Double-Structured Aerosol Can Internal Pouch Layer Adhesion
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Solution Overview
Problem
Internal pouches in double-structured aerosol cans containing oxidizing hairdye agents face challenges in maintaining barrier properties and interlayer adhesion, especially when exposed to high temperatures and shocks, leading to potential peeling and blistering issues.
Innovation Solution
The internal pouches are designed with specific layer structures, including a polyolefin inner layer, adhesive resin layers, aluminum foil, and thermoplastic resin outer layers, with polyether type urethane resin on the inner side of the first pouch and polyester type urethane resin on the inner side of the second pouch, enhancing resistance against alkaline and acidic components and improving shock resistance through dry lamination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the internal pouch uses conventional laminated layers of metal foil and thermoplastic resin, then it provides basic barrier property and containment, but the layers peel off when receiving large shocks such as falling
Solution Approach 1:
The patent applies composite materials by creating a multi-layer laminated structure combining polyolefin inner layer, adhesive resin layer, aluminum foil, outer adhesive resin layer, and thermoplastic resin outer layer. This composite structure provides both barrier properties and enhanced shock resistance, preventing layer peeling under impact conditions.
Solution Approach 2:
The patent uses adhesive resin layers as intermediaries between the polyolefin inner layer and aluminum foil, and between aluminum foil and thermoplastic resin outer layer. These adhesive layers act as mediators that bond the different materials together, maintaining layer integrity even when the pouch receives shocks during storage or handling.
2Reliability
If the internal pouch uses conventional adhesive layers, then it maintains basic layer bonding, but the layers peel off or blister when stored at high temperatures of 40°C or above
Solution Approach 1:
The patent changes the chemical composition parameters of the adhesive resin layers by specifying polyether type urethane resin for the first pouch and polyester type urethane resin for the second pouch. These specific resin types have improved thermal stability and adhesion properties that prevent layer peeling and blistering even when stored at high temperatures of 40°C or above.
Solution Approach 2:
The patent applies different adhesive resin types to different pouches based on their specific requirements. The polyether type urethane resin is used in the first pouch containing strongly alkaline components, while polyester type urethane resin is used in the second pouch containing acidic components. This localized quality selection ensures optimal adhesion and temperature resistance for each pouch's specific chemical environment.
3Reliability
If the internal pouch uses simple single-layer structure, then it is easy to manufacture, but it cannot provide sufficient barrier property against oxygen and prevent content volatilization
Solution Approach 1:
The patent segments the pouch into multiple functional layers: a polyolefin inner layer for chemical resistance, adhesive resin layers for bonding, aluminum foil for barrier properties against oxygen and volatilization prevention, and a thermoplastic resin outer layer for mechanical protection. This segmented structure provides comprehensive protection while maintaining manufacturability through standardized lamination processes.
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 prevents the hairdye components from losing their function, volatilizing, or causing layer corrosion, while maintaining structural integrity even under shock and high temperature conditions, ensuring the hairdye's efficacy and safety.
Implementation Method 1
an adhesive resin layer on the inner layer side, an aluminum foil, an adhesive resin layer on the outer layer side
Implementation Method 2
the internal pouch for containing the first agent must have a high degree of oxygen shut-off property (barrier property) and must also work to prevent the content from volatilizing out of the internal pouch
Implementation Method 3
the adhesive resin forming the adhesive resin layer on the inner layer side of the first internal pouch comprises a polyether type urethane resin... the adhesive resin forming the adhesive resin layer on the inner layer side of the second internal pouch comprises a polyester type urethane resin
Data Source
AI summary
An internal pouch held in a double-structured aerosol can, composed of first and second internal pouches for containing first and second agents, respectively, the aerosol can being capable of simultaneously ejecting the first and second agents. The first internal pouch has a layer constitution that includes a polyolefin inner layer, an adhesive resin layer on the inner layer side, an aluminum foil, an adhesive resin layer on the outer layer side and a thermoplastic resin outer layer; the second internal pouch has a layer constitution that includes a polyolefin inner layer, an adhesive resin layer on the inner layer side, an aluminum foil, an adhesive resin layer on the outer layer side and a thermoplastic resin outer layer; and the adhesive resin forming the adhesive resin layer on the inner layer side of the first internal pouch contains a polyether type urethane resin.