Structural laminwood and preparation method thereof

A technology for glulam and structure, applied in the field of wood processing, can solve problems such as differences in test methods, high product prices, inconsistent product size systems, etc., and achieve good structural performance

Inactive Publication Date: 2009-10-28
INST OF WOOD INDUDTRY CHINESE ACAD OF FORESTRY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the imported glulam mainly has the following disadvantages: one is the high product price, the other is the inconsistent product size system, and there are differences in testing methods

Method used

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  • Structural laminwood and preparation method thereof
  • Structural laminwood and preparation method thereof
  • Structural laminwood and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0057] First, the plantation fir (diameter at breast height: 20-35cm) log is processed into a standard timber with a cross-sectional size of 45mm (T) × 90mm (W) and a length (L) of about 2000mm as a finger-joint unit. The moisture content of each finger-joint unit is controlled at 10-15%. There are no knuckles, cracks and other defects within 5cm from the finger joint end.

[0058] According to the following grading table, the plantation fir lumber is divided into four grades by directly measuring the flexural modulus of elasticity through a bending grading machine.

[0059]

[0060] Place the finger-joint end of the finger-joint unit upright for tooth milling, and mill out 25mm or 30mm finger-joint long teeth according to the fitting degree (t) of 0.3-0.4mm, with a slope of 1 / 10 or 1 / 12. Use structural glue resorcinol-formaldehyde to paint on one side, and the amount of glue on one side is 0.2g / cm 2 ~0.4g / cm 2 (Within this range, the difference in the amount of glue app...

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Abstract

The invention provides a structural laminwood and a preparation method thereof. The laminwood is stacked and glued by 2-7 layers of veneers, wherein the grade of the external layer veneer of the laminwood is equal to the grade of the adjacent internal layer veneer or higher than the adjacent internal layer veneer by one grade; the veneer grade is determined by the average value of flexural elastic modulus of the target grades of all veneers; and compared with the veneers with lower grades, the veneers with higher grades have greater average value of the flexural elastic modulus of the target grades. The method lengthens the stock lumbers of short dimensions by mechanical stress grading and uses the lengthened stock lumbers as the veneers, then configures the veneer structures according to a grade configuration principle and coldly presses and glues the veneers to prepare the structural laminwood. The laminwood has excellent structural performance and can be used for the components such as beams, columns, and the like in wood structure buildings or other buildings.

Description

technical field [0001] The invention relates to a glued wood and a manufacturing method thereof, in particular to a structural glued wood which can be used for beams, columns and other components in a wooden structure building or other buildings and a manufacturing method thereof, and belongs to the technical field of wood processing. Background technique [0002] Glued wood was produced in the 1890s, but it was introduced into my country in the 1980s, and has a history of nearly 30 years in our country. There are two main types of domestically produced glulam: structural and non-structural. The output of non-structural glulam is relatively large, and there are many manufacturers. The products are mainly used in furniture, decoration and other fields; Grading and configuration. There are few manufacturers of structural glulam, and all products are exported abroad; the tree species used are mainly imported Russian sylvestris pine; the processing size and strength classifica...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B27D1/04B27D1/10B27D1/08B27D1/06B27D5/00B27F1/16B32B21/13B32B21/14B32B7/12
Inventor 周海宾任海青费本华
Owner INST OF WOOD INDUDTRY CHINESE ACAD OF FORESTRY
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