Orthogonal Log Handling for Real-Time Tissue Measurement
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Solution Overview
Problem
Existing methods for measuring log firmness and weight in tissue paper production are not precise and require logs to be fed parallel to their axis, which is incompatible with most production lines, and are affected by deformable winding cores, leading to inaccurate measurements.
Innovation Solution
A device with a feed path orthogonal to the log axis, using pick-up members with load cells for weight measurement and blocking heads for firmness measurement, allowing logs to be picked up, measured, and returned without obstructing the production line, and capable of measuring diameter as well, with a compact design that can integrate into existing lines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If logs are fed parallel to their axis through the measuring device, then firmness measurement can be performed, but the device complexity increases and compatibility with production lines decreases
Solution Approach 1:
The patent inverts the conventional feeding approach by feeding logs orthogonally to their axis instead of parallel, simplifying the device configuration and improving compatibility with production lines while maintaining measurement capability through alternative sensor positioning
2Measurement precision
If a complex measuring system is used to measure firmness, then measurement capability is achieved, but the system is not precise due to compression deformations of the winding core
Solution Approach 1:
The patent extracts the measurement problem from the deforming winding core by measuring firmness on the outer surface of the log, eliminating the interference of core compression deformations and achieving reliable measurements even with thin, deformable cores
Solution Approach 2:
The patent introduces an intermediary measurement approach by using external sensors to measure firmness through the log surface rather than compressing the log directly, avoiding the transmission of measurement errors from the winding core
3Measurement precision
If logs are picked up and measured outside the production line, then measurement can be performed, but real-time correction of production parameters is not possible
Solution Approach 1:
The patent implements continuous real-time measurement of log parameters directly on the production line, enabling continuous feedback and immediate correction of production parameters to maintain consistent log quality
Solution Approach 2:
The patent establishes a feedback loop where measured parameters are immediately used to adjust production parameters, enabling real-time correction of deviations and maintaining optimal production conditions
4Loss of substance
If thin winding cores are used to reduce consumables, then material consumption decreases, but the cores become increasingly deformable and measurement precision decreases
Solution Approach 1:
The patent extracts the measurement from the problematic winding core structure by measuring firmness on the outer log surface, allowing the use of thin, deformable cores without compromising measurement precision
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
The device provides precise, real-time measurement of log parameters, including weight and firmness, without interfering with the production process, and is adaptable to various log lengths and production configurations, improving measurement accuracy and simplicity.
Implementation Method 1
The thrust exerted by the log on the wheel causes lifting of the wheel. The displacement of the wheel is a function of the diameter of the log and of the compressive deformation (compression) of the log caused by the force applied by the wheel.
Implementation Method 2
Located along the feed path is a device for firmness measuring, provided with a wheel positioned at a distance with respect to a surface on which the log is supported, so as to apply a known compressive force to the log
Implementation Method 3
The displacement of the wheel is a function of the diameter of the log and of the compressive deformation (compression) of the log caused by the force applied by the wheel
Data Source
AI summary
A device for providing improved measurements of logs. The device includes a feed path of the logs, configured to feed the logs in a direction orthogonal to the axis of the logs; and one or more pick-up members spaced from one another in a direction transverse to the feed path of the logs. The pick-up members are adapted to pick up individual logs from a pick-up position along the feed path; and transfer each log from the measuring position back to the feed path substantially in the position in which it was picked up.