Plastic Container Base Reshaping for Hot-Fill Stability
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Solution Overview
Problem
Thin-walled plastic containers are prone to deformation and vacuum-induced pressure issues, which can lead to rupture and increased content loss, especially in 'hot-fill' applications, and existing solutions complicate manufacturing and increase weight and cost.
Innovation Solution
A system comprising an actuator and base unit that applies pressure and heat to the container base, optionally dosing the headspace with inert gas, to stabilize internal pressure and reduce deformation, thereby enhancing container strength and reducing material requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If thin-walled plastic containers are used to reduce weight and material usage, then weight and material consumption are reduced, but container strength and resistance to deformation are reduced
Solution Approach 1:
The patent applies thermal energy to the container base to temporarily soften the plastic material, allowing it to be reshaped from an oval cross-section to a circular cross-section. This parameter change in material state enables the thin-walled container to achieve the geometric shape necessary for withstanding internal pressure and external impact forces, thereby improving strength without increasing wall thickness or weight.
Solution Approach 2:
The patent performs the base reshaping operation as a preliminary action before the container is filled and sealed. By pre-forming the base into a circular cross-section while the material is still thermally softened, the container is prepared in advance to withstand subsequent filling, sealing, and handling processes without deformation or rupture, eliminating the need for thicker walls.
2Strength
If conventional strengthening measures (ribs, grooves, thicker walls) are applied to prevent deformation, then container strength is improved, but device complexity and manufacturing complexity increase
Solution Approach 1:
The patent extracts and removes the need for conventional strengthening features such as ribs, grooves, and vacuum panels by fundamentally changing the base geometry from oval to circular cross-section. This extraction of unnecessary structural elements simplifies the container design while maintaining or improving strength characteristics, as the circular base inherently distributes stresses more effectively.
Solution Approach 2:
The patent changes the fundamental geometric parameter of the base cross-section from oval to circular, which inherently provides superior structural performance. This parameter change eliminates the need for additional strengthening features, reducing device complexity and manufacturing steps while achieving the desired strength and deformation resistance.
3Reliability
If hot-fill packaging is used to preserve product quality, then product preservation is improved, but vacuum pressure and internal deformation increase as contents cool
Solution Approach 1:
The patent performs base reshaping as a preliminary action before hot-filling and cooling. By establishing the correct circular base geometry while the material is thermally softened, the container is pre-prepared to withstand the subsequent cooling-induced vacuum pressure without deforming, ensuring both product preservation and structural integrity throughout the product lifecycle.
4Stress or pressure
If inert gas dosing is applied to headspace to control vacuum pressure, then internal pressure control is improved, but device complexity and manufacturing steps increase
Solution Approach 1:
The patent extracts and eliminates the need for inert gas dosing equipment and processes by designing a base geometry that passively resists vacuum-induced deformation. The circular cross-section base provides inherent structural support that maintains container shape during cooling, removing the complexity of gas dosing systems while achieving equivalent or superior pressure control through geometric design alone.
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 system effectively stabilizes internal pressure, reduces deformation, and minimizes material usage, improving container strength and efficiency while maintaining product quality and vendability.
Implementation Method 1
The base unit may include a heating surface configured to convey energy or heat to a portion of the base portion of the container
Implementation Method 2
The actuator may be configured to apply a force or pressure on a container to contact the base unit
Data Source
AI summary
A system for manufacturing a filled plastic container includes an actuator, a base unit including a heating surface, and a dispensing device or nozzle. The actuator includes a body portion and a holding/securing member configured to hold or secure a portion of the container. In embodiments, the actuator is configured to apply a force or pressure on the container to contact the base unit, the base unit is configured to receive a base portion of the container, the heating surface is configured to convey energy or heat to a portion of the base portion of the container, and the dispensing device or nozzle is configured to introduce an inert gas into the container. Methods for providing a filled plastic container and providing a thin-walled plastic container are also disclosed.