Three-Layer Housing Material for Volatile Substance Release

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Solution Overview

Problem

Existing apparatus for releasing volatile substances, such as fragrances or insecticides, into the ambient air face issues with premature diffusion through housing materials like paper or cardboard, leading to reduced substance availability and non-biodegradable residues that complicate disposal and recycling.

Innovation Solution

A three-layer housing material comprising a first layer of paper or cardboard, a second layer of polyethylene, and a third layer of oriented polypropylene with a barrier function, along with an insert made of plant-based fiber material, sucrose, or starch impregnated with the volatile substance, allowing controlled release and easy disposal/recycling.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If the housing is made of paper or cardboard, then the apparatus is biodegradable and easy to dispose of, but the volatile substance diffuses through the housing prior to use

Engineering Contradiction:

ImprovebiodegradabilityVSAvoidsubstance containment

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The housing is constructed as a multi-layer composite structure combining paperboard with plastic layers (polyethylene and polypropylene). This composite material provides both the barrier properties needed to prevent premature volatile substance diffusion and maintains partial biodegradability through the paperboard component, resolving the contradiction between containment reliability and ease of disposal.

Inventive Principle:

Principle #40Composite materials

2Reliability

If a plastic coating is applied to paper housing, then barrier function is improved, but disposal and recycling become more difficult

Engineering Contradiction:

Improvebarrier functionVSAvoiddisposal difficulty

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The housing is segmented into distinct functional layers: an inner paperboard layer providing structural form and partial biodegradability, middle polyethylene layers providing barrier properties, and outer polypropylene layers providing additional protection. This segmentation allows each layer to perform its specific function while enabling selective disposal approaches.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent specifies thin layer thicknesses (0.5-2 μm for polyethylene, 1-5 μm for polypropylene) to minimize the amount of non-biodegradable material while maintaining adequate barrier function. This parameter optimization reduces the conflict between barrier performance and environmental compatibility.

Inventive Principle:

Principle #35Parameter changes

3Ease of manufacture

If the housing structure is simplified for easy disposal, then disposal ease is improved, but barrier function against volatile substance permeation deteriorates

Engineering Contradiction:

Improvedisposal easeVSAvoidpermeation barrier

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The multi-layer composite structure combines materials with complementary properties: paperboard provides structural integrity and biodegradability, while thin plastic layers provide the necessary vapor barrier. This composite approach achieves adequate permeation protection without requiring thick single-layer constructions that would compromise disposal ease.

Inventive Principle:

Principle #40Composite materials

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 prevents premature diffusion of volatile substances, maintains a high partial pressure for controlled release, and facilitates disposal/recycling by using biodegradable components, ensuring effective and environmentally friendly operation.

Implementation Method 1

at least this third layer has a barrier function against permeation of the volatile substance

Methodology Applied

Scientific EffectPermeation barrier: Permeation

Implementation Method 2

the volatile substance can diffuse through the housing made of paper or paperboard even prior to the apparatus actually being used

Methodology Applied

Scientific EffectDiffusion: Diffusion

Data Source

PatentUS20230249442A1Apparatus having a housing made of an at least three-layer material for releasing a volatile substance into the ambient air

Publication Date: 2023.08.10 SWIF SOUTH WEST INT FRAGRANCE

AI summary

An apparatus for releasing a volatile substance into the air that includes a housing and an insert, the housing contains an at least three-layer first material; wherein a first layer of the at least three-layer first material contains or comprises paper or cardboard or paperboard, a second layer of the at least three-layer first material contains or comprises polyethylene, a third layer of the at least three-layer first material contains or comprises oriented polypropylene, the third layer has a barrier function against permeation of the volatile substance, and optionally the apparatus has at least one further barrier layer having a barrier function against permeation of the volatile substance, the insert is arranged inside the housing and made of a second material, the second material is provided or impregnated with the volatile substance.