Plastic Container Reinforcing Profile for Stacking Stability
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Solution Overview
Problem
Containers for sensitive goods face instability due to bulging upper edges when stacked, and existing solutions either lack mechanical stability or result in thick, inefficient designs with limited mechanical and thermal load capacity.
Innovation Solution
The solution involves reinforcing the upper edge region of container side walls with profiles that can be attached in a positive or non-positive manner, allowing for independent material selection and providing a slideway for easy stacking, while maintaining flexibility to protect goods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the side walls are made flexible to avoid pressure points on goods, then the goods are protected, but the upper edge of the side walls bulges under load, making the stack unstable
Solution Approach 1:
The side wall is divided into two distinct parts: a flexible lower portion that contacts and protects the goods, and a rigid upper edge portion (stacking surface) that provides structural support. This segmentation allows each part to fulfill its specific function without compromising the other.
Solution Approach 2:
Different regions of the side wall are given different mechanical properties: the lower region maintains flexibility to protect goods from pressure points, while the upper edge region is reinforced with higher rigidity to prevent bulging and ensure stacking stability. This local differentiation of material properties resolves the contradiction between flexibility and stability.
2Strength
If foam load carriers are used with thick walls to increase load capacity, then mechanical stability is improved, but the usable volume relative to external dimensions decreases
Solution Approach 1:
Instead of uniformly thickening the entire side wall, the reinforcement is applied locally only to the upper edge region where stacking loads are concentrated. This allows the majority of the container volume to remain maximized while providing sufficient strength at the critical load-bearing area.
Solution Approach 2:
The side wall structure is segmented into a thin-walled flexible portion for maximum volume utilization and a localized reinforced upper edge for adequate load capacity, avoiding the need for uniformly thick walls throughout.
3Stability of the object's composition
If reinforcing ribs are molded onto the side wall to stabilize the upper edge, then the sealing area is strengthened, but the reinforcing effect is small when the side wall material is flexible
Solution Approach 1:
The side wall is constructed as a composite structure combining a flexible base material with a rigid reinforcing element (such as a thermoplastic profile or foam insert) at the upper edge. This composite construction provides significant reinforcing effect by integrating materials with complementary mechanical properties rather than relying solely on ribs of the same flexible material.
Data Source
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AI summary
The invention relates to containers (1) made of plastic, with a rectangular base (2) and four side walls (3, 4), wherein the base (2) has a first stacking contour (20) on its underside outer edge, wherein the side walls (3, 4) have a second stacking contour (30, 40) on their upper edge area, and wherein, when containers (1) are stacked on top of each other, the first stacking contour (20) of an upper container (1) and the second stacking contour (30, 40) of a lower container (1) engage with each other in a centering manner.According to the invention, the upper edge region of at least two opposing side walls (3, 4) is reinforced by at least one reinforcing profile (5) attached to the remaining side wall (3, 4) in a form-fit or force-fit manner, and, according to a first solution, each reinforcing profile (5) has at least one profile web (50) extending in the longitudinal direction of the reinforcing profile (5) on its upper side facing away from the container (1), forming a sliding surface (11) for a further container (1) to be placed on top, or, according to a second solution, each reinforcing profile (5) is arranged offset relative to the stacking contour (30, 40) in the direction of the bottom (2).