共查询到20条相似文献,搜索用时 93 毫秒
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我公我公司12万吨涂布白纸板生产线,纸板机网部引进芬兰Valmet四叠网+MB网成形器,该纸机正常工作车速为350m/min。由于衬层原料使用的脱墨级#8美废报纸中含有大量的油墨、热熔性胶粘物及其它粘性沉积物,在处理过程中这些粘性物质不易被净化和洗涤掉,而带入上浆系统,在成形网上沉积,加上纸机封闭的白水循环所产生的生物粘泥和腐浆在成形网上与之混合,粘附在成形网上或混入浆料系统,不仅造成糊网,浆料在网部脱水困难,而且湿纸页局部成形较差,严重影响产品质量。这种情况下,每隔5~7天就得停机清洗成形网和上浆系统,严… 相似文献
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疏松多孔的填料对白水封闭循环和阴离子垃圾捕集的影响 总被引:2,自引:0,他引:2
在逐步减少水循环回路中清水补充量的同时,如何生产高质量的纸张,是造纸厂面临的一大挑战。因此,白水中阴离子垃圾和纸机沉积物的控制变得越来越重要。现在,许多工厂正试图用碱性过氧化物漂白机械浆,代替漂白硫酸盐浆生产高附加值的纸种,包括灰分含量高的不含磨木浆的未涂布纸。长纤维对 相似文献
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本文主要介绍碳酸饮料厂的自来水及净水的处理工艺,着重讨论净水处理化学剂量的控制——2P—M(净水处理中石灰余量)最适值。 相似文献
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高压脉冲电场灭菌技术是近年来发展起来的极有潜力的非热灭菌技术,但由于其参数较多,对于最佳的灭菌参数至今未有定论。所以该论文提出了一种将高压脉冲电场灭菌与传统的热杀菌技术相结合的灭菌技术,旨在发挥两者的优点,实现一种简单、节能、快速、安全、高效的灭菌技术。通过实验,可以发现,将大肠杆菌在45℃条件下进行预热5min后再进行高压脉冲电场灭菌,大肠杆菌的存活率已降至13.69%。这样既节省了能源,又适用于一些不能够加热至45℃以上的食物灭菌,是一种可以广泛应用的灭菌技术。 相似文献
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Quality and mold control of enriched white bread by combined radio frequency and hot air treatment 总被引:1,自引:0,他引:1
Yanhong LiuJuming Tang Zhihuai MaoJae-Hyung Mah Shunshan JiaoShaojin Wang 《Journal of food engineering》2011,104(4):492-498
This study explored the application of radio frequency (RF) energy in conjunction with conventional hot air treatment to provide uniform heating for control of mold in pre-packaged bread loaf. A 6 kW, 27.12 MHz RF system was used to develop treatment protocols. The treatment parameters were selected based on minimum time-temperature conditions that were required for 4-log reduction of Penicillium citrinum spores while yielding acceptable bread quality. During combined RF and hot air treatments, the core and periphery of the bread loaf were heated together with almost the same heating rate. The maximum temperature difference within one bread slice was less than 5 °C. The moisture contents and water activities of RF treated samples first increased and then decreased compared to those of untreated samples, while firmness increased during the storage for both heat treated and untreated samples, yet the overall differences in sample qualities between RF treated bread samples and control were not significant. Because of better heating uniformity, much lower mean product temperature and shorter holding time were used for control of P. citrinum spores with combined RF and hot air treatment as compared to conventional heating alone. Heating bread to 58 °C or higher resulted in 4-log reduction of P. citrinum spores isolated from moldy bread. The storage life at room temperature (23 °C) was extended by 28 ± 2 days for the treated white bread. 相似文献
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Thacker PD 《Environmental science & technology》2006,40(10):3131-3132
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目的:初步研究汽爆功能性红曲的灭菌效果以及对其活性物质莫纳可林K(Monacolin K)的影响。方法:汽爆功能性红曲以蒸汽为汽爆介质,研究115、125、135℃温度下分别维压0、1、3、5 min,功能性红曲中Monacolin K含量、水分含量、菌落总数的变化,采用灭菌指示胶带图像处理法评价灭菌效果。结果:汽爆灭菌在达到灭菌要求的情况下(135℃汽爆3 min),相比较传统高压蒸汽灭菌条件121℃、20 min,汽爆后功能性红曲含水量和Monacolin K的损失率分别为13.07%和3.92%,均低于传统高压蒸汽灭菌后的含水量(18.49%)和损失率(17.76%),该汽爆条件下灭菌指示胶带热敏区域灰度平均值为62.77。结论:汽爆灭菌对于功能性红曲是可行且高效的,该汽爆工艺节省红曲产品后续干燥的能量,降低了生产成本,为功能性红曲有效灭菌、保留活性成分以及减少灭菌后成品含水量的汽爆灭菌提供理论依据。 相似文献
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Helena Paízková 《Zeitschrift für Lebensmitteluntersuchung und -Forschung A》1974,156(4):193-195
Summary Trace amounts of water in fatty materials were determined by infra-red spectroscopy using the stretching OH vibration band at 3700 cm–1 for analysis. Differential procedure was applied - untreated sample in carbon tetrachloride was measured against the same sample dried with molecular sieve 3 Å.
Bestimmung des Wassers durch Infrarot-Spektroskopie
Zusammenfassung Spurenmengen von Wasser im Fettmaterial wurden mittels Infrarotspektroskopie bestimmt. Die OH-Valenzschwingung bei 3700 cm–1 wurde zur Analyse benutzt. Eine Differenzmethode wurde angewandt: In Kohlenstofftetrachlorid wurde die Probe gegen derselben Probe getrockneten mit dem Molekularsiebe 3 Å gemessen.相似文献