Central Dryer Electron Beam Curing Dual Generator
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Solution Overview
Problem
UV radiation systems for curing coatings require photoinitiators, which pose food safety concerns and are expensive, and electron beam curing systems are initially costly due to high procurement costs.
Innovation Solution
A central dryer for electron beam curing with two electron beam generators in a single irradiation unit, allowing flexible and cost-efficient irradiation dose delivery, reducing constructional size and costs, and eliminating the need for photoinitiators.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If UV radiation systems are used for curing coatings, then curing can be achieved, but photoinitiators are required which pose food safety concerns and are expensive
Solution Approach 1:
The patent replaces UV radiation systems with electron beam generators for curing coatings. This substitution eliminates the need for photoinitiators entirely, as electron beams directly initiate polymerization through electron impact rather than requiring chemical photoinitiators. The electron beam system uses electromagnetic fields to generate and control electron beams that cure the coating material without introducing harmful chemical substances.
Solution Approach 2:
The patent changes the fundamental curing parameter from optical (UV light wavelength) to particle radiation (electron beam energy). By using electron beams with adjustable energy levels (typically 50-200 keV), the system achieves curing through electron interaction with coating molecules, fundamentally changing the curing mechanism from photochemical to radiolytic polymerization, thereby eliminating photoinitiator requirements.
2Object-affected harmful factors
If electron beam curing systems are used, then no photoinitiators are required, but procurement costs are very high
Solution Approach 1:
The patent divides the electron beam curing system into multiple independent electron beam generators arranged in series within a single irradiation unit. Each generator can be optimized for specific dose requirements, and the segmented architecture allows for modular procurement and installation, reducing overall system cost compared to a single high-power generator. The web can be irradiated by one or more generators depending on the required dose.
Solution Approach 2:
The patent designs a single irradiation unit that can accommodate multiple electron beam generators and serve multiple coating stations. This multi-functional unit can irradiate webs from different application units, consolidating the irradiation infrastructure and reducing duplicate procurement costs. The unit provides universal electron beam curing capability for various coating types and dosing requirements.
3Reliability
If multiple separate electron beam units are used to provide required irradiation dose, then sufficient curing can be achieved, but procurement costs increase significantly
Solution Approach 1:
The patent merges multiple electron beam generators into a single shared irradiation unit with common infrastructure (vacuum system, control systems, web path). This consolidation allows multiple generators to share costly components such as the vacuum chamber, pumping systems, and control electronics, significantly reducing total procurement costs while maintaining the ability to deliver required irradiation doses through combined or selective operation of the generators.
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 solution enables cost-effective electron beam curing with flexible irradiation dose delivery, suitable for high-speed processing and diverse coating applications, particularly in food packaging, without the use of photoinitiators, thus improving economic feasibility and safety.
Implementation Method 1
an irradiation unit in which at least two electron beam generators are arranged to irradiate the web
Implementation Method 2
The electron beam generators arranged within the irradiation unit have connections for at least one pump system to generate an operating vacuum
Data Source
AI summary
A central dryer for electron beam curing is described which includes a first application unit for the application of a first coating to a web. The central dryer for electron beam curing also includes an irradiation unit in which a first electron beam generator and a second electron beam generator are arranged for the irradiation of the web. The electron beam generators arranged in the irradiation unit have connections for at least one pump system to generate an operating vacuum. In addition to this the central dryer for electron beam curing also has a web guiding system which feeds the web successively but not necessarily in direct succession, to the first application unit, the first electron beam generator, the second electron beam generator.