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网版脱膜剂的制备与使用
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作者 黄昭安 《丝网印刷》 1998年第6期26-27,共2页
在制作网版失败或网印任务完成后,为使丝网回收利用,常需进行网版脱膜作业。用于短版活的网版,若能反复进行版膜剥离,无疑可节约丝网,减少绷网、网面粗化处理等工序,降低成本与工耗,缩短交货日期。这是网印业者的基本常识。市售... 在制作网版失败或网印任务完成后,为使丝网回收利用,常需进行网版脱膜作业。用于短版活的网版,若能反复进行版膜剥离,无疑可节约丝网,减少绷网、网面粗化处理等工序,降低成本与工耗,缩短交货日期。这是网印业者的基本常识。市售的配套专用商品脱膜剂,均属“即开即... 展开更多
关键词 丝网印刷 膜剂 膜剂 制备 使用
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SMT中焊膏印刷存在问题与对策
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作者 许宝兴 《印制电路信息》 1996年第6期29-32,共4页
1 概述 焊膏丝网印刷的目的是把足够的焊膏不偏不倚地施加到特定的焊盘上。为此,分析在印刷中存在的问题有1)位置不准;2)印刷量不符;3)印刷形状不良等3种情况。其中印刷量不符和印刷形状不良大多是同时产生的。
关键词 焊膏印刷 存在问题 脱版 刮板速度 形状不良 助焊剂 金属掩膜 丝网印刷 原因与对策 印刷机
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Insights Into Pedagogical Aspects of E-Learning
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作者 Sarmte Bremze 《Sino-US English Teaching》 2012年第9期1457-1465,共9页
The author's intention is to study pedagogical aspects of e-learning on a larger scale--to look at them on the world scale, through the articles published in the proceedings of the conferences which take place regula... The author's intention is to study pedagogical aspects of e-learning on a larger scale--to look at them on the world scale, through the articles published in the proceedings of the conferences which take place regularly in different countries of the world, and to look at not only the instructors' attitude but also the business people's point of view toward such a form of study as e-learning is, and to illuminate the necessity of the instructors' encouragement in Latvia and other countries as well to use e-learning as a new approach to the study process or only as a new form of study. The author also tries to draw Latvian instructors' attention to the form of foreign educators' publications on the topic in a modest and inconspicuous way in order to encourage discussion. 展开更多
关键词 education technologies E-LEARNING INSTRUCTORS MOTIVATION
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