Heat generator
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Solution Overview
Problem
Heat generators with incorporated volatile components face issues of migration and adsorption during storage, leading to decreased functionality and non-uniform warming effects due to direct contact with the heat-generating section or permeation through gas-permeable packaging.
Innovation Solution
A heat generator design featuring a pressure-sensitive adhesive layer with a volatile component, where gas barrier layers are integrated into both the packaging material and a release sheet, preventing the volatile component from adhering to the heat-generating section during storage and maintaining its effectiveness during use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a volatile component is incorporated into a heat generator, then the functional effects (scent, coolness) are improved, but the volatile component migrates and adsorbs onto the heat-generating section during storage, causing the warming function to decrease or become non-uniform
Solution Approach 1:
The patent introduces a volatile component-containing layer as an intermediary between the heat-generating section and the external environment. This layer contains the volatile component (menthol, camphor, or eucalyptus oil) in a controlled manner, allowing it to provide functional effects (coolness, scent) without directly contacting the heat-generating section. The intermediary layer prevents adsorption of the volatile component onto the heat-generating section while still enabling the desired functional effects during use.
Solution Approach 2:
The heat generator is segmented into distinct functional layers: a heat-generating section, a volatile component-containing layer, and a packaging body. This segmentation isolates the volatile component from the heat-generating section during storage while allowing controlled interaction during use. The packaging body with gas permeability control further segments the system to regulate volatile component release.
2Adaptability or versatility
If the packaging body has gas permeability to allow volatile component release, then the scent function is improved, but the volatile component permeates into the heat-generating section during storage, causing the warming function to decrease
Solution Approach 1:
The packaging body is designed with different gas permeability characteristics for different regions or time periods. During storage, the packaging maintains low gas permeability to prevent volatile component loss and heat-generating section degradation. During use, the packaging allows increased gas permeability to enable volatile component release for scent function. This local quality variation in gas permeability resolves the contradiction between scent function and warming function preservation.
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 solution effectively stabilizes the volatile component within the adhesive layer, ensuring consistent and enhanced warming performance by preventing migration and adsorption, thus maintaining the heat generation characteristics and sensory effects.
Implementation Method 1
migration and adsorption of the volatile component into the heat-generating section during storage
Implementation Method 2
a heat-generating section for generating heat that is transmitted to an adherend
Data Source
AI summary
The purpose of the present invention is to provide a heat generator that contains a volatile component and in which the volatile component is stably maintained during storage, the volatile component is prevented from adhering to a heat-generating section, and it is possible to achieve an excellent warming effect during use. This heat generator comprises a heat-generating section (1), an accommodation body (2) for accommodating the heat-generating section (1), an adhesive layer (3) provided to an attachment surface side of the accommodation body (2), and a release sheet (4) provided to the attachment surface side of the adhesive layer (3). As a result of including a volatile component in the adhesive layer (3) and respectively providing gas barrier layers (211), (41) to a first packaging material (21) constituting the attachment surface side of the accommodation body (2) and to the release sheet (4), it is possible to stably maintain the volatile component within the adhesive layer (3) during storage. It is thereby possible to prevent the volatile component from adhering to the heat-generating section (1) during storage and to achieve an excellent warming effect during use.