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Improved method for manufacturing high-frequency heated bamboo/wood recombined material

A manufacturing method and high-frequency heating technology, applied in manufacturing tools, wood-layered products, chemical instruments and methods, etc., can solve the problems of large heat dissipation on the surface of the slab, poor curing of the adhesive, and inability to continue heating. Low frequency, high production efficiency, and economical and reasonable energy utilization

Inactive Publication Date: 2012-01-18
NANJING FORESTRY UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The ultra-high pressure used in this method is to apply pressure at normal temperature, the cell cavity of the bamboo will be crushed, and the cell wall will also be damaged, resulting in cracks and bamboo stripping defects during use.
High-frequency heating has many advantages in manufacturing bamboo wood slabs and squares with a thickness of more than 100mm, but the following deficiencies are found in the implementation of the above-mentioned Chinese patent application number 200710019222.8: 1. the patent method adopts a load connected in series with a high-frequency oscillation circuit, bamboo / Wood materials are very easy to discharge and breakdown in a high-voltage electric field (8.0-10.5kv), which makes it impossible to continue heating; ②In the method described in this patent, one production cycle can only heat and glue a piece of bamboo / wood heavy wood, and the productivity is low; ③Because The material to be heated between the lower positive plate and the upper negative plate is directly in contact with the upper indenter and the lower frame. During the heating process, the slab surface passes through the upper indenter and the lower frame. The surface temperature is always lower than the core layer temperature, and the curing degree of the adhesive is poor

Method used

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  • Improved method for manufacturing high-frequency heated bamboo/wood recombined material
  • Improved method for manufacturing high-frequency heated bamboo/wood recombined material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Embodiment 1: The load of bamboo and wood is connected in parallel in the high-frequency oscillation circuit of the high-frequency generator; the press adds 1 to 3 positive middle pressure plates and 0 to 2 negative middle pressure plates, and places the positive plate 4 and the negative plate 3 in the middle On the upper and lower surfaces of the pressure plate 5, the negative middle pressure plate is arranged alternately between the positive middle pressure plate, and the upper pressure head 10 of the press machine and the lower frame pressure plate 1 are both negative electrodes, and the heat insulating material is filled between the pole plate and the pressure plate. During processing, the middle pressure plate 5 Place a piece of bamboo or wood plywood slab 7 between the middle platen 5 and the lower frame platen 1 and the upper press head 10 of the press, so that the high-frequency press can glue 2 to 6 Bamboo reconstituted timber, wood recombined timber or bamboo-w...

Embodiment 2

[0029] Example 2: High-frequency hot-press bonding, drying thin bamboo strips with a thickness of 1.2mm, a width of 15mm, and a length of 3.1m to a moisture content of 8-10%, 5 impregnation with phenolic resin (diluted to a solid content of 25%), the amount of impregnation 7% (the ratio of the absolute dry weight of resin and the absolute dry weight of bamboo strips), other is with embodiment 1.

[0030] The physical and mechanical properties of thin bamboo strip reconstituted wood are as follows:

[0031] Size: 3.0m×800mm×150mm

[0032] Density: 0.95~1.1g / cm 3

[0033] MOR∥: ≥120MPa

[0034] MOE∥: ≥11000MPa

Embodiment 3

[0035] Embodiment 3: High-frequency hot-pressing glue, the above-mentioned bamboo strips are processed according to the method described in Embodiment 1; the width of the wooden veneer is about 15mm, the thickness is 1.5-2mm, and the length is 2.6m, dried to a moisture content of 8%, dipped in glue , Dry at low temperature until the moisture content is 8-14%, and then according to the density of 1.0g / cm 3 Calculate and weigh, weigh according to the ratio of bamboo strips and wooden veneer strips (weight ratio) 2:1 (weight ratio), and mix evenly, lay evenly on the pre-pressing baler in the same direction, and start the hydraulic system of the pre-pressing baler after laying, The pressure plate is pressed to the specified pressure, and after compression, it is fastened with plastic straps. During hot pressing, hoist 4 packages into the feeder at the same time, and transport them into the high-frequency heating press at the same time by mechanical means; start the hydraulic stati...

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Abstract

The invention relates to an improved method for manufacturing a bamboo / wood recombined material. The method comprises the following steps of: (1) forming the parallel connection between the load of bamboo wood and a high-frequency oscillation circuit of a high-frequency generator; (2) placing a bamboo recombined material or wood recombined material board blank 7 in the space formed among middle pressure boards 5 and among the middle pressure boards, a lower machine frame 1 and a pressure head 10 in the event of processing; and (3) thermally pressing and gluing at high frequency, specifically comprising: (1) preparing for unit materials; (2) drying the unit materials; (3) gumming and drying again; (4) assembling; (5) pre-pressing and packaging; and (6) heating and gluing at high frequency.The method disclosed by the invention has the advantages that: the problem that surface adhesive becomes fragile because of being excessively solidified or the poor gluing phenomenon because core adhesive is not solidified can be avoided; the good gluing quality is achieved by using lower pressure; the formation gluing pressure of the bamboo / wood recombined material is less than or equal to 8 MPa; and the thermal pressing and gluing period is short.

Description

technical field [0001] The invention relates to an improved high-frequency heating bamboo / wood heavy wood manufacturing method, which belongs to the technical field of bamboo (wood) processing. Background technique [0002] Such as Chinese invention patent publication number CN100999092, its invention name is "a kind of manufacturing method of bamboo strips into material", patent application number 200710019222.8 has described adopting a high-frequency electric field to heat a piece of rubber-containing bamboo strip slab placed between electrodes, so that the inner and outer bamboo strips The invention relates to a method for manufacturing bamboo strips or bamboo recombined timber by uniformly heating and curing bamboo strips and its adhesive at the same time. It has the advantages of fast heating and simultaneous heating of the surface and core layers. This manufacturing method overcomes the disadvantages of using steam contact conduction heating from the surface to the in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B27D1/08B32B37/06B32B37/10B32B38/08B32B21/13B32B21/14
Inventor 张齐生蒋身学林海穆国君朱其孟陈永兴周建华熊晓洪曾樟清
Owner NANJING FORESTRY UNIV
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