Bamboo and wood composited electrical laminated wood
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A technology for electrical lamination of wood and bamboo, which is applied in the direction of wood processing utensils, wood veneer joining, and manufacturing tools, etc., to achieve the effects of increasing added value, reducing production costs, and increasing strength
Inactive Publication Date: 2014-02-26
NANJING FORESTRY UNIV
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Problems solved by technology
This method solves the problem of shortage of laminated wood for electrical engineering, improves the added value of poplar and other fast-growing materials, and develops a new type of bamboo-wood composite functional structural material
Method used
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Embodiment 1
[0021] 1) Bamboo rotary-cut veneer and poplar veneer with a thickness of less than 2mm±0.1mm are used as basic constituent units;
[0022] 2) The peeled bamboo veneer needs to be boiled to remove the hot water extract, and dried to a moisture content of 12-14% to avoid cracking during handling; the double-sided coating of poplar veneer has a solid content of 30%, a pH value of 7.5, and a molecular weight of 400 The following low molecular weight phenolic resin, double-sided glue amount 300g / m 2 ;Dry the dipped veneer to a moisture content of 6-10%;
[0023] 3) Dried bamboo veneer and poplar veneer coated with low-molecular phenolic resin, then apply polyvinyl butyral modified phenolic resin, double-sided glue amount 300g / m 2 , after sizing, dry to a moisture content of 6-10%;
[0024] 4) The billet structure is adjusted according to the performance requirements, usually bamboo veneer and poplar veneer are alternately symmetrically assembled, see figure 1 , it can also be al...
Embodiment 2
[0032] Step 1) adopting the bamboo rotary-cut veneer and poplar veneer with a thickness less than 2mm±0.1mm as basic constituent units;
[0033] Step 2) same as above example 2);
[0034] Step 3) Bamboo veneer is coated with polyvinyl butyral modified phenolic resin, double-sided sizing amount 350g / m 2 , after sizing, dry to a moisture content of 6-10%;
[0035] Step 4) the bamboo veneer and 120 grams of heavy phenolic resin impregnated paper, poplar veneer symmetrical assembly, see figure 2 .
[0036] Step 5) Hot-press the above slab at 150°C±5°C, pressure 7.0-8.0MPa, time: 1.2-1.5min / mm into a plate, cool the plate surface to below 50°C, and unload the product.
Embodiment 3
[0038] Step 1) adopting the bamboo rotary-cut veneer and poplar veneer with a thickness less than 2mm±0.1mm as basic constituent units;
[0039] Step 2) same as above example 2);
[0040] Step 3) Bamboo veneer is coated with polyvinyl butyral resin, double-sided sizing amount 330g / m 2 , after sizing, dry to a moisture content of 6-10%;
[0041]Step 4) the bamboo veneer and 120 grams of heavy phenolic resin impregnated paper, poplar veneer symmetrical assembly, see figure 2 .
[0042] Step 5) Hot press the above slab at 150°C±5°C, pressure 8.0-10.0MPa, time: 1.2-1.5min / mm into a plate, cool the plate surface to below 40°C and unload the product.
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Abstract
The invention discloses bamboo and wood composited electrical laminated wood and relates to a process for producing the electrical laminated wood by adopting bamboos and fast-growing wood veneers. The process includes the steps 1), subjecting a thin bamboo veneer to water boiling treatment and soaking a poplar veneer in low-molecular-weight phenolic resin for strengthening treatment; 2), drying the treated bamboo veneer and the fast-growing wood veneer to be 6-8% in moisture content, applying polyvinyl butyral modified phenolic resin class (or polyvinyl butyral class resin/epoxy resin class) and drying the treated bamboo veneer and the fast-growing wood veneer to be 6-10% in moisture content prior to assembling; 3), pressing assembled bamboo veneer and fast-growing wood veneer to obtain an electrical laminated plate under the conditions that hot-press pressure ranges from 3.5MPa to 7.0MPa, time ranges from 1-2min/mm and temperature ranges from 110DEG C to 150DEG C. The bamboo and wood composite electrical laminated wood has the advantages that a medium-density bamboo and a low-density fast-growing wood veneer are composited, the bamboo can share part of compression stress, so that the problems that the electrical laminated wood produced by the low-density bamboo with an overlarge compression ratio is low in impact performance and poor in oil absorbency are solved. The bamboo and wood composited electrical laminated wood is good in dimensional stability, large in resistance, high in intensity and capable of being used for an electrical compression piece, an electrical ring, an insulating plate and the like.
Description
technical field [0001] The invention relates to a method for manufacturing electrical laminated wood by using bamboo and fast-growing wood veneers, and belongs to the technical field of wood-based panel manufacturing in the wood processing industry. Background technique [0002] Electrical laminated wood is a special transformer component in the electrical industry, and it is also a special structural insulating plywood required in high-voltage components. To obtain electrical laminated wood with good performance, tree species with less oil content, less wood acid, good mechanical properties, uniform structure, abundant sources and low price are required. Foreign countries such as France and the Soviet Union all use beech to produce electrical laminated wood, but my country does not produce this kind of wood. At present, my country mainly uses birch to replace beech, and high-quality birch resources are becoming increasingly scarce. The performance of the laminated wood ma...
Claims
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Application Information
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