Bottle Bottom Wall Annular Recess Decompression Absorption
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Solution Overview
Problem
Conventional synthetic resin bottles have limited decompression absorption performance due to their design, which restricts their ability to effectively manage internal pressure variations.
Innovation Solution
A bottle design featuring a bottomed cylindrical shape with a bottom wall portion that includes a rising circumferential wall, a movable wall with an annular recess, and a recessed circumferential wall, where the annular recess is formed to weaken the flow of synthetic resin material, allowing the outer sidewall to be thinner and more easily deformed, thereby enhancing decompression absorption performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the bottle uses a conventional bottom wall structure, then the structure is simple and easy to manufacture, but the decompression absorption performance is limited
Solution Approach 1:
The bottom wall portion is segmented into multiple functional regions: ground portion, rising circumferential wall portion, movable wall portion, and recessed circumferential wall portion. Each segment serves a specific purpose in the decompression absorption mechanism, allowing the structure to handle complex decompression forces through coordinated movement of discrete parts rather than a monolithic structure.
Solution Approach 2:
The movable wall portion is designed to dynamically respond to decompression forces by pivoting upward around the connecting portion with the rising circumferential wall portion. This dynamic movement allows the bottom wall to actively absorb decompression rather than passively resisting it, improving reliability while maintaining structural simplicity.
2Reliability
If the outer sidewall portion is made thinner to improve deformability, then decompression absorption performance improves, but the structural strength may be reduced
Solution Approach 1:
The annular recess creates a local variation in wall thickness and material distribution. The outer sidewall portion is made thinner locally to enhance deformability and decompression absorption, while the overall bottom wall structure maintains sufficient strength through the ground portion and rising circumferential wall portion. This local quality change allows the structure to be weak where needed for deformation and strong where needed for support.
Solution Approach 2:
The outer sidewall portion is designed as a thin, flexible structure that can easily deform during decompression events. This thin-walled section acts as a flexible element that absorbs pressure variations, while the connection to the more rigid ground portion and rising circumferential wall provides structural support, creating a composite system that combines flexibility and strength.
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 improves decompression absorption performance by allowing the bottle to actively deform and absorb internal pressure variations without deforming other structural components, resulting in enhanced durability and pressure management.
Implementation Method 1
when the material arrives at an area in the cavity inner surface in which the annular recess is formed, the force of the flow of the synthetic resin material is weakened
Implementation Method 2
the movable wall portion allows the recessed circumferential wall portion to move upward
Implementation Method 3
decompression in the bottle is absorbed as the bottom wall portion pivots about a connecting portion with the rising circumferential wall portion
Data Source
AI summary
A bottomed cylindrical bottle formed of a synthetic resin material through biaxially oriented blow molding, includes a bottom portion of the bottle having a bottom wall portion, the bottom wall portion including a ground portion disposed at an outer circumferential edge portion, a rising circumferential wall portion continuously extending upward so as to be connected to the ground portion from an inside in a bottle radial direction, a movable wall portion protruding from an upper end portion of the rising circumferential wall portion toward the inside in the bottle radial direction, and a recessed circumferential wall portion having a diameter in the bottle radial direction such that the diameter gradually decreases in a direction from an inner end portion of the movable wall portion toward an upper side thereof, an annular recess depressed upward being formed at the movable wall portion in a circumferential direction thereof.