Veneer Stack Profiling for Accurate Sheet Grading and Unstacking
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Solution Overview
Problem
Current methods and systems for veneer inspection, grading, and stacking in layered wood products are antiquated, inefficient, and error-prone, leading to inaccurate grading, inconsistent stacking, material waste, safety hazards, and worker fatigue.
Innovation Solution
A method and system utilizing veneer analysis systems to collect dimensions and quality data, record location data, and correlate this information into a stack profile, enabling precise identification and handling of veneer sheets during stacking and unstacking processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If automated veneer stacking systems are implemented, then productivity and consistency are improved, but device complexity increases
Solution Approach 1:
The stacking system is divided into separate functional modules: a scanner module for capturing veneer images, a processor module for analyzing dimensions and quality, and a stacker module for physical stacking. This segmentation allows each module to be optimized independently while working together as an integrated system, improving productivity without overwhelming complexity.
Solution Approach 2:
The system creates a digital representation (image) of each veneer sheet and processes this copy to determine stacking parameters. By working with the digital copy rather than directly manipulating the physical veneer for decision-making, the system achieves high-speed automated grading and stacking placement without requiring complex mechanical measurement devices.
2Manufacturing precision
If manual veneer grading and stacking is performed, then device complexity is reduced, but manufacturing precision and reliability deteriorate
Solution Approach 1:
The system replaces manual visual inspection and physical measurement with an automated imaging and processing system. The scanner captures digital images of veneer sheets, and the processor automatically analyzes dimensions, identifies defects, and determines quality grades, eliminating human error and subjectivity while maintaining relatively simple hardware.
3Loss of information
If veneer sheets are stacked without accurate tracking, then device complexity is reduced, but loss of information about stack composition occurs
Solution Approach 1:
The system introduces a data structure called a 'stack profile' that acts as an intermediary between the physical stacking process and the information about stack composition. The stack profile records the sequence, dimensions, and quality characteristics of each veneer sheet as it is stacked, preserving complete information without requiring complex real-time tracking hardware.
4Productivity
If high-speed automated stacking is implemented, then productivity is improved, but measurement precision may deteriorate due to motion blur or timing issues
Solution Approach 1:
The scanner captures the image of each veneer sheet immediately upon arrival at the scanning position, before the sheet is moved to the stacking location. This preliminary capture of measurement data ensures high precision dimensions are recorded while the sheet is stationary or moving slowly, eliminating motion blur issues that would occur with high-speed scanning during the actual stacking motion.
Data Source
AI summary
A method and system for stacking and unstacking of veneer includes using one or more veneer analysis systems to collect dimensions and quality data associated with the veneer being used to create a stack of veneer. In addition, location data for the veneer in the stack of veneer is recorded. The dimensions data, the quality data, and the location data for all the veneer in a stack of veneer is then combined into a stack of veneer profile data. The stack of veneer profile data is then correlated to the stack of veneer and stored in a database. Consequently, the location, quality, and dimensions data of the veneer making up the stack of veneer is known so that an accurate determination can be made of the volume, surface area and quality of veneer in the stack. In another example, 3D laser profiling is used to identify a veneer sheet portion that is at the top of a stack of veneer sheet portions so that the veneer sheet portion at the top of the stack can be identified and removed from the stack during unstacking.