Pulping Yield
Compute the yield of a pulping (wood cooking) process, Y = (dry pulp mass / dry wood mass)·100%, the fraction of wood converted into usable cellulose. Chemical (kraft) pulping has a low yield (~45–55%), since it dissolves lignin and part of the hemicelluloses; mechanical pulping reaches ~95%, but with lower-quality fibers. It is a central indicator of the process economics and type. Enter the dry pulp mass and the dry wood mass.
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Rendimento de polpação
A polpação é o processo que separa as fibras de celulose da madeira, e seu rendimento R = (massa de polpa seca / massa de madeira seca)·100% define quanto da árvore vira papel. A escolha do processo é um trade-off entre rendimento e qualidade. A polpação química — o dominante processo kraft (sulfato), que cozinha os cavacos de madeira com soda cáustica e sulfeto de sódio — dissolve a lignina (a 'cola' que une as fibras) e parte das hemiceluloses, liberando fibras íntegras e fortes, mas com rendimento baixo (~45–55%): mais da metade da madeira é 'perdida' (na verdade, queimada na caldeira de recuperação para gerar energia e recuperar os químicos). Já a polpação mecânica, que simplesmente tritura a madeira, mantém quase tudo (rendimento ~90–95%), mas as fibras saem curtas, danificadas e ainda cheias de lignina (que amarela com o tempo — daí o papel jornal envelhecer). Por isso papel de escrever e cartão usam polpa química (cara, forte, branqueável) e jornal/papel de baixo custo usam mecânica. Informe a massa de polpa seca e a de madeira seca.
Related Tools
Kappa Number → Lignin
Estimate the residual lignin content of a cellulose pulp from the Kappa number, Lignin% ≈ Kappa · 0.15. The Kappa number measures the pulp's permanganate consumption, proportional to the lignin remaining after cooking — the higher the Kappa, the more lignin (dark color, stiffer fibers) remained. It is the main control of delignification, defining the bleaching load needed. Enter the Kappa number.
Paper Breaking Length
Compute the breaking length (self-rupture) of paper, L = tensile index / 9.80665, in km — the length of a paper strip that, hung from one end, would break under its own weight. It is an intuitive, classic way to express tensile strength, independent of grammage. Common papers break around 3–8 km; high-strength papers, more. Enter the tensile index (N·m/g).
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The results provided by this tool are for general informational and educational purposes only and do not constitute professional, financial, medical, legal, tax or accounting advice. Always confirm important decisions with a qualified professional and official sources.