Glue laminated wood member with controllable dimensional stability and preparation method thereof

A technology of dimensional stability and glulam, applied in the jointing of wooden veneers, chemical instruments and methods, manufacturing tools, etc., can solve problems such as poor durability, reduced strength, uncontrollable component quality, etc., and achieve low price and variation The effects of reduced durability, extended service life and service safety

Inactive Publication Date: 2013-03-27
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the above-mentioned problems in the prior art that fast-growing wood is used as a raw material for glued wood components, it is necessary to maintain good mechanical properties of the components and improve the dimensional stability of the components. The present invention provides a glued wood component with controllable dimensional stability and its The preparation method is to prepare a high-strength glulam with controllable dimensional stability and contain indented laminates by performing indentation processing on the surface of the glued laminated wood laminates bonded to each other, and filling the indented places with resin, which is effective It effectively solves the problems of delamination or shear failure of the laminates in common glulam components, or the poor durability of glulam components caused by the stress concentration between the laminates due to environmental temperature and humidity changes, or the uncontrollable quality of components made of fast-growing wood. Traditional slotting Removal of wood brings problems such as loss of strength

Method used

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  • Glue laminated wood member with controllable dimensional stability and preparation method thereof
  • Glue laminated wood member with controllable dimensional stability and preparation method thereof
  • Glue laminated wood member with controllable dimensional stability and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] like figure 1 , 3 As shown in and 5, a glulam component with controllable dimensional stability is prepared, which is composed of laminates and adhesive layers under pressure and lamination. , the indentation laminate has intermittent indentations 1 set along the grain direction, the indentation is staggered in the length and width directions of the laminate, and the adhesive layer between the adjacent indentation laminates is the adhesive layer that bonds the surface of the indentation laminate, The indentation is filled with adhesive. There is a laminate with intermittent indentations, and each row and column of indentations are staggered in the length and width directions of the laminate.

[0043] The glulam component is made of structural wood or artificial fast-growing wood through finger joint length, horizontal splicing and thickness stacking in turn. The preparation steps are: (1) Log wood: through mechanical sawing and other processing methods, the The fast...

Embodiment 2

[0052] (1) Logs: Through mechanical sawing and other processing methods, the fast-growing eucalyptus logs are made into specifications with a thickness of 45mm, a width of 200mm and a length of 3000mm. According to the structural design requirements, the inherent decay, knots, Defects such as twill and cracks are eliminated and controlled;

[0053] (2) Indentation: plan the large surface of the standard sawn timber, and process intermittent indentation along the grain direction by mechanical external force. The indentation width is 4mm, and the indentation depth is 1 / 3 of the thickness of the standard timber. The length is 15mm, the clear distance of each row of indentations along the grain direction is 20mm, the clear distance of each row of indentations in the width direction of the laminate is 25mm, and each row of indentations on the same laminate is staggered;

[0054] (3) Drying: By drying, the moisture content of the control laminate is 18%, and the initial drying time ...

Embodiment 3

[0059] The same as Example 1, the length of a single indentation is 8mm, the clear distance of indentations in each row of indentations along the grain direction is 30mm, the clear distance of each row of indentations in the width direction of the laminate is 10mm, and the indentations of the same laminate are staggered along the board width direction. , Compared with the conventional manufacturing method, the glulam components prepared in this way, the test results show that the flexural strength is increased by more than 5%, the flexural modulus of elasticity is increased by more than 10%, and other mechanical properties are not significantly changed. The dry bond strength between boards does not change significantly, and the wet bond strength between laminates increases by more than 20%.

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Abstract

The invention discloses a glue laminated wood member with controllable dimensional stability and a preparation method thereof, belonging to the field of glue laminated wood preparation. The glue laminated wood member with controllable dimensional stability is composed of laminated sheets and adhesive layers through pressed superimposition, wherein each laminated sheet is an indentation laminated sheet which is processed by using solid-wood dimension stocks through transverse widening and longitudinal lengthening, the indentation laminated sheet is provided with continuous or discontinuous indentations along the texture direction, the adhesive layers adhered to the surfaces of the indentation laminated sheets are arranged between adjacent indentation laminated sheets, and adhesives are filled in the indentations. The glue laminated wood member with controllable dimensional stability is prepared through the steps of processing indentations, controlling the moisture content and the like, and the prepared glue laminated wood member with controllable dimensional stability solves the problems that the durability of common glue laminated wood members is poor caused by that middle-layer plates of the common glue laminated wood members are delaminated or subjected to shear failure or the stress between laminated sheets is concentrated due to environment temperature changes, or the quality of members prepared by using fast-growing wood is uncontrollable, the strength of the members is degraded caused by traditional wood removal through slotting, and the like.

Description

technical field [0001] The invention relates to a structural component for building, in particular to a glued wood component with controllable dimensional stability and a preparation method thereof. Background technique [0002] In the mid-1970s, due to its high strength, stiffness and stability and homogeneity of physical and mechanical properties, glued wood was widely used as beams, gate beams, flanges of I-shaped prefabricated grids, and springboards for construction scaffolding, etc. product. The main production process of glued wood is to saw the logs according to certain specifications, dry the sawn timber to a certain moisture content, and carry out stress grading and grading after removing defects; It is formed by overlapping width, longitudinal length and thickness. The configuration characteristics of the wood texture assembly endow the glulam beam with directional high mechanical properties. At the same time, according to different use environments and design r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B27D1/10B27D1/04B27D1/08B32B21/14B32B37/12
Inventor 岳孔霍瑞丽刘伟庆陆伟东刘宇
Owner NANJING UNIV OF TECH
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