利乐无菌包装产品加热方法的研究

提出一种加热利乐无菌包装产品的方法;结合实验指出:用电磁感应法加热利乐无菌包装产品具有的适用性和众多优点.该加热方式可用来指导新加热装置的开发,以满足加热利乐无菌产品的社会需求.     

纸塑铝复合包装材料各组分共热解行为研究

以用甲酸分离枕型利乐包所得的纸、聚乙烯、铝作为实验材料,采用热重红外联用(TG-FTIR)分析技术,研究了各组分在热解过程中的协同作用,以探索纸塑铝复合包装各组分共热解机理,为实现废弃利乐包材料的资源化利用提供科学参考和实验依据。结果表明:共热解时纸和聚乙烯之间存在协同作用,在失重峰位置表现得尤为明显;铝在共热解时具有一定的催化作用,在反应的不同阶段起到了相应的促进或者抑制热解的作用。     

纸塑铝复合包装材料各组分共热解产物分析

以甲酸分离枕型利乐包所得的纸、聚乙烯、铝作为实验材料,使用热重红外联用(TG-FTIR)分析技术,研究了单一组分热解产物特性和组分共热解机理。结果表明:共热解时纸和聚乙烯之间存在协同作用,且在TG-FTIR失重峰位置附近产生的影响尤为明显;铝在共热解时具有催化剂的作用,会促进聚乙烯的分解。为实现废弃纸塑铝复合包装材料的资源化利用提供科学参考和实验依据。     

对我国废弃利乐无菌包回收利用的探讨

废弃利乐包造成的资源浪费以及环境污染问题是当前需要解决的问题。分析了国内外废弃利乐包回收利用状况,指出欧盟及美国等发达国家已制定了相对完善的废弃利乐包回收法规,欧盟一些国家对废弃利乐包的回收率高达70%以上。我国虽然已有专门从事废弃利乐包回收的企业,但回收体系不完善,相应的法规不健全,废弃利乐包的回收率不到20%,利乐包的回收产业需要政府的推动、相关立法的帮助和全社会的关注与配合,应通过制定相关政策法规、减少利乐包的生产数量、建立合理的物流回收处理体系等措施,提高废弃利乐包的回收率。     

不同工艺制备利乐粉/HDPE阻燃木塑复合材料的研究

研究了不同工艺对阻燃利乐粉/高密度聚乙烯(HDPE)复合材料的阻燃性能和力学性能影响。实验结果表明:热压法制备利乐粉/HDPE阻燃木塑复合材料的最佳工艺条件是加压时间15 min,温度为160℃,压力为10MPa,利用最佳工艺条件制成的样品,氧指数可达28.31%,弯曲强度为44.17 MPa,拉伸强度为16.98 MPa;对比热压法和注塑法,注塑法制备的阻燃木塑复合材料具有更良好的力学性能和阻燃性能,且注塑法制备的复合材料燃烧残余物的炭层更致密和稳定;SEM和FTIR分析表明挤出注塑法和热压法制备的阻燃木塑复合材料燃烧残余物的红外图谱的峰与设计目标产物的特征峰一致,材料具有阻燃性。     

Free and bound phenolic compounds in leaves of pak choi (Brassica campestris L. ssp. chinensis var. communis) and Chinese leaf mustard (Brassica juncea Coss)

Eleven pak choi cultivars and two leaf mustard cultivars grown under field conditions in China were investigated for the free polyphenol content in their outer and inner leaves, as well as in their leaf blades and leaf stalks. In most cases, there were no significant differences between the hydroxycinnamic acid derivative and flavonoid derivative contents in the outer and inner leaves for the 13 cultivars. However, the contents of blades and stalks differed: hydroxycinnamic acids and flavonoids were present in greater amounts in the leaf blade than in the leaf stalk. Trace or small amounts of flavonoids were detected in the pak choi and leaf mustard stalks. Additionally, the bound phenolic contents of two pak choi cultivars and two leaf mustard cultivars were investigated. The concentrations of cell wall-bound phenolic compounds were higher in the leaf blade than in the leaf stalk under field conditions in China. These compounds represent only a minor portion of the total phenolic contents (flavonoids and hydroxycinnamic acids) in leaf stalks (0.81–1.18%) and leaf blades (0.05–0.08%) from fresh plant material. The storage of plant samples from four Chinese cabbage cultivars resulted, in most cases, in an increase of phenolic content, within six days, at 4 °C and 20 °C. The increase might have been triggered by post-harvest plant stresses, which stimulate the biosynthesis of polyphenols.     

"利乐包"塑木托盘的有限元分析

采用塑木挤出成型技术,将打碎的"利乐包"挤压成型,选择其板材加工成托盘。根据林派检测报告相关数据:弹性模量、静曲强度以及塑木材料弯曲强度,基于ANSYS有限元分析软件,对托盘板材在静态承重与叉车叉起时的力学性能和承载性能进行分析。结果表明:1.1 t的承载下,板材不会开裂,满足实际使用要求。     

基于USB接口的数据采集卡在UHT纸盒奶检测仪中的应压

UHT纸盒奶检测仪是基于流体力学的运动原理，利用电子、物理方法设计研制的，适用于不同砖型纸盒包装的超高温灭菌牛奶产品的虚拟检测仪器。本文介绍了在UHT纸盒奶检测仪中，LabVIEW环境下，如何使用USB接口的数据采集卡，进行数据采集以及控制步进电机。通过试验证明该系统达到了设计要求。     

青菜脱水工艺复水的研究

研究青菜干制品饱满度及干制品的复水性能。在烫漂3min后，浸入15％糊清＋15％蔗糖＋10％盐溶液30min，关在含水量70％时给予30－40kgf力1min的挤压，可显著提高青菜干制品复水率，与对照相比，可提高85％。