Substrate Categorizing Machine for Banknote Quality Control
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Solution Overview
Problem
Current methods for producing and categorizing substrates for securities, such as banknotes, lack efficient processes for identifying and sorting defective or substandard materials, leading to potential misuse of valuable substrates and production of unusable securities.
Innovation Solution
A method and substrate processing machine that inspects and categorizes sheets based on properties like defects, security features, and quality, separating them into three categories: good, scrap, and mixed, to optimize substrate usage and prevent further processing of unusable materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If substrate inspection and categorization processes are implemented, then substrate quality control and security feature verification are improved, but processing time and operational complexity increase
Solution Approach 1:
The inspection process is performed before the substrate is cut into individual sheets, allowing defects to be identified in the continuous web form. This preliminary inspection enables categorization decisions to be made before irreversible processing steps occur, improving quality control while minimizing waste of processing time on defective material.
Solution Approach 2:
The substrate web is divided into three distinct categories (good, scrap, mixed) with separate delivery piles for each category. This segmentation allows operators to quickly identify and route substrates to appropriate processing streams without time-consuming manual assessment, balancing thorough inspection with efficient processing.
2Measurement precision
If thorough inspection of substrate properties is conducted, then categorization accuracy is improved, but device complexity and inspection time increase
Solution Approach 1:
The inspection device is designed to evaluate multiple substrate properties (defects, security features, watermarks, overall quality) using a single integrated system rather than separate specialized devices for each property. This multi-functional approach maintains high categorization accuracy while avoiding the complexity of multiple independent inspection systems.
Solution Approach 2:
The inspection process combines assessment of various substrate characteristics into a unified evaluation that results in three clear categories. By merging multiple inspection criteria into a single categorization decision framework, the system achieves comprehensive quality assessment without proportionally increasing device complexity.
3Productivity
If substrate categorization into multiple categories is implemented, then substrate utilization efficiency is improved, but operational complexity increases
Solution Approach 1:
Different categories of substrates (good, scrap, mixed) are directed to different processing streams or delivery locations based on their specific quality characteristics. This local quality approach ensures that each substrate type receives appropriate handling and processing, maximizing utilization efficiency while keeping operational procedures straightforward through clear categorical differentiation.
Solution Approach 2:
The inspection and categorization system automatically assigns substrates to appropriate delivery piles based on inspected properties, reducing the need for manual assessment and decision-making by operators. This self-service categorization maintains high substrate utilization efficiency while simplifying operational complexity by eliminating subjective judgment requirements.
Data Source
Figure 1a
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Figure 2
AI summary
The invention relates to a method for separating and categorizing at least one substrate (02; 03) that originates from a sheet source (47) or is transported in the form of a material web (02) to a cross-cutting apparatus and is separated into a multiplicity of sheets (03) there, wherein the respective sheets (03) are inspected in respective inspection operations with regard to at least one property that the substrate (02; 03) already had before the particular separating operation or severing operation, and wherein the sheets (03) are each assigned to one of at least three categories in an assigning operation on the basis of the result of the inspection carried out in the particular inspection operation, and wherein each of the sheets (03) is deposited on a delivery pile (06; 07; 08) corresponding to its category, and to a substrate categorizing machine (01), which has a sheet source (47) or a material-web source (09) and a cross-cutting device (11), wherein the substrate categorizing machine (01) has, downstream of the sheet source (47) or downstream of the cross-cutting device (11), a sheet transport device (12) having a gripper system (13), and an inspection device (14; 16; 17; 18), and, downstream of the inspection device (14; 16; 17; 18), a delivery apparatus (19), which has at least three depositing stations (21; 22; 23).