Synthetic Resin Bottle Bottom Deformation Under Reduced Pressure
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Solution Overview
Problem
Conventional synthetic resin bottles face challenges in maintaining surface rigidity and preventing deformation when the inside is under reduced pressure, particularly as thickness reduction for weight savings compromises the trunk portion's shape retention.
Innovation Solution
The synthetic resin bottle design features a bottom portion with an annular peripheral portion, a protruding ridge, and radially inward depressed recess, along with tapered and evenly distributed groove portions, which facilitate inward displacement under reduced pressure, prioritizing stress focus on the grooves to prevent trunk portion deformation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of stationary object
If the thickness of the trunk portion is reduced for weight savings, then the bottle weight decreases, but the surface rigidity of the trunk portion decreases and the probability of improper deformation increases
Solution Approach 1:
The patent extracts the reduced pressure absorbing function from the trunk portion and relocates it to the bottom portion. By providing a deformable bottom portion with specific structural features (protruding ridge, depressed recess, groove portions), the invention allows the bottom to absorb reduced pressure through controlled deformation, thereby eliminating the need for a deformable trunk portion and maintaining trunk surface rigidity even with reduced thickness
Solution Approach 2:
The patent applies local quality by creating a bottom portion with non-uniform thickness and specific structural features (protruding ridge, depressed recess, groove portions) that concentrate stress and facilitate controlled deformation. The bottom portion has varying thickness (first thickness in peripheral area, second thickness in central area) and specific geometric features that make it preferentially deformable compared to the trunk portion, localizing the deformation to the bottom while maintaining trunk integrity
2Shape
If a deformable reduced pressure absorbing panel is provided in the trunk portion to prevent deformation, then the appearance is maintained, but the surface rigidity decreases and shape retention is compromised
Solution Approach 1:
The patent removes the reduced pressure absorbing panel from the trunk portion entirely and relocates this function to the bottom portion. The bottom portion is designed with specific deformable features (protruding ridge, depressed recess, groove portions) that enable it to absorb reduced pressure through controlled deformation, thereby maintaining trunk portion rigidity and eliminating the need for compromising trunk appearance with deformable panels
3Weight of stationary object
If the bottom portion is designed to facilitate deformation under reduced pressure, then weight reduction is achieved, but ground contact stability may be compromised
Solution Approach 1:
The patent applies local quality by creating a bottom portion with non-uniform thickness and specific structural features that concentrate stress in controlled locations. The protruding ridge and depressed recess create predetermined deformation zones that guide the deformation process, ensuring that the bottom portion deforms in a controlled manner that maintains ground contact stability while still achieving weight reduction through overall thickness reduction
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 enhances weight reduction while maintaining the bottle's appearance and surface rigidity by ensuring the bottom portion deforms before the trunk, increasing the absorbable volume and stabilizing ground contact.
Implementation Method 1
the inside of the bottle is placed under a significantly reduced pressure
Implementation Method 2
the bottom portion being configured to be deformed toward the inside of the synthetic resin bottle under a reduced pressure generated in the inside, thereby exhibiting a reduced pressure absorbing function
Data Source
AI summary
This disclosure relates to a synthetic resin bottle that exhibits a reduced pressure absorbing function by the bottom portion being displaced inward. A bottom portion includes: a peripheral portion having an annular shape; a protruding ridge disposed radially inward of the peripheral portion and configured to serve as a ground contacting portion of the synthetic resin bottle by protruding downward from the peripheral portion and configured, when deformed under a reduced pressure, to make the peripheral portion serve as the ground contacting portion by displaced toward an inside of the synthetic resin bottle (i.e., upward); and a depressed recess located radially inward of the protruding ridge and depressed toward the inside of the synthetic resin bottle. The peripheral portion includes a plurality of groove portions extending radiately.