Bottle Annular Groove Axial Contraction Pressure Stability
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Solution Overview
Problem
Bottles made of synthetic resin, such as PET, deform irregularly when internal pressure drops, leading to aesthetic and operational issues due to uncontrolled contraction in both axial and radial directions, resulting in bent necks and folded wrinkles, which impair appearance and functionality.
Innovation Solution
A bottle design featuring an annular groove on its outer surface that contracts and deforms axially, with varying wall surfaces and protrusions to absorb pressure changes, stabilizing the bottle's posture and preventing irregular deformations like neck bending and folded wrinkles, by allowing axial contraction while managing radial pressure through elastic deformation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If the bottle body is made thin to reduce weight, then the weight and cost are reduced, but the body deforms irregularly when internal pressure drops
Solution Approach 1:
The bottle body is segmented into multiple regions with different thicknesses. The bottom portion has greater thickness to provide structural support during pressure reduction, while the upper portion remains thinner to maintain light weight. This segmentation allows the bottle to achieve both weight reduction and shape stability.
Solution Approach 2:
Different portions of the bottle body have different wall thicknesses tailored to their specific functional requirements. The bottom portion, which experiences greater stress during pressure reduction, has increased thickness for enhanced stability, while other areas maintain thinner walls to minimize overall weight.
2Stability of the object's composition
If a pressure-reduction absorption panel is added to suppress irregular deformation, then the body shape stability is improved, but the design freedom is restricted
Solution Approach 1:
The pressure-reduction absorption function is merged into the bottle body structure itself through variable wall thickness design, rather than adding a separate panel component. This integration maintains design freedom while achieving shape stability during pressure reduction.
Solution Approach 2:
The bottle body structure serves multiple functions: it contains the beverage, maintains structural integrity, and actively absorbs pressure reduction effects through its variable thickness design. This multi-functionality eliminates the need for separate pressure-absorption components.
3Stress or pressure
If the bottle contracts and deforms in the axial direction to absorb pressure change, then the pressure reduction effect is achieved, but the neck may bend and appearance degrades
Solution Approach 1:
The bottom portion of the bottle is designed with greater thickness and structural reinforcement to serve as the primary pressure-absorbing element. This localized design ensures that axial contraction occurs mainly in the bottom region, protecting the neck area from bending and deformation.
Solution Approach 2:
The bottle is segmented into a rigid upper portion (including the neck) and a more compliant lower portion (the bottom). This segmentation allows the bottom to contract axially to absorb pressure changes while the neck maintains its shape and structural integrity.
4Stress or pressure
If the bottle contracts in both axial and radial directions during pressure reduction, then the pressure change is absorbed, but folded wrinkles appear and appearance degrades
Solution Approach 1:
The bottom portion is designed with specific thickness and structural characteristics that enable it to absorb pressure changes primarily through axial contraction rather than radial contraction. This localized design control prevents the formation of folded wrinkles on the bottle surface.
Solution Approach 2:
Instead of allowing the entire bottle to contract freely in both axial and radial directions, the design inverts the approach by constraining radial contraction through increased bottom thickness and guiding the deformation to occur primarily in the axial direction at the bottom, thereby preventing surface wrinkling.
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 bottle effectively absorbs pressure changes, maintains stability, and prevents irregular deformations like neck bending, ensuring a consistent appearance and reliable functionality even after pressure reduction, allowing for easier filling and storage.
Implementation Method 1
the body is capable of being contracted and deformed in the axial direction (longitudinal direction) with the annular groove as a center... a pressure change at the time of pressure reduction can be absorbed by contracting and deforming the body in the axial direction
Data Source
AI summary
Disclosed is a bottomed tubular bottle including an annular groove which is formed so as to be circumferentially and radially recessed inward along the outer peripheral surface of a body of the bottle with a bottle axis as a center and which contracts and deforms the body in the axial direction of the bottle when the internal pressure is reduced. The annular groove is recessed and formed by a first wall surface arranged on a mouth side of the bottle and a second wall surface arranged on a bottom side of the bottle. The body is formed so that the outer diameter on the bottom side is larger than the outer diameter on the mouth side with the annular groove interposed therebetween.