Refrigerated Display Light Filtering for UV-Safe Food Visibility
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Solution Overview
Problem
Refrigerated food display cases expose perishable products to harmful light spectra, leading to reduced shelf life, discoloration, and bacterial growth due to UV and infrared radiation from ambient and artificial lighting, which negatively impacts food safety and appearance.
Innovation Solution
A refrigerated display case with a transparent polymeric filter that blocks or significantly reduces UV and infrared radiation, allowing only specific light ranges (red or blue) to pass through, thereby protecting perishable foods from harmful light while maintaining visibility of the products.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If transparent viewing panels are used to display perishable food articles, then product visibility is improved, but harmful light (UV and infrared radiation) penetrates the panels and accelerates food deterioration
Solution Approach 1:
A light filter is introduced as an intermediary component between the viewing panel and the perishable food articles. The filter selectively blocks harmful UV and infrared radiation while allowing visible light to pass through, thus maintaining product visibility while protecting food from light-induced deterioration
Solution Approach 2:
The light filter utilizes optical properties to selectively transmit or block specific wavelengths of light. By filtering out harmful ultraviolet and infrared spectra while permitting visible light passage, the system changes the spectral composition of light reaching the food, thereby preserving visibility while eliminating damaging radiation
2Illumination intensity
If bright artificial lighting is used to attract shoppers and improve sales, then illumination intensity is improved, but light exposure accelerates photochemical processes causing discoloration, oxidation, and bacterial growth
Solution Approach 1:
A light filter is positioned within the display case to act as a mediator between artificial lighting sources and perishable food articles. The filter blocks harmful UV and infrared radiation from both ambient and artificial lighting while permitting beneficial visible light to illuminate and display the food products
Solution Approach 2:
The system modifies the spectral parameters of light reaching the food by selectively filtering out harmful wavelength ranges (UV and infrared) while maintaining or enhancing visible light intensity. This parameter change allows bright illumination for visibility while eliminating radiation that causes photochemical deterioration
3Loss of information
If clear viewing panels are used to showcase food appearance, then transparency is improved, but harmful light spectra pass through and cause surface drying and internal heating
Solution Approach 1:
A light filter serves as an intermediary layer between clear viewing panels and perishable food articles. The filter blocks infrared radiation that causes surface drying and internal heating while allowing visible light to pass through for product visibility, thus protecting food from thermal and moisture loss damage
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 solution extends the shelf life of perishable foods, reduces shrinkage, and enhances their appearance by minimizing the negative effects of UV and infrared radiation, thereby promoting sales and reducing waste.
Implementation Method 1
A refrigerated display case with a transparent polymeric filter that blocks or significantly reduces UV and infrared radiation
Implementation Method 2
A refrigerated display case with a transparent polymeric filter that blocks or significantly reduces UV and infrared radiation
Data Source
AI summary
A refrigerated display merchandiser in which is stored food products and which is ordinarily exposed to prevailing ambient light is provided with transparent sheets which function as filter media to prevent harmful light from reaching the foods stuffs. The filtering media comprises a transparent sheet affixed to the display merchandiser as well as about any fluorescent lighting disposed within the merchandiser. The transparent sheet is either clear (untinted), or tinted, and passes either red or blue light or alternatively, absorbs ultraviolet light including both UV-A light and UV-B light.