PEF Bottle Base Geometry for Carbonation Pressure Resistance
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Solution Overview
Problem
Existing PET bottles face limitations in base design due to stretchability and strain hardening, leading to issues with pressure resistance, especially for carbonated beverages, and there is a need for improved structural parameters in bottles made from renewable polymers like PEF.
Innovation Solution
A bottle design featuring a thermoplastic polymer of FDCA and diol monomers with a concave arch, reinforcing grooves, and base feet, allowing for a higher push-up height and increased number of grooves and feet, enhancing pressure resistance and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If PET is used for making bottles with stretch blow molding process, then good clarity and mechanical properties are achieved, but the base design is limited due to stretchability and strain hardening effects
Solution Approach 1:
The patent changes the material parameter from PET to PEF polymer, which has different physical and chemical properties. This material substitution enables higher push-up heights (1.5-3 times greater than PET) and allows for more aggressive base designs with deeper arches and more reinforcing grooves, directly resolving the contradiction between pressure resistance and base design flexibility
Solution Approach 2:
The invention uses PEF as a composite or alternative material to PET, leveraging the superior properties of PEF including its higher elongation at break and different strain hardening characteristics. This material substitution allows the base structure to be redesigned with greater geometric complexity while maintaining formability, thus enabling both improved pressure resistance and design versatility
2Strength
If the push-up height is increased to withstand internal pressure, then pressure resistance is improved, but the stretchability limit of PET is reached due to elongation at break and strain hardening
Solution Approach 1:
By changing the material from PET to PEF, the patent accesses a different region of the stress-strain curve with higher elongation capacity. This parameter change in material properties allows the manufacturing process to achieve higher push-up heights without hitting the strain hardening wall that limits PET, thus improving pressure resistance while maintaining ease of manufacture through better blowability
3Strength
If more reinforcing grooves and base feet are added to the base design, then stability and pressure resistance are improved, but the complexity of the base structure increases
Solution Approach 1:
The material transition to PEF changes the formability parameters, allowing the mold to successfully form more complex base geometries. The higher elongation and different flow characteristics of PEF enable the creation of bases with more grooves and feet without encountering the strain hardening limitations of PET, thus allowing increased structural complexity to be manufactured effectively
Data Source
Figure 1
Figure 2a~2b
Figure 2c~2d
AI summary
The invention concerns a bottle (1) molded from at least one thermoplastic polymer of at least one Furan Dicarboxylic Acid (FDCA) monomer, preferably 2,5- Furan Dicarboxylic Acid (2,5- FDCA) monomer, and at least one diol monomer, preferably Monoethyleneglycol (MEG) monomer, said bottle, having a main axis (X), being provided with a body (5) and a bottom base (6) extending from a lower end of the body (5),. The bottom base (6) comprises: - a peripheral seat (7) defining a laying plane (8); - a concave arch (10) which extends from the periphery of a central zone (11) of the bottom base (6) to the peripheral seat (7), said concave arch (10) having a rounded general shape with a concavity turned towards the outside of the container (1) and the middle point of the central zone (11) being named push-up (11a); - a series of reinforcing grooves (13) which extend radially from the central zone (11) to at least the peripheral seat (7); - base feet (14) located between two adjacent reinforcing grooves (13); According to the invention, the bottle bottom base (6) comprises a push-up height, defined as the height between the push-up (11a) and the laying plan (8), that is in the range of 7 to 10 mm for a bottle having a diameter (D) between 40 and 150 mm.