Plastic Bottle Intersecting Tension Bands for Pressure Stability
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Solution Overview
Problem
PET plastic containers deform under external and internal pressures, particularly lightweight containers with internal pressure from carbonation, and existing channel geometries fail to completely restrain axial and radial expansion while compromising stability after opening.
Innovation Solution
The design incorporates a peripheral wall with intersecting grooves and protrusions that form a stabilizing tension band structure, allowing for varying depths and cross-sections, which can be produced through blow molding, providing stability without uniform restriction in all directions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If transverse channels are used to limit radial expansion, then radial expansion is restrained, but axial height increases and stability after opening deteriorates
Solution Approach 1:
The patent transitions from transverse channels (horizontal dimension) to longitudinal grooves extending in the axial direction (vertical dimension). This dimensional change allows the grooves to restrain radial expansion through their circumferential arrangement while their longitudinal extension prevents excessive axial height increase by distributing the structural reinforcement along the container's length.
Solution Approach 2:
The patent divides the peripheral wall into multiple segments by creating several longitudinal grooves spaced circumferentially around the container. This segmentation allows each groove to independently restrain radial expansion in its local sector while the collective arrangement of multiple grooves provides overall structural stability without requiring excessive axial height.
2Stability of the object's composition
If channels are smoothed out under internal pressure, then deformation is accommodated, but rigidity after opening is lost and stability deteriorates
Solution Approach 1:
The patent creates grooves with specific local geometric properties (depth, width, spacing) that differ from conventional channels. These locally optimized groove characteristics allow the wall structure to accommodate deformation through controlled flexing while maintaining sufficient rigidity in the grooved regions to preserve stability after opening.
Solution Approach 2:
The grooves are pre-formed during the blow-molding process with predetermined geometric characteristics that prepare the peripheral wall to accommodate subsequent internal pressure deformation. The preliminary groove structure enables the material to flex in controlled ways during pressurization while maintaining post-opening stability.
3Weight of moving object
If the container is made more lightweight, then weight is reduced, but resistance to deformation under external and internal pressures deteriorates
Solution Approach 1:
The patent employs thin-walled construction with strategically placed longitudinal grooves that create a flexible yet stable structure. The grooves act as reinforcement elements within the thin wall, enabling the container to remain lightweight while the grooved pattern provides deformation resistance by creating a structured framework that distributes and manages stress under internal and external pressures.
Data Source
AI summary
Provided is a plastic container with a bottom area and a main body, which adjoins the bottom area in a longitudinal direction of the plastic container, wherein the main body includes a wall which extends all the way around in a circumferential direction of the plastic container and an opening area which at least indirectly adjoins the main body in the longitudinal direction and has a container opening, wherein the circumferential wall of the main body includes at least one first groove and/or elevation extending in a first direction and at least one second groove and/or elevation extending in a second direction.