Polymer Container Grip Structure Resisting Distortion
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Solution Overview
Problem
Lightweight polymer containers used for packaging liquids are prone to distortion or deflection when gripped, leading to unwanted spillage due to their flexibility, known as the 'volcano effect', which complicates handling and pouring.
Innovation Solution
The container design incorporates opposing grip areas with textured surfaces, circumferential ribs, horizontal body ribs, and vertical struts to enhance structural integrity and reduce distortion, featuring a blow-molded structure made from polyethylene terephthalate with specific dimensions and angles to minimize volume displacement under applied force.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If the container is made lightweight using flexible polymer material, then ease of lifting and manipulation is improved, but the container becomes prone to distortion and deflection when gripped, causing liquid spillage
Solution Approach 1:
The container body is segmented into multiple structural components including circumferential ribs that divide the body into sections, horizontal body ribs that create transverse segments, and vertical struts that partition the side walls. This segmentation distributes mechanical stresses across multiple discrete elements, preventing concentrated deformation when the container is gripped, thereby maintaining structural integrity while using lightweight flexible polymer material
Solution Approach 2:
The container incorporates grip areas with modified local properties including textured surfaces and recesses that concentrate user applied forces in specific zones. These locally modified areas are positioned to transmit forces away from the main body walls, preventing distortion in critical regions while maintaining overall lightweight construction. The circumferential and body ribs provide localized structural reinforcement where needed
2Weight of moving object
If the container wall is made thin to reduce weight, then ease of manipulation is improved, but the container exhibits excessive flexibility and distortion under gripping forces
Solution Approach 1:
The container employs three-dimensional structural elements (circumferential ribs extending around the body, horizontal body ribs crossing the interior, and vertical struts rising from the base) that add dimensional complexity to the thin-walled structure. These multi-dimensional features create a spatial framework that resists deformation in multiple directions simultaneously, maintaining shape stability while keeping wall thickness minimal for lightweight construction
Solution Approach 2:
The container integrates multiple material structures including the base polymer matrix combined with molded-in structural reinforcements (ribs and struts) that create a composite-like architecture. This composite structure combines the flexibility and lightness of thin polymer walls with the rigidity of integrated reinforcement elements, achieving both weight reduction and shape stability
3Ease of operation
If grip areas are formed in the side walls to facilitate handling, then ease of operation is improved, but the container distorts when force is applied to these grip areas
Solution Approach 1:
The grip areas are designed as recessed zones that extract or remove material from the main body wall thickness in specific locations. These recesses allow user fingers to insert and apply gripping forces directly to the grip area structures rather than to the main container walls. By taking out material to create dedicated grip zones, the design isolates handling forces from the structural walls, preventing distortion while maintaining ease of gripping
Data Source
AI summary
Container includes a top portion, a body portion and a bottom portion. The body portion includes a front wall, a rear wall and first and second side walls, the first side wall disposed opposite the second side wall, opposing grip areas formed in the first and second side walls, a first circumferential rib disposed above the opposing grip areas and extending horizontally about an entire outer circumferential perimeter of the body portion, a second circumferential rib disposed below the opposing grip areas and extending horizontally about the entire outer circumferential perimeter of the body portion, at least one horizontal body rib disposed between and spaced circumferentially from the opposing grip areas, a first vertical strut formed in the first side wall and a second vertical strut formed in the second side wall, each strut disposed between the first and second circumferential ribs and spaced a distance from each grip area.