Self-Heating Container Laminate for Shelf-Life and Air Activation
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Solution Overview
Problem
Conventional self-contained heating containers face issues with premature reaction of air-activated materials, leading to reduced heating capacity and shelf-life, due to inadequate oxygen and moisture barriers, and the limited zinc in these materials causing a finite heat source.
Innovation Solution
A container design featuring a laminate structure with a first web acting as a barrier, a second web with score lines defining plugs to allow air entry upon peeling, and a third web for holding contents, utilizing air-activated materials that react with oxygen to produce heat, while minimizing hydrogen gas accumulation and optimizing material selection for extended shelf-life and efficient heating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional packaging is used for air-activated heating material, then the packaging provides basic containment, but oxygen and moisture ingress causes premature reaction reducing shelf-life and heating capacity
Solution Approach 1:
The patent employs a multi-layer laminate structure comprising a first web with oxygen and moisture barrier layers, and a second web with heat-sealable layers. This composite construction provides superior protection against oxygen and moisture ingress compared to conventional single-material packaging, thereby preventing premature reaction of the air-activated heating material and extending shelf-life while maintaining heating capacity.
Solution Approach 2:
The packaging is divided into functionally distinct layers: the first web contains barrier layers specifically for oxygen and moisture protection, while the second web provides heat-sealable surfaces for hermetic sealing. This segmentation of functions within the packaging structure allows each layer to optimize its specific protective role, effectively preventing harmful factor ingress.
2Reliability
If the container provides robust oxygen and moisture barriers to prevent premature reaction, then shelf-life is extended, but the container complexity and manufacturing difficulty increase
Solution Approach 1:
The container is segmented into two distinct webs with specialized functions: the first web handles barrier protection while the second web handles sealing. This functional segmentation simplifies the design process by assigning specific roles to each component, making the overall complex structure more manageable and manufacturable through specialized production techniques for each web type.
Solution Approach 2:
The laminate structure serves multiple functions simultaneously: it provides oxygen barrier, moisture barrier, heat sealability, and structural integrity. By designing the packaging to fulfill multiple requirements through an integrated multi-layer system, the patent reduces the need for additional separate components, thereby managing complexity while achieving robust protection.
3Reliability
If a hermetic seal is used to prevent air entry, then the heating material remains stable during storage, but the consumer cannot activate the heater without breaking the seal
Solution Approach 1:
The packaging incorporates a dynamic sealing mechanism through the second web with heat-sealable layers that can be selectively broken or opened by the consumer. This dynamic design allows the package to transition from a hermetically sealed state during storage to an open state during activation, balancing material stability with user accessibility.
Solution Approach 2:
The container is pre-configured with heat-sealable layers that maintain hermetic sealing during storage and distribution. The sealing structure is designed in advance to allow controlled breaking or opening during consumer use, ensuring stability is maintained until activation while facilitating easy operation when needed.
4Object-affected harmful factors
If the container uses thick and robust packaging to ensure barrier performance, then protection against air ingress is improved, but the packaging weight and size increase
Solution Approach 1:
The patent uses thin-film laminate composite materials that provide superior barrier performance per unit thickness compared to conventional single-layer thick materials. The multi-layer construction with specialized barrier layers achieves effective oxygen and moisture protection while maintaining minimal thickness and weight, solving the contradiction between protection and weight.
Solution Approach 2:
The container employs flexible thin-film laminate structures that provide robust barrier performance without the weight and rigidity of thick rigid packaging. The thin-film construction with multiple functional layers delivers effective air ingress prevention while minimizing packaging weight and size for portability.
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 prolongs the shelf-life of the heating material and provides efficient, controlled heating without external energy sources, maintaining the heating capacity and product freshness, with reduced packaging thickness and weight, and improved manufacturing costs.
Implementation Method 1
the air-activated material may be configured to react with air entering the compartment via the openings to activate the material
Implementation Method 2
the air-activated material may be configured to react with oxygen from the air entering the container via the openings to activate the material, such that the contents of the container, for example, may be heated as a result
Implementation Method 3
The first web may act as a barrier against ingress of air into the compartment
Implementation Method 4
The at least one score line of the first film layer, the adhesive layer, and the score lines of the second film layer may, for example, define a plurality of tortuous paths through a thickness of the first web configured to allow hydrogen gas to escape from the compartment
Data Source
AI summary
A container is provided for heating items, such as contents of the container. The container has a compartment for storing an air-activated material for heating those contents. The compartment is formed between a first web of material and a second web of material, where the first web includes a first film layer laminated to a second film layer via an adhesive layer. The second film layer includes a plurality of score lines that define plugs, such that when the first film layer or a portion thereof is peeled away from the second film layer, the plugs are separated and displaced from the second film layer to create openings in the second film layer that allow air to enter the compartment. When the air contacts the air-activated material to activate the material, an exothermic reaction takes place that serves to produce heat, such as to heat the contents of the container.