Fibrous Molded Part Surface Recesses for Steam Venting
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Solution Overview
Problem
Molded parts made from fibrous materials often have visible and tactile protrusions due to steam extraction during pressing, which affect design aesthetics and functionality, particularly in applications like coffee capsules and drinking cups, leading to reduced demand and functional limitations.
Innovation Solution
The integration of design and functional elements with gradually decreasing material thickness, allowing for recessed areas that incorporate decorative or informational elements without protruding beyond the surface, achieved through a molding process with specific mold design elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If steam extraction openings are provided on mold surfaces during pressing, then steam can be extracted from the fibrous material, but raised areas form on the molded part surface affecting aesthetics and functionality
Solution Approach 1:
The patent applies local quality by providing steam extraction openings only in specific regions of the mold surface where steam accumulation is problematic, rather than uniformly across the entire surface. This allows steam extraction functionality to be localized to areas where it is needed, preventing raised areas in critical regions while maintaining overall surface flatness.
Solution Approach 2:
The patent resolves the surface flatness issue by transitioning from a two-dimensional surface problem to a three-dimensional solution. Molding elements are introduced that extend into the mold cavity, creating localized depth variations that accommodate steam extraction openings without compromising the external surface flatness of the molded part.
2Adaptability or versatility
If natural fibers are used in fibrous material, then sustainability and recyclability are improved, but protrusions from steam extraction reduce demand for these eco-friendly molded parts
Solution Approach 1:
The patent maintains the sustainability benefit of natural fibers while addressing surface quality by implementing localized steam extraction openings in the mold. This allows the eco-friendly material property to be preserved while the molding process is optimized to prevent surface defects in the final product.
3Loss of energy
If raised areas are present on molded part surface, then steam extraction is facilitated, but the molded parts do not sit flush with contact surfaces preventing sufficient seal
Solution Approach 1:
The patent resolves the sealing issue by applying local quality - steam extraction openings are provided only in non-critical regions of the mold surface, away from areas that require flush contact for sealing. This localized approach allows steam extraction where needed while preserving surface flatness where sealing is required.
Solution Approach 2:
The patent uses molding elements that extend into the mold cavity to create a three-dimensional solution. These elements provide the necessary steam extraction pathways while maintaining a flat external surface that can sit flush with contact surfaces for reliable sealing.
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 solution ensures that the molded parts have a seamless appearance and functionality by integrating design elements that are barely perceptible, addressing both aesthetic and functional issues while using sustainable fibrous materials.
Implementation Method 1
the evaporating water is routinely extracted during pressing at high temperatures and pressures
Implementation Method 2
steam extraction can occur during pressing at high temperatures and pressures
Data Source
Figure 1
Figure 2
Figure 3a~4
AI summary
A three-dimensional molded part made of fibrous material and a molding tool for producing molded parts made of fibrous material are described, wherein the three-dimensional molded part is produced in a manufacturing process under pressure and thermal influence, wherein a surface of the molded part has at least one design element and/or functional element, which is formed by at least one area with reduced material thickness, wherein the material thickness of the at least one area decreases with an increasing molded part height in one molding direction.