打印条件对打印机释放颗粒物水平的影响

Influence of printing conditions on concentration of printer-emitted particles

[背景]打印机工作会释放颗粒物,危害人体健康,但目前对打印条件如何影响打印机释放颗粒物水平的研究不足。[目的]探究不同打印条件对打印机释放颗粒物水平的影响。[方法]在密闭实验仓内进行打印实验,通过便携式气溶胶粒径谱仪和臭氧检测仪分别监测打印机工作过程中实验仓内0.25~32μm粒径范围的颗粒物数量浓度和臭氧浓度的变化情况。实验监测分为三部分,以打印前2 min颗粒物数量浓度作为实验前背景浓度,以打印72页纸作为打印过程进行监测,打印结束后再监测10 min。打印条件设置包括不同字体、不同字号、单面打印和双面打印方式、不同页面布局、不同大小的打印纸、不同品牌的打印纸、不同潮湿程度的打印纸。使用Spearman相关性分析检验打印条件与颗粒物水平间的关系。[结果]打印不同字体(宋体和楷体)、不同字号(四号和五号)时,实验仓内颗粒物数量浓度峰值为14.71~59.35 P·cm^(−3),差异没有统计学意义(P>0.05)。单面打印和双面打印时,颗粒物数量浓度峰值差异没有统计学意义(P>0.05),峰值出现的时间差异有统计学意义(P<0.05)。对于不同页面布局,打印释放的颗粒物数量浓度峰值为纸张上1/3>中1/3>下1/3,差异有统计学意义(P<0.05)。使用B5纸进行打印时未监测到颗粒物数量浓度明显升高。使用不同品牌(得力和晨光)的打印纸,颗粒物数量浓度峰值差异没有统计学意义(P>0.05)。使用不同潮湿程度的打印纸颗粒物数量浓度峰值不同,差异有统计学意义(P<0.05),且随着潮湿程度升高颗粒物数量浓度升高(r=0.95,P<0.05)。仅在使用不同潮湿程度的打印纸,观察到颗粒物峰面积差异有统计学意义(P<0.05)。不同页面布局和纸张潮湿程度下,颗粒物排放速率的差异有统计学意义(P<0.05)。各打印条件下,实验仓内臭氧浓度变化无统计学意义(P>0.05)。[结论]通过改变打印条件,可以影响打印机释放颗粒物水平,其中改变页面布局、纸张大小和潮湿程度对结果的影响较为显著;改变字体、字号、纸张品牌和使用单双面打印对结果无显著影响。

[Background]Printers can release particles,which is harmful to human health.However,there is insufficient research on how printing conditions affect the level of particles released by printers.[Objective]To explore the effects of different printing conditions on the level of printer-emitted particles.[Methods]The experiment was carried out in a closed experimental chamber,and the changes in the number concentration of particles(size range:0.25-32μm)and ozone concentration in the experimental chamber during designed printing process were monitored with a portable aerosol particle size spectrometer and an ozone detector respectively.The monitoring included three parts:2 min before printing as the background number concentration,printing 72 sheets with a designed printing task sets,and then 10 min after printing.A set of printing tasks with predetermined conditions included font,font size,single/double-sided printing mode,page layout,paper size,paper brand,and paper moisture content.The association between printing conditions and level of printer-emitted particles was evaluated by Spearman correlation analysis.[Results]When printing in different fonts(Song and Kai)and different font sizes(14 points and 10.5 points),the number concentration peaks of particles in the experimental chamber were 14.71-59.35 P·cm^(−3),and there was no significant difference(P>0.05).There was no difference in the peak concentrations of printer-emitted particles between single-sided printing and double-sided printing(P>0.05),but there was a significant difference in the time of peak occurrence(P<0.05).For different page layouts,a significant difference in the peak concentrations of printer-emitted particles was found among each trisection area(P<0.05,upper 1/3>middle 1/3>lower 1/3).No increase in the concentration of printer-emitted particles was detected when printing with B5 paper.The peak concentration of printer-emitted particles in printing paper with varying degrees of paper moisture showed differences(P<0.05),and the concentration of particulate matter increased with the increase of moisture content(r=0.95,P<0.05).The peak area of particles was found only related to degree of paper moisture(P<0.05).There were significant differences in the emission rate of particles under different page layouts and degrees of paper moisture(P<0.05).There was no significant change of ozone concentration in the experimental chamber under different printing conditions(P>0.05).[Conclusion]By changing printing conditions,the levels of printer-emitted particles are affected.Among them,page layout,paper size,and degree of paper moisture have a significant impact on the results;however,single/double-sided printing,font,font size,and paper brand have no significant impact on the results.