Plastic Aerosol Container Dome Base Pressure Resistance
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Aerosol containers made of metal can rust and emit undesirable substances, while glass containers are prone to breaking, and plastic containers face challenges with high internal pressures, stress cracking, and flammability, making them unsuitable for pressurized applications.
Innovation Solution
An injection-molded plastic aerosol container with a convex dome-shaped preform base and a standing region that projects axially, providing increased stiffness and resistance to internal pressures, and designed to prevent stress cracking and contact with soap solutions, using a valve unit for pressure-tight closure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If plastic containers are used for aerosol applications, then manufacturing cost and energy efficiency are improved, but resistance to high internal pressures deteriorates
Solution Approach 1:
The patent changes the geometric parameters of the container base by introducing a convex dome shape with specific curvature radius (R1) and height (h1), which transforms the stress distribution under internal pressure and enables plastic containers to withstand aerosol pressure requirements while maintaining manufacturing advantages
Solution Approach 2:
The convex dome-shaped base with curved surfaces replaces flat or concave base designs, utilizing spherical geometry to distribute internal pressure evenly across the base structure, thereby increasing pressure resistance without requiring thicker walls or more complex manufacturing processes
2Weight of moving object
If plastic containers with small wall thicknesses are used, then weight and manufacturing simplicity are improved, but flammability and stress cracking resistance deteriorate
Solution Approach 1:
The patent applies different geometric characteristics to different regions of the container, specifically making the base region convex and dome-shaped with optimized curvature, while maintaining thinner walls in the cylindrical body section, thereby achieving localized strength enhancement where pressure stresses are highest without increasing overall weight
Data Source
AI summary
The present disclosure relates to an aerosol container made of plastic, the container having a neck, the opening of which is closeable in a pressure-tight manner by a valve unit that can be actuated by a pushbutton, the container being Tillable with a liquid or gaseous propellant and a liquid to be sprayed. The aerosol container can be an injection cast preform with an elongated tubular preform body. The preform body is closed by a dome-shaped convex preform base, beyond which an integrally formed stand region projects in an axial direction. The preform body adjoins the opening of the neck at the opposite axial longitudinal ends of the preform body.