Vacuum Freeze Drying with Fins and Automated Control
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Solution Overview
Problem
Vacuum freeze drying processes are complex, require expensive equipment, and can result in brittle products or incomplete drying due to inadequate cooling rates, temperatures, and pressure control, especially when using generic settings for different products.
Innovation Solution
A fully automatic vacuum freeze drying apparatus and method using a controller unit and database to select specific freeze drying settings, including temperatures, pressures, and cooling rates, with elongate heat exchange tubes having radially arranged fins to accelerate freezing and reuse water vapors for heat, ensuring optimal product preservation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional vacuum freeze drying is used with generic settings, then the process is simpler to operate, but the cooling rate is insufficient causing large ice crystals and brittle products
Solution Approach 1:
The freeze drying process is divided into distinct stages (freezing stage, primary drying stage, secondary drying stage) with specific temperature, pressure, and humidity parameters for each stage. This segmentation allows optimization of cooling rates and sublimation conditions to prevent large ice crystal formation while maintaining manageable system complexity through automated control.
Solution Approach 2:
The system dynamically adjusts multiple parameters including temperature (-30°C to -50°C freezing temperature), pressure (vacuum level control), and humidity during different drying stages. These parameter changes enable precise control over ice crystal formation and sublimation rates, preserving product microstructure without requiring overly complex manual intervention.
2Reliability
If cooling temperature is not sufficiently low, then the process is easier to control, but water and solutes are not completely removed rendering the process ineffective
Solution Approach 1:
The system incorporates sensors and controllers that continuously monitor temperature, pressure, and humidity levels, automatically adjusting parameters to maintain optimal conditions for complete water and solute removal. This feedback mechanism ensures reliable drying completeness while simplifying operation through automated temperature control rather than manual adjustment.
Solution Approach 2:
The freeze drying process uses dynamic temperature profiles that transition from rapid cooling (-30°C to -50°C) during freezing to controlled warming during sublimation. This dynamic approach ensures complete removal of water and solutes while maintaining ease of operation through automated programmatic control of temperature changes.
3Shape
If pressure and temperature are not carefully controlled, then the process is simpler to operate, but the product may collapse destroying the product
Solution Approach 1:
The automated control system continuously monitors pressure and temperature parameters, making real-time adjustments to prevent product collapse. This feedback control maintains the delicate balance between sublimation rate and structural integrity, preserving product shape without requiring complex manual coordination of multiple parameters.
Solution Approach 2:
The system employs dynamic pressure and temperature profiles that coordinate changes during different drying stages. Pressure is maintained at vacuum levels during sublimation while temperature is gradually adjusted, creating controlled dynamic conditions that prevent structural collapse while simplifying operation through automated sequencing.
4Adaptability or versatility
If different products use different specific settings, then optimal product quality is achieved, but the process becomes more complex requiring individual configuration
Solution Approach 1:
The freeze drying system is designed with a universal automated control architecture that can handle multiple product types through pre-programmed parameter sets. Different products (fruits, vegetables, meats, pharmaceuticals) use different temperature, pressure, and humidity profiles, but the same hardware platform and control system accommodate all variations, achieving adaptability without proportionally increasing device complexity.
Solution Approach 2:
The system achieves product-specific optimization by changing operational parameters (temperature ranges from -50°C to ambient, pressure levels, humidity control) rather than requiring different hardware configurations. This parameter-based adaptability allows versatile handling of diverse products while maintaining a standardized equipment platform.
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 provides precise control for each product type, preserving microscopic structures, conserving energy, and preventing structural collapse, resulting in high-quality, efficiently produced freeze-dried products with minimal human intervention.
Implementation Method 1
accelerating a freezing rate in the dryer unit by using the plurality of elongate heat exchange tubes having radially arranged fins
Implementation Method 2
a vacuum pump unit
Implementation Method 3
an ice condenser unit equipped with a plurality of elongate heat exchange tubes having radially arranged fins
Implementation Method 4
Sublimation is achieved when a product changes its phase from the solid phase directly into the gaseous phase without passing through the liquid phase
Implementation Method 5
a refrigerator unit
Data Source
AI summary
A convection current vacuum freeze drying method and a computer software program for manufacturing a product are disclosed which include: selecting specific freeze drying settings from a Database for a specific product; loading the specific freeze drying settings into a controller for fully controlling of the convection current freeze drying process; performing the convection current freeze drying process using an ice condenser unit equipped with a plurality of elongate heat exchange tubes having radially arranged fins; determining whether the convection current freeze drying process is operated in accordance to the specific freeze drying settings using a plurality of sensors and the controller, if the specific freeze drying settings are not corrected, then readjusting the specific freeze drying settings using the controller, and if the specific freeze drying settings are correct then packaging product.