Pulp-Molded Packing Case Buffer Structure for Impact Load Distribution
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Solution Overview
Problem
Existing buffer materials for packing cases do not effectively distribute impact loads and may be prone to crushing, especially when packing large or heavy objects, leading to inadequate protection.
Innovation Solution
A packing case unit comprising a cardboard case main body and a buffer material formed through pulp molding, featuring a first planar portion and a double-buffer structure with cylindrical and flange portions, secured using a simple fixing mechanism with mounting holes, covering portions, and fitting pieces to ensure stable attachment and distribution of impact loads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a single buffer material structure is used, then the structure is simple, but the impact resistance is insufficient for large or heavy objects
Solution Approach 1:
The buffer material is divided into multiple projections (first projection, second projection, third projection, fourth projection) arranged around the buffer material mounting hole. Each projection independently absorbs impact forces from different directions, providing comprehensive protection against multi-directional impacts while maintaining a relatively simple overall structure.
Solution Approach 2:
Multiple buffer projections are integrated into a single buffer material component that is mounted within one packing case. The projections work together to provide combined protection, merging the functionality of multiple separate buffers into one unified structure that resists impacts from various directions simultaneously.
2Strength
If buffer material projections have convexly curved semispherical tips, then buffering effect against single impact is good, but crushing resistance under distributed load is insufficient
Solution Approach 1:
Different portions of the buffer material projections have different geometries optimized for their specific functions: the tip portions maintain convexly curved semispherical shapes for effective single-impact buffering, while the root portions feature increased thickness to provide crushing resistance under distributed loads. This local differentiation of properties allows each region to excel at its intended function.
3Reliability
If buffer material is firmly fixed to case main body, then protection stability is improved, but adaptability to different packed objects is reduced
Solution Approach 1:
The buffer material projections are designed with inherent flexibility, allowing them to dynamically adjust their deformation characteristics based on the impact force and direction. The projections can elastically deform to absorb impacts while maintaining their structural connection to the case, providing both stable fixation and adaptive response to varying packing conditions.
Data Source
AI summary
A packing case unit including a case main body and a first buffer material. The first buffer material is formed of a pulp-molding material. The case main body includes a first buffer material mounting hole, a first covering portion, and a first fitting hole. To the first buffer material mounting hole, the first buffer material is inserted. The first covering portion includes a first main covering portion and a first fitting piece. The first main covering portion covers the first buffer material, by being folded. In the first fitting hole, the first fitting piece is fitted by being folded.