Wavy-Rib Bottle Bell Structure for Low-Resin Pressure Resistance
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Solution Overview
Problem
Plastic beverage containers face challenges in maintaining structural integrity under stress and pressure while minimizing resin usage, particularly in film-only packaging scenarios where additional support elements like paperboard are removed, leading to increased bending and point loading failures.
Innovation Solution
The design incorporates varying depth ribs and strap ribs that distribute bending and top load forces, along with a steeper bell portion and flat foot base, to enhance resistance to bending, leaning, and stretching while maintaining stiffness and hoop strength, using less resin.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If resin usage is reduced to lighten weight, then transportation and manufacturing costs decrease, but structural integrity and resistance to bending and point loading failures worsen
Solution Approach 1:
The bottle wall is segmented into multiple ribs (first ribs, second ribs, third ribs) that are distributed around the circumference. These ribs divide the wall structure into discrete load-bearing segments that collectively provide enhanced structural integrity while using less resin than a solid wall of equivalent thickness would require.
Solution Approach 2:
Different regions of the bottle wall have different rib configurations optimized for their specific functional requirements. The grip portion has ribs oriented to resist bending during handling, the label portion has ribs to prevent label separation, and the base area has ribs to resist point loading. This localized optimization allows minimal resin usage while maintaining strength where needed.
2Loss of substance
If auxiliary packaging is removed to reduce packaging material, then environmental impact and cost decrease, but stress on bottles increases leading to more failures
Solution Approach 1:
The rib structures are pre-formed during the blow-molding process to provide built-in structural reinforcement before the bottles are subjected to shipping and handling stresses. This preliminary structural preparation ensures that bottles can withstand the increased stresses of film-only packaging without additional auxiliary support.
Solution Approach 2:
The bottle structure combines the PET resin matrix with integrated rib reinforcements to create a composite-like structure. The ribs act as structural elements within the resin matrix, providing enhanced mechanical properties that enable reliable film-only packaging without compromising bottle integrity.
3Productivity
If resin usage is minimized to improve productivity, then manufacturing efficiency increases, but manufacturing precision and structural performance may be compromised
Solution Approach 1:
Rather than providing continuous full-thickness material throughout the bottle wall, the design applies reinforcement ribs only at specific locations and orientations where structural support is needed. This partial action approach uses resin more efficiently, maintaining structural performance while reducing overall resin consumption and improving manufacturing efficiency.
Solution Approach 2:
The rib structures are designed with specific geometric parameters (depth, spacing, orientation) that are optimized during the blow-molding process. By carefully controlling these parameters, the design achieves the necessary structural performance with minimal resin, allowing efficient manufacturing without sacrificing precision or performance.
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 achieves improved structural performance with reduced resin usage, maintaining bottle shape and integrity under pressure, preventing deformation and label separation, and facilitating easier blow-molding processes.
Implementation Method 1
PET and other resins tend to relax at temperatures normally seen during use. 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.
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.