真空冷冻干燥机节能途径浅析

真空冷冻干燥机在运行时产生较高的能耗.本文在概述真空冷冻干燥技术的基本原理和干燥过程的基础上,分析了影响真空冷冻干燥速率的主要因素,提出有效降低真空冷冻干燥机能耗的途径为:改变物料的形态和浓度、控制预冻速度和物料厚度、采用联合冻干工艺和改进真空冷冻干燥机设计,旨在为真空冷冻干燥机在实际应用中节能降耗提供借鉴.     

食品真空冷冻干燥过程工艺参数分析

针对目前国内冻干食品企业制定食品冻干工艺和食品冻工设备设计需要,系统分析了食品真空冷冻干燥过程的主要工艺参数及其之间的关系; 为冻干食品企业制定食品冻干工艺及食品真空冷冻干燥设备工程设计确定技术参数提供参考。     

冻干鲜花品质影响因素的研究

冷冻干燥法是一种相对较新的干花制作方法。为了探讨鲜花冻干技术中的主要影响因素,以金盏菊、康乃馨和玫瑰三种鲜花为素材,采用真空冷冻干燥技术分别进行了护色、预冻时间和升华干燥时间的单因素试验研究。研究结果表明,护色、预冻和升华干燥时间三种因素均对冻干花品质有显著影响。金盏菊经8h预冻,11h升华干燥,冻干后花瓣由单层变为双层,花型更饱满;康乃馨经8h预冻,13h升华干燥,冻干花品质最好;康乃馨和玫瑰经护色后形色较好且无鼓泡现象。利用冻干技术制作干花是可行的,且具有深入研究应用前景。     

鲜花真空冷冻干燥实验研究

为探索干燥花加工新技术,以月季、万寿菊和补血草为素材,利用冷冻干燥技术进行了冻干鲜花的实验研究。研究结果表明：采用真空冷冻干燥技术干燥较大的花朵植株,能够基本保持干燥花的形状、色泽和芳香;冻干后,红色的月季花颜色变深,而黄色的万寿菊颜色变淡;紫色的补血草颜色基本不变。采用真空冷冻干燥技术干燥鲜花是可行的。具有深入研究应用前景。     

食品真空冷冻干燥技术的现状及发展前景的探讨

本文综述了真空冷冻干燥技术在食品科学领域中的应用概况和食品用真空冷冻干燥设备的现状。探讨了食品冻干技术今后的发展前景。试图对我国食品冻干技术的发展、新型功能食品的开发和冻干设备水平的提高有所影响     

眼角膜真空冷冻干燥保护剂

离体生物组织的冻干贮藏是真空冷冻干燥技术应用的重要领域,而冻干生物制品的保护剂是冻干工艺中不可缺少的制剂。着重介绍了真空冷冻干燥眼角膜时所用保护剂种类、作用和保护机理。     

角膜真空冷冻干燥实验的传热传质分析

为保持角膜在真空冷冻干燥（以下简称冻干）过程中的活性,减少其内皮细胞的损伤,本文分析了冻干实验中前处理、预冻、干燥和复水检测等过程中,传热传质规律对角膜内皮细胞造成损伤的原因,在改进工艺参数的基础上,成功的冻干了合格的角膜。     

丝素/明胶三维多孔支架的构建及其结构和性能表征

应用冷冻干燥技术,在不同预冻温度下制备不同质量比例的三维多孔支架,用扫描电镜观察支架的微观形貌,X射线衍射仪分析其表面相结构,并测定了其吸水率、孔隙率和热稳定,观察不同质量比例和预冻温度对丝素(silkfibroin,SF)/明胶(gelatin,G)三维多孔支架结构和性能的影响。结果显示,通过改变材料的质量比例和预冻温度可以控制支架的孔隙形貌、吸水率和孔隙率,并且将丝素与明胶复合可以使支架的热稳定性提高,同时结构更加稳定。     

真空冷冻干燥技术在果蔬类食品加工中的应用现状

目的 为未来冻干技术在果蔬类及更多食品种类中更广泛的运用提供参考。方法 对近些年来真空冷冻干燥技术在果蔬类食品中的应用进行综述,探讨冻干过程中可能存在的问题,以及一些工艺优化措施。结论 尽管真空冷冻干燥技术的用价高昂,但近些年来由于消费者对少加工、高质量食品的需求,该项技术在食品行业中得到了愈发广泛的应用。近年来,预处理及一些创新技术的工艺强化能够有效地应对真空冷冻干燥技术面临的挑战,随着在线监控、品质智能监测等技术的引入,真空冷冻干燥得到了进一步的发展。     

真空冷冻干燥过程参数对玫瑰的冻干过程影响的试验研究

真空冷冻干燥技术是将含水物料在低温状态下冻结,然后在真空条件下,使冰直接升华成水蒸气并排掉脱水物料中的水分使物料干燥.因此真空冷冻干燥产品可以最大限度的保持新鲜物料的原有色、香、味.形和营养成分.本文通过对玫瑰花的真空冷冻干燥实验的分析,对影响真空冻干的过程参数进行了试验研究.试验表明隔板温度、干燥室真空度是很重要的两个参数;冻结速率对总冻干时间没影响.     

真空冷冻干燥技术及其在海产品加工中的应用

简述真空冷冻干燥技术的原理、冻干机结构和系统的组成、冻干工艺的操作过程及其在海产品加工中的实际应用,并根据多次物料的冻干过程制定最适宜的冻干工艺曲线,以供参考。     

眼角膜真空冷冻干燥设备的研制

本文讨论眼角膜真空冷冻干燥设备的结构特点、设计计算和冻干箱的温度分布。可用于各种离体生物组织的冻干实验研究。     

冷冻干燥法生产鸡肉丁的工艺研究

确定了鸡肉丁的冷冻干燥工艺条件，探讨了热烫、预冻速率、捕水器温度对制品品质与干燥时间的影响。建立了鸡肉丁冷冻干燥的传热传质模型，由模型计算出理论干燥时间，并与实验值进行了比较。     

ZDG40真空冷冻干燥机电加热系统

介绍了ZDG40真空冷冻干燥机电加热系统 ,该系统解决了冻干过程中干燥仓内真空放电问题 ,而且加热功率大 ,功率调节范围宽 ,可实现冻干过程的优化供能控制。     

食品真空冻干节能技术研究

综述了国外有关食品冻干节能技术研究的状况，其中较详细地归纳与分析了降温冻结过程对节能的影响，并指出冻干与其它干燥技术组合作业是当今一种新趋势。     

Bi-layered calcium phosphate cement-based composite scaffold mimicking natural bone structure

Abstract

In this study, a core/shell bi-layered calcium phosphate cement (CPC)-based composite scaffold with adjustable compressive strength, which mimicked the structure of natural cortical/cancellous bone, was fabricated. The dense tubular CPC shell was prepared by isostatic pressing CPC powder with a specially designed mould. A porous CPC core with unidirectional lamellar pore structure was fabricated inside the cavity of dense tubular CPC shell by unidirectional freeze casting, followed by infiltration of poly(lactic-co-glycolic acid) and immobilization of collagen. The compressive strength of bi-layered CPC-based composite scaffold can be controlled by varying thickness ratio of dense layer to porous layer. Compared to the scaffold without dense shell, the pore interconnection of bi-layered scaffold was not obviously compromised because of its high unidirectional interconnectivity but poor three dimensional interconnectivity. The in vitro results showed that the rat bone marrow stromal cells attached and proliferated well on the bi-layered CPC-based composite scaffold. This novel bi-layered CPC-based composite scaffold is promising for bone repair.     

ZLG—0.2型真空冷冻干燥机的研制

介绍了ＺＬＧ－０．２型真空冷冻干燥机和它的基本性能，给出了冻干箱和捕水器的设计计算方法。     

A casting based process to fabricate 3D alginate scaffolds and to investigate the influence of heat transfer on pore architecture during fabrication

The fabrication of 3-dimensional (3D) tissue scaffolds is a competitive approach to engineered tissues. An ideal tissue scaffold must be highly porous, biocompatible, biodegradable, easily processed and cost-effective, and have adequate mechanical properties. A casting based process has been developed in this study to fabricate 3D alginate tissue scaffolds. The alginate/calcium gluconate hydrogel was quenched in a glass mold and freeze dried to form a highly porous tissue scaffold whose tiny pores retain the shape of the ice crystals during quenching. Knowing that the water in the alginate hydrogel would form ice crystals if frozen and that different cooling conditions may dramatically influence the pore architecture, the speed and direction of the heat transfer in freeze drying hydrogel were examined with regard to pore size and orientation. The pore architecture at the different locations of the fabricated scaffolds was characterized using scanning electron microscopy. The fabricated scaffolds consist of pores that are highly interconnected, with a diameter about 200 µm (average diameter of a capillary) to permit blood vessel penetration. It also has been found that the pore size, orientation, and uniformity are significantly affected by the condition of heat transfer during freeze drying. Tailoring the pore architecture of the scaffolds is feasible by controlling heat transfer. This study provides an insight on pore architecture formation and control by altered process parameters.