Multi-Layer Volatile Dispenser Structure for Humidity Stability
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Solution Overview
Problem
Existing volatile material dispensers face issues such as curling, tearing, and instability due to high humidity and temperature, leading to ineffective volatile material emission and premature product degradation.
Innovation Solution
A multi-layer article with a high-density polyethylene outer layer, nylon inner layer, and ethylene vinyl acetate upper layer, heat-sealed in a non-active state, ensuring structural integrity and controlled volatile material release.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a thin film dispenser is used to passively emanate volatile material, then the device complexity is reduced, but the structural strength deteriorates causing curling and tearing
Solution Approach 1:
The patent applies composite materials by combining multiple film layers with different properties: a volatile material-containing layer, a support layer for mechanical strength, and a sealant layer for hermetic sealing. This composite structure resolves the contradiction by providing both the simplicity of a thin-film passive dispenser and the structural integrity needed to prevent curling and tearing.
Solution Approach 2:
The patent uses flexible thin films as the core dispensing mechanism, where the volatile material is contained within a folded film structure that is heat-sealed at the edges. The thin film provides passive emanation through diffusion while the flexible nature allows it to conform to various mounting surfaces without requiring rigid support structures.
2Device complexity
If a thin film dispenser is used, then the device complexity is reduced, but the stability deteriorates in high humidity conditions
Solution Approach 1:
The composite film structure includes a sealant layer that provides hermetic sealing to prevent moisture ingress, and a support layer that maintains structural stability. This composite design resolves the contradiction by maintaining both simplicity and stability in high humidity environments where single-layer films would absorb moisture and curl.
Solution Approach 2:
The film structure is pre-folded and heat-sealed in a controlled manufacturing process to create a stable three-dimensional configuration before deployment. This preliminary action prevents the film from curling during storage and installation, and the hermetic seal prevents moisture absorption that would cause instability in high humidity conditions.
3Reliability
If heat sealing is applied to seal the film, then the seal effectiveness is improved, but the manufacturing precision requirement increases
Solution Approach 1:
The patent specifies controlled parameter ranges for the heat sealing process, including temperature (sufficient to melt the sealant layer), pressure (to ensure contact between sealing surfaces), and time (to achieve complete sealing). By defining these parameters within acceptable ranges rather than requiring exact values, the invention improves seal effectiveness while maintaining reasonable manufacturing precision requirements.
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 multi-layer design maintains stability and efficacy in high humidity and temperature conditions, retaining 85% of the initial volatile agent dosage for two months and emitting at a consistent rate of 1-4 mg/day, eliminating the need for additional support structures.
Implementation Method 1
the first portion and the second portion of the upper layer are heat sealed in the non-active state
Data Source
AI summary
A multi-layer article includes a non-active state and an active state. The multi-layer article includes an outer layer with a first side and a second side, and at least one inner layer that is disposed adjacent to at least a portion of the outer layer and that includes a volatile material therein. The at least one inner layer is coupled to the outer layer in both the active state and the non-active state. The multi-layer article is folded along an axis so that an upper portion of the multi-layer article is disposed on a lower portion of the multi-layer article. The outer layer is a non-porous, non-permeable material that includes an aperture.