초록 ▼

There is provided a fiberboard, such as a MDF fiberboard or a HDF fiberboard, comprising wood fibers, a binder, and a sludge such as a pulp and a paper sludge. The sludge can be, for example, chosen from a primary pulp and paper sludge, a secondary pulp and paper sludge, a de-inking sludge, and mixt

There is provided a fiberboard, such as a MDF fiberboard or a HDF fiberboard, comprising wood fibers, a binder, and a sludge such as a pulp and a paper sludge. The sludge can be, for example, chosen from a primary pulp and paper sludge, a secondary pulp and paper sludge, a de-inking sludge, and mixtures thereof.

대표청구항 ▼

1. A fiberboard comprising: wood fibers;a binder present in said fiberboard in an amount of about 18% or less by weight, based on the total dry weight of the fiberboard; andan untreated sludge chosen from a primary pulp and paper sludge, a secondary pulp and paper sludge, and mixtures thereof,wherei

1. A fiberboard comprising: wood fibers;a binder present in said fiberboard in an amount of about 18% or less by weight, based on the total dry weight of the fiberboard; andan untreated sludge chosen from a primary pulp and paper sludge, a secondary pulp and paper sludge, and mixtures thereof,wherein said fiberboard is a medium density fiberboard or a high density fiberboard having a density of about 500 to about 1000 kg/m3. 2. The fiberboard of claim 1, wherein said wood fibers are virgin wood fibers, post-consumption wood fibers, or a mixture thereof. 3. The fiberboard of claim 1, wherein said sludge is present in said fiberboard in an amount of at least 1% by weight, based on the total dry weight of the fiberboard. 4. The fiberboard of claim 1, wherein said sludge is present in said fiberboard in an amount of at least 5% by weight, based on the total dry weight of the fiberboard. 5. The fiberboard of claim 1, wherein said sludge is present in said fiberboard in an amount of at least 10% by weight, based on the total dry weight of the fiberboard. 6. The fiberboard of claim 1, wherein said sludge is present in said fiberboard in an amount of about 1% to about 40% by weight, based on the total dry weight of the fiberboard. 7. The fiberboard of claim 1, wherein said sludge is present in said fiberboard in an amount of about 1% to about 15% by weight, based on the total dry weight of the fiberboard. 8. The fiberboard of claim 1, wherein said sludge is a primary pulp and paper sludge. 9. The fiberboard of claim 1, wherein said sludge is a mixture of primary pulp and paper sludge and a secondary pulp and paper sludge. 10. The fiberboard of claim 1, wherein said sludge is an untreated primary sludge taken from a paper mill. 11. The fiberboard of claim 1, wherein said fiberboard has an internal bond strength of at least 1.30 N/mm2. 12. The fiberboard of claim 3, wherein said fiberboard has an internal bond strength of at least 1.40 N/mm2. 13. The fiberboard of claim 1, wherein said fiberboard has an internal bond strength of at least 1.70 N/mm2. 14. The fiberboard of claim 1, wherein said fiberboard has an internal bond strength of at least 1.90 N/mm2. 15. The fiberboard of claim 7, wherein said fiberboard has an internal bond strength of about 1.3 N/mm2 to about 1.98 N/mm2. 16. The fiberboard of claim 15, wherein said fiberboard has a density of about 800 kg/m3 to about 1000 kg/m3. 17. The fiberboard of claim 1, wherein said fiberboard has a density of about 900 kg/m3 to about 1000 kg/m3. 18. The fiberboard of claim 1, wherein said fiberboard has a density of about 800 kg/m3 to about 950 kg/m3. 19. The fiberboard of claim 1, wherein said binder is chosen from formaldehyde-based resins, isocyanate-based resins, and mixtures thereof. 20. The fiberboard of claim 1, wherein said sludge is present in said fiberboard in an amount of 15% or less by weight, based on the total dry weight of the fiberboard. 21. The fiberboard of claim 1, wherein said sludge is present in said fiberboard in an amount of about 2% to about 10% by weight, based on the total dry weight of the fiberboard. 22. The fiberboard of claim 1, wherein said sludge is present in said fiberboard in an amount of about 5% by weight, based on the total dry weight of the fiberboard. 23. The fiberboard of claim 1, wherein said sludge is present in said fiberboard in an amount of about 10% by weight, based on the total dry weight of the fiberboard. 24. The fiberboard of claim 20, wherein said fiberboard has a density of about 800 kg/m3 to about 1000 kg/m3. 25. The fiberboard of claim 24, wherein said binder is present in said fiberboard in an amount of about 15% or less by weight, based on the total dry weight of the fiberboard. 26. The fiberboard of claim 24, wherein said binder is present in said fiberboard in an amount of about 12.5% or less by weight, based on the total dry weight of the fiberboard.