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Method for manufacturing high intensity plywood for engineering structure by utilizing fast growing wood

An engineering structure and plywood technology, which is applied in the jointing of wooden veneers, wood processing equipment, wood treatment, etc., can solve the problems of perishability, variability, and low strength, and achieve good dimensional stability and high static bending strength , The effect of small thickness expansion rate

Inactive Publication Date: 2014-08-20
NANJING FORESTRY UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The present invention proposes a method of using fast-growing wood to prepare plywood for high-strength engineering structures. Its purpose is to fundamentally overcome the natural shortcomings of fast-growing wood, such as low strength, variability, and perishability, through veneer strengthening treatment. The enhanced fast-growing wood veneer can replace tropical hardwood veneer for the manufacture of high-strength plywood for engineering structures, improve the utilization value of fast-growing wood, and reduce the consumption of tropical hardwood

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Select an air-dried poplar veneer with a thickness of 1.8 mm, dip it in a 2D resin modification solution with a concentration of 40% and add 2% zinc chloride for 6 hours, take it out and drain it, and dry it at 95°C for 12 hours. After cooling, the core board is coated with phenolic glue on both sides, and the amount of glue applied is 300g / m 2 According to the principle of criss-cross veneers and glue-coated veneer interlayer arrangement, 11 layers of 4′×8′ slabs are formed, pre-pressed at a pressure of 1.0MPa for 30min, and sent to a hot press for hot pressing at a temperature of 130°C. The pressing pressure is 1.0MPa, the hot pressing time is 20min, then the temperature is lowered to 70°C, the plate is unloaded, and the edge is aligned after standing for 24h, and the thickness is sanded to 18mm. The upper and lower surfaces are covered with 2 pieces of impregnated paper, and sent into the lamination press. Hot-press at a temperature of 130°C and a pressure of 1.2 MP...

Embodiment 2

[0022] Adopt 19 layers of poplar veneers that have been strengthened in Example 1, each of the upper and lower surfaces has three consecutive layers of vertically paved veneers, and the remaining layers are arranged in a criss-cross pattern, and the interlayers of the veneers in the core layer are coated with phenolic glue that adds insect repellent , glue amount 300g / m 2 , pre-pressed at 1.0MPa for 40 minutes, sent to a hot press for hot pressing, temperature 130 ° C, hot pressing pressure 1.5 MPa, hot pressing time 40 min, then cooled to 70 ° C, unloaded plate, placed for 24 hours, trimmed, and fixed thickness Sanding to 28mm, chamfering and milling grooves on four sides to make high-strength plywood. The plywood can be used as a standard container floor, and its performance is equivalent to the container floor made of imported cloned veneer.

Embodiment 3

[0024] Adopt 11 layers of poplar veneers strengthened in Example 1, each layer is arranged in a criss-cross pattern, and the interlayer of each veneer of the core layer is coated with phenolic glue, and the amount of glue applied is 300g / m 2 , pre-pressed at 1.0MPa for 30 minutes, sent to a hot press for hot pressing, temperature 130 ° C, hot pressing pressure 1.2 MPa, hot pressing time 40 min, then cooled to 70 ° C, unloaded plate, placed for 24 hours and then aligned, slightly sandy Light, and then paste a piece of Okoume veneer with a thickness of 1.3mm on the upper and lower surfaces, and sand the thickness to 21mm to make Okoume veneer plywood. The plywood can be used as ship plywood.

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Abstract

The invention provides a method for manufacturing high intensity plywood for an engineering structure by utilizing fast growing wood. The method comprises the following steps of (1) single plate rotary cutting, (2) modified liquid preparation, (3) single plate reinforced processing, (4) gluing assembly prepressing, (5) plate blank hot press forming, and (6) veneering or film covering processing. The method for manufacturing the high intensity plywood for the engineering structure by utilizing the fast growing wood has the advantages that firstly modified liquid reinforced processing is carried out on the single plates of the fast growing wood, the intensity of the single plates of each layer is improved to a large extent, the reinforcing degree of the single plates can be adjusted through the weight gain rate of the single plates, and the weight gain rate of the reinforced single plates can be reduced from outside to inside in a graded mode to save cost and fully perform the intensity performance of single plates of all layers; thus, plywood products gain extremely high static bending intensity, elasticity modulus and surface hardness under the condition of a low compression rate, the thickness swelling rate of the products is small, the dimensional stability of the products is good, and reinforcer gives the products good rotproofness and weather resistance at the same time.

Description

technical field [0001] The invention relates to a method for preparing high-strength plywood for engineering structures by using fast-growing wood through veneer strengthening treatment and then gluing. The invention belongs to the field of wood science, wood processing and wood-based panel technology. Background technique [0002] A large number of high-strength plywood products are used in road and bridge construction, shipbuilding, vehicle and ship transportation, such as fair-faced concrete formwork, ship plywood, container floor, train flat car floor, etc. These products not only require extremely high strength, rigidity, surface decoration and wear resistance, good dimensional stability and machinability, but also must have excellent aging resistance, anti-corrosion and insect-proof properties, and generally use tropical hardwoods in Southeast Asia and Africa. Or Nordic, North American birch. With the over-harvesting of tropical rain forests, the supply of high-quali...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B27D1/08B27K3/04B27K5/04B27K3/52
Inventor 孙丰文彭晓晓刘龙龙
Owner NANJING FORESTRY UNIV
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