及其特性,并对结晶后碱溶性聚酯切片的干燥工艺控制及其影响条件进行研究分析,使连续结晶、干燥后的碱溶性聚酯切片能满足海岛纤维生产的工艺要求。     

改造干燥设备降低聚酯切片含水率

涤纶长丝生产线中的干燥设备性能极大地影响着生产的正常进行。聚酯切片干燥机均使用干空气作为干燥介质。根据使用气源的不同分为“高压 (压缩空气 )小风量”及“低压 (风机供气 )大风量”两种机型配置。国外机都采用压缩气源 ,国产机两种都有。南通合成纤维厂先后投产的多条生产线中配置有Zimmer干燥塔、罗森干燥塔、国产低压大风量充填干燥塔。其中Zimmer公司干燥机已使用2 0多年 ,由于设备中相关配套设备老化、性能下降 ,经常需要维修 ,影响产品开发。国产干燥塔采用低压大风量 ,使用性能不理想 ,配置在FDY生产线造成生产不正常 ,影响…     

BM新型干燥设备——应用吸附式除湿机的干燥装置

从切片干燥设备的发展概况及BM干燥设备的改进过程出发,着重阐述了脉冲输送系统、结晶干燥系统的工艺流程及工作原理,并分析了主体设备的结构,最后给出了该机型的特点。     

K.F干燥装置中聚酯切片预结晶工艺探讨

本文通过生产实践,对Karl Pischer's(缩写K.F)聚酯切片干燥装置生产过程中影响切片预结晶质量的主要工艺参数进行了分析探讨。     

关于“聚酯切片干燥除湿机”的研究

本文介绍采用压缩空气作气源,经国产冷冻干燥机和分子筛无热再生吸附二级除湿,获得露卢、温度-80℃低露点干空气.供聚酯切片干燥,可获得含水率为20±5PPm的干切片.     

两种聚酯切片干燥方式的比较及应用实践

介绍了聚酯切片纺丝工艺中较为常见的2种切片干燥方式——预结晶充填干燥和真空转鼓干燥,比较了它们的优缺点,并通过实例说明,在不同的生产规模及生产条件下,应根据实际情况,合理选用切片干燥方式,以满足生产要求。     

瓶用聚酯切片结晶性能研究

通过对2种不同瓶用聚酯切片（市售瓶用聚酯切片和辽阳石化公司的瓶用聚酯切片）进行傅里叶变换红外光谱、热失重、热台偏光显微镜、差示扫描量热等的对比分析,详细研究了2种瓶用聚酯切片的结晶行为。结果表明,瓶用聚酯切片应具有适中的结晶能力,结晶速率过大或结晶度过高均可导致聚酯瓶产品的耐热性能下降;与市售瓶用聚酯切片相比,辽阳石化公司的瓶用聚酯切片的结晶速率较大,具有较高的热结晶温度。     

用于生产碱溶性聚酯切片的联合设备的开发

针对碱溶性共聚酯(COPET)的特点,设计开发了双风道FBM330型结晶、干燥联合设备,讨论了双风道结晶、干燥系统在COPET切片结晶、干燥过程中的工艺流程及控制参数,指出该设备同样适合于大有光阳离子可染切片的结晶、干燥的生产。     

釉料化学组成与温度制度对锌黄长石析晶的影响

本通过大量的配方实验和OM、XRD分析,系统研究了R2O－CaO-ZnO-Al2O3-SiO2系统锌黄长石析晶与组成和热处理温度间的相互关系。研究结果表明锌黄长石在0．2R2O-CaO-ZnO-Al2O3-SiO2系统中主要以羽毛状晶型析出,对析晶温度不敏感,在低硅低铝区可以形成数毫米大小的大晶花,可用于生产新型锌黄长石结晶釉;锌黄长石相主要在ZnO,CaO含量适中的组分中析出。在ZnO含量为0．55摩尔的系统中,用Na2O等摩尔取代K2O有减小锌黄长石相析晶区的趋势,但在ZnO含量为0．35摩尔的系统中则相反;在R2O拴部由0．20mole K2O引入的组分中,白榴石析晶消耗足够量的Al2O3有利于锌黄长石的析晶。     

水合氯醛结晶工艺研究

通过实验对水合氯醛的结晶工艺进行了优化研究,获得最佳工艺条件为：萃取剂氯仿加入温度为50℃,氯仿加入量与三氯乙醛和水的混合液体积比为1：1,结晶时间为5～6h。按上述工艺条件生产的产品为无色透明结晶颗粒,质量达到英国药典BP93标准。萃取剂氯仿可循环使用,从而降低生产成本。     

Non-Isothermal Drying of Medicinal Plants

An intelligent system for non-isothermal drying of medicinal plants, based on machine vision, sensor fusion, and neural network, was developed. Air temperature, velocity, and humidity, along with material size and moisture content were inputs to the neural model for diffusivity. Temperature, time, mass, volume, and color were inputs to the neural model for quality. Isothermal low-temperature drying of ginseng root and blueberry showed extremely low effective diffusivity (0.2–0.75)*10^?10 m²/s. In contrast, non-isothermal drying demonstrated a potential to increase diffusivity and prevent quality losses. Testing of the intelligent drying system showed reduced drying time from 240 to 60 hours for ginseng, and from 110 to 30 hours for blueberry with desired product quality.     

Analysis of Drying Kinetics and Moisture Distribution in Convective Textile Fabric Drying

The drying process of crude cotton fabric is analyzed under two main aspects: analysis of moisture distribution inside the textile sheet, and analysis of certain operational convective drying process variables. Experimental apparatus consisted of a drying chamber in which samples of pure cotton textile were suspended inside the drying chamber and exposed to a convective hot air flow. The influence of the operational variables on the drying process behavior was studied by two different ways with generalized drying curves. The behavior of moisture distribution profiles was compared to average moisture content of the textile fabric verifying whether average values were able to represent the textile moisture content during the drying process.     

Analysis of Moisture Content and Density of Pears During Drying

Solar dried pears of the “S. Bartolomeu” variety are a very much appreciated and preferred dried food product in Portugal. Nevertheless, the traditional solar drying is carried out at open air during the months of 07 and 08, and this nowadays is a disadvantage for larger productions. This work is to evaluate the possibility of producing dried pears from this and other varieties, maintaining the characteristics of the traditional dried pears. In this study four different types of pears were studied, including “S. Bartolomeu” as a basis for comparison and the drying method employed was the traditional one. From the results it was concluded that, although the behaviour of the four varieties do not vary significantly, one particular variety (“D. Joaquina”) is a good alternative to the “S. Bartolomeu” pear.     

Analysis of Moisture Content and Density of Pears During Drying

Abstract

Solar dried pears of the “S. Bartolomeu” variety are a very much appreciated and preferred dried food product in Portugal. Nevertheless, the traditional solar drying is carried out at open air during the months of 07 and 08, and this nowadays is a disadvantage for larger productions. This work is to evaluate the possibility of producing dried pears from this and other varieties, maintaining the characteristics of the traditional dried pears. In this study four different types of pears were studied, including “S. Bartolomeu” as a basis for comparison and the drying method employed was the traditional one. From the results it was concluded that, although the behaviour of the four varieties do not vary significantly, one particular variety (“D. Joaquina”) is a good alternative to the “S. Bartolomeu” pear.     

府谷半焦干燥特性研究

针对炼焦工艺及熄焦方式不同导致焦炭含水率波动较大问题,以府谷半焦为原料,进行半焦干燥实验研究,考察了粒径、干燥温度、有无鼓风、堆积厚度等因素对半焦干燥速率的影响。结果表明,在恒定的干燥条件下,粒径越小,干燥速率越快。若将半焦粒径从50 mm减小到10 mm,则焦炭含水率干燥至1%所需干燥时间由57 min降至31 min;干燥温度降低,干燥初始阶段的调整期延长,干燥速率迅速下降,水脱除量急剧减少。因此,为保证较快的干燥速率,干燥温度应控制在200℃以上为宜;增加鼓风,降低堆积厚度有助于提高干燥速率,通过鼓风方式干燥可将脱水率提高23%。     

采用远红外加热技术干燥聚酯切片

介绍了采用远红外线加热干燥含水切片的试验过程,分析了此项技术的可行性。通过试验测试了不同的加热温度、料板距离和干燥时间对干燥后切片含水率的影响。试验结果表明,采用远红外线加热干燥后的切片含水率是可以达到螺杆挤压机纺制聚酯短纤维和熔喷非织造布的工艺条件和技术要求的,从而扩大了远红外线的应用范围。