Multilayer Bottle Oxygen Barrier via Scavenger Composite
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Solution Overview
Problem
Existing synthetic resin multilayer bottles face the challenge of oxygen from outside air entering the inner container body, leading to potential deterioration of contents like soy sauce or liquid seasonings, despite measures to prevent oxygen penetration.
Innovation Solution
The synthetic resin multilayer bottle incorporates a polyamide-based resin and an oxygen scavenger in the polyester resin forming the inner container body, with an oxygen barrier agent blended in the range of 3 to 10 percent by mass, to effectively prevent oxygen penetration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If outside air is introduced between the outer shell bottle and inner container body to restore the outer shell bottle's shape, then the outer shell bottle can restore its original shape, but oxygen from the outside air enters the inner container body causing content deterioration
Solution Approach 1:
The patent applies composite materials by creating a multilayer structure for the inner container body comprising a polyester resin layer and an oxygen barrier layer. This composite structure allows the container to maintain shape restoration functionality while blocking oxygen penetration. The oxygen barrier layer contains oxygen scavengers that actively consume any oxygen that attempts to penetrate through the container walls, effectively resolving the contradiction between shape restoration and oxygen prevention.
2Ease of manufacture
If polyethylene resin is used for the multilayer container, then the container can be manufactured, but transparency is poor making it difficult to see the content
Solution Approach 1:
The patent applies local quality by assigning different material properties to different layers of the inner container body. The polyester resin layer provides high transparency for content visibility, while the oxygen barrier layer (with potentially different optical properties) provides oxygen blocking functionality. This local differentiation of material qualities allows each layer to optimize its specific function while working together as a unified structure.
3Ease of manufacture
If polyethylene resin multilayer bottle is used, then the bottle can be manufactured and used, but oxygen barrier property is insufficient leading to content deterioration during long-term storage
Solution Approach 1:
The patent replaces the conventional polyethylene resin structure with a composite material system consisting of a polyester resin layer and an oxygen barrier layer. The oxygen barrier layer contains oxygen scavengers that actively consume penetrating oxygen, providing superior oxygen barrier properties for long-term storage reliability while maintaining manufacturability through established multilayer molding techniques.
4Reliability
If oxygen barrier property is enhanced to prevent oxygen penetration, then content deterioration is suppressed, but manufacturing complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the inner container body into distinct functional layers: a polyester resin layer for structural integrity and transparency, and an oxygen barrier layer for oxygen blocking. This segmentation of functions into separate layers simplifies the design and manufacturing process compared to attempting to achieve all functions in a single complex material system.
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 configuration ensures that the concentration of dissolved oxygen in the inner container body remains low, effectively preventing the deterioration of contents due to oxygen exposure, even after 60 days of storage.
Implementation Method 1
The resin constituting the inner container body contains an oxygen barrier agent and provides oxygen permeability such that, after the inner container body has been filled with content, the inner opening part is sealed, and the inner container body is allowed to stand for 60 days at a temperature of 20°C, the concentration of dissolved oxygen in the inner container body is 3 ppm or less
Data Source
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AI summary
Provided is a synthetic resin multilayer bottle capable of reliably preventing a content composed of a liquid seasoning that contains soy sauce from deteriorating due to oxygen in outside air. A synthetic resin multilayer bottle 1 includes an outer shell bottle 2, which can restore an original shape thereof in response to deformation attributable to pressing, an inner container body 3 which deforms when pressed, and an air channel 23 through which outside air is introduced between the outer shell bottle 2 and the inner container body 3. The synthetic resin multilayer bottle 1 has oxygen permeability such that, after the inner container body 3 is fully filled with distilled water from which dissolved oxygen has been removed, an inner opening part 17 is sealed, and the distilled water is allowed to stand for 60 days at a temperature of 20°C while keeping the air channel between the outer shell bottle and the inner container body open, the amount of dissolved oxygen in the distilled water is 3 ppm or less.