3D Porous Structure Microwave Drying for Uniform Calcination

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Conventional drying and/or calcination processes for extrusion-based additive manufactured porous structures often result in deformation, damage, and unpredictable mechanical and porous characteristics due to non-uniform heating, making it challenging to produce structures with accuracy and reproducibility.

Innovation Solution

A method involving microwave drying and/or calcination is employed, where the applied microwave energy is tailored based on the structural arrangement and material composition of the porous structure, ensuring uniform heating and controlled removal of moisture, solvent, and organic material without causing adverse effects.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Quantity of substance

If conventional drying and/or calcination processes are used, then the moisture and solvent content is reduced, but the porous structure deforms, cracks form, and mechanical strength is compromised

Engineering Contradiction:

Improvemoisture and solvent contentVSAvoidmechanical strength

Core Design Contradiction:

Quantity of substanceVSStrength

Solution Approach 1:

The patent applies parameter changes by transitioning from conventional thermal drying to microwave-assisted drying. The microwave energy parameters (frequency, power density, exposure time) are optimized to achieve uniform heating throughout the porous structure, enabling effective moisture and solvent removal while maintaining structural integrity and mechanical strength.

Inventive Principle:

Principle #35Parameter changes

2Quantity of substance

If conventional drying and/or calcination processes are used, then the drying is completed, but non-uniform heating causes deformation and damage

Engineering Contradiction:

Improvemoisture and solvent contentVSAvoidstructural accuracy

Core Design Contradiction:

Quantity of substanceVSManufacturing precision

Solution Approach 1:

The patent replaces conventional thermal heating mechanisms with microwave electromagnetic radiation. This substitution enables volumetric heating throughout the porous structure rather than surface-level heating, achieving uniform temperature distribution that prevents deformation and maintains manufacturing precision while effectively removing moisture and solvent.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Productivity

If higher microwave energy is applied, then drying efficiency is improved, but crack formation increases

Engineering Contradiction:

Improvedrying efficiencyVSAvoidcrack formation

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The patent applies partial action by using optimized microwave energy parameters that provide sufficient heating for efficient drying without exceeding the threshold that causes cracking. The microwave power density, exposure time, and frequency are carefully controlled to achieve the minimum necessary energy for effective moisture and solvent removal while preserving structural integrity.

Inventive Principle:

Principle #16Partial or excessive action

4Stability of the object's composition

If microwave energy is tailored to structural arrangement, then uniform heating is achieved, but process complexity increases

Engineering Contradiction:

Improveuniform heatingVSAvoidprocess complexity

Core Design Contradiction:

Stability of the object's compositionVSDevice complexity

Solution Approach 1:

The patent applies self-service by utilizing the inherent structural arrangement and material properties of the porous structure itself to guide the microwave heating process. The microwave energy parameters are optimized based on the known structural characteristics (porosity, geometry, material composition), allowing the structure to essentially determine its own heating uniformity without requiring complex external control systems.

Inventive Principle:

Principle #25Self-service

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 approach enhances the quality and efficiency of the drying and calcination process by reducing shrinkage, crack formation, and preserving the mechanical strength and porosity of 3D printed porous structures, while allowing for customized drying and calcination based on the specific characteristics of the structure.

Implementation Method 1

drying the deposited three-dimensional porous structure by subjecting the porous structure to a heat treatment by irradiating microwave energy through said porous structure

Methodology Applied

Scientific EffectMicrowave heating: Dielectric Heating

Implementation Method 2

the moisture, solvent and/or organic material, solvent and/or organic material content of the porous structures is decreased

Methodology Applied

Scientific EffectEvaporation: Evaporation

Data Source

PatentUS20260001276A1Method and system for manufacturing three-dimensional porous structure

Publication Date: 2026.01.01 VLAAMSE INSTELLING VOOR TECHNOLOGISCH ONDERZOEK NV (VITO)

AI summary

A method and system for manufacturing three-dimensional porous structures. Filaments are deposited in a predetermined interconnected arrangement in a plurality of stacked layers for forming a porous structure with interconnected pores. Furthermore, the porous structure is subjected to a heat treatment in a heat chamber in order to reduce a moisture, solvent and/or organic material, solvent or organic material content (drying and/or calcination) of the porous structure by irradiating microwave energy through said porous structure. The applied microwave energy is selected based on the structural interconnected arrangement of the deposited filaments defining the shape and size of the pores of the three-dimensional porous structure.