Polymeric Packaging Material Oxygen Barrier and Light Blocking
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Solution Overview
Problem
Current plastic packaging materials, such as PET, lack sufficient oxygen barrier properties and are not suitable for storing oxygen-sensitive and light-sensitive products, as they allow gas permeability and light transmission, leading to reduced shelf life and product degradation.
Innovation Solution
A polymeric material comprising a polyester, mineral particles, a polyamide, and a transition metal catalyst, which provides both oxygen barrier properties and low light transmission characteristics, suitable for use in injection stretch blow molding technologies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If PET is used for making transparent packaging articles, then good mechanical properties and thermal performances are achieved, but oxygen barrier properties are insufficient and light transmission occurs
Solution Approach 1:
The patent uses a composite material system consisting of PET matrix combined with polyamide barrier layer and silica particles. This composite structure combines the mechanical strength of PET with the oxygen barrier properties of polyamide and the light-blocking characteristics of silica, resolving the contradiction between transparency/mechanical strength and oxygen barrier performance.
Solution Approach 2:
The packaging article is divided into functional layers: an outer PET layer providing mechanical strength and a inner barrier layer containing polyamide and silica particles providing oxygen barrier and light blocking functions. This segmentation allows each layer to optimize its specific function without compromising others.
2Illumination intensity
If high amount of opacifying agents such as TiO2 is used, then opacity is improved, but cost increases extremely
Solution Approach 1:
The patent replaces expensive TiO2 opacifying agents with cheaper silica particles that provide sufficient light blocking and opacity effects. The silica particles are less costly and achieve the desired optical properties without the extreme cost increase associated with high amounts of TiO2.
Solution Approach 2:
The patent changes the type of opacifying agent from TiO2 to silica particles, altering the material parameter to achieve cost-effectiveness while maintaining the required opacity and light blocking properties for protecting light-sensitive products.
3Illumination intensity
If multilayered packaging articles with black layer are used, then opacity to UV and visible light is improved, but cost increases compared to monolayer solution
Solution Approach 1:
The patent merges multiple functions into a single monolayer structure: the outer PET layer provides mechanical strength while the embedded polyamide barrier layer and silica particles collectively provide oxygen barrier, light blocking, and opacity functions. This consolidation eliminates the need for separate black layers while maintaining comprehensive protection and reducing cost.
Solution Approach 2:
The invention uses a composite monolayer structure combining PET, polyamide, and silica particles to achieve the functionality of multilayered structures with black layers, providing cost-effectiveness while maintaining superior opacity and light blocking properties.
4Illumination intensity
If micrometrical silica particles are dispersed in polyester resin, then light transmission properties are improved, but gas barrier properties are insufficient
Solution Approach 1:
The patent creates a composite system where silica particles dispersed in PET are combined with polyamide barrier layer. This composite structure maintains the light blocking benefits of silica while the polyamide component provides the necessary gas barrier properties that silica alone cannot achieve.
Solution Approach 2:
The barrier function is segmented between different components: silica particles handle light blocking and opacity, while the polyamide layer handles gas barrier functions. This functional segmentation allows each component to optimize its specific property without compromising the other.
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 material effectively extends the shelf life of packaged products by reducing oxygen permeability and light transmission, making it suitable for storing sensitive products while maintaining cost-effectiveness.
Implementation Method 1
a transition metal catalyst, which provides both oxygen barrier properties and low light transmission characteristics
Implementation Method 2
mineral particles... low light transmission characteristics
Implementation Method 3
low light transmission characteristics, suitable for storing sensitive products
Data Source
AI summary
The polymeric material having oxygen barrier properties and low light transmission characteristics, in particular within the UV and visible light wavelengths and comprises (A) a polyester, (B) mineral particles, (C) a polyamide, and (D) at least one transition metal catalyst. Preferably the amount of mineral particles is not more than 26 wt % of the total weight of the material, and is not less than 20 wt % of the total weight of the material.