A kind of production method of ultrafine formaldehyde residue fiberboard

Abstract

The invention relates to the technical field of making man-made fiberboards, in particular to a production method of ultrafine formaldehyde residual fiberboards. The production method of the fiberboard comprises the following steps: preparing adhesive - making wood fiber - sizing - drying - paving and pre-pressing - hot pressing - finished product. The present invention utilizes forest felling residues, wood processing residues, or bagasse as raw materials to produce fiberboards, turning waste into wealth, and effectively realizing the full utilization of wood resources; The residual adhesive is environmentally friendly, safe, and has good water resistance and strong bonding strength; the fiberboard produced with this adhesive has almost no formaldehyde residue and strong bonding force; the content of harmful substances to the human body is low , almost none, reducing the harm to the human body, and the internal structure of the board is uniform, the density is moderate, the dimensional stability is good, the quality is stable, and the service life is long.

Description

technical field [0001] The invention relates to the technical field of manufacturing fiberboards for decoration materials and building materials, in particular to a production method for fiberboards with ultrafine formaldehyde residues. Background technique [0002] With the progress of society and the continuous improvement of human awareness of environmental protection, man-made panels are gradually replacing natural wood in areas such as architectural decoration. Density board, also known as fiberboard, is a man-made board made of wood fiber or other plant fiber and applied with urea-formaldehyde resin or other suitable adhesives. According to its density, it can be divided into high-density board, medium-density board and low-density board. MDF is soft, impact-resistant, and easy to reprocess. It is a good material for making furniture abroad. However, because the national standard for high-density boards is several times lower than the international standard, the use q...

AI Technical Summary

Problems solved by technology

However, the traditional fiberboard production process has the following defects: ① Due to the use of traditional adhesives, the formaldehyde emission of the finished board cannot meet the standard requirements, and the product requirements can only be met after ammonia treatment, and the amino acid residue in the finished board causes environmental pollution; Adding additives in the hot grinding section will change the index ratio of the adhesive. At the same time, it is difficult to achieve a stable addition ratio, the stability of the adhesive will change, and the difficulty in controlling the formaldehyde emission of the finished board will increase.

[0004] Most of the fiberboards currently on the market can release formaldehyde to meet the national standard requirements (in 2001, the country promulgated the "Limits for Formaldehyde Release in Wood-based Panels and Their Products for Interior Decoration Materials" GB18580-200l, and the release of free formaldehyde is ≤ 1.5 mg / L, can be directly used indoors, decoration materials with free formaldehyde emission ≤ 5.0 mg / L must be decorated before they can be used indoors), but there is still the release of harmful substances, the decoration used in homes, offices, activities and other places Materials or supplies, such as floors, furniture, wallpapers, ceilings, wooden doors and windows, paints, etc. Although the release of harmful substances from each product will meet the national standard requirements, several decoration materials are used together in the same space and released together. The harmful substances will greatly exceed the national standard, which will seriously threaten the health of the people

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