Susceptor Ink Composition for Lower-Cost Microwaveable Packages

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Solution Overview

Problem

Existing susceptor ink compositions for microwaveable packages are expensive and prone to charring, and conventional methods for applying conductive materials like aluminized PET are costly and complex.

Innovation Solution

A susceptor combination comprising metallic particles, semiconductor materials, and alkaline or alkaline earth metal salts, which can be dispersed in a vehicle to form a susceptor ink composition suitable for conventional printing, providing improved conductivity, processability, and stability under cooking conditions.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If aluminized PET is deposited by vacuum metallisation, then conductive properties are achieved, but manufacturing cost increases significantly

Engineering Contradiction:
Improveconductive propertiesVSAvoidmanufacturing cost
Core Design Contradiction:
ReliabilityVSEase of manufacture

Solution Approach 1:

The patent replaces expensive vacuum metallized aluminized PET with a disposable susceptor ink composition containing metallic particles (aluminum, zinc, or magnesium) dispersed in a binder. This ink can be applied via conventional printing methods, eliminating the need for costly vacuum metallization equipment while providing sufficient conductive properties for microwave heating applications.

Inventive Principle:
Principle #27Cheap short-living objects (Disposable)

Solution Approach 2:

The patent substitutes the mechanical vacuum metallization process with a chemical/colloidal ink application system. The susceptor ink composition uses metallic particles suspended in a binder vehicle that can be applied using standard printing techniques, replacing the complex vacuum deposition machinery with simple, widely available printing equipment.

Inventive Principle:
Principle #28Mechanics substitution (Replace mechanical system)

2Reliability

If silver based ink is used as conductive material, then conductivity is improved, but cost increases and charring occurs at elevated temperatures

Engineering Contradiction:
ImproveconductivityVSAvoidcharring at elevated temperatures
Core Design Contradiction:
ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent changes the material parameters by replacing silver with alternative metals such as aluminum, zinc, or magnesium particles. These materials provide adequate conductivity for susceptor applications while having higher resistance to charring at microwave heating temperatures. The binder composition is also optimized to maintain stability at elevated temperatures up to 200°C.

Inventive Principle:
Principle #35Parameter changes

Solution Approach 2:

The patent creates a composite susceptor ink composition combining metallic particles (aluminum, zinc, or magnesium) with a specially formulated binder system. This composite structure provides both the necessary conductive properties and thermal stability, avoiding the charring issue associated with pure silver ink while maintaining cost-effectiveness.

Inventive Principle:
Principle #40Composite materials

3Device complexity

If conventional printing techniques are used to apply susceptor ink, then process complexity is reduced, but manufacturing precision may be compromised

Engineering Contradiction:
Improveprocess complexityVSAvoidsusceptor quality
Core Design Contradiction:
Device complexityVSManufacturing precision

Solution Approach 1:

The susceptor ink composition is formulated to provide uniform local conductivity through controlled particle distribution in the binder. The ink contains metallic particles at optimized concentrations (e.g., 10-50 wt% aluminum particles) that ensure consistent electrical properties across the printed area, maintaining susceptor quality even when applied by simple conventional printing methods.

Inventive Principle:
Principle #3Local quality

Solution Approach 2:

The patent performs preliminary formulation work to optimize the ink composition before printing. The binder system is pre-designed with appropriate viscosity, drying characteristics, and particle suspension properties to ensure uniform application and consistent susceptor performance. This preliminary optimization allows conventional printing equipment to achieve reliable results without requiring complex precision controls.

Inventive Principle:
Principle #10Preliminary action

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 susceptor ink composition allows for the production of microwaveable packages with enhanced cooking efficiency and optimal organoleptic properties, while maintaining integrity and preventing food contamination.

Implementation Method 1

A susceptor is a material used for its ability to absorb electromagnetic energy and to convert it into heat

Methodology Applied
Scientific EffectMicrowave radiation absorption and conversion to heat: Dielectric Heating

Implementation Method 2

This conductive material is commonly used to transfer the heat to the target by conduction or radiation

Methodology Applied
Scientific EffectThermal conduction: Conduction (thermal)

Data Source

PatentUS12441903B2Susceptor ink compositions for microwaveable packages
Publication Date: 2025.10.14 INST TECHCO DEL EMBALAJE TRANSPORTE Y LOGISTICA ITENE

AI summary

The present invention relates to a susceptor combination comprising: metallic particles; particles of at least two or more semiconductor materials; and one or more alkaline or alkaline earth metal salts; to a susceptor ink composition containing it. It also relates to a laminate comprising a dielectric substrate and the susceptor ink composition printed on the substrate, as well as a microwaveable package comprising the laminate.