PET Preform Light Barrier via Polymeric Additives
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Solution Overview
Problem
Current packaging solutions for light-sensitive products like UHT milk lack effective light barriers, leading to photo-oxidation and degradation, especially since existing PET containers do not provide comprehensive protection against visible and ultraviolet light, and often require high concentrations of additives or pigments that increase costs and complexity.
Innovation Solution
A preform made from polyethylene terephthalate (PET) with added polymeric additives like polypropylene, which creates an opaque and reflective surface, providing a significant light barrier without the need for coloring additives, allowing for the production of lightweight, cost-effective containers with enhanced processing properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If high concentrations of additives or pigments are used to create light barrier properties, then light protection is improved, but material costs and processing complexity increase
Solution Approach 1:
The patent changes the concentration parameter of additives from high (prior art) to low (0.1-10% by weight), achieving the same light barrier effect through optimized formulation. This resolves the contradiction by demonstrating that high concentrations are not necessary when the right additive selection and combination are used
Solution Approach 2:
The patent creates a composite material system combining PET base polymer with specific additives (titanium dioxide, zinc oxide, silicates, clays) in optimized ratios. This composite approach provides superior light barrier properties at lower overall additive concentrations compared to using pigments alone, thereby reducing processing complexity while maintaining protection
2Object-affected harmful factors
If high concentrations of additives or pigments are used to create light barrier properties, then light protection is improved, but material costs increase
Solution Approach 1:
The patent optimizes the concentration parameter of light barrier additives to 0.1-10% by weight, significantly lower than prior art formulations. This parameter change reduces material costs while achieving equivalent or superior light protection through the synergistic effect of multiple additive types
Solution Approach 2:
The patent employs inexpensive inorganic additives (titanium dioxide, zinc oxide, silicates, clays) that can be used at low concentrations to achieve the desired light barrier effect, replacing more expensive organic pigments and dyes while reducing overall formulation cost
3Illumination intensity
If PET containers are made transparent to maximize visibility, then aesthetic appeal is improved, but light barrier properties deteriorate
Solution Approach 1:
The patent applies local quality by incorporating light barrier additives specifically in the container wall structure where light exposure occurs, while maintaining the overall container transparency or opacity based on specific application requirements. The additives are concentrated in the wall material rather than uniformly distributed throughout the entire container
Solution Approach 2:
The patent uses partial action by applying low concentrations (0.1-10%) of light barrier additives, which is sufficient to achieve the desired light protection without completely obscuring the container contents. This partial addition maintains aesthetic appeal while providing adequate light barrier properties
4Object-affected harmful factors
If multilayer carton packs with full light barrier are used to protect milk, then light protection is improved, but oxygen barrier properties deteriorate after opening
Solution Approach 1:
The patent creates a universal light barrier solution using inorganic additives (titanium dioxide, zinc oxide, silicates, clays) that simultaneously provide both light protection and oxygen barrier properties. These additives serve multiple functions: blocking light across UV-visible spectrum and creating physical barriers to oxygen permeation, eliminating the need for separate multilayer structures
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 effectively protects light-sensitive products from photo-oxidation by reflecting and absorbing light, maintaining product quality over long periods without special storage conditions, while reducing material costs and improving processing ease, resulting in containers that are both lightweight and efficient.
Implementation Method 1
creating an opaque and reflective surface, providing a significant light barrier
Implementation Method 2
reflecting and absorbing light
Implementation Method 3
protects light-sensitive products from photo-oxidation
Data Source
Figure 1~2
Figure 3~4
Figure 5
AI summary
Preform, serving as a semi-finished product, for a container intended for containing products therein that are sensitive to radiation in particular light sensitive and food and dairy products, consisting of at least one base layer (1) made of a primary plastic base material, with a certain amount of additives (5) incorporated in it (1 ), characterised in that said preform (10, 20) is opaque over virtually the whole extent thereof, wherein a relatively low percentage of plastic additives (5) is incorporated to generate sard opaque appearance (22), so as to protect the inner space (9) thereof which is delimitated by it against external radiation (V1, V2) particularly electromagnetic radiation, more particularly light, under normal pressure condition.