Fibrous Molded Weak Point Structure for Easy Puncture and Sealing
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Solution Overview
Problem
Existing designs for perforable weak points in molded parts made of fibrous material either fail to provide a reliable sealing effect or are difficult to open without damaging the part, and they lack consistency in performance across multiple molded parts.
Innovation Solution
A method involving complete cutting through an area of the fibrous material followed by pressing the cut surfaces together to create a force-fit connection, forming a penetrable weak point that maintains structural integrity and allows easy opening.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the layer thickness is reduced in the weak point area, then the weak point becomes easier to puncture, but the weak point tears when punctured due to fiber extension
Solution Approach 1:
The fibrous material is completely cut through at the weak point area, separating the material into distinct sections. This segmentation allows the weak point to be punctured without fibers extending across the entire weak point into the connected area, preventing tearing while maintaining ease of puncturing.
Solution Approach 2:
The weak point area is treated differently from the rest of the material by completely cutting through it, creating a localized separation. This local quality change ensures that the weak point has different structural properties (complete separation) compared to the connected areas, allowing easy puncturing without damaging the surrounding structure.
2Stability of the object's composition
If completely cut through areas are pressed together, then a force-fit connection is created that maintains structural integrity, but the connection strength is reduced compared to the remaining area
Solution Approach 1:
The fibrous material is completely cut through before pressing, creating separation surfaces. These pre-created surfaces are then pressed together to form a force-fit connection. The preliminary cutting action allows the subsequent pressing to create a controlled weak point that maintains structural integrity while providing the necessary strength reduction for easy opening.
3Reliability
If weak points are designed to provide sufficient sealing effect, then barrier properties are improved, but the weak points become very difficult to open
Solution Approach 1:
The complete cutting through of the fibrous material creates a clear separation that forms a weak point. This segmentation allows the weak point to be easily opened while the pressing operation creates a force-fit connection that maintains sufficient sealing effect in the connected areas.
Solution Approach 2:
The weak point area is locally separated by complete cutting, creating a distinct quality difference between the weak point and connected areas. This local quality change enables easy opening at the weak point while maintaining barrier properties in the connected areas through the force-fit connection.
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 consistent, easy opening of molded parts with sufficient barrier and sealing properties without damaging the surrounding area, facilitating reproducible production of identical weak points across multiple parts.
Implementation Method 1
pressing together the at least one previously completely cut through area, wherein the fibrous material in the at least one cut through area is pressed against itself and thereby creates a connection in the at least one area which is weaker than the connection of the fibrous material in the remaining area
Data Source
Figure 1a~1d
Figure 2a~2f
Figure 3a~5b
AI summary
A method for producing a perforable weak point in molded bodies made of fibrous material, a tool for producing a perforable weak point in molded bodies made of fibrous material and a molded body made of fibrous material are described, comprising at least one surface section which has at least one area with a perforable weak point.