Aseptic Bottle Bottom Structure to Prevent Refrigeration Buckling
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Solution Overview
Problem
Aseptic filling bottles formed thin and lightweight to avoid high temperature exposure face challenges in maintaining strength, particularly during heated or refrigerated storage due to volumetric expansion causing bottom portion buckling, which affects stability and distribution.
Innovation Solution
The bottle design includes a central portion projecting inward from the grounding portion to the dome portion circumferential edge with a projection height greater than half the bottom height, combined with a receded groove portion and arcuate configuration, enhancing the bottom's strength to resist buckling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If the bottle is formed thin and lightweight to avoid high temperature exposure, then weight is reduced and heat resistance requirements are lowered, but strength of the bottom portion is reduced making it susceptible to buckling
Solution Approach 1:
The invention applies curvature by forming a domed shape at the center of the bottom portion and creating an arcuate raised portion that extends radially outward. This curved geometry distributes stress more effectively and increases structural strength without requiring additional material or weight, thereby resolving the contradiction between lightweight construction and bottom portion strength.
Solution Approach 2:
The invention transitions from a flat bottom surface to a three-dimensional structure by creating a domed center portion and an arcuate raised portion with specific height and radial extension. This dimensional change adds structural complexity in the vertical and radial directions, enhancing strength while maintaining the thin-walled lightweight construction.
2Adaptability or versatility
If the bottle is stored at elevated temperatures or refrigerated, then storage versatility is improved, but volumetric expansion of contents causes buckling of the bottom portion
Solution Approach 1:
The domed center portion and arcuate raised portion create a curved, structurally stronger bottom configuration that can accommodate volumetric expansion of contents during temperature variations. The curved geometry provides stress distribution and structural reinforcement that prevents buckling while allowing the bottle to be stored across a wide temperature range.
Solution Approach 2:
The raised portion with increased height (greater than half the bottom portion height) and the receded groove are designed in advance to counteract the buckling force that will occur during refrigerated or heated storage. This preliminary structural reinforcement prevents buckling before it occurs during temperature-induced expansion.
3Stability of the object's composition
If a dome-shaped receded portion is provided at the center of the bottom portion to suppress buckling, then bottom portion stability is improved, but weight reduction becomes difficult
Solution Approach 1:
The invention uses curvature (domed center portion and arcuate raised portion) to achieve buckling suppression without adding material weight. The curved geometry provides structural reinforcement through shape rather than through increased material thickness or mass, maintaining weight reduction while improving stability.
Solution Approach 2:
The invention maintains thin-walled construction throughout, using the thin plastic material formed into curved shapes (dome and arcuate raised portion) to achieve structural strength. This approach leverages the flexibility and formability of thin films to create strength through geometry rather than material quantity.
Data Source
Figure 1
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AI summary
Provided is an aseptic filling bottle that can suppress buckling of its bottom portion even at the time of refrigerated storage. A bottom portion (6) of the aseptic filling bottle includes a grounding portion (10) to be placed in contact with a surface on which the bottle is put, a central portion that projects to an inner side of the bottle as its extends radially inwards from the grounding portion (10), a dome portion (13) which projects to more inner side of the bottle than the central portion, and a receded groove portion (14) that extends radially from the dome portion (13). A bottom inner side projection height (D1) of the central portion at a dome portion side circumferential edge thereof is set greater than a half (D2) of a height from the grounding portion (10) to a border between the body portion and the bottom portion (6). The receded groove portion (14), at a position corresponding to the radial center position of the grounding portion (10), has a depth (D3) ranging from 5.0 mm to 10.0 mm.