Veneer surface roughness and compressibility test method

A technology of surface roughness and testing method, applied in the fields of wood processing, wood-based panels, and automation, which can solve the problems of limited use, high labor intensity, and unsuitable for online testing.

Inactive Publication Date: 2009-04-15
NANJING FORESTRY UNIV
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  • Claims
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Problems solved by technology

Moreover, these two methods are slow and labor-intensive, and are only suitable for small samples, not suitable for online detection.
In recent years, people have used the method based on machine vision to detect the surface quality of wood, but due to the influence of algorithms, wood vibration and color difference, the use is also very limited

Method used

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  • Veneer surface roughness and compressibility test method
  • Veneer surface roughness and compressibility test method
  • Veneer surface roughness and compressibility test method

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Embodiment Construction

[0021] The present invention will be further described below in conjunction with accompanying drawing.

[0022] 1. Load-displacement curve of the veneer

[0023] For the radial compression of a single plate, the compression process actually goes through four stages ( figure 1 ), the stages of progressive contact, linear elasticity, plastic deformation, and cell wall densification. The first stage is the progressive contact stage, and the contact area between the veneers increases nonlinearly with the increase of the load. This stage directly reveals the interfacial contact between veneer and veneer, veneer and plate and the minimum amount of compression d required to ensure sufficient bonding area and strength min , the corresponding load is the threshold load; the second stage is the linear elastic stage, and the corresponding maximum displacement d max is the yield displacement.

[0024] In practical applications, the ideal compression should be between the minimum requi...

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Abstract

The invention relates to a new measuring method for single-plate surface roughness and compressibility, belonging to the technology field of artificial plate, material processing and automation so on. According to relative theory of primary progressive contacting stage ignored in conventional method in radial compressing test of single plate, the invention provides the new method. When progressive contacting stage ends or linear elastic stage starts corresponding load is threshold load. The displacement under threshold load surface even roughness of single plate can be reflected well. So by measuring the displacement under threshold load surface roughness of single plate can be evaluated. When single plate is compressed in radius and load achieve threshold load, contacting area achieves 80% or more; here the influence of surface roughness can be eliminated basically and corresponding displacement can be used as the minimum compression amount needed by single plate. The invention can be used for measuring single-plate roughness and compressibility quickly and determine the minimum compression amount of single plate and glue consumption under special conditions. Single plate outturn rate and plate bonding quality are improved and it lays a foundation for realizing on-line intelligent decision.

Description

technical field [0001] The invention belongs to the technical fields of wood-based panels, wood processing, automation, etc., and provides a brand-new method for the rapid detection of veneer surface roughness and compressibility, which will help improve the quality of the board and the yield of wood, and reduce production costs . Background technique [0002] A veneer is the basic wood unit for the production of plywood, laminated veneer lumber (LVL) and other composite materials. Roughness is an important indicator for evaluating the surface quality of wood products, which directly affects the compression, adhesive quality, decoration quality and consumption of glue and paint of wood-based panels and wooden parts, and what is the requirement for the surface roughness of wood products? It is also related to the arrangement of processing technology and the determination of processing allowance. [0003] There is currently no widely accepted instrument and ideal method for ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01B21/30
Inventor 王建和赵茂程
Owner NANJING FORESTRY UNIV
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