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Developing Evaluation Methods of Indoor Air Quality for Information Processing Devices in Information Working Environments

开发信息工作环境中信息处理设备的室内空气质量评价方法

基本信息

批准号：
13450315
负责人：
EMI Hitoshi
金额：
$ 8.83万
依托单位：
Kanazawa University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2001
资助国家：
日本
起止时间：
2001 至 2002
项目状态：
已结题

项目摘要

Recently, contaminants (VOCs, particles, ozone, etc.) emitted from various printers have become a serious issue in indoor environments. In this study, the particle emission from them was mainly characterized to obtain the effective countenneasures against it. A commercialized ink-jet printer (IP), monochrome laser one (MLP) or color laser one (CLP) was installed in a test chamber composed of dual clean booths. The emission rate, size distribution and charge one of particles emitted from it were measured. Further, their stability was checked by introducing them into a diffusion dryer followed by the comparison of their size distributions upstream and downstream of it. As a result, the particle emission rate from IP was in the order of 10^6 particles per sheet at the printing mode, while that from MKP and CLP was in the order of 10^7 at both printing and paper feed modes. These particles were dominanily less than 100nm, indicating that they were not directly derived from toner and main ink mists. Further, the stability tests revealed that the particles emitted at the printing mode are composed of nonvolatile residues and water. That is, ink mists, which are designated as "satellite" and finer than main ones, are entrained from the IP to result in solid dye particles of about 30 nm in size. For MLP and CLP, water and stryrene vapor are emitted from paper sheets covered with toner by heating them at the fixation step, and then are nucleated into nano-particlcs (about 35 nm in size). The formed particles gradually shrink to be stable residues that might be mainly composed of styrene polymer. Therefore, these findings confirmed that not only the countermeasures against the nano-particle emission but its regulation should be undertaken.

最近，污染物(VOCs、颗粒物、臭氧等)从各种打印机排放的废气在室内环境中已经成为一个严重的问题。在本研究中，主要对它们的颗粒物排放进行表征，以获得有效的对策。一台商品化的喷墨打印机(IP)、单色激光打印机(MLP)或彩色激光打印机(CLP)安装在由两个清洁室组成的测试室中。测量了其发射粒子的发射速率、粒度分布和电荷分布。此外，通过将它们引入扩散干燥器中，然后比较它们在其上游和下游的尺寸分布来检查它们的稳定性。因此，在打印模式下，IP的颗粒物排放速率约为每张10^6个颗粒，而在打印和送纸模式下，MKP和CLP的颗粒物排放速率约为10^7个数量级。这些颗粒主要小于100 nm，表明它们不是直接来自碳粉和主墨水雾。此外，稳定性测试表明，在打印模式下排放的颗粒由不挥发残留物和水组成。也就是说，被指定为“卫星”并且比主要的墨雾更细的墨雾被从IP带到一起，从而产生大小约为30纳米的固体染料颗粒。对于MLP和CLP，水和苯乙烯蒸汽从覆盖着墨粉的纸张上通过在固定步骤加热释放出来，然后成核成纳米粒子(尺寸约为35 nm)。形成的颗粒逐渐收缩为稳定的残留物，可能主要由苯乙烯聚合物组成。因此，这些发现证实了不仅要对纳米颗粒排放采取对策，而且要对其进行监管。