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1.
热处理过程对PLA薄膜阻隔性能的影响   总被引:1,自引:1,他引:0  
周刚 《包装工程》2017,38(19):87-91
目的研究不同热处理对PLA薄膜阻隔性能的影响。方法对用PLA和PE薄膜包装好的食品模拟物进行不同的热处理,分析热处理后PLA和PE薄膜氧气透过量、吸水能力、水分透过量的变化。结果热处理前的PLA和PE薄膜的氧气透过量分别为3737.27和1469.54 cm3/(m2·d·Pa),热处理后因PLA和PE薄膜出现缺陷,在透气性测试仪中测量不出数据。PLA薄膜的水分透过量在80~124g·cm/(cm2·s·Pa)之间,PE薄膜的水分透过量在4.9~29.6 g·cm/(cm2·s·Pa)之间。在蒸煮加热时,当储存时间为3周时,PLA的拉伸强度、透湿量、吸水率都会减小。结论传统的蒸煮加热消毒对PLA的阻隔性能影响最大,不适用于需要蒸煮消毒的食品包装材料。在预测食品货架期时,不应忽视消毒方式对包装材料性能产生的影响。  相似文献   

2.
介绍了目前YBB标准对药包材阻隔性能测试的方法及要求,分别列出了几种方法的特点及注意事项,并对新的检验方法进行了说明。  相似文献   

3.
张目清 《中国包装》2008,28(4):45-46
Labthink兰光作为协作单位参与了国家认监委组织的塑料包装材料阻隔性能测试能力验证项目,并出色地完成了检测试样均匀性、稳定性的重要工作。本文具体介绍了在本次能力验证项目中样品的选择以及进行样品均匀性、稳定性检测的方法和意义。  相似文献   

4.
(上接《塑料包装》2012年第5期)2012年,BOPP薄膜生产企业要大力开发新产品,加强功能性薄膜的开发和应用,开拓新的应用领域。BOPET薄膜具有平整性好、密封性优、耐高温、抗拉强度高、透明度和光泽性好等优点,常被用以复合膜的表层和中间层膜。BOPET薄膜耐化学腐浊的特点,使得容易进行真空镀铝和表面涂布化学改性,从而提高其热封性、阻隔性和印刷的附着力,适用于蒸煮、低温冷冻、耐油性和耐化学  相似文献   

5.
水声透声材料发展概述   总被引:1,自引:0,他引:1  
张春园  孟庆杰  闻婷婷  齐庆  郭世峰 《材料导报》2018,32(Z2):140-142, 150
概述了水声透声材料的透声机理,声阻抗和透声层厚度为影响材料透声系数的主要因素。阐述了水声透声材料在声纳导流罩中的应用,并探讨了金属、橡胶和玻璃钢导流罩的优缺点。利用理论计算指导材料结构设计,从提高材料透声性能、材料密封性和耐海洋环境性三个方面综述了水声透声材料的研究进程。提出丰富、完善水下透声材料性能的计算模型,开发性能均衡的透声材料,以及研制全壳体声纳导流罩是水声透声材料研究和应用的发展方向。  相似文献   

6.
目的简化热成形模具水路密封性的检测方法,减少人力、设备、时间成本。方法开发制造一种模具水路密封性检测装置,模拟生产设备冷却系统环境,检测热成形模具水路的水密性以及对模具水路中的杂质进行清洗。结果检测装置可以对模具水路循环系统的流速和流量进行监控,对模具水路密封性进行检测,缩短模具制造周期,提高制造成本。结论装置实现了前期对模具水路密封性检测的需求,简化了模具水路密封性检测的过程,释放了原有设备产能,减少了人力、设备、时间成本,达到了装置开发的目的。  相似文献   

7.
本文简单介绍了水汽透过率测定仪的工作原理,参考GB/T 1037-88《塑料薄膜和片材透水蒸气性试验方法 -杯式法》,[1]利用水汽透过率测定仪对水汽透过量进行测量,并以此建立了测量模型,对水汽透过量的测得值进行了不确定度分析和评定。  相似文献   

8.
简述了不同相对湿度下镀铝薄膜的水蒸气透过性测试结果的差异,分析其原因。  相似文献   

9.
阻隔性能检测应用范围广泛,LABTHINK兰光2014年春季塑料薄膜阻隔性能实验室间比对以塑料薄膜为试样,对现阶段的阻隔性能检测水平进行验证。通过对结果的统计分析,可以看出,现阶段我国塑料薄膜阻隔性能整体检测水平尚属理想,但是检测结果仍具有一定的离散性,部分实验室可疑或离群。在目前阻隔性能检测缺乏统一校准规范的情况下,建议实验室积极进行实验室间数据比对,以使自身实验室数据保持在合适的水平。  相似文献   

10.
《塑料包装》2020,30(1):41-50
前言本标准按照GB/T 1.1—2009给出的规则起草。本标准代替BB/T 0030—2004《包装用镀铝薄膜》。本标准与BB/T 0030—2004相比,除编辑性修改外主要技术变化如下:——修改了标准的英文名称;——修改了规范性引用文件(见第2章,2004年版的第2章);——修改了术语和定义(见第3章,2004年版的第3章);——修改了镀铝薄膜的外观要求(见5.1,2004年版的5.1);——修改了镀铝薄膜的尺寸及偏差要求(见5.2,2004年版的5.2);——修改了镀铝薄膜的断裂标称应变、热收缩率、水蒸气透过量、氧气透过量和镀铝层附着力要求(见5.3,2004年版的5.3).  相似文献   

11.
用复合材料制造炼镁还原罐的技术进展   总被引:1,自引:0,他引:1  
简述了炼镁还原罐制造技术的概况,提出了以低镍耐热钢为基体,高温喷涂陶瓷类材料涂层的还原罐制造方案,指出用复合材料制造还原罐的技术研究是提高还原罐使用寿命的努力方向。  相似文献   

12.
Seer fish in curry medium packed in locally manufactured retort pouches, having a three‐layer configuration of thickness 12.5 µm polyester/12.5 µm aluminium foil/80 µm cast polypropylene was processed in a steam/air mixture over a pressure retort. About 210 g fish curry, having 110 g fish slices, was packed in a retort pouch of size 17 cm × 15.5 cm, each fitted with a thermocouple. Time–temperature data were collected during heat processing using an Ellab data recorder FO and cook value integrator. The heat penetration characteristics were determined using a mathematical method. The fh value was 25 min with a FO value of 11.5 and cook value of 95 min. These samples remained in good condition for up to 24 months at room temperature. Copyright © 2002 John Wiley & Sons, Ltd.  相似文献   

13.
着重分析了目前普遍存在的高温蒸煮袋破袋的原因,重点探讨了原材料、胶粘剂、复合工艺参数、制袋工艺参数的影响,提出一些控制破袋破袋不良现象出现的建议方法,为提高产品质量,对生产工艺的改进提供参考。  相似文献   

14.
This study described a micro initiator realized by reactive Ni/Al nanolaminates. A self-propagating reaction can be triggered in the Ni/Al film by applying a DC voltage of 1.5?V. This exothermic reaction can raise the temperature of the film (10?μm in thickness) surface to as high as 622?K. The measured ignition power to start the self-propagating reaction in the film was 3?mW with an ignition delay of around 0.63?s. The small ignition energy required and the large energy output make the Ni/Al film superior to the current resistive heater based initiators. Numerical simulation results demonstrated that different temperatures can be achieved by simply alternating the film thickness and the localization of high temperature exposure was realized to avoid unintentional fire of adjacent initiators. These findings were confirmed by the experiment using thermal indicators.  相似文献   

15.
本文所采用的包覆液具有良好的润湿性能。在粉末表面形成含有Cr、P元素的玻璃相结构的均匀薄膜,具有较高的电阻率和良好的耐热性能。讨论了粉末表面的光滑度对包覆效果的影响以及磁粉芯的品质因数Q和导磁率μ及绝缘介质含量之间的关系。  相似文献   

16.
Heat processing semi-rigid packages with a steam/air mixture requires an overpressure to ensure seal integrity. A method was developed to calculate the overpressure needed to ensure seal integrity, during thermal processing, of semi-rigid packages that contain a liquid food or drug. An equation was derived relating total retort pressure (steam and air) required during sterilization to retort temperature, product water activity and tensile seal stress at the sterilization temperature. The proposed method was tested, under commercial sterilization conditions (123–127°C for 30min), with individual packages containing a dilute saline solution. The method was found useful for predicting the total retort pressure (steam and air overpressure) needed to ensure seal integrity and to prevent leakage of packages.  相似文献   

17.
渗铝件焊接熔合区的组织与性能   总被引:1,自引:0,他引:1  
研究了渗铝件焊接熔合区的组织与性能。结果表明:熔合区内形成金属化合物,并具有很高的耐高温氧化性。蒸馏釜底部加热区焊接渗铝薄板后,使用寿命提高6倍。  相似文献   

18.
Wide bandgap semiconductor materials provide superior electrical, optical, and thermal properties that classical semiconductors, Si and GaAs, are unable to achieve. However, most commercially available substrates have large lattice and thermal expansion mismatches to III-nitrides films. Thus a high quality buffer layer, grown at low temperatures, is essential in growing high quality III-nitride films. This research provides a throughout study on III-nitrides, such as AlN, GaN and AlGaN thin films, which were grown at low temperatures (400–600 °C). Growth rate, stoichiometry and crystal structure of low temperature growth films will be reported by using several advanced post-growth analysis techniques. Temperature, pressure, and V/III molar ratio were also investigated to determine their effect on the film properties. From the study, a better understanding of the relationships between film properties and growth parameters will be achieved.  相似文献   

19.
硅靶中频反应磁控溅射二氧化硅薄膜的特性研究   总被引:8,自引:1,他引:7  
报道了中频双靶反应磁控溅射制备二氧化硅(SiO2)薄膜的装置、工艺及薄膜特性。对制备的SiO2薄膜的化学配比和元素化学态进行了SAM和XPS分析,测试了膜层对钠离子(Na^ )阻挡性能、光学折射率和可见光的透过率。研究表明作者开发的中频双靶反应磁控溅射沉积SiO2薄膜的设备和工艺可以高速率、大面积制备高质量的SiO2膜。  相似文献   

20.
By fine‐tuning the crystal nucleation and growth process, a low‐temperature‐gradient crystallization method is developed to fabricate high‐quality perovskite CH3NH3PbBr3 single crystals with high carrier mobility of 81 ± 5 cm2 V?1 s?1 (>3 times larger than their thin film counterpart), long carrier lifetime of 899 ± 127 ns (>5 times larger than their thin film counterpart), and ultralow trap state density of 6.2 ± 2.7 × 109 cm?3 (even four orders of magnitude lower than that of single‐crystalline silicon wafers). In fact, they are better than perovskite single crystals reported in prior work: their application in photosensors gives superior detectivity as high as 6 × 1013 Jones, ≈10–100 times better than commercial sensors made of silicon and InGaAs. Meanwhile, the response speed is as fast as 40 µs, ≈3 orders of magnitude faster than their thin film devices. A large‐area (≈1300 mm2) imaging assembly composed of a 729‐pixel sensor array is further designed and constructed, showing excellent imaging capability thanks to its superior quality and uniformity. This opens a new possibility to use the high‐quality perovskite single‐crystal‐based devices for more advanced imaging sensors.  相似文献   

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