Security-Document Varnish Drying With Negative-Pressure Extraction
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Solution Overview
Problem
Conventional drying devices for identification, valuable, and security documents release harmful substances and unpleasant odors during the drying process, posing environmental and health risks.
Innovation Solution
A drying device with a dual-shell housing and separate air supply and extraction systems, where hot air is directed from one direction and extracted from another, ensuring immediate removal of pollutants and odors, and featuring a nozzle plate for uniform air distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If hot air drying is used to dry the varnish on the blank, then the drying efficiency is improved, but harmful substances and unpleasant odors are released into the environment
Solution Approach 1:
The invention extracts harmful substances and odors from the drying chamber using a dedicated extraction fan. The extraction fan creates negative pressure that draws out the gas mixture containing pollutants released during hot air drying, preventing their release into the environment while maintaining efficient drying conditions.
Solution Approach 2:
The invention introduces an intermediary extraction system that mediates between the hot air drying process and the environment. The extraction fan acts as an intermediary device that captures harmful substances at the source and removes them through a controlled pathway, preventing direct release into the surrounding environment.
2Device complexity
If the drying housing is formed as a single piece, then the structure is simple, but it is difficult to adapt to different card formats and sizes
Solution Approach 1:
The drying housing is segmented into a first half-shell and a second half-shell that can be separated from each other. This segmentation allows the housing to be opened and adjusted to accommodate different card formats and sizes, while maintaining a relatively simple overall structure when assembled.
3Device complexity
If air supply and exhaust are located on the same side of the device, then the device structure is simplified, but the drying uniformity and pollutant removal efficiency are reduced
Solution Approach 1:
The invention transitions from a single-side air supply and exhaust configuration to a multi-dimensional arrangement where air is supplied from one side of the drying chamber and exhaust is extracted from the opposite side. This spatial distribution improves both drying uniformity across the blank surface and pollutant removal efficiency by creating more effective air flow paths.
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 ensures low pollutant emission and uniform drying by preventing the escape of harmful substances into the environment, enhancing safety and efficiency.
Implementation Method 1
a hot air blower (110) which is fluidically connected to the receiving space (108) such that an air flow generated by the hot air blower (110) is directed to the receiving space (108), wherein the generated air flow has a temperature that is higher than room temperature
Implementation Method 2
an extraction fan (112) which is fluidically connected to the receiving space (108) such that a negative pressure generated by the extraction fan (112) leads to the extraction of the gas mixture present in the receiving space (108)
Data Source
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AI summary
Drying device (100) for drying a varnish on a blank (200) of an identity, value or security document, comprising: - a drying housing (102) which provides a receiving chamber (108) for receiving the blank (200); - a hot air blower (110) which is fluidly connected to the receiving chamber (108) such that an airflow generated by the hot air blower (110) is directed to the receiving chamber (108), wherein the generated airflow has a temperature that is higher than room temperature; and - an extraction blower (112) which is fluidly connected to the receiving chamber (108) such that a negative pressure generated by the extraction blower (112) leads to the extraction of the gas mixture present in the receiving chamber (108). The invention also relates to a method for drying a lacquer on a blank (200) of an identity, value or security document.