Security Paper Window Elements Suction Fiber Removal
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Solution Overview
Problem
Existing methods for producing security paper with visible window security elements on both sides are limited in their ability to efficiently embed and display multiple security threads without increasing the paper's thickness or compromising its flatness and uniformity.
Innovation Solution
A device that forms two paper webs with embedded security elements, where one web has a security thread visible on one side and another web has a security element embedded between the two, with paper fibers removed using a suction and/or flushing device to create window areas, allowing both elements to be visible on opposite sides without excessive thickness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple security threads are embedded in security paper to enhance authentication, then the security features become more reliable, but the paper thickness increases and flatness deteriorates
Solution Approach 1:
The patent creates window areas by removing paper fibers in specific regions, transforming the security thread embedding from a three-dimensional bulk embedding to a two-dimensional surface-visible structure. This allows multiple security threads to be visible on opposite sides of the paper without increasing overall thickness, as the threads are positioned in different spatial planes rather than stacked vertically.
Solution Approach 2:
The paper structure is segmented into distinct regions: window areas where fibers are removed to expose security threads, and non-window areas where fibers remain to maintain paper integrity. This segmentation allows selective visibility of security elements without compromising the overall structural flatness of the paper.
2Reliability
If multiple security threads are embedded in security paper to enhance authentication, then the security features become more reliable, but the paper uniformity deteriorates
Solution Approach 1:
The paper structure exhibits local quality variation: window areas have removed fibers to expose security threads, while non-window areas maintain normal fiber density and structure. This localized modification allows security threads to be visible in specific regions without affecting the overall uniformity and quality of the paper in other areas.
3Difficulty of detecting and measuring
If window areas are created by removing paper fibers to expose security threads, then security element visibility is improved, but the manufacturing process complexity increases
Solution Approach 1:
The patent extracts paper fibers from specific regions to create window areas, removing only the necessary material to expose security threads while leaving the rest of the paper structure intact. This extraction approach is simpler than adding complex embedding mechanisms, as it involves selective removal rather than complex placement procedures.
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 production of security paper with multiple visible security elements on both sides, enhancing authenticity verification while maintaining paper flatness and uniform thickness, suitable for high-quality documents like banknotes and admission tickets.
Implementation Method 1
paper fibers are removed from the second paper web while it is still moist by means of a suction and/or rinsing device
Implementation Method 2
paper fibers are removed from the second paper web while it is still moist by means of a suction and/or rinsing device
Data Source
Figure 1~2
Figure 3(a)~4
AI summary
The invention relates to a device (10) for producing a security paper having at least two endless visible window security elements on opposite sides of the security paper, comprising a first paper layer production device (12) for forming a first paper web (20) and for introducing a first endless security element (22) as a window security element into the first paper web (20) during the formation of sheets, a second paper layer production device (14) for producing a second paper web (30), a take-off belt (16) for merging the second paper web (30) with and fixedly joining the second paper web to the first paper web (20), an apparatus for feeding a second endless security element (32) between the first and second paper webs as the paper webs (20, 30) are merged, and a suction device (50) for removing paper fibers from the second paper web (30) in the yet moist state. The invention further relates to an associated method and to a corresponding multi-layer security paper and document of value.