Swirl Bell Bottle With Wavy Ribs Resists Deformation
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Solution Overview
Problem
Plastic bottles face challenges in maintaining structural integrity during shipping and handling, especially with the removal of auxiliary packaging, which increases stress and leads to bending, point loading failures, and deformation, while also seeking to minimize resin usage for lighter weight.
Innovation Solution
The design incorporates varying depth ribs and strap ribs that distribute bending forces, maintain hoop strength, and provide resistance to leaning and stretching, allowing for a lightweight bottle with improved stability and resistance to deformation, using polyethylene terephthalate (PET) with viscoelastic properties, and a flat foot base with strap ribs to prevent base rollout.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of stationary object
If auxiliary packaging is removed to reduce packaging weight and cost, then packaging weight and cost are reduced, but bottle structural integrity deteriorates under increased stress during shipping and handling
Solution Approach 1:
The bottle is segmented into multiple functional zones with different rib configurations: a grip portion with circumferential grip ribs for handling, a label portion with label panel ribs for label support, and a base portion with strap ribs and load ribs for structural support. This segmentation allows each zone to be optimized for its specific function while collectively providing overall structural integrity without auxiliary packaging.
Solution Approach 2:
Different regions of the bottle are given different local qualities through varying rib depths and configurations. The base portion has deeper strap ribs and load ribs for maximum structural support where stress is highest during shipping. The grip portion has circumferential ribs for handling stability. The label portion has ribs optimized for label support. This local quality differentiation allows the bottle to withstand shipping stresses without auxiliary packaging while using resin efficiently.
2Quantity of substance
If resin usage is reduced to create lighter weight bottles, then transportation cost is reduced, but resistance to bending and deformation deteriorates
Solution Approach 1:
The rib structure is segmented into multiple functional types (circumferential grip ribs, vertical label panel ribs, diagonal strap ribs, and load ribs) that work together to provide comprehensive structural support. This segmentation allows the resin to be distributed strategically to provide maximum strength where needed while minimizing overall resin usage for lightweighting.
Solution Approach 2:
The rib structures extend in multiple dimensions: circumferential ribs provide hoop strength, vertical ribs provide axial support, and diagonal strap ribs provide cross-bracing. This multi-dimensional rib configuration creates a three-dimensional structural network that resists bending and deformation forces from multiple directions, maintaining strength while using less resin than a uniformly thick wall design.
3Weight of moving object
If bottle wall thickness is reduced for lightweighting, then weight is reduced, but resistance to internal pressure and shape maintenance deteriorates
Solution Approach 1:
The bottle employs local quality differentiation through strategically placed ribs of varying depths at specific locations (grip portion, label portion, base portion) rather than uniform wall thickness. This allows thin-walled construction for lightweighting while providing localized reinforcement where structural support is needed to maintain shape and resist internal pressure during carbonation and handling.
Solution Approach 2:
The rib configurations incorporate curved and diagonal orientations (such as the diagonal strap ribs extending from the base) that better distribute internal pressure forces compared to straight vertical ribs. The curved geometry of the ribs helps redirect internal pressure loads along the rib structures, improving pressure resistance and shape maintenance in a lightweight design.
4Strength
If deep ribs are added to increase structural strength, then resistance to bending and deformation is improved, but blow-molding process complexity and difficulty increase
Solution Approach 1:
The complex rib structure is segmented into multiple independent rib types (circumferential grip ribs, vertical label panel ribs, diagonal strap ribs, load ribs) that can be formed using standard blow-molding techniques. Each rib type is designed to be manufacturable with existing equipment while collectively providing comprehensive structural support that would be difficult to achieve with a single complex rib design.
Solution Approach 2:
Rather than using a few extremely deep ribs that would be difficult to mold, the design uses multiple ribs of moderate depth distributed throughout the bottle structure. This partial action approach achieves comparable or superior structural strength through distributed reinforcement while remaining within the capabilities of standard blow-molding processes, avoiding excessive rib depth that would complicate manufacturing.
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 solution effectively reduces resin usage while maintaining mechanical performance, enhancing the bottle's ability to resist pressures and maintain shape during handling and pressurization, preventing deformation and label failure, and allowing for efficient blow-molding processes.
Implementation Method 1
PET has viscoelastic properties of creep and relaxation. As a plastic, PET and other resins tend to relax at temperatures normally seen during use. This relaxation is a time dependent stress relieving response to strain.
Implementation Method 2
This relaxation is a time dependent stress relieving response to strain. Bending can provide exaggerated strains over what would be seen in tensile loading. Due to exaggerated strains, the relaxation in bending can be much more severe.
Implementation Method 3
Pressure inside a bottle can be due to the bottle containing a carbonated beverage. Pressure inside a bottle can be due to pressurization procedures or processes performed during bottling and packaging.
Data Source
AI summary
An apparatus is provided for a container comprising a base, a bell, a sidewall between the base and the bell, a neck and a finish which define an opening to an interior of the container, and a shoulder between the sidewall and the bell. Strap ribs extend from a central portion of the base and terminate at the sidewall. The strap ribs cooperate with vertically aligned recessed columns of the sidewall to resist bending, leaning, crumbling, or stretching along the sidewall and the base. An inwardly offset portion of the sidewall is disposed between each pair of adjacent recessed columns. The inwardly offset portions of the sidewall are configured to resist outward bowing of the sidewall due to internal pressure of contents within the container.