PET Container Light Shielding with Low Filler
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Solution Overview
Problem
Current multi-layer containers with light shielding face challenges such as high filler content, complex manufacturing processes, and compatibility issues between layers, leading to delamination and increased costs, while single-layer solutions require excessive fillers for effective light protection.
Innovation Solution
A multi-layer container composed of polyethylene terephthalate (PET) with aluminium metal and a light absorbent dispersed in the thermoplastic matrix, where the filler content is minimized to ensure compatibility and reduce the amount of shielding materials needed, achieving high light shielding capacity across the UV-VIS spectrum with lower filler levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If multi-layer containers with high filler content are used for light shielding, then light protection capacity is improved, but manufacturing complexity and cost increase
Solution Approach 1:
The patent changes the chemical composition parameters of the PET material by incorporating specific light-absorbing additives and pigments that provide effective light shielding at much lower concentrations (0.1-5% by weight) compared to traditional mineral fillers. This parameter change in material composition allows achieving the same light protection effect with reduced filler content, thereby simplifying the multi-layer structure and reducing manufacturing complexity.
Solution Approach 2:
The patent creates a composite material system by combining PET base polymer with light-absorbing additives, pigments, and optional mineral fillers in optimized ratios. This composite approach allows the material to inherently provide light shielding properties when incorporated into single-layer containers, eliminating the need for complex multi-layer constructions and reducing overall manufacturing complexity while maintaining effective light protection.
2Object-affected harmful factors
If multi-layer containers with high filler content are used for light shielding, then light protection capacity is improved, but production costs increase
Solution Approach 1:
The patent optimizes the concentration parameters of light-absorbing additives to achieve maximum light shielding efficiency at minimal dosages (0.1-5% by weight). This parameter optimization reduces the quantity of expensive filler materials required, directly lowering raw material costs while maintaining effective light protection capacity in single-layer containers.
Solution Approach 2:
The patent extracts and eliminates the need for complex multi-layer structures with high filler content by incorporating light-absorbing properties directly into the base PET material through additive technology. This extraction of the light shielding function from a multi-layer system and integration into a single-layer material reduces both material costs and processing costs associated with manufacturing complex multi-layer containers.
3Object-affected harmful factors
If high filler content is used in PET layers, then light shielding is improved, but compatibility between layers deteriorates causing delamination
Solution Approach 1:
The patent changes the filler content parameter to optimized low levels (0.1-5% by weight of light-absorbing additives) that do not interfere with the polymerization process or layer adhesion. This parameter reduction eliminates the compatibility issues and delamination problems caused by high filler content in traditional multi-layer containers, while still achieving effective light shielding through the enhanced light-absorbing properties of the additives.
Solution Approach 2:
The patent develops a composite PET material system where light-absorbing additives are uniformly distributed and chemically compatible with the polymer matrix, creating a homogeneous single-layer structure. This composite approach eliminates inter-layer compatibility issues and delamination problems inherent in multi-layer constructions, as there are no interfaces between layers with different filler contents to cause adhesion failures.
4Object-affected harmful factors
If single-layer containers with excessive fillers are used for light protection, then light shielding is improved, but mechanical properties deteriorate
Solution Approach 1:
The patent optimizes the filler concentration parameter to a low range (0.1-5% by weight) that maintains the structural integrity and mechanical properties of the PET material. This optimized parameter level provides sufficient light shielding capacity without the excessive filler content that would compromise tensile strength, impact resistance, and other mechanical properties of single-layer containers.
Solution Approach 2:
The patent uses light-absorbing additives and pigments that provide light shielding functionality equivalent to high filler content multi-layer containers, but at much lower concentrations. This functional copying of the light protection effect with minimal filler content preserves the mechanical properties of the single-layer PET structure, avoiding the strength deterioration caused by excessive filler loading.
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 provides effective light shielding with significantly lower filler levels, simplifying the manufacturing process, reducing costs, and enhancing the mechanical properties of the container, while maintaining aesthetic personalization and sustainability.
Implementation Method 1
aluminium metal (Al) and a light absorbent dispersed in the thermoplastic matrix
Implementation Method 2
opacifying materials dispersed in any of the layers of thermoplastic material
Data Source
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AI summary
Opaque multi-layer container with light shielding, of the type produced by blowing a preform or by injection-blowing, preferably intended to contain photosensitive substances, which includes at least two layers of thermoplastic material with opacifying materials dispersed in the layers of the thermoplastic material, said thermoplastic material being polyethylene terephthalate (PET) in all of the layers and including, in at least one of the layers, aluminium metal (Al) and a light absorbent as opacifying material dispersed in the thermoplastic matrix. The invention that is presented provides the main advantage of being able to achieve practically total protection at any wavelength of the light spectrum, with much lower filler levels than those conventionally used to date.