Petaloid Base Ribs for Plastic Container Crease Prevention
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Solution Overview
Problem
Petaloid bottoms in plastic containers, used to provide mechanical rigidity and stability, are prone to undesirable deformations such as creases, especially when lightweight and subjected to internal pressure and compressive stresses during palletization, which can lead to incipient fractures.
Innovation Solution
Incorporating ribs on the petaloid bottom's projecting feet, which extend radially and are connected to the outer wall by a fillet, to absorb and channel deformations induced by the container's pressure, thereby preventing crease formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If the container is lightweight (reduced material quantity and thickness), then material usage and weight are reduced, but the container becomes more prone to uncontrolled deformations and creases on the feet
Solution Approach 1:
The patent applies local reinforcement by adding ribs specifically to the feet regions of the petaloid bottom, rather than uniformly thickening the entire container. This localized structural enhancement provides targeted support where deformations occur most frequently, maintaining overall container lightness while preventing creases and uncontrolled deformations on the feet during palletization and storage.
2Reliability
If ribs are added to the feet, then resistance to deformation is increased, but device complexity increases
Solution Approach 1:
The reinforcement structure is segmented into discrete ribs positioned on each foot, rather than creating a complex continuous reinforcement pattern. This segmentation allows for simpler manufacturing through standard blow molding processes while effectively distributing the reinforcement function across multiple simple structural elements.
Solution Approach 2:
The ribs are designed with curved, arcuate geometries that follow the natural contours of the petaloid bottom feet. This curvature allows the ribs to efficiently distribute stresses along curved paths, providing enhanced deformation resistance while maintaining compatibility with the blow molding manufacturing process and avoiding complex angular or straight-line geometries.
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 ribs effectively minimize or eliminate uncontrolled deformations of the feet, maintaining the container's shape and stability under load, while maintaining aesthetics and increasing resistance, even when the container is lightweight.
Implementation Method 1
absorb part of the deformations induced in the foot which are thus channeled, which avoids the formation of undesirable creases
Data Source
Figure 1~3
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AI summary
The invention relates to a plastics container obtained by blow moulding or stretch blow moulding from a blank, this container comprising a body, a neck which extends at an upper end of the body and a petaloid base (4) which extends at a lower end of the body, this petaloid base (4) being provided with protruding feet (5) that are separated by recessed valleys (6) that extend radially from a central region (7) of the base (4), each foot (5) having an external wall (10) which extends in continuation of the body (2) and two side walls (11) that each border a valley (6) and are each connected to the external wall (10) by a fillet (12), each foot (5) being provided with at least one rib (14), a lateral portion (15) of which overlaps said fillet (12).