Multilayer Plastic Container Oxygen Barrier Design
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Solution Overview
Problem
Existing multilayer plastic containers fail to effectively prevent oxygen from entering and existing within the container, leading to degradation of contents and flavor issues, while also facing challenges such as burnt deposits during molding and high production costs due to the use of transition metal salts.
Innovation Solution
A multilayer plastic container design featuring an oxygen-absorbing layer and an oxygen-blocking layer, where the oxygen-absorbing layer is positioned inside the oxygen-blocking layer, and both layers are composed of specific materials with minimal transition metal content, ensuring efficient oxygen absorption and prevention of oxygen entry without the need for transition metal salts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If transition metal salts are mixed into m-xylylene group-containing polyamide resin to improve gas barrier properties, then oxygen absorption capability is enhanced, but burnt deposits are generated during molding and yellowing occurs upon recycling
Solution Approach 1:
The patent extracts and removes transition metal salts from the polyamide resin composition. The invention achieves oxygen absorption capability without transition metal catalysts by using a different chemical approach - incorporating oxidizable groups directly into the polyamide resin structure itself, thereby eliminating the harmful side effects of burnt deposits and yellowing while maintaining gas barrier properties
Solution Approach 2:
The patent changes the chemical parameters of the polyamide resin by introducing oxidizable groups (such as vinyl groups, acetylenic groups, or allyl groups) into the resin structure. This parameter change allows the resin to absorb oxygen through oxidation of these groups without requiring transition metal catalysts, thus resolving the contradiction between oxygen absorption capability and production stability
2Reliability
If transition metal salts are mixed into polyamide resin to achieve oxygen-absorbing properties, then oxygen absorption is improved, but yellowing of thermoplastic polyester resin occurs upon recycling
Solution Approach 1:
The patent removes transition metal salts from the system and replaces them with an alternative oxygen absorption mechanism based on oxidizable functional groups incorporated into the polyamide resin structure. This extraction eliminates the source of yellowing while preserving oxygen absorption capability
Solution Approach 2:
The patent introduces oxidizable groups (vinyl, acetylenic, or allyl groups) as intermediary structures within the polyamide resin that can react with oxygen without requiring transition metal catalysts. These intermediary groups serve as the active sites for oxygen absorption while being chemically stable enough not to cause yellowing of adjacent polyester resin layers
3Reliability
If a five-layer bottle structure with oxygen-absorbing layer and gas barrier layer is used to prevent oxygen entry and absorption, then oxygen protection is improved, but production complexity and costs increase
Solution Approach 1:
The patent merges multiple functions into a single integrated layer. The polyamide resin layer simultaneously provides gas barrier properties (preventing oxygen permeation) and oxygen absorption capability (through oxidizable groups). This consolidation reduces the number of separate layers needed, simplifying the container structure and reducing production complexity while maintaining comprehensive oxygen protection
Solution Approach 2:
The patent creates a universal polyamide resin layer that performs multiple functions: it acts as a gas barrier to prevent oxygen permeation, serves as an oxygen absorber through its oxidizable groups, and provides structural integrity. This multi-functional layer eliminates the need for separate specialized layers, reducing overall system complexity
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 container effectively prevents oxygen-related degradation and flavor loss, reduces production costs by avoiding burnt deposits and yellowing, and maintains high gas barrier properties over time.
Implementation Method 1
oxygen is absorbed by catalytic oxidation of the m-xylylene group-containing polyamide resin
Implementation Method 2
a method of preventing oxygen from entering into a plastic container, which comprises producing a plastic container having a wall that has a multilayer structure, for example, by establishing a gas barrier layer consisting of a m-xylylene group-containing polyamide resin
Data Source
Figure 1~2
Figure 3
AI summary
The present invention provides a multilayer plastic container capable of effectively preventing the degradation of content and a reduction in flavor such as taste or aroma, which are caused by oxygen. The multilayer plastic container of the present invention is a multilayer plastic container having at least one oxygen-absorbing layer and at least one oxygen-blocking layer, wherein the oxygen-absorbing layer is a layer formed from a thermoplastic polyester resin composition comprising a thermoplastic polyester resin and an oxygen absorber, and the content of the oxygen absorber to the total mass of the thermoplastic polyester resin composition is 0.01% to 3% by mass, the oxygen-blocking layer is a layer formed from a polyamide resin composition comprising a polyamide resin, and the content of a transition metal selected from the group consisting of cobalt, copper, cerium, aluminum and manganese to the total mass of the polyamide resin composition is less than 10 ppm, and at least one of the oxygen-absorbing layers is arranged on a side more inside than the oxygen-blocking layer.