The Reason Of No-Damage And Environemntal Protaction Heat-Introduced Inkless Eco-Printing

Inspired by the yellow discoloration of plant fibers, our research group proposed the novel concept of heat-induced inkless eco-printing (HIEP), which does not require ink during the printing process and can achieve reliable printing results using an ordinary sheet of office paper. We have previously discussed a mechanism that results in negligible damage to the paper during HIEP. Furthermore, HIEP does not suffer from the severe carbonization of inkless laser printing technology or the significant ink consumption of current laser printing technology, which is considered the most ecologically friendly of the three current printing technologies. In addition, visual effects can be achieved on silk using HIEP. Through the study of the pyrolysis volatile generation and environmental impact incurred by the use of newspaper or silk as HIEP printing materials, the suitability (in terms of pyrolysis volatile generation and environmental impact) of three printing materials for HIEP:newspaper, silk, and printing paper have been discussed.(1) Through further analysis of the TG (Thermal Gravity Analysis) and DSC(Differential Scanning Calorimetry) curves of printing paper, we have found the reason why printing paper has not negligible damage is that the time (the degree of heat effect) of each printing point is much shorter than that of TG test and there is the buffering effect of moisture vaporization meanwhile.(2) Through electron microscope and Gas chromatography-mass spectrometry, we have discussed the microstructures, pyrolysis volatiles and printing effect of HIEP. It has been found that there isn’t obvious carbonization phenomenon after HIEP and yellow color effect that printing needs can be obtained in the temperature of 400℃-600℃.(3) Through pyrolysis mass spectrometry, the pyrolysis volatile generation and environmental impact of printing paper are researched. The heating heat effect degree of printing paper after HIEP is weaker than that after pyrolysis. Therefore, the number of volatiles of HIEP is less than that of pyrolysis. Meanwhile, HIEP does not consume a large of toner like existing laser printer and ecological and need not remove ink when printing paper regenerate. So HIEP is an ecological technology.(4) Through Gas chromatography-mass spectrometry analyzer, we have analyzed the pyrolysis volatile generation and environmental of three kinds of printing materials—newspaper, silk and printing paper after HIEP and found that printing paper is the best appropriate maperial, which newspaper is the worst and silk can still be used to produce artwork, name cards and clothing nameplates in small amounts.