Pump Dispenser Bottle Bottom with Curved Centre Part
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Solution Overview
Problem
Bottles for pump dispensers storing liquids with out-gassing components, particularly those containing oxidizers for hair coloration, face challenges in maintaining a long storage term due to increased internal gas pressure, which can lead to deformation and instability.
Innovation Solution
A bottle design featuring a convex center part with a concave outside face, a channel part for accommodating a dip tube, and stiffening ribs that increase the bottom part's stiffness, preventing popping out under high gas pressure, and allowing for efficient collection of out-gassed components, while maintaining stability and reducing residual liquid volume.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If the bottle stores liquids with out-gassing components for extended periods, then the storage term is improved, but the internal gas pressure increases causing the bottom part to pop out and deform
Solution Approach 1:
The centre part of the bottom is designed with a concave outside face and a convex inside face, creating a curved, dome-like structure. This curvature provides structural strength to resist the internal gas pressure generated by out-gassing components during storage, preventing the bottom part from popping out while extending the storage term.
Solution Approach 2:
The bottom part is segmented into distinct functional zones: a stand face for stability, a channel part for liquid collection, and a centre part with curved surfaces for pressure resistance. This segmentation allows each zone to perform its specific function optimally while working together to maintain overall bottom part stability under pressure.
2Strength
If the centre part is made convex at the inside face to resist pressure, then the resistance force is improved, but the bottom part becomes more complex
Solution Approach 1:
The stand face, channel part, and centre part with its curved surfaces are integrated into a single molded bottom part structure. This merging combines multiple functional elements into one component, achieving the required pressure resistance through the curved geometry without increasing the number of separate parts or manufacturing steps.
3Strength
If the channel part is formed as a protrusion at the outside face, then the side walls stiffen the bottom part, but the manufacturing precision requirements increase
Solution Approach 1:
The channel part is formed as a smooth protrusion with curved surfaces at the outside face of the centre part. These curved geometries provide structural stiffening to the bottom part while being amenable to conventional molding processes, avoiding the need for complex multi-step manufacturing or extremely tight tolerances.
Data Source
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AI summary
It is provided a bottle for a pump dispenser, comprising a bottle body for bordering a filling volume, wherein the bottle body comprises a bottom part for closing the filling volume at the bottom, the bottom part comprising a mainly ring-shaped stand face for placing the bottle onto a ground, a centre part arranged radially inside the stand face, wherein the centre part is formed mainly convex at an inside face pointing towards the filling volume and the centre part is formed mainly concave at an outside face pointing away from the filling volume, a channel part for accommodating a dip tube of a pump dispenser pump, wherein the channel part is formed as a deepening at the inside face of the centre part and the channel part is formed as a protrusion at the outside face of the centre part, and at least one stiffening rib connected with the outside face of the centre part and a side face of the channel part outside the filling volume. Due to the forming of the centre part and the channel part as well as due to the provided stiffening rib(s) the bottom part comprises a significantly increased stiffness against popping out the bottom part of the bottle body at increasing inside gas pressure, so that the filling volume of the bottle body may collect a higher amount of out-gassed components of a liquid over a longer storing term.