CN109747226A - A kind of composite wooden material - Google Patents

Abstract

The present invention relates to a kind of composite wooden material, which has the density of 200-550kg/m3 and the rigidity of 4000-12000MPa, and the rigidity is measured according to 4 crooked experiments of standard EN789.The composite wooden material includes long fibre and adhesive, and long stapled coefficient of fineness is greater than 30, and adhesive has foaming structure.

Description

A kind of composite wooden material

Technical field

The present invention relates to the composite wooden materials and its production method of a kind of suitable production bearing parts.

Background technique

Material tare weight represents an important material parameter for bearing curved bearing parts.Since tare weight can cause gently Micro- warpage, so low-density and having the material of sufficiently high strength and stiffness than same mechanical performance but highdensity material more has Advantage.

When keeping stiffness and strength constant simultaneously, the reduction of the associated material weight of reduction of density is often in ergonomic It learns and logistics brings many benefits in the middle.Performance advantage associated by lighter weight and cost savings in most basic work just It is able to seem (such as energy consumption when manual operation, design and transport and mobile device), and continues in each stage In operation or in later processing routine, until using (such as assembling of structure division) is finished, it could even be possible to continuing to most After discard.

In in recent years, people are constantly dedicated to reducing the density of composite wooden material.Nearly all light-duty timber framed construction A basic idea be Dagwood sandwich structure, wherein the strong or hard wooden object of material or solid can be in material Fringe region absorption pressure and pulling force, and shearing force and normal force can be mainly transmitted in middle layer.

Therefore, the paper substrate honeycomb plate of decades is being had already appeared by new development and improvement on the market now Experiencing recovery in Wood industry.Although these materials are low-density, their mechanical performance and water resistance is insufficient, institute Bearing can not be used for.

The raising of material property can be realized by the light material of sandwich sandwich structure and foam-like core.So And due to there is high shear load in low-density middle layer, so, in bend loading, low shear strength will lead to serious Deformation.In addition, mechanical property is also almost inadequate for the use as bearing parts.

Currently, production be made of long fibre and adhesive composite wooden material when, it is rope strand shape, microgranular or The timber of fiber can be embedded in adhesive, and then be compressed by compressing Sheet Metal Forming Technology, the pressing plate that adhesive is heat-treated Solidification.This process results in material and significantly compresses, particularly evident in the fringe region of pressed sheet.Therefore, traditional panel material Material, such as hard plate, fiberboard, oriented wood chipboard and special wood materials such as Quetschholz, Scrimber, There are more or less different densities sections in entire plate thickness the case where such as TimTek, Srimtec, SST.In order to enable base There is no density profiles in sheet, and all materials should be by the processing of strength compression, or uses with very low-density Panel material (for example, light weight wood wool board, low density fiberboard etc.).But these materials are since its intensity value is lower, so not It can serve as the material of bearing.

It is released as discussed above, conventional panels and such as Quetschholz, Scrimber, TimTek, Srimtec, SST The wooden component of special timber have passed through strength in production and compress.In addition to the increase of density, this punch process also with timber Cyto-architectural compression (collapse) is related.If absorbing moisture, the expansion of the strong hygroscopicity of timber and cell wall can be reversed partially This deformation.However, this can cause the expansion of compression section, same entire panel material can also expand.

Further, since the compression of marginal zone, we are difficult that heat is introduced into the inside of material to be used in this way Solidify panel material.For this reason, these methods generally rely on the impact of steam, to guarantee enough heat transfers.So And in order to utilize steam impringement, long fibre and/or adhesive must have enough (remaining) moisture.If rushed without steam It hits, the technology implementation of panel production is centainly difficult (especially in the case where less dense planes plate material).

Although experienced a large amount of trial, low density and rigidity had not both been combined in the market yet and has been suitable for bearing member Part in turn avoids the composite wooden material for the disadvantage that compression strap is come in production.Therefore the present invention be exactly in order to make meet it is above-mentioned The composite wooden material of feature.

Summary of the invention

A kind of composite wooden material, the density of the composite wooden material are 200-550kg/m3, preferably 300-550kg/ M3, and the rigidity measured in 4 bend tests according to standard EN789 is 4,000-12,000MPa, preferably 5,000-12, 000MPa, particularly preferred 6,000-12,000MPa, the composite wooden material include draw ratio (fiber and the thickness ratio of length) Long fibre greater than 30 and the adhesive for being characterized as foaming structure；Described adhesive is mainly micropore foaming structure, preferably The aperture that the hole for being 80% is 600 μm with size；For used adhesive in free foaming, can form density is 30- The foams of 300kg/m3, preferred density 80-200kg/m3；Polyurethane system is used as adhesive.

It is especially advantageous to following products using composite wooden material of the present invention: since this kind of product is for outside

Non-protected purpose, in addition to weight, will also dimensional stability and strength and stiffness in contact wetting reservation. Above-mentioned product includes:

--- template product, such as template main beam and part object, such as flange or gusset,

--- coating or uncoated plate and part object, such as middle layer or top layer,

--- working face platform and protective scaffold,

--- the template product of round or flat pattern 1-, 2- or 3- dimension is used for creation or supporting template face,

--- loss template (lostformwork) remains in the part in structure.

The production of product can be benefited using composite wooden material of the present invention, comprising:

--- the timber buildings beam made of solid matter, or have cavity or in which component such as flange or gusset (advantage: Light weight, performance are uniform and without the node in weak spot, such as solid wood；Crossbeam (I type beam or the class of other optimizations can also be produced The beam of metallike beam cross section)),

--- wood structure plate and for furniture structural slab (advantage: in related electrostatic, expansion, moisture resistance, performance and glued board Alike, there are also very light weight and Economic productivity),

--- the part (top layer, middle layer) of wood structure plate,

--- it is directed predominantly perpendicular to the middle layer of machine direction, the middle layer is produced from wooden unit, to be parallel to fiber Direction, by cut perpendicular to machine direction (advantage: it is light-weight, almost without thickness swelling, economical production (such as wave Sa cork wood End grain substitute)),

--- the sandwich battenboard being made of particularly lightweight long fibre middle layer has the load-bearing top made of suitable material Layer has vertical or flat grain middle layer such as veneer, glued board even acrylic panel,

--- " thick wooden boards "-are suitable for the uniform plate material of wall and ceiling, with a thickness of 5 centimetres to greater than 20 centimetres (advantage: weight, heat-insulated, electrostatic, moisture-proof),

--- there are the thick wooden boards of cavity (advantage: seeing above, and weight is lighter, saves material)

--- multiple profiles made of solid material, or it is (excellent with the cavity for being suitable for construction set, window, door and furniture

Point: can be without material loss, electrostatic loss, weight loss when profile produces)

--- for the plate of vehicle manufacture, beam and profile (advantage: weight, electrostatic, moisture-proof)

--- the circle of the timber structure for vehicle manufacture and the part of pancake two and three dimensions molding die, interior decoration With furniture (substantially any shape, electrostatic, weight advantage: can be produced).

Embodiment

Composite wooden material, the density of the composite wooden material are 200-550kg/m3, preferably 300-550kg/m3, and The rigidity measured in 4 bend tests according to standard EN789 is 4,000-12,000MPa, preferably 5,000-12,000MPa, Particularly preferred 6,000-12,000MPa, the composite wooden material include that draw ratio (fiber and the thickness ratio of length) is greater than 30 Long fibre and be characterized as the adhesive of foaming structure；Described adhesive is mainly micropore foaming structure, preferably 80% To have size be 600 μm of aperture in hole；For used adhesive in free foaming, can form density is 30-300kg/m3 Foams, preferred density 80-200kg/m3；Polyurethane system is used as adhesive.

Claims (1)

1. composite wooden material, the density of the composite wooden material is 200-550kg/m3, preferably 300-550kg/m3, and root It is 4,000-12,000MPa according to the rigidity that standard EN789 is measured in 4 bend tests, preferably 5,000-12,000MPa are special Not preferably 6,000-12,000MPa, the composite wooden material include draw ratio (fiber and the thickness ratio of length) greater than 30 Long fibre and the adhesive for being characterized as foaming structure；Described adhesive is mainly micropore foaming structure, preferably 80% It is 600 μm of aperture that hole, which has size,；For used adhesive in free foaming, can form density is 30-300kg/m3's Foams, preferred density 80-200kg/m3；Polyurethane system is used as adhesive.