Pulsed Electrostatic Field Freezing for Ice Crystal Control
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Solution Overview
Problem
Conventional freezing methods lead to the formation of ice crystals that can destroy cellular and intercellular structures in food products, resulting in degradation of organoleptic properties.
Innovation Solution
Applying a pulsed electrostatic field during the freezing process to inhibit the formation of ice crystals by creating microscopic ultrasonic vibrations that destroy water crystals and prevent their growth.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional freezing methods are used, then the freezing process is simple and fast, but ice crystals form that destroy cellular structures and degrade organoleptic properties
Solution Approach 1:
An electrostatic module is introduced as an intermediary device between the food product and the freezing environment. The module applies pulsed electrostatic fields to the product surface, creating microscopic ultrasonic vibrations that prevent ice crystal formation. This intermediary mechanism allows conventional freezing to proceed while actively preventing the harmful crystallization process.
Solution Approach 2:
The electrostatic module operates by applying pulsed electrostatic fields at specific frequencies (e.g., 20-100 kHz) during the freezing process. These periodic pulses create continuous microscopic vibrations on the product surface, disrupting water molecule arrangement and preventing ice crystal nucleation and growth throughout the freezing cycle.
2Manufacturing precision
If pulsed electrostatic field is applied to inhibit ice crystal formation, then organoleptic properties are preserved, but energy consumption increases
Solution Approach 1:
The electrostatic field is applied only to the surface layer of the food product where ice crystal formation initiates, rather than treating the entire bulk. The pulsed field strength is optimized to exceed the threshold needed for preventing crystal formation at the surface, where the effect is most critical, while minimizing overall energy input. This partial application significantly reduces energy consumption compared to treating the entire product volume.
3Manufacturing precision
If pulsed electrostatic field is applied during freezing, then ice crystal formation is inhibited, but the freezing process time increases
Solution Approach 1:
The electrostatic field is applied during the critical early stages of freezing when water molecules are first beginning to arrange into crystal structures. By preventing ice crystal nucleation at the surface and in the outer layers first, the treatment creates a protective barrier that slows down subsequent heat transfer into the product core, thereby extending the overall freezing time required to reach the target internal temperature.
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
This method effectively preserves the organoleptic properties of food products by reducing the size of ice crystals and preventing cellular destruction, while also accelerating the freezing process.
Implementation Method 1
applying a pulsed electrostatic field to the item for one or more time intervals while freezing the item in the freeze chamber
Implementation Method 2
creating microscopic ultrasonic vibrations on the surface of the item in response to the alternate pulling and accumulating
Implementation Method 3
alternately pulling positively charged particles within the item in a first direction and a second direction opposite to the first direction; alternately pulling negatively charged particles within the item in the second direction and the first direction
Data Source
AI summary
A method to freeze items includes placing an item to be frozen in a freeze chamber of a blast freezer and freezing the item. The method includes applying a pulsed electrostatic field to the item for one or more time intervals while freezing the item. The method may further include, in response to application of the pulsed electrostatic field to the item: alternately pulling charged particles within the item in opposing directions and alternately accumulating charges on a surface of the item opposite to the pulsed electrostatic field. The method may further include creating microscopic ultrasonic vibrations on the surface of the item in response to the alternate pulling and accumulating. The method may further include transmitting the microscopic ultrasonic vibrations internally into the item to inhibit formation of ice crystals within the item during the freezing.