Figure 8A shows that holocellulose paper is semi-transparent with the words “Holocellulose”visible below the sheet, while Kraft paper is opaque. Moreover, holocellulose paper has a similar isual appearance compared to papers based on fully bleached softwood pulps (Figure S4), and both have the same ISO brightness of 68 ± 1%. In comparison, Kraft paper has an ISO brightness of only 16 ± 0.5%. This enables holocellulose paper to function as good substrates for printing or coating. From Figure 8B, the optical transmittance of the holocellulose paper is approximately 55%, which is significant higher than that of the Kraft paper (below 30%). Several factors contribute to the higher light transmittance of the holocellulose papers, including the lower lignin content(lignin absorbs light), higher paper density,as well as the possibility of“soft”hemicellulose to fill the gaps in the fiber network, which means fewer fiber/air interfaces and light scattering sites.
Figure 8A shows that holocellulose paper is semi-transparent with the words “Holocellulose”visible below the sheet, while Kraft paper is opaque. Moreover, holocellulose paper has a similar isual appearance compared to papers based on fully bleached softwood pulps (Figure S4), and both have the same ISO brightness of 68 ± 1%. In comparison, Kraft paper has an ISO brightness of only 16 ± 0.5%. This enables holocellulose paper to function as good substrates for printing or coating. From Figure 8B, the optical transmittance of the holocellulose paper is approximately 55%, which is significant higher than that of the Kraft paper (below 30%). Several factors contribute to the higher light transmittance of the holocellulose papers, including the lower lignin content(lignin absorbs light), higher paper density,as well as the possibility of“soft”hemicellulose to fill the gaps in the fiber network, which means fewer fiber/air interfaces and light scattering sites.
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