车用PET/PP分散复合熔喷吸音材料的研究

本文采用分散复合融喷技术分别制得了PET/PP分散复合熔喷材料和羽毛/PP分散复合熔喷非织造材,研究了材料厚度、面密度、熔喷纤维平均直径对其吸引系数的影响,结果表明：吸声系数随着厚度的增加而增加;面密度对吸声系数影响较小,随着面密度的增加,样品的吸声系数也有所增加,但增幅较小;熔喷纤维平均直径在1.7~2.4μm内变化时对吸音系数无显著影响。另外,本文还进一步选用3M公司吸音产品和传统废纺毡吸引材料,对比分析了4种材料的吸音性能,结果表明：PET/PP分散复合熔喷吸音材料的吸音性能接近3M公司产品,而且其吸音性能优于传统车用废纺毡吸音材料及羽毛/PP分散复合熔喷非织造材料。     

先进的非织造布后加工工艺——TMF低面密度纤维喷胶技术

介绍了腾科系统技术有限公司的纤维喷胶技术及与其配套的热熔胶机。纤维喷胶技术尤其适用于大宽度的非接触式复合,是一项先进的、满足环保要求的非织造布后加工工艺。热熔胶机的设计特点保证了产品的优良透气性,胶量均匀,手感柔软,且设备调试方便、维修简单。     

汽车空调过滤用PET短纤热轧/熔喷复合非织造布的研究

文章将熔喷布与短纤热轧非织造布通过热轧技术进行了复合。首先,对熔喷工艺进行研究,以拉伸空气压力、接收距离和平动次数这三个影响因子为参数,以产品的面密度、厚度、纤维直径为表征量,得到最优工艺参数。其次,对热轧工艺进行优化。最后,在最优热轧工艺条件下,对所有样品进行热轧,并测试复合后样品的透气量、平均孔径、过滤效率和阻力。     

无溶剂复合能否攻破功能性薄膜复合难关?

信心+耐心+合作 无溶剂复合攻关指日可待 功能性薄膜对无溶剂复合工艺有一些特殊的技术要求,这些要求取决于包装内容物及其用途,主要体现在复合强度、耐高温性和耐介质性等几个方面. 目前,我国软包装企业在功能性薄膜复合方面主要采用的仍是干式复合工艺,而无溶剂复合工艺要想满足功能性薄膜的特殊要求,还需要经过大量的实验性测试,进行一些针对性的产品研发,尤其是在无溶剂复合胶黏剂方面,需要更多能够满足功能性薄膜复合要求的胶黏剂新产品推向市场.     

复合滤棒基棒搭口上胶系统的优化设计

为有效提高复合滤棒加工过程成型质量,提高设备效率,降低废品率,通过实验设计建立了热熔胶喷胶嘴口径与上胶宽度的回归模型,根据工艺要求求解喷胶嘴口径的最大值,进而采用双目标规划模型确定最佳喷胶嘴口径值,最后对优化后的复合滤棒外观质量和相关物理指标进行验证。结果表明:(1)随着喷胶嘴口径增加,设备效率先增后减,废品率先减后增。(2)最佳喷胶嘴口径值为1.5 mm,此时基棒搭口胶上胶宽度可达到1.95 mm。(3)与优化前相比,优化后复合滤棒外观质量缺陷率降低了36%,圆度、硬度物理特性有显著性改善,复合滤棒生产设备效率提升1.8百分点,废品率降低49.62%。     

棒状纳米氧化锌/聚丙烯抗菌非织造布开发

针对常规聚丙烯熔喷非织造布功能单一问题,将棒状纳米氧化锌与其复合开发新型熔喷材料,并对产品的抗紫外、隔音、力学性能、透气性、芯吸性能等指标进行检测。结果表明:复合产品抗紫外性能好,抗菌率、透气及吸湿性能有所提升,隔声性能好、力学性能与常规产品接近,可满足应用要求。     

喷胶系统介绍

折页机上为什么需要喷胶系统?这个问题的答案很简单,灵活的喷胶系统可以给折页机创造更多价值。例如很多直邮产品、照片袋、小册子、卡片等,都能直接通过喷胶系统在折页机上一次成型。喷胶系统也拓展了装订厂家的折页机使用范围,例如对开折页的产品,可以通过辅助喷胶固定产品的边角,固定后的产品能更好地在     

热熔胶系统在YP13条烟装封箱机上的应用

为解决YP13条烟装封箱机用胶带封箱导致封箱不紧实、无法满足机器人堆垛系统要求等问题,采用热熔胶技术对条烟装封箱机进行了改进:1增加了热熔胶系统,包括ProBlue热熔胶机及配套的输胶管和喷枪。2对热熔胶系统的控制系统和人机界面进行了集成设计。3经过测试,在烟箱侧面对4个小压盖各喷射两条40 mm长的胶线,工作温度为165℃,喷胶相位为86~91°和133~138°,喷胶效果最佳,可以将成品件烟的大压盖与小压盖牢固粘接。应用效果表明:有效解决了机器人将成品件烟堆垛时存在的外形超限、成品件烟被拉开、条烟散落等问题,故障次数由平均36次/周减少为0,保证了卷烟生产的顺利进行。     

铝塑热压复合技术在特种软包装生产中的应用

正传统干式复合工艺及无溶剂复合工艺都必须借助胶黏剂才能实现材料之间的复合,目前,这两种工艺在普通软包装复合加工中最便于实施,应用也最为广泛。但对于一些特种软包装产品(如高腐蚀性内容物)来说,胶黏剂的耐酸碱性、耐腐蚀性始终是影响复合膜质量的难题。那么,如何才能不去考虑胶黏剂的耐受性,而又能确保复合膜的使用要求呢?铝塑热压复合技术便可以解决。铝塑热压复合技术,是指在一定温度作用     

羊毛/竹炭纤维精纺花呢的设计开发

借助毛纤维柔软、弹性好,竹炭长丝吸湿透湿、抗紫外线特性定位夏季用轻薄精纺毛织物设计。通过控制竹炭纤维含量比例,并捻制成羊毛/竹炭长丝新型复合纱线,在满足面密度、紧度要求等条件下,选择平纹及变化组织与黑灰混色纱配合,合理设计工艺规格,制作同原料、同经纬紧度比、面密度接近的2款新产品。通过对织物测试与分析得出,产品质地轻薄、平整、手感滑爽、弹性好,混色风格独特,比较得出断裂强力、抗起毛起球性、抗紫外线性能、抗洗涤收缩能力较优产品。     

水刺非织造布专用涤纶短纤维的开发

分析了水刺工艺和水刺产品品质对原料涤纶短纤维的质量要求,介绍了调整生产工艺的方法以及用调整后的工艺生产的纤维质量。新开发的水刺专用短纤维品质优良,可较好地满足水刺工艺和产品的要求。     

益生菌微胶囊的制备及其在食品中应用的研究进展

益生菌对人体健康有益而被广泛应用于食品领域,但其易受温度、氧气、湿度、压力、胃酸和胆汁盐等不良环境因素影响。为使益生菌在加工、储藏、消化过程中保持高存活率,人们利用不同的微胶囊技术对益生菌进行包埋和保护。益生菌微胶囊技术通过创建一种物理屏障来提高益生菌对不良环境的抗性力,减少保护基质中益生菌的损伤,从而使其到达目标部位顺利释放并发挥作用。文章概述了益生菌的起源、种类及益生功效,重点总结了益生菌微胶囊常用制备方法的基本原理及优缺点,包括挤压法、乳化法、喷雾干燥法、冷冻干燥法、喷雾冷却法、复凝聚法、静电纺丝、电喷雾和撞击气溶胶法,进而重点讨论了益生菌微胶囊技术在乳制品、肉制品、非乳饮料及焙烤制品等食品中的应用优势和可能性。虽然众多研究进行体外模拟消化,但仍存在一定局限性,对于现有的问题,未来仍然需要通过扩大包埋方法、开展体内实验、建立系统性数据库等方法来满足益生菌食品的工业化生产需求,以为开发新型益生菌食品提供理论借鉴和参考。     

山葵酱的制备及货架期预测研究

为满足山葵酱市场的不同需求,解决其在贮藏、销售期间货架期短的难题,文章以模糊综合评判数学模型和菌落总数为标准,确定了“低温酱”和“常温酱”两种定位不同的山葵酱的加工工艺,并凭借Arrhenius方程对其货架期进行了预测。结果表明:“低温酱”以根茎为原料,在低温(0~4℃)条件下制备,并贮存于-18℃环境下,此条件下制备的“低温酱”的货架期约为944 d;“常温酱”以根茎和叶柄(1∶1,W/W)为原料,在室温(20~24℃)条件下制备,最佳防腐杀菌工艺为山梨酸钾添加量0.05%,热处理温度90℃,热处理时间30 min,此条件下制备的“常温酱”在室温(20~24℃)贮存的货架期约为323 d。上述研究结果可为山葵制品的开发及山葵酱的工业化生产提供理论指导。     

Emerging drying techniques for food safety and quality: A review

The new trends in drying technology seek a promising alternative to synthetic preservatives to improve the shelf-life and storage stability of food products. On the other hand, the drying process can result in deformation and degradation of phytoconstituents due to their thermal sensitivity. The main purpose of this review is to give a general overview of common drying techniques with special attention to food industrial applications, focusing on recent advances to maintain the features of the active phytoconstituents and nutrients, and improve their release and storage stability. Furthermore, a drying technique that extends the shelf-life of food products by reducing trapped water, will negatively affect the spoilage of microorganisms and enzymes that are responsible for undesired chemical composition changes, but can protect beneficial microorganisms like probiotics. This paper also explores recent efficient improvements in drying technologies that produce high-quality and low-cost final products compared to conventional methods. However, despite the recent advances in drying technologies, hybrid drying (a combination of different drying techniques) and spray drying (drying with the help of encapsulation methods) are still promising techniques in food industries. In conclusion, spray drying encapsulation can improve the morphology and texture of dry materials, preserve natural components for a long time, and increase storage times (shelf-life). Optimizing a drying technique and using a suitable drying agent should also be a promising solution to preserve probiotic bacteria and antimicrobial compounds.     

真空低温烹饪技术在水产品加工中的应用及展望

真空低温烹饪技术是指食品经真空包装后在精确的温度和时间控制下的烹调方法。相较于传统的烹饪方式,温度和时间的精确控制保证了食品良好的成熟度和质构,真空包装则更好地保留了食品的营养品质,并延长了食品的货架期。本文综述了真空低温烹饪技术的来源、国内外的发展过程和研究现状,及其在水产品加工中的应用,并结合当前该技术在我国存在的问题,列出了具体的应对策略,以期为更好地促进真空低温烹饪技术在水产品加工中的应用、开发满足消费者需求的即食水产品和实现真空低温烹饪水产品的工业化生产提供参考。     

QuEChERS-UPLC-MS/MS法测定鸡蛋中19种氨基甲酸酯类农药及其代谢物残留量

采用QuEChERS-超高效液相色谱-串联质谱法（UPLC-MS/MS）同时测定鸡蛋中的19种氨基甲酸酯类农药及其代谢物残留量。鸡蛋样品通过乙腈提取,分散固相萃取净化,UPLC-MS/MS测定。19种氨基甲酸酯类农药及其代谢物残留在0.2~50 ng/mL范围内线性良好（R2>0.999）,方法的检出限为1.0~10 μg/kg。在添加水平为10、20、50 μg/kg时,回收率为69.3%~107.6%,相对标准偏差低于9.21%。该方法简单快速,高效准确,回收率高,能够满足鸡蛋中19种氨基甲酸酯类农药及其代谢物残留检测与确证的需要。     

Feasibility of Spray Drying Concentrated Acid Whey After Nanofiltration

Concentration of acid whey and crystallisation of lactose followed by spray drying in the production of acid whey powder are severely restricted by the presence of lactic acid (LA) and calcium (Ca). These compounds cause stickiness during spray drying. The present study examined the effects of removing LA and Ca by membrane processing to varying extents in order to improve the feasibility of the spray drying of an acid whey stream. Spray drying of unaltered acid whey achieved a powder recovery of ~?18% in the collection vessel and ~?31% in the cyclone. Removal of LA and Ca by 30 and 40%, respectively, by nanofiltration significantly increased the powder recovery to ~?58% in the collection vessel. Powder particles decreased in size giving a D[4,3] of ~?18 μm, with SEM images confirming the presence of well separated spherical powder particles. A solubility of >?75% was also achieved. However, removing Ca >?60% compromised the spray drying process. FTIR analysis suggested that water molecules in the hydration layer of lactose and the structural changes of both lactose and protein molecules at the molecular level appeared to play an important role in governing the extent of the drying feasibility. In addition, the formation of calcium lactate may restrict the diffusion of lactose molecules, once the appropriate stoichiometry was reached. Thus, manipulating LA and Ca concentrations in a particular acid whey stream can improve the spray drying process and production of a non-sticky acid whey powder.     

Developing an interview guide to evaluate practice-based evidence in nutrition: use of the delphi technique

An interview guide was created for qualitative evaluation of the impact of Practice-based Evidence in Nutrition (PEN) on dietetic practice, and its success as a medium for knowledge translation and transfer (KTT). The Delphi technique was used to bring together a diverse group of experts (n=7) with extensive knowledge in KTT and evidence-based practice (EBP); these experts developed the interview guide content. The technique is an effective means of gathering expert input to inform evaluation tool development, particularly in the absence of accepted evaluation guidelines or pre-existing evaluation tools. Although challenges exist with the Delphi technique, it is an adaptable method that can be modified to meet a variety of needs. During this project, the technique was modified to meet specific needs, including participants' partial anonymity and starting material to reduce the number of required rounds. The resulting interview guide contained open-ended questions focused on respondents' understanding of EBP and PEN, use of PEN by dietitians in other disciplines, perceptions of the quality/usefulness of PEN, and barriers to and facilitators of PEN use.     

土工合成材料的产品开发

针对目前土工合成材料生产企业的现状 ,建议企业要开发有特色、有特殊功能、能满足具体工程要求的产品