Multilayered Container Oxygen Barrier Resin Crystallization
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Solution Overview
Problem
The existing multilayered containers with oxygen barrier resin layers face issues such as tearing and uneven thickness during solid-phase forming, which affect their molding processability and mechanical properties.
Innovation Solution
A multilayered container design featuring an inner and outer olefin resin layer with an intermediate oxygen-absorbing barrier resin layer, where the cooling crystallization peak temperature of the barrier resin is lowered by adjusting the content of oxidizable polymers and oxidation catalysts, allowing solid-phase formation at a temperature range 1-15°C lower than the base resin's crystallization temperature, and maintaining excellent oxygen barrier properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If solid-phase forming is adopted to improve transparency and mechanical properties, then the mechanical properties are improved, but tearing and uneven thickness occur in the oxygen barrier resin layer
Solution Approach 1:
The invention changes the crystallization temperature parameter of the oxygen barrier resin layer by blending oxidizable polymer with the base resin. This temperature parameter adjustment allows the layer to remain amorphous during solid-phase forming, preventing tearing and thickness unevenness while maintaining mechanical strength and transparency
Solution Approach 2:
The invention creates a composite resin composition by blending oxidizable polymer (5-50 wt%) with oxygen barrier base resin. This composite structure modifies the thermal and mechanical properties, enabling the layer to withstand solid-phase forming without degradation
2Ease of manufacture
If the cooling crystallization peak temperature is lowered to prevent tearing, then molding processability is improved, but oxygen barrier properties may be compromised
Solution Approach 1:
The invention adjusts the crystallization temperature parameter of the oxygen barrier layer by controlling the oxidizable polymer content and its molecular weight. This allows the layer to maintain amorphous structure during molding while preserving oxygen barrier functionality
Solution Approach 2:
The oxidizable polymer acts as an intermediary component that modifies the thermal behavior of the oxygen barrier resin. It prevents crystallization during molding through steric hindrance and free volume effects, while the oxygen barrier properties are maintained through the base resin structure
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
This approach enhances the processability and mechanical properties of the multilayered container while maintaining its oxygen barrier capabilities, preventing frequent crystallization and ensuring a smooth molding process.
Implementation Method 1
an oxygen-absorbing barrier resin composition which comprises an oxidizable polymer and an oxidation catalyst
Implementation Method 2
a cooling crystallization peak temperature of the oxygen-absorbing barrier resin composition is lower than that of a base resin
Data Source
AI summary
Disclosed is a multilayered container having an intermediate layer comprising an oxygen-absorbable barrier resin composition showing excellent processability upon molding. Specifically disclosed is a multilayered container which comprises an inner layer and an outer layer each comprising an olefin resin and an intermediate layer provided between the inner layer and the outer layer and comprising an oxygen-absorbable barrier resin composition, wherein the oxygen-absorbable barrier resin composition has a cooling crystallization peak temperature lower than that of a base resin (an oxygen barrier resin) which constitutes the oxygen-absorbable barrier resin composition, the multilayered container is formed by a solid-phase-forming process at a temperature lower by 1 to 15° C. than the cooling crystallization starting temperature (Tc2) of the base resin, and the body of the container shows a calorific value of less than 0.5 J/g by the isothermal crystallization after heating from 30° C. to 130° C. at a heating rate of 100° C./min in a thermal analysis of the body.