Freeze Dryer Heating and Wall Cooling for Low-Water Materials
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Solution Overview
Problem
Existing freeze-drying technologies are inefficient for materials with low water content and high sugar content, as they often require freezing, which can damage these materials and prolong the drying process.
Innovation Solution
A freeze dryer system that can operate without freezing the material, utilizing a vacuum pressure to dry materials with low water content, and includes a controller to manage heating and vacuum processes, allowing for faster drying of multiple batches without defrosting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional freeze-drying is used for materials with low water content and high sugar content, then the material can be dried, but the material may be damaged by freezing and the process time is prolonged
Solution Approach 1:
The patent changes the temperature parameter from below-freezing to above-freezing conditions. The freeze dryer operates in a warming phase where the chamber temperature is raised to 32-100°F, allowing the material to be dried without freezing. This parameter change resolves the contradiction by eliminating freezing damage while maintaining drying effectiveness through vacuum pressure and controlled heating.
Solution Approach 2:
The system dynamically adjusts temperature parameters during the drying cycle. The controller varies temperature between 32-100°F based on material moisture content and drying progress. This dynamic temperature adjustment allows the material to be dried efficiently without freezing, resolving the contradiction between material integrity and process time.
2Ease of operation
If the freeze dryer is defrosted between batches, then the chamber is ready for new material, but the process time is increased
Solution Approach 1:
The patent enables continuous operation by eliminating the defrosting step. The chamber remains in a warmed state (32-100°F) throughout operation, allowing multiple batches to be processed without defrosting interruptions. This continuity resolves the contradiction by maintaining chamber readiness while eliminating the time-consuming defrosting period between batches.
3Productivity
If the freeze dryer operates at high temperature, then the drying speed increases, but the material may be damaged by heat
Solution Approach 1:
The controller dynamically adjusts temperature within the 32-100°F range based on material type, moisture content, and drying progress. This dynamic adjustment optimizes drying speed while preventing thermal damage, resolving the contradiction between productivity and material integrity through intelligent temperature management.
Solution Approach 2:
The system uses temperature and humidity sensors to provide feedback to the controller, which adjusts heating power accordingly. This feedback mechanism ensures the material is dried efficiently without exceeding temperature thresholds that could cause damage, balancing productivity with material protection.
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 system effectively dries materials with low water and high sugar content without freezing, reducing processing time and maintaining material integrity, while enabling efficient reuse of the freeze dryer without defrosting between batches.
Implementation Method 1
drying the material by reducing the pressure in the vacuum chamber below ambient pressure
Implementation Method 2
a heating system configured to heat material in the vacuum chamber
Implementation Method 3
a cooling system configured to cool the one or more interior walls of the vacuum chamber
Implementation Method 4
collecting water vapor from the material as ice on the one or more interior walls of the vacuum chamber
Data Source
AI summary
A freeze dryer includes a chamber, a vacuum pump, a cooling system, a heating system, and an electronic controller, which can include a display device. The electronic controller includes a drying process. The drying process includes heating a material in the chamber at or near ambient pressure while simultaneously cooling at least one interior wall of the chamber. In some embodiments, the controller can display options, such as options to heat the material, and receive user input. In some embodiments, the material can be heated to at least 90° F.