#Headline Creation Challenge ##头条讲真的#
If you want to solve this problem strictly, you can write a doctoral dissertation, and I will directly say the conclusion: if you copy with an inkjet printer, the weight of the white paper will definitely increase, and if you use a laser printer, you are uncertain, the weight of the white paper may increase, decrease, or remain the same (relatively, not absolutely).
Let's start with the situation of inkjet printers.
Since inkjet printers, the principle is only to spray ink on white paper to form words or patterns, then remove the excess waste ink, and the part of the ink evaporated by the inkjet printer using the thermal foaming nozzle, the remaining ink is attached to the white paper, and the weight of the white paper must be increased (excluding natural evaporation).
Common inkjet printers
In addition, inkjet printers (Epson and Brothers) that use micro-piezoelectric printheads do not have a heating function, so theoretically, the weight of the copied paper will be heavier (excluding natural evaporation).
Micro piezoelectric printhead, because of the patent, almost only Epson and Epson OEM inkjet printers on the market that use this printhead are available.
Let's talk about the case of laser printers.
The situation of laser printers is slightly more complicated, because it is not simply the formation of words and patterns by attaching toner to white paper, but a heating process (fixing) is required to fix the toner on the white paper to form the corresponding text or pattern. Regardless of whether it is a fuser roller or fusing film, the instantaneous temperature during the fixing process (the white paper passes through the fusing assembly) will reach about 200°C, which will cause a phenomenon: the water on the white paper will evaporate, and the more humid the paper, the more water will evaporate.
Common laser printer fixing components
So theoretically, as long as the white paper is not jammed in the copying process, and the content that needs to be copied is completely presented, the wetter the white paper is, the more weight it loses after copying, and if it exceeds a certain threshold, it may cause the phenomenon of weight reduction after copying.
Similarly, the more complex the pattern of the copy (the term is called coverage), for example, the more toner is attached to the white paper, if the white paper is not too wet, then in general, the weight of the copied white paper is increased. A balance scale with a precision of up to one hundredth of a gram can weigh the difference.
Precision balance scales
In summary, this problem can be understood as the fact that in most cases, the weight of the copied paper increases, and only in rare cases (laser printers, wet paper, low coverage) does the weight of the copied paper remain the same or decrease.