Synthetic Resin Bottle Grip Design for Buckling Resistance
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Solution Overview
Problem
Conventional synthetic resin bottles with a waist dividing the body into upper and lower portions are prone to compression buckling in the upper body when subjected to large axial compression stress, compromising their appearance and structural integrity.
Innovation Solution
The bottle design incorporates two depressions on the rear side of the upper body portion opposed in the circumferential direction to form a grip, with vertical ribs or grooves on the step surfaces, a prismatic lower body portion, and transverse grooves or ribs on the back face of the grip, along with a concave region and dimples to distribute and absorb compression stress.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If two depressions are provided on the rear side of the upper body portion to define a grip, then portability and operability are improved, but compression buckling occurs in the upper body portion under large axial compression stress
Solution Approach 1:
The upper body portion is segmented by providing two depressions that define a grip, dividing the continuous surface into distinct regions. This segmentation allows the grip area to be structurally integrated while maintaining buckling resistance through the rib reinforcements at the depression boundaries.
Solution Approach 2:
Vertical ribs are provided at specific locations (front sides of the depressions) where structural support is most needed to prevent buckling. This local reinforcement strategy strengthens the upper body portion at critical points without adding overall weight or complexity, maintaining portability while improving buckling strength.
2Weight of moving object
If the upper body portion is made thinner to reduce weight, then weight is reduced, but buckling strength decreases under compression stress
Solution Approach 1:
Rather than uniformly thickening the upper body portion, vertical ribs are strategically placed at the front sides of the depressions to provide localized structural support. This allows the majority of the upper body to remain thin and lightweight while specific regions gain enhanced buckling resistance where the stress concentration occurs.
Solution Approach 2:
The vertical ribs add structural dimensionality to the thin upper body portion by creating three-dimensional reinforcing elements that extend vertically. This dimensional addition provides buckling resistance without significantly increasing the overall weight, as the ribs are thin-walled structures that add stiffness rather than bulk.
3Ease of operation
If additional handles are added to improve portability, then ease of carrying is improved, but device complexity increases
Solution Approach 1:
The grip function is merged into the body structure itself by forming two depressions that create a hand-holding cavity. This eliminates the need for separate handle attachments, as the bottle body itself provides the carrying function. The vertical ribs at the depression fronts serve dual purposes: structural reinforcement and grip definition.
Solution Approach 2:
The upper body portion serves multiple functions: it contains the liquid, provides structural support against buckling through the integrated ribs, and enables portability through the built-in grip formed by the depressions. This multi-functionality eliminates the need for separate components, reducing overall device complexity while maintaining all necessary functions.
Data Source
AI summary
A synthetic resin bottle including a body having a bottom, wherein the body is divided by a waist into an upper body portion and a lower body portion. The bottle is easily portable and operable without requiring an additional handle, etc. and has high buckling strength. The bottle has a dome-shaped upper body portion connected, with the waist in between, to the lower body portion having the bottom, a shoulder surrounding the upper end of the upper body portion, and a tubular neck part connected to the shoulder. Two depressions facing each other are arranged on the rear side of the upper body portion along its circumferential direction. The portion formed between the depressions functions as a grip, and vertical ribs are each provided on a step surface formed on the front side of each depression.