Microwave-Permeable Press Mold for Uniform Fiber Blank Drying
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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 microwave-permeable press mold with gaps allows moisture to escape while protecting the fiber-based blank from external damage and ensuring uniform drying, using an expandable tool to reduce water content and a forced air flow to accelerate moisture discharge.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If traditional drying methods (compression heating at 180°C) are used, then water content is reduced, but energy consumption increases and drying time is extended
Solution Approach 1:
The patent replaces traditional thermal compression drying with microwave radiation drying. The microwave-permeable press mold allows microwave energy to directly penetrate and heat the fiber-based blank internally, eliminating the need for external thermal compression heating at 180°C. This substitution of mechanical/thermal system with electromagnetic field system reduces both energy consumption and drying time.
Solution Approach 2:
The patent utilizes the phase transition of water from liquid to vapor through microwave heating. The microwave energy causes water molecules to vibrate and generate heat, rapidly converting liquid water to steam that escapes through the press mold structure. This phase transition mechanism enables efficient moisture removal with lower energy input compared to traditional thermal drying.
2Loss of energy
If traditional drying methods are used, then moisture is removed, but the blank becomes deformed or damaged due to uneven drying and external influences
Solution Approach 1:
The patent replaces external thermal compression with internal microwave heating, which provides uniform energy distribution throughout the blank. This eliminates temperature gradients that cause uneven drying and deformation. The microwave-permeable press mold maintains mechanical support while allowing uniform electromagnetic energy penetration, ensuring dimensional stability during the drying process.
Solution Approach 2:
The microwave-permeable press mold acts as an intermediary structure that provides mechanical support and protection to the blank while being transparent to microwave energy. This mold design allows uniform microwave penetration for even drying while preventing external damage and maintaining the blank's shape throughout the drying process.
3Productivity
If the blank is exposed to microwaves from all sides, then drying efficiency improves, but the blank must be accessible from all sides requiring microwave-permeable structure
Solution Approach 1:
The press mold incorporates a porous or microwave-permeable structure that allows microwave energy to pass through the mold walls and reach the blank from all sides simultaneously. This porous design enables uniform multi-directional microwave penetration for efficient drying while maintaining the mold's structural support function. The permeable structure eliminates the need for complex multi-position positioning mechanisms.
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 method achieves low energy consumption and maintains dimensional stability, ensuring a uniform surface quality and efficient moisture removal with minimal deformation.
Implementation Method 1
the press mold is permeable to microwaves... the blank is accessible to the microwaves from all sides and drying can therefore be carried out from all sides
Implementation Method 2
at least one gap is formed inside the press mold through which moisture can escape
Implementation Method 3
an expandable tool is introduced into the wet fiber-based blank... expanding the expandable tool such that moisture displaced by the expansion is discharged
Implementation Method 4
a forced air flow to accelerate moisture discharge
Data Source
AI summary
A press mold (20) for receiving a fiber-based blank, in particular a container (100, 100′, 100″) or a fiber-based closure element (300) for a container (100), for use in a microwave chamber (40). The press mold (20) is permeable to microwaves, and at least one gap (21) through which moisture can escape is formed on the press mold (20) in the closed state of the press mold (20). Additionally described is a method for reducing the water content in a fiber-based blank.