Synthetic Resin Bottle Bottom Inward Displacement Under Vacuum
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Solution Overview
Problem
The hot filling method for synthetic resin bottles can cause unsightly deformation of the bottom due to reduced pressure absorption, leading to an outer diameter exceeding the maximum defined diameter, which results in issues during manufacturing processes like transfer.
Innovation Solution
A synthetic resin bottle design with an annular-shaped peripheral portion, a protruding ridge, and a depressed recess, along with radiately extending groove portions, allows the bottom to displace inward under reduced pressure, maintaining the outer diameter within the defined limits and preventing radial deformation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the bottom is designed to be easily deformable to absorb reduced pressure, then the reduced pressure absorption function is improved, but the outer diameter of the bottom may exceed the maximum defined diameter causing deformation troubles
Solution Approach 1:
The bottom is designed with non-uniform thickness distribution, having thinner regions (first and second bottom portions) for reduced pressure absorption and thicker regions (peripheral portion) for maintaining outer diameter control. This local quality variation allows different parts of the bottom to serve different functions simultaneously.
Solution Approach 2:
The bottom is segmented into multiple functional regions: a peripheral portion with larger thickness for dimensional control, and inner bottom portions with smaller thickness for reduced pressure absorption. This segmentation allows the bottom to independently manage both outer diameter control and reduced pressure absorption functions.
2Reliability
If a reduced pressure absorbing panel is provided in the trunk, then the reduced pressure absorption function is improved, but the appearance of the bottle undergoes unsightly deformation and design flexibility is reduced
Solution Approach 1:
The reduced pressure absorption function is extracted from the trunk and relocated to the bottom of the bottle. By providing the bottom with reduced pressure absorption capability through thickness variation, the need for a separate reduced pressure absorbing panel in the trunk is eliminated, thus maintaining the trunk's appearance and design flexibility.
3Ease of manufacture
If the bottom is made with uniform thickness for manufacturing simplicity, then the ease of manufacture is improved, but the reduced pressure absorption function and shape retainability are reduced
Solution Approach 1:
The bottom is designed with local quality variation in thickness, having thinner regions for reduced pressure absorption and thicker peripheral regions for dimensional control. This can be achieved through controlled cooling rates or injection timing in the molding process, balancing manufacturing feasibility with functional requirements.
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
This design ensures the outer diameter of the bottle bottom remains within the specified maximum diameter, preventing deformation-related troubles during manufacturing and maintaining the bottle's shape integrity and surface rigidity.
Implementation Method 1
the bottom being configured to be displaced toward an inside direction of the synthetic resin bottle under a reduced pressure generated in the inside, thereby exhibiting a reduced pressure absorption function
Data Source
AI summary
A synthetic resin bottle, wherein a bottom includes: an annular-shaped peripheral portion; a protruding ridge disposed radially inward from the peripheral portion and configured to serve as a ground contacting portion of the bottle by protruding downward from the peripheral portion and configured, when deformed under reduced pressure, to make the peripheral portion serve as the ground contacting portion by displaced toward an inside of the bottle (upward); and a depressed recess located radially inward from the protruding ridge and depressed toward the inside of the bottle. The peripheral portion has an outer diameter dimension less than that of a lower end portion of the trunk, or a plurality of radiately extending groove portions is arranged side by side at an equal interval in the circumferential direction in the peripheral portion.