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| Lignina de Klason× | Contracció de la fusta× | |
|---|---|---|
| Camp | Ciències forestals | Ciències forestals |
| Família | Process / pipeline | Process / pipeline |
| Any d'origen≠ | 1908 | 1950 |
| Autor original≠ | Erik Klason | Carl Skaar |
| Tipus≠ | chemical analysis | moisture response test |
| Font seminal≠ | TAPPI T222 om-15. (2015). Acid-insoluble lignin in wood and pulp. TAPPI Press. link ↗ | ASTM D143-19. (2019). Standard test methods for small clear specimens of timber. ASTM International. link ↗ |
| Àlies | acid-insoluble lignin, lignin content | dimensional change, anisotropic shrinkage |
| Relacionats≠ | 3 | 2 |
| Resum≠ | The Klason lignin method is a standard chemical test for quantifying the acid-insoluble lignin content in wood and plant biomass. Developed by Erik Klason in 1908, the method treats wood with sulfuric acid to dissolve carbohydrates (cellulose and hemicellulose) while leaving the acid-insoluble lignin residue. Klason lignin is widely used in wood science, pulp chemistry, and biomass characterization to assess wood composition and predict properties. | Wood shrinkage is the dimensional change that occurs as wood loses moisture from green (freshly felled) to oven-dry condition. Wood shrinks anisotropically: tangentially (along growth rings) more than radially (from center to edge), and both more than longitudinally (along the grain). Measuring shrinkage percentages is essential for understanding wood drying behavior, predicting checking and warping, and selecting materials for applications sensitive to dimensional change (flooring, cabinetry, musical instruments). |
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