A low-formaldehyde-content environmentally friendly density fiberboard and a manufacturing method thereof

A density board, environmental protection technology, applied in pulp beating/refining method, fiberboard, textiles and papermaking, etc., can solve the problems of ecological environment damage and inefficient utilization, so as to reduce the application amount, improve product quality grade, The effect of reducing formaldehyde emission

CN109537336AInactive Publication Date: 2019-03-29SHANGHAI CHANGFA NEW MATERIAL CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2019-03-29
Estimated Expiration
Not applicable · inactive patent

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Abstract

A low-formaldehyde-content environmentally friendly density fiberboard is disclosed, including following components by weight: 50-60 parts of wood, 25-35 parts of papermaking waste and 10-20 parts ofglue. A manufacturing method of the density fiberboard includes chipping and crushing the wood and the papermaking waste, then mixing the chipped and crushed wood and papermaking waste, and subjectingthe mixture to defibrating, glue spraying, drying, paving, thermal compression and aftertreatment to obtain the density fiberboard. The papermaking waste is adopted in the density fiberboard to replace a part of wood fibers on the one hand so as to fill the gap of wood supply, and to avoid environment pollution caused by papermaking waste incineration and emission, thus reducing the cost and improving quality; and on the other hand, the papermaking waste is used in the density fiberboard to increase bonding force between the glue and wood fibers in the density fiberboard and to reduce the dosage of the glue, thus finally reducing the formaldehyde released, and improving the product quality grade of the density fiberboard product.
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Description

technical field

[0001] The invention relates to the technical field of density board manufacturing, in particular to a low-aldehyde environment-friendly density board and a manufacturing method thereof. Background technique

[0002] The wood-based panel industry is an important industry that efficiently utilizes wood resources and an important means to achieve sustainable development strategies. In the current situation of dwindling forest resources, making full use of forestry "residues" to replace large-diameter timber products plays an irreplaceable role in rationally utilizing forest resources, protecting the environment, and meeting the needs of economic and social development for forestry.

[0003] my country is a big country in the papermaking industry. A large amount of residues in the papermaking process - most of the papermaking waste is burned as fuel or entered into the sewage system, which not only cannot be used efficiently, but also causes great damage to the ...

Examples

Embodiment 1

[0027] Raw materials and dosage: 55 parts of pine wood, 30 parts of papermaking waste, and 15 parts of urea-formaldehyde glue.

[0028] The pine wood is cut into wood chips that meet the production specifications, providing better conditions for its fiber separation, and the papermaking waste is crushed into papermaking waste particles of a certain particle size;

[0029] The obtained wood chips are preheated and cooked, and mechanically separated to obtain fibers;

[0030] The obtained paper-making waste particles are put into a thermal mill, and mixed evenly with the cooked wood chips in proportion, the gap between the grinding discs is controlled at 0.6 mm, the steam pressure is controlled at 0.65 MPa, and the mixture of fibers and paper-making waste is obtained through mechanical separation;

[0031] Use steam spray glue for the obtained fiber papermaking waste mixture, so that the glue is more evenly sprayed on the fiber surface;

[0032] Drying: The mixture of fibrous a...

Embodiment 2

[0037] Raw materials and dosage: 55 parts of pine wood, 35 parts of papermaking waste, and 10 parts of urea-formaldehyde glue.

[0038] The wood is cut into wood chips that meet the production specifications to provide better conditions for its fiber separation, and the papermaking waste is crushed into papermaking waste particles of a certain particle size;

[0039] The obtained wood chips are preheated and cooked, and mechanically separated to obtain fibers;

[0040] The obtained paper-making waste particles are put into a thermal mill, and mixed evenly with the cooked wood chips in proportion, the gap between the grinding discs is controlled at 0.6mm, the steam pressure is controlled at 0.75MPa, and the fiber and paper-making waste mixture is obtained through mechanical separation;

[0041] Use steam spray glue for the obtained fiber papermaking waste mixture, so that the glue is more evenly sprayed on the fiber surface;

[0042] Drying: heat-grinding fiber papermaking was...

Embodiment 3

[0047] Raw materials and dosage: 50 parts of pine wood, 30 parts of papermaking waste, 20 parts of urea-formaldehyde glue.

[0048] The pine wood is cut into wood chips that meet the production specifications, providing better conditions for its fiber separation, and the papermaking waste is crushed into papermaking waste particles of a certain particle size;

[0049] The obtained wood chips are preheated and cooked, and mechanically separated to obtain fibers;

[0050] The obtained paper-making waste particles are put into a thermal mill, and mixed evenly with the cooked wood chips in proportion, the gap between the grinding discs is controlled at 0.6mm, the steam pressure is controlled at 0.75MPa, and the fiber and paper-making waste mixture is obtained through mechanical separation;

[0051] Use steam spray glue for the obtained fiber papermaking waste mixture, so that the glue is more evenly sprayed on the fiber surface;

[0052] Drying: heat-grinding fiber papermaking wa...