Plastic Bottle Shoulder Design for Top Loading Resistance
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Solution Overview
Problem
Conventional plastic bottles have insufficient top loading resistance, leading to buckling or collapse when stacked, resulting in economic losses and potential damage, especially when filled with heavier liquids.
Innovation Solution
The implementation of bottles with variable wall thickness and specific shoulder angles, along with structural features like surface grooves and ribs, enhances top loading resistance without increasing material usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional plastic bottles are used with uniform wall thickness, then material usage is minimized, but top loading resistance is insufficient leading to buckling or collapse
Solution Approach 1:
The patent applies local quality by creating variable wall thickness distribution in the bottle structure. Specifically, the shoulder region is designed with increased wall thickness (up to 4 times thicker than other regions) to locally enhance strength and resist top loading forces, while the rest of the bottle maintains thinner walls to minimize overall material usage. This selective thickening addresses the contradiction by providing structural reinforcement exactly where needed rather than uniformly throughout the entire bottle.
Solution Approach 2:
The patent introduces a new dimension to the bottle design by incorporating a specific shoulder angle (α) in addition to variable wall thickness. This angular geometry creates a structural configuration that efficiently distributes top loading forces across the shoulder region. The combination of thickness variation and angular positioning creates a three-dimensional structural solution that improves top loading resistance without proportionally increasing material usage.
2Strength
If additional structural features such as sidewall ribs and panels are added, then top loading resistance is improved, but material usage and manufacturing complexity increase
Solution Approach 1:
Instead of adding multiple discrete structural features throughout the bottle, the patent concentrates the strengthening effort in the shoulder region through localized wall thickening and specific angular geometry. This approach improves top loading resistance by focusing structural enhancement where the forces are applied, rather than distributing complexity across the entire bottle structure.
Solution Approach 2:
The patent modifies fundamental geometric parameters of the bottle - specifically the shoulder angle (α) and wall thickness distribution - rather than adding auxiliary structural elements. By changing these base parameters, the design achieves improved top loading resistance through the bottle's inherent geometry and material distribution, avoiding the need for additional ribs, panels, or other complex structural additions.
3Strength
If gradual thickening of the sidewall upwardly toward the shoulder and neck portions is implemented, then bottle strength against laterally imposed stacking loads is improved, but the effectiveness against top loading forces remains uncertain
Solution Approach 1:
The patent refines the gradual thickening approach by specifically targeting the shoulder region with concentrated wall thickening (up to 4 times thicker than other regions). This localized enhancement in the shoulder area directly addresses top loading forces while maintaining the benefits of gradual thickening for lateral stacking loads. The specific positioning of the thickened region resolves the uncertainty about effectiveness against top loading.
Solution Approach 2:
The patent introduces asymmetry in the wall thickness distribution by creating a distinct thickened shoulder region that differs from the rest of the bottle structure. This asymmetric thickening pattern - with the maximum thickness concentrated at the shoulder rather than uniformly distributed - optimizes the structure for resisting top loading forces while maintaining adequate strength for lateral stacking loads.
Data Source
AI summary
This disclosure is generally directed toward bottles with improved top loading resistance and does so by, among other things, utilizing walls, shoulder, and/or other structural features of a particular size, taper, angle, and/or material. The bottle includes a mouth, a barrel connected to a base, and a shoulder extending between the mouth and barrel. The shoulder may include upper, intermediate, and lower sections, in which the intermediate section may be relatively thicker than the upper section. The barrel may also include upper, intermediate, and lower sections, in which the intermediate section may be relatively thicker than the lower section.