Microgloss Sensor for Paper Surface Gloss Variation Detection
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Solution Overview
Problem
Conventional gloss sensors are unable to detect micro-level gloss variations on surfaces, resulting in products with the same average gloss value appearing differently to consumers due to internal gloss variations, which are not measurable.
Innovation Solution
A method and sensor system that illuminates a target surface at a predetermined angle, detects reflected light at the same angle, and generates a two-dimensional light intensity distribution profile to calculate microgloss values, providing a detailed representation of how light is reflected over a surface area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional gloss sensors are used to measure paper surface gloss, then the average gloss value can be obtained, but micro-level gloss variations cannot be detected
Solution Approach 1:
The patent divides the measurement task into two distinct components: conventional gloss measurement and microgloss measurement. The sensor system is segmented to include separate detection pathways - one for measuring average reflectance (conventional gloss) and another for measuring light intensity distribution patterns (microgloss). This segmentation allows each component to be optimized independently, resolving the contradiction by enabling micro-level detection without requiring a complete redesign of the entire measurement system.
Solution Approach 2:
The patent transitions from one-dimensional conventional gloss measurement (single average value) to two-dimensional microgloss measurement (spatial distribution pattern). By adding the spatial dimension to the measurement, the system can detect micro-level variations while still providing conventional gloss values. This dimensional enhancement resolves the contradiction by capturing both average properties and local variations simultaneously.
2Loss of information
If conventional gloss measurement is performed, then average gloss value is obtained, but products with same average gloss appear different to consumers due to undetected internal variations
Solution Approach 1:
The patent implements continuous microgloss measurement capability that operates simultaneously with conventional gloss measurement. The sensor system continuously captures light intensity distribution patterns across the paper surface without interrupting the production flow. This continuous measurement approach eliminates information loss about micro-variations while maintaining productivity, as both measurement types occur in real-time during normal operation.
Solution Approach 2:
The patent introduces an intermediary processing layer that analyzes the two-dimensional light intensity distribution patterns to extract microgloss characteristics. This intermediary analysis layer processes the raw optical data to generate meaningful microgloss metrics without requiring additional measurement time. The intermediary computation enables simultaneous extraction of both conventional gloss and microgloss information from the same optical measurements.
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
Enables the detection of micro-level gloss differences, allowing for more accurate evaluation of aesthetic features and process control in papermaking, leading to improved product quality and consistency by providing both microgloss and conventional gloss values.
Implementation Method 1
Conventional gloss sensors are unable to detect micro-level gloss variations on surfaces, resulting in products with the same average gloss value appearing differently to consumers due to internal gloss variations
Data Source
AI summary
Microgloss is a novel two-dimensional representation of how light is reflected from a target surface area. Systems and methods for measuring the microgloss can yield data for characterizing the reflective properties of a variety of products for which surface appearance is important. These products include paper, plastics, metals, and ceramics. Microgloss characteristics can be used as parameters for controlling the supercalendering process in papermaking. Microgloss characteristics can be used in conjunction with standard gloss to classify products.