Transparent UV-Filtering Coating for Thin Glass Packaging
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Solution Overview
Problem
Existing UV stabilizers are inadequate for protecting aldehydes in food products and fragrances from degradation by UV light in the 300-340 nm range, and glass containers are insufficient due to reduced thickness, necessitating a more effective UV filtering solution.
Innovation Solution
A filtering film comprising semi-conductive nanoparticles and organic UV compounds with specific absorbance characteristics, designed to absorb UV light in the 300-380 nm range, with a weighted mean absorbance greater than 2, effectively blocking 99% of UV photons in the 300-340 nm range while maintaining transparency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If glass thickness is reduced to limit packaging weight, then weight is reduced, but UV light absorption capability deteriorates
Solution Approach 1:
The patent applies composite materials by combining multiple UV-absorbing compounds (benzotriazole derivatives, benzophenone derivatives, triazine derivatives) with different absorption characteristics to create a filtering film that achieves superior UV protection compared to single materials. This composite approach allows the thin film to absorb UV light effectively without requiring increased thickness
Solution Approach 2:
The patent uses a thin filtering film (coating) applied to the glass container surface to provide UV protection. This thin film structure maintains the lightweight advantage of thin glass while adding UV filtering capability through a separate, optimized coating layer containing multiple absorbing compounds
2Reliability
If conventional UV stabilizers are used to protect aldehydes, then some UV protection is achieved, but protection against 300-340 nm UV light is insufficient
Solution Approach 1:
The patent optimizes the absorption parameters of the filtering film by selecting compounds and ratios that specifically target the 300-340 nm wavelength range where aldehydes are most vulnerable. The weighted mean absorbance is engineered to be greater than 2 in this specific range, providing targeted protection where it is most needed
Solution Approach 2:
The patent combines multiple classes of UV-absorbing compounds (benzotriazoles, benzophenones, triazines) with complementary absorption spectra to achieve comprehensive coverage of the 300-340 nm range, addressing the specific vulnerability of aldehydes to this wavelength range that single stabilizers cannot adequately protect against
3Object-affected harmful factors
If filtering film with high UV absorbance is applied, then UV protection is improved, but coloration of the film increases
Solution Approach 1:
The patent achieves selective absorption by designing the filtering film to absorb specifically in the 300-340 nm UV range while maintaining transparency in the visible range. This local quality approach allows the film to provide targeted UV protection without causing unwanted coloration, as different compounds are selected for their specific absorption characteristics in different wavelength ranges
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 filtering film effectively prevents UV-induced degradation of aldehydes in food and fragrances and allows for thinner, transparent glass containers by absorbing 99% of UV photons in the 300-340 nm range without significant coloration.
Implementation Method 1
compounds absorbing UV-light in a range from 300 nm to 380 nm... the weighted mean absorbance A380 of the filtering film is greater than 2... absorbing 99% of UV photons in the 300-340 nm range
Implementation Method 2
Acetaldehyde shear a common feature in terms of UV light interaction: they can absorb a UV photon to promote an electron from n state of the oxygen of carbonyl bound into a non-bounding π* state of the carbonyl bound, thus lowering carbonyl bound energy
Data Source
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AI summary
The present invention relates to a filtering film comprising compounds absorbing UV-light in a range from 300 nm to 380 nm and a binder, wherein the weighted mean absorbance A380 is greater than 2.