V-Shaped Groove Design for Thermoformed Plastic Food Containers
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Solution Overview
Problem
Thermoformed plastic containers used for packaging food products face challenges in structural reinforcement due to thin material thickness, leading to deformability under stacking conditions, and require numerous grooves for adequate strength, which complicates manufacturing, increases costs, and reduces transparency.
Innovation Solution
The use of V-shaped grooves on the base and cover of the container, which are tapered to converge at a vertex, provides structural reinforcement with a reduced number of grooves, enhancing bending and compression strength while maintaining transparency and simplifying production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If numerous grooves are added to reinforce the container structure, then the structural strength is improved, but the manufacturing complexity and production costs increase
Solution Approach 1:
The invention changes the geometric parameters of the grooves by making them V-shaped with specific angle ranges (30-60 degrees for the opening angle). This parameter optimization allows the grooves to provide maximum structural reinforcement with minimal material removal, reducing the number of grooves needed while maintaining strength and simplifying manufacturing.
Solution Approach 2:
The V-shaped grooves are strategically positioned at critical locations where structural reinforcement is most needed, such as corners and edges of the container base and cover. This localized reinforcement approach provides effective strength enhancement without requiring numerous grooves throughout the entire structure, thereby reducing manufacturing complexity.
2Strength
If numerous grooves are added to reinforce the container structure, then the structural strength is improved, but the transparency and visibility of the container content deteriorate
Solution Approach 1:
By optimizing the V-shaped groove parameters including the opening angle (30-60 degrees) and depth, the invention achieves maximum structural reinforcement with minimal impact on light transmission. The optimized geometry allows light to pass through with less distortion compared to traditional round or square grooves, thereby maintaining container transparency while providing necessary strength.
Solution Approach 2:
The grooves are concentrated at specific critical locations rather than distributed uniformly across the entire container surface. This localized placement provides structural reinforcement where most needed while leaving large continuous transparent areas for displaying the container content, thus resolving the contradiction between strength and transparency.
3Loss of substance
If the sheet thickness is reduced to lower production costs and weight, then the material consumption is reduced, but the structural strength and resistance to deformation deteriorate
Solution Approach 1:
The V-shaped groove geometry with optimized opening angles and depth ratios compensates for the reduced sheet thickness by creating more efficient stress distribution patterns. The tapered V-shape provides better mechanical reinforcement per unit of material removed compared to conventional groove shapes, allowing thin-walled containers to achieve adequate structural strength with minimal material consumption.
Solution Approach 2:
The reinforcement grooves are strategically placed at critical stress concentration points in the thin-walled structure, such as corners and edges, where they provide maximum structural benefit. This localized reinforcement approach allows the use of thinner material in non-critical areas while maintaining overall structural integrity, thereby reducing total material consumption without sacrificing strength.
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 container achieves improved mechanical strength with fewer reinforcing grooves, reducing the risk of structural failure and maintaining visibility of the content, thus being more suitable for stacking and display without compromising aesthetic appeal or increasing production complexity.
Implementation Method 1
V-shaped grooves (26) substantially converging in a vertex (V) at one of their ends, made on the closing cover (3) of a container (1, 60) made of plastic material for packaging foodstuffs
Data Source
Figure 1~2
Figure 3
Figure 4~5
AI summary
A container (1) made of plastic material for packaging food products or foodstuffs is described, comprising a base (2) having a bottom (4) and side walls (5, 6) ending at the top with a peripheral edge (7) and at least one groove (8) formed on said bottom (4) and/or on at least one of said side walls (5, 6), the container being characterized in that said at least one groove (8) is substantially V-shaped (or triangle-shaped) in cross section and it is tapered from an end thereof until it substantially converges in a vertex (V) at the opposite end.