3D Fiber Molded Body Stacking Shoulder for Low-Force Separation
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Solution Overview
Problem
Fiber-containing materials are difficult to stack and unstack due to strong adhesion and friction, often resulting in damage during the unstacking process.
Innovation Solution
A three-dimensional molded body design featuring a circumferential side wall with a stacking shoulder and undercut in the edge region, along with a degressive profile, reduces contact surfaces and friction, facilitating easy stacking and unstacking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of stationary object
If molded parts made of fiber-containing material are stacked to reduce transport space, then storage efficiency is improved, but the molded parts adhere strongly to each other and require great force to unstack
Solution Approach 1:
The contact surface between stacked molded parts is segmented into multiple smaller contact points through the stacking shoulder design, rather than having a continuous large-area contact. This segmentation reduces the total adhesion force while maintaining stable stacking.
Solution Approach 2:
Instead of designing the molded parts with smooth, flat contact surfaces that maximize adhesion, the invention inverts the approach by creating an undercut geometry that intentionally reduces the contact area. The stacking shoulder creates a geometry where the upper part rests on a smaller surface area of the lower part, reversing the conventional design philosophy.
2Volume of stationary object
If molded parts made of fiber-containing material are stacked, then storage efficiency is improved, but the molded parts are damaged during unstacking
Solution Approach 1:
The invention inverts the conventional stacking design by creating an undercut geometry that reduces contact area. This inversion prevents the high contact pressures and friction forces that cause damage during unstacking, while still allowing stable stacking through the stacking shoulder design.
Solution Approach 2:
The stacking shoulder creates a localized contact region with specific geometric properties (undercut geometry) that differ from the rest of the molded part surface. This local quality change concentrates the stacking function in a specific area optimized for easy separation, while other areas maintain their original properties.
3Manufacturing precision
If molded parts made of fiber-containing material have identical designs for uniformity, then manufacturing consistency is improved, but the contact area between stacked parts is large
Solution Approach 1:
The stacking shoulder design introduces a localized geometric feature (undercut) that specifically addresses the contact area issue without changing the overall uniformity of the molded parts. The local quality change is confined to the stacking region, while the rest of the part maintains its consistent, identical design across all production units.
Data Source
AI summary
A three-dimensional molded body of fiber-containing material and a method for producing a three-dimensional molded body of fiber-containing material are described. The molded body has a circumferential side wall, which surrounds an interior of the molded body, and an edge region. A stacking shoulder is formed in a transition from the side wall to the edge region, and the edge region has an undercut.