Vertical Log Drying with Longitudinal Bore
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Solution Overview
Problem
Current wood drying methods, particularly for hardwoods like beech wood, face challenges such as lengthy drying times, energy inefficiency, and quality degradation, making it difficult to produce high-quality, intact hardwood products without risking fungal growth, cracking, or discoloration.
Innovation Solution
A method involving a longitudinal bore drilled along the entire length of the log, with drying gas flowing through and around it, creating a chimney effect that enhances water evaporation and reduces moisture content uniformly, allowing for efficient drying from both inside and outside, while maintaining the log's integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If artificial drying is used to achieve high quality wood, then quality is improved, but energy consumption increases
Solution Approach 1:
The log is segmented into multiple zones through longitudinal grooves and transverse slots, creating separate drying channels that allow controlled air circulation throughout the wood structure, enabling efficient moisture removal without excessive energy input
Solution Approach 2:
Air acts as an intermediary medium that is introduced through the longitudinal grooves and circulated through the transverse slots to facilitate moisture removal from the wood interior, replacing direct thermal processing with convective drying
2Use of energy by moving object
If air drying is used to reduce energy consumption, then energy consumption is reduced, but drying time increases and wood quality deteriorates
Solution Approach 1:
The wood structure is divided into multiple drying zones using longitudinal grooves and transverse slots, dramatically increasing the surface area for moisture evaporation and enabling faster drying rates while maintaining low energy input through natural convection
Solution Approach 2:
The drying process transitions from surface-only evaporation to three-dimensional moisture removal through the internal network of grooves and slots, allowing simultaneous drying throughout the log volume and significantly reducing total drying time
3Productivity
If traditional drying methods are used on hardwood, then drying occurs, but cracking and warping occur
Solution Approach 1:
Different regions of the log are provided with tailored drying characteristics through varying groove depths, slot positions, and orientations, allowing localized control of moisture removal rates to prevent differential shrinkage that causes cracking and warping
Solution Approach 2:
The interconnected network of longitudinal grooves and transverse slots creates continuous drying pathways throughout the log, ensuring uniform and sustained moisture removal from all regions simultaneously, preventing the stress concentrations that lead to structural defects
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This method enables the safe and efficient drying of hardwood logs, preventing cracking and discoloration, allowing for the production of high-quality products like beams and boards, and increases wood yield by allowing logs to be processed into larger construction elements without warping.
Implementation Method 1
water is extracted from the vertically arranged log by evaporating it on the surface of the longitudinal bore
Implementation Method 2
the drying gas located in the longitudinal bore is moistened and its density is thereby reduced, so that a lift acting on the drying gas is generated within the longitudinal bore
Implementation Method 3
the drying gas located in the longitudinal bore is moistened and its density is thereby reduced, so that a lift acting on the drying gas is generated within the longitudinal bore
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
A method for drying a log (1), wherein the log has a first and a second end face (S1, S2), an outer surface (1f) and an entire length (L), - by creating a longitudinal bore (1b) extending along the entire length (L) from the first to the second end face (S1, S2), such that an inlet opening (lc) is created at the first end face (S1) and an outlet opening (ld) is created at the second end face (S2), wherein the longitudinal bore (1b) has an inner surface (1e), - by holding the log (1) in a substantially vertical position and supplying a drying gas (G) from below the log (1) such that the drying gas (G) also flows through the longitudinal bore (1b), and - by having both the inner surface (1e) and the outer surface (1f) directly exposed to the drying gas (G), so that the log (1) is simultaneously It is dried from the inside (1e) as well as from the outside (1f).