Composite Shipping Container Structure for High Compression Strength
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Solution Overview
Problem
Existing shipping containers are heavy, prone to rapid deterioration, and suboptimal for transporting sensitive perishable goods due to environmental conditions, with a need for improved mechanical properties and sustainable production methods.
Innovation Solution
A shipping container made of a multilayer composite comprising a core layer with elongated foamed elements arranged in a specific orientation, bonded to cover layers of polypropylene, which enhances compression strength and recyclability without adhesives.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If traditional shipping containers are made of heavy materials to ensure structural strength, then compression strength is improved, but weight increases and recyclability deteriorates
Solution Approach 1:
The patent applies composite materials by combining polypropylene cover layers with a foamed core layer containing elongated foamed elements. This composite structure achieves high compression strength through the oriented foam elements while maintaining low density, resolving the contradiction between strength and weight. The multilayer composite design allows each layer to contribute specific properties: the cover layers provide structural integrity while the foamed core provides lightweight insulation and compression resistance.
Solution Approach 2:
The patent implements local quality by orienting elongated foamed elements in specific directions within the core layer to optimize compression strength in the thickness direction. The foam elements are arranged with their longitudinal axes substantially perpendicular to the cover layers, creating localized density and strength variations where needed. This directional arrangement provides enhanced compression resistance at the core-covers interface while keeping overall weight low.
2Reliability
If shipping containers use conventional materials and construction methods, then structural integrity is maintained, but durability against environmental deterioration improves poorly
Solution Approach 1:
The patent applies parameter changes by modifying the physical and chemical properties of the container materials. The polypropylene cover layers provide resistance to moisture and corrosion, while the foamed core layer with controlled density and cell structure offers thermal insulation and dimensional stability. These parameter optimizations enhance durability against environmental deterioration including humidity, temperature variations, and mechanical stress, thereby extending service life.
3Ease of manufacture
If manual production methods are used for sandwich panels, then manufacturing flexibility is maintained, but production efficiency and sustainability deteriorate
Solution Approach 1:
The patent implements segmentation by dividing the sandwich panel into distinct functional layers: polypropylene cover layers and a foamed core layer with elongated elements. This segmentation allows each component to be manufactured separately using optimized processes, then assembled into the final structure. The modular design enables automated production while maintaining the ability to adjust individual layer properties for different applications, thus improving both efficiency and flexibility.
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 multilayer composite provides high compression strength, especially in the thickness direction, while maintaining low density and facilitating easier, more sustainable production, with improved recyclability and reduced material usage.
Implementation Method 1
the at least one foamed sheet having been prepared by a foamed extrusion process
Implementation Method 2
a foamed sheet comprising a polymer composition comprising polypropylene
Implementation Method 3
bonded to one another at abutting side faces thereof
Implementation Method 4
a multilayer composite comprising a core layer and a first cover layer provided on the core layer
Data Source
AI summary
A shipping container including a multilayer composite including a core layer including an assembly and a first cover layer provided on the core layer, wherein the first cover layer includes a first composition having a density of at least 0.903 g/cm3 and including polypropylene and optionally reinforcement fibers such as glass fibers wherein the assembly includes a plurality of elongated foamed elements that are arranged next to one another in one plane and bonded to one another at abutting side faces thereof, wherein the elongated foamed elements have been made by cutting at least one foamed sheet having a top surface and a bottom surface, the at least one foamed sheet having been prepared by a foamed extrusion process and the foamed sheet includes a polymer composition including polypropylene, wherein the cutting is perpendicular to the top surface and the bottom surface of the at least one foamed sheet.