Fibrous Surface Sections for Deep 3D Thermoforming
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The forming of three-dimensional molded parts from fibrous materials, such as cardboard, nonwoven-like airlaid, and other fibrous materials, is restricted by the low moisture content of paper, is subject to significant limitations due to the material properties of natural fibers in the dry thermoforming process, where the maximum elongation is about 2-15% relative to the initial state, and poor flow behavior severely limits the range of possible product geometries (depth, ribs, undercut angles <10°, etc.) for products made from a fibrous material. Paper in particular can only be deformed to a very limited extent, as it begins to tear easily when deformed.
Innovation Solution
The forming of three-dimensional molded parts from fibrous materials, such as cardboard, nonwoven-like airlaid, and other fibrous materials, is restricted by the low extensibility of the material properties of natural fibers in the thermoforming process, where the maximum elongation is about 2-15% relative to the initial state, and poor flow behavior severely limits the range of possible product geometries (depth, ribs, undercut angles <10°, etc.) for products made from a fibrous material. Paper in particular can only be deformed to a very limited extent, as it begins to tear easily when deformed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fibrous material with low moisture content is used in dry thermoforming, then the material properties of natural fibers are maintained, but the maximum elongation is limited to about 2-15% and flow behavior is poor, severely limiting product geometry range
Solution Approach 1:
The fibrous material is divided into multiple layers with different moisture contents. The first layer has lower moisture content (0-30 wt.%) maintaining natural fiber properties, while the second layer has higher moisture content (40-70 wt.%) providing improved elongation and flow behavior. This segmentation allows each layer to fulfill its specific function, resolving the contradiction between maintaining natural fiber properties and achieving better formability.
Solution Approach 2:
The invention creates a composite structure by combining fibrous material layers with different moisture contents. The multi-layer composite consists of a first fibrous material layer (dry or low moisture) and a second fibrous material layer (wet or high moisture), where the layers are arranged in specific configurations. This composite approach allows the dry layer to maintain structural integrity while the wet layer provides enhanced deformability, thus resolving the contradiction between material reliability and geometric adaptability.
2Ease of manufacture
If blanks are completely separated from the web or sheet for individual molding, then each molded part can be formed independently, but separate handling becomes complex and involves high costs, and production time increases
Solution Approach 1:
The web is segmented into multiple molding regions, each capable of being formed into a molded part. However, unlike complete separation, these regions remain connected through a continuous web structure. This segmentation allows independent molding of each region while maintaining connectivity, thus enabling independent manufacturing capability without the drawbacks of complete separation.
Solution Approach 2:
The invention merges the advantages of individual blank handling with continuous web processing. Multiple molding regions are combined into a single continuous web structure, allowing simultaneous or sequential processing of multiple parts. The web connects all molding regions, enabling continuous feed and transport without individual handling, thus improving productivity while maintaining ease of manufacture.
3Ease of manufacture
If blanks are completely separated from the web, then individual molded parts can be formed, but the positioning of individual blanks or products becomes more difficult because they are no longer positioned by a web or sheet
Solution Approach 1:
The invention combines individual molding region independence with continuous web positioning. Each molding region can be independently formed into a molded part, but all regions remain positioned by the continuous web structure. This merging of individual capability with continuous positioning ensures that each blank maintains its precise position during processing, resolving the contradiction between individual part formation and positioning accuracy.
4Adaptability or versatility
If the material layer is completely separated in circumferential regions, then material can be drawn in during forming, but the blank must be handled separately requiring complex transport systems
Solution Approach 1:
The circumferential regions are segmented into multiple portions with complete separations, allowing material to be drawn in during forming. However, the web structure remains continuous between these segmented regions, enabling the material to flow and deform as needed while maintaining overall connectivity. This segmentation allows improved material flow without requiring complex separate handling systems.
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 allows for the formation of three-dimensional molded parts with high mold heights and complex geometries without the need for separate handling of blanks, maintaining their position throughout the production process, and enabling efficient transport and positioning of molding regions.
Implementation Method 1
Surface portions made of fibrous material can be formed into three-dimensional molded parts, such as packaging for food (e.g., bowls, capsules, boxes, lids, etc.) and consumer goods (e.g., electronic devices, etc.), in a forming process under pressure and temperature.
Data Source
AI summary
A surface portion made of fibrous material for processing into a three-dimensional molded part by a forming process, a method for producing a surface portion made of fibrous material for processing into a three-dimensional molded part by a forming process, and a method for producing three-dimensional molded parts from a surface portion made of fibrous material are described. The degree of forming of surface portions can be significantly increased by means of a defined separation of the fibrous material before the forming.