3D Fiber Molded Body Edge Structure for Easy Unstacking
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Solution Overview
Problem
Molded parts made of fibrous materials face difficulties in being stacked and unstacked easily without causing damage due to strong adhesion and friction between the fibers, leading to increased force requirements and potential damage during handling.
Innovation Solution
A three-dimensional molded body design featuring a circumferential side wall with a stacking shoulder and undercut, along with a degressive profile, reduces contact areas between stacked parts by limiting contact to specific regions, thereby minimizing adhesive and frictional effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If molded parts made of fibrous material are stacked with large contact surface area, then stability during transport is improved, but the force required for unstacking increases and damage occurs
Solution Approach 1:
The edge region is segmented into multiple functional zones: a stacking shoulder portion for stable contact, and an undercut portion that creates a mechanical interlock. This segmentation allows the contact area to be divided into a stable bearing surface and a locking feature, reducing the force needed to separate stacked parts while maintaining transport stability.
Solution Approach 2:
The solution transitions from a two-dimensional contact surface problem to a three-dimensional geometric feature by introducing an undercut. The undercut creates a vertical dimension component that provides mechanical interlocking, transforming the stacking interface from a simple flat contact to a geometric engagement that reduces separation force requirements.
2Ease of operation
If molded parts are designed with identical geometry for uniform stacking, then stacking alignment is improved, but adhesive and frictional effects between fibers increase
Solution Approach 1:
Instead of making the entire edge region uniform, the solution applies local quality differentiation by creating a stacking shoulder with a specific geometry that provides alignment, while simultaneously introducing an undercut feature that reduces fiber-to-fiber contact area. This localized geometric variation maintains alignment benefits while minimizing adhesive and frictional effects.
3Force
If contact area between stacked molded parts is reduced, then unstacking force is decreased, but stacking stability is compromised
Solution Approach 1:
The contact interface is segmented into two functional portions: the stacking shoulder provides a sufficient contact area for stability during transport, while the undercut portion minimizes the actual fiber-to-fiber adhesive contact area. This segmentation allows the system to achieve both stability and easy unstacking simultaneously.
Solution Approach 2:
The stacking shoulder acts as an intermediary element that provides a controlled contact interface. It mediates between the need for stability (by providing a bearing surface) and the need for easy unstacking (by limiting the adhesive contact area through its specific geometry and the associated undercut feature).
Data Source
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AI summary
A three-dimensional shaped body (10) made of fibrous material and a method for producing a three-dimensional shaped body (10) made of fibrous material are described, wherein the shaped body (10) has a circumferential side wall (14) surrounding an interior of the shaped body (10) and an edge region (16), wherein a stacking shoulder (30) is formed in a transition (24) from the side wall (14) to the edge region (16) and the edge region (16) has an undercut (18).