Square Bottle Peripheral Groove Design for Deformation Control

Solution Overview

Problem

Conventional square bottles are prone to improper deformation from a square or rectangular shape to a flat shape, such as a rhombus, during pressure reduction after heat filling.

Innovation Solution

The design includes a peripheral groove with radially outer end edges that extend further in the bottle axis direction from the bottom surface toward adjacent corner surface portions, alleviating stress concentration at the ridge line portion, and features a bottom surface with alternating linear and curved portions that protrude to overlap with the ridge line, distributing stress effectively.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a conventional square bottle design is used, then the manufacturing process is simple, but the body portion deforms improperly during pressure reduction after heat filling

Engineering Contradiction:

Improveshape stability during pressure reductionVSAvoidperipheral groove structure complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The peripheral groove is designed with non-uniform characteristics: the side surfaces have different extension lengths in the bottle axis direction at different circumferential positions. Specifically, the radially outer end edges of the side surfaces are positioned at different distances from the bottom surface, creating local variations in groove depth that correspond to different structural requirements at panel surface portions versus corner surface portions.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The body portion is segmented into panel surface portions and corner surface portions, with the peripheral groove accommodating different geometric configurations for each segment. The groove structure is divided into multiple side surfaces (upper and lower) that can be independently configured, allowing differentiated stress management for different segments of the bottle body.

Inventive Principle:

Principle #1Segmentation

2Stress or pressure

If the peripheral groove has uniform depth, then the manufacturing is easier, but stress concentration at ridge line portions cannot be effectively alleviated

Engineering Contradiction:

Improvestress distribution at ridge line portionVSAvoidperipheral groove geometry precision

Core Design Contradiction:

Stress or pressureVSManufacturing precision

Solution Approach 1:

The peripheral groove is designed with non-uniform characteristics: the side surfaces have different extension lengths in the bottle axis direction at different circumferential positions. Specifically, the radially outer end edges of the side surfaces are positioned at different distances from the bottom surface, creating local variations in groove depth that correspond to different structural requirements at panel surface portions versus corner surface portions.

Inventive Principle:

Principle #3Local quality

3Reliability

If the bottle body is made robust to prevent deformation, then the shape stability improves, but the bottle weight increases

Engineering Contradiction:

Improveresistance to deformation during pressure reductionVSAvoidbottle weight

Core Design Contradiction:

ReliabilityVSWeight of moving object

Solution Approach 1:

The body portion is segmented into panel surface portions and corner surface portions, with the peripheral groove accommodating different geometric configurations for each segment. The groove structure is divided into multiple side surfaces (upper and lower) that can be independently configured, allowing differentiated stress management for different segments of the bottle body.

Inventive Principle:

Principle #1Segmentation

Data Source

PatentUS11130608B2Square bottle

Publication Date: 2021.09.28 YOSHINO KOGYOSHO CO LTD

AI summary

A peripheral groove is defined by a bottom surface, an upper side surface, and a lower side surface, and, in at least one of the upper side surface and the lower side surface, a radially outer end edge of an end portion positioned at a circumferential end portion of a panel surface portion is further away in a bottle axis direction from the bottom surface toward an adjacent corner surface portion when viewed from the outside in the radial direction.