Refrigerator Shelf Hydrophobic Pattern for Spill Containment
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Solution Overview
Problem
Existing shelving designs for refrigerators and other surfaces fail to effectively prevent liquids from flowing over the rim of a shelf panel, leading to spills onto other surfaces or into the appliance.
Innovation Solution
A shelf assembly with a hydrophobic surface arranged in a spill containment pattern on the top surface, where the majority of the surface is non-hydrophobic and bounded by hydrophobic areas, repelling liquids and containing them within the non-hydrophobic regions without the need for physical barriers or encapsulation materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If physical barriers or encapsulation materials are used to contain spills, then spill containment reliability is improved, but device complexity and material usage increase
Solution Approach 1:
The patent replaces mechanical physical barriers (molded rims, plastic encapsulation) with a chemical surface property (hydrophobic coating) to achieve spill containment. The hydrophobic surface creates surface tension forces that prevent liquid from crossing the boundary, eliminating the need for complex mechanical containment structures while maintaining reliability
Solution Approach 2:
The patent changes the surface energy parameter of the shelf material by applying a hydrophobic coating. This parameter change creates a surface that repels water, allowing spill containment through surface tension rather than physical barriers. The contact angle between liquid and surface is increased to greater than 90 degrees, fundamentally altering the interaction between liquid and shelf surface
2Reliability
If physical barriers or molded rims are added to contain spills, then spill containment capability is improved, but manufacturing complexity increases
Solution Approach 1:
The patent replaces complex molded mechanical structures with a simple surface coating process. Instead of requiring multi-step molding operations to create rims and encapsulation features, the solution applies a hydrophobic coating to the existing shelf surface, significantly simplifying the manufacturing process while achieving the same spill containment function
Solution Approach 2:
The patent extracts the essential spill containment function from complex mechanical structures and implements it through a separate surface treatment layer. This allows the base shelf to be manufactured independently using standard processes, and the hydrophobic property to be added through a simpler coating operation
3Reliability
If plastic encapsulation and sealants are used for spill containment, then liquid retention is improved, but material usage and cost increase
Solution Approach 1:
The patent replaces material-intensive plastic encapsulation and sealant applications with a thin hydrophobic coating layer. The coating creates surface tension forces that retain liquid without requiring thick material layers or additional encapsulation materials, significantly reducing overall material consumption while maintaining liquid retention capability
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The hydrophobic spill containment pattern effectively retains liquids, maximizing usable shelf space and reducing material usage, while maintaining spill containment capabilities comparable to traditional designs without the need for plastic encapsulation, sealants, or physical barriers.
Implementation Method 1
a hydrophobic surface arranged in a spill containment pattern on the top surface of the shelf panel
Implementation Method 2
The hydrophobic surface... repelling liquids and containing them within the non-hydrophobic regions
Data Source
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AI summary
The specification discloses a method for containing spills on shelving and the like, and the resulting support members made in accordance with the method, by providing the generally flat top surface of a support with a hydrophobic surface which is arranged in a spill containment pattern and which is generally in the plane of the top surface of the support. The majority of the top surface of the support consists of one or more spill containment areas which are of a non-hydrophobic nature and which are bounded by the hydrophobic surfaces, such that spills on the shelving collect in the non-hydrophobic spill containment area or areas and are prevented from spreading by the hydrophobic surfaces.