共查询到19条相似文献,搜索用时 797 毫秒
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防螨抗菌强化木地板的研制 总被引:1,自引:0,他引:1
筛选并改进抗菌剂添加在胶液中,采用表面改性剂改善抗菌剂与胶液的相溶性能,按现行生产工艺浸渍胶膜纸,利用现有生产设备及工艺技术压制强化木地板。经检测认定,地板各项物理力学性能达到国家标准,防螨抗菌效果明显。 相似文献
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采用GB/T 17657-1999《人造板及饰面人造板理化性能检测方法》等标准中有关方法,检测不同厚度强化木地板及其基材表面结合强度,并对试验结果进行分析,以探讨不同检测方法对不同厚度试样检测结果的影响。 相似文献
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模具表面的激光强化加工系统和激光强化工艺方法,激光强化模具表面的硬化层深度和耐磨性能与激光强化工艺参数之间的关系,采用激光强化技术能大幅度提高模具的使用寿命,激光相变硬化(LTH),激光表面熔化处理(LSM),激光表面涂覆及合金化(LSC/LSA),激光表面化学气相沉积(LCVD),激光物理气相沉积(LPVD),激光冲击(LSH)和激光非晶化,用于提高模具寿命的方法有激光相变硬化和激光表面熔覆和合金化,用激光相变硬化技术提高模具寿命。 相似文献
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文章介绍了钛及钛合金的基本性质及组织结构,并且综述了强化钛及钛合金表面的各种处理技术,如渗氮、渗碳、渗硼、渗氧、激光表面处理等。表明了各种表面处理技术都可以强化钛及钛合金的表面硬度及耐磨性,希望为相关工作提供参考。 相似文献
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为了解决现有制程中连接片厚度异常、漏检及变形问题,同时也为了消除非接触式测量金属薄片因被测表面凹凸及变形等因素造成的测量误差,设计了Breaker电池保护连接片厚度测量系统.采用扩散反射线光束型激光位移传感器,便于上下两组激光发射光束同轴的调整;对被测表面多点采样作平滑化、平均化处理,降低连接片表面凹凸及变形等对测量的影响;精确定位被测对象后,系统再实时采样上下激光数据,保证上下激光数据的同步;实时标定厚度测量基准值,保证测量准确性;采用双轴水平传感仪对系统作水平度标定,保证上下激光发射光束与被测物表面垂直,提高测量精度. 相似文献
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Physical polymer surface modification methods and applications in food packaging polymers. 总被引:4,自引:0,他引:4
M Ozdemir C U Yurteri H Sadikoglu 《Critical reviews in food science and nutrition》1999,39(5):457-477
Continued innovations in the polymer industry have made polymer surface modification methods a subject of intense research. The importance and necessity of surface modification of plastics are explained, and the advantages of physical surface treatments over the less-sophisticated chemical methods are outlined. Currently available physical surface modification methods for food packaging polymers are reviewed from the food packaging perspective. These physical surface modification methods include flame, corona discharge, UV, gamma-ray, electron beam, ion beam, plasma, and laser treatments. The principle of operation of each method is briefly described, and the advantages and disadvantages of each technique are cited. The extent to which each of these methods can produce the specific modifications desired is discussed. Furthermore, the effects of each treatment on barrier, mechanical, and adhesion properties of food packaging polymers are also examined. Finally, an overview of economic aspects of sophisticated surface modification techniques, including ion beam, plasma, and laser treatments, is presented. 相似文献
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We study the application of laser-heating technology to browning dough, due to its potential for high-resolution spatial and surface color control. An important component of this process is the identification of how laser parameters affect browning and baking and whether desirable results can be achieved. In this study, we analyze the performance of a carbon dioxide (CO2) mid-infrared laser (operating at 10.6 μm wavelength) during the browning of dough. Dough samples—consisting of flour and water—were exposed to the infrared laser at different laser power, beam diameter, and sample exposure time. At a laser energy flux of 0.32 MW m−2 (beam diameter of 5.7 mm) and sample exposure time of 180 s we observe a maximum thermal penetration of 0.77 mm and satisfactory dough browning. These results suggest that a CO2 laser is ideal for browning thin goods as well as for food layered manufacture.Industrial relevanceA CO2 laser that operates at a wavelength of 10.6 μm (IR) was used as an alternative method for browning dough. The high-power flux of the laser and the high energy absorption of food at this wavelength allow for rapid surface browning; however, the high absorption limits thermal penetration depth. Nevertheless, accuracy of the laser beam enables high resolution spatial and thermal control of the non-enzymatic browning process. This high precision cooking makes laser-browning particularly ideal for food layered manufacture (FLM), a food processing technique that has gained increased attention in recent years. Using FLM, one can adjust the printed layer height to match cooking penetration depth. As a digital manufacturing technology, laser-browning could also enable manufacture of highly complex and customized food geometries and textures. 相似文献
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从Mellin变换理论出发,推导了激光光束在湍流大气中斜程传输时的光束漂移公式,并在此基础上分析了准直激光光束漂移方差与靶标高度,光束半宽的关系.从结果可以看出,斜程传输在一定的距离内,靶标高度越高,光束的漂移方差越小;光束的初始半宽越大,光束的漂移方差越小.在斜程传输1km到10km距离下,随着靶标高度的逐渐增大,光束漂移方差的变化幅度越来越小,这时大气湍流的影响比水平传输时要小得多,上述理论结果与其他文献结果一致,从而也说明了Mellin变换理论在处理光束漂移方面的可行性. 相似文献
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王佳 《北京印刷学院学报》2009,17(6):45-47
针对传统大气激光通信系统浪费了大部分光能量的问题,提出一种新型大气激光通信系统,接收天线采用大口径非成像光学系统的设计,而发射天线的光束发散角设计得非常小,构造“小光束发散角、大接收面”的传输方式,优化了系统的探测方程,提高了大气激光通信系统的带宽、距离和对准的可靠性。大口径非成像光学系统在接收光功率和允许对准误差两个方面都远优于望远镜,而且对接收天线面形精度的要求很低,可以用低成本制造,面形误差所引起的光脉冲展宽对通信系统带宽的影响较小,可以满足绝大多数的通信要求。 相似文献
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