Microwave-Permeable Press Mold Drying for Fiber-Based Blanks

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Solution Overview

Problem

Existing methods for drying fiber-based blanks, such as containers and closure elements, are time-consuming and energy-intensive, and can cause deformation or damage due to uneven drying and external influences.

Innovation Solution

A method involving the use of a microwave-permeable press mold to expose wet fiber-based blanks to microwaves, ensuring uniform drying from all sides while maintaining dimensional stability, using an expandable tool to support the blank and a microwave chamber to reflect and discharge moisture effectively.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Use of energy by stationary object

If conventional drying methods (heating to 180°C) are used, then the fiber-based blank can be dried, but the process is time-consuming and energy-intensive

Engineering Contradiction:

Improveenergy consumptionVSAvoiddrying time

Core Design Contradiction:

Use of energy by stationary objectVSLoss of time

Solution Approach 1:

The patent replaces conventional thermal conduction heating with microwave radiation heating. The microwave-permeable press mold allows microwave energy to penetrate and heat the fiber-based blank internally and uniformly, dramatically reducing drying time and energy consumption compared to conventional external heating methods.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent changes the heating parameter from conventional thermal conduction (heating to 180°C) to microwave radiation frequency (2.45 GHz). This parameter change enables volumetric heating throughout the blank simultaneously, achieving rapid and uniform drying without the time and energy costs of conventional methods.

Inventive Principle:

Principle #35Parameter changes

2Manufacturing precision

If the blank is removed from the mold before drying, then the microwave can access all sides, but the blank is sensitive to force and may become deformed or damaged

Engineering Contradiction:

Improvedimensional stabilityVSAvoiddeformation and damage

Core Design Contradiction:

Manufacturing precisionVSObject-affected harmful factors

Solution Approach 1:

The microwave-permeable press mold serves as an intermediary that allows microwave energy to pass through while providing mechanical support to the blank. The mold's microwave-permeable material (such as PTFE or ceramic) enables uniform microwave access from all sides while the mold structure itself prevents deformation and damage during the drying process.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The press mold performs multiple functions simultaneously: it provides mechanical support to prevent deformation, allows microwave penetration for uniform heating from all sides, and maintains the blank's shape throughout the drying process. This multi-functionality resolves the contradiction between needing mold support and requiring microwave access.

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Ease of operation

If the blank is dried without mold support, then handling is simpler, but uneven drying occurs causing deformation

Engineering Contradiction:

Improvehandling simplicityVSAvoiduniformity of drying

Core Design Contradiction:

Ease of operationVSManufacturing precision

Solution Approach 1:

The microwave-permeable press mold acts as an intermediary that enables uniform drying by allowing microwave energy to penetrate from all sides while maintaining the blank's position and shape. This eliminates the need for complex handling operations while ensuring uniform drying results.

Inventive Principle:

Principle #24Intermediary (Mediator)

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

Achieves low energy consumption and prevents deformation by ensuring uniform drying, reducing water content to 5-12% while maintaining the integrity of the fiber-based blanks.

Implementation Method 1

exposing the wet fiber-based blank to microwaves

Methodology Applied

Scientific EffectMicrowave radiation: Microwave Radiation

Implementation Method 2

The fiber-based blank is provided in a microwave-permeable press mold. By providing the fiber-based blank in a microwave-permeable press mold, the wet fiber-based blank can remain within the mold during the drying process

Methodology Applied

Scientific EffectDielectric heating: Dielectric Heating

Implementation Method 3

a microwave chamber to reflect and discharge moisture effectively

Methodology Applied

Scientific EffectElectromagnetic reflection: Reflection

Implementation Method 4

using an expandable tool to support the blank

Methodology Applied

Scientific EffectMechanical support:

Implementation Method 5

The fiber-based blank is provided in a microwave-permeable press mold

Methodology Applied

Scientific EffectCompression: Compression

Implementation Method 6

microwave-permeable press mold

Methodology Applied

Scientific EffectPermeation: Permeation

Data Source

PatentUS20250321051A1Method and device for reducing the water content in a fibre-based blank

Publication Date: 2025.10.16 ALPLA WERKE ALWIN LEHNER

AI summary

A method and device for reducing the water content in a fiber-based blank. The method comprises the steps of providing a wet fiber-based blank, subjecting the wet fiber-based blank to microwaves. The fiber-based blank is provided in a microwave-permeable press mold.