Leakproof Corrugated Box Corner Structure
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Solution Overview
Problem
Existing liquid-tight and leakproof packaging boxes, particularly those made from corrugated board, face challenges with structural rigidity, stacking strength, and environmental sustainability, as they often lack sufficient locking mechanisms and are not recyclable, leading to issues with bulging and reduced load-bearing capacity when stacked.
Innovation Solution
A one-piece packaging box design using double- or triple-layered corrugated board with plastic-coated linerboard or laminated plastic film, featuring large glueing flaps and a double-folded beam structure that creates a torsionally rigid and leakproof corner, eliminating the need for separate stacking planes and allowing for the addition of stacking claws and handles, ensuring stability and ease of handling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If liquid-tight corners with integrated lid flaps are used in corrugated board packaging, then leakproof performance is improved, but structural rigidity deteriorates causing corner bulging under heavy loads
Solution Approach 1:
The corner structure is divided into separate functional elements: the liquid-tight corner sealing mechanism is segmented from the load-bearing frame structure. This allows the corner to provide leakproof sealing without compromising the overall structural rigidity of the box frame, preventing corner bulging under heavy loads while maintaining liquid-tight integrity.
Solution Approach 2:
An intermediary reinforcement element is introduced between the liquid-tight corner structure and the box frame. This intermediary component acts as a mediator that transfers loads away from the corner sealing structure, preventing stress concentration that would cause corner bulging, while allowing the corner to maintain its leakproof function.
2Reliability
If corrugated board with slippery PET coating is used, then liquid-tight performance is improved, but locking capability deteriorates due to insufficient friction
Solution Approach 1:
Different surface qualities are applied to different parts of the corrugated board: slippery PET coating is used in areas requiring liquid-tight performance, while areas requiring locking capability feature increased surface roughness or friction-enhancing treatments. This local differentiation allows each region to optimize its function without compromising the other.
Solution Approach 2:
The packaging structure uses composite construction combining corrugated board with PET coating and additional friction-enhancing elements or surface treatments. This composite approach allows the smooth PET-coated surfaces to provide liquid-tight sealing while integrated friction-enhancing features provide adequate locking capability without compromising either function.
3Strength
If heavy box weights are used to meet load requirements, then load-bearing capability is improved, but stacking stability deteriorates due to corner loosening
Solution Approach 1:
The corner structure incorporates preliminary locking features and reinforcement elements that are pre-configured to prevent loosening before stacking occurs. These preliminary actions ensure that the corner structure maintains its integrity and locking capability even when heavy loads are applied, preventing the corner loosening that would compromise stacking stability.
Solution Approach 2:
The design incorporates built-in stress distribution features and reinforcement elements that cushion and distribute loads before they can cause corner loosening. This beforehand cushioning protects the corner structure from the destabilizing effects of heavy weights, maintaining stacking stability while meeting load-bearing requirements.
Data Source
AI summary
A leakproof and liquid-tight packaging box of corrugated board, which box is erected mechanically using glueing as an aid. What is essential in the invention is that the corner surfaces of the structurally strong, torsionally rigid, leakproof and liquid-tight packaging box stackable one on top of another are folded and glued to the outer surface of the vertical surface of the short side. In addition, it comprises an inward-formed cone structure of the vertical surface of the long side of the box, and a rigid and load-resistant beam structure is formed on all sides of the packaging box.