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，在室内环境中，从各种打印机中发出的污染物（VOC，颗粒，臭氧等）已成为一个严重的问题。在这项研究中，主要表征了它们的粒子发射以获得针对它的有效计数。商业化的喷墨打印机（IP），单色激光ONE（MLP）或彩色激光ONE（CLP）安装在由双干净的摊位组成的测试室中。测量了从中发出的发射速率，尺寸分布和电荷。此外，通过将它们引入扩散干燥机，然后比较其上游和下游的大小分布来检查它们的稳定性。结果，在打印模式下，IP的粒子排放速率为每张纸的粒子为10^6个颗粒，而在打印和纸供料模式下，MKP和CLP的粒子排放率为10^7的顺序。这些颗粒在不到100nm的占主导地位，表明它们不是直接衍生自墨粉和主要墨水雾的。此外，稳定性测试表明，在打印模式下排放的颗粒由非易失性残基和水组成。也就是说，被指定为“卫星”，比主要墨水更细的墨水被夹带到IP中，从而导致固体染料颗粒的大小约为30 nm。对于MLP和CLP，通过在固定步骤中加热纸纸从纸质纸覆盖的纸张纸中发出水和肌蒸气，然后将其成核成纳米 - 党派（大约35 nm）。形成的颗粒逐渐收缩为稳定的残基，可能主要由苯乙烯聚合物组成。因此，这些发现证实，不仅应对纳米粒子排放的对策，而且还应进行调节。