Polymeric Container Base Inversion for Hot-Fill Pressure Control
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Solution Overview
Problem
Current hot-fill methods for polymeric containers result in an internal vacuum as the product cools, which can lead to container damage during handling and storage.
Innovation Solution
Mechanically inverting the base of the polymeric container before the heated product cools, creating a positive pressure within the container during conveying and handling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the container base is inverted after cooling, then the container can be handled and stored, but an internal vacuum develops causing container damage during handling
Solution Approach 1:
The base inversion is performed before the product cools and vacuum forms, proactively preventing the harmful vacuum effect. The base is inverted while the product is still hot, creating positive pressure that counteracts the subsequent vacuum formation during cooling, thereby preventing container damage before it occurs.
Solution Approach 2:
The inversion process applies a counteracting force to the vacuum pressure that would otherwise damage the container. By inverting the base before cooling, the system creates positive pressure internally to oppose the formation of negative pressure (vacuum), effectively neutralizing the harmful effect before it can cause damage.
2Reliability
If the base is inverted before cooling, then positive pressure is created preventing vacuum formation, but the container must be handled at higher temperature
Solution Approach 1:
The base inversion is performed as a preliminary step before the cooling process begins, while the product is still at elevated temperature. This timing ensures that the positive pressure is established before vacuum formation can occur during subsequent cooling, preventing container damage while accepting that handling occurs at higher temperatures.
3Stability of the object's composition
If the base is inverted after filling and capping, then the container structure is stabilized, but the internal vacuum causes denting and damage during conveying
Solution Approach 1:
The base inversion is performed before the cooling and vacuum formation stages, proactively stabilizing the container structure before harmful vacuum pressures develop. This preliminary inversion creates positive pressure that prevents the subsequent vacuum-induced denting and damage during conveying operations.
Solution Approach 2:
The inversion process applies counteracting force to prevent vacuum pressure from damaging the container structure. By inverting the base before cooling, the system creates internal positive pressure to oppose the formation of negative pressure, thereby preventing structural damage during conveying and storage.
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 positive pressure created by inverting the container base reduces the risk of denting and damage during handling and storage, while also minimizing spilling and overflow when the container is opened.
Implementation Method 1
mechanically inverting a base of the polymeric container prior to the heated product cooling in order to create a positive pressure within the container
Implementation Method 2
After filling, the container is capped to integrally seal the container with a closure. After sealing the container begins to cool, which causes an internal vacuum to develop within the container.
Data Source
AI summary
A method for hot-filling a polymeric container with heated product. The method includes mechanically inverting a base of the polymeric container prior to the heated product cooling in order to create a positive pressure within the container prior to cooling, and a vacuum in the container after cooling.