PET Container Base Radial Straps Hydraulic Charge-Up
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Solution Overview
Problem
PET containers for hot fill applications face challenges in resisting fill pressures, absorbing vacuum pressures, and withstanding top loading forces while maintaining material integrity and minimizing weight.
Innovation Solution
A PET container design featuring a base with radial straps and recessed rib members, which places the container in a hydraulic charge-up state under top load, allowing the horizontal side ribs to collapse and constrain base movement, thereby maintaining shape and resisting deformation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If PET container material weight is reduced, then container weight is minimized, but the ability to resist fill pressures, absorb vacuum pressures, and withstand top loading forces deteriorates
Solution Approach 1:
The base is divided into multiple functional elements including radial straps extending from the central pushup portion, recessed rib members positioned between the straps, and a contact surface. This segmentation allows each element to perform specific functions: the pushup portion provides central support, the straps distribute radial loads, the ribs provide localized reinforcement, and the contact surface provides stable support. This segmented structure achieves superior mechanical performance with reduced material weight compared to conventional solid base designs.
2Ease of manufacture
If base structure is simplified to reduce manufacturing complexity, then ease of manufacture is improved, but the ability to maintain shape and resist deformation under load deteriorates
Solution Approach 1:
The base geometry is pre-configured during molding with the pushup portion, straps, and recessed ribs positioned to automatically provide structural support when the container is filled and cooled. The recessed rib members are pre-positioned to collapse inward under vacuum pressure, and the radial straps are pre-oriented to resist outward expansion during filling. This preliminary geometric configuration eliminates the need for additional reinforcement structures or complex assembly steps while maintaining excellent shape stability.
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 design effectively resists deformation and maintains shape under pressure and vacuum conditions, allowing for lighter construction while maintaining structural integrity and performance.
Implementation Method 1
The plurality of ribs and the base portion are configured to place the container in a state of hydraulic charge-up when top load is applied to the container after the container is filled
Implementation Method 2
shrinks back to approximately the original starting volume due to vacuum generated during the product cooling phase
Data Source
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AI summary
A container defining a longitudinal axis and a transverse direction that is transverse with respect to the longitudinal axis. The container includes a finish and a sidewall portion extending from the finish. A plurality of ribs are defined by the sidewall. A base portion extends from the sidewall portion and encloses the sidewall portion to form a volume therein for retaining a commodity. The base portion has a contact surface for supporting the container. A plurality of straps extend radially along the base portion away from the longitudinal axis in the transverse direction, each one of the straps defines a strap surface that is closer to the finish than the contact surface. The plurality of ribs and the base portion are configured to place the container in a state of hydraulic charge-up when top load is applied to the container after the container is filled.