Single-Layer PET Bottle with Al and TiO2 Fillers for Total Light Shielding
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Solution Overview
Problem
Conventional single-layer plastic containers with light shielding capabilities face challenges in achieving total light protection while maintaining a white color and reasonable weight, as high concentrations of light absorbers required for effective shielding result in undesirable darkening of the container surface, and existing solutions are either unviable or require complex multi-layer structures.
Innovation Solution
A single-layer plastic container comprising a thermoplastic matrix of polyethylene terephthalate (PET) and high impact polystyrene (HIPS) with titanium dioxide (TiO2) and metallic aluminium (Al) as light-shielding fillers, allowing for virtually total light shielding without darkening the container surface, achieved through a concentrated additive that enhances the structural and light-shielding properties of PET.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high concentrations of light absorbers are used to achieve effective light shielding, then light protection is improved, but the container surface becomes darkened and unattractive
Solution Approach 1:
The patent changes the fundamental parameter of light interaction by replacing light absorbers with light reflectors (metallic aluminium particles). This parameter change allows the container to achieve high light shielding (99.9%) while maintaining high surface brightness (L* > 86) because the aluminium particles reflect light rather than absorb it, eliminating the darkening effect associated with conventional light absorbers.
Solution Approach 2:
The patent creates a composite material system combining PET matrix with metallic aluminium particles and titanium dioxide. This composite structure provides both structural integrity and superior light shielding while maintaining whiteness. The combination of aluminium (for reflection-based shielding) and TiO2 (for whitening and additional shielding) achieves the dual goal of total light protection and white appearance.
2Reliability
If multi-layer structures are used to achieve total light shielding, then light protection is improved, but device complexity and production cost increase
Solution Approach 1:
The patent merges the light shielding function and the white appearance function into a single layer structure. By incorporating metallic aluminium particles and titanium dioxide directly into the PET matrix, the invention achieves total light shielding (99.9%) and white color (L* > 86) in one layer, eliminating the need for complex multi-layer constructions while maintaining both protective and aesthetic functions.
Solution Approach 2:
The single-layer PET container with aluminium and TiO2 fillers performs multiple functions simultaneously: it provides structural containment, achieves total light shielding, and maintains white appearance. This multi-functional design replaces what would traditionally require separate layers for shielding and appearance, simplifying the overall structure while enhancing performance.
3Reliability
If high concentrations of light absorbers are used to achieve total shielding, then light protection is improved, but the container weight increases
Solution Approach 1:
The patent changes the mechanism from light absorption to light reflection by using metallic aluminium particles. This parameter change enables total light shielding with significantly lower filler loading (5-15% by weight) compared to conventional absorbers, thereby reducing container weight while maintaining 99.9% light protection levels.
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 enables the production of extremely light single-layer containers with virtually total light shielding (99.9%) while maintaining a conventionally white color, using conventional equipment and processes, and allows for high filler content without adverse effects on the container's appearance or weight.
Implementation Method 1
Al has been used since its shielding efficacy is based on the reflecting effect and not on light absorption; this means that the container surface does not 'swallow' the light but rather that it reflects it
Implementation Method 2
a concentrated additive (hereafter additive) which contains the fillers and an amorphous plastic other than PET in which the fillers are previously dispersed
Data Source
Figure 1
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AI summary
Single-layer plastic container with inorganic light-shielding fillers, that afford a very high light shield, even a virtually total shield in the whole light spectrum, with a very light weight container. The plastic structure of the container contains at least two thermoplastic polymers of a different nature that complement each other in their function of structurally constituting the container, and the light-shielding inorganic fillers contain at least two inorganic substances of a different nature that complement each other in their light-shielding function. Due to the particular constitution of the plastic structure and the efficient combination of inorganic shielding fillers, it is possible to achieve modular light shields, even virtually total shields, in very light single-layer containers without having to resort to the complex and costly multi-layer structures that are usual when shielding levels close to absolute are sought, and all of this using conventional equipment and production processes.