Carbon Exit Window for Higher-Energy Packaging Sterilization Beams
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Solution Overview
Problem
Existing sterilization apparatuses for packaging materials, particularly those with multilayer structures, face limitations in maximizing the energy of electron beams used for sterilization due to heat buildup in titanium exit windows, which affects device longevity and efficiency.
Innovation Solution
The use of a carbon-based exit window, specifically pyrolytic graphite, in irradiation beam emitting devices allows for higher maximum energy electron beams without excessive heat buildup, thereby improving the sterilization process and extending device lifespan.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a titanium exit window is used in the irradiation beam emitting device, then the device can operate reliably with controlled heat absorption, but the maximum energy of the electron beam must be kept below a certain value to avoid excessive heating
Solution Approach 1:
The patent changes the material parameter of the exit window from titanium to carbon-based material (pyrolytic graphite). This material substitution fundamentally alters the thermal and mechanical properties, allowing the exit window to withstand higher electron beam energies without excessive temperature increase. The carbon-based material has superior thermal stability and lower heat absorption characteristics compared to titanium, enabling the system to operate at higher energy levels while maintaining acceptable temperature levels.
Solution Approach 2:
The patent employs a carbon-based composite material (specifically pyrolytic graphite) for the exit window. This material combines excellent thermal stability, low heat absorption, and high mechanical strength properties. The composite structure allows the exit window to handle higher energy electron beams while maintaining structural integrity and controlling temperature rise, thus resolving the contradiction between maximizing beam energy and controlling exit window temperature.
2Productivity
If the electron beam energy is increased to improve sterilization efficiency, then the sterilization process becomes more effective, but the exit window temperature increases excessively reducing device lifetime
Solution Approach 1:
By changing the material parameter of the exit window to carbon-based pyrolytic graphite, the system can operate at higher electron beam energies that improve sterilization efficiency. The carbon-based material's superior thermal properties prevent excessive temperature rise, thereby extending the device lifetime and allowing sustained high-energy operation without compromising component durability.
Solution Approach 2:
The carbon-based exit window material offers improved resistance to thermal degradation and extended operational life compared to traditional titanium windows. This allows the irradiation beam emitting device to operate at higher energies for longer periods, effectively increasing the stationary object's duration of action while maintaining high productivity in the sterilization process.
3Power
If the maximum energy value of the electron beam is increased, then higher sterilization power can be achieved, but the exit window absorbs more energy and heats up to undesired temperature values
Solution Approach 1:
The patent applies parameter change by substituting the exit window material from titanium to carbon-based pyrolytic graphite. This material has fundamentally different thermal absorption and heat dissipation characteristics. The carbon-based material absorbs less energy and maintains lower temperatures at high power levels, enabling the sterilization apparatus to operate at higher power while controlling the exit window temperature within acceptable ranges.
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 carbon-based exit window maintains lower operating temperatures compared to titanium, enabling higher energy electron beams and enhancing the sterilization efficiency while reducing stress on the device components.
Implementation Method 1
The use of a carbon-based exit window, specifically pyrolytic graphite, in irradiation beam emitting devices allows for higher maximum energy electron beams without excessive heat buildup
Implementation Method 2
Each irradiation beam emitting device comprises a main housing having an inner space and an exit window and an irradiation transmission source arranged within the inner space and configured to generate the electron beam and to direct the electron beam through the exit window
Data Source
AI summary
Sterilization apparatus for the sterilization of a packaging material comprising one or more irradiation beam emitting devices, each one configured to emit an irradiation beam. Each irradiation beam emitting device comprises a main housing having an inner space and an exit window and an irradiation source arranged within the inner space and configured to generate the irradiation beam and to transmit the irradiation beam through the exit window and out of the inner space. The exit window has a window having carbon.