Perforated Foam Core Composite Panel for Trailer Sidewalls

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Solution Overview

Problem

Existing composite panels for storage containers, such as truck trailers, face challenges in achieving optimal weight reduction and strength-to-weight ratio while maintaining effective bonding of metal sheets to the core.

Innovation Solution

The use of a perforated foam core composite panel design, where a foamed thermal plastic core with strategically arranged apertures is sandwiched between inner and outer metal sheets, enhances weight reduction and strength while allowing for continuous formation along a single production line.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Strength

If a solid foam core is used in composite panels, then bonding strength between metal sheets and core is improved, but weight of the panel increases

Engineering Contradiction:

Improvebonding strengthVSAvoidpanel weight

Core Design Contradiction:

StrengthVSWeight of moving object

Solution Approach 1:

The patent applies porous materials by using a foam core with controlled cellular structure. The foam core provides sufficient bonding strength through its porous surface area while maintaining weight reduction through its cellular interior structure, resolving the contradiction between bonding strength and weight.

Inventive Principle:

Principle #31Porous materials

Solution Approach 2:

The patent uses composite materials by combining metal sheets with a foam core material. This composite structure allows the metal sheets to provide surface strength and bonding areas while the foam core provides lightweight structural support, achieving both strong bonding and weight reduction.

Inventive Principle:

Principle #40Composite materials

2Weight of moving object

If apertures are formed through the foam core, then weight reduction is achieved, but bonding strength between metal sheets and core deteriorates

Engineering Contradiction:

Improvepanel weightVSAvoidbonding strength

Core Design Contradiction:

Weight of moving objectVSStrength

Solution Approach 1:

The patent applies local quality by creating regions of different properties within the foam core. The areas around aperture edges maintain higher density and strength for bonding, while the interior cellular structure remains lightweight. This local differentiation allows weight reduction through apertures while preserving bonding strength at critical interfaces.

Inventive Principle:

Principle #3Local quality

3Manufacturing precision

If multiple discrete operations are used for panel formation, then manufacturing precision is improved, but productivity decreases

Engineering Contradiction:

Improvepanel formation precisionVSAvoidproduction speed

Core Design Contradiction:

Manufacturing precisionVSProductivity

Solution Approach 1:

The patent merges multiple discrete manufacturing operations into a single integrated forming process. The composite panel is formed in one continuous operation that simultaneously creates the metal sheet assembly and foam core structure, maintaining precision while dramatically improving productivity by eliminating multiple handling and positioning steps.

Inventive Principle:

Principle #5Merging (Combining)

4Strength

If a continuous laminate panel is used for sidewalls, then structural strength is improved, but manufacturing complexity increases

Engineering Contradiction:

Improvesidewall strengthVSAvoidmanufacturing complexity

Core Design Contradiction:

StrengthVSDevice complexity

Solution Approach 1:

The patent applies self-service by designing a forming process that automatically creates the continuous laminate structure through its own operation sequence. The single forming operation inherently produces the continuous panel structure without requiring additional assembly steps or complex manufacturing equipment, reducing manufacturing complexity while maintaining structural strength.

Inventive Principle:

Principle #25Self-service

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

This design achieves significant weight reduction and improved strength-to-weight ratio, enabling more efficient and cost-effective manufacturing of composite panels for storage containers.

Implementation Method 1

forming a hot thermal plastic sheet of material

Methodology Applied

Scientific EffectThermal heating: Heating

Implementation Method 2

displacing slugs of material from the hot thermal plastic sheet of material via the punch members

Methodology Applied

Scientific EffectMechanical displacement: Mechanical Force

Implementation Method 3

coupling an outer metal sheet and an inner metal sheet to opposite surfaces of the hot thermal plastic sheet of material

Methodology Applied

Scientific EffectThermal bonding: Heating

Data Source

PatentUS12325470B2Composite panel having perforated foam core and method of making the same

Publication Date: 2025.06.10 WABASH NATIONAL CORP

AI summary

A panel for a trailer and a method of making the same is provided. The trailer includes a front wall, a rear wall opposite the front wall, a first sidewall, and a second sidewall. The first sidewall is formed by a first continuous laminate panel that extends an entire length of the first sidewall, and the second sidewall is formed by a second continuous laminate panel that extends an entire length of the second sidewall. The first continuous laminate panel and the second continuous laminate panel each comprise a first skin, a second skin opposite the first skin, and a perforated core between the first skin and the second skin.