Hollow density board and extruding manufacturing method
A MDF, hollow technology, applied in the direction of flat products, household components, household appliances, etc., can solve the problem of no report of hollow MDF, and achieve the effect of obvious sound insulation and heat insulation, simple processing and high utilization rate
Inactive Publication Date: 2011-08-17
NANJING FORESTRY UNIV
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Problems solved by technology
[0002] The use of wood fibers to manufacture hollow density boards has not been reported at home and abroad.
Method used
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Embodiment
[0043] Main raw materials: Medium-density sawn sapwood is crushed and screened to select qualified wood fibers, and laminate flooring manufacturers' grooved waste is screened to select qualified wood fibers.
[0044] The adhesive used to extrude the hollow density board is urea resin, which has various indicators. The solid content of the resin is not less than 56%, the resin viscosity is 100-200 seconds (20 degrees moderate B3-4 viscometer), the free formaldehyde is not more than 1%, and the hollow MDF board uses general industrial yellow (white) paraffin for waterproofing agent, melting point is 50°C-58°C.
[0045] Equipment for producing boards:
[0046] Drum dryer: inner diameter 2034 mm, length 9140 mm. Speed 6-12 rpm.
[0047] Screening machine: upper sieve hole 3*3 mm, lower sieve hole 0.5*0.5 mm.
[0048] Glue machine.
[0049] Paraffin emulsifier.
[0050] OK vertical extrusion machine (2 sets), motor power: 16 watts, the punch can punch 60-138 times per minut...
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The invention relates to a hollow density board manufactured by wood fibre and extruding manufacturing method. The invention is characterized in that a core layer of the hollow density board is provided with a row of hollow round holes; the periphery distances of the holes are 3mm; and the distances between the periphery of the holes and the surface of a plank stuff is 5mm. The extruding manufacturing method comprises the steps as follows: medium density refuse parts treating, smashing, material cabin wetting, screening, drying, coarse material re-smashing, paraffin wax waterproofing agent preparation, cementing compound modulating, screening, material cabin drying, cementing compound and waterproofing agent spraying, material cabin storing, extruding, saw cutting, and stow balancing. Thehollow density board has the advantage of light weight, namely the weight of the hollow density board is half of that of the traditional density board; the impact resistance can reach 28kg / cm2; the bending strength can reach 180kg / cm2; the stretch strength can reach 18kg / cm2; the thickness swelling rate of water absorption does not exceed 1.5 percent; and the formaldehyde release amount is 8mg for every 100g of the density board, so that the hollow density board satisfies the environmental protection requirement and belongs to a green product; and a hollow structure has obvious sound and heat insulation effects. The hollow density board has the advantages of high utilization rate, convenience for connection, and simplicity for processing.
Description
technical field [0001] The invention relates to a hollow density board and an extrusion manufacturing method, belonging to the technical field of wood-based board manufacturing. Background technique [0002] The use of wood fibers to manufacture hollow density boards has not been reported at home and abroad. Contents of the invention [0003] The present invention proposes an extrusion method hollow density board, whose weight is only half of that of the traditional medium density board, while the impact resistance can reach 28 kilograms per square centimeter, the bending strength can reach 180 kilograms per square centimeter, and the tensile strength can reach 28 kilograms per square centimeter. It can reach 18 kilograms per square centimeter, the water absorption thickness expansion rate does not exceed 1.5%, and the formaldehyde emission is only 8 mg per 100 grams. [0004] Technical solution of the present invention: hollow medium density board, its structure is that ...
Claims
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IPC IPC(8): B27N3/28B27N3/04
Inventor 王卫东张耀丽张晓坤
Owner NANJING FORESTRY UNIV